From 8fcc2958f3d23ab303e55ffc1c347a0cdea6514a Mon Sep 17 00:00:00 2001
From: Olmo del Corral Cano <olmo.delcorralcano@bechtle.com>
Date: Fri, 4 Jan 2019 17:26:59 +0100
Subject: [PATCH 01/25] initial NotNull reference types

---
 Signum.Utilities/ConsoleSwitch.cs             |  8 +-
 Signum.Utilities/Csv.cs                       | 76 +++++++++----------
 .../DataStructures/DirectedEdgedGraph.cs      |  2 +-
 .../DataStructures/LambdaComparer.cs          | 12 +--
 .../Extensions/DictionaryExtensions.cs        |  4 +-
 .../Extensions/StringExtensions.cs            | 50 ++++++------
 Signum.Utilities/Signum.Utilities.csproj      |  4 +-
 Signum.Utilities/StringDistance.cs            | 26 +++----
 Signum.Utilities/Synchronization/ResetLazy.cs | 14 ++--
 Signum.Utilities/Tsv.cs                       | 34 ++++-----
 10 files changed, 118 insertions(+), 112 deletions(-)

diff --git a/Signum.Utilities/ConsoleSwitch.cs b/Signum.Utilities/ConsoleSwitch.cs
index 221033eb15..9187b68573 100644
--- a/Signum.Utilities/ConsoleSwitch.cs
+++ b/Signum.Utilities/ConsoleSwitch.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.ComponentModel;
@@ -274,21 +274,21 @@ static string DefaultDescription(object value)
 
     public static class ConsoleSwitchExtensions
     {
-        public static T ChooseConsole<T>(this IEnumerable<T> collection, Func<T, string> getString = null, string message = null) where T : class        {
+        public static T ChooseConsole<T>(this IEnumerable<T> collection, Func<T, string>? getString = null, string? message = null) where T : class        {
       
             var cs = new ConsoleSwitch<int, T>(message ?? ConsoleMessage.SelectOneOfTheFollowingOptions.NiceToString());
             cs.Load(collection.ToList(), getString);
             return cs.Choose();
         }
 
-        public static T[] ChooseConsoleMultiple<T>(this IEnumerable<T> collection, Func<T, string> getString = null, string message = null) where T : class
+        public static T[] ChooseConsoleMultiple<T>(this IEnumerable<T> collection, Func<T, string>? getString = null, string? message = null) where T : class
         {
             var cs = new ConsoleSwitch<int, T>(message ?? ConsoleMessage.SelectOneOfTheFollowingOptions.NiceToString());
             cs.Load(collection.ToList(), getString);
             return cs.ChooseMultiple();
         }
 
-        public static ConsoleSwitch<int, T> Load<T>(this ConsoleSwitch<int, T> cs, List<T> collection, Func<T, string> getString = null) where T : class
+        public static ConsoleSwitch<int, T> Load<T>(this ConsoleSwitch<int, T> cs, List<T> collection, Func<T, string>? getString = null) where T : class
         {
             for (int i = 0; i < collection.Count; i++)
             {
diff --git a/Signum.Utilities/Csv.cs b/Signum.Utilities/Csv.cs
index debae5de99..0d5df85240 100644
--- a/Signum.Utilities/Csv.cs
+++ b/Signum.Utilities/Csv.cs
@@ -20,8 +20,8 @@ public static class Csv
 
         public static CultureInfo DefaultCulture = null;
 
-        public static string ToCsvFile<T>(this IEnumerable<T> collection, string fileName, Encoding encoding = null, CultureInfo culture = null, bool writeHeaders = true, bool autoFlush = false, bool append = false,
-            Func<CsvColumnInfo<T>, CultureInfo, Func<object, string>> toStringFactory = null)
+        public static string ToCsvFile<T>(this IEnumerable<T> collection, string fileName, Encoding? encoding = null, CultureInfo? culture = null, bool writeHeaders = true, bool autoFlush = false, bool append = false,
+            Func<CsvColumnInfo<T>, CultureInfo, Func<object, string>>? toStringFactory = null)
         {
             using (FileStream fs = append ? new FileStream(fileName, FileMode.Append, FileAccess.Write) : File.Create(fileName))
                 ToCsv<T>(collection, fs, encoding, culture, writeHeaders, autoFlush, toStringFactory);
@@ -29,8 +29,8 @@ public static string ToCsvFile<T>(this IEnumerable<T> collection, string fileNam
             return fileName;
         }
 
-        public static byte[] ToCsvBytes<T>(this IEnumerable<T> collection, Encoding encoding = null, CultureInfo culture = null, bool writeHeaders = true, bool autoFlush = false,
-            Func<CsvColumnInfo<T>, CultureInfo, Func<object, string>> toStringFactory = null)
+        public static byte[] ToCsvBytes<T>(this IEnumerable<T> collection, Encoding? encoding = null, CultureInfo? culture = null, bool writeHeaders = true, bool autoFlush = false,
+            Func<CsvColumnInfo<T>, CultureInfo, Func<object, string>>? toStringFactory = null)
         {
             using (MemoryStream ms = new MemoryStream())
             {
@@ -39,32 +39,33 @@ public static byte[] ToCsvBytes<T>(this IEnumerable<T> collection, Encoding enco
             }
         }
 
-        public static void ToCsv<T>(this IEnumerable<T> collection, Stream stream, Encoding encoding = null, CultureInfo culture = null, bool writeHeaders = true, bool autoFlush = false,
-            Func<CsvColumnInfo<T>, CultureInfo, Func<object, string>> toStringFactory = null)
+        public static void ToCsv<T>(this IEnumerable<T> collection, Stream stream, Encoding? encoding = null, CultureInfo? culture = null, bool writeHeaders = true, bool autoFlush = false,
+            Func<CsvColumnInfo<T>, CultureInfo, Func<object, string>>? toStringFactory = null)
         {
-            encoding = encoding ?? DefaultEncoding;
-            culture = culture ?? DefaultCulture ?? CultureInfo.CurrentCulture;
+            var defEncoding = encoding ?? DefaultEncoding;
+            var defCulture = culture ?? DefaultCulture ?? CultureInfo.CurrentCulture;
 
-            string separator = culture.TextInfo.ListSeparator;
+            string separator = defCulture.TextInfo.ListSeparator;
 
             if (typeof(IList).IsAssignableFrom(typeof(T)))
             {
-                using (StreamWriter sw = new StreamWriter(stream, encoding) { AutoFlush = autoFlush })
+                using (StreamWriter sw = new StreamWriter(stream, defEncoding) { AutoFlush = autoFlush })
                 {
-                    foreach (IList row in collection)
+                    foreach (IList? row in collection)
                     {
-                        for (int i = 0; i < row.Count; i++)
+                        for (int i = 0; i < row!.Count; i++)
                         {
-                            var obj = row[i];
+                            var obj = row![i];
 
-                            var str = EncodeCsv(ConvertToString(obj, null, culture), culture);
+                            var str = EncodeCsv(ConvertToString(obj, null, defCulture), defCulture);
 
                             sw.Write(str);
-                            if (i < row.Count - 1)
+                            if (i < row!.Count - 1)
                                 sw.Write(separator);
                             else
                                 sw.WriteLine();
                         }
+
                     }
                 }
             }
@@ -72,7 +73,7 @@ public static void ToCsv<T>(this IEnumerable<T> collection, Stream stream, Encod
             {
                 var columns = ColumnInfoCache<T>.Columns;
                 var members = columns.Select(c => c.MemberEntry).ToList();
-                var toString = columns.Select(c => GetToString(culture, c, toStringFactory)).ToList();
+                var toString = columns.Select(c => GetToString(defCulture, c, toStringFactory)).ToList();
 
                 using (StreamWriter sw = new StreamWriter(stream, encoding) { AutoFlush = autoFlush })
                 {
@@ -85,7 +86,7 @@ public static void ToCsv<T>(this IEnumerable<T> collection, Stream stream, Encod
                         {
                             var obj = members[i].Getter(item);
 
-                            var str = EncodeCsv(toString[i](obj), culture);
+                            var str = EncodeCsv(toString[i](obj), defCulture);
 
                             sw.Write(str);
                             if (i < members.Count - 1)
@@ -99,7 +100,7 @@ public static void ToCsv<T>(this IEnumerable<T> collection, Stream stream, Encod
         }
 
 
-        static string EncodeCsv(string p, CultureInfo culture)
+        static string? EncodeCsv(string p, CultureInfo culture)
         {
             if (p == null)
                 return null;
@@ -113,7 +114,7 @@ static string EncodeCsv(string p, CultureInfo culture)
             return p;
         }
 
-        private static Func<object, string> GetToString<T>(CultureInfo culture, CsvColumnInfo<T> column, Func<CsvColumnInfo<T>, CultureInfo, Func<object, string>> toStringFactory)
+        private static Func<object, string> GetToString<T>(CultureInfo culture, CsvColumnInfo<T> column, Func<CsvColumnInfo<T>, CultureInfo, Func<object, string>>? toStringFactory)
         {
             if (toStringFactory != null)
             {
@@ -126,15 +127,15 @@ private static Func<object, string> GetToString<T>(CultureInfo culture, CsvColum
             return obj => ConvertToString(obj, column.Format, culture);
         }
 
-        static string ConvertToString(object obj, string format, CultureInfo culture)
+        static string ConvertToString(object obj, string? format, CultureInfo culture)
         {
             if (obj == null)
                 return "";
 
             if (obj is IFormattable f)
-                return f.ToString(null, culture);
+                return f.ToString(format, culture);
             else
-                return obj.ToString();
+                return obj!.ToString();
         }
 
         static string HandleSpaces(string p)
@@ -142,7 +143,7 @@ static string HandleSpaces(string p)
             return p.Replace("__", "^").Replace("_", " ").Replace("^", "_");
         }
 
-        public static List<T> ReadFile<T>(string fileName, Encoding encoding = null, CultureInfo culture = null, int skipLines = 1, CsvReadOptions<T> options = null) where T : class, new()
+        public static List<T> ReadFile<T>(string fileName, Encoding? encoding = null, CultureInfo? culture = null, int skipLines = 1, CsvReadOptions<T>? options = null) where T : class, new()
         {
             encoding = encoding ?? DefaultEncoding;
             culture = culture ?? DefaultCulture ?? CultureInfo.CurrentCulture;
@@ -151,26 +152,25 @@ static string HandleSpaces(string p)
                 return ReadStream<T>(fs, encoding, culture, skipLines, options).ToList();
         }
 
-        public static List<T> ReadBytes<T>(byte[] data, Encoding encoding = null, CultureInfo culture = null, int skipLines = 1, CsvReadOptions<T> options = null) where T : class, new()
+        public static List<T> ReadBytes<T>(byte[] data, Encoding? encoding = null, CultureInfo? culture = null, int skipLines = 1, CsvReadOptions<T>? options = null) where T : class, new()
         {
             using (MemoryStream ms = new MemoryStream(data))
                 return ReadStream<T>(ms, encoding, culture, skipLines, options).ToList();
         }
 
-        public static IEnumerable<T> ReadStream<T>(Stream stream, Encoding encoding = null, CultureInfo culture = null, int skipLines = 1, CsvReadOptions<T> options = null) where T : class, new()
+        public static IEnumerable<T> ReadStream<T>(Stream stream, Encoding? encoding = null, CultureInfo? culture = null, int skipLines = 1, CsvReadOptions<T>? options = null) where T : class, new()
         {
             encoding = encoding ?? DefaultEncoding;
-            culture = culture ?? DefaultCulture ?? CultureInfo.CurrentCulture;
-            if (options == null)
-                options = new CsvReadOptions<T>();
+            var defCulture = culture ?? DefaultCulture ?? CultureInfo.CurrentCulture;
+            var defOptions = options ?? new CsvReadOptions<T>();
 
             var columns = ColumnInfoCache<T>.Columns;
             var members = columns.Select(c => c.MemberEntry).ToList();
-            var parsers = columns.Select(c => GetParser(culture, c, options.ParserFactory)).ToList();
+            var parsers = columns.Select(c => GetParser(defCulture, c, defOptions.ParserFactory)).ToList();
 
-            Regex regex = GetRegex(culture, options.RegexTimeout);
+            Regex regex = GetRegex(defCulture, defOptions.RegexTimeout);
 
-            if (options.AsumeSingleLine)
+            if (defOptions.AsumeSingleLine)
             {
                 using (StreamReader sr = new StreamReader(stream, encoding))
                 {
@@ -185,8 +185,8 @@ static string HandleSpaces(string p)
                         if (csvLine == null)
                             yield break;
 
-                        Match m = null;
-                        T t = null;
+                        Match? m = null;
+                        T? t = null;
                         try
                         {
                             m = regex.Match(csvLine);
@@ -199,7 +199,7 @@ static string HandleSpaces(string p)
                         {
                             e.Data["row"] = line;
 
-                            if (options.SkipError == null || !options.SkipError(e, m))
+                            if (defOptions.SkipError == null || !defOptions.SkipError(e, m))
                                 throw new ParseCsvException(e);
                         }
 
@@ -224,7 +224,7 @@ static string HandleSpaces(string p)
                     {
                         if (m.Length > 0)
                         {
-                            T t = null;
+                            T? t = null;
                             try
                             {
                                 t = ReadObject<T>(m, members, parsers);
@@ -233,7 +233,7 @@ static string HandleSpaces(string p)
                             {
                                 e.Data["row"] = line;
 
-                                if (options.SkipError == null || !options.SkipError(e, m))
+                                if (defOptions.SkipError == null || !defOptions.SkipError(e, m))
                                     throw new ParseCsvException(e);
                             }
                             if (t != null)
@@ -245,7 +245,7 @@ static string HandleSpaces(string p)
             }
         }
 
-        public static T ReadLine<T>(string csvLine, CultureInfo culture = null, CsvReadOptions<T> options = null)
+        public static T ReadLine<T>(string csvLine, CultureInfo? culture = null, CsvReadOptions<T> options = null)
             where T : class, new()
         {
             if (options == null)
@@ -264,7 +264,7 @@ public static T ReadLine<T>(string csvLine, CultureInfo culture = null, CsvReadO
                 columns.Select(c => GetParser(culture, c, options.ParserFactory)).ToList());
         }
 
-        private static Func<string, object> GetParser<T>(CultureInfo culture, CsvColumnInfo<T> column, Func<CsvColumnInfo<T>, CultureInfo, Func<string, object>> parserFactory)
+        private static Func<string, object> GetParser<T>(CultureInfo culture, CsvColumnInfo<T> column, Func<CsvColumnInfo<T>, CultureInfo, Func<string, object>>? parserFactory)
         {
             if (parserFactory != null)
             {
diff --git a/Signum.Utilities/DataStructures/DirectedEdgedGraph.cs b/Signum.Utilities/DataStructures/DirectedEdgedGraph.cs
index 3796f3f343..2502f1956b 100644
--- a/Signum.Utilities/DataStructures/DirectedEdgedGraph.cs
+++ b/Signum.Utilities/DataStructures/DirectedEdgedGraph.cs
@@ -388,7 +388,7 @@ public XDocument ToDGML()
                 e => e.ToString() ?? "[null]");
         }
 
-        public XDocument ToDGML(Func<T, string> getNodeLabel, Func<T, string> getColor, Func<E, string> getEdgeLabel = null)
+        public XDocument ToDGML(Func<T, string> getNodeLabel, Func<T, string> getColor, Func<E, string>? getEdgeLabel = null)
         {
             return ToDGML(n => new[]
             {
diff --git a/Signum.Utilities/DataStructures/LambdaComparer.cs b/Signum.Utilities/DataStructures/LambdaComparer.cs
index 21b77e1173..751f63fb70 100644
--- a/Signum.Utilities/DataStructures/LambdaComparer.cs
+++ b/Signum.Utilities/DataStructures/LambdaComparer.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Collections;
 
@@ -7,8 +7,8 @@ namespace Signum.Utilities.DataStructures
     public class LambdaComparer<T, S> : IComparer<T>, IEqualityComparer<T>, IComparer, IEqualityComparer
     {
         readonly Func<T, S> func;
-        readonly IComparer<S> comparer = null;
-        readonly IEqualityComparer<S> equalityComparer = null;
+        readonly IComparer<S> comparer;
+        readonly IEqualityComparer<S> equalityComparer;
 
         int descending = 1;
         public bool Descending
@@ -17,7 +17,7 @@ public bool Descending
             set { descending = value ? -1 : 1; }
         }
 
-        public LambdaComparer(Func<T, S> func, IEqualityComparer<S> equalityComparer = null, IComparer<S> comparer = null)
+        public LambdaComparer(Func<T, S> func, IEqualityComparer<S>? equalityComparer = null, IComparer<S>? comparer = null)
         {
             if (func == null)
                 throw new ArgumentNullException("func");
@@ -60,12 +60,12 @@ bool IEqualityComparer.Equals(object x, object y)
 
     public static class LambdaComparer
     {
-        public static LambdaComparer<T, S> By<T, S>(Func<T, S> func, IEqualityComparer<S> equalityComparer = null, IComparer<S> comparer = null)
+        public static LambdaComparer<T, S> By<T, S>(Func<T, S> func, IEqualityComparer<S>? equalityComparer = null, IComparer<S>? comparer = null)
         {
             return new LambdaComparer<T, S>(func, equalityComparer, comparer);
         }
 
-        public static LambdaComparer<T, S> ByDescending<T, S>(Func<T, S> func, IEqualityComparer<S> equalityComparer = null, IComparer<S> comparer = null)
+        public static LambdaComparer<T, S> ByDescending<T, S>(Func<T, S> func, IEqualityComparer<S>? equalityComparer = null, IComparer<S>? comparer = null)
         {
             return new LambdaComparer<T, S>(func, equalityComparer, comparer) { Descending = true };
         }
diff --git a/Signum.Utilities/Extensions/DictionaryExtensions.cs b/Signum.Utilities/Extensions/DictionaryExtensions.cs
index 5f496e3bfb..2e0759a7cd 100644
--- a/Signum.Utilities/Extensions/DictionaryExtensions.cs
+++ b/Signum.Utilities/Extensions/DictionaryExtensions.cs
@@ -1,4 +1,4 @@
-using Signum.Utilities.ExpressionTrees;
+using Signum.Utilities.ExpressionTrees;
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
@@ -16,7 +16,7 @@ public static V TryGet<K, V>(this IReadOnlyDictionary<K, V> dictionary, K key, V
             return defaultValue;
         }
 
-        public static V TryGetC<K, V>(this IReadOnlyDictionary<K, V> dictionary, K key) where V : class
+        public static V? TryGetC<K, V>(this IReadOnlyDictionary<K, V> dictionary, K key) where V : class
         {
             if (dictionary.TryGetValue(key, out V result))
                 return result;
diff --git a/Signum.Utilities/Extensions/StringExtensions.cs b/Signum.Utilities/Extensions/StringExtensions.cs
index 3176f5805d..3a448a1a02 100644
--- a/Signum.Utilities/Extensions/StringExtensions.cs
+++ b/Signum.Utilities/Extensions/StringExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
@@ -147,7 +147,7 @@ public static string After(this string str, string separator)
         /// <param name="str"></param>
         /// <param name="separator"></param>
         /// <returns>the substring before the first occurence of the separator or null if not found</returns>
-        public static string TryBefore(this string str, char separator)
+        public static string? TryBefore(this string? str, char separator)
         {
             if (str == null)
                 return null;
@@ -166,7 +166,7 @@ public static string TryBefore(this string str, char separator)
         /// <param name="str"></param>
         /// <param name="separator"></param>
         /// <returns>the substring before the first occurence of the separator or null if not found</returns>
-        public static string TryBefore(this string str, string separator)
+        public static string? TryBefore(this string? str, string separator)
         {
             if (str == null)
                 return null;
@@ -184,7 +184,7 @@ public static string TryBefore(this string str, string separator)
         /// <param name="str"></param>
         /// <param name="separator"></param>
         /// <returns>the substring after the first occurence of the separator or null if not found</returns>
-        public static string TryAfter(this string str, char separator)
+        public static string? TryAfter(this string? str, char separator)
         {
             if (str == null)
                 return null;
@@ -202,7 +202,7 @@ public static string TryAfter(this string str, char separator)
         /// <param name="str"></param>
         /// <param name="separator"></param>
         /// <returns>the substring after the first occurence of the separator or null if not found</returns>
-        public static string TryAfter(this string str, string separator)
+        public static string? TryAfter(this string? str, string separator)
         {
             if (str == null)
                 return null;
@@ -288,7 +288,7 @@ public static string AfterLast(this string str, string separator)
         /// <param name="str"></param>
         /// <param name="separator"></param>
         /// <returns>the substring before the last occurence of the separator or null if not found</returns>
-        public static string TryBeforeLast(this string str, char separator)
+        public static string? TryBeforeLast(this string? str, char separator)
         {
             if (str == null)
                 return null;
@@ -307,7 +307,7 @@ public static string TryBeforeLast(this string str, char separator)
         /// <param name="str"></param>
         /// <param name="separator"></param>
         /// <returns>the substring before the last occurence of the separator or null if not found</returns>
-        public static string TryBeforeLast(this string str, string separator)
+        public static string? TryBeforeLast(this string? str, string separator)
         {
             if (str == null)
                 return null;
@@ -325,7 +325,7 @@ public static string TryBeforeLast(this string str, string separator)
         /// <param name="str"></param>
         /// <param name="separator"></param>
         /// <returns>the substring after the last occurence of the separator or null if not found</returns>
-        public static string TryAfterLast(this string str, char separator)
+        public static string? TryAfterLast(this string? str, char separator)
         {
             if (str == null)
                 return null;
@@ -343,7 +343,7 @@ public static string TryAfterLast(this string str, char separator)
         /// <param name="str"></param>
         /// <param name="separator"></param>
         /// <returns>the substring after the last occurence of the separator or null if not found</returns>
-        public static string TryAfterLast(this string str, string separator)
+        public static string? TryAfterLast(this string? str, string separator)
         {
             if (str == null)
                 return null;
@@ -355,7 +355,7 @@ public static string TryAfterLast(this string str, string separator)
             return str.Substring(index + separator.Length);
         }
 
-        public static string Between(this string str, string firstSeparator, string secondSeparator = null)
+        public static string Between(this string str, string firstSeparator, string? secondSeparator = null)
         {
             if (secondSeparator == null)
                 secondSeparator = firstSeparator;
@@ -391,10 +391,10 @@ public static string Between(this string str, char firstSeparator, char secondSe
             return str.Substring(start, end - start);
         }
 
-        public static string TryBetween(this string str, string firstSeparator, string secondSeparator = null)
+        public static string? TryBetween(this string? str, string firstSeparator, string? secondSeparator = null)
         {
-            if (secondSeparator == null)
-                secondSeparator = firstSeparator;
+            if (str == null)
+                return null;
 
             int start = str.IndexOf(firstSeparator);
             if (start == -1)
@@ -402,17 +402,17 @@ public static string TryBetween(this string str, string firstSeparator, string s
 
             start = start + 1;
 
-            int end = str.IndexOf(secondSeparator, start);
+            int end = str.IndexOf(secondSeparator ?? firstSeparator, start);
             if (start == -1)
                 return null;
 
             return str.Substring(start, end - start);
         }
 
-        public static string TryBetween(this string str, char firstSeparator, char secondSeparator = (char)0)
+        public static string? TryBetween(this string? str, char firstSeparator, char? secondSeparator = null)
         {
-            if (secondSeparator == 0)
-                secondSeparator = firstSeparator;
+            if (str == null)
+                return null;
 
             int start = str.IndexOf(firstSeparator);
             if (start == -1)
@@ -420,7 +420,7 @@ public static string TryBetween(this string str, char firstSeparator, char secon
 
             start = start + 1;
 
-            int end = str.IndexOf(secondSeparator, start);
+            int end = str.IndexOf(secondSeparator ?? firstSeparator, start);
             if (start == -1)
                 return null;
 
@@ -435,7 +435,7 @@ public static string Start(this string str, int numChars)
             return str.Substring(0, numChars);
         }
 
-        public static string TryStart(this string str, int numChars)
+        public static string? TryStart(this string? str, int numChars)
         {
             if (str == null)
                 return null;
@@ -454,7 +454,7 @@ public static string End(this string str, int numChars)
             return str.Substring(str.Length - numChars, numChars);
         }
 
-        public static string TryEnd(this string str, int numChars)
+        public static string? TryEnd(this string? str, int numChars)
         {
             if (str == null)
                 return null;
@@ -530,7 +530,7 @@ public static string PadChopLeft(this string str, int length)
             return str.Length > length ? str.Substring(str.Length - length, length) : str.PadLeft(length);
         }
 
-        public static string FirstNonEmptyLine(this string str)
+        public static string? FirstNonEmptyLine(this string? str)
         {
             if (str == null)
                 return null;
@@ -598,7 +598,7 @@ public static string RemoveChars(this string str, params char[] chars)
             return sb.ToString();
         }
 
-        public static string FormatWith(this string format, object arg0)
+        public static string FormatWith(this string format, object? arg0)
         {
             return string.Format(format, arg0);
         }
@@ -630,7 +630,7 @@ public static string Replace(this string str, Dictionary<string, string> replace
 
         public static string Replace(this string str, Dictionary<char, char> replacements)
         {
-            StringBuilder sb = null;
+            StringBuilder? sb = null;
             for (int i = 0; i < str.Length; i++)
             {
                 char c = str[i];
@@ -763,7 +763,7 @@ public static string ToComputerSize(this long value, bool useAbbreviations)
 
         public static string Combine(this string separator, params object[] elements)
         {
-            StringBuilder sb = null;
+            StringBuilder? sb = null;
             foreach (var item in elements)
             {
                 if (item != null)
@@ -782,7 +782,7 @@ public static string Combine(this string separator, params object[] elements)
 
         public static string CombineIfNotEmpty(this string separator, params object[] elements)
         {
-            StringBuilder sb = null;
+            StringBuilder? sb = null;
             foreach (var item in elements)
             {
                 string str;
diff --git a/Signum.Utilities/Signum.Utilities.csproj b/Signum.Utilities/Signum.Utilities.csproj
index efcfd4d0f5..9bdbe60fcb 100644
--- a/Signum.Utilities/Signum.Utilities.csproj
+++ b/Signum.Utilities/Signum.Utilities.csproj
@@ -2,8 +2,10 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp2.2</TargetFramework>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>8.0</LangVersion>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
+    <NullableReferenceTypes>true</NullableReferenceTypes>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
diff --git a/Signum.Utilities/StringDistance.cs b/Signum.Utilities/StringDistance.cs
index 7434340cea..cb20bce014 100644
--- a/Signum.Utilities/StringDistance.cs
+++ b/Signum.Utilities/StringDistance.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.RegularExpressions;
@@ -10,12 +10,12 @@ public class StringDistance
     {
         int[,] num;
 
-        public int LevenshteinDistance(string strOld, string strNew, IEqualityComparer<char> comparer = null, Func<Choice<char>, int> weight = null, bool allowTransposition = false)
+        public int LevenshteinDistance(string strOld, string strNew, IEqualityComparer<char> comparer = null, Func<Choice<char>, int>? weight = null, bool allowTransposition = false)
         {
             return LevenshteinDistance<char>(strOld.ToCharArray(), strNew.ToCharArray(), comparer, weight, allowTransposition);
         }
 
-        public int LevenshteinDistance<T>(T[] strOld, T[] strNew, IEqualityComparer<T> comparer = null, Func<Choice<T>, int> weight = null, bool allowTransposition = false)
+        public int LevenshteinDistance<T>(T[] strOld, T[] strNew, IEqualityComparer<T> comparer = null, Func<Choice<T>, int>? weight = null, bool allowTransposition = false)
         {
             int M1 = strOld.Length + 1;
             int M2 = strNew.Length + 1;
@@ -68,16 +68,16 @@ public enum ChoiceType
             Transpose,
         }
 
-        public struct Choice<T>
+        public struct Choice<T> where T: object
         {
             public readonly ChoiceType Type;
-            public readonly T Removed;
-            public readonly T Added;
+            public readonly T? Removed;
+            public readonly T? Added;
 
             public bool HasRemoved { get { return Type != ChoiceType.Add; } }
             public bool HasAdded { get { return Type != ChoiceType.Remove; } }
 
-            internal Choice( ChoiceType type, T removed, T added)
+            internal Choice( ChoiceType type, T? removed, T? added)
             {
                 this.Type = type;
                 this.Removed = removed;
@@ -110,7 +110,7 @@ internal static Choice<T> Transpose(T remove, T add)
             }
 
 
-            public override string ToString()
+            public override string? ToString()
             {
                 switch (Type)
                 {
@@ -221,7 +221,7 @@ public int LongestCommonSubstring(string str1, string str2, out int startPos1, o
             return LongestCommonSubstring<char>(str1.ToCharArray(), str2.ToCharArray(), out startPos1, out startPos2);
         }
 
-        public int LongestCommonSubstring<T>(T[] str1, T[] str2, out int startPos1, out int startPos2, IEqualityComparer<T> comparer = null)
+        public int LongestCommonSubstring<T>(T[] str1, T[] str2, out int startPos1, out int startPos2, IEqualityComparer<T>? comparer = null)
         {
             if (str1 == null)
                 throw new ArgumentNullException("str1");
@@ -233,7 +233,7 @@ public int LongestCommonSubstring<T>(T[] str1, T[] str2, out int startPos1, out
         }
 
         //http://en.wikibooks.org/wiki/Algorithm_Implementation/Strings/Longest_common_substring
-        public int LongestCommonSubstring<T>(Slice<T> str1, Slice<T> str2, out int startPos1, out int startPos2, IEqualityComparer<T> comparer = null)
+        public int LongestCommonSubstring<T>(Slice<T> str1, Slice<T> str2, out int startPos1, out int startPos2, IEqualityComparer<T>? comparer = null)
         {
             startPos1 = 0;
             startPos2 = 0;
@@ -429,14 +429,14 @@ public List<DiffPair<string>> DiffWords(string strOld, string strNew)
             return Diff(wordsOld, wordsNew);
         }
 
-        public List<DiffPair<T>> Diff<T>(T[] strOld, T[] strNew, IEqualityComparer<T> comparer = null)
+        public List<DiffPair<T>> Diff<T>(T[] strOld, T[] strNew, IEqualityComparer<T>? comparer = null)
         {
             var result = new List<DiffPair<T>>();
             DiffPrivate<T>(new Slice<T>(strOld), new Slice<T>(strNew), comparer, result);
             return result;
         }
 
-        void DiffPrivate<T>(Slice<T> sliceOld, Slice<T> sliceNew, IEqualityComparer<T> comparer, List<DiffPair<T>> result)
+        void DiffPrivate<T>(Slice<T> sliceOld, Slice<T> sliceNew, IEqualityComparer<T>? comparer, List<DiffPair<T>> result)
         {
             int length = LongestCommonSubstring<T>(sliceOld, sliceNew, out int posOld, out int posNew, comparer);
 
@@ -461,7 +461,7 @@ static void AddResults<T>(List<DiffPair<T>> list, Slice<T> slice, DiffAction act
                 list.Add(new DiffPair<T>(action, slice[i]));
         }
 
-        void TryDiff<T>(Slice<T> sliceOld, Slice<T> sliceNew, IEqualityComparer<T> comparer, List<DiffPair<T>> result)
+        void TryDiff<T>(Slice<T> sliceOld, Slice<T> sliceNew, IEqualityComparer<T>? comparer, List<DiffPair<T>> result)
         {
             if (sliceOld.Length > 0 && sliceOld.Length > 0)
             {
diff --git a/Signum.Utilities/Synchronization/ResetLazy.cs b/Signum.Utilities/Synchronization/ResetLazy.cs
index 27e68d4497..ab5de3b2a6 100644
--- a/Signum.Utilities/Synchronization/ResetLazy.cs
+++ b/Signum.Utilities/Synchronization/ResetLazy.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Runtime.InteropServices;
 using System.Threading;
 using System.Diagnostics;
@@ -15,6 +15,11 @@ public interface IResetLazy
 
     public class ResetLazyStats
     {
+        public ResetLazyStats(Type type)
+        {
+            this.Type = type;
+        }
+
         public Type Type;
         public int Loads;
         public int Invalidations;
@@ -36,7 +41,7 @@ public Box(T value)
             public readonly T Value;
         }
 
-        public ResetLazy(Func<T> valueFactory, LazyThreadSafetyMode mode = LazyThreadSafetyMode.PublicationOnly, Type declaringType = null)
+        public ResetLazy(Func<T> valueFactory, LazyThreadSafetyMode mode = LazyThreadSafetyMode.PublicationOnly, Type? declaringType = null)
         {
             if (valueFactory == null)
                 throw new ArgumentNullException("valueFactory");
@@ -56,7 +61,7 @@ public ResetLazy(Func<T> valueFactory, LazyThreadSafetyMode mode = LazyThreadSaf
 
         object syncLock = new object();
 
-        Box box;
+        Box? box;
 
         Type declaringType; 
         public Type DeclaringType
@@ -155,13 +160,12 @@ public void Reset()
 
         ResetLazyStats IResetLazy.Stats()
         {
-            return new ResetLazyStats
+            return new ResetLazyStats(typeof(T))
             {
                 SumLoadTime = this.SumLoadtime,
                 Hits = this.Hits,
                 Loads = this.Loads,
                 Invalidations = this.Invalidations,
-                Type = typeof(T)
             };
         }
 
diff --git a/Signum.Utilities/Tsv.cs b/Signum.Utilities/Tsv.cs
index 321641e29b..9a5d8a46d8 100644
--- a/Signum.Utilities/Tsv.cs
+++ b/Signum.Utilities/Tsv.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -15,8 +15,8 @@ public static class Tsv
         public static Encoding DefaultEncoding = Encoding.GetEncoding(1252);
         public static CultureInfo Culture = CultureInfo.InvariantCulture;
 
-        public static string ToTsvFile<T>(T[,] collection, string fileName, Encoding encoding = null, bool autoFlush = false, bool append = false,
-            Func<TsvColumnInfo<T>, Func<object, string>> toStringFactory = null)
+        public static string ToTsvFile<T>(T[,] collection, string fileName, Encoding? encoding = null, bool autoFlush = false, bool append = false,
+            Func<TsvColumnInfo<T>, Func<object, string>>? toStringFactory = null)
         {
             encoding = encoding ?? DefaultEncoding;
 
@@ -40,8 +40,8 @@ public static string ToTsvFile<T>(T[,] collection, string fileName, Encoding enc
             return fileName;
         }
 
-        public static string ToTsvFile<T>(this IEnumerable<T> collection, string fileName, Encoding encoding = null, bool writeHeaders = true, bool autoFlush = false, bool append = false,
-            Func<TsvColumnInfo<T>, Func<object, string>> toStringFactory = null)
+        public static string ToTsvFile<T>(this IEnumerable<T> collection, string fileName, Encoding? encoding = null, bool writeHeaders = true, bool autoFlush = false, bool append = false,
+            Func<TsvColumnInfo<T>, Func<object, string>>? toStringFactory = null)
         {
             using (FileStream fs = append ? new FileStream(fileName, FileMode.Append, FileAccess.Write) : File.Create(fileName))
                 ToTsv<T>(collection, fs, encoding, writeHeaders, autoFlush, toStringFactory);
@@ -49,8 +49,8 @@ public static string ToTsvFile<T>(this IEnumerable<T> collection, string fileNam
             return fileName;
         }
 
-        public static byte[] ToTsvBytes<T>(this IEnumerable<T> collection, Encoding encoding = null, bool writeHeaders = true, bool autoFlush = false,
-            Func<TsvColumnInfo<T>, Func<object, string>> toStringFactory = null)
+        public static byte[] ToTsvBytes<T>(this IEnumerable<T> collection, Encoding? encoding = null, bool writeHeaders = true, bool autoFlush = false,
+            Func<TsvColumnInfo<T>, Func<object, string>>? toStringFactory = null)
         {
             using (MemoryStream ms = new MemoryStream())
             {
@@ -61,8 +61,8 @@ public static byte[] ToTsvBytes<T>(this IEnumerable<T> collection, Encoding enco
 
         private const string tab = "\t";
 
-        public static void ToTsv<T>(this IEnumerable<T> collection, Stream stream, Encoding encoding = null, bool writeHeaders = true, bool autoFlush = false,
-            Func<TsvColumnInfo<T>, Func<object, string>> toStringFactory = null)
+        public static void ToTsv<T>(this IEnumerable<T> collection, Stream stream, Encoding? encoding = null, bool writeHeaders = true, bool autoFlush = false,
+            Func<TsvColumnInfo<T>, Func<object, string>>? toStringFactory = null)
         {
             encoding = encoding ?? DefaultEncoding;
 
@@ -117,7 +117,7 @@ public static void ToTsv<T>(this IEnumerable<T> collection, Stream stream, Encod
             }
         }
 
-        private static Func<object, string> GetToString<T>(TsvColumnInfo<T> column, Func<TsvColumnInfo<T>, Func<object, string>> toStringFactory)
+        private static Func<object, string> GetToString<T>(TsvColumnInfo<T> column, Func<TsvColumnInfo<T>, Func<object, string>>? toStringFactory)
         {
             if (toStringFactory != null)
             {
@@ -244,7 +244,7 @@ private static Func<string, object> GetParser<T>(TsvColumnInfo<T> column, Func<T
             T t = new T();
             for (int i = 0; i < members.Count; i++)
             {
-                string str = null;
+                string? str = null;
                 try
                 {
                     str = vals[i];
@@ -270,7 +270,7 @@ static class ColumnInfoCache<T>
                 .Select((me, i) => new TsvColumnInfo<T>(i, me, me.MemberInfo.GetCustomAttribute<FormatAttribute>()?.Format)).ToList();
         }
 
-        static object ConvertTo(string s, Type type, string format)
+        static object? ConvertTo(string s, Type type, string format)
         {
             Type baseType = Nullable.GetUnderlyingType(type);
             if (baseType != null)
@@ -296,8 +296,8 @@ static object ConvertTo(string s, Type type, string format)
 
     public class TsvReadOptions<T> where T : class
     {
-        public Func<TsvColumnInfo<T>, Func<string, object>> ParserFactory;
-        public Func<Exception, string, bool> SkipError;
+        public Func<TsvColumnInfo<T>, Func<string, object>>? ParserFactory;
+        public Func<Exception, string, bool>? SkipError;
     }
 
 
@@ -325,8 +325,8 @@ internal TsvColumnInfo(int index, MemberEntry<T> memberEntry, string format)
     public class ParseTsvException : Exception
     {
         public int? Row { get; set; }
-        public string Member { get; set; }
-        public string Value { get; set; }
+        public string? Member { get; set; }
+        public string? Value { get; set; }
 
         public ParseTsvException() { }
         public ParseTsvException(Exception inner) : base(inner.Message, inner)
@@ -349,4 +349,4 @@ public override string Message
             }
         }
     }
-}
\ No newline at end of file
+}

From 94a026e2a204612dc93b5d3b30cbd2b3171650d0 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Mon, 7 Jan 2019 08:24:50 +0100
Subject: [PATCH 02/25] more on not nullable

---
 Signum.Utilities/Extensions/Extensions.cs     | 16 ++--
 .../Reflection/MemberEntryFactory.cs          | 18 ++--
 .../Reflection/ReflectionTools.cs             | 85 +++++++++----------
 Signum.Utilities/Tsv.cs                       | 41 +++++----
 4 files changed, 74 insertions(+), 86 deletions(-)

diff --git a/Signum.Utilities/Extensions/Extensions.cs b/Signum.Utilities/Extensions/Extensions.cs
index 023cf3f39e..9bf50b1551 100644
--- a/Signum.Utilities/Extensions/Extensions.cs
+++ b/Signum.Utilities/Extensions/Extensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -13,7 +13,7 @@ namespace Signum.Utilities
     public static class Extensions
     {
         #region Parse Number
-        public static int? ToInt(this string str, NumberStyles ns = NumberStyles.Integer, CultureInfo ci = null)
+        public static int? ToInt(this string str, NumberStyles ns = NumberStyles.Integer, CultureInfo? ci = null)
         {
             if (int.TryParse(str, ns, ci ?? CultureInfo.CurrentCulture, out int result))
                 return result;
@@ -21,7 +21,7 @@ public static class Extensions
                 return null;
         }
 
-        public static long? ToLong(this string str, NumberStyles ns = NumberStyles.Integer, CultureInfo ci = null)
+        public static long? ToLong(this string str, NumberStyles ns = NumberStyles.Integer, CultureInfo? ci = null)
         {
             if (long.TryParse(str, ns, ci ?? CultureInfo.CurrentCulture, out long result))
                 return result;
@@ -29,7 +29,7 @@ public static class Extensions
                 return null;
         }
 
-        public static short? ToShort(this string str, NumberStyles ns = NumberStyles.Integer, CultureInfo ci = null)
+        public static short? ToShort(this string str, NumberStyles ns = NumberStyles.Integer, CultureInfo? ci = null)
         {
             if (short.TryParse(str, ns, ci ?? CultureInfo.CurrentCulture, out short result))
                 return result;
@@ -37,7 +37,7 @@ public static class Extensions
                 return null;
         }
 
-        public static float? ToFloat(this string str, NumberStyles ns = NumberStyles.Float | NumberStyles.AllowThousands, CultureInfo ci = null)
+        public static float? ToFloat(this string str, NumberStyles ns = NumberStyles.Float | NumberStyles.AllowThousands, CultureInfo? ci = null)
         {
             if (float.TryParse(str, ns, ci ?? CultureInfo.CurrentCulture, out float result))
                 return result;
@@ -45,7 +45,7 @@ public static class Extensions
                 return null;
         }
 
-        public static double? ToDouble(this string str, NumberStyles ns = NumberStyles.Float | NumberStyles.AllowThousands, CultureInfo ci = null)
+        public static double? ToDouble(this string str, NumberStyles ns = NumberStyles.Float | NumberStyles.AllowThousands, CultureInfo? ci = null)
         {
             if (double.TryParse(str, ns, ci ?? CultureInfo.CurrentCulture, out double result))
                 return result;
@@ -53,7 +53,7 @@ public static class Extensions
                 return null;
         }
 
-        public static decimal? ToDecimal(this string str, NumberStyles ns = NumberStyles.Number, CultureInfo ci = null)
+        public static decimal? ToDecimal(this string str, NumberStyles ns = NumberStyles.Number, CultureInfo? ci = null)
         {
             if (decimal.TryParse(str, ns, ci ?? CultureInfo.CurrentCulture, out decimal result))
                 return result;
@@ -225,7 +225,7 @@ public static long DivCeiling(this int a, long b)
 
         #region DateTime
 
-        public static DateTime? ToDateTimeExact(this string date, string format, IFormatProvider formatProvider = null,
+        public static DateTime? ToDateTimeExact(this string date, string format, IFormatProvider? formatProvider = null,
             DateTimeStyles? styles = null)
         {
             if (DateTime.TryParseExact(date, format,
diff --git a/Signum.Utilities/Reflection/MemberEntryFactory.cs b/Signum.Utilities/Reflection/MemberEntryFactory.cs
index 838a2e3750..40c46ee0c7 100644
--- a/Signum.Utilities/Reflection/MemberEntryFactory.cs
+++ b/Signum.Utilities/Reflection/MemberEntryFactory.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
@@ -77,19 +77,19 @@ public class MemberEntry<T> : IMemberEntry
     {
         public string Name {get; private set;}
         public MemberInfo MemberInfo { get; private set; }
-        public Func<T, object> Getter { get; private set; }
-        public Func<object, object> UntypedGetter { get; private set; }
-        public Action<T, object> Setter { get; private set; }
-        public Action<object, object> UntypedSetter { get; private set; }
+        public Func<T, object?>? Getter { get; private set; }
+        public Func<object, object?>? UntypedGetter { get; private set; }
+        public Action<T, object?>? Setter { get; private set; }
+        public Action<object, object?>? UntypedSetter { get; private set; }
 
-        public MemberEntry(string name, MemberInfo memberInfo, Func<T, object> getter, Func<object,object> untypedGetter,Action<T, object> setter, Action<object,object> untypedSetter)
+        public MemberEntry(string name, MemberInfo memberInfo, Func<T, object?>? getter, Func<object, object?>? untypedGetter, Action<T, object?>? setter, Action<object, object?>? untypedSetter)
         {
             this.Name = name;
             this.MemberInfo = memberInfo;
 
             this.Getter = getter;
             this.UntypedGetter = untypedGetter;
-        
+
             this.Setter = setter;
             this.UntypedSetter = untypedSetter;
         }
@@ -99,8 +99,8 @@ public interface IMemberEntry
     {
         string Name { get; }
         MemberInfo MemberInfo { get; }
-        Func<object, object> UntypedGetter { get; }
-        Action<object, object> UntypedSetter { get; }
+        Func<object, object?>? UntypedGetter { get; }
+        Action<object, object?>? UntypedSetter { get; }
     }
 
     [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, Inherited = false, AllowMultiple = true)]
diff --git a/Signum.Utilities/Reflection/ReflectionTools.cs b/Signum.Utilities/Reflection/ReflectionTools.cs
index 98258dd863..41fa4da332 100644
--- a/Signum.Utilities/Reflection/ReflectionTools.cs
+++ b/Signum.Utilities/Reflection/ReflectionTools.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Reflection;
 using System.Linq.Expressions;
@@ -41,13 +41,11 @@ public static bool MemeberEquals(MemberInfo m1, MemberInfo m2)
             if (m1.MetadataToken != m2.MetadataToken || m1.Module != m2.Module)
                 return false;
 
-            if (m1 is MethodInfo)
+            if (m1 is MethodInfo lhsMethod)
             {
-                MethodInfo lhsMethod = m1 as MethodInfo;
-
                 if (lhsMethod.IsGenericMethod)
                 {
-                    MethodInfo rhsMethod = m2 as MethodInfo;
+                    MethodInfo rhsMethod = (MethodInfo)m2;
 
                     Type[] lhsGenArgs = lhsMethod.GetGenericArguments();
                     Type[] rhsGenArgs = rhsMethod.GetGenericArguments();
@@ -81,13 +79,11 @@ public static PropertyInfo BasePropertyInfo(LambdaExpression property)
             Expression body = property.Body;
             if (body.NodeType == ExpressionType.Convert)
                 body = ((UnaryExpression)body).Operand;
-
-            MemberExpression ex = body as MemberExpression;
-            if (ex == null)
+            
+            if (!(body is MemberExpression ex))
                 throw new ArgumentException("The lambda 'property' should be an expression accessing a property");
-
-            PropertyInfo pi = ex.Member as PropertyInfo;
-            if (pi == null)
+            
+            if (!(ex.Member is PropertyInfo pi))
                 throw new ArgumentException("The lambda 'property' should be an expression accessing a property");
 
             return pi;
@@ -107,7 +103,7 @@ public static ConstructorInfo BaseConstuctorInfo(LambdaExpression constuctor)
             if (body.NodeType == ExpressionType.Convert)
                 body = ((UnaryExpression)body).Operand;
 
-            NewExpression ex = body as NewExpression;
+            NewExpression? ex = body as NewExpression;
             if (ex == null)
                 throw new ArgumentException("The lambda 'constuctor' should be an expression constructing an object");
 
@@ -133,16 +129,14 @@ public static FieldInfo BaseFieldInfo(LambdaExpression field)
             Expression body = field.Body;
             if (body.NodeType == ExpressionType.Convert)
                 body = ((UnaryExpression)body).Operand;
-
-            MemberExpression ex = body as MemberExpression;
-            if (ex == null)
+            
+            if (!(body is MemberExpression ex))
                 throw new ArgumentException("The lambda 'field' should be an expression accessing a field");
 
-            FieldInfo pi = ex.Member as FieldInfo;
-            if (pi == null)
+            if (!(ex.Member is FieldInfo fi))
                 throw new ArgumentException("The lambda 'field' should be an expression accessing a field");
 
-            return pi;
+            return fi;
         }
 
 
@@ -165,11 +159,10 @@ public static MemberInfo BaseMemberInfo(LambdaExpression member)
             if (body.NodeType == ExpressionType.Convert)
                 body = ((UnaryExpression)body).Operand;
 
-            MemberExpression ex = body as MemberExpression;
-            if (ex == null)
+            if (!(body is MemberExpression me))
                 throw new ArgumentException("The lambda 'member' should be an expression accessing a member");
 
-            return ex.Member;
+            return me.Member;
         }
 
 
@@ -202,14 +195,12 @@ public static MethodInfo BaseMethodInfo(LambdaExpression method)
             if (body.NodeType == ExpressionType.Convert)
                 body = ((UnaryExpression)body).Operand;
 
-            MethodCallExpression ex = body as MethodCallExpression;
-            if (ex == null)
+            if (!(body is MethodCallExpression ex))
                 throw new ArgumentException("The lambda 'method' should be an expression calling a method");
 
             return ex.Method;
         }
 
-
         public static ConstructorInfo GetGenericConstructorDefinition(this ConstructorInfo ci)
         {
             return ci.DeclaringType.GetGenericTypeDefinition().GetConstructors(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance).SingleEx(a => a.MetadataToken == ci.MetadataToken);
@@ -230,7 +221,7 @@ public static Type GetReceiverType<T, R>(Expression<Func<T, R>> lambda)
             return ((MemberExpression)body).Expression.Type;
         }
 
-        public static Func<T, P> CreateGetter<T, P>(MemberInfo m)
+        public static Func<T, P>? CreateGetter<T, P>(MemberInfo m)
         {
             if ((m as PropertyInfo)?.Let(a => !a.CanRead) ?? false)
                 return null;
@@ -240,7 +231,7 @@ public static Func<T, P> CreateGetter<T, P>(MemberInfo m)
             return (Func<T, P>)exp.Compile();
         }
 
-        public static Func<T, object> CreateGetter<T>(MemberInfo m)
+        public static Func<T, object?>? CreateGetter<T>(MemberInfo m)
         {
             using (HeavyProfiler.LogNoStackTrace("CreateGetter"))
             {
@@ -250,11 +241,11 @@ public static Func<T, object> CreateGetter<T>(MemberInfo m)
                 ParameterExpression p = Expression.Parameter(typeof(T), "p");
                 Type lambdaType = typeof(Func<,>).MakeGenericType(typeof(T), typeof(object));
                 var exp = Expression.Lambda(lambdaType, Expression.Convert(Expression.MakeMemberAccess(p, m), typeof(object)), p);
-                return (Func<T, object>)exp.Compile();
+                return (Func<T, object?>)exp.Compile();
             }
         }
 
-        public static Func<object, object> CreateGetterUntyped(Type type, MemberInfo m)
+        public static Func<object, object?>? CreateGetterUntyped(Type type, MemberInfo m)
         {
             using (HeavyProfiler.LogNoStackTrace("CreateGetterUntyped"))
             {
@@ -264,11 +255,11 @@ public static Func<object, object> CreateGetterUntyped(Type type, MemberInfo m)
                 ParameterExpression p = Expression.Parameter(typeof(object), "p");
                 Type lambdaType = typeof(Func<,>).MakeGenericType(typeof(object), typeof(object));
                 var exp = Expression.Lambda(lambdaType, Expression.Convert(Expression.MakeMemberAccess(Expression.Convert(p, type), m), typeof(object)), p);
-                return (Func<object, object>)exp.Compile();
+                return (Func<object, object?>)exp.Compile();
             }
         }
 
-        public static Action<T, P> CreateSetter<T, P>(MemberInfo m)
+        public static Action<T, P>? CreateSetter<T, P>(MemberInfo m)
         {
             using (HeavyProfiler.LogNoStackTrace("CreateSetter"))
             {
@@ -283,7 +274,7 @@ public static Action<T, P> CreateSetter<T, P>(MemberInfo m)
             }
         }
 
-        public static Action<T, object> CreateSetter<T>(MemberInfo m)
+        public static Action<T, object?>? CreateSetter<T>(MemberInfo m)
         {
             using (HeavyProfiler.LogNoStackTrace("CreateSetter"))
             {
@@ -294,13 +285,13 @@ public static Action<T, object> CreateSetter<T>(MemberInfo m)
                 ParameterExpression p = Expression.Parameter(typeof(object), "p");
                 var exp = Expression.Lambda(typeof(Action<T, object>),
                     Expression.Assign(Expression.MakeMemberAccess(t, m), Expression.Convert(p, m.ReturningType())), t, p);
-                return (Action<T, object>)exp.Compile();
+                return (Action<T, object?>)exp.Compile();
             }
         }
 
         static Module module = ((Expression<Func<int>>)(() => 2)).Compile().Method.Module;
 
-        public static Action<object, object> CreateSetterUntyped(Type type, MemberInfo m)
+        public static Action<object, object?>? CreateSetterUntyped(Type type, MemberInfo m)
         {
             using (HeavyProfiler.LogNoStackTrace("CreateSetterUntyped"))
             {
@@ -311,7 +302,7 @@ public static Action<object, object> CreateSetterUntyped(Type type, MemberInfo m
                 ParameterExpression p = Expression.Parameter(typeof(object), "p");
                 var exp = Expression.Lambda(typeof(Action<object, object>),
                     Expression.Assign(Expression.MakeMemberAccess(Expression.Convert(t, type), m), Expression.Convert(p, m.ReturningType())), t, p);
-                return (Action<object, object>)exp.Compile();
+                return (Action<object, object?>)exp.Compile();
             }
         }
 
@@ -383,7 +374,7 @@ public static bool IsPercentage(string formatString, CultureInfo culture)
             return formatString.HasText() && formatString.StartsWith("p", StringComparison.InvariantCultureIgnoreCase);
         }
 
-        public static object ParsePercentage(string value, Type targetType, CultureInfo culture)
+        public static object? ParsePercentage(string value, Type targetType, CultureInfo culture)
         {
             value = value.Trim(culture.NumberFormat.PercentSymbol.ToCharArray());
 
@@ -415,7 +406,7 @@ public static T Parse<T>(string value)
                 return (T)(object)value;
 
             if (value == null || value == "")
-                return (T)(object)null;
+                return (T)(object?)null;
 
             Type utype = typeof(T).UnNullify();
             if (utype.IsEnum)
@@ -426,13 +417,13 @@ public static T Parse<T>(string value)
                 return (T)Convert.ChangeType(value, utype);
         }
 
-        public static object Parse(string value, Type type)
+        public static object? Parse(string value, Type type)
         {
             if (type == typeof(string))
                 return (object)value;
 
             if (value == null || value == "" || value == " ")
-                return (object)null;
+                return (object?)null;
 
             Type utype = type.UnNullify();
             if (utype.IsEnum)
@@ -461,7 +452,7 @@ public static T Parse<T>(string value, CultureInfo culture)
                 return (T)(object)value;
 
             if (value == null || value == "")
-                return (T)(object)null;
+                return (T)(object?)null;
 
             Type utype = typeof(T).UnNullify();
             if (utype.IsEnum)
@@ -478,7 +469,7 @@ public static object Parse(string value, Type type, CultureInfo culture)
                 return (object)value;
 
             if (value == null || value == "")
-                return (object)null;
+                return (object?)null;
 
             Type utype = type.UnNullify();
             if (utype.IsEnum)
@@ -491,7 +482,7 @@ public static object Parse(string value, Type type, CultureInfo culture)
 
         public static bool TryParse<T>(string value, out T result)
         {
-            if (TryParse(value, typeof(T), CultureInfo.CurrentCulture, out object objResult))
+            if (TryParse(value, typeof(T), CultureInfo.CurrentCulture, out object? objResult))
             {
                 result = (T)objResult;
                 return true;
@@ -505,7 +496,7 @@ public static bool TryParse<T>(string value, out T result)
 
         public static bool TryParse<T>(string value,  CultureInfo ci, out T result)
         {
-            if (TryParse(value, typeof(T), ci, out object objResult))
+            if (TryParse(value, typeof(T), ci, out object? objResult))
             {
                 result = (T)objResult;
                 return true;
@@ -517,12 +508,12 @@ public static bool TryParse<T>(string value,  CultureInfo ci, out T result)
             }
         }
 
-        public static bool TryParse(string value, Type type, out object result)
+        public static bool TryParse(string value, Type type, out object? result)
         {
             return TryParse(value, type, CultureInfo.CurrentCulture, out result);
         }
 
-        public static bool TryParse(string value, Type type, CultureInfo ci, out object result)
+        public static bool TryParse(string value, Type type, CultureInfo ci, out object? result)
         {
             if (type == typeof(string))
             {
@@ -713,7 +704,7 @@ public static bool TryParse(string value, Type type, CultureInfo ci, out object
         public static T ChangeType<T>(object value)
         {
             if (value == null)
-                return (T)(object)null;
+                return (T)(object?)null;
 
             if (value.GetType() == typeof(T))
                 return (T)value;
@@ -736,7 +727,7 @@ public static T ChangeType<T>(object value)
             }
         }
 
-        public static object ChangeType(object value, Type type)
+        public static object? ChangeType(object value, Type type)
         {
             if (value == null)
                 return null;
@@ -770,7 +761,7 @@ public static object ChangeType(object value, Type type)
                     {
                         var colType = type.IsInstantiationOf(typeof(IEnumerable<>)) ? typeof(List<>).MakeGenericType(type.GetGenericArguments()) : type;
                         IList col = (IList)Activator.CreateInstance(colType);
-                        foreach (var item in value as IEnumerable)
+                        foreach (var item in (IEnumerable)value)
                         {
                             col.Add(item);
                         }
diff --git a/Signum.Utilities/Tsv.cs b/Signum.Utilities/Tsv.cs
index 9a5d8a46d8..c41f1fabcd 100644
--- a/Signum.Utilities/Tsv.cs
+++ b/Signum.Utilities/Tsv.cs
@@ -70,16 +70,16 @@ public static void ToTsv<T>(this IEnumerable<T> collection, Stream stream, Encod
             {
                 using (StreamWriter sw = new StreamWriter(stream, encoding) { AutoFlush = autoFlush })
                 {
-                    foreach (IList row in collection)
+                    foreach (IList? row in collection)
                     {
-                        for (int i = 0; i < row.Count; i++)
+                        for (int i = 0; i < row!.Count; i++)
                         {
-                            var obj = row[i];
+                            var obj = row![i];
 
                             var str = ConvertToString(obj);
 
                             sw.Write(str);
-                            if (i < row.Count - 1)
+                            if (i < row!.Count - 1)
                                 sw.Write(tab);
                             else
                                 sw.WriteLine();
@@ -130,7 +130,7 @@ private static Func<object, string> GetToString<T>(TsvColumnInfo<T> column, Func
             return ConvertToString;
         }
 
-        static string ConvertToString(object obj)
+        static string ConvertToString(object? obj)
         {
             if (obj == null)
                 return "";
@@ -139,7 +139,7 @@ static string ConvertToString(object obj)
                 return f.ToString(null, Culture);
             else
             {
-                var p = obj.ToString();
+                var p = obj!.ToString();
                 if (p != null && p.Contains(tab))
                     throw new InvalidDataException("TSV fields can't contain the tab character, found one in value: " + p);
                 return p;
@@ -151,7 +151,7 @@ static string HandleSpaces(string p)
             return p.Replace("__", "^").Replace("_", " ").Replace("^", "_");
         }
 
-        public static List<T> ReadFile<T>(string fileName, Encoding encoding = null, int skipLines = 1, TsvReadOptions<T> options = null) where T : class, new()
+        public static List<T> ReadFile<T>(string fileName, Encoding? encoding = null, int skipLines = 1, TsvReadOptions<T>? options = null) where T : class, new()
         {
             encoding = encoding ?? DefaultEncoding;
 
@@ -159,21 +159,20 @@ static string HandleSpaces(string p)
                 return ReadStream<T>(fs, encoding, skipLines, options).ToList();
         }
 
-        public static List<T> ReadBytes<T>(byte[] data, Encoding encoding = null, int skipLines = 1, TsvReadOptions<T> options = null) where T : class, new()
+        public static List<T> ReadBytes<T>(byte[] data, Encoding? encoding = null, int skipLines = 1, TsvReadOptions<T>? options = null) where T : class, new()
         {
             using (MemoryStream ms = new MemoryStream(data))
                 return ReadStream<T>(ms, encoding, skipLines, options).ToList();
         }
 
-        public static IEnumerable<T> ReadStream<T>(Stream stream, Encoding encoding = null, int skipLines = 1, TsvReadOptions<T> options = null) where T : class, new()
+        public static IEnumerable<T> ReadStream<T>(Stream stream, Encoding? encoding = null, int skipLines = 1, TsvReadOptions<T>? options = null) where T : class, new()
         {
             encoding = encoding ?? DefaultEncoding;
-            if (options == null)
-                options = new TsvReadOptions<T>();
+            var defOptions = options ?? new TsvReadOptions<T>();
 
             var columns = ColumnInfoCache<T>.Columns;
             var members = columns.Select(c => c.MemberEntry).ToList();
-            var parsers = columns.Select(c => GetParser(c, options.ParserFactory)).ToList();
+            var parsers = columns.Select(c => GetParser(c, defOptions.ParserFactory)).ToList();
 
 
             using (StreamReader sr = new StreamReader(stream, encoding))
@@ -189,7 +188,7 @@ static string HandleSpaces(string p)
                     if (tsvLine == null)
                         yield break;
 
-                    T t = null;
+                    T? t = null;
                     try
                     {
                         t = ReadObject<T>(tsvLine, members, parsers);
@@ -198,7 +197,7 @@ static string HandleSpaces(string p)
                     {
                         e.Data["row"] = line;
 
-                        if (options.SkipError == null || !options.SkipError(e, tsvLine))
+                        if (defOptions.SkipError == null || !options.SkipError(e, tsvLine))
                             throw new ParseCsvException(e);
                     }
 
@@ -208,20 +207,19 @@ static string HandleSpaces(string p)
             }
         }
 
-        public static T ReadLine<T>(string tsvLine, TsvReadOptions<T> options = null)
+        public static T ReadLine<T>(string tsvLine, TsvReadOptions<T>? options = null)
             where T : class, new()
         {
-            if (options == null)
-                options = new TsvReadOptions<T>();
+            var defOptions = options ?? new TsvReadOptions<T>();
 
             var columns = ColumnInfoCache<T>.Columns;
 
             return ReadObject<T>(tsvLine,
                 columns.Select(c => c.MemberEntry).ToList(),
-                columns.Select(c => GetParser(c, options.ParserFactory)).ToList());
+                columns.Select(c => GetParser(c, defOptions.ParserFactory)).ToList());
         }
 
-        private static Func<string, object> GetParser<T>(TsvColumnInfo<T> column, Func<TsvColumnInfo<T>, Func<string, object>> parserFactory)
+        private static Func<string, object?> GetParser<T>(TsvColumnInfo<T> column, Func<TsvColumnInfo<T>, Func<string, object>>? parserFactory)
         {
             if (parserFactory != null)
             {
@@ -234,7 +232,7 @@ private static Func<string, object> GetParser<T>(TsvColumnInfo<T> column, Func<T
             return str => ConvertTo(str, column.MemberInfo.ReturningType(), column.Format);
         }
 
-        static T ReadObject<T>(string line, List<MemberEntry<T>> members, List<Func<string, object>> parsers) where T : new()
+        static T ReadObject<T>(string line, List<MemberEntry<T>> members, List<Func<string, object?>> parsers) where T : new()
         {
             var vals = line.Split(new[] { tab }, StringSplitOptions.None).ToList();
 
@@ -248,7 +246,7 @@ private static Func<string, object> GetParser<T>(TsvColumnInfo<T> column, Func<T
                 try
                 {
                     str = vals[i];
-                    object val = parsers[i](str);
+                    object? val = parsers[i](str);
                     members[i].Setter(t, val);
                 }
                 catch (Exception e)
@@ -300,7 +298,6 @@ public class TsvReadOptions<T> where T : class
         public Func<Exception, string, bool>? SkipError;
     }
 
-
     public class TsvColumnInfo<T>
     {
         public readonly int Index;

From 0c3c53fe54c6b7fd0eab1e573c6be0a439afac94 Mon Sep 17 00:00:00 2001
From: Olmo del Corral Cano <olmo.delcorralcano@bechtle.com>
Date: Mon, 7 Jan 2019 08:32:37 +0100
Subject: [PATCH 03/25] more on not nullable

---
 .../Extensions/StringExtensions.cs            |  8 ++--
 Signum.Utilities/StringDistance.cs            | 45 +++++++++++--------
 2 files changed, 30 insertions(+), 23 deletions(-)

diff --git a/Signum.Utilities/Extensions/StringExtensions.cs b/Signum.Utilities/Extensions/StringExtensions.cs
index 3a448a1a02..22f5c20ac9 100644
--- a/Signum.Utilities/Extensions/StringExtensions.cs
+++ b/Signum.Utilities/Extensions/StringExtensions.cs
@@ -603,22 +603,22 @@ public static string FormatWith(this string format, object? arg0)
             return string.Format(format, arg0);
         }
 
-        public static string FormatWith(this string format, object arg0, object arg1)
+        public static string FormatWith(this string format, object? arg0, object? arg1)
         {
             return string.Format(format, arg0, arg1);
         }
 
-        public static string FormatWith(this string format, object arg0, object arg1, object arg2)
+        public static string FormatWith(this string format, object? arg0, object? arg1, object? arg2)
         {
             return string.Format(format, arg0, arg1, arg2);
         }
 
-        public static string FormatWith(this string pattern, params object[] parameters)
+        public static string FormatWith(this string pattern, params object?[] parameters)
         {
             return string.Format(pattern, parameters);
         }
 
-        public static string FormatWith(this string format, IFormatProvider provider, params object[] args)
+        public static string FormatWith(this string format, IFormatProvider provider, params object?[] args)
         {
             return string.Format(provider, format, args);
         }
diff --git a/Signum.Utilities/StringDistance.cs b/Signum.Utilities/StringDistance.cs
index cb20bce014..ed354281e4 100644
--- a/Signum.Utilities/StringDistance.cs
+++ b/Signum.Utilities/StringDistance.cs
@@ -8,14 +8,14 @@ namespace Signum.Utilities
 {
     public class StringDistance
     {
-        int[,] num;
+        int[,]? _cachedNum;
 
-        public int LevenshteinDistance(string strOld, string strNew, IEqualityComparer<char> comparer = null, Func<Choice<char>, int>? weight = null, bool allowTransposition = false)
+        public int LevenshteinDistance(string strOld, string strNew, IEqualityComparer<char>? comparer = null, Func<Choice<char>, int>? weight = null, bool allowTransposition = false)
         {
             return LevenshteinDistance<char>(strOld.ToCharArray(), strNew.ToCharArray(), comparer, weight, allowTransposition);
         }
 
-        public int LevenshteinDistance<T>(T[] strOld, T[] strNew, IEqualityComparer<T> comparer = null, Func<Choice<T>, int>? weight = null, bool allowTransposition = false)
+        public int LevenshteinDistance<T>(T[] strOld, T[] strNew, IEqualityComparer<T>? comparer = null, Func<Choice<T>, int>? weight = null, bool allowTransposition = false)
         {
             int M1 = strOld.Length + 1;
             int M2 = strNew.Length + 1;
@@ -26,7 +26,7 @@ public int LevenshteinDistance<T>(T[] strOld, T[] strNew, IEqualityComparer<T> c
             if (weight == null)
                 weight = c => 1;
 
-            ResizeArray(M1, M2);
+            var num = ResizeArray(M1, M2);
 
             num[0, 0] = 0;
 
@@ -68,16 +68,16 @@ public enum ChoiceType
             Transpose,
         }
 
-        public struct Choice<T> where T: object
+        public struct Choice<T>
         {
             public readonly ChoiceType Type;
-            public readonly T? Removed;
-            public readonly T? Added;
+            public readonly T Removed;
+            public readonly T Added;
 
             public bool HasRemoved { get { return Type != ChoiceType.Add; } }
             public bool HasAdded { get { return Type != ChoiceType.Remove; } }
 
-            internal Choice( ChoiceType type, T? removed, T? added)
+            internal Choice( ChoiceType type, T removed, T added)
             {
                 this.Type = type;
                 this.Removed = removed;
@@ -86,12 +86,12 @@ internal Choice( ChoiceType type, T? removed, T? added)
 
             public static Choice<T> Add(T value)
             {
-                return new Choice<T>(ChoiceType.Add, default(T), value);
+                return new Choice<T>(ChoiceType.Add, default(T)!, value);
             }
 
             public static Choice<T> Remove(T value)
             {
-                return new Choice<T>(ChoiceType.Remove, value, default(T));
+                return new Choice<T>(ChoiceType.Remove, value, default(T)!);
             }
 
             public static Choice<T> Equal(T value)
@@ -125,12 +125,12 @@ internal static Choice<T> Transpose(T remove, T add)
             
         }
 
-        public List<Choice<char>> LevenshteinChoices(string strOld, string strNew, IEqualityComparer<char> comparer = null, Func<Choice<char>, int> weight = null)
+        public List<Choice<char>> LevenshteinChoices(string strOld, string strNew, IEqualityComparer<char>? comparer = null, Func<Choice<char>, int>? weight = null)
         {
             return LevenshteinChoices<char>(strOld.ToCharArray(), strNew.ToCharArray(), comparer, weight);
         }
 
-        public List<Choice<T>> LevenshteinChoices<T>(T[] strOld, T[] strNew, IEqualityComparer<T> comparer = null, Func<Choice<T>, int> weight = null)
+        public List<Choice<T>> LevenshteinChoices<T>(T[] strOld, T[] strNew, IEqualityComparer<T>? comparer = null, Func<Choice<T>, int>? weight = null)
         {
             if (comparer == null)
                 comparer = EqualityComparer<T>.Default;
@@ -159,6 +159,8 @@ public List<Choice<T>> LevenshteinChoices<T>(T[] strOld, T[] strNew, IEqualityCo
                     var cAdd = Choice<T>.Add(strNew[j - 1]);
                     var cSubstitute = Choice<T>.Substitute(strOld[i - 1], strNew[j - 1]);
 
+                    var num = _cachedNum!; 
+
                     var remove = num[i - 1, j] + weight(cRemove);
                     var add = num[i, j - 1] + weight(cAdd);
                     var substitute = num[i - 1, j - 1] + weight(cSubstitute);
@@ -244,7 +246,7 @@ public int LongestCommonSubstring<T>(Slice<T> str1, Slice<T> str2, out int start
             if (comparer == null)
                 comparer = EqualityComparer<T>.Default;
 
-            ResizeArray(str1.Length, str2.Length);
+            var num = ResizeArray(str1.Length, str2.Length);
 
             int maxlen = 0;
 
@@ -275,7 +277,10 @@ public int LongestCommonSubstring<T>(Slice<T> str1, Slice<T> str2, out int start
 
         string DebugTable()
         {
-            return num.SelectArray(a => a.ToString()).FormatTable();
+            if (_cachedNum == null)
+                throw new InvalidOperationException("Not initialized");
+
+            return _cachedNum.SelectArray(a => a.ToString()).FormatTable();
         }
 
         public int LongestCommonSubsequence(string str1, string str2)
@@ -290,7 +295,7 @@ public int LongestCommonSubsequence(string str1, string str2)
         /// <summary>
         /// ACE is a subsequence of ABCDE
         /// </summary>
-        public int LongestCommonSubsequence<T>(T[] str1, T[] str2, IEqualityComparer<T> comparer = null)
+        public int LongestCommonSubsequence<T>(T[] str1, T[] str2, IEqualityComparer<T>? comparer = null)
         {
             if (str1 == null)
                 throw new ArgumentNullException("str1");
@@ -307,7 +312,7 @@ public int LongestCommonSubsequence<T>(T[] str1, T[] str2, IEqualityComparer<T>
             int M1 = str1.Length + 1;
             int M2 = str2.Length + 1;
 
-            ResizeArray(M1, M2);
+            var num = ResizeArray(M1, M2);
 
             for (int i = 0; i < M1; i++)
                 num[i, 0] = 0;
@@ -333,12 +338,14 @@ public int LongestCommonSubsequence<T>(T[] str1, T[] str2, IEqualityComparer<T>
             return num[str1.Length, str2.Length];
         }
 
-        private void ResizeArray(int M1, int M2)
+        private int [,] ResizeArray(int M1, int M2)
         {
-            if (num == null || M1 > num.GetLength(0) || M2 > num.GetLength(1))
+            if (_cachedNum == null || M1 > _cachedNum.GetLength(0) || M2 > _cachedNum.GetLength(1))
             {
-                num = new int[M1, M2];
+                _cachedNum = new int[M1, M2];
             }
+
+            return _cachedNum;
         }
 
 

From 19f34c7f1b34a0e62c24b43087c09e8e4bf7c09e Mon Sep 17 00:00:00 2001
From: Olmo del Corral Cano <olmo.delcorralcano@bechtle.com>
Date: Mon, 7 Jan 2019 09:53:12 +0100
Subject: [PATCH 04/25] more in not nullable

---
 Signum.Utilities/ConsoleSwitch.cs             |  27 +--
 Signum.Utilities/Csv.cs                       |  31 ++-
 .../DataStructures/ImmutableStack.cs          |  18 +-
 .../DataStructures/ScopedDictionary.cs        |  18 +-
 .../ExpandableQueryProvider.cs                |   2 +-
 .../ExpressionTrees/ExpressionComparer.cs     |  10 +-
 .../Extensions/DictionaryExtensions.cs        |  40 ++--
 .../Extensions/EnumerableExtensions.cs        | 201 ++++++++++--------
 Signum.Utilities/Extensions/Extensions.cs     |   4 +-
 .../Extensions/StreamExtensions.cs            |   4 +-
 .../Extensions/StringExtensions.cs            |  14 +-
 .../NaturalLanguage/NaturalLanguageTools.cs   |  26 +--
 Signum.Utilities/Polymorphic.cs               |  69 +++---
 Signum.Utilities/Profiler/HeavyProfiler.cs    |  30 +--
 Signum.Utilities/SafeConsole.cs               |  18 +-
 Signum.Utilities/Signum.Utilities.csproj      |   4 +
 Signum.Utilities/Statics.cs                   |  41 ++--
 17 files changed, 296 insertions(+), 261 deletions(-)

diff --git a/Signum.Utilities/ConsoleSwitch.cs b/Signum.Utilities/ConsoleSwitch.cs
index 9187b68573..6d7d7c58eb 100644
--- a/Signum.Utilities/ConsoleSwitch.cs
+++ b/Signum.Utilities/ConsoleSwitch.cs
@@ -5,7 +5,9 @@
 
 namespace Signum.Utilities
 {
-    public class ConsoleSwitch<K, V> : IEnumerable<KeyValuePair<string, WithDescription<V>>> where V : class
+    public class ConsoleSwitch<K, V> : IEnumerable<KeyValuePair<string, WithDescription<V>>>
+        where K : object
+        where V : class
     {
         Dictionary<string, WithDescription<V>> dictionary = new Dictionary<string, WithDescription<V>>(StringComparer.InvariantCultureIgnoreCase);
         Dictionary<int, string> separators = new Dictionary<int, string>();
@@ -37,7 +39,7 @@ public void Add(K key, V value, string description)
             dictionary.AddOrThrow(key.ToString(), new WithDescription<V>(value, description), "Key {0} already in ConsoleSwitch");
         }
         
-        public V Choose(int? numberOfOptions = null)
+        public V? Choose(int? numberOfOptions = null)
         {
             var tuple = ChooseTuple(numberOfOptions);
 
@@ -47,7 +49,7 @@ public V Choose(int? numberOfOptions = null)
             return tuple.Value;
         }
 
-        public WithDescription<V> ChooseTuple(int? numberOfOptions = null)
+        public WithDescription<V>? ChooseTuple(int? numberOfOptions = null)
         {
             Console.WriteLine(welcomeMessage);
             var noOfOptsPerScreen = numberOfOptions ?? dictionary.Count;
@@ -89,7 +91,7 @@ void PrintOptions(int skip, int take)
             {
                 var key = keys[i];
 
-                string value = separators.TryGetC(i);
+                string? value = separators.TryGetC(i);
                 if (value.HasText())
                 {
                     Console.WriteLine();
@@ -105,13 +107,13 @@ void PrintOptions(int skip, int take)
             Console.WriteLine(" - " + ConsoleMessage.More.NiceToString());
         }
 
-        public V[] ChooseMultiple(string[] args = null)
+        public V[]? ChooseMultiple(string[]? args = null)
         {
             return ChooseMultiple(ConsoleMessage.EnterYoutSelectionsSeparatedByComma.NiceToString(), args);
         }
 
 
-        public V[] ChooseMultiple(string endMessage, string[] args = null)
+        public V[]? ChooseMultiple(string endMessage, string[]? args = null)
         {
             var array = ChooseMultipleWithDescription(endMessage, args);
 
@@ -122,12 +124,12 @@ public V[] ChooseMultiple(string endMessage, string[] args = null)
 
         }
 
-        public WithDescription<V>[] ChooseMultipleWithDescription(string[] args = null)
+        public WithDescription<V>[]? ChooseMultipleWithDescription(string[]? args = null)
         {
             return ChooseMultipleWithDescription(ConsoleMessage.EnterYoutSelectionsSeparatedByComma.NiceToString(), args);
         }
 
-        public WithDescription<V>[] ChooseMultipleWithDescription(string endMessage, string[] args = null)
+        public WithDescription<V>[]? ChooseMultipleWithDescription(string endMessage, string[]? args = null)
         {
             if (args != null)
                 return args.ToString(" ").SplitNoEmpty(',').SelectMany(GetValuesRange).ToArray();
@@ -191,7 +193,7 @@ int GetIndex(string value)
             return index;
         }
 
-        WithDescription<V> TryGetValue(string input)
+        WithDescription<V>? TryGetValue(string input)
         {
             var exact = dictionary.TryGetC(input);
             if (exact != null)
@@ -242,7 +244,8 @@ public enum ConsoleMessage
         More
     }
 
-    public class WithDescription<T>
+    public class WithDescription<T> 
+        where T : class
     {
         public T Value { get; private set; }
 
@@ -274,14 +277,14 @@ static string DefaultDescription(object value)
 
     public static class ConsoleSwitchExtensions
     {
-        public static T ChooseConsole<T>(this IEnumerable<T> collection, Func<T, string>? getString = null, string? message = null) where T : class        {
+        public static T? ChooseConsole<T>(this IEnumerable<T> collection, Func<T, string>? getString = null, string? message = null) where T : class        {
       
             var cs = new ConsoleSwitch<int, T>(message ?? ConsoleMessage.SelectOneOfTheFollowingOptions.NiceToString());
             cs.Load(collection.ToList(), getString);
             return cs.Choose();
         }
 
-        public static T[] ChooseConsoleMultiple<T>(this IEnumerable<T> collection, Func<T, string>? getString = null, string? message = null) where T : class
+        public static T[]? ChooseConsoleMultiple<T>(this IEnumerable<T> collection, Func<T, string>? getString = null, string? message = null) where T : class
         {
             var cs = new ConsoleSwitch<int, T>(message ?? ConsoleMessage.SelectOneOfTheFollowingOptions.NiceToString());
             cs.Load(collection.ToList(), getString);
diff --git a/Signum.Utilities/Csv.cs b/Signum.Utilities/Csv.cs
index 0d5df85240..4d135b1f1b 100644
--- a/Signum.Utilities/Csv.cs
+++ b/Signum.Utilities/Csv.cs
@@ -84,7 +84,7 @@ public static void ToCsv<T>(this IEnumerable<T> collection, Stream stream, Encod
                     {
                         for (int i = 0; i < members.Count; i++)
                         {
-                            var obj = members[i].Getter(item);
+                            var obj = members[i].Getter!(item);
 
                             var str = EncodeCsv(toString[i](obj), defCulture);
 
@@ -245,15 +245,14 @@ static string HandleSpaces(string p)
             }
         }
 
-        public static T ReadLine<T>(string csvLine, CultureInfo? culture = null, CsvReadOptions<T> options = null)
+        public static T ReadLine<T>(string csvLine, CultureInfo? culture = null, CsvReadOptions<T>? options = null)
             where T : class, new()
         {
-            if (options == null)
-                options = new CsvReadOptions<T>();
+            var defOptions = options ?? new CsvReadOptions<T>();
 
-            culture = culture ?? DefaultCulture ?? CultureInfo.CurrentCulture;
+            var defCulture = culture ?? DefaultCulture ?? CultureInfo.CurrentCulture;
 
-            Regex regex = GetRegex(culture, options.RegexTimeout);
+            Regex regex = GetRegex(defCulture, defOptions.RegexTimeout);
 
             Match m = regex.Match(csvLine);
 
@@ -261,10 +260,10 @@ public static T ReadLine<T>(string csvLine, CultureInfo? culture = null, CsvRead
 
             return ReadObject<T>(m,
                 columns.Select(c => c.MemberEntry).ToList(),
-                columns.Select(c => GetParser(culture, c, options.ParserFactory)).ToList());
+                columns.Select(c => GetParser(defCulture, c, defOptions.ParserFactory)).ToList());
         }
 
-        private static Func<string, object> GetParser<T>(CultureInfo culture, CsvColumnInfo<T> column, Func<CsvColumnInfo<T>, CultureInfo, Func<string, object>>? parserFactory)
+        private static Func<string, object?> GetParser<T>(CultureInfo culture, CsvColumnInfo<T> column, Func<CsvColumnInfo<T>, CultureInfo, Func<string, object?>>? parserFactory)
         {
             if (parserFactory != null)
             {
@@ -277,7 +276,7 @@ private static Func<string, object> GetParser<T>(CultureInfo culture, CsvColumnI
             return str => ConvertTo(str, column.MemberInfo.ReturningType(), culture, column.Format);
         }
 
-        static T ReadObject<T>(Match m, List<MemberEntry<T>> members, List<Func<string, object>> parsers) where T : new()
+        static T ReadObject<T>(Match m, List<MemberEntry<T>> members, List<Func<string, object?>> parsers) where T : new()
         {
             var vals = m.Groups["val"].Captures;
 
@@ -287,14 +286,14 @@ private static Func<string, object> GetParser<T>(CultureInfo culture, CsvColumnI
             T t = new T();
             for (int i = 0; i < members.Count; i++)
             {
-                string str = null; 
+                string? str = null; 
                 try
                 {
                     str = DecodeCsv(vals[i].Value);
 
-                    object val = parsers[i](str);
+                    object? val = parsers[i](str);
 
-                    members[i].Setter(t, val);
+                    members[i].Setter!(t, val);
                 }
                 catch (Exception e)
                 {
@@ -336,7 +335,7 @@ static string DecodeCsv(string s)
             return s;
         }
 
-        static object ConvertTo(string s, Type type, CultureInfo culture, string format)
+        static object? ConvertTo(string s, Type type, CultureInfo culture, string format)
         {
             Type baseType = Nullable.GetUnderlyingType(type);
             if (baseType != null)
@@ -362,9 +361,9 @@ static object ConvertTo(string s, Type type, CultureInfo culture, string format)
 
     public class CsvReadOptions<T> where T: class
     {
-        public Func<CsvColumnInfo<T>, CultureInfo, Func<string, object>> ParserFactory;
+        public Func<CsvColumnInfo<T>, CultureInfo, Func<string, object>>? ParserFactory;
         public bool AsumeSingleLine = false;
-        public Func<Exception, Match, bool> SkipError;
+        public Func<Exception, Match?, bool>? SkipError;
         public TimeSpan RegexTimeout = Regex.InfiniteMatchTimeout;
     }
 
@@ -395,7 +394,7 @@ public class ParseCsvException : Exception
         public int? Row { get; set; }
         public string Member { get; set; }
         public string Value { get; set; }
-
+        
         public ParseCsvException() { }
         public ParseCsvException(Exception inner) : base(inner.Message, inner)
         {
diff --git a/Signum.Utilities/DataStructures/ImmutableStack.cs b/Signum.Utilities/DataStructures/ImmutableStack.cs
index 64a1ac323e..5341af2f76 100644
--- a/Signum.Utilities/DataStructures/ImmutableStack.cs
+++ b/Signum.Utilities/DataStructures/ImmutableStack.cs
@@ -1,18 +1,21 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Collections;
 using System.Threading;
 
 namespace Signum.Utilities.DataStructures
 {
-    public class ImmutableStack<T>:IEnumerable<T>
+   
+
+    public class ImmutableStack<T> : IEnumerable<T> 
+        where T : object
     {
-        private class ImmutableFullStack : ImmutableStack<T>
+        class ImmutableFullStack : ImmutableStack<T>
         {
             readonly T head;
             readonly ImmutableStack<T> tail;
 
-            public ImmutableFullStack(T head, ImmutableStack<T> tail)
+            internal ImmutableFullStack(T head, ImmutableStack<T> tail)
             {
                 this.head = head;
                 this.tail = tail;
@@ -33,12 +36,11 @@ public override string ToString()
             {
                 return "[" + this.ToString(", ") + "]";
             }
-
         }
 
         public static readonly ImmutableStack<T> Empty = new ImmutableStack<T>();
 
-        private ImmutableStack(){}
+        internal ImmutableStack() { }
 
         public virtual bool IsEmpty { get { return true; } }
         public virtual T Peek() { throw new InvalidOperationException("Empty Stack"); }
@@ -52,12 +54,12 @@ private ImmutableStack(){}
 
     public static class ImmutableStackExtensions
     {
-        public static ImmutableStack<T> Reverse<T>(this ImmutableStack<T> stack)
+        public static ImmutableStack<T> Reverse<T>(this ImmutableStack<T> stack) where T : object
         {
             return Reverse(stack, ImmutableStack<T>.Empty);
         }
 
-        public static ImmutableStack<T> Reverse<T>(this ImmutableStack<T> stack, ImmutableStack<T> initial)
+        public static ImmutableStack<T> Reverse<T>(this ImmutableStack<T> stack, ImmutableStack<T> initial) where T : object
         {
             ImmutableStack<T> r = initial;
             for (ImmutableStack<T> f = stack; !f.IsEmpty; f = f.Pop())
diff --git a/Signum.Utilities/DataStructures/ScopedDictionary.cs b/Signum.Utilities/DataStructures/ScopedDictionary.cs
index d61919a840..6e8a2ceac8 100644
--- a/Signum.Utilities/DataStructures/ScopedDictionary.cs
+++ b/Signum.Utilities/DataStructures/ScopedDictionary.cs
@@ -5,20 +5,20 @@ namespace Signum.Utilities.DataStructures
 {
     public class ScopedDictionary<TKey, TValue> : IEnumerable<KeyValuePair<TKey, TValue>>
     {
-        ScopedDictionary<TKey, TValue> previous;
+        ScopedDictionary<TKey, TValue>? previous;
         Dictionary<TKey, TValue> map;
 
         public IEqualityComparer<TKey> Comparer { get { return map.Comparer; } }
-        public ScopedDictionary<TKey, TValue> Previous { get { return previous; } }
+        public ScopedDictionary<TKey, TValue>? Previous { get { return previous; } }
 
-        public ScopedDictionary(ScopedDictionary<TKey, TValue> previous)
+        public ScopedDictionary(ScopedDictionary<TKey, TValue>? previous)
             :this(previous, EqualityComparer<TKey>.Default)
         {
             this.previous = previous;
             this.map = new Dictionary<TKey, TValue>();
         }
 
-        public ScopedDictionary(ScopedDictionary<TKey, TValue> previous, IEqualityComparer<TKey> comparer)
+        public ScopedDictionary(ScopedDictionary<TKey, TValue>? previous, IEqualityComparer<TKey> comparer)
         {
             this.previous = previous;
             this.map = new Dictionary<TKey, TValue>(comparer);
@@ -31,18 +31,18 @@ public void Add(TKey key, TValue value)
 
         public bool TryGetValue(TKey key, out TValue value)
         {
-            for (ScopedDictionary<TKey, TValue> scope = this; scope != null; scope = scope.previous)
+            for (ScopedDictionary<TKey, TValue>? scope = this; scope != null; scope = scope.previous)
             {
                 if (scope.map.TryGetValue(key, out value))
                     return true;
             }
-            value = default(TValue);
+            value = default(TValue)!;
             return false;
         }
 
         public bool ContainsKey(TKey key)
         {
-            for (ScopedDictionary<TKey, TValue> scope = this; scope != null; scope = scope.previous)
+            for (ScopedDictionary<TKey, TValue>? scope = this; scope != null; scope = scope.previous)
             {
                 if (scope.map.ContainsKey(key))
                     return true;
@@ -52,7 +52,7 @@ public bool ContainsKey(TKey key)
 
         public override string ToString()
         {
-            var str = map.ToString(kvp => kvp.Key.ToString() + " -> " + kvp.Value.ToString(), "\r\n");
+            var str = map.ToString(kvp => kvp.Key + " -> " + kvp.Value, "\r\n");
 
             if (this.previous == null)
                 return str;
@@ -83,7 +83,7 @@ public TValue GetOrCreate(TKey key, Func<TValue> valueFactory)
 
         public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
         {
-            for (var sd = this; sd != null; sd = sd.previous)
+            for (ScopedDictionary<TKey, TValue>? sd = this; sd != null; sd = sd.previous)
             {
                 foreach (var item in sd.map)
                 {
diff --git a/Signum.Utilities/ExpressionTrees/ExpandableQueryProvider.cs b/Signum.Utilities/ExpressionTrees/ExpandableQueryProvider.cs
index f8a3926056..63675c30b9 100644
--- a/Signum.Utilities/ExpressionTrees/ExpandableQueryProvider.cs
+++ b/Signum.Utilities/ExpressionTrees/ExpandableQueryProvider.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
diff --git a/Signum.Utilities/ExpressionTrees/ExpressionComparer.cs b/Signum.Utilities/ExpressionTrees/ExpressionComparer.cs
index d381f76832..88f261fd2a 100644
--- a/Signum.Utilities/ExpressionTrees/ExpressionComparer.cs
+++ b/Signum.Utilities/ExpressionTrees/ExpressionComparer.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -10,7 +10,7 @@ namespace Signum.Utilities.ExpressionTrees
 {
     public class ExpressionComparer
     {
-        internal ScopedDictionary<ParameterExpression, ParameterExpression> parameterScope;
+        internal ScopedDictionary<ParameterExpression, ParameterExpression>? parameterScope;
         bool checkParameterNames = false;
 
         protected IDisposable ParameterScope()
@@ -20,13 +20,13 @@ protected IDisposable ParameterScope()
             return new Disposable(() => parameterScope = saved);
         }
 
-        protected ExpressionComparer(ScopedDictionary<ParameterExpression, ParameterExpression> parameterScope, bool checkParameterNames)
+        protected ExpressionComparer(ScopedDictionary<ParameterExpression, ParameterExpression>? parameterScope, bool checkParameterNames)
         {
             this.parameterScope = parameterScope;
             this.checkParameterNames = checkParameterNames;
         }
 
-        public static bool AreEqual( Expression a, Expression b, ScopedDictionary<ParameterExpression, ParameterExpression> parameterScope = null, bool checkParameterNames = false)
+        public static bool AreEqual( Expression a, Expression b, ScopedDictionary<ParameterExpression, ParameterExpression>? parameterScope = null, bool checkParameterNames = false)
         {
             return new ExpressionComparer(parameterScope, checkParameterNames).Compare(a, b);
         }
@@ -187,7 +187,7 @@ protected virtual bool CompareLambda(LambdaExpression a, LambdaExpression b)
             using (ParameterScope())
             {
                 for (int i = 0; i < n; i++)
-                    parameterScope.Add(a.Parameters[i], b.Parameters[i]);
+                    parameterScope!.Add(a.Parameters[i], b.Parameters[i]);
 
                 return Compare(a.Body, b.Body);
             }
diff --git a/Signum.Utilities/Extensions/DictionaryExtensions.cs b/Signum.Utilities/Extensions/DictionaryExtensions.cs
index 2e0759a7cd..2c102d9b36 100644
--- a/Signum.Utilities/Extensions/DictionaryExtensions.cs
+++ b/Signum.Utilities/Extensions/DictionaryExtensions.cs
@@ -89,21 +89,21 @@ public static V GetOrThrow<K, V>(this IDictionary<K, V> dictionary, K key, Func<
             return result;
         }
 
-        public static V GetOrThrow<K, V>(this IDictionary<K, V> dictionary, K key, string messageWithFormat)
+        public static V GetOrThrow<K, V>(this IDictionary<K, V> dictionary, K key, string messageWithFormat) where K : object
         {
             if (!dictionary.TryGetValue(key, out V result))
                 throw new KeyNotFoundException(messageWithFormat.FormatWith(key));
             return result;
         }
 
-        public static V GetOrThrow<K, V>(this IDictionary<K, V> dictionary, K key)
+        public static V GetOrThrow<K, V>(this IDictionary<K, V> dictionary, K key) where K : object
         {
             if (!dictionary.TryGetValue(key, out V result))
                 throw new KeyNotFoundException("Key '{0}' ({1}) not found on {2}".FormatWith(key, key.GetType().TypeName(), dictionary.GetType().TypeName()));
             return result;
         }
 
-        public static void AddOrThrow<K, V>(this IDictionary<K, V> dictionary, K key, V value, string messageWithFormat)
+        public static void AddOrThrow<K, V>(this IDictionary<K, V> dictionary, K key, V value, string messageWithFormat) where K : object
         {
             if (dictionary.ContainsKey(key))
                 throw new ArgumentException(messageWithFormat.FormatWith(key));
@@ -133,7 +133,7 @@ public static Dictionary<K, V> ToDictionary<K, V>(this IEnumerable<KeyValuePair<
             return result;
         }
 
-        public static Dictionary<K, V> ToDictionaryEx<K, V>(this IEnumerable<KeyValuePair<K, V>> collection, string errorContext = null)
+        public static Dictionary<K, V> ToDictionaryEx<K, V>(this IEnumerable<KeyValuePair<K, V>> collection, string? errorContext = null)
         {
             var result = new Dictionary<K, V>();
             result.AddRange<K, V>(collection, errorContext ?? typeof(K).TypeName());
@@ -147,7 +147,7 @@ public static Dictionary<K, V> ToDictionary<K, V>(this IEnumerable<KeyValuePair<
             return result;
         }
 
-        public static Dictionary<K, V> ToDictionaryEx<K, V>(this IEnumerable<KeyValuePair<K, V>> collection, IEqualityComparer<K> comparer, string errorContext = null)
+        public static Dictionary<K, V> ToDictionaryEx<K, V>(this IEnumerable<KeyValuePair<K, V>> collection, IEqualityComparer<K> comparer, string? errorContext = null)
         {
             var result = new Dictionary<K, V>(comparer);
             result.AddRange<K, V>(collection, errorContext ?? typeof(K).TypeName());
@@ -155,28 +155,28 @@ public static Dictionary<K, V> ToDictionaryEx<K, V>(this IEnumerable<KeyValuePai
         }
 
 
-        public static Dictionary<K, T> ToDictionaryEx<T, K>(this IEnumerable<T> source, Func<T, K> keySelector, string errorContext = null)
+        public static Dictionary<K, T> ToDictionaryEx<T, K>(this IEnumerable<T> source, Func<T, K> keySelector, string? errorContext = null)
         {
             Dictionary<K, T> result = new Dictionary<K, T>();
             result.AddRange(source, keySelector, v => v, errorContext ?? typeof(K).TypeName());
             return result;
         }
 
-        public static Dictionary<K, V> ToDictionaryEx<T, K, V>(this IEnumerable<T> source, Func<T, K> keySelector, Func<T, V> elementSelector, string errorContext = null)
+        public static Dictionary<K, V> ToDictionaryEx<T, K, V>(this IEnumerable<T> source, Func<T, K> keySelector, Func<T, V> elementSelector, string? errorContext = null)
         {
             Dictionary<K, V> result = new Dictionary<K, V>();
             result.AddRange(source, keySelector, elementSelector, errorContext ?? typeof(K).TypeName());
             return result;
         }
 
-        public static Dictionary<K, T> ToDictionaryEx<T, K>(this IEnumerable<T> source, Func<T, K> keySelector, IEqualityComparer<K> comparer, string errorContext = null)
+        public static Dictionary<K, T> ToDictionaryEx<T, K>(this IEnumerable<T> source, Func<T, K> keySelector, IEqualityComparer<K> comparer, string? errorContext = null)
         {
             Dictionary<K, T> result = new Dictionary<K, T>(comparer);
             result.AddRange(source, keySelector, v => v, errorContext ?? typeof(K).TypeName());
             return result;
         }
 
-        public static Dictionary<K, V> ToDictionaryEx<T, K, V>(this IEnumerable<T> source, Func<T, K> keySelector, Func<T, V> elementSelector, IEqualityComparer<K> comparer, string errorContext = null)
+        public static Dictionary<K, V> ToDictionaryEx<T, K, V>(this IEnumerable<T> source, Func<T, K> keySelector, Func<T, V> elementSelector, IEqualityComparer<K> comparer, string? errorContext = null)
         {
             Dictionary<K, V> result = new Dictionary<K, V>(comparer);
             result.AddRange(source, keySelector, elementSelector, errorContext ?? typeof(K).TypeName());
@@ -252,7 +252,7 @@ public static void JoinDictionaryForeachStrict<K, C, S>(
             }
         }
 
-        public static Dictionary<K, R> OuterJoinDictionaryCC<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1, V2, R> mixer)
+        public static Dictionary<K, R> OuterJoinDictionaryCC<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2?, R> mixer)
             where V1 : class
             where V2 : class
         {
@@ -263,7 +263,7 @@ public static Dictionary<K, R> OuterJoinDictionaryCC<K, V1, V2, R>(this IReadOnl
             return set.ToDictionaryEx(k => k, k => mixer(k, dic1.TryGetC(k), dic2.TryGetC(k)));
         }
 
-        public static Dictionary<K, R> OuterJoinDictionarySC<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2, R> mixer)
+        public static Dictionary<K, R> OuterJoinDictionarySC<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2?, R> mixer)
             where V1 : struct
             where V2 : class
         {
@@ -274,7 +274,7 @@ public static Dictionary<K, R> OuterJoinDictionarySC<K, V1, V2, R>(this IReadOnl
             return set.ToDictionaryEx(k => k, k => mixer(k, dic1.TryGetS(k), dic2.TryGetC(k)));
         }
 
-        public static Dictionary<K, V3> OuterJoinDictionarySC<K, V1, V2, V3>(this IReadOnlyDictionary<K, V1?> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2, V3> mixer)
+        public static Dictionary<K, V3> OuterJoinDictionarySC<K, V1, V2, V3>(this IReadOnlyDictionary<K, V1?> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2?, V3> mixer)
             where V1 : struct
             where V2 : class
         {
@@ -285,7 +285,7 @@ public static Dictionary<K, V3> OuterJoinDictionarySC<K, V1, V2, V3>(this IReadO
             return set.ToDictionaryEx(k => k, k => mixer(k, dic1.TryGetS(k), dic2.TryGetC(k)));
         }
 
-        public static Dictionary<K, R> OuterJoinDictionaryCS<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1, V2?, R> mixer)
+        public static Dictionary<K, R> OuterJoinDictionaryCS<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2?, R> mixer)
             where V1 : class
             where V2 : struct
         {
@@ -296,7 +296,7 @@ public static Dictionary<K, R> OuterJoinDictionaryCS<K, V1, V2, R>(this IReadOnl
             return set.ToDictionaryEx(k => k, k => mixer(k, dic1.TryGetC(k), dic2.TryGetS(k)));
         }
 
-        public static Dictionary<K, R> OuterJoinDictionaryCS<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2?> dic2, Func<K, V1, V2?, R> mixer)
+        public static Dictionary<K, R> OuterJoinDictionaryCS<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2?> dic2, Func<K, V1?, V2?, R> mixer)
             where V1 : class
             where V2 : struct
         {
@@ -462,14 +462,14 @@ public static Dictionary<K, V> Extract<K, V>(this IDictionary<K, V> dictionary,
         }
 
 
-        public static V Extract<K, V>(this IDictionary<K, V> dictionary, K key)
+        public static V Extract<K, V>(this IDictionary<K, V> dictionary, K key) where K : object
         {
             V value = dictionary.GetOrThrow(key);
             dictionary.Remove(key);
             return value;
         }
 
-        public static V Extract<K, V>(this IDictionary<K, V> dictionary, K key, string messageWithFormat)
+        public static V Extract<K, V>(this IDictionary<K, V> dictionary, K key, string messageWithFormat) where K : object
         {
             V value = dictionary.GetOrThrow(key, messageWithFormat);
             dictionary.Remove(key);
@@ -524,17 +524,17 @@ public static void Increment<K>(this IDictionary<K, int> dic, K key)
                 dic[key] = count + 1;
         }
 
-        public static NameValueCollection ToNameValueCollection<K, V>(this IDictionary<K, V> dic)
+        public static NameValueCollection ToNameValueCollection<K, V>(this IDictionary<K, V> dic) 
         {
             var collection = new NameValueCollection();
 
             foreach (var kvp in dic)
             {
-                string value = null;
+                string? value = null;
                 if (kvp.Value != null)
-                    value = kvp.Value.ToString();
+                    value = kvp.Value!.ToString();
 
-                collection.Add(kvp.Key.ToString(), value);
+                collection.Add(kvp.Key!.ToString(), value);
             }
 
             return collection;
diff --git a/Signum.Utilities/Extensions/EnumerableExtensions.cs b/Signum.Utilities/Extensions/EnumerableExtensions.cs
index 99e50569ea..21ac730b4a 100644
--- a/Signum.Utilities/Extensions/EnumerableExtensions.cs
+++ b/Signum.Utilities/Extensions/EnumerableExtensions.cs
@@ -52,7 +52,7 @@ public static T SingleEx<T>(this IEnumerable<T> collection, Func<T, bool> predic
             if (predicate == null)
                 throw new ArgumentNullException("predicate");
 
-            T result = default(T);
+            T result = default(T)!;
             bool found = false;
             foreach (T item in collection)
             {
@@ -165,7 +165,7 @@ public static T SingleOrDefaultEx<T>(this IEnumerable<T> collection, Func<T, boo
             if (predicate == null)
                 throw new ArgumentNullException("predicate");
 
-            T result = default(T);
+            T result = default(T)!;
             bool found = false;
             foreach (T item in collection)
             {
@@ -196,7 +196,7 @@ public static T SingleOrDefaultEx<T>(this IEnumerable<T> collection)
             using (IEnumerator<T> enumerator = collection.GetEnumerator())
             {
                 if (!enumerator.MoveNext())
-                    return default(T);
+                    return default(T)!;
 
                 T current = enumerator.Current;
 
@@ -215,7 +215,7 @@ public static T SingleOrDefaultEx<T>(this IEnumerable<T> collection, Func<string
             using (IEnumerator<T> enumerator = collection.GetEnumerator())
             {
                 if (!enumerator.MoveNext())
-                    return default(T);
+                    return default(T)!;
 
                 T current = enumerator.Current;
 
@@ -303,7 +303,7 @@ public static T SingleOrManyEx<T>(this IEnumerable<T> collection)
                 T current = enumerator.Current;
 
                 if (enumerator.MoveNext())
-                    return default(T);
+                    return default(T)!;
 
                 return current;
             }
@@ -322,7 +322,7 @@ public static T SingleOrManyEx<T>(this IEnumerable<T> collection, Func<string> e
                 T current = enumerator.Current;
 
                 if (enumerator.MoveNext())
-                    return default(T);
+                    return default(T)!;
 
                 return current;
             }
@@ -342,7 +342,7 @@ public static T SingleOrMany<T>(this IEnumerable<T> collection)
                 T current = enumerator.Current;
 
                 if (enumerator.MoveNext())
-                    return default(T);
+                    return default(T)!;
 
                 return current;
             }
@@ -357,12 +357,12 @@ public static T Only<T>(this IEnumerable<T> collection)
             using (IEnumerator<T> enumerator = collection.GetEnumerator())
             {
                 if (!enumerator.MoveNext())
-                    return default(T);
+                    return default(T)!;
 
                 T current = enumerator.Current;
 
                 if (enumerator.MoveNext())
-                    return default(T);
+                    return default(T)!;
 
                 return current;
             }
@@ -482,7 +482,7 @@ public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> collection, Random r
 
         public static string ToString<T>(this IEnumerable<T> source, string separator)
         {
-            StringBuilder sb = null;
+            StringBuilder? sb = null;
             foreach (var item in source)
             {
                 if (sb == null)
@@ -490,7 +490,7 @@ public static string ToString<T>(this IEnumerable<T> source, string separator)
                 else
                     sb.Append(separator);
 
-                sb.Append(item.ToString());
+                sb.Append(item!.ToString());
             }
 
             if (sb == null)
@@ -501,7 +501,7 @@ public static string ToString<T>(this IEnumerable<T> source, string separator)
 
         public static string ToString<T>(this IEnumerable<T> source, Func<T, string> toString, string separator)
         {
-            StringBuilder sb = null;
+            StringBuilder? sb = null;
             foreach (var item in source)
             {
                 if (sb == null)
@@ -525,7 +525,7 @@ public static string ToString<T>(this IQueryable<T> source, Expression<Func<T, s
 
         public static string CommaAnd<T>(this IEnumerable<T> collection)
         {
-            return CommaString(collection.Select(a => a.ToString()).ToArray(), CollectionMessage.And.NiceToString());
+            return CommaString(collection.Select(a => a!.ToString()).ToArray(), CollectionMessage.And.NiceToString());
         }
 
         public static string CommaAnd<T>(this IEnumerable<T> collection, Func<T, string> toString)
@@ -535,7 +535,7 @@ public static string CommaAnd<T>(this IEnumerable<T> collection, Func<T, string>
 
         public static string CommaOr<T>(this IEnumerable<T> collection)
         {
-            return CommaString(collection.Select(a => a.ToString()).ToArray(), CollectionMessage.Or.NiceToString());
+            return CommaString(collection.Select(a => a!.ToString()).ToArray(), CollectionMessage.Or.NiceToString());
         }
 
         public static string CommaOr<T>(this IEnumerable<T> collection, Func<T, string> toString)
@@ -545,7 +545,7 @@ public static string CommaOr<T>(this IEnumerable<T> collection, Func<T, string>
 
         public static string Comma<T>(this IEnumerable<T> collection, string lastSeparator)
         {
-            return CommaString(collection.Select(a => a.ToString()).ToArray(), lastSeparator);
+            return CommaString(collection.Select(a => a!.ToString()).ToArray(), lastSeparator);
         }
 
         public static string Comma<T>(this IEnumerable<T> collection, Func<T, string> toString, string lastSeparator)
@@ -578,7 +578,7 @@ static string CommaString(this string[] values, string lastSeparator)
 
         public static void ToConsole<T>(this IEnumerable<T> collection)
         {
-            ToConsole(collection, a => a.ToString());
+            ToConsole(collection, a => a!.ToString());
         }
 
         public static void ToConsole<T>(this IEnumerable<T> collection, Func<T, string> toString)
@@ -614,7 +614,7 @@ public static DataTable ToDataTable<T>(this IEnumerable<T> collection, bool with
                 table.Columns.Add(name, type);
             }
             foreach (var e in collection)
-                table.Rows.Add(members.Select(m => m.Getter(e)).ToArray());
+                table.Rows.Add(members.Select(m => m.Getter!(e)).ToArray());
             return table;
         }
 
@@ -663,7 +663,7 @@ static Type BetsCommonType(List<Type> list)
             foreach (var item in collection)
             {
                 for (int i = 0; i < members.Count; i++)
-                    result[i, j] = members[i].Getter(item)?.ToString() ?? "";
+                    result[i, j] = members[i].Getter!(item)?.ToString() ?? "";
                 j++;
             }
 
@@ -699,21 +699,21 @@ public static string FormatTable(this string[,] table, bool longHeaders = true,
             return 0.To(height).Select(j => 0.To(width).ToString(i => table[i, j].PadChopRight(lengths[i]), separator)).ToString("\r\n");
         }
 
-        public static void WriteFormattedStringTable<T>(this IEnumerable<T> collection, TextWriter textWriter, string title, bool longHeaders)
+        public static void WriteFormattedStringTable<T>(this IEnumerable<T> collection, TextWriter textWriter, string? title, bool longHeaders)
         {
             textWriter.WriteLine();
             if (title.HasText())
-                textWriter.WriteLine(title);
+                textWriter.WriteLine(title!);
             textWriter.WriteLine(collection.ToStringTable().FormatTable(longHeaders));
             textWriter.WriteLine();
         }
 
-        public static void ToConsoleTable<T>(this IEnumerable<T> collection, string title = null, bool longHeader = false)
+        public static void ToConsoleTable<T>(this IEnumerable<T> collection, string? title = null, bool longHeader = false)
         {
             collection.WriteFormattedStringTable(Console.Out, title, longHeader);
         }
 
-        public static string ToFormattedTable<T>(this IEnumerable<T> collection, string title = null, bool longHeader = false)
+        public static string ToFormattedTable<T>(this IEnumerable<T> collection, string? title = null, bool longHeader = false)
         {
             StringBuilder sb = new StringBuilder();
             using (StringWriter sw = new StringWriter(sb))
@@ -726,9 +726,9 @@ public static string ToFormattedTable<T>(this IEnumerable<T> collection, string
         public static T WithMin<T, V>(this IEnumerable<T> collection, Func<T, V> valueSelector)
           where V : IComparable<V>
         {
-            T result = default(T);
+            T result = default(T)!;
             bool hasMin = false;
-            V min = default(V);
+            V min = default(V)!;
             foreach (var item in collection)
             {
                 V val = valueSelector(item);
@@ -746,9 +746,9 @@ public static T WithMin<T, V>(this IEnumerable<T> collection, Func<T, V> valueSe
         public static T WithMax<T, V>(this IEnumerable<T> collection, Func<T, V> valueSelector)
                where V : IComparable<V>
         {
-            T result = default(T);
+            T result = default(T)!;
             bool hasMax = false;
-            V max = default(V);
+            V max = default(V)!;
 
             foreach (var item in collection)
             {
@@ -767,18 +767,18 @@ public static List<T> WithMinList<T, V>(this IEnumerable<T> collection, Func<T,
                where V : IComparable<V>
         {
             List<T> result = new List<T>();
-            V max = default(V);
+            V min = default(V)!;
 
             foreach (var item in collection)
             {
                 V val = valueSelector(item);
                 int comp = 0;
-                if (result.Count == 0 || (comp = val.CompareTo(max)) <= 0)
+                if (result.Count == 0 || (comp = val.CompareTo(min)) <= 0)
                 {
                     if (comp < 0)
                         result.Clear();
                     result.Add(item);
-                    max = val;
+                    min = val;
                 }
             }
             return result;
@@ -788,7 +788,7 @@ public static List<T> WithMaxList<T, V>(this IEnumerable<T> collection, Func<T,
                where V : IComparable<V>
         {
             List<T> result = new List<T>();
-            V max = default(V);
+            V max = default(V)!;
 
             foreach (var item in collection)
             {
@@ -808,9 +808,9 @@ public static List<T> WithMaxList<T, V>(this IEnumerable<T> collection, Func<T,
         public static MinMax<T> WithMinMaxPair<T, V>(this IEnumerable<T> collection, Func<T, V> valueSelector)
         where V : IComparable<V>
         {
-            T withMin = default(T), withMax = default(T);
+            T withMin = default(T)!, withMax = default(T)!;
             bool hasMin = false, hasMax = false;
-            V min = default(V), max = default(V);
+            V min = default(V)!, max = default(V)!;
             foreach (var item in collection)
             {
                 V val = valueSelector(item);
@@ -897,12 +897,37 @@ public static IEnumerable<T> Concat<T>(params IEnumerable<T>[] collections)
             }
         }
 
-        public static IEnumerable<S> BiSelect<T, S>(this IEnumerable<T> collection, Func<T, T, S> func)
+        public static IEnumerable<S> BiSelectC<T, S>(this IEnumerable<T> collection, Func<T?, T?, S> func, BiSelectOptions options = BiSelectOptions.None)
+            where T : class
         {
-            return BiSelect(collection, func, BiSelectOptions.None);
+            using (IEnumerator<T> enumerator = collection.GetEnumerator())
+            {
+                if (!enumerator.MoveNext())
+                    yield break;
+
+
+                T firstItem = enumerator.Current;
+                if (options == BiSelectOptions.Initial || options == BiSelectOptions.InitialAndFinal)
+                    yield return func(null, firstItem);
+
+                T lastItem = firstItem;
+                while (enumerator.MoveNext())
+                {
+                    T item = enumerator.Current;
+                    yield return func(lastItem, item);
+                    lastItem = item;
+                }
+
+                if (options == BiSelectOptions.Final || options == BiSelectOptions.InitialAndFinal)
+                    yield return func(lastItem, null);
+
+                if (options == BiSelectOptions.Circular)
+                    yield return func(lastItem, firstItem);
+            }
         }
 
-        public static IEnumerable<S> BiSelect<T, S>(this IEnumerable<T> collection, Func<T, T, S> func, BiSelectOptions options)
+        public static IEnumerable<S> BiSelectS<T, S>(this IEnumerable<T> collection, Func<T?, T?, S> func, BiSelectOptions options = BiSelectOptions.None)
+            where T : struct
         {
             using (IEnumerator<T> enumerator = collection.GetEnumerator())
             {
@@ -912,7 +937,7 @@ public static IEnumerable<S> BiSelect<T, S>(this IEnumerable<T> collection, Func
 
                 T firstItem = enumerator.Current;
                 if (options == BiSelectOptions.Initial || options == BiSelectOptions.InitialAndFinal)
-                    yield return func(default(T), firstItem);
+                    yield return func(null, firstItem);
 
                 T lastItem = firstItem;
                 while (enumerator.MoveNext())
@@ -923,7 +948,7 @@ public static IEnumerable<S> BiSelect<T, S>(this IEnumerable<T> collection, Func
                 }
 
                 if (options == BiSelectOptions.Final || options == BiSelectOptions.InitialAndFinal)
-                    yield return func(lastItem, default(T));
+                    yield return func(lastItem, null);
 
                 if (options == BiSelectOptions.Circular)
                     yield return func(lastItem, firstItem);
@@ -942,6 +967,7 @@ public static IEnumerable<S> SelectAggregate<T, S>(this IEnumerable<T> collectio
         }
 
         public static IEnumerable<IEnumerable<T>> CartesianProduct<T>(this IEnumerable<IEnumerable<T>> sequences)
+            where T : object
         {
             IEnumerable<ImmutableStack<T>> emptyProduct = new[] { ImmutableStack<T>.Empty };
             var result = sequences.Aggregate(
@@ -1005,8 +1031,8 @@ public static IEnumerable<R> ZipOrDefault<A, B, R>(this IEnumerable<A> colA, IEn
                 while (okA & (okA = enumA.MoveNext()) | okB & (okB = enumB.MoveNext()))
                 {
                     yield return resultSelector(
-                        okA ? enumA.Current : default(A),
-                        okB ? enumB.Current : default(B));
+                        okA ? enumA.Current : default(A)!,
+                        okB ? enumB.Current : default(B)!);
                 }
             }
         }
@@ -1020,8 +1046,8 @@ public static IEnumerable<R> ZipOrDefault<A, B, R>(this IEnumerable<A> colA, IEn
             {
                 while ((okA &= enumA.MoveNext()) || (okB &= enumB.MoveNext()))
                 {
-                    var first = okA ? enumA.Current : default(A);
-                    var second = okB ? enumB.Current : default(B);
+                    var first = okA ? enumA.Current : default(A)!;
+                    var second = okB ? enumB.Current : default(B)!;
 
                     yield return (first, second);
                 }
@@ -1125,11 +1151,10 @@ static EmptyReadOnlyDictionary()
             }
         }
 
-        public static ObservableCollection<T> ToObservableCollection<T>(this IEnumerable<T> collection)
+        public static ObservableCollection<T>? ToObservableCollection<T>(this IEnumerable<T>? collection)
         {
             return collection == null ? null :
-              collection as ObservableCollection<T> ??
-              new ObservableCollection<T>(collection);
+              collection as ObservableCollection<T> ?? new ObservableCollection<T>(collection);
         }
 
         public static IEnumerable<T> AsThreadSafe<T>(this IEnumerable<T> source)
@@ -1188,7 +1213,7 @@ public static IEnumerable<R> JoinStrict<K, C, S, R>(
             var extra = currentDictionary.Keys.Where(k => !shouldDictionary.ContainsKey(k)).ToList();
             var missing = shouldDictionary.Keys.Where(k => !currentDictionary.ContainsKey(k)).ToList();
 
-            string differences = GetDifferences(extra, missing);
+            string? differences = GetDifferences(extra, missing);
             if (differences != null)
             {
                 throw new InvalidOperationException($@"Mismatches {action}:
@@ -1212,7 +1237,7 @@ public static IEnumerable<R> JoinRelaxed<K, C, S, R>(
             var extra = currentDictionary.Keys.Where(k => !shouldDictionary.ContainsKey(k)).ToList();
             var missing = shouldDictionary.Keys.Where(k => !currentDictionary.ContainsKey(k)).ToList();
 
-            string differences = GetDifferences(extra, missing);
+            string? differences = GetDifferences(extra, missing);
             if (differences != null)
             {
                 try
@@ -1235,7 +1260,7 @@ public static IEnumerable<R> JoinRelaxed<K, C, S, R>(
             return commonKeys.Select(k => resultSelector(currentDictionary[k], shouldDictionary[k]));
         }
 
-        private static string GetDifferences<K>(List<K> extra, List<K> missing)
+        private static string? GetDifferences<K>(List<K> extra, List<K> missing)
         {
             if (extra.Count != 0)
             {
@@ -1296,7 +1321,7 @@ public static IEnumerable<Iteration<T>> Iterate<T>(this IEnumerable<T> collectio
             }
         }
 
-        public static List<T> Duplicates<T, K>(this IEnumerable<T> source, Func<T, K> selector, IEqualityComparer<K> comparer)
+        public static List<T> Duplicates<T, K>(this IEnumerable<T> source, Func<T, K> selector, IEqualityComparer<K>? comparer)
         {
             var hash = new HashSet<K>(comparer);
             return source.Where(item => !hash.Add(selector(item))).ToList();
@@ -1443,46 +1468,46 @@ public static class StandartDeviationExtensions
         public static double? StdDev<TSource>(this IEnumerable<TSource> source, Func<TSource, int> selector) => source.Select(selector).StdDev();
 
 
-        public static decimal? StdDev(this IQueryable<decimal> source) => source.Provider.Execute<decimal?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static decimal? StdDev(this IQueryable<decimal> source) => source.Provider.Execute<decimal?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDev(this IQueryable<double> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDev(this IQueryable<double> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDev(this IQueryable<int> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDev(this IQueryable<int> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDev(this IQueryable<long> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDev(this IQueryable<long> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static decimal? StdDev(this IQueryable<decimal?> source) => source.Provider.Execute<decimal?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static decimal? StdDev(this IQueryable<decimal?> source) => source.Provider.Execute<decimal?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDev(this IQueryable<double?> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDev(this IQueryable<double?> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDev(this IQueryable<int?> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDev(this IQueryable<int?> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDev(this IQueryable<long?> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDev(this IQueryable<long?> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static float? StdDev(this IQueryable<float> source) => source.Provider.Execute<float?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static float? StdDev(this IQueryable<float> source) => source.Provider.Execute<float?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static float? StdDev(this IQueryable<float?> source) => source.Provider.Execute<float?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static float? StdDev(this IQueryable<float?> source) => source.Provider.Execute<float?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
 
-        public static decimal? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal>> selector) => source.Provider.Execute<decimal?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static decimal? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal>> selector) => source.Provider.Execute<decimal?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static decimal? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal?>> selector) => source.Provider.Execute<decimal?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static decimal? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal?>> selector) => source.Provider.Execute<decimal?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static float? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float?>> selector) => source.Provider.Execute<float?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static float? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float?>> selector) => source.Provider.Execute<float?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static float? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float>> selector) => source.Provider.Execute<float?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static float? StdDev<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float>> selector) => source.Provider.Execute<float?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
     }
 
     /// <summary>
@@ -1558,45 +1583,45 @@ public static class StandartDeviationPopulationExtensions
         public static double? StdDevP<TSource>(this IEnumerable<TSource> source, Func<TSource, int> selector) => source.Select(selector).StdDevP();
 
 
-        public static decimal? StdDevP(this IQueryable<decimal> source) => source.Provider.Execute<decimal?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static decimal? StdDevP(this IQueryable<decimal> source) => source.Provider.Execute<decimal?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDevP(this IQueryable<double> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDevP(this IQueryable<double> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDevP(this IQueryable<int> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDevP(this IQueryable<int> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDevP(this IQueryable<long> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDevP(this IQueryable<long> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static decimal? StdDevP(this IQueryable<decimal?> source) => source.Provider.Execute<decimal?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static decimal? StdDevP(this IQueryable<decimal?> source) => source.Provider.Execute<decimal?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDevP(this IQueryable<double?> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDevP(this IQueryable<double?> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDevP(this IQueryable<int?> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDevP(this IQueryable<int?> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static double? StdDevP(this IQueryable<long?> source) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static double? StdDevP(this IQueryable<long?> source) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static float? StdDevP(this IQueryable<float> source) => source.Provider.Execute<float?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static float? StdDevP(this IQueryable<float> source) => source.Provider.Execute<float?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
-        public static float? StdDevP(this IQueryable<float?> source) => source.Provider.Execute<float?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
+        public static float? StdDevP(this IQueryable<float?> source) => source.Provider.Execute<float?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression));
 
 
-        public static decimal? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal>> selector) => source.Provider.Execute<decimal?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static decimal? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal>> selector) => source.Provider.Execute<decimal?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static decimal? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal?>> selector) => source.Provider.Execute<decimal?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static decimal? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal?>> selector) => source.Provider.Execute<decimal?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static double? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long?>> selector) => source.Provider.Execute<double?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static float? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float?>> selector) => source.Provider.Execute<float?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static float? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float?>> selector) => source.Provider.Execute<float?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
 
-        public static float? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float>> selector) => source.Provider.Execute<float?>(Expression.Call((Expression)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
+        public static float? StdDevP<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float>> selector) => source.Provider.Execute<float?>(Expression.Call((Expression?)null, (MethodInfo)MethodInfo.GetCurrentMethod(), source.Expression, Expression.Quote(selector)));
     }
 }
diff --git a/Signum.Utilities/Extensions/Extensions.cs b/Signum.Utilities/Extensions/Extensions.cs
index 9bf50b1551..df9b9c7ba4 100644
--- a/Signum.Utilities/Extensions/Extensions.cs
+++ b/Signum.Utilities/Extensions/Extensions.cs
@@ -350,9 +350,9 @@ public static IEnumerable<T> For<T>(this T start, Func<T, bool> condition, Func<
         public delegate R FuncCC<in T, R>(T input)
             where T : class
             where R : class;
-        public static IEnumerable<T> Follow<T>(this T start, FuncCC<T, T> next) where T : class
+        public static IEnumerable<T> Follow<T>(this T start, FuncCC<T, T?> next) where T : class
         {
-            for (T i = start; i != null; i = next(i))
+            for (T? i = start; i != null; i = next(i))
                 yield return i;
         }
 
diff --git a/Signum.Utilities/Extensions/StreamExtensions.cs b/Signum.Utilities/Extensions/StreamExtensions.cs
index 82ea54be73..6f2fb6c76b 100644
--- a/Signum.Utilities/Extensions/StreamExtensions.cs
+++ b/Signum.Utilities/Extensions/StreamExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Text;
 using System.IO;
 using System.Resources;
@@ -36,7 +36,7 @@ public static void WriteAllBytes(this Stream str, byte[] data)
             str.Write(data, 0, data.Length);
         }
 
-        public static string ReadResourceStream(this Assembly assembly, string name, Encoding encoding = null)
+        public static string ReadResourceStream(this Assembly assembly, string name, Encoding? encoding = null)
         {
             using (Stream stream = assembly.GetManifestResourceStream(name))
             {
diff --git a/Signum.Utilities/Extensions/StringExtensions.cs b/Signum.Utilities/Extensions/StringExtensions.cs
index 22f5c20ac9..691f92f8db 100644
--- a/Signum.Utilities/Extensions/StringExtensions.cs
+++ b/Signum.Utilities/Extensions/StringExtensions.cs
@@ -13,25 +13,25 @@ public static class StringExtensions
     {
         static readonly Expression<Func<string, bool>> HasTextExpression = str => (str ?? "").Length > 0;
         [ExpressionField("HasTextExpression")]
-        public static bool HasText(this string str)
+        public static bool HasText(this string? str)
         {
             return !string.IsNullOrEmpty(str);
         }
 
         static readonly Expression<Func<string, string, string>> DefaultTextExpression = (a, b) => ((a ?? "").Length > 0) ? a : b;
         [ExpressionField("DefaultTextExpression")]
-        public static string DefaultText(this string str, string defaultText)
+        public static string DefaultText(this string? str, string defaultText)
         {
             if (str.HasText())
-                return str;
+                return str!;
             else
                 return defaultText;
         }
 
-        public static string AssertHasText(this string str, string errorMessage)
+        public static string AssertHasText(this string? str, string errorMessage)
         {
             if (str.HasText())
-                return str;
+                return str!;
             else
                 throw new ArgumentException(errorMessage);
         }
@@ -41,7 +41,7 @@ public static bool Contains(this string source, string toCheck, StringComparison
             return source.IndexOf(toCheck, comp) >= 0;
         }
 
-        public static string Add(this string str, string separator, string part)
+        public static string? Add(this string? str, string separator, string? part)
         {
             if (str.HasText())
             {
@@ -54,7 +54,7 @@ public static string Add(this string str, string separator, string part)
                 return part;
         }
 
-        public static string AddLine(this string str, string part)
+        public static string? AddLine(this string? str, string part)
         {
             return Add(str, "\r\n", part);
         }
diff --git a/Signum.Utilities/NaturalLanguage/NaturalLanguageTools.cs b/Signum.Utilities/NaturalLanguage/NaturalLanguageTools.cs
index ad4c3d5b4d..b40e5148b9 100644
--- a/Signum.Utilities/NaturalLanguage/NaturalLanguageTools.cs
+++ b/Signum.Utilities/NaturalLanguage/NaturalLanguageTools.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Globalization;
@@ -28,12 +28,11 @@ public static class NaturalLanguageTools
             {"es", new SpanishNumberWriter()},
         };
 
-        public static char? GetGender(string name, CultureInfo culture = null)
+        public static char? GetGender(string name, CultureInfo? culture = null)
         {
-            if (culture == null)
-                culture = CultureInfo.CurrentUICulture;
+            var defCulture = culture ?? CultureInfo.CurrentUICulture;
 
-            IGenderDetector detector = GenderDetectors.TryGetC(culture.TwoLetterISOLanguageName);
+            var detector = GenderDetectors.TryGetC(defCulture.TwoLetterISOLanguageName);
 
             if (detector == null)
                 return null;
@@ -43,7 +42,7 @@ public static class NaturalLanguageTools
 
         public static bool HasGenders(CultureInfo cultureInfo)
         {
-            IGenderDetector detector = GenderDetectors.TryGetC(cultureInfo.TwoLetterISOLanguageName);
+            var detector = GenderDetectors.TryGetC(cultureInfo.TwoLetterISOLanguageName);
 
             if (detector == null)
                 return false;
@@ -51,12 +50,12 @@ public static bool HasGenders(CultureInfo cultureInfo)
             return !detector.Pronoms.IsNullOrEmpty();
         }
 
-        public static string GetPronom(char gender, bool plural, CultureInfo culture = null)
+        public static string? GetPronom(char gender, bool plural, CultureInfo? culture = null)
         {
             if (culture == null)
                 culture = CultureInfo.CurrentUICulture;
 
-            IGenderDetector detector = GenderDetectors.TryGetC(culture.TwoLetterISOLanguageName);
+            var detector = GenderDetectors.TryGetC(culture.TwoLetterISOLanguageName);
             if (detector == null)
                 return null;
 
@@ -68,12 +67,12 @@ public static string GetPronom(char gender, bool plural, CultureInfo culture = n
             return plural ? pro.Plural : pro.Singular;
         }
 
-        public static string Pluralize(string singularName, CultureInfo culture = null)
+        public static string Pluralize(string singularName, CultureInfo? culture = null)
         {
             if (culture == null)
                 culture = CultureInfo.CurrentUICulture;
 
-            IPluralizer pluralizer = Pluralizers.TryGetC(culture.TwoLetterISOLanguageName);
+            var pluralizer = Pluralizers.TryGetC(culture.TwoLetterISOLanguageName);
             if (pluralizer == null)
                 return singularName;
 
@@ -88,10 +87,9 @@ public static string NiceName(this string memberName)
               memberName.SpacePascal();
         }
 
-        public static string SpacePascal(this string pascalStr, CultureInfo culture = null)
+        public static string SpacePascal(this string pascalStr, CultureInfo? culture = null)
         {
-            if (culture == null)
-                culture = CultureInfo.CurrentUICulture;
+            var defCulture = culture ?? CultureInfo.CurrentUICulture;
 
             return SpacePascal(pascalStr, false);
         }
@@ -271,7 +269,9 @@ public class PronomInfo
         public string Singular { get; private set; }
         public string Plural { get; private set; }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
         public PronomInfo() { }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         public PronomInfo(char gender, string singular, string plural)
         {
diff --git a/Signum.Utilities/Polymorphic.cs b/Signum.Utilities/Polymorphic.cs
index 506a645e44..68315a3424 100644
--- a/Signum.Utilities/Polymorphic.cs
+++ b/Signum.Utilities/Polymorphic.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Collections.Concurrent;
@@ -9,12 +9,12 @@ namespace Signum.Utilities
 {
     public static class PolymorphicMerger
     {
-        public static T Inheritance<T>(KeyValuePair<Type, T> currentValue, KeyValuePair<Type, T> baseValue, List<KeyValuePair<Type, T>> newInterfacesValues) where T : class
+        public static T? Inheritance<T>(KeyValuePair<Type, T?> currentValue, KeyValuePair<Type, T?> baseValue, List<KeyValuePair<Type, T?>> newInterfacesValues) where T : class
         {
             return currentValue.Value ?? baseValue.Value;
         }
 
-        public static T InheritanceAndInterfaces<T>(KeyValuePair<Type, T> currentValue, KeyValuePair<Type, T> baseValue, List<KeyValuePair<Type, T>> newInterfacesValues) where T : class
+        public static T? InheritanceAndInterfaces<T>(KeyValuePair<Type, T?> currentValue, KeyValuePair<Type, T?> baseValue, List<KeyValuePair<Type, T?>> newInterfacesValues) where T : class
         {
             var result = currentValue.Value ?? baseValue.Value;
 
@@ -29,7 +29,7 @@ public static T InheritanceAndInterfaces<T>(KeyValuePair<Type, T> currentValue,
             return conflicts.Select(a => a.Value).SingleOrDefaultEx();
         }
 
-        public static Dictionary<K, V> InheritDictionary<K, V>(KeyValuePair<Type, Dictionary<K, V>> currentValue, KeyValuePair<Type, Dictionary<K, V>> baseValue, List<KeyValuePair<Type, Dictionary<K, V>>> newInterfacesValues)
+        public static Dictionary<K, V>? InheritDictionary<K, V>(KeyValuePair<Type, Dictionary<K, V>?> currentValue, KeyValuePair<Type, Dictionary<K, V>?> baseValue, List<KeyValuePair<Type, Dictionary<K, V>?>> newInterfacesValues)
         {
             if (currentValue.Value == null && baseValue.Value == null)
                 return null;
@@ -37,15 +37,16 @@ public static Dictionary<K, V> InheritDictionary<K, V>(KeyValuePair<Type, Dictio
             Dictionary<K, V> newDictionary = new Dictionary<K, V>();
 
             if (baseValue.Value != null)
-                newDictionary.AddRange(baseValue.Value);
+                newDictionary.AddRange(baseValue.Value!);
 
             if (currentValue.Value != null)
-                newDictionary.SetRange(currentValue.Value);
+                newDictionary.SetRange(currentValue.Value!);
 
             return newDictionary;
         }
 
-        public static Dictionary<K, V> InheritDictionaryInterfaces<K, V>(KeyValuePair<Type, Dictionary<K, V>> currentValue, KeyValuePair<Type, Dictionary<K, V>> baseValue, List<KeyValuePair<Type, Dictionary<K, V>>> newInterfacesValues)
+        public static Dictionary<K, V>? InheritDictionaryInterfaces<K, V>(KeyValuePair<Type, Dictionary<K, V>?> currentValue, KeyValuePair<Type, Dictionary<K, V>?> baseValue, List<KeyValuePair<Type, Dictionary<K, V>?>> newInterfacesValues)
+            where K : Object
         {
             if (currentValue.Value == null && baseValue.Value == null && newInterfacesValues.All(a => a.Value == null))
                 return null;
@@ -53,22 +54,22 @@ public static Dictionary<K, V> InheritDictionaryInterfaces<K, V>(KeyValuePair<Ty
             Dictionary<K, V> newDictionary = new Dictionary<K, V>();
 
             if (baseValue.Value != null)
-                newDictionary.AddRange(baseValue.Value);
+                newDictionary.AddRange(baseValue.Value!);
 
             if (currentValue.Value != null)
-                newDictionary.SetRange(currentValue.Value);
+                newDictionary.SetRange(currentValue.Value!);
 
-            var interfaces = newInterfacesValues.Where(a => a.Value != null);
+            var interfaces = newInterfacesValues.Where(a => a.Value != null) as IEnumerable<KeyValuePair<Type, Dictionary<K, V>>>;
 
             var keys = interfaces.SelectMany(inter => inter.Value.Keys).Distinct().Except(newDictionary.Keys);
 
             foreach (var item in keys)
             {
-                var types = interfaces.Where(a => a.Value.ContainsKey(item)).Select(a => new { a.Key, Value = a.Value[item] }).ToList();
+                var types = interfaces.Where(a => a.Value!.ContainsKey(item)).Select(a => new { a.Key, Value = a.Value![item] }).ToList();
 
                 var groups = types.GroupBy(t => t.Value);
                 if (groups.Count() > 1)
-                    throw new InvalidOperationException("Ambiguity for key {0} in type {0} between interfaces {1}".FormatWith(item, currentValue.Key.Name, types.CommaAnd(t => t.Key.Name)));
+                    throw new InvalidOperationException("Ambiguity for key {0} in type {0} between interfaces {1}".FormatWith(item, currentValue.Key.Name, types.CommaAnd(t => t.Key!.Name)));
 
                 newDictionary[item] = groups.Single().Key;
             }
@@ -77,15 +78,15 @@ public static Dictionary<K, V> InheritDictionaryInterfaces<K, V>(KeyValuePair<Ty
         }
     }
 
-    public delegate T PolymorphicMerger<T>(KeyValuePair<Type, T> currentValue, KeyValuePair<Type, T> baseValue, List<KeyValuePair<Type, T>> newInterfacesValues) where T : class;
+    public delegate T? PolymorphicMerger<T>(KeyValuePair<Type, T?> currentValue, KeyValuePair<Type, T?> baseValue, List<KeyValuePair<Type, T?>> newInterfacesValues) where T : class;
 
     public class Polymorphic<T> where T : class
     {
         Dictionary<Type, T> definitions = new Dictionary<Type, T>();
-        ConcurrentDictionary<Type, T> cached = new ConcurrentDictionary<Type, T>();
+        ConcurrentDictionary<Type, T?> cached = new ConcurrentDictionary<Type, T?>();
 
         PolymorphicMerger<T> merger;
-        Type minimumType;
+        Type? minimumType;
 
 
        public bool ContainsKey(Type type)
@@ -102,16 +103,16 @@ bool IsAllowed(Type type)
         void AssertAllowed(Type type)
         {
             if (!IsAllowed(type))
-                throw new InvalidOperationException("{0} is not a {1}".FormatWith(type.Name, minimumType.Name));
+                throw new InvalidOperationException("{0} is not a {1}".FormatWith(type.Name, minimumType!.Name));
         }
 
-        public Polymorphic(PolymorphicMerger<T> merger = null, Type minimumType = null)
+        public Polymorphic(PolymorphicMerger<T>? merger = null, Type? minimumType = null)
         {
             this.merger = merger ?? PolymorphicMerger.Inheritance<T>;
             this.minimumType = minimumType ?? GetDefaultType(typeof(T));
         }
 
-        private static Type GetDefaultType(Type type)
+        private static Type? GetDefaultType(Type type)
         {
             if (!typeof(Delegate).IsAssignableFrom(type))
                 return null;
@@ -136,23 +137,23 @@ public T GetValue(Type type)
             return result;
         }
 
-        public T TryGetValue(Type type)
+        public T? TryGetValue(Type type)
         {
             AssertAllowed(type);
 
             return cached.GetOrAdd(type, TryGetValueInternal);
         }
 
-        public T GetDefinition(Type type)
+        public T? GetDefinition(Type type)
         {
             AssertAllowed(type);
 
             return definitions.TryGetC(type);
         }
 
-        T TryGetValueInternal(Type type)
+        T? TryGetValueInternal(Type type)
         {
-            if (cached.TryGetValue(type, out T result))
+            if (cached.TryGetValue(type, out T? result))
                 return result;
 
             var baseValue = type.BaseType == null || !IsAllowed(type.BaseType) ? null : TryGetValue(type.BaseType);
@@ -160,7 +161,7 @@ T TryGetValueInternal(Type type)
             var currentValue = definitions.TryGetC(type);
 
             if (minimumType != null && !minimumType.IsInterface)
-                return merger(KVP.Create(type, currentValue), KVP.Create(type.BaseType, baseValue), null);
+                return merger(KVP.Create(type, currentValue), KVP.Create(type.BaseType, baseValue), new List<KeyValuePair<Type, T?>>());
 
             IEnumerable<Type> interfaces = type.GetInterfaces().Where(IsAllowed);
 
@@ -211,7 +212,7 @@ public static class PolymorphicExtensions
     {
         public static T GetOrAddDefinition<T>(this Polymorphic<T> polymorphic, Type type) where T : class, new()
         {
-            T value = polymorphic.GetDefinition(type);
+            T? value = polymorphic.GetDefinition(type);
 
             if (value != null)
                 return value;
@@ -276,31 +277,31 @@ public static void Register<T, S, P0, P1, P2, P3, R>(this Polymorphic<Func<T, P0
         }
 
 
-        public static void Invoke<T>(this Polymorphic<Action<T>> polymorphic, T instance)
+        public static void Invoke<T>(this Polymorphic<Action<T>> polymorphic, T instance) where T : object
         {
             var action = polymorphic.GetValue(instance.GetType());
             action(instance);
         }
 
-        public static void Invoke<T, P0>(this Polymorphic<Action<T, P0>> polymorphic, T instance, P0 p0)
+        public static void Invoke<T, P0>(this Polymorphic<Action<T, P0>> polymorphic, T instance, P0 p0) where T : object
         {
             var action = polymorphic.GetValue(instance.GetType());
             action(instance, p0);
         }
 
-        public static void Invoke<T, P0, P1>(this Polymorphic<Action<T, P0, P1>> polymorphic, T instance, P0 p0, P1 p1)
+        public static void Invoke<T, P0, P1>(this Polymorphic<Action<T, P0, P1>> polymorphic, T instance, P0 p0, P1 p1) where T : object
         {
             var action = polymorphic.GetValue(instance.GetType());
             action(instance, p0, p1);
         }
 
-        public static void Invoke<T, P0, P1, P2>(this Polymorphic<Action<T, P0, P1, P2>> polymorphic, T instance, P0 p0, P1 p1, P2 p2)
+        public static void Invoke<T, P0, P1, P2>(this Polymorphic<Action<T, P0, P1, P2>> polymorphic, T instance, P0 p0, P1 p1, P2 p2) where T : object
         {
             var action = polymorphic.GetValue(instance.GetType());
             action(instance, p0, p1, p2);
         }
 
-        public static void Invoke<T, P0, P1, P2, P3>(this Polymorphic<Action<T, P0, P1, P2, P3>> polymorphic, T instance, P0 p0, P1 p1, P2 p2, P3 p3)
+        public static void Invoke<T, P0, P1, P2, P3>(this Polymorphic<Action<T, P0, P1, P2, P3>> polymorphic, T instance, P0 p0, P1 p1, P2 p2, P3 p3) where T : object
         {
             var action = polymorphic.GetValue(instance.GetType());
             action(instance, p0, p1, p2, p3);
@@ -308,31 +309,31 @@ public static void Invoke<T, P0, P1, P2, P3>(this Polymorphic<Action<T, P0, P1,
 
 
 
-        public static R Invoke<T, R>(this Polymorphic<Func<T, R>> polymorphic, T instance)
+        public static R Invoke<T, R>(this Polymorphic<Func<T, R>> polymorphic, T instance) where T : object
         {
             var func = polymorphic.GetValue(instance.GetType());
             return func(instance);
         }
 
-        public static R Invoke<T, P0, R>(this Polymorphic<Func<T, P0, R>> polymorphic, T instance, P0 p0)
+        public static R Invoke<T, P0, R>(this Polymorphic<Func<T, P0, R>> polymorphic, T instance, P0 p0) where T : object
         {
             var func = polymorphic.GetValue(instance.GetType());
             return func(instance, p0);
         }
 
-        public static R Invoke<T, P0, P1, R>(this Polymorphic<Func<T, P0, P1, R>> polymorphic, T instance, P0 p0, P1 p1)
+        public static R Invoke<T, P0, P1, R>(this Polymorphic<Func<T, P0, P1, R>> polymorphic, T instance, P0 p0, P1 p1) where T : object
         {
             var func = polymorphic.GetValue(instance.GetType());
             return func(instance, p0, p1);
         }
 
-        public static R Invoke<T, P0, P1, P2, R>(this Polymorphic<Func<T, P0, P1, P2, R>> polymorphic, T instance, P0 p0, P1 p1, P2 p2)
+        public static R Invoke<T, P0, P1, P2, R>(this Polymorphic<Func<T, P0, P1, P2, R>> polymorphic, T instance, P0 p0, P1 p1, P2 p2) where T : object
         {
             var func = polymorphic.GetValue(instance.GetType());
             return func(instance, p0, p1, p2);
         }
 
-        public static R Invoke<T, P0, P1, P2, P3, R>(this Polymorphic<Func<T, P0, P1, P2, P3, R>> polymorphic, T instance, P0 p0, P1 p1, P2 p2, P3 p3)
+        public static R Invoke<T, P0, P1, P2, P3, R>(this Polymorphic<Func<T, P0, P1, P2, P3, R>> polymorphic, T instance, P0 p0, P1 p1, P2 p2, P3 p3) where T : object
         {
             var func = polymorphic.GetValue(instance.GetType());
             return func(instance, p0, p1, p2, p3);
diff --git a/Signum.Utilities/Profiler/HeavyProfiler.cs b/Signum.Utilities/Profiler/HeavyProfiler.cs
index b8a3dfdf84..318656564b 100644
--- a/Signum.Utilities/Profiler/HeavyProfiler.cs
+++ b/Signum.Utilities/Profiler/HeavyProfiler.cs
@@ -47,7 +47,7 @@ public static void Clean()
             }
         }
 
-        public static Tracer Log(string role)
+        public static Tracer? Log(string role)
         {
             if (!enabled)
                 return null;
@@ -57,7 +57,7 @@ public static Tracer Log(string role)
             return tracer;
         }
 
-        public static Tracer Log(string role, Func<string> additionalData)
+        public static Tracer? Log(string role, Func<string> additionalData)
         {
             if (!enabled)
                 return null;
@@ -67,7 +67,7 @@ public static Tracer Log(string role, Func<string> additionalData)
             return tracer;
         }
 
-        public static Tracer LogNoStackTrace(string role)
+        public static Tracer? LogNoStackTrace(string role)
         {
             if (!enabled)
                 return null;
@@ -77,7 +77,7 @@ public static Tracer LogNoStackTrace(string role)
             return tracer;
         }
 
-        public static Tracer LogNoStackTrace(string role, Func<string> additionalData)
+        public static Tracer? LogNoStackTrace(string role, Func<string> additionalData)
         {
             if (!enabled)
                 return null;
@@ -109,7 +109,7 @@ public static T LogValueNoStackTrace<T>(string role, Func<T> valueFactory)
             }
         }
 
-        private static Tracer CreateNewEntry(string role, Func<string> additionalData, bool stackTrace)
+        private static Tracer? CreateNewEntry(string role, Func<string>? additionalData, bool stackTrace)
         {
             long beforeStart = PerfCounter.Ticks;
          
@@ -161,8 +161,8 @@ private static Tracer CreateNewEntry(string role, Func<string> additionalData, b
 
         public class Tracer : IDisposable
         {
-            internal HeavyProfilerEntry newCurrent;
-
+            internal HeavyProfilerEntry? newCurrent;
+            
             public void Dispose()
             {
                 if (newCurrent == null) //After a Switch sequence disabled in the middle
@@ -180,7 +180,7 @@ public void Dispose()
             }
         }
 
-        public static void Switch(this Tracer tracer, string role, Func<string> additionalData = null)
+        public static void Switch(this Tracer tracer, string role, Func<string>? additionalData = null)
         {
             if (tracer == null)
                 return;
@@ -279,7 +279,7 @@ public static HeavyProfilerEntry Find(string fullIndex)
         {
             var array = fullIndex.Split('-').Select(a => int.Parse(a)).ToArray();
 
-            HeavyProfilerEntry entry = null;
+            HeavyProfilerEntry? entry = null;
 
             List<HeavyProfilerEntry> currentList = Signum.Utilities.HeavyProfiler.Entries;
 
@@ -295,7 +295,7 @@ public static HeavyProfilerEntry Find(string fullIndex)
                 currentList = entry.Entries;
             }
 
-            return entry;
+            return entry!;
         }
     }
 
@@ -303,7 +303,7 @@ public static HeavyProfilerEntry Find(string fullIndex)
     public class HeavyProfilerEntry
     {
         public List<HeavyProfilerEntry> Entries;
-        public HeavyProfilerEntry Parent; 
+        public HeavyProfilerEntry? Parent; 
         public string Role;
 
         public int Index;
@@ -315,7 +315,7 @@ public string FullIndex()
             return this.Follow(a => a.Parent).Reverse().ToString(a => a.Index.ToString(), "-");
         }
 
-        public string AdditionalData;
+        public string? AdditionalData;
         public string AdditionalDataPreview()
         {
             if (string.IsNullOrEmpty(AdditionalData))
@@ -329,8 +329,8 @@ public string AdditionalDataPreview()
         public long? End;
         public long EndOrNow => End ?? PerfCounter.Ticks;
 
-        public StackTrace StackTrace;
-        public List<ExternalStackTrace> ExternalStackTrace;
+        public StackTrace? StackTrace;
+        public List<ExternalStackTrace>? ExternalStackTrace;
 
         public TimeSpan Elapsed
         {
@@ -445,7 +445,7 @@ public void CleanStackTrace()
                     item.CleanStackTrace();
         }
 
-        internal static HeavyProfilerEntry ImportXml(XElement xLog, HeavyProfilerEntry parent)
+        internal static HeavyProfilerEntry ImportXml(XElement xLog, HeavyProfilerEntry? parent = null)
         {
             var result = new HeavyProfilerEntry
             {
diff --git a/Signum.Utilities/SafeConsole.cs b/Signum.Utilities/SafeConsole.cs
index f22f2451cf..f29af664a0 100644
--- a/Signum.Utilities/SafeConsole.cs
+++ b/Signum.Utilities/SafeConsole.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.InteropServices;
@@ -22,7 +22,7 @@ public static void WriteSameLine(string str)
             if (needToClear)
                 str = str.PadChopRight(Console.BufferWidth - 1);
             else
-                str = str.TryStart(Console.BufferWidth - 1);
+                str = str.TryStart(Console.BufferWidth - 1)!;
 
             Console.WriteLine(str);
 
@@ -78,14 +78,14 @@ public static void WriteSameLineColor(ConsoleColor color, string str)
             Console.ForegroundColor = old;
         }
 
-        public static string AskString(string question, Func<string, string> stringValidator = null)
+        public static string AskString(string question, Func<string, string?>? stringValidator = null)
         {
             Console.Write(question);
             do
             {
                 var userAnswer = Console.ReadLine();
 
-                string error = stringValidator == null ? null : stringValidator(userAnswer);
+                string? error = stringValidator == null ? null : stringValidator(userAnswer);
                 if (error == null)
                     return userAnswer;
 
@@ -112,7 +112,7 @@ public static string Ask(string question, params string[] answers)
             } while (true);
         }
 
-        public static string AskMultiLine(string question, params string[] answers)
+        public static string? AskMultiLine(string question, params string[] answers)
         {
             Console.WriteLine(question);
 
@@ -147,7 +147,7 @@ public static bool Ask(ref bool? rememberedAnswer, string question)
             if (rememberedAnswer != null)
                 return rememberedAnswer.Value;
 
-            string answerString = null;
+            string? answerString = null;
 
             string result = Ask(ref answerString, question, "yes", "no");
 
@@ -157,7 +157,7 @@ public static bool Ask(ref bool? rememberedAnswer, string question)
             return result == "yes";
         }
 
-        public static string Ask(ref string rememberedAnswer, string question, params string[] answers)
+        public static string Ask(ref string? rememberedAnswer, string question, params string[] answers)
         {
             if (rememberedAnswer != null)
                 return rememberedAnswer;
@@ -186,7 +186,7 @@ public static string Ask(ref string rememberedAnswer, string question, params st
             }
         }
 
-        public static string AskSwitch(string question, List<string> options)
+        public static string? AskSwitch(string question, List<string> options)
         {
             var cs = new ConsoleSwitch<int, string>(question);
 
@@ -215,7 +215,7 @@ public static int WaitRows(string startingText, Func<int> updateOrDelete)
 
         public static T WaitQuery<T>(string startingText, Func<T> query)
         {
-            T result = default(T);
+            T result = default(T)!;
             SafeConsole.WriteColor(ConsoleColor.Yellow, startingText);
             WaitExecute(() => { result = query(); Console.WriteLine(); });
             return result;
diff --git a/Signum.Utilities/Signum.Utilities.csproj b/Signum.Utilities/Signum.Utilities.csproj
index 9bdbe60fcb..eadfd1b5af 100644
--- a/Signum.Utilities/Signum.Utilities.csproj
+++ b/Signum.Utilities/Signum.Utilities.csproj
@@ -9,6 +9,10 @@
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <NoWarn>1701;1702;8618</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <None Update="Translations\*.xml">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
diff --git a/Signum.Utilities/Statics.cs b/Signum.Utilities/Statics.cs
index 8a06333418..10d2eb62bf 100644
--- a/Signum.Utilities/Statics.cs
+++ b/Signum.Utilities/Statics.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
@@ -17,7 +17,7 @@ public static ThreadVariable<T> ThreadVariable<T>(string name, bool avoidExportI
             return variable;
         }
        
-        public static Dictionary<string, object> ExportThreadContext(bool force = false)
+        public static Dictionary<string, object?> ExportThreadContext(bool force = false)
         {
             return threadVariables.Where(t => !t.Value.IsClean && (!t.Value.AvoidExportImport || force)).ToDictionaryEx(kvp => kvp.Key, kvp => kvp.Value.UntypedValue);
         }
@@ -82,7 +82,7 @@ public static ISessionFactory SessionFactory
     public interface IUntypedVariable
     {
         string Name { get; }
-        object UntypedValue { get; set; }
+        object? UntypedValue { get; set; }
         bool IsClean {get;}
         void Clean();
     }
@@ -98,7 +98,7 @@ public Variable(string name)
 
         public abstract T Value { get; set; }
 
-        public object UntypedValue
+        public object? UntypedValue
         {
             get { return Value; }
             set { Value = (T)value; }
@@ -152,13 +152,13 @@ public override T Value
 
         public override void Clean()
         {
-            Value = default(T);
+            Value = default(T)!;
         }
     }
 
     public abstract class SessionVariable<T>: Variable<T>
     {
-        public abstract Func<T> ValueFactory { get; set; }
+        public abstract Func<T>? ValueFactory { get; set; }
 
         protected internal SessionVariable(string name)
             : base(name)
@@ -168,7 +168,7 @@ protected internal SessionVariable(string name)
         public T GetDefaulValue()
         {
             if (ValueFactory == null)
-                return default(T);
+                return default(T)!;
 
             Value = ValueFactory();
 
@@ -191,15 +191,16 @@ public SessionVariable<T> CreateVariable<T>(string name)
 
         class VoidVariable<T> : SessionVariable<T>
         {
-            public override Func<T> ValueFactory { get; set; }
+            public override Func<T>? ValueFactory { get; set; }
 
             public VoidVariable(string name)
                 : base(name)
-            { }
+            {
+            }
 
             public override T Value
             {
-                get { return default(T); }
+                get { return default(T)!; }
                 set { throw new InvalidOperationException("No session found to set '{0}'".FormatWith(this.Name)); ; }
             }
 
@@ -211,9 +212,9 @@ public override void Clean()
 
     public class SingletonSessionFactory : ISessionFactory
     {
-        public static Dictionary<string, object> singletonSession = new Dictionary<string, object>();
+        public static Dictionary<string, object?> singletonSession = new Dictionary<string, object?>();
 
-        public static Dictionary<string, object> SingletonSession
+        public static Dictionary<string, object?> SingletonSession
         {
             get { return singletonSession; }
             set { singletonSession = value; }
@@ -226,8 +227,8 @@ public SessionVariable<T> CreateVariable<T>(string name)
 
         class SingletonVariable<T> : SessionVariable<T>
         {
-            public override Func<T> ValueFactory { get; set; }
-            
+            public override Func<T>? ValueFactory { get; set; }
+
             public SingletonVariable(string name)
                 : base(name)
             { }
@@ -236,7 +237,7 @@ public override T Value
             {
                 get
                 {
-                    if (singletonSession.TryGetValue(Name, out object result))
+                    if (singletonSession.TryGetValue(Name, out object? result))
                         return (T)result;
 
                     return GetDefaulValue();
@@ -255,7 +256,7 @@ public class ScopeSessionFactory : ISessionFactory
     {
         public ISessionFactory Factory;
 
-        static readonly ThreadVariable<Dictionary<string, object>> overridenSession = Statics.ThreadVariable<Dictionary<string, object>>("overridenSession");
+        static readonly ThreadVariable<Dictionary<string, object?>> overridenSession = Statics.ThreadVariable<Dictionary<string, object?>>("overridenSession");
 
         public static bool IsOverriden
         {
@@ -269,10 +270,10 @@ public ScopeSessionFactory(ISessionFactory factory)
 
         public static IDisposable OverrideSession()
         {
-            return OverrideSession(new Dictionary<string, object>());
+            return OverrideSession(new Dictionary<string, object?>());
         }
 
-        public static IDisposable OverrideSession(Dictionary<string, object> sessionDictionary)
+        public static IDisposable OverrideSession(Dictionary<string, object?> sessionDictionary)
         {
             if (!(Statics.SessionFactory is ScopeSessionFactory))
                 throw new InvalidOperationException("Impossible to OverrideSession because Statics.SessionFactory is not a ScopeSessionFactory"); 
@@ -296,7 +297,7 @@ public OverrideableVariable(SessionVariable<T> variable)
                 this.variable = variable;
             }
 
-            public override Func<T> ValueFactory
+            public override Func<T>? ValueFactory
             {
                 get { return variable.ValueFactory; }
                 set { variable.ValueFactory = value; }
@@ -310,7 +311,7 @@ public override T Value
 
                     if (dic != null)
                     {
-                        if (dic.TryGetValue(Name, out object result))
+                        if (dic.TryGetValue(Name, out object? result))
                             return (T)result;
 
                         return GetDefaulValue();

From 766882852e41814b9cfd13909770e4af750cda53 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Tue, 8 Jan 2019 08:06:25 +0100
Subject: [PATCH 05/25] not nullable entities

---
 Signum.Entities/DynamicQuery/ResultTable.cs   | 56 ++++++++---------
 .../DynamicQuery/Tokens/QueryToken.cs         |  4 +-
 Signum.Entities/Entity.cs                     | 18 +++---
 Signum.Entities/FieldAttributes.cs            | 26 ++++----
 Signum.Entities/ModifiableEntity.cs           | 62 +++++++++----------
 Signum.Entities/Patterns/ImmutableEntity.cs   |  8 +--
 Signum.Entities/Signum.Entities.csproj        |  4 +-
 .../Extensions/StringExtensions.cs            |  6 +-
 8 files changed, 90 insertions(+), 94 deletions(-)

diff --git a/Signum.Entities/DynamicQuery/ResultTable.cs b/Signum.Entities/DynamicQuery/ResultTable.cs
index dbdaa06082..890d29c83e 100644
--- a/Signum.Entities/DynamicQuery/ResultTable.cs
+++ b/Signum.Entities/DynamicQuery/ResultTable.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -36,6 +36,7 @@ public ResultColumn(Column column, IList values)
         }
 
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
         ResultColumn(SerializationInfo info, StreamingContext context)
         {
             foreach (SerializationEntry entry in info)
@@ -48,6 +49,7 @@ public ResultColumn(Column column, IList values)
                 }
             }
         }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         GenericInvoker<Func<int, IList>> listBuilder = new GenericInvoker<Func<int, IList>>(num => new List<int>(num));
 
@@ -73,7 +75,7 @@ public void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             info.AddValue("column", column);
 
-            Func<object, string> serializer = GetValueSerializer();
+            Func<object, string>? serializer = GetValueSerializer();
 
             if (serializer == null)
                 info.AddValue("valuesList", values);
@@ -138,7 +140,7 @@ Func<string, object> GetValueDeserializer()
             throw new InvalidOperationException("Impossible to deserialize a ResultColumn of {0}".FormatWith(column.Type));
         }
 
-        Func<object, string> GetValueSerializer()
+        Func<object, string>? GetValueSerializer()
         {
             if (column.Type.IsLite())
             {
@@ -217,7 +219,7 @@ static object DeserializeLite(string str, Type defaultEntityType)
     public class ResultTable
     {
         internal ResultColumn entityColumn;
-        public ColumnDescription EntityColumn
+        public ColumnDescription? EntityColumn
         {
             get { return entityColumn == null ? null : ((ColumnToken)entityColumn.Column.Token).Column; }
         }
@@ -239,7 +241,10 @@ public ResultTable(ResultColumn[] columns, int? totalElements, Pagination pagina
             this.entityColumn = columns.Where(c => c.Column is _EntityColumn).SingleOrDefaultEx();
             this.columns = columns.Where(c => !(c.Column is _EntityColumn) && c.Column.Token.IsAllowed() == null).ToArray();
 
-            CreateIndices(columns);
+            int rowCount = columns.Select(a => a.Values.Count).Distinct().SingleEx(() => "Count");
+            for (int i = 0; i < Columns.Length; i++)
+                Columns[i].Index = i;
+            this.rows = 0.To(rowCount).Select(i => new ResultRow(i, this)).ToArray();
 
             this.totalElements = totalElements;
             this.pagination = pagination;
@@ -251,34 +256,23 @@ public ResultTable(ResultColumn[] columns, int? totalElements, Pagination pagina
         //    CreateIndices(columns);
         //}
 
-        void CreateIndices(ResultColumn[] columns)
-        {
-            int rows = columns.Select(a => a.Values.Count).Distinct().SingleEx(() => "Count");
-
-            for (int i = 0; i < Columns.Length; i++)
-                Columns[i].Index = i;
-
-            this.rows = 0.To(rows).Select(i => new ResultRow(i, this)).ToArray();
-        }
-
-        public DataTable ToDataTable(DataTableValueConverter converter = null)
+        
+        public DataTable ToDataTable(DataTableValueConverter? converter = null)
         {
-            if (converter == null)
-                converter = new InvariantDataTableValueConverter();
+            var defConverter = converter ?? new InvariantDataTableValueConverter();
 
             DataTable dt = new DataTable("Table");
-            dt.Columns.AddRange(Columns.Select(c => new DataColumn(c.Column.Name, converter.ConvertType(c.Column))).ToArray());
+            dt.Columns.AddRange(Columns.Select(c => new DataColumn(c.Column.Name, defConverter.ConvertType(c.Column))).ToArray());
             foreach (var row in Rows)
             {
-                dt.Rows.Add(Columns.Select((c, i) => converter.ConvertValue(row[i], c.Column)).ToArray());
+                dt.Rows.Add(Columns.Select((c, i) => defConverter.ConvertValue(row[i], c.Column)).ToArray());
             }
             return dt;
         }
 
-        public DataTable ToDataTablePivot(int rowColumnIndex, int columnColumnIndex, int valueIndex, DataTableValueConverter converter = null)
+        public DataTable ToDataTablePivot(int rowColumnIndex, int columnColumnIndex, int valueIndex, DataTableValueConverter? converter = null)
         {
-            if (converter != null)
-                converter = new InvariantDataTableValueConverter();
+            var defConverter = converter  ?? new InvariantDataTableValueConverter();
 
             string Null = "- NULL -";
 
@@ -297,15 +291,15 @@ public DataTable ToDataTablePivot(int rowColumnIndex, int columnColumnIndex, int
             var valueColumn = this.Columns[valueIndex];
 
             var result = new DataTable();
-            result.Columns.Add(new DataColumn( rowColumn.Column.DisplayName, converter.ConvertType(rowColumn.Column)));
+            result.Columns.Add(new DataColumn( rowColumn.Column.DisplayName, defConverter.ConvertType(rowColumn.Column)));
             foreach (var item in allColumns)
-                result.Columns.Add(new DataColumn(item.ToString(), converter.ConvertType(valueColumn.Column)));
+                result.Columns.Add(new DataColumn(item.ToString(), defConverter.ConvertType(valueColumn.Column)));
 
             foreach (var kvp in dictionary)
             {
                 result.Rows.Add(
-                    allColumns.Select(val => converter.ConvertValue(kvp.Value.TryGetC(val), valueColumn.Column))
-                    .PreAnd(converter.ConvertValue(kvp.Key, rowColumn.Column))
+                    allColumns.Select(val => defConverter.ConvertValue(kvp.Value.TryGetC(val), valueColumn.Column))
+                    .PreAnd(defConverter.ConvertValue(kvp.Key, rowColumn.Column))
                     .ToArray());
             }
 
@@ -339,7 +333,7 @@ public int? EndElementIndex
     public abstract class DataTableValueConverter
     {
         public abstract Type ConvertType(Column column);
-        public abstract object ConvertValue(object value, Column column);
+        public abstract object? ConvertValue(object? value, Column column);
     }
 
     public class NiceDataTableValueConverter : DataTableValueConverter
@@ -360,7 +354,7 @@ public override Type ConvertType(Column column)
             return type.UnNullify();
         }
 
-        public override object ConvertValue(object value, Column column)
+        public override object? ConvertValue(object? value, Column column)
         {
             if (value is Lite<Entity>)
                 return ((Lite<Entity>)value).ToString();
@@ -391,7 +385,7 @@ public override Type ConvertType(Column column)
             return type.UnNullify();
         }
 
-        public override object ConvertValue(object value, Column column)
+        public override object? ConvertValue(object? value, Column column)
         {
             var type = column.Token.Type;
 
@@ -444,7 +438,7 @@ public Lite<Entity> Entity
             get { return (Lite<Entity>)Table.entityColumn.Values[Index]; }
         }
 
-        public Lite<Entity> TryEntity
+        public Lite<Entity>? TryEntity
         {
             get { return Table.entityColumn == null ? null : (Lite<Entity>)Table.entityColumn.Values[Index]; }
         }
diff --git a/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs b/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
index d66bae65e3..73d2a71564 100644
--- a/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities.Reflection;
@@ -92,7 +92,7 @@ public Expression BuildExpression(BuildExpressionContext context)
 
         public abstract PropertyRoute GetPropertyRoute();
 
-        internal PropertyRoute AddPropertyRoute(PropertyInfo pi)
+        internal PropertyRoute? AddPropertyRoute(PropertyInfo pi)
         {
             if (typeof(ModelEntity).IsAssignableFrom(Type))
                 return PropertyRoute.Root(Type).Add(pi);
diff --git a/Signum.Entities/Entity.cs b/Signum.Entities/Entity.cs
index b91277c795..70dcc207c4 100644
--- a/Signum.Entities/Entity.cs
+++ b/Signum.Entities/Entity.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities;
@@ -22,7 +22,7 @@ public abstract class Entity : ModifiableEntity, IEntity
 
 
         [Ignore, DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        protected internal string toStr; //for queries and lites on entities with non-expression ToString
+        protected internal string? toStr; //for queries and lites on entities with non-expression ToString
 
         [HiddenProperty, Description("Id")]
         public PrimaryKey Id
@@ -60,7 +60,7 @@ public long Ticks
             set { ticks = value; }
         }
 
-        protected bool SetIfNew<T>(ref T field, T value, [CallerMemberNameAttribute]string automaticPropertyName = null)
+        protected bool SetIfNew<T>(ref T field, T value, [CallerMemberName]string? automaticPropertyName = null)
         {
             if (EqualityComparer<T>.Default.Equals(field, value))
                 return false;
@@ -70,7 +70,7 @@ protected bool SetIfNew<T>(ref T field, T value, [CallerMemberNameAttribute]stri
                 throw new InvalidOperationException("Attempt to modify '{0}' when the entity is not new".FormatWith(automaticPropertyName));
             }
 
-            return base.Set<T>(ref field, value, automaticPropertyName);
+            return base.Set<T>(ref field, value, automaticPropertyName!);
         }
 
         public override string ToString()
@@ -135,7 +135,7 @@ public M Mixin<M>() where M : MixinEntity
                 .FormatWith(typeof(M).TypeName(), GetType().TypeName()));
         }
 
-        public M TryMixin<M>() where M : MixinEntity
+        public M? TryMixin<M>() where M : MixinEntity
         {
             var current = mixin;
             while (current != null)
@@ -256,7 +256,7 @@ static class ReadonlySetterCache<T> where T : ModifiableEntity
 
             internal static Action<T, V> Setter<V>(PropertyInfo pi)
             {
-                return (Action<T, V>)cache.GetOrAdd(pi.Name, s => ReflectionTools.CreateSetter<T, V>(Reflector.FindFieldInfo(typeof(T), pi)));
+                return (Action<T, V>)cache.GetOrAdd(pi.Name, s => ReflectionTools.CreateSetter<T, V>(Reflector.FindFieldInfo(typeof(T), pi))!);
             }
         }
 
@@ -271,9 +271,9 @@ public static T SetIsNew<T>(this T entity, bool isNew = true)
         public static T SetNotModified<T>(this T mod)
             where T : Modifiable
         {
-            if (mod is Entity e)
-                e.IsNew = false;
-            mod.Modified = ModifiedState.Clean;
+            if (mod is Entity)
+                ((Entity)(Modifiable)mod).IsNew = false;
+            mod.Modified = ModifiedState.Clean; /*Compiler bug*/
             return mod;
         }
 
diff --git a/Signum.Entities/FieldAttributes.cs b/Signum.Entities/FieldAttributes.cs
index e412c3f573..887b436b7a 100644
--- a/Signum.Entities/FieldAttributes.cs
+++ b/Signum.Entities/FieldAttributes.cs
@@ -26,7 +26,7 @@ public sealed class AttachToUniqueIndexesAttribute : Attribute
     [Serializable]
     public struct Implementations : IEquatable<Implementations>, ISerializable
     {
-        object arrayOrType;
+        object? arrayOrType;
 
         public bool IsByAll { get { return arrayOrType == null; } }
         public IEnumerable<Type> Types
@@ -46,11 +46,13 @@ private IEnumerable<Type> Enumerate()
             {
                 yield return t;
             }
-            else
+            else if (arrayOrType is Type[] ts)
             {
-                foreach (var item in ((Type[])arrayOrType))
+                foreach (var item in ts)
                     yield return item;
             }
+            else
+                throw new InvalidOperationException("IsByAll");
         }
 
         public static Implementations? TryFromAttributes(Type t, PropertyRoute route, ImplementedByAttribute ib, ImplementedByAllAttribute iba)
@@ -121,7 +123,7 @@ public static Implementations By(params Type[] types)
             return new Implementations { arrayOrType = types.OrderBy(a => a.FullName).ToArray() };
         }
 
-        static string Error(Type type)
+        static string? Error(Type type)
         {
             if (type.IsInterface)
                 return "{0} is an interface".FormatWith(type.Name);
@@ -183,8 +185,8 @@ public override int GetHashCode()
         public void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             info.AddValue("arrayOrType", arrayOrType == null ? "ALL" :
-                arrayOrType is Type ? ((Type)arrayOrType).AssemblyQualifiedName :
-                arrayOrType is Type[] ? ((Type[])arrayOrType).ToString(a => a.AssemblyQualifiedName, "|") : null);
+                arrayOrType is Type t ? t.AssemblyQualifiedName :
+                arrayOrType is Type[] ts ? ts.ToString(a => a.AssemblyQualifiedName, "|") : null);
         }
     }
 
@@ -279,11 +281,11 @@ public bool HasScale
             get { return scale.HasValue; }
         }
 
-        public string UserDefinedTypeName { get; set; }
+        public string? UserDefinedTypeName { get; set; }
 
-        public string Default { get; set; }
+        public string? Default { get; set; }
 
-        public string Collation { get; set; }
+        public string? Collation { get; set; }
 
         public const string NewId = "NEWID()";
         public const string NewSequentialId = "NEWSEQUENTIALID()";
@@ -371,9 +373,9 @@ public sealed class TicksColumnAttribute : SqlDbTypeAttribute
     {
         public bool HasTicks { get; private set; }
 
-        public string Name { get; set; }
+        public string? Name { get; set; }
 
-        public Type Type { get; set; }
+        public Type? Type { get; set; }
 
         public TicksColumnAttribute(bool hasTicks = true)
         {
@@ -387,7 +389,7 @@ public TicksColumnAttribute(bool hasTicks = true)
     [AttributeUsage(AttributeTargets.Class | AttributeTargets.Field | AttributeTargets.Property /*MList fields*/, Inherited = true, AllowMultiple = false)]
     public sealed class SystemVersionedAttribute : Attribute
     {
-        public string TemporalTableName { get; set; }
+        public string? TemporalTableName { get; set; }
         public string StartDateColumnName { get; set; } = "SysStartDate";
         public string EndDateColumnName { get; set; } = "SysEndDate";
     }
diff --git a/Signum.Entities/ModifiableEntity.cs b/Signum.Entities/ModifiableEntity.cs
index f175fb6556..c4d1a6235c 100644
--- a/Signum.Entities/ModifiableEntity.cs
+++ b/Signum.Entities/ModifiableEntity.cs
@@ -33,18 +33,18 @@ internal static void SetIsRetrievingFunc(Func<bool> isRetrievingFunc)
 
         protected internal const BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
 
-        protected virtual T Get<T>(T fieldValue, [CallerMemberName]string automaticPropertyName = null)
+        protected virtual T Get<T>(T fieldValue, [CallerMemberName]string? automaticPropertyName = null)
         {
             return fieldValue;
         }
 
 
-        protected virtual bool Set<T>(ref T field, T value, [CallerMemberName]string automaticPropertyName = null)
+        protected virtual bool Set<T>(ref T field, T value, [CallerMemberName]string? automaticPropertyName = null)
         {
             if (EqualityComparer<T>.Default.Equals(field, value))
                 return false;
 
-            PropertyInfo pi = GetPropertyInfo(automaticPropertyName);
+            PropertyInfo pi = GetPropertyInfo(automaticPropertyName!);
 
             if (pi == null)
                 throw new ArgumentException("No PropertyInfo with name {0} found in {1} or any implemented interface".FormatWith(automaticPropertyName, this.GetType().TypeName()));
@@ -52,41 +52,39 @@ protected virtual bool Set<T>(ref T field, T value, [CallerMemberName]string aut
             if (value is IMListPrivate && !((IMListPrivate)value).IsNew && !object.ReferenceEquals(value, field))
                 throw new InvalidOperationException("Only MList<T> with IsNew = true can be assigned to an entity");
 
-            if (field is INotifyCollectionChanged col)
+            if (field is INotifyCollectionChanged colb)
             {
                 if (AttributeManager<NotifyCollectionChangedAttribute>.FieldContainsAttribute(GetType(), pi))
-                    col.CollectionChanged -= ChildCollectionChanged;
+                    colb.CollectionChanged -= ChildCollectionChanged;
 
                 if (AttributeManager<NotifyChildPropertyAttribute>.FieldContainsAttribute(GetType(), pi))
-                    foreach (ModifiableEntity item in (IEnumerable)col)
+                    foreach (ModifiableEntity item in (IEnumerable)colb)
                         item.SetParentEntity(null);
             }
 
-            if ((object)field is ModifiableEntity mod)
+            if (field is ModifiableEntity modb)
             {
                 if (AttributeManager<NotifyChildPropertyAttribute>.FieldContainsAttribute(GetType(), pi))
-                    mod.SetParentEntity(null);
+                    modb.SetParentEntity(null);
             }
 
             SetSelfModified();
             field = value;
-
-            col = field as INotifyCollectionChanged;
-            if (col != null)
+            
+            if (field is INotifyCollectionChanged cola)
             {
                 if (AttributeManager<NotifyCollectionChangedAttribute>.FieldContainsAttribute(GetType(), pi))
-                    col.CollectionChanged += ChildCollectionChanged;
+                    cola.CollectionChanged += ChildCollectionChanged;
 
                 if (AttributeManager<NotifyChildPropertyAttribute>.FieldContainsAttribute(GetType(), pi))
-                    foreach (ModifiableEntity item in (IEnumerable)col)
+                    foreach (ModifiableEntity item in (IEnumerable)cola)
                         item.SetParentEntity(this);
             }
-
-            mod = field as ModifiableEntity;
-            if (mod != null)
+            
+            if (field is ModifiableEntity moda)
             {
                 if (AttributeManager<NotifyChildPropertyAttribute>.FieldContainsAttribute(GetType(), pi))
-                    mod.SetParentEntity(this);
+                    moda.SetParentEntity(this);
             }
 
             NotifyPrivate(pi.Name);
@@ -153,7 +151,7 @@ protected virtual void RebindEvents()
                 notify.CollectionChanged += ChildCollectionChanged;
             }
 
-            foreach (object field in AttributeManager<NotifyChildPropertyAttribute>.FieldsWithAttribute(this))
+            foreach (object? field in AttributeManager<NotifyChildPropertyAttribute>.FieldsWithAttribute(this))
             {
                 if (field == null)
                     continue;
@@ -162,7 +160,7 @@ protected virtual void RebindEvents()
                     entity.SetParentEntity(this);
                 else
                 {
-                    foreach (ModifiableEntity item in (IEnumerable)field)
+                    foreach (ModifiableEntity item in (IEnumerable)field!)
                         item.SetParentEntity(this);
                 }
             }
@@ -201,7 +199,7 @@ protected virtual void ChildPropertyChanged(object sender, PropertyChangedEventA
 
         }
 
-        protected virtual string ChildPropertyValidation(ModifiableEntity sender, PropertyInfo pi)
+        protected virtual string? ChildPropertyValidation(ModifiableEntity sender, PropertyInfo pi)
         {
             return null;
         }
@@ -211,14 +209,14 @@ protected virtual string ChildPropertyValidation(ModifiableEntity sender, Proper
         public event PropertyChangedEventHandler PropertyChanged;
 
         [NonSerialized, Ignore]
-        ModifiableEntity parentEntity;
+        ModifiableEntity? parentEntity;
 
-        public ModifiableEntity GetParentEntity()
+        public ModifiableEntity? GetParentEntity()
         {
             return parentEntity;
         }
 
-        private void SetParentEntity(ModifiableEntity p)
+        private void SetParentEntity(ModifiableEntity? p)
         {
             if (p != null && this.parentEntity != null && this.parentEntity != p)
                 throw new InvalidOperationException($"'{nameof(parentEntity)}' is still connected to '{parentEntity}'");
@@ -226,7 +224,7 @@ private void SetParentEntity(ModifiableEntity p)
             this.parentEntity = p;
         }
 
-        internal string OnParentChildPropertyValidation(PropertyInfo pi)
+        internal string? OnParentChildPropertyValidation(PropertyInfo pi)
         {
             if (parentEntity == null)
                 return null;
@@ -277,18 +275,18 @@ public override int GetHashCode()
 
         #region IDataErrorInfo Members
         [HiddenProperty]
-        public string Error
+        public string? Error
         {
             get { return IntegrityCheck()?.Errors.Values.ToString("\r\n"); }
         }
 
-        public IntegrityCheck IntegrityCheck()
+        public IntegrityCheck? IntegrityCheck()
         {
             using (var log = HeavyProfiler.LogNoStackTrace("IntegrityCheck"))
             {
                 var validators = Validator.GetPropertyValidators(GetType());
 
-                Dictionary<string, string> dic = null;
+                Dictionary<string, string>? dic = null;
 
                 foreach (var pv in validators.Values)
                 {
@@ -311,7 +309,7 @@ public IntegrityCheck IntegrityCheck()
 
         //override for per-property checks
         [HiddenProperty]
-        string IDataErrorInfo.this[string columnName]
+        string? IDataErrorInfo.this[string columnName]
         {
             get
             {
@@ -322,12 +320,12 @@ string IDataErrorInfo.this[string columnName]
             }
         }
 
-        public string PropertyCheck(Expression<Func<object>> property)
+        public string? PropertyCheck(Expression<Func<object>> property)
         {
             return PropertyCheck(ReflectionTools.GetPropertyInfo(property).Name);
         }
 
-        public string PropertyCheck(string propertyName)
+        public string? PropertyCheck(string propertyName)
         {
             IPropertyValidator pp = Validator.TryGetPropertyValidator(GetType(), propertyName);
 
@@ -337,7 +335,7 @@ public string PropertyCheck(string propertyName)
             return pp.PropertyCheck(this);
         }
 
-        protected internal virtual string PropertyValidation(PropertyInfo pi)
+        protected internal virtual string? PropertyValidation(PropertyInfo pi)
         {
             return null;
         }
@@ -384,7 +382,7 @@ object ICloneable.Clone()
 
 
         [Ignore]
-        internal Dictionary<string, string> temporalErrors;
+        internal Dictionary<string, string>? temporalErrors;
         internal void SetTemporalErrors(Dictionary<string, string> errors)
         {
             NotifyTemporalErrors();
diff --git a/Signum.Entities/Patterns/ImmutableEntity.cs b/Signum.Entities/Patterns/ImmutableEntity.cs
index d8c49acdd0..8d8829f4ef 100644
--- a/Signum.Entities/Patterns/ImmutableEntity.cs
+++ b/Signum.Entities/Patterns/ImmutableEntity.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Runtime.CompilerServices;
 using Signum.Utilities;
 
@@ -16,12 +16,12 @@ public bool AllowChange
             set { allowTemporaly = value; Notify(() => AllowChange); }
         }
 
-        protected override bool Set<T>(ref T variable, T value, [CallerMemberNameAttribute]string automaticPropertyName = null)
+        protected override bool Set<T>(ref T variable, T value, [CallerMemberName]string? automaticPropertyName = null)
         {
             if (AllowChange)
-                return base.Set(ref variable, value, automaticPropertyName);
+                return base.Set(ref variable, value, automaticPropertyName!);
             else
-                return base.SetIfNew(ref variable, value, automaticPropertyName);
+                return base.SetIfNew(ref variable, value, automaticPropertyName!);
         }
 
         protected internal override void PreSaving(PreSavingContext ctx)
diff --git a/Signum.Entities/Signum.Entities.csproj b/Signum.Entities/Signum.Entities.csproj
index 8ae9ce348e..715a252080 100644
--- a/Signum.Entities/Signum.Entities.csproj
+++ b/Signum.Entities/Signum.Entities.csproj
@@ -2,8 +2,10 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp2.2</TargetFramework>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>8.0</LangVersion>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
+    <NullableReferenceTypes>true</NullableReferenceTypes>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
diff --git a/Signum.Utilities/Extensions/StringExtensions.cs b/Signum.Utilities/Extensions/StringExtensions.cs
index 3a448a1a02..e61cd499ae 100644
--- a/Signum.Utilities/Extensions/StringExtensions.cs
+++ b/Signum.Utilities/Extensions/StringExtensions.cs
@@ -13,7 +13,7 @@ public static class StringExtensions
     {
         static readonly Expression<Func<string, bool>> HasTextExpression = str => (str ?? "").Length > 0;
         [ExpressionField("HasTextExpression")]
-        public static bool HasText(this string str)
+        public static bool HasText(this string? str)
         {
             return !string.IsNullOrEmpty(str);
         }
@@ -603,7 +603,7 @@ public static string FormatWith(this string format, object? arg0)
             return string.Format(format, arg0);
         }
 
-        public static string FormatWith(this string format, object arg0, object arg1)
+        public static string FormatWith(this string format, object? arg0, object arg1)
         {
             return string.Format(format, arg0, arg1);
         }
@@ -780,7 +780,7 @@ public static string Combine(this string separator, params object[] elements)
             return sb == null ? "" : sb.ToString();  // Remove at the end is faster
         }
 
-        public static string CombineIfNotEmpty(this string separator, params object[] elements)
+        public static string CombineIfNotEmpty(this string separator, params object?[] elements)
         {
             StringBuilder? sb = null;
             foreach (var item in elements)

From 91a248b24744456cc7bba7debed0520f38324c3d Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Thu, 10 Jan 2019 07:57:48 +0100
Subject: [PATCH 06/25] not nullable in entities

---
 .../DynamicQuery/ExpressionContainer.cs       |  15 +--
 Signum.Entities/Basics/Operation.cs           |  52 ++++----
 Signum.Entities/DynamicQuery/Column.cs        |   6 +-
 Signum.Entities/DynamicQuery/Meta.cs          |   8 +-
 Signum.Entities/DynamicQuery/QueryUtils.cs    |  23 ++--
 .../DynamicQuery/Tokens/AggregateToken.cs     |  70 +++++-----
 .../DynamicQuery/Tokens/AsTypeToken.cs        |  35 +++--
 .../Tokens/CollectionAnyAllToken.cs           |  33 ++---
 .../Tokens/CollectionElementToken.cs          |  44 ++++---
 .../DynamicQuery/Tokens/ColumnToken.cs        |  41 +++---
 .../DynamicQuery/Tokens/CountToken.cs         |  24 ++--
 .../Tokens/DateTimeSpecialTokens.cs           |  24 ++--
 .../DynamicQuery/Tokens/DateToken.cs          |  23 ++--
 .../Tokens/DecimalSpecialTokens.cs            | 123 ++++++++++--------
 .../Tokens/EntityPropertyToken.cs             |  47 ++++---
 .../Tokens/EntityToStringToken.cs             |  32 ++---
 .../Tokens/ExtensionDictionaryToken.cs        |  43 +++---
 .../DynamicQuery/Tokens/ExtensionToken.cs     |  47 ++++---
 .../DynamicQuery/Tokens/HasValueToken.cs      |  25 ++--
 .../DynamicQuery/Tokens/NetPropertyToken.cs   |  38 +++---
 .../DynamicQuery/Tokens/QueryToken.cs         |  39 +++---
 .../DynamicQuery/Tokens/SystemTimeToken.cs    |  19 +--
 Signum.Entities/Entity.cs                     |   6 +-
 Signum.Entities/EnumEntity.cs                 |   8 +-
 Signum.Entities/Lite.cs                       |  52 ++++----
 Signum.Entities/MList.cs                      |  12 +-
 Signum.Entities/MixinEntity.cs                |  10 +-
 Signum.Entities/ModelEntity.cs                |   6 +-
 Signum.Entities/ModifiableEntity.cs           |   2 +-
 Signum.Entities/ObjectDumper.cs               |  54 ++++----
 Signum.Entities/Patterns/LockeableEntity.cs   |   6 +-
 Signum.Entities/PropertyRoute.cs              | 122 ++++++++---------
 Signum.Entities/Reflection/GraphExplorer.cs   |  16 +--
 Signum.Entities/Reflection/ModifyInspector.cs |  10 +-
 Signum.Entities/Signum.Entities.csproj        |   2 +-
 .../Extensions/DictionaryExtensions.cs        |  24 ++--
 .../Extensions/EnumerableExtensions.cs        |   2 +-
 Signum.Utilities/Extensions/Extensions.cs     |   4 +-
 .../Extensions/StringExtensions.cs            |   8 +-
 39 files changed, 563 insertions(+), 592 deletions(-)

diff --git a/Signum.Engine/DynamicQuery/ExpressionContainer.cs b/Signum.Engine/DynamicQuery/ExpressionContainer.cs
index c789382db5..cf5d378562 100644
--- a/Signum.Engine/DynamicQuery/ExpressionContainer.cs
+++ b/Signum.Engine/DynamicQuery/ExpressionContainer.cs
@@ -225,10 +225,9 @@ public IEnumerable<QueryToken> GetAllTokens(QueryToken parent)
                 unit: info.Unit,
                 format: info.Format,
                 implementations: info.Implementations,
-                propertyRoute: info.PropertyRoute)
-            {
-                Lambda = t => ValueSelector.Evaluate(CollectionSelector.Evaluate(t).SingleOrDefaultEx(kvp => KeySelector.Evaluate(kvp).Equals(key))),
-            });
+                propertyRoute: info.PropertyRoute,
+                lambda: t => ValueSelector.Evaluate(CollectionSelector.Evaluate(t).SingleOrDefaultEx(kvp => KeySelector.Evaluate(kvp).Equals(key)))
+            ));
         }
     }
 
@@ -295,7 +294,7 @@ protected internal virtual ExtensionToken CreateToken(QueryToken parent)
                     result.Format = ColumnDescriptionFactory.GetFormat(cleanMeta.PropertyRoutes);
                     result.Unit = ColumnDescriptionFactory.GetUnit(cleanMeta.PropertyRoutes);
                 }
-                else if(me?.Meta is DirtyMeta dirtyMeta)
+                else if (me?.Meta is DirtyMeta dirtyMeta)
                 {
                     result.PropertyRoute = dirtyMeta.CleanMetas.Select(cm => cm.PropertyRoutes.Only()).Distinct().Only();
                     result.Implementations = dirtyMeta.CleanMetas.Select(cm => cm.Implementations).Distinct().Only();
@@ -323,10 +322,8 @@ protected internal virtual ExtensionToken CreateToken(QueryToken parent)
                 return result;
             });
 
-            return new ExtensionToken(parent, Key, Type, IsProjection, info.Unit, info.Format, info.Implementations, info.IsAllowed(), info.PropertyRoute)
-            {
-                DisplayName = NiceName()
-            };
+            return new ExtensionToken(parent, Key, Type, IsProjection, info.Unit, info.Format,
+                info.Implementations, info.IsAllowed(), info.PropertyRoute, displayName: NiceName());
         }
     }
 
diff --git a/Signum.Entities/Basics/Operation.cs b/Signum.Entities/Basics/Operation.cs
index d32074f1ec..4362253d19 100644
--- a/Signum.Entities/Basics/Operation.cs
+++ b/Signum.Entities/Basics/Operation.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using Signum.Utilities;
 using Signum.Utilities.ExpressionTrees;
 
@@ -19,31 +19,31 @@ public static class Construct<T>
         {
             public static ConstructSymbol<T>.Simple Simple(Type declaringType, string fieldName)
             {
-                return new SimpleImp { Symbol = new OperationSymbol(declaringType, fieldName) };
+                return new SimpleImp(new OperationSymbol(declaringType, fieldName));
             }
 
             public static ConstructSymbol<T>.From<F> From<F>(Type declaringType, string fieldName)
                 where F : class,  IEntity
             {
-                return new FromImp<F> { Symbol = new OperationSymbol(declaringType, fieldName) };
+                return new FromImp<F>(new OperationSymbol(declaringType, fieldName));
             }
 
             public static ConstructSymbol<T>.FromMany<F>  FromMany<F>(Type declaringType, string fieldName)
                 where F : class, IEntity
             {
-                return new FromManyImp<F> { Symbol = new OperationSymbol(declaringType, fieldName) };
+                return new FromManyImp<F>(new OperationSymbol(declaringType, fieldName));
             }
 
             [Serializable]
             class SimpleImp : ConstructSymbol<T>.Simple
             {
-                OperationSymbol symbol;
-                public OperationSymbol Symbol
+                public SimpleImp(OperationSymbol symbol)
                 {
-                    get { return symbol; }
-                    internal set { this.symbol = value; }
+                    this.Symbol = symbol;
                 }
 
+                public OperationSymbol Symbol { get; internal set; }
+
                 public override string ToString()
                 {
                     return "{0}({1})".FormatWith(this.GetType().TypeName(), Symbol);
@@ -54,13 +54,13 @@ public override string ToString()
             class FromImp<F> : ConstructSymbol<T>.From<F>
                 where F : class, IEntity
             {
-                OperationSymbol symbol;
-                public OperationSymbol Symbol
+                public FromImp(OperationSymbol symbol)
                 {
-                    get { return symbol; }
-                    internal set { this.symbol = value; }
+                    Symbol = symbol;
                 }
 
+                public OperationSymbol Symbol { get; private set; }
+
                 public Type BaseType
                 {
                     get { return typeof(F); }
@@ -76,13 +76,13 @@ public override string ToString()
             class FromManyImp<F> : ConstructSymbol<T>.FromMany<F>
                 where F : class, IEntity
             {
-                OperationSymbol symbol;
-                public OperationSymbol Symbol
+                public FromManyImp(OperationSymbol symbol)
                 {
-                    get { return symbol; }
-                    internal set { this.symbol = value; }
+                    Symbol = symbol;
                 }
 
+                public OperationSymbol Symbol { get; set; }
+
                 public Type BaseType
                 {
                     get { return typeof(F); }
@@ -98,26 +98,26 @@ public override string ToString()
         public static ExecuteSymbol<T> Execute<T>(Type declaringType, string fieldName)
             where T : class,  IEntity
         {
-            return new ExecuteSymbolImp<T> { Symbol = new OperationSymbol(declaringType, fieldName) };
+            return new ExecuteSymbolImp<T>(new OperationSymbol(declaringType, fieldName));
         }
 
         public static DeleteSymbol<T> Delete<T>(Type declaringType, string fieldName)
             where T : class, IEntity
         {
-            return new DeleteSymbolImp<T> { Symbol = new OperationSymbol(declaringType, fieldName) };
+            return new DeleteSymbolImp<T>(new OperationSymbol(declaringType, fieldName));
         }
 
         [Serializable]
         class ExecuteSymbolImp<T> : ExecuteSymbol<T>
           where T : class, IEntity
         {
-            OperationSymbol symbol;
-            public OperationSymbol Symbol
+            public ExecuteSymbolImp(OperationSymbol symbol)
             {
-                get { return symbol; }
-                internal set { this.symbol = value; }
+                Symbol = symbol;
             }
 
+            public OperationSymbol Symbol { get; private set; }
+            
             public Type BaseType
             {
                 get { return typeof(T); }
@@ -133,13 +133,13 @@ public override string ToString()
         class DeleteSymbolImp<T> : DeleteSymbol<T>
           where T : class, IEntity
         {
-            OperationSymbol symbol;
-            public OperationSymbol Symbol
+            public DeleteSymbolImp(OperationSymbol symbol)
             {
-                get { return symbol; }
-                internal set { this.symbol = value; }
+                Symbol = symbol;
             }
 
+            public OperationSymbol Symbol { get; private set; }
+
             public Type BaseType
             {
                 get { return typeof(T); }
diff --git a/Signum.Entities/DynamicQuery/Column.cs b/Signum.Entities/DynamicQuery/Column.cs
index 649b209527..efede96a8b 100644
--- a/Signum.Entities/DynamicQuery/Column.cs
+++ b/Signum.Entities/DynamicQuery/Column.cs
@@ -32,8 +32,8 @@ public Column(ColumnDescription cd, object queryName)
         public string Name { get { return Token.FullKey(); } }
         public virtual Type Type { get { return Token.Type; } }
         public Implementations? Implementations { get { return Token.GetImplementations(); } }
-        public string Format { get { return Token.Format; } }
-        public string Unit { get { return Token.Unit; } }
+        public string? Format { get { return Token.Format; } }
+        public string? Unit { get { return Token.Unit; } }
 
         public override string ToString()
         {
@@ -55,7 +55,7 @@ public override int GetHashCode()
     internal class _EntityColumn : Column
     {
         public _EntityColumn(ColumnDescription entityColumn, object queryName)
-            : base(new ColumnToken(entityColumn, queryName), null)
+            : base(new ColumnToken(entityColumn, queryName), null!)
         {
             if (!entityColumn.IsEntity)
                 throw new ArgumentException("entityColumn");
diff --git a/Signum.Entities/DynamicQuery/Meta.cs b/Signum.Entities/DynamicQuery/Meta.cs
index ad2c059460..0aee1f28f0 100644
--- a/Signum.Entities/DynamicQuery/Meta.cs
+++ b/Signum.Entities/DynamicQuery/Meta.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using System.Collections.ObjectModel;
 using Signum.Utilities;
@@ -10,7 +10,7 @@ public abstract class Meta
     {
         public readonly Implementations? Implementations;
 
-        public abstract string IsAllowed();
+        public abstract string? IsAllowed();
 
         protected Meta(Implementations? implementations)
         {
@@ -29,7 +29,7 @@ public CleanMeta(Implementations? implementations, params PropertyRoute[] proper
             this.PropertyRoutes = propertyRoutes;
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
             var result = PropertyRoutes.Select(a => a.IsAllowed()).NotNull();
             if (result.IsEmpty())
@@ -58,7 +58,7 @@ public DirtyMeta(Implementations? implementations, Meta[] properties)
                 .ToReadOnly();
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
             var result = CleanMetas.Select(a => a.IsAllowed()).NotNull();
             if (result.IsEmpty())
diff --git a/Signum.Entities/DynamicQuery/QueryUtils.cs b/Signum.Entities/DynamicQuery/QueryUtils.cs
index cfcfae54a9..735426ccdc 100644
--- a/Signum.Entities/DynamicQuery/QueryUtils.cs
+++ b/Signum.Entities/DynamicQuery/QueryUtils.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities;
@@ -21,13 +21,8 @@ public static string GetKey(object queryName)
 
             return (queryName is Type ? Reflector.CleanTypeName((Type) queryName) : queryName.ToString());
         }
-
+        
         public static string GetNiceName(object queryName)
-        {
-            return GetNiceName(queryName, null);
-        }
-
-        public static string GetNiceName(object queryName, CultureInfo ci)
         {
             if (queryName is Type)
                 queryName = EnumEntity.Extract((Type)queryName) ?? (Type)queryName;
@@ -209,7 +204,7 @@ public static List<FilterOperation> GetFilterOperations(FilterType filtertype)
         };
 
 
-        public static QueryToken SubToken(QueryToken token, QueryDescription qd, SubTokensOptions options, string key)
+        public static QueryToken? SubToken(QueryToken? token, QueryDescription qd, SubTokensOptions options, string key)
         {
             var result = SubTokenBasic(token, qd, options, key);
 
@@ -233,7 +228,7 @@ public static List<QueryToken> SubTokens(this QueryToken token, QueryDescription
         }
 
 
-        private static IEnumerable<QueryToken> AggregateTokens(QueryToken token, QueryDescription qd)
+        private static IEnumerable<QueryToken> AggregateTokens(QueryToken? token, QueryDescription qd)
         {
             if (token == null)
             {
@@ -286,7 +281,7 @@ private static IEnumerable<QueryToken> AggregateTokens(QueryToken token, QueryDe
             }
         }
 
-        static QueryToken SubTokenBasic(QueryToken token, QueryDescription qd, SubTokensOptions options, string key)
+        static QueryToken? SubTokenBasic(QueryToken? token, QueryDescription qd, SubTokensOptions options, string key)
         {
             if (token == null)
             {
@@ -347,7 +342,7 @@ public static QueryToken Parse(string tokenString, QueryDescription qd, SubToken
 
             string firstPart = parts.FirstEx();
 
-            QueryToken result = SubToken(null, qd, options, firstPart);
+            QueryToken? result = SubToken(null, qd, options, firstPart);
 
             if (result == null)
                 throw new FormatException("Column {0} not found on query {1}".FormatWith(firstPart, QueryUtils.GetKey(qd.QueryName)));
@@ -361,7 +356,7 @@ public static QueryToken Parse(string tokenString, QueryDescription qd, SubToken
             return result;
         }
 
-        public static string CanFilter(QueryToken token)
+        public static string? CanFilter(QueryToken token)
         {
             if (token == null)
                 return "No column selected";
@@ -372,7 +367,7 @@ public static string CanFilter(QueryToken token)
             return null;
         }
 
-        public static string CanColumn(QueryToken token)
+        public static string? CanColumn(QueryToken token)
         {
             if (token == null)
                 return "No column selected";
@@ -402,7 +397,7 @@ public static LambdaExpression CreateOrderLambda(QueryToken token, BuildExpressi
             return Expression.Lambda(body, ctx.Parameter);
         }
 
-        public static string CanOrder(QueryToken token)
+        public static string? CanOrder(QueryToken token)
         {
             if (token == null)
                 return "No column selected";
diff --git a/Signum.Entities/DynamicQuery/Tokens/AggregateToken.cs b/Signum.Entities/DynamicQuery/Tokens/AggregateToken.cs
index 966883a0b2..b182de936d 100644
--- a/Signum.Entities/DynamicQuery/Tokens/AggregateToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/AggregateToken.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq.Expressions;
 using Signum.Utilities;
@@ -9,33 +9,33 @@ namespace Signum.Entities.DynamicQuery
     public class AggregateToken : QueryToken
     {
         public AggregateFunction AggregateFunction { get; private set; }
-        public object Value { get; private set; }
+        public object? Value { get; private set; }
         public FilterOperation? FilterOperation { get; private set; }
         public bool Distinct { get; private set; }
 
 
-        object queryName;
+        object? queryName;
         public override object QueryName
         {
             get { return  queryName ?? base.QueryName; }
         }
 
+        QueryToken? parent;
+        public override QueryToken? Parent => parent;
+
         public AggregateToken(AggregateFunction function, object queryName)
-            : base(null)
         {
             if (function != AggregateFunction.Count)
                 throw new ArgumentException("function should be Count for this overload");
 
-            this.queryName = queryName ?? throw new ArgumentNullException(nameof(queryName));
+            this.parent = null;
+            this.queryName = queryName ?? throw new ArgumentNullException("queryName");
             this.AggregateFunction = function;
         }
 
-        public AggregateToken(AggregateFunction function, QueryToken parent, FilterOperation? filterOperation = null, object value = null, bool distinct = false)
-            : base(parent)
+        public AggregateToken(AggregateFunction function, QueryToken parent, FilterOperation? filterOperation = null, object? value = null, bool distinct = false)
         {
-            if (parent == null)
-                throw new ArgumentNullException(nameof(parent));
-
+            this.parent = parent ?? throw new ArgumentNullException("parent");
             this.AggregateFunction = function;
 
             if (function == AggregateFunction.Count)
@@ -60,7 +60,7 @@ public AggregateToken(AggregateFunction function, QueryToken parent, FilterOpera
 
         public override string ToString()
         {
-            string suffix = GetNiceOperation();
+            string? suffix = GetNiceOperation();
 
             return " ".CombineIfNotEmpty(AggregateFunction.NiceToString(), this.GeNiceDistinct(), this.GetNiceOperation(), this.GetNiceValue());
         }
@@ -73,48 +73,48 @@ public override string NiceName()
             return " ".CombineIfNotEmpty(AggregateFunction.NiceToString(), this.GeNiceDistinct(), this.GetNiceOperation(), this.GetNiceValue(), "of", Parent);
         }
 
-        string GetNiceOperation()
+        string? GetNiceOperation()
         {
             return this.FilterOperation == null || this.FilterOperation == DynamicQuery.FilterOperation.EqualTo ? null :
                 this.FilterOperation == DynamicQuery.FilterOperation.DistinctTo ? QueryTokenMessage.Not.NiceToString() :
-                this.FilterOperation.NiceToString();
+                this.FilterOperation.Value.NiceToString();
         }
 
-        string GetNiceValue()
+        string? GetNiceValue()
         {
             return this.FilterOperation == null ? null :
                Value == null ? QueryTokenMessage.Null.NiceToString() :
                Value is Enum e ? e.NiceToString() :
-               Value.ToString();
+               Value!.ToString();
         }
 
-        string GeNiceDistinct()
+        string? GeNiceDistinct()
         {
             return this.Distinct ? QueryTokenMessage.Distinct.NiceToString() : null;
         }
 
-        public override string Format
+        public override string? Format
         {
             get
             {
                 if (AggregateFunction == AggregateFunction.Count)
                     return null;
 
-                if (AggregateFunction == AggregateFunction.Average && Parent.Format == "D")
+                if (AggregateFunction == AggregateFunction.Average && parent!.Format == "D")
                     return "N2";
 
-                return Parent.Format;
+                return this.parent!.Format;
             }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get
             {
                 if (AggregateFunction == AggregateFunction.Count)
                     return null;
 
-                return Parent.Unit;
+                return parent!.Unit;
             }
         }
 
@@ -125,19 +125,21 @@ public override Type Type
                 if (AggregateFunction == AggregateFunction.Count)
                     return typeof(int);
 
-                var pu = Parent.Type.UnNullify();
+                var pt = parent!.Type;
+
+                var ptu = pt.UnNullify();
 
-                if (AggregateFunction == AggregateFunction.Average && (pu != typeof(float) || pu != typeof(double) || pu == typeof(decimal)))
-                    return Parent.Type.IsNullable() ? typeof(double?) : typeof(double);
+                if (AggregateFunction == AggregateFunction.Average && (ptu != typeof(float) || ptu != typeof(double) || ptu == typeof(decimal)))
+                    return pt.IsNullable() ? typeof(double?) : typeof(double);
 
-                if (pu == typeof(bool) ||
-                    pu == typeof(byte) || pu == typeof(sbyte) ||
-                    pu == typeof(short) || pu == typeof(ushort) ||
-                    pu == typeof(uint) ||
-                    pu == typeof(ulong))
-                    return Parent.Type.IsNullable() ? typeof(int?) : typeof(int);
+                if (ptu == typeof(bool) ||
+                    ptu == typeof(byte) || ptu == typeof(sbyte) ||
+                    ptu == typeof(short) || ptu == typeof(ushort) ||
+                    ptu == typeof(uint) ||
+                    ptu == typeof(ulong))
+                    return pt.IsNullable() ? typeof(int?) : typeof(int);
 
-                return Parent.Type;
+                return pt;
             }
         }
 
@@ -172,7 +174,7 @@ protected override Expression BuildExpressionInternal(BuildExpressionContext con
             throw new InvalidOperationException("AggregateToken should have a replacement at this stage");
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
             if (Parent == null)
                 return null;
@@ -185,7 +187,7 @@ public override PropertyRoute GetPropertyRoute()
             return null;
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
             if (Parent == null)
                 return null;
@@ -196,7 +198,7 @@ public override string IsAllowed()
         public override QueryToken Clone()
         {
             if (Parent == null)
-                return new AggregateToken(AggregateFunction, this.queryName);
+                return new AggregateToken(AggregateFunction, this.queryName!);
             else
                 return new AggregateToken(AggregateFunction, Parent.Clone(), this.FilterOperation, this.Value, this.Distinct);
         }
diff --git a/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs b/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs
index d5a4777f9e..62ac1ac70e 100644
--- a/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using Signum.Utilities;
 using System.Linq.Expressions;
@@ -10,17 +10,14 @@ namespace Signum.Entities.DynamicQuery
     [Serializable]
     public class AsTypeToken : QueryToken
     {
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+
         Type entityType;
         internal AsTypeToken(QueryToken parent, Type type)
-            : base(parent)
         {
-            if (parent == null)
-                throw new ArgumentNullException(nameof(parent));
-
-            if (type == null)
-                throw new ArgumentNullException(nameof(type));
-
-            this.entityType = type;
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
+            this.entityType = type ?? throw new ArgumentNullException(nameof(type));
 
             this.Priority = 8;
         }
@@ -43,7 +40,7 @@ public override string Key
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            Expression baseExpression = Parent.BuildExpression(context);
+            Expression baseExpression = parent.BuildExpression(context);
 
             Expression result = Expression.TypeAs(baseExpression.ExtractEntity(false), entityType);
 
@@ -55,12 +52,12 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
             return SubTokensBase(entityType, options, GetImplementations());
         }
 
-        public override string Format
+        public override string? Format
         {
             get { return null; }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return null; }
         }
@@ -70,18 +67,18 @@ public override string Unit
             return Implementations.By(entityType);
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            var parent = Parent.IsAllowed();
-            var routes = GetPropertyRoute().IsAllowed();
+            var parent = parent.IsAllowed();
+            var routes = GetPropertyRoute()!.IsAllowed();
 
             if (parent.HasText() && routes.HasText())
-                QueryTokenMessage.And.NiceToString().Combine(parent, routes);
+                QueryTokenMessage.And.NiceToString().CombineIfNotEmpty(parent, routes);
 
             return parent ?? routes;
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
             return PropertyRoute.Root(entityType);
         }
@@ -89,12 +86,12 @@ public override PropertyRoute GetPropertyRoute()
         public override string NiceName()
         {
             var cleanType = EnumEntity.Extract(entityType) ?? entityType;
-            return QueryTokenMessage._0As1.NiceToString().FormatWith(Parent.ToString(), cleanType.NiceName());
+            return QueryTokenMessage._0As1.NiceToString().FormatWith(parent.ToString(), cleanType.NiceName());
         }
 
         public override QueryToken Clone()
         {
-            return new AsTypeToken(Parent.Clone(), entityType);
+            return new AsTypeToken(parent.Clone(), entityType);
         }
     }
 
diff --git a/Signum.Entities/DynamicQuery/Tokens/CollectionAnyAllToken.cs b/Signum.Entities/DynamicQuery/Tokens/CollectionAnyAllToken.cs
index a67877e6dd..53eff2cfcc 100644
--- a/Signum.Entities/DynamicQuery/Tokens/CollectionAnyAllToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/CollectionAnyAllToken.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -14,20 +14,23 @@ public class CollectionAnyAllToken : QueryToken
     {
         public CollectionAnyAllType CollectionAnyAllType { get; private set; }
 
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+        
         Type elementType;
         internal CollectionAnyAllToken(QueryToken parent, CollectionAnyAllType type)
-            : base(parent)
         {
             elementType = parent.Type.ElementType();
             if (elementType == null)
                 throw new InvalidOperationException("not a collection");
 
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
             this.CollectionAnyAllType = type;
         }
 
         public override Type Type
         {
-            get { return elementType.BuildLiteNullifyUnwrapPrimaryKey(new[] { this.GetPropertyRoute() }); }
+            get { return elementType.BuildLiteNullifyUnwrapPrimaryKey(new[] { this.GetPropertyRoute()! }); }
         }
 
         public override string ToString()
@@ -47,46 +50,44 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
 
         public override Implementations? GetImplementations()
         {
-            return Parent.GetElementImplementations();
+            return parent.GetElementImplementations();
         }
 
-        public override string Format
+        public override string? Format
         {
             get
             {
-
                 if (Parent is ExtensionToken et && et.IsProjection)
                     return et.ElementFormat;
 
-                return Parent.Format;
+                return parent.Format;
             }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get
             {
-
                 if (Parent is ExtensionToken et && et.IsProjection)
                     return et.ElementUnit;
 
-                return Parent.Unit;
+                return parent.Unit;
             }
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return Parent.IsAllowed();
+            return parent.IsAllowed();
         }
 
         public override bool HasAllOrAny() => true;
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
             if (Parent is ExtensionToken et && et.IsProjection)
                 return et.GetElementPropertyRoute();
 
-            PropertyRoute parent = Parent.GetPropertyRoute();
+            PropertyRoute parent = Parent!.GetPropertyRoute()!;
             if (parent != null && parent.Type.ElementType() != null)
                 return parent.Add("Item");
 
@@ -95,12 +96,12 @@ public override PropertyRoute GetPropertyRoute()
 
         public override string NiceName()
         {
-            return null;
+            return null!;
         }
 
         public override QueryToken Clone()
         {
-            return new CollectionAnyAllToken(Parent.Clone(), this.CollectionAnyAllType);
+            return new CollectionAnyAllToken(parent.Clone(), this.CollectionAnyAllType);
         }
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
diff --git a/Signum.Entities/DynamicQuery/Tokens/CollectionElementToken.cs b/Signum.Entities/DynamicQuery/Tokens/CollectionElementToken.cs
index 423420c65d..3056feef7b 100644
--- a/Signum.Entities/DynamicQuery/Tokens/CollectionElementToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/CollectionElementToken.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -14,20 +14,24 @@ public class CollectionElementToken : QueryToken
     {
         public CollectionElementType CollectionElementType { get; private set; }
 
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+
+
         Type elementType;
         internal CollectionElementToken(QueryToken parent, CollectionElementType type)
-            : base(parent)
         {
             elementType = parent.Type.ElementType();
             if (elementType == null)
                 throw new InvalidOperationException("not a collection");
 
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
             this.CollectionElementType = type;
         }
 
         public override Type Type
         {
-            get { return elementType.BuildLiteNullifyUnwrapPrimaryKey(new[] { this.GetPropertyRoute() }); }
+            get { return elementType.BuildLiteNullifyUnwrapPrimaryKey(new[] { this.GetPropertyRoute()! }); }
         }
 
         public override string ToString()
@@ -47,10 +51,10 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
 
         public override Implementations? GetImplementations()
         {
-            return Parent.GetElementImplementations();
+            return parent.GetElementImplementations();
         }
 
-        public override string Format
+        public override string? Format
         {
             get
             {
@@ -58,11 +62,11 @@ public override string Format
                 if (Parent is ExtensionToken et && et.IsProjection)
                     return et.ElementFormat;
 
-                return Parent.Format;
+                return parent.Format;
             }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get
             {
@@ -70,13 +74,13 @@ public override string Unit
                 if (Parent is ExtensionToken et && et.IsProjection)
                     return et.ElementUnit;
 
-                return Parent.Unit;
+                return parent.Unit;
             }
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return Parent.IsAllowed();
+            return parent.IsAllowed();
         }
 
         public override bool HasAllOrAny()
@@ -95,16 +99,16 @@ public override bool HasElement()
                 CollectionElementType == CollectionElementType.Element3;
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
-            if (Parent is ExtensionToken et && et.IsProjection)
+            if (parent is ExtensionToken et && et.IsProjection)
                 return et.GetElementPropertyRoute();
 
-            PropertyRoute parent = Parent.GetPropertyRoute();
-            if (parent != null && parent.Type.ElementType() != null)
-                return parent.Add("Item");
+            PropertyRoute? pr = this.parent.GetPropertyRoute();
+            if (pr != null && pr.Type.ElementType() != null)
+                return pr.Add("Item");
 
-            return parent;
+            return pr;
         }
 
         public override string NiceName()
@@ -114,12 +118,12 @@ public override string NiceName()
             if (parentElement.IsModifiableEntity())
                 return parentElement.NiceName();
 
-            return "Element of " + Parent.NiceName();
+            return "Element of " + Parent?.NiceName();
         }
 
         public override QueryToken Clone()
         {
-            return new CollectionElementToken(Parent.Clone(), CollectionElementType);
+            return new CollectionElementToken(parent.Clone(), CollectionElementType);
         }
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
@@ -148,12 +152,12 @@ public static List<CollectionElementToken> GetElements(HashSet<QueryToken> allTo
                 .ToList();
         }
 
-        public static string MultipliedMessage(List<CollectionElementToken> elements, Type entityType)
+        public static string? MultipliedMessage(List<CollectionElementToken> elements, Type entityType)
         {
             if (elements.IsEmpty())
                 return null;
 
-            return ValidationMessage.TheNumberOf0IsBeingMultipliedBy1.NiceToString().FormatWith(entityType.NiceName(), elements.CommaAnd(a => a.Parent.ToString()));
+            return ValidationMessage.TheNumberOf0IsBeingMultipliedBy1.NiceToString().FormatWith(entityType.NiceName(), elements.CommaAnd(a => a.parent.ToString()));
         }
 
         public override string TypeColor
diff --git a/Signum.Entities/DynamicQuery/Tokens/ColumnToken.cs b/Signum.Entities/DynamicQuery/Tokens/ColumnToken.cs
index 7285c38b3b..e4b214e763 100644
--- a/Signum.Entities/DynamicQuery/Tokens/ColumnToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/ColumnToken.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities;
@@ -19,17 +19,12 @@ public override object QueryName
             get { return queryName; }
         }
 
+        public override QueryToken? Parent => null;
+
         public ColumnToken(ColumnDescription column, object queryName)
-            : base(null)
         {
-            if (column == null)
-                throw new ArgumentNullException(nameof(column));
-
-            if (queryName == null)
-                throw new ArgumentNullException(nameof(queryName));
-
-            this.column = column;
-            this.queryName = queryName;
+            this.column = column ?? throw new ArgumentNullException(nameof(column));
+            this.queryName = queryName ?? throw new ArgumentNullException(nameof(queryName));
         }
 
         public override string Key
@@ -47,12 +42,12 @@ public override Type Type
             get { return Column.Type; }
         }
 
-        public override string Format
+        public override string? Format
         {
             get { return Column.Format; }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return Column.Unit; }
         }
@@ -69,10 +64,11 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
                 if (Column.PropertyRoutes != null)
                 {
                     DateTimePrecision? precision =
-                        Column.PropertyRoutes.Select(pr => 
-                        Validator.TryGetPropertyValidator(pr.Parent.Type, pr.PropertyInfo.Name)?.Validators
-                        .OfType<DateTimePrecisionValidatorAttribute>().SingleOrDefaultEx())
-                        .Select(dtp => dtp?.Precision).Distinct().Only();
+                        Column.PropertyRoutes
+                        .Select(pr => Validator.TryGetPropertyValidator(pr.Parent!.Type, pr.PropertyInfo!.Name)?.Validators.OfType<DateTimePrecisionValidatorAttribute>().SingleOrDefaultEx())
+                        .Select(dtp => dtp?.Precision)
+                        .Distinct()
+                        .Only();
 
                     if (precision != null)
                         return DateTimeProperties(this, precision.Value).AndHasValue(this);
@@ -89,10 +85,11 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
                 if (Column.PropertyRoutes != null)
                 {
                     int? decimalPlaces=
-                        Column.PropertyRoutes.Select(pr => 
-                        Validator.TryGetPropertyValidator(pr.Parent.Type, pr.PropertyInfo.Name)?.Validators
-                        .OfType<DecimalsValidatorAttribute>().SingleOrDefaultEx())
-                        .Select(dtp => dtp?.DecimalPlaces).Distinct().Only();
+                        Column.PropertyRoutes
+                        .Select(pr => Validator.TryGetPropertyValidator(pr.Parent!.Type, pr.PropertyInfo!.Name)?.Validators.OfType<DecimalsValidatorAttribute>().SingleOrDefaultEx())
+                        .Select(dtp => dtp?.DecimalPlaces)
+                        .Distinct()
+                        .Only();
 
                     if (decimalPlaces != null)
                         return StepTokens(this, decimalPlaces.Value).AndHasValue(this);
@@ -110,12 +107,12 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
             return Column.Implementations;
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
             return null;  //If it wasn't, sould be filtered before
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
             if (Column.PropertyRoutes != null)
                 return Column.PropertyRoutes[0]; //HACK: compatibility with IU entitiy elements
diff --git a/Signum.Entities/DynamicQuery/Tokens/CountToken.cs b/Signum.Entities/DynamicQuery/Tokens/CountToken.cs
index adc12b3f29..afb50db12f 100644
--- a/Signum.Entities/DynamicQuery/Tokens/CountToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/CountToken.cs
@@ -12,12 +12,12 @@ namespace Signum.Entities.DynamicQuery
     [Serializable]
     public class CountToken : QueryToken
     {
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+        
         internal CountToken(QueryToken parent)
-            : base(parent)
         {
-            if (parent == null)
-                throw new ArgumentNullException(nameof(parent));
-
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
         }
 
         public override Type Type
@@ -39,7 +39,7 @@ public override string Key
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var parentResult = Parent.BuildExpression(context);
+            var parentResult = parent.BuildExpression(context);
 
             var result = Expression.Call(miCount.MakeGenericMethod(parentResult.Type.ElementType()), parentResult);
 
@@ -51,12 +51,12 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
             return new List<QueryToken>();
         }
 
-        public override string Format
+        public override string? Format
         {
             get { return null; }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return null; }
         }
@@ -66,24 +66,24 @@ public override string Unit
             return null;
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return Parent.IsAllowed();
+            return parent.IsAllowed();
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
             return null;
         }
 
         public override string NiceName()
         {
-            return ToString() + QueryTokenMessage.Of.NiceToString() + Parent.ToString();
+            return ToString() + QueryTokenMessage.Of.NiceToString() + parent.ToString();
         }
 
         public override QueryToken Clone()
         {
-            return new CountToken(Parent.Clone());
+            return new CountToken(parent.Clone());
         }
 
         public override string TypeColor
diff --git a/Signum.Entities/DynamicQuery/Tokens/DateTimeSpecialTokens.cs b/Signum.Entities/DynamicQuery/Tokens/DateTimeSpecialTokens.cs
index 9052b4da7a..ef81c16b5f 100644
--- a/Signum.Entities/DynamicQuery/Tokens/DateTimeSpecialTokens.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/DateTimeSpecialTokens.cs
@@ -12,11 +12,13 @@ namespace Signum.Entities.DynamicQuery
     public class DatePartStartToken : QueryToken
     {
         public QueryTokenMessage Name { get; private set; }
-
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+        
         internal DatePartStartToken(QueryToken parent, QueryTokenMessage name)
-            : base(parent)
         {
             this.Name = name;
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
         }
 
         private static MethodInfo GetMethodInfo(QueryTokenMessage name)
@@ -38,10 +40,10 @@ public override string ToString()
 
         public override string NiceName()
         {
-            return this.Name.NiceToString() + QueryTokenMessage.Of.NiceToString() + Parent.ToString();
+            return this.Name.NiceToString() + QueryTokenMessage.Of.NiceToString() + parent.ToString();
         }
 
-        public override string Format
+        public override string? Format
         {
             get
             {
@@ -56,7 +58,7 @@ public override string Format
             }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return null; }
         }
@@ -85,14 +87,14 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var exp = Parent.BuildExpression(context);
+            var exp = parent.BuildExpression(context);
             var mi = GetMethodInfo(this.Name);
             return Expression.Call(mi, exp.UnNullify()).Nullify();
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
-            return Parent.GetPropertyRoute();
+            return parent.GetPropertyRoute();
         }
 
         public override Implementations? GetImplementations()
@@ -100,14 +102,14 @@ public override PropertyRoute GetPropertyRoute()
             return null;
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return Parent.IsAllowed();
+            return parent.IsAllowed();
         }
 
         public override QueryToken Clone()
         {
-            return new DatePartStartToken(Parent.Clone(), this.Name);
+            return new DatePartStartToken(parent.Clone(), this.Name);
         }
 
         public override bool IsGroupable
diff --git a/Signum.Entities/DynamicQuery/Tokens/DateToken.cs b/Signum.Entities/DynamicQuery/Tokens/DateToken.cs
index af40823faf..f1e3915ce3 100644
--- a/Signum.Entities/DynamicQuery/Tokens/DateToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/DateToken.cs
@@ -11,9 +11,12 @@ namespace Signum.Entities.DynamicQuery
     [Serializable]
     public class DateToken : QueryToken
     {
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+        
         internal DateToken(QueryToken parent)
-            : base(parent)
         {
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
         }
 
         public override string ToString()
@@ -23,15 +26,15 @@ public override string ToString()
 
         public override string NiceName()
         {
-            return QueryTokenMessage.Date.NiceToString() + QueryTokenMessage.Of.NiceToString() + Parent.ToString();
+            return QueryTokenMessage.Date.NiceToString() + QueryTokenMessage.Of.NiceToString() + parent.ToString();
         }
 
-        public override string Format
+        public override string? Format
         {
             get { return "d"; }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return null; }
         }
@@ -55,14 +58,14 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var exp = Parent.BuildExpression(context);
+            var exp = parent.BuildExpression(context);
 
             return Expression.Property(exp.UnNullify(), miDate).Nullify();
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
-            return Parent.GetPropertyRoute();
+            return parent.GetPropertyRoute();
         }
 
         public override Implementations? GetImplementations()
@@ -70,14 +73,14 @@ public override PropertyRoute GetPropertyRoute()
             return null;
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return Parent.IsAllowed();
+            return parent.IsAllowed();
         }
 
         public override QueryToken Clone()
         {
-            return new DateToken(Parent.Clone());
+            return new DateToken(parent.Clone());
         }
 
         public override bool IsGroupable
diff --git a/Signum.Entities/DynamicQuery/Tokens/DecimalSpecialTokens.cs b/Signum.Entities/DynamicQuery/Tokens/DecimalSpecialTokens.cs
index 8a9d00a8f0..931f74c097 100644
--- a/Signum.Entities/DynamicQuery/Tokens/DecimalSpecialTokens.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/DecimalSpecialTokens.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Reflection;
 using System.Linq.Expressions;
@@ -13,9 +13,12 @@ public class StepToken : QueryToken
     {
         public decimal StepSize;
 
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+        
         internal StepToken(QueryToken parent, decimal stepSize)
-            : base(parent)
         {
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
             this.StepSize = stepSize;
             this.Priority = 1;
         }
@@ -27,17 +30,17 @@ public override string ToString()
 
         public override string NiceName()
         {
-            return QueryTokenMessage._0Steps1.NiceToString(Parent.NiceName(), StepSize);
+            return QueryTokenMessage._0Steps1.NiceToString(parent.NiceName(), StepSize);
         }
 
-        public override string Format
+        public override string? Format
         {
-            get { return Parent.Format; }
+            get { return parent.Format; }
         }
 
         public override Type Type
         {
-            get { return Parent.Type.Nullify(); }
+            get { return parent.Type.Nullify(); }
         }
 
         public override string Key
@@ -64,34 +67,34 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var exp = Parent.BuildExpression(context);
+            var exp = parent.BuildExpression(context);
 
             return RoundingExpressionGenerator.RoundExpression(exp, this.StepSize, RoundingType.Ceil);
         }
 
-        public override string Unit
+        public override string? Unit
         {
-            get { return this.Parent.Unit; }
+            get { return this.parent.Unit; }
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
-            return this.Parent.GetPropertyRoute();
+            return this.parent.GetPropertyRoute();
         }
 
         public override Implementations? GetImplementations()
         {
-            return this.Parent.GetImplementations();
+            return this.parent.GetImplementations();
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return this.Parent.IsAllowed();
+            return this.parent.IsAllowed();
         }
 
         public override QueryToken Clone()
         {
-            return new StepToken(this.Parent.Clone(), this.StepSize);
+            return new StepToken(this.parent.Clone(), this.StepSize);
         }
 
         public override bool IsGroupable
@@ -103,9 +106,12 @@ public override bool IsGroupable
     public class StepMultiplierToken : QueryToken
     {
         public decimal Multiplier;
+        internal StepToken parent;
+        public override QueryToken? Parent => parent;
 
-        public StepMultiplierToken(StepToken parent, decimal multiplier) : base(parent)
+        public StepMultiplierToken(StepToken parent, decimal multiplier)
         {
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
             this.Multiplier = multiplier;
         }
 
@@ -117,22 +123,22 @@ public override string ToString()
 
         public override string NiceName()
         {
-            return QueryTokenMessage._0Steps1.NiceToString(Parent.Parent.NiceName(), StepSize());
+            return QueryTokenMessage._0Steps1.NiceToString(parent.NiceName(), StepSize());
         }
 
         internal decimal StepSize()
         {
-            return ((StepToken)this.Parent).StepSize * Multiplier;
+            return parent.StepSize * Multiplier;
         }
 
-        public override string Format
+        public override string? Format
         {
-            get { return Parent.Format; }
+            get { return parent.Format; }
         }
 
         public override Type Type
         {
-            get { return Parent.Type.Nullify(); }
+            get { return parent.Type.Nullify(); }
         }
 
         public override string Key
@@ -142,7 +148,7 @@ public override string Key
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var exp = Parent.Parent.BuildExpression(context);
+            var exp = parent.Parent.BuildExpression(context);
 
             return RoundingExpressionGenerator.RoundExpression(exp, this.StepSize(), RoundingType.Ceil);
         }
@@ -160,27 +166,27 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
 
         public override QueryToken Clone()
         {
-            return new StepMultiplierToken((StepToken)this.Parent.Clone(), this.Multiplier);
+            return new StepMultiplierToken((StepToken)this.parent.Clone(), this.Multiplier);
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return null; }
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
-            return this.Parent.GetPropertyRoute();
+            return this.parent.GetPropertyRoute();
         }
 
         public override Implementations? GetImplementations()
         {
-            return this.Parent.GetImplementations();
+            return this.parent.GetImplementations();
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return this.Parent.IsAllowed();
+            return this.parent.IsAllowed();
         }
 
         public override bool IsGroupable
@@ -192,10 +198,11 @@ public override bool IsGroupable
     public class StepRoundingToken : QueryToken
     {
         public RoundingType Rounding;
-
+        StepMultiplierToken parent;
+        public override QueryToken? Parent => parent;
         public StepRoundingToken(StepMultiplierToken parent, RoundingType rounding)
-            : base(parent)
         {
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
             this.Rounding = rounding;
         }
 
@@ -206,7 +213,7 @@ public override string ToString()
 
         public override string NiceName()
         {
-            var num = ((StepMultiplierToken)this.Parent).StepSize();
+            var num = parent.StepSize();
 
             string str = Rounding == RoundingType.Ceil ? "⌈{0}⌉" :
                 Rounding == RoundingType.Floor ? "⌊{0}⌋" :
@@ -214,17 +221,17 @@ public override string NiceName()
                 Rounding == RoundingType.RoundMiddle ? "|{0}|" :
                 throw new InvalidOperationException();
 
-            return QueryTokenMessage._0Steps1.NiceToString(Parent.Parent.Parent.NiceName(), str.FormatWith(num));
+            return QueryTokenMessage._0Steps1.NiceToString(parent.parent.NiceName(), str.FormatWith(num));
         }
 
-        public override string Format
+        public override string? Format
         {
-            get { return Parent.Format; }
+            get { return parent.Format; }
         }
 
         public override Type Type
         {
-            get { return Parent.Type.Nullify(); }
+            get { return parent.Type.Nullify(); }
         }
 
         public override string Key
@@ -239,34 +246,34 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var exp = Parent.Parent.Parent.BuildExpression(context);
+            var exp = Parent!.Parent!.Parent!.BuildExpression(context);
 
-            return RoundingExpressionGenerator.RoundExpression(exp, ((StepMultiplierToken)this.Parent).StepSize(), this.Rounding);
+            return RoundingExpressionGenerator.RoundExpression(exp, ((StepMultiplierToken)this.Parent!).StepSize(), this.Rounding);
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return null; }
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
-            return this.Parent.GetPropertyRoute();
+            return this.parent.GetPropertyRoute();
         }
 
         public override Implementations? GetImplementations()
         {
-            return this.Parent.GetImplementations();
+            return this.parent.GetImplementations();
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return this.Parent.IsAllowed();
+            return this.parent.IsAllowed();
         }
 
         public override QueryToken Clone()
         {
-            return new StepRoundingToken((StepMultiplierToken)this.Parent.Clone(), this.Rounding);
+            return new StepRoundingToken((StepMultiplierToken)this.parent.Clone(), this.Rounding);
         }
 
         public override bool IsGroupable
@@ -342,9 +349,11 @@ public class ModuloToken : QueryToken
     {
         public int Divisor;
 
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
         internal ModuloToken(QueryToken parent, int divisor)
-            : base(parent)
         {
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
             this.Divisor = divisor;
         }
 
@@ -355,10 +364,10 @@ public override string ToString()
 
         public override string NiceName()
         {
-            return QueryTokenMessage._0Mod1.NiceToString(Parent.NiceName(), Divisor);
+            return QueryTokenMessage._0Mod1.NiceToString(parent.NiceName(), Divisor);
         }
 
-        public override string Format
+        public override string? Format
         {
             get { return null; }
         }
@@ -382,33 +391,33 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var exp = Parent.BuildExpression(context);
+            var exp = parent.BuildExpression(context);
             return Expression.Modulo(Expression.Convert(exp, typeof(int)), Expression.Constant(Divisor)).Nullify();
         }
 
-        public override string Unit
+        public override string? Unit
         {
-            get { return this.Parent.Unit; }
+            get { return this.parent.Unit; }
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
-            return this.Parent.GetPropertyRoute();
+            return this.parent.GetPropertyRoute();
         }
 
         public override Implementations? GetImplementations()
         {
-            return this.Parent.GetImplementations();
+            return this.parent.GetImplementations();
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return this.Parent.IsAllowed();
+            return this.parent.IsAllowed();
         }
 
         public override QueryToken Clone()
         {
-            return new ModuloToken(this.Parent.Clone(), this.Divisor);
+            return new ModuloToken(this.parent.Clone(), this.Divisor);
         }
 
         public override bool IsGroupable
diff --git a/Signum.Entities/DynamicQuery/Tokens/EntityPropertyToken.cs b/Signum.Entities/DynamicQuery/Tokens/EntityPropertyToken.cs
index c279ca69e6..fc2b3dd158 100644
--- a/Signum.Entities/DynamicQuery/Tokens/EntityPropertyToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/EntityPropertyToken.cs
@@ -23,19 +23,19 @@ public static QueryToken IdProperty(QueryToken parent)
             return new EntityPropertyToken(parent, piId, PropertyRoute.Root(parent.Type.CleanType()).Add(piId)) { Priority = 10 };
         }
 
-        internal EntityPropertyToken(QueryToken parent, PropertyInfo pi, PropertyRoute pr)
-            : base(parent)
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+       
+       internal EntityPropertyToken(QueryToken parent, PropertyInfo pi, PropertyRoute pr)
         {
-            if (pi == null)
-                throw new ArgumentNullException(nameof(pi));
-
-            this.PropertyInfo = pi;
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
+            this.PropertyInfo = pi ?? throw new ArgumentNullException(nameof(pi));
             this.PropertyRoute = pr;
         }
 
         public override Type Type
         {
-            get { return PropertyInfo.PropertyType.BuildLiteNullifyUnwrapPrimaryKey(new[] { this.GetPropertyRoute() }); }
+            get { return PropertyInfo.PropertyType.BuildLiteNullifyUnwrapPrimaryKey(new[] { this.GetPropertyRoute()! }); }
         }
 
         public override string ToString()
@@ -50,7 +50,7 @@ public override string Key
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var baseExpression = Parent.BuildExpression(context);
+            var baseExpression = parent.BuildExpression(context);
 
             if (PropertyInfo.Name == nameof(Entity.Id) ||
                 PropertyInfo.Name == nameof(Entity.ToStringProperty))
@@ -78,12 +78,11 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
 
             if (type.UnNullify() == typeof(DateTime))
             {
-                PropertyRoute route = this.GetPropertyRoute();
+                PropertyRoute? route = this.GetPropertyRoute();
 
                 if (route != null)
                 {
-                    var att = Validator.TryGetPropertyValidator(route.Parent.Type, route.PropertyInfo.Name)?.Validators
-                        .OfType<DateTimePrecisionValidatorAttribute>().SingleOrDefaultEx();
+                    var att = Validator.TryGetPropertyValidator(route.Parent!.Type, route.PropertyInfo!.Name)?.Validators.OfType<DateTimePrecisionValidatorAttribute>().SingleOrDefaultEx();
                     if (att != null)
                     {
                         return DateTimeProperties(this, att.Precision).AndHasValue(this);
@@ -95,11 +94,11 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
                 type.UnNullify() == typeof(float) ||
                 type.UnNullify() == typeof(decimal))
             {
-                PropertyRoute route = this.GetPropertyRoute();
+                PropertyRoute? route = this.GetPropertyRoute();
 
                 if (route != null)
                 {
-                    var att = Validator.TryGetPropertyValidator(route.Parent.Type, route.PropertyInfo.Name)?.Validators
+                    var att = Validator.TryGetPropertyValidator(route.Parent!.Type, route.PropertyInfo!.Name)?.Validators
                         .OfType<DecimalsValidatorAttribute>().SingleOrDefaultEx();
                     if (att != null)
                     {
@@ -117,34 +116,32 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
 
         public override Implementations? GetImplementations()
         {
-            return GetPropertyRoute().TryGetImplementations();
+            return GetPropertyRoute()!.TryGetImplementations();
         }
 
-        public override string Format
+        public override string? Format
         {
-            get { return Reflector.FormatString(this.GetPropertyRoute()); }
+            get { return Reflector.FormatString(this.GetPropertyRoute()!); }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return PropertyInfo.GetCustomAttribute<UnitAttribute>()?.UnitName; }
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            PropertyRoute pr = GetPropertyRoute();
-
-            string parent = Parent.IsAllowed();
+            string? parent = this.parent.IsAllowed();
 
-            string route = pr?.IsAllowed();
+            string? route = GetPropertyRoute()?.IsAllowed();
 
             if (parent.HasText() && route.HasText())
-                return QueryTokenMessage.And.NiceToString().Combine(parent, route);
+                return QueryTokenMessage.And.NiceToString().Combine(parent!, route!);
 
             return parent ?? route;
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
             return PropertyRoute;
         }
@@ -156,7 +153,7 @@ public override string NiceName()
 
         public override QueryToken Clone()
         {
-            return new EntityPropertyToken(Parent.Clone(), PropertyInfo, PropertyRoute);
+            return new EntityPropertyToken(parent.Clone(), PropertyInfo, PropertyRoute);
         }
     }
 }
diff --git a/Signum.Entities/DynamicQuery/Tokens/EntityToStringToken.cs b/Signum.Entities/DynamicQuery/Tokens/EntityToStringToken.cs
index 2e4f8714d7..b61ec97a34 100644
--- a/Signum.Entities/DynamicQuery/Tokens/EntityToStringToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/EntityToStringToken.cs
@@ -10,11 +10,13 @@ namespace Signum.Entities.DynamicQuery
     [Serializable]
     public class EntityToStringToken : QueryToken
     {
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+
         internal EntityToStringToken(QueryToken parent)
-            : base(parent)
         {
             Priority = 9;
-
+            this.parent = parent;
         }
 
         public override Type Type
@@ -37,7 +39,7 @@ public override string Key
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var baseExpression = Parent.BuildExpression(context);
+            var baseExpression = parent.BuildExpression(context);
 
             return Expression.Call(baseExpression, miToString);
         }
@@ -52,35 +54,33 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
             return null;
         }
 
-        public override string Format
+        public override string? Format
         {
             get { return null; }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return null; }
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            PropertyRoute route = GetPropertyRoute();
-
-            return Parent.IsAllowed();
+            return parent.IsAllowed();
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
-            PropertyRoute parent = Parent.GetPropertyRoute();
-            if (parent == null)
+            PropertyRoute? pr = parent.GetPropertyRoute();
+            if (pr == null)
             {
-                Type type = Lite.Extract(Parent.Type); //Because Parent.Type is always a lite
+                Type? type = Lite.Extract(pr.Type); //Because Parent.Type is always a lite
                 if (type != null)
                     return PropertyRoute.Root(type).Add(miToStringProperty);
             }
             else
             {
-                Type type = Lite.Extract(parent.Type); //Because Add doesn't work with lites
+                Type? type = Lite.Extract(pr.Type); //Because Add doesn't work with lites
                 if (type != null)
                     return PropertyRoute.Root(type).Add(miToStringProperty);
             }
@@ -90,12 +90,12 @@ public override PropertyRoute GetPropertyRoute()
 
         public override string NiceName()
         {
-            return LiteMessage.ToStr.NiceToString() + QueryTokenMessage.Of.NiceToString() + Parent.ToString();
+            return LiteMessage.ToStr.NiceToString() + QueryTokenMessage.Of.NiceToString() + parent.ToString();
         }
 
         public override QueryToken Clone()
         {
-            return new EntityToStringToken(Parent.Clone());
+            return new EntityToStringToken(parent.Clone());
         }
     }
 }
diff --git a/Signum.Entities/DynamicQuery/Tokens/ExtensionDictionaryToken.cs b/Signum.Entities/DynamicQuery/Tokens/ExtensionDictionaryToken.cs
index 115b0f0640..ac0dc0d7a0 100644
--- a/Signum.Entities/DynamicQuery/Tokens/ExtensionDictionaryToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/ExtensionDictionaryToken.cs
@@ -8,12 +8,16 @@ namespace Signum.Entities.DynamicQuery
 {
     [Serializable]
     public class ExtensionDictionaryToken<T, K, V> : QueryToken
+        where K : Object
     {
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+
         public ExtensionDictionaryToken(QueryToken parent, K key,
             string unit, string format,
             Implementations? implementations,
-            PropertyRoute propertyRoute)
-            : base(parent)
+            PropertyRoute propertyRoute, 
+            Expression<Func<T, V>> lambda)
         {
             this.keyValue= key;
             this.unit = unit;
@@ -21,10 +25,10 @@ public ExtensionDictionaryToken(QueryToken parent, K key,
             this.implementations = implementations;
             this.propertyRoute = propertyRoute;
             this.Priority = -10;
+            this.Lambda = lambda;
+            this.parent = parent;
         }
-
-        public string DisplayName { get; set; }
-
+        
         public override string ToString()
         {
             return "[" + (((object)keyValue) is Enum e ? e.NiceToString() : keyValue.ToString()) + "]";
@@ -35,16 +39,16 @@ public override string NiceName()
             return ((object)keyValue) is Enum e ? e.NiceToString() : keyValue.ToString();
         }
 
-        public override Type Type { get { return typeof(V).BuildLiteNullifyUnwrapPrimaryKey(new[] { this.GetPropertyRoute() }); } }
+        public override Type Type { get { return typeof(V).BuildLiteNullifyUnwrapPrimaryKey(new[] { this.GetPropertyRoute()! }); } }
 
         K keyValue;
         public override string Key => "[" + keyValue.ToString() + "]";
 
         string format;
-        public override string Format => format;
+        public override string? Format => format;
 
         string unit;
-        public override string Unit => unit;
+        public override string? Unit => unit;
 
         protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
         {
@@ -55,7 +59,7 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var parentExpression = Parent.BuildExpression(context).ExtractEntity(false).UnNullify();
+            var parentExpression = parent.BuildExpression(context).ExtractEntity(false).UnNullify();
 
             var result = Expression.Invoke(Lambda, parentExpression);
 
@@ -63,31 +67,26 @@ protected override Expression BuildExpressionInternal(BuildExpressionContext con
         }
 
         public PropertyRoute propertyRoute;
-        public override PropertyRoute GetPropertyRoute() => this.propertyRoute;
+        public override PropertyRoute? GetPropertyRoute() => this.propertyRoute;
 
         public Implementations? implementations;
         public override Implementations? GetImplementations() => this.implementations;
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            PropertyRoute pr = GetPropertyRoute();
-
-            string parent = Parent.IsAllowed();
+            string? parentAllowed = this.parent.IsAllowed();
 
-            string route = pr?.IsAllowed();
+            string? routeAlllowed = GetPropertyRoute()?.IsAllowed();
 
-            if (parent.HasText() && route.HasText())
-                return QueryTokenMessage.And.NiceToString().Combine(parent, route);
+            if (parentAllowed.HasText() && routeAlllowed.HasText())
+                return QueryTokenMessage.And.NiceToString().Combine(parentAllowed!, routeAlllowed!);
 
-            return parent ?? route;
+            return parentAllowed ?? routeAlllowed;
         }
 
         public override QueryToken Clone()
         {
-            return new ExtensionDictionaryToken<T, K, V>(this.Parent.Clone(), keyValue, unit, format, implementations, propertyRoute)
-            {
-                Lambda = Lambda
-            };
+            return new ExtensionDictionaryToken<T, K, V>(this.parent.Clone(), keyValue, unit, format, implementations, propertyRoute, Lambda);
         }
     }
 }
diff --git a/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs b/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
index ed0724c622..f0f44998c6 100644
--- a/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq.Expressions;
 using Signum.Utilities;
@@ -9,12 +9,16 @@ namespace Signum.Entities.DynamicQuery
     [Serializable]
     public class ExtensionToken : QueryToken
     {
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+
+
         public ExtensionToken(QueryToken parent, string key, Type type, bool isProjection,
-            string unit, string format,
-            Implementations? implementations,
-            string isAllowed, PropertyRoute propertyRoute)
-            : base(parent)
+            string? unit, string? format, Implementations? implementations,
+            string? isAllowed, PropertyRoute propertyRoute, string displayName)
         {
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
+
             var shouldHaveImplementations = typeof(IEntity).IsAssignableFrom((isProjection ? type.ElementType() : type).CleanType());
 
             if (shouldHaveImplementations && implementations == null)
@@ -29,6 +33,7 @@ public ExtensionToken(QueryToken parent, string key, Type type, bool isProjectio
             this.implementations = implementations;
             this.isAllowed = isAllowed;
             this.propertyRoute = propertyRoute;
+            this.DisplayName = displayName;
         }
 
         public string DisplayName { get; set; }
@@ -44,7 +49,7 @@ public override string NiceName()
         }
 
         Type type;
-        public override Type Type { get { return type.BuildLiteNullifyUnwrapPrimaryKey(new[] { this.GetPropertyRoute() }); } }
+        public override Type Type { get { return type.BuildLiteNullifyUnwrapPrimaryKey(new[] { this.GetPropertyRoute()! }); } }
 
         string key;
         public override string Key { get { return key; } }
@@ -52,13 +57,13 @@ public override string NiceName()
         bool isProjection;
         public bool IsProjection { get { return isProjection; } }
 
-        string format;
-        public override string Format { get { return isProjection ? null : format; } }
-        public string ElementFormat { get { return isProjection? format: null; } }
+        string? format;
+        public override string? Format { get { return isProjection ? null : format; } }
+        public string? ElementFormat { get { return isProjection? format: null; } }
 
-        string unit;
-        public override string Unit { get { return isProjection? null: unit; } }
-        public string ElementUnit { get { return isProjection?  unit: null; } }
+        string? unit;
+        public override string? Unit { get { return isProjection ? null: unit; } }
+        public string? ElementUnit { get { return isProjection ? unit : null; } }
 
         protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
         {
@@ -72,20 +77,20 @@ protected override Expression BuildExpressionInternal(BuildExpressionContext con
             if (BuildExtension == null)
                 throw new InvalidOperationException("ExtensionToken.BuildExtension not set");
 
-            var parentExpression = Parent.BuildExpression(context).ExtractEntity(false).UnNullify();
+            var parentExpression = parent.BuildExpression(context).ExtractEntity(false).UnNullify();
 
-            var result = BuildExtension(Parent.Type.CleanType().UnNullify(), Key, parentExpression);
+            var result = BuildExtension(parent.Type.CleanType().UnNullify(), Key, parentExpression);
 
             return result.BuildLiteNulifyUnwrapPrimaryKey(new[] { this.propertyRoute });
         }
 
         public PropertyRoute propertyRoute;
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
             return isProjection ? null : propertyRoute;
         }
 
-        public PropertyRoute GetElementPropertyRoute()
+        public PropertyRoute? GetElementPropertyRoute()
         {
             return isProjection ? propertyRoute : null;
         }
@@ -101,20 +106,20 @@ public PropertyRoute GetElementPropertyRoute()
             return isProjection ? implementations : null;
         }
 
-        string isAllowed;
-        public override string IsAllowed()
+        string? isAllowed;
+        public override string? IsAllowed()
         {
-            string parent = Parent.IsAllowed();
+            string? parent = parent.IsAllowed();
 
             if (isAllowed.HasText() && parent.HasText())
-                return QueryTokenMessage.And.NiceToString().Combine(isAllowed, parent);
+                return QueryTokenMessage.And.NiceToString().Combine(isAllowed!, parent!);
 
             return isAllowed ?? parent;
         }
 
         public override QueryToken Clone()
         {
-            return new ExtensionToken(this.Parent.Clone(), key, type, isProjection, unit, format, implementations, isAllowed, propertyRoute);
+            return new ExtensionToken(this.parent.Clone(), key, type, isProjection, unit, format, implementations, isAllowed, propertyRoute, DisplayName);
         }
     }
 }
diff --git a/Signum.Entities/DynamicQuery/Tokens/HasValueToken.cs b/Signum.Entities/DynamicQuery/Tokens/HasValueToken.cs
index e3804de0aa..d4b4869691 100644
--- a/Signum.Entities/DynamicQuery/Tokens/HasValueToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/HasValueToken.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using Signum.Utilities;
 using System.Linq.Expressions;
@@ -29,11 +29,12 @@ internal static List<QueryToken> AndModuloTokens(this List<QueryToken> list, Que
     [Serializable]
     public class HasValueToken : QueryToken
     {
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+        
         internal HasValueToken(QueryToken parent)
-            : base(parent)
         {
-            if (parent == null)
-                throw new ArgumentNullException(nameof(parent));
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
 
             this.Priority = -1;
         }
@@ -55,7 +56,7 @@ public override string Key
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            Expression baseExpression = Parent.BuildExpression(context);
+            Expression baseExpression = parent.BuildExpression(context);
 
             var result = Expression.NotEqual(baseExpression, Expression.Constant(null, baseExpression.Type.Nullify()));
 
@@ -70,12 +71,12 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
             return new List<QueryToken>();
         }
 
-        public override string Format
+        public override string? Format
         {
             get { return null; }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return null; }
         }
@@ -85,24 +86,24 @@ public override string Unit
             return null;
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return Parent.IsAllowed();
+            return parent.IsAllowed();
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
             return null; ;
         }
 
         public override string NiceName()
         {
-            return QueryTokenMessage._0HasValue.NiceToString(Parent.ToString());
+            return QueryTokenMessage._0HasValue.NiceToString(parent.ToString());
         }
 
         public override QueryToken Clone()
         {
-            return new HasValueToken(Parent.Clone());
+            return new HasValueToken(parent.Clone());
         }
     }
 
diff --git a/Signum.Entities/DynamicQuery/Tokens/NetPropertyToken.cs b/Signum.Entities/DynamicQuery/Tokens/NetPropertyToken.cs
index c6cf176ad6..fcbb872729 100644
--- a/Signum.Entities/DynamicQuery/Tokens/NetPropertyToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/NetPropertyToken.cs
@@ -14,6 +14,10 @@ public class NetPropertyToken : QueryToken
         public MemberInfo MemberInfo { get; private set; }
         public Func<string> DisplayName { get; private set; }
 
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+
+
         internal NetPropertyToken(QueryToken parent, Expression<Func<object>> pi, Func<string> displayName) :
             this(parent, ReflectionTools.GetPropertyInfo(pi), displayName)
         {
@@ -21,19 +25,11 @@ internal NetPropertyToken(QueryToken parent, Expression<Func<object>> pi, Func<s
         }
 
         internal NetPropertyToken(QueryToken parent, MemberInfo pi, Func<string> displayName)
-            : base(parent)
         {
-            if (parent == null)
-                throw new ArgumentNullException(nameof(parent));
-
-            if (pi == null)
-                throw new ArgumentNullException(nameof(pi));
-
-            if (displayName == null)
-                throw new ArgumentNullException(nameof(displayName));
+            this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
 
-            this.DisplayName = displayName;
-            this.MemberInfo = pi;
+            this.DisplayName = displayName ?? throw new ArgumentNullException(nameof(displayName));
+            this.MemberInfo = pi ?? throw new ArgumentNullException(nameof(pi));
         }
 
         public override Type Type
@@ -43,7 +39,7 @@ public override Type Type
                 return
                     MemberInfo is PropertyInfo pi ? pi.PropertyType.Nullify() :
                     MemberInfo is MethodInfo mi ? mi.ReturnType.Nullify() :
-                    throw new UnexpectedValueException(MemberInfo);
+                    throw new UnexpectedValueException(MemberInfo! /*CSBUG*/);
             }
         }
 
@@ -61,12 +57,12 @@ public override string Key
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var result = Parent.BuildExpression(context);
+            var result = parent.BuildExpression(context);
 
             var prop =
                 MemberInfo is PropertyInfo pi ? (Expression)Expression.Property(result.UnNullify(), pi) :
                 MemberInfo is MethodInfo mi ? (mi.IsStatic ? Expression.Call(null, mi, result.UnNullify()) : Expression.Call(result.UnNullify(), mi)) :
-                throw new UnexpectedValueException(MemberInfo);
+                throw new UnexpectedValueException(MemberInfo! /*CSBUG*/);
 
             return Expression.Call(miInSql.MakeGenericMethod(prop.Type), prop).Nullify();
         }
@@ -76,12 +72,12 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
             return SubTokensBase(this.Type, options, GetImplementations());
         }
 
-        public override string Format
+        public override string? Format
         {
             get { return null; }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return null; }
         }
@@ -91,24 +87,24 @@ public override string Unit
             return null;
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return Parent.IsAllowed();
+            return parent.IsAllowed();
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
             return null;
         }
 
         public override string NiceName()
         {
-            return DisplayName() + QueryTokenMessage.Of.NiceToString() + Parent.ToString();
+            return DisplayName() + QueryTokenMessage.Of.NiceToString() + parent.ToString();
         }
 
         public override QueryToken Clone()
         {
-            return new NetPropertyToken(Parent.Clone(), MemberInfo, DisplayName);
+            return new NetPropertyToken(parent.Clone(), MemberInfo, DisplayName);
         }
     }
 
diff --git a/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs b/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
index 73d2a71564..d56fb20635 100644
--- a/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
@@ -19,8 +19,8 @@ public abstract class QueryToken : IEquatable<QueryToken>
 
         public abstract override string ToString();
         public abstract string NiceName();
-        public abstract string Format { get; }
-        public abstract string Unit { get; }
+        public abstract string? Format { get; }
+        public abstract string? Unit { get; }
         public abstract Type Type { get; }
         public abstract string Key { get; }
 
@@ -45,7 +45,7 @@ public virtual bool IsGroupable
                     case FilterType.DateTime:
                         {
 
-                            PropertyRoute route = this.GetPropertyRoute();
+                            PropertyRoute? route = this.GetPropertyRoute();
 
                             if (route != null && route.PropertyRouteType == PropertyRouteType.FieldOrProperty)
                             {
@@ -70,10 +70,7 @@ public virtual bool IsGroupable
 
         protected abstract List<QueryToken> SubTokensOverride(SubTokensOptions options);
 
-        public virtual object QueryName
-        {
-            get { return this.parent.QueryName; }
-        }
+        public virtual object QueryName => this.Parent!.QueryName;
 
         public Func<object, T> GetAccessor<T>(BuildExpressionContext context)
         {
@@ -90,18 +87,18 @@ public Expression BuildExpression(BuildExpressionContext context)
 
         protected abstract Expression BuildExpressionInternal(BuildExpressionContext context);
 
-        public abstract PropertyRoute GetPropertyRoute();
+        public abstract PropertyRoute? GetPropertyRoute();
 
         internal PropertyRoute? AddPropertyRoute(PropertyInfo pi)
         {
             if (typeof(ModelEntity).IsAssignableFrom(Type))
                 return PropertyRoute.Root(Type).Add(pi);
 
-            Type type = Lite.Extract(Type); //Because Add doesn't work with lites
+            Type? type = Lite.Extract(Type); //Because Add doesn't work with lites
             if (type != null)
                 return PropertyRoute.Root(type).Add(pi);
 
-            PropertyRoute pr = GetPropertyRoute();
+            PropertyRoute? pr = GetPropertyRoute();
             if (pr == null)
                 return null;
 
@@ -109,32 +106,27 @@ public Expression BuildExpression(BuildExpressionContext context)
         }
 
         public abstract Implementations? GetImplementations();
-        public abstract string IsAllowed();
+        public abstract string? IsAllowed();
 
         public abstract QueryToken Clone();
 
-        QueryToken parent;
-        public QueryToken Parent
-        {
-            get { return parent; }
-        }
+        public abstract QueryToken? Parent { get; }
 
-        public QueryToken(QueryToken parent)
+        public QueryToken()
         {
-            this.parent = parent;
         }
 
         static ConcurrentDictionary<(QueryToken, SubTokensOptions), Dictionary<string, QueryToken>> subTokensOverrideCache =
             new ConcurrentDictionary<(QueryToken, SubTokensOptions), Dictionary<string, QueryToken>>();
 
-        public QueryToken SubTokenInternal(string key, SubTokensOptions options)
+        public QueryToken? SubTokenInternal(string key, SubTokensOptions options)
         {
             var result = CachedSubTokensOverride(options).TryGetC(key) ?? OnEntityExtension(this).SingleOrDefaultEx(a => a.Key == key);
 
             if (result == null)
                 return null;
 
-            string allowed = result.IsAllowed();
+            string? allowed = result.IsAllowed();
             if (allowed != null)
                 throw new UnauthorizedAccessException($"Access to token '{this.FullKey()}.{key}' in query '{QueryUtils.GetKey(this.QueryName)}' is not allowed because: {allowed}");
 
@@ -232,7 +224,7 @@ public static List<QueryToken> DateTimeProperties(QueryToken parent, DateTimePre
         {
             string utc = TimeZoneManager.Mode == TimeZoneMode.Utc ? "Utc - " : "";
 
-            return new List<QueryToken>
+            return new List<QueryToken?>
             {
                 new NetPropertyToken(parent, ReflectionTools.GetPropertyInfo((DateTime dt)=>dt.Year), () => utc + QueryTokenMessage.Year.NiceToString()),
                 new NetPropertyToken(parent, ReflectionTools.GetMethodInfo((DateTime dt ) => dt.Quarter()), ()=> utc + QueryTokenMessage.Quarter.NiceToString()),
@@ -257,7 +249,7 @@ public static List<QueryToken> DateTimeProperties(QueryToken parent, DateTimePre
 
         public static List<QueryToken> StepTokens(QueryToken parent, int decimals)
         {
-            return new List<QueryToken>
+            return new List<QueryToken?>
             {
                 decimals >= 4? new StepToken(parent, 0.0001m): null,
                 decimals >= 3? new StepToken(parent, 0.001m) : null,
@@ -303,7 +295,7 @@ IEnumerable<QueryToken> EntityProperties(Type type)
         {
             var result = from p in Reflector.PublicInstancePropertiesInOrder(type)
                          where Reflector.QueryableProperty(type, p)
-                         select (QueryToken)new EntityPropertyToken(this, p, this.AddPropertyRoute(p));
+                         select (QueryToken)new EntityPropertyToken(this, p, this.AddPropertyRoute(p)!);
 
             if (!type.IsEntity())
                 return result;
@@ -427,6 +419,7 @@ public class BuildExpressionContext
     {
         public BuildExpressionContext(Type tupleType, ParameterExpression parameter, Dictionary<QueryToken, Expression> replacemens)
         {
+            this.TupleType = tupleType;
             this.Parameter = parameter;
             this.Replacemens = replacemens;
         }
diff --git a/Signum.Entities/DynamicQuery/Tokens/SystemTimeToken.cs b/Signum.Entities/DynamicQuery/Tokens/SystemTimeToken.cs
index c123db4380..3de3c8050a 100644
--- a/Signum.Entities/DynamicQuery/Tokens/SystemTimeToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/SystemTimeToken.cs
@@ -12,12 +12,15 @@ namespace Signum.Entities.DynamicQuery
     [Serializable]
     public class SystemTimeToken : QueryToken
     {
+        QueryToken parent;
+        public override QueryToken? Parent => parent;
+        
         SystemTimeProperty property;
         internal SystemTimeToken(QueryToken parent, SystemTimeProperty property)
-            : base(parent)
         {
             Priority = 8;
             this.property = property;
+            this.parent = parent;
         }
 
         public override Type Type
@@ -38,7 +41,7 @@ public override string Key
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var result = Parent.BuildExpression(context).ExtractEntity(false);
+            var result = parent.BuildExpression(context).ExtractEntity(false);
 
             var period = Expression.Call(miSystemPeriod, result.UnNullify());
 
@@ -55,22 +58,22 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
             return null;
         }
 
-        public override string Format
+        public override string? Format
         {
             get { return "s"; }
         }
 
-        public override string Unit
+        public override string? Unit
         {
             get { return null; }
         }
 
-        public override string IsAllowed()
+        public override string? IsAllowed()
         {
-            return Parent.IsAllowed();
+            return parent.IsAllowed();
         }
 
-        public override PropertyRoute GetPropertyRoute()
+        public override PropertyRoute? GetPropertyRoute()
         {
             return null;
         }
@@ -82,7 +85,7 @@ public override string NiceName()
 
         public override QueryToken Clone()
         {
-            return new SystemTimeToken(Parent.Clone(), this.property);
+            return new SystemTimeToken(parent.Clone(), this.property);
         }
     }
 }
diff --git a/Signum.Entities/Entity.cs b/Signum.Entities/Entity.cs
index 70dcc207c4..beb74c0d16 100644
--- a/Signum.Entities/Entity.cs
+++ b/Signum.Entities/Entity.cs
@@ -97,7 +97,7 @@ public override bool Equals(object obj)
             return false;
         }
 
-        public virtual Dictionary<Guid, IntegrityCheck> EntityIntegrityCheck()
+        public virtual Dictionary<Guid, IntegrityCheck>? EntityIntegrityCheck()
         {
             using (Mixins.OfType<CorruptMixin>().Any(c => c.Corrupt) ? Corruption.AllowScope() : null)
             {
@@ -105,7 +105,7 @@ public virtual Dictionary<Guid, IntegrityCheck> EntityIntegrityCheck()
             }
         }
 
-        internal virtual Dictionary<Guid, IntegrityCheck> EntityIntegrityCheckBase()
+        internal virtual Dictionary<Guid, IntegrityCheck>? EntityIntegrityCheckBase()
         {
             using (HeavyProfiler.LogNoStackTrace("EntityIntegrityCheckBase", () => GetType().Name))
                 return GraphExplorer.EntityIntegrityCheck(GraphExplorer.FromRootEntity(this));
@@ -124,7 +124,7 @@ public Entity()
         }
 
         [Ignore, DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        readonly MixinEntity mixin;
+        readonly MixinEntity? mixin;
         public M Mixin<M>() where M : MixinEntity
         {
             var result = TryMixin<M>();
diff --git a/Signum.Entities/EnumEntity.cs b/Signum.Entities/EnumEntity.cs
index 300a9a73c3..10a8b7eb0f 100644
--- a/Signum.Entities/EnumEntity.cs
+++ b/Signum.Entities/EnumEntity.cs
@@ -69,8 +69,6 @@ public static class EnumEntity
     {
         public static Entity FromEnumUntyped(Enum value)
         {
-            if (value == null) return null;
-
             Entity ident = (Entity)Activator.CreateInstance(Generate(value.GetType()));
             ident.Id = new PrimaryKey(EnumExtensions.GetUnderlyingValue(value));
 
@@ -79,9 +77,7 @@ public static Entity FromEnumUntyped(Enum value)
 
         public static Enum ToEnum(Entity ident)
         {
-            if (ident == null) return null;
-
-            Type enumType = Extract(ident.GetType());
+            Type enumType = Extract(ident.GetType())!;
 
             return (Enum)Enum.ToObject(enumType, ident.id);
         }
@@ -111,7 +107,7 @@ public static Type Generate(Type enumType)
             return typeof(EnumEntity<>).MakeGenericType(enumType);
         }
 
-        public static Type Extract(Type enumEntityType)
+        public static Type? Extract(Type enumEntityType)
         {
             if (enumEntityType.IsGenericType && enumEntityType.GetGenericTypeDefinition() == typeof(EnumEntity<>))
                 return enumEntityType.GetGenericArguments()[0];
diff --git a/Signum.Entities/Lite.cs b/Signum.Entities/Lite.cs
index e1e25f4d79..d81f0dc2a4 100644
--- a/Signum.Entities/Lite.cs
+++ b/Signum.Entities/Lite.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using Signum.Utilities;
 using Signum.Entities.Reflection;
 using System.Reflection;
@@ -22,7 +22,7 @@ public interface Lite<out T> : IComparable, IComparable<Lite<Entity>>
         where T : class, IEntity
     {
         T Entity { get; }
-        T EntityOrNull { get; }
+        T? EntityOrNull { get; }
 
         PrimaryKey Id { get; }
         bool IsNew { get;  }
@@ -52,16 +52,16 @@ public abstract class LiteImp : Modifiable
         public sealed class LiteImp<T> : LiteImp, Lite<T>, ISerializable
             where T : Entity
         {
-            T entityOrNull;
+            T? entityOrNull;
             PrimaryKey? id;
-            string toStr;
+            string? toStr;
 
             // Methods
             private LiteImp()
             {
             }
 
-            public LiteImp(PrimaryKey id, string toStr)
+            public LiteImp(PrimaryKey id, string? toStr)
             {
                 if (typeof(T).IsAbstract)
                     throw new InvalidOperationException(typeof(T).Name + " is abstract");
@@ -88,12 +88,12 @@ public LiteImp(T entity, string toStr)
                 this.toStr = toStr;
             }
 
-            public Entity UntypedEntityOrNull
+            public Entity? UntypedEntityOrNull
             {
-                get { return (Entity)(object)entityOrNull; }
+                get { return (Entity?)(object?)entityOrNull; }
             }
 
-            public T EntityOrNull
+            public T? EntityOrNull
             {
                 get { return entityOrNull; }
             }
@@ -157,7 +157,7 @@ public void ClearEntity()
 
             public void RefreshId()
             {
-                id = entityOrNull.Id;
+                id = entityOrNull?.Id;
             }
 
             protected internal override void PreSaving(PreSavingContext ctx)
@@ -168,7 +168,7 @@ protected internal override void PreSaving(PreSavingContext ctx)
                 }
             }
 
-            public override string ToString()
+            public override string? ToString()
             {
                 if (this.entityOrNull != null)
                     return this.entityOrNull.ToString();
@@ -197,8 +197,7 @@ public override bool Equals(object obj)
             const int MagicMask = 123456853;
             public override int GetHashCode()
             {
-                return this.id == null ?
-                    entityOrNull.GetHashCode() ^ MagicMask :
+                return this.id == null ? entityOrNull!.GetHashCode() ^ MagicMask :
                     this.EntityType.FullName.GetHashCode() ^ this.Id.GetHashCode() ^ MagicMask;
             }
 
@@ -214,7 +213,7 @@ public string KeyLong()
 
             public int CompareTo(Lite<Entity> other)
             {
-                return ToString().CompareTo(other.ToString());
+                return ToString()!.CompareTo(other.ToString());
             }
 
             public int CompareTo(object obj)
@@ -276,21 +275,22 @@ public static class Lite
     {
         public static Type BaseImplementationType = typeof(LiteImp);
 
-        static GenericInvoker<Func<PrimaryKey, string, Lite<Entity>>> giNewLite =
-            new GenericInvoker<Func<PrimaryKey, string, Lite<Entity>>>((id, str) => new LiteImp<Entity>(id, str));
+        static GenericInvoker<Func<PrimaryKey, string?, Lite<Entity>>> giNewLite =
+            new GenericInvoker<Func<PrimaryKey, string?, Lite<Entity>>>((id, str) => new LiteImp<Entity>(id, str));
 
-        static GenericInvoker<Func<Entity, string, Lite<Entity>>> giNewLiteFat =
-            new GenericInvoker<Func<Entity, string, Lite<Entity>>>((entity, str) => new LiteImp<Entity>(entity, str));
+        static GenericInvoker<Func<Entity, string?, Lite<Entity>>> giNewLiteFat =
+            new GenericInvoker<Func<Entity, string?, Lite<Entity>>>((entity, str) => new LiteImp<Entity>(entity, str));
 
         public static Type Generate(Type identificableType)
         {
             return typeof(Lite<>).MakeGenericType(identificableType);
         }
 
-        public static Type Extract(Type liteType)
+        public static Type? Extract(Type liteType)
         {
             if (liteType.IsInstantiationOf(typeof(Lite<>)) || typeof(LiteImp).IsAssignableFrom(liteType))
                 return liteType.GetGenericArguments()[0];
+
             return null;
         }
 
@@ -298,9 +298,9 @@ public static Type Extract(Type liteType)
 
         public static Lite<Entity> Parse(string liteKey)
         {
-            string error = TryParseLite(liteKey, out Lite<Entity> result);
+            string? error = TryParseLite(liteKey, out Lite<Entity>? result);
             if (error == null)
-                return result;
+                return result!;
             else
                 throw new FormatException(error);
         }
@@ -310,7 +310,7 @@ public static Lite<T> Parse<T>(string liteKey) where T : class, IEntity
             return (Lite<T>)Lite.Parse(liteKey);
         }
 
-        public static string TryParseLite(string liteKey, out Lite<Entity> result)
+        public static string? TryParseLite(string liteKey, out Lite<Entity>? result)
         {
             result = null;
             if (string.IsNullOrEmpty(liteKey))
@@ -327,16 +327,16 @@ public static string TryParseLite(string liteKey, out Lite<Entity> result)
             if (!PrimaryKey.TryParse(match.Groups["id"].Value, type, out PrimaryKey id))
                 return LiteMessage.IdNotValid.NiceToString();
 
-            string toStr = match.Groups["toStr"].Value.DefaultText(null); //maybe null
+            string? toStr = match.Groups["toStr"].Value.DefaultText(null!); //maybe null
 
             result = giNewLite.GetInvoker(type)(id, toStr);
             return null;
         }
 
-        public static string TryParse<T>(string liteKey, out Lite<T> lite) where T : class, IEntity
+        public static string? TryParse<T>(string liteKey, out Lite<T>? lite) where T : class, IEntity
         {
-            var result = Lite.TryParseLite(liteKey, out Lite<Entity> untypedLite);
-            lite = (Lite<T>)untypedLite;
+            var result = Lite.TryParseLite(liteKey, out Lite<Entity>? untypedLite);
+            lite = (Lite<T>?)untypedLite;
             return result;
         }
 
@@ -568,7 +568,7 @@ public static NewExpression NewExpression(Type type, Expression id, Expression t
         }
 
 
-        static Lite<T> ToLiteFatInternal<T>(this T entity, string toStr)
+        static Lite<T>? ToLiteFatInternal<T>(this T? entity, string? toStr)
             where T : class, IEntity
         {
             if (entity == null)
diff --git a/Signum.Entities/MList.cs b/Signum.Entities/MList.cs
index 48bf795825..a70f8c47ba 100644
--- a/Signum.Entities/MList.cs
+++ b/Signum.Entities/MList.cs
@@ -89,7 +89,7 @@ public override string ToString()
             private RowIdElement(SerializationInfo info, StreamingContext ctxt)
             {
                 this.RowId = null;
-                this.Element = default(T);
+                this.Element = default(T)!;
                 this.OldIndex = null;
                 foreach (SerializationEntry item in info)
                 {
@@ -117,10 +117,10 @@ void ISerializable.GetObjectData(SerializationInfo info, StreamingContext contex
 
 
         [field: NonSerialized]
-        public event PropertyChangedEventHandler PropertyChanged;
+        public event PropertyChangedEventHandler? PropertyChanged;
 
         [NonSerialized]
-        NotifyCollectionChangedEventHandler collectionChanged;
+        NotifyCollectionChangedEventHandler? collectionChanged;
         event NotifyCollectionChangedEventHandler INotifyCollectionChanged.CollectionChanged
         {
             add { collectionChanged += value; }
@@ -611,7 +611,7 @@ void IList.Remove(object value)
             this.Remove((T)value);
         }
 
-        object IList.this[int index]
+        object? IList.this[int index]
         {
             get { return this[index]; }
             set { this[index] = (T)value; }
@@ -850,13 +850,13 @@ public static MList<T> ToMList<T>(this IEnumerable<T> collection)
     [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, Inherited = false, AllowMultiple = false)]
     public sealed class PreserveOrderAttribute : SqlDbTypeAttribute
     {
-        public string Name { get; set; }
+        public string? Name { get; set; }
 
         public PreserveOrderAttribute()
         {
         }
 
-        public PreserveOrderAttribute(string name)
+        public PreserveOrderAttribute(string? name)
         {
             this.Name = name;
         }
diff --git a/Signum.Entities/MixinEntity.cs b/Signum.Entities/MixinEntity.cs
index a0ebfc178c..ff9a304f89 100644
--- a/Signum.Entities/MixinEntity.cs
+++ b/Signum.Entities/MixinEntity.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Linq;
@@ -48,7 +48,7 @@ public static class MixinDeclarations
 
         public static ConcurrentDictionary<Type, HashSet<Type>> Declarations = new ConcurrentDictionary<Type, HashSet<Type>>();
 
-        public static ConcurrentDictionary<Type, Func<Entity, MixinEntity, MixinEntity>> Constructors = new ConcurrentDictionary<Type, Func<Entity, MixinEntity, MixinEntity>>();
+        public static ConcurrentDictionary<Type, Func<Entity, MixinEntity?, MixinEntity>> Constructors = new ConcurrentDictionary<Type, Func<Entity, MixinEntity?, MixinEntity>>();
 
         public static Action<Type> AssertNotIncluded = t => { throw new NotImplementedException("Call MixinDeclarations.Register in the server, after the Connector is created."); };
 
@@ -102,7 +102,7 @@ static void AddConstructor(Type mixinEntity)
                 if (ci.IsPublic || pi.Length != 2 || pi[0].ParameterType != typeof(Entity) || pi[1].ParameterType != typeof(MixinEntity))
                     throw new InvalidOperationException("{0} does not have a non-public construtor with parameters (Entity mainEntity, MixinEntity next)");
 
-                return (Func<Entity, MixinEntity, MixinEntity>)Expression.Lambda(Expression.New(ci, pMainEntity, pNext), pMainEntity, pNext).Compile();
+                return (Func<Entity, MixinEntity?, MixinEntity>)Expression.Lambda(Expression.New(ci, pMainEntity, pNext), pMainEntity, pNext).Compile();
             });
         }
 
@@ -135,11 +135,11 @@ public static void AssertDeclared(Type mainEntity, Type mixinType)
                 throw new InvalidOperationException("Mixin {0} is not registered for {1}. Consider writing MixinDeclarations.Register<{1}, {0}>() at the beginning of Starter.Start".FormatWith(mixinType.TypeName(), mainEntity.TypeName()));
         }
 
-        internal static MixinEntity CreateMixins(Entity mainEntity)
+        internal static MixinEntity? CreateMixins(Entity mainEntity)
         {
             var types = GetMixinDeclarations(mainEntity.GetType());
 
-            MixinEntity result = null;
+            MixinEntity? result = null;
             foreach (var t in types)
                 result = Constructors[t](mainEntity, result);
 
diff --git a/Signum.Entities/ModelEntity.cs b/Signum.Entities/ModelEntity.cs
index 0235c7a1a7..7edb1207f7 100644
--- a/Signum.Entities/ModelEntity.cs
+++ b/Signum.Entities/ModelEntity.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Reflection;
 using Signum.Utilities;
 
@@ -29,10 +29,10 @@ public static Implementations GetImplementations(PropertyRoute route)
 
             PropertyRoute fieldRoute = route;
             if (fieldRoute.PropertyRouteType == PropertyRouteType.LiteEntity)
-                fieldRoute = fieldRoute.Parent;
+                fieldRoute = fieldRoute.Parent!;
 
             if (fieldRoute.PropertyRouteType == PropertyRouteType.MListItems)
-                fieldRoute = fieldRoute.Parent;
+                fieldRoute = fieldRoute.Parent!;
 
             return Implementations.FromAttributes(
                 route.Type.CleanType(),
diff --git a/Signum.Entities/ModifiableEntity.cs b/Signum.Entities/ModifiableEntity.cs
index c4d1a6235c..0fdf2ab85e 100644
--- a/Signum.Entities/ModifiableEntity.cs
+++ b/Signum.Entities/ModifiableEntity.cs
@@ -383,7 +383,7 @@ object ICloneable.Clone()
 
         [Ignore]
         internal Dictionary<string, string>? temporalErrors;
-        internal void SetTemporalErrors(Dictionary<string, string> errors)
+        internal void SetTemporalErrors(Dictionary<string, string>? errors)
         {
             NotifyTemporalErrors();
 
diff --git a/Signum.Entities/ObjectDumper.cs b/Signum.Entities/ObjectDumper.cs
index 5d47f50e5d..078a89f4cb 100644
--- a/Signum.Entities/ObjectDumper.cs
+++ b/Signum.Entities/ObjectDumper.cs
@@ -69,7 +69,7 @@ public void DumpObject(object o)
                     return;
                 }
 
-                Type t = o.GetType();
+                Type t = o!.GetType(); /*CSBUG*/
 
                 if (IsDelegate(t))
                 {
@@ -79,7 +79,7 @@ public void DumpObject(object o)
 
                 if (IsBasicType(t) || t.IsValueType)
                 {
-                    Sb.Append(DumpValue(o));
+                    Sb.Append(DumpValue(o!));
                     return;
                 }
 
@@ -89,19 +89,16 @@ public void DumpObject(object o)
 
                 if (IgnoreTypes.Contains(t))
                 {
-                    Sb.Append("{ " + o.ToString() + " }");
+                    Sb.Append("{ " + o!.ToString() + " }");
                     return;
                 }
 
-                if (objects.Contains(o))
+                if (objects.Contains(o!))
                 {
-                    if (o is Entity)
+                    if (o is Entity ent)
                     {
-                        var ident = o as Entity;
-                        var ent = o as Entity;
-
                         Sb.Append("({0}{1})".FormatWith(
-                            ident.IsNew ? "IsNew": ident.IdOrNull.ToString(),
+                            ent.IsNew ? "IsNew": ent.IdOrNull.ToString(),
                             ent == null ? null : ", ticks: " + ent.ticks
                             ));
                     }
@@ -110,18 +107,17 @@ public void DumpObject(object o)
                         var id =  ((Lite<Entity>)o).IdOrNull;
                         Sb.Append(id.HasValue ? "({0})".FormatWith(id.Value) : "");
                     }
-                    Sb.Append(" /* [CICLE] {0} */".FormatWith(SafeToString(o)));
+                    Sb.Append(" /* [CICLE] {0} */".FormatWith(SafeToString(o!)));
                     return;
                 }
 
-                objects.Add(o);
+                objects.Add(o!);
 
-                if (o is Entity)
+                if (o is Entity e)
                 {
-                    var ent = (Entity)o;
                     Sb.Append("({0}{1})".FormatWith(
-                        ent.IsNew ? "IsNew" : ent.IdOrNull.ToString(),
-                        ent.ticks == 0 ? null : ", ticks: " + ent.ticks
+                        e.IsNew ? "IsNew" : e.IdOrNull.ToString(),
+                        e.ticks == 0 ? null : ", ticks: " + e.ticks
                         ));
 
                     string toString = SafeToString(o);
@@ -129,9 +125,8 @@ public void DumpObject(object o)
                     Sb.Append(" /* {0} */".FormatWith(toString));
                 }
 
-                if (o is Lite<Entity>)
+                if (o is Lite<Entity> l)
                 {
-                    var l = o as Lite<Entity>;
                     Sb.Append("({0}, \"{1}\")".FormatWith((l.IdOrNull.HasValue ? l.Id.ToString() : "null"), l.ToString()));
                     if (((Lite<Entity>)o).EntityOrNull != null)
                     {
@@ -145,7 +140,7 @@ public void DumpObject(object o)
                     return;
                 }
 
-                if (o is IEnumerable && !Any((o as IEnumerable)))
+                if (o is IEnumerable ie && !Any(ie))
                 {
                     Sb.Append("{}");
                     return;
@@ -161,10 +156,9 @@ public void DumpObject(object o)
                 level += 1;
 
                 if (t.Namespace.HasText() && t.Namespace.StartsWith("System.Reflection"))
-                    Sb.AppendLine("ToString = {0},".FormatWith(SafeToString(o)).Indent(level));
-                else if (o is Exception)
+                    Sb.AppendLine("ToString = {0},".FormatWith(SafeToString(o!)).Indent(level));
+                else if (o is Exception ex)
                 {
-                    var ex = o as Exception;
                     DumpPropertyOrField(typeof(string), "Message", ex.Message);
                     DumpPropertyOrField(typeof(string), "StackTrace", ex.StackTrace);
                     DumpPropertyOrField(typeof(Exception), "InnerException", ex.InnerException);
@@ -174,7 +168,7 @@ public void DumpObject(object o)
                 {
                     if (o is IDictionary)
                     {
-                        foreach (DictionaryEntry item in (o as IDictionary))
+                        foreach (DictionaryEntry item in (o as IDictionary)!)
                         {
                             Sb.Append("{".Indent(level));
                             DumpObject(item.Key);
@@ -185,7 +179,7 @@ public void DumpObject(object o)
                     }
                     else
                     {
-                        foreach (var item in (o as IEnumerable))
+                        foreach (var item in (o as IEnumerable)!)
                         {
                             Sb.Append("".Indent(level));
                             DumpObject(item);
@@ -271,13 +265,13 @@ private bool IsIdOrTicks(FieldInfo field)
 
             private bool Any(IEnumerable ie)
             {
-                if (ie is IList)
-                    return (ie as IList).Count > 0;
+                if (ie is IList l)
+                    return l.Count > 0;
 
-                if (ie is Array)
-                    return (ie as Array).Length > 0;
+                if (ie is Array a)
+                    return a.Length > 0;
 
-                foreach (var item in ie)
+                foreach (var item in ie!)
                 {
                     return true;
                 }
@@ -306,8 +300,8 @@ bool IsBasicType(Type type)
             string DumpValue(object item)
             {
                 string value = item?.ToString() ?? "null";
-                string startDelimiter = null;
-                string endDelimiter = null;
+                string? startDelimiter = null;
+                string? endDelimiter = null;
 
                 if (item != null)
                 {
diff --git a/Signum.Entities/Patterns/LockeableEntity.cs b/Signum.Entities/Patterns/LockeableEntity.cs
index a539aa76c1..f14d833a61 100644
--- a/Signum.Entities/Patterns/LockeableEntity.cs
+++ b/Signum.Entities/Patterns/LockeableEntity.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using Signum.Utilities;
@@ -20,7 +20,7 @@ public bool Locked
             }
         }
 
-        protected bool UnsafeSet<T>(ref T field, T value, [CallerMemberNameAttribute]string automaticPropertyName = null)
+        protected bool UnsafeSet<T>(ref T field, T value, [CallerMemberNameAttribute]string? automaticPropertyName = null)
         {
             return base.Set<T>(ref field, value, automaticPropertyName);
         }
@@ -29,7 +29,7 @@ protected virtual void ItemLockedChanged(bool locked)
         {
         }
 
-        protected override bool Set<T>(ref T field, T value, [CallerMemberNameAttribute]string automaticPropertyName = null)
+        protected override bool Set<T>(ref T field, T value, [CallerMemberNameAttribute]string? automaticPropertyName = null)
         {
             if (EqualityComparer<T>.Default.Equals(field, value))
                 return false;
diff --git a/Signum.Entities/PropertyRoute.cs b/Signum.Entities/PropertyRoute.cs
index 5ac2cda2ce..67aedee18b 100644
--- a/Signum.Entities/PropertyRoute.cs
+++ b/Signum.Entities/PropertyRoute.cs
@@ -17,25 +17,25 @@ namespace Signum.Entities
     [Serializable]
     public class PropertyRoute : IEquatable<PropertyRoute>, ISerializable
     {
-        Type type;
+        Type? type;
         public PropertyRouteType PropertyRouteType { get; private set; }
-        public FieldInfo FieldInfo { get; private set; }
-        public PropertyInfo PropertyInfo { get; private set; }
-        public PropertyRoute Parent { get; private set; }
+        public FieldInfo? FieldInfo { get; private set; }
+        public PropertyInfo? PropertyInfo { get; private set; }
+        public PropertyRoute? Parent { get; private set; }
 
         public MemberInfo[] Members
         {
             get
             {
                 return this.Follow(a => a.Parent).Select(a =>
-                    a.PropertyRouteType == Entities.PropertyRouteType.Mixin ? a.type :
-                    a.FieldInfo ?? (MemberInfo)a.PropertyInfo).Reverse().Skip(1).ToArray();
+                    a.PropertyRouteType == Entities.PropertyRouteType.Mixin ? a.type! :
+                    a.FieldInfo ?? (MemberInfo)a.PropertyInfo!).Reverse().Skip(1).ToArray();
             }
         }
 
         public PropertyInfo[] Properties
         {
-            get { return this.Follow(a => a.Parent).Select(a => a.PropertyInfo).Reverse().Skip(1).ToArray(); }
+            get { return this.Follow(a => a.Parent).Select(a => a.PropertyInfo!).Reverse().Skip(1).ToArray(); }
         }
 
         [ForceEagerEvaluation]
@@ -79,7 +79,7 @@ MemberInfo GetMember(string fieldOrProperty)
 
             if (mi == null && Type.IsEntity())
             {
-                string name = ExtractMixin(fieldOrProperty);
+                string? name = ExtractMixin(fieldOrProperty);
 
                 mi = MixinDeclarations.GetMixinDeclarations(Type).FirstOrDefault(t => t.Name == name);
             }
@@ -95,7 +95,7 @@ private bool IsCollection()
             return Type.ElementType() != null && Type != typeof(string);
         }
 
-        static string ExtractMixin(string fieldOrProperty)
+        static string? ExtractMixin(string fieldOrProperty)
         {
             Match match = Regex.Match(fieldOrProperty, @"^\[(?<type>.*)\]$");
 
@@ -160,7 +160,7 @@ void SetParentAndProperty(PropertyRoute parent, MemberInfo fieldOrProperty)
             }
             else if (typeof(Entity).IsAssignableFrom(parent.type) && fieldOrProperty is Type)
             {
-                MixinDeclarations.AssertDeclared(parent.type, (Type)fieldOrProperty);
+                MixinDeclarations.AssertDeclared(parent.type!, (Type)fieldOrProperty);
 
                 type = (Type)fieldOrProperty;
                 PropertyRouteType = PropertyRouteType.Mixin;
@@ -255,7 +255,7 @@ public Type RootType
                 if (type != null && type.IsIRootEntity())
                     return type;
 
-                return Parent.RootType;
+                return Parent!.RootType;
             }
         }
 
@@ -264,15 +264,15 @@ public override string ToString()
             switch (PropertyRouteType)
             {
                 case PropertyRouteType.Root:
-                    return "({0})".FormatWith(typeof(Entity).IsAssignableFrom(type) ? TypeEntity.GetCleanName(type) : type.Name);
+                    return "({0})".FormatWith(typeof(Entity).IsAssignableFrom(type!) ? TypeEntity.GetCleanName(type!) : type!.Name);
                 case PropertyRouteType.FieldOrProperty:
-                    return Parent.ToString() + (Parent.PropertyRouteType == PropertyRouteType.MListItems ? "" : ".") + (PropertyInfo != null ? PropertyInfo.Name : FieldInfo.Name);
+                    return Parent!.ToString() + (Parent!.PropertyRouteType == PropertyRouteType.MListItems ? "" : ".") + (PropertyInfo != null ? PropertyInfo.Name : FieldInfo!.Name);
                 case PropertyRouteType.Mixin:
-                    return Parent.ToString() + "[{0}]".FormatWith(type.Name);
+                    return Parent!.ToString() + "[{0}]".FormatWith(type!.Name);
                 case PropertyRouteType.MListItems:
-                    return Parent.ToString() + "/";
+                    return Parent!.ToString() + "/";
                 case PropertyRouteType.LiteEntity:
-                    return Parent.ToString() + ".Entity";
+                    return Parent!.ToString() + ".Entity";
             }
             throw new InvalidOperationException();
         }
@@ -284,22 +284,22 @@ public string PropertyString()
                 case PropertyRouteType.Root:
                     throw new InvalidOperationException("Root has no PropertyString");
                 case PropertyRouteType.FieldOrProperty:
-                    switch (Parent.PropertyRouteType)
+                    switch (Parent!.PropertyRouteType)
                     {
-                        case PropertyRouteType.Root: return (PropertyInfo != null ? PropertyInfo.Name : FieldInfo.Name);
+                        case PropertyRouteType.Root: return (PropertyInfo != null ? PropertyInfo.Name : FieldInfo!.Name);
                         case PropertyRouteType.FieldOrProperty:
                         case PropertyRouteType.Mixin:
-                            return Parent.PropertyString() + "." + (PropertyInfo != null ? PropertyInfo.Name : FieldInfo.Name);
-                        case PropertyRouteType.MListItems: return Parent.PropertyString() + (PropertyInfo != null ? PropertyInfo.Name : FieldInfo.Name);
+                            return Parent!.PropertyString() + "." + (PropertyInfo != null ? PropertyInfo.Name : FieldInfo!.Name);
+                        case PropertyRouteType.MListItems: return Parent!.PropertyString() + (PropertyInfo != null ? PropertyInfo.Name : FieldInfo!.Name);
                         default: throw new InvalidOperationException();
                     }
 
                 case PropertyRouteType.Mixin:
-                    return "[{0}]".FormatWith(type.Name);
+                    return "[{0}]".FormatWith(type!.Name);
                 case PropertyRouteType.MListItems:
-                    return Parent.PropertyString() + "/";
+                    return Parent!.PropertyString() + "/";
                 case PropertyRouteType.LiteEntity:
-                    return Parent.ToString() + ".Entity";
+                    return Parent!.ToString() + ".Entity";
             }
             throw new InvalidOperationException();
         }
@@ -374,7 +374,7 @@ public static void SetIsAllowedCallback(Func<PropertyRoute, string> isAllowed)
 
         static Func<PropertyRoute, string> IsAllowedCallback;
 
-        public string IsAllowed()
+        public string? IsAllowed()
         {
             if (IsAllowedCallback != null)
                 return IsAllowedCallback(this);
@@ -442,6 +442,12 @@ static List<PropertyRoute> GenerateEmbeddedProperties(PropertyRoute embeddedProp
             return result;
         }
 
+        public override int GetHashCode()
+        {
+            return this.RootType.GetHashCode() ^ (this.PropertyRouteType == Entities.PropertyRouteType.Root ? 0 : this.PropertyString().GetHashCode());
+        }
+
+        public override bool Equals(object obj) => obj is PropertyRoute pr && Equals(pr);
         public bool Equals(PropertyRoute other)
         {
             if (other.PropertyRouteType != this.PropertyRouteType)
@@ -475,28 +481,14 @@ private bool PropertyEquals(PropertyRoute other)
             return other.PropertyInfo != null && ReflectionTools.PropertyEquals(PropertyInfo, other.PropertyInfo);
         }
 
-        public override int GetHashCode()
-        {
-            return this.RootType.GetHashCode() ^ (this.PropertyRouteType == Entities.PropertyRouteType.Root ? 0 : this.PropertyString().GetHashCode());
-        }
-
-        public override bool Equals(object obj)
-        {
-            PropertyRoute other = obj as PropertyRoute;
-
-            if (obj == null)
-                return false;
-
-            return Equals(other);
-        }
-
+        
         public PropertyRoute SimplifyToProperty()
         {
             switch (PropertyRouteType)
             {
                 case PropertyRouteType.FieldOrProperty: return this;
                 case PropertyRouteType.LiteEntity:
-                case PropertyRouteType.MListItems: return this.Parent.SimplifyToProperty();
+                case PropertyRouteType.MListItems: return this.Parent!.SimplifyToProperty();
                 default:
                     throw new InvalidOperationException("PropertyRoute of type {0} not expected".FormatWith(PropertyRouteType));
             }
@@ -510,7 +502,7 @@ public PropertyRoute SimplifyToPropertyOrRoot()
                 case PropertyRouteType.FieldOrProperty: return this;
                 case PropertyRouteType.LiteEntity:
                 case PropertyRouteType.MListItems:
-                case PropertyRouteType.Mixin: return this.Parent.SimplifyToPropertyOrRoot();
+                case PropertyRouteType.Mixin: return this.Parent!.SimplifyToPropertyOrRoot();
                 default:
                     throw new InvalidOperationException("PropertyRoute of type {0} not expected".FormatWith(PropertyRouteType));
             }
@@ -528,7 +520,7 @@ private PropertyRoute(SerializationInfo info, StreamingContext ctxt)
                 this.SetRootType(root);
             else
             {
-                string before = route.TryBeforeLast(".");
+                string? before = route.TryBeforeLast(".");
 
                 if (before != null)
                 {
@@ -549,17 +541,17 @@ public void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             info.AddValue("rootType", RootType.AssemblyQualifiedName);
 
-            string property =
+            string? property =
                 PropertyRouteType == Entities.PropertyRouteType.Root ? null :
-                (PropertyRouteType == Entities.PropertyRouteType.LiteEntity ? this.Parent.PropertyString() + ".Entity" :
+                (PropertyRouteType == Entities.PropertyRouteType.LiteEntity ? this.Parent!.PropertyString() + ".Entity" :
                 this.PropertyString()).Replace("/", ".Item.").TrimEnd('.');
 
             info.AddValue("property", property);
         }
 
-        public PropertyRoute GetMListItemsRoute()
+        public PropertyRoute? GetMListItemsRoute()
         {
-            for (var r = this; r != null; r = r.Parent)
+            for (PropertyRoute? r = this; r != null; r = r.Parent)
             {
                 if (r.PropertyRouteType == PropertyRouteType.MListItems)
                     return r;
@@ -571,14 +563,14 @@ public PropertyRoute GetMListItemsRoute()
         /// <typeparam name="T">The RootType or the type of MListElement</typeparam>
         /// <typeparam name="R">Result type</typeparam>
         /// <returns></returns>
-        public Expression<Func<T, R>> GetLambdaExpression<T, R>(bool safeNullAccess, PropertyRoute skipBefore = null)
+        public Expression<Func<T, R>> GetLambdaExpression<T, R>(bool safeNullAccess, PropertyRoute? skipBefore = null)
         {
             ParameterExpression pe = Expression.Parameter(typeof(T));
-            Expression exp = null;
+            Expression? exp = null;
 
             var steps = this.Follow(a => a.Parent).Reverse();
             if (skipBefore != null)
-                steps = steps.SkipWhile(a => !a.Equals(skipBefore));
+                steps = steps.SkipWhile(a => !a.Equals(skipBefore!));
 
             foreach (var p in steps)
             {
@@ -589,10 +581,10 @@ public Expression<Func<T, R>> GetLambdaExpression<T, R>(bool safeNullAccess, Pro
                         exp = pe.TryConvert(p.Type);
                         break;
                     case PropertyRouteType.FieldOrProperty:
-                        var memberExp = Expression.MakeMemberAccess(exp, (MemberInfo)p.PropertyInfo ?? p.FieldInfo);
-                        if (exp.Type.IsEmbeddedEntity() && safeNullAccess)
+                        var memberExp = Expression.MakeMemberAccess(exp, (MemberInfo?)p.PropertyInfo ?? p.FieldInfo!);
+                        if (exp!.Type.IsEmbeddedEntity() && safeNullAccess)
                             exp = Expression.Condition(
-                                Expression.Equal(exp, Expression.Constant(null, exp.Type)),
+                                Expression.Equal(exp, Expression.Constant(null, exp!.Type)),
                                 Expression.Constant(null, memberExp.Type.Nullify()),
                                 memberExp.Nullify());
                         else
@@ -617,24 +609,12 @@ public Expression<Func<T, R>> GetLambdaExpression<T, R>(bool safeNullAccess, Pro
         public bool IsToStringProperty()
         {
             return PropertyRouteType == PropertyRouteType.FieldOrProperty &&
-                Parent.PropertyRouteType == PropertyRouteType.Root &&
+                Parent!.PropertyRouteType == PropertyRouteType.Root &&
                 PropertyInfo != null && ReflectionTools.PropertyEquals(PropertyInfo, piToStringProperty);
         }
 
         static readonly PropertyInfo piToStringProperty = ReflectionTools.GetPropertyInfo((Entity ident) => ident.ToStringProperty);
-
-        /// <returns>null means impossible to determine because lack of NotifyChildPropertyAttribute</returns>
-        public bool? MatchesProperty(ModifiableEntity entity, PropertyInfo pi)
-        {
-            if (this.PropertyRouteType != PropertyRouteType.FieldOrProperty)
-                return false;
-
-            if (!ReflectionTools.PropertyEquals(PropertyInfo, pi))
-                return false;
-
-            return this.Parent.MatchesEntity(entity);
-        }
-
+        
         public bool? MatchesEntity(ModifiableEntity entity)
         {
             if (this.Type != entity.GetType())
@@ -655,11 +635,11 @@ public bool IsToStringProperty()
                         if (parentEntity == null)
                             return null;
 
-                        var result = this.Parent.MatchesEntity(parentEntity);
+                        var result = this.Parent!.MatchesEntity(parentEntity);
                         if (result != true)
                             return result;
 
-                        return this.PropertyInfo.GetValue(parentEntity) == entity;
+                        return this.PropertyInfo!.GetValue(parentEntity) == entity;
                     }
 
                 case PropertyRouteType.Mixin:
@@ -667,7 +647,7 @@ public bool IsToStringProperty()
                         var mixin = (MixinEntity)entity;
                         var mainEntity = mixin.MainEntity;
 
-                        var result = this.Parent.MatchesEntity(mainEntity);
+                        var result = this.Parent!.MatchesEntity(mainEntity);
                         if (result != true)
                             return result;
 
@@ -680,11 +660,11 @@ public bool IsToStringProperty()
                         if (parentEntity == null)
                             return null;
 
-                        var result = this.Parent.Parent.MatchesEntity(parentEntity);
+                        var result = this.Parent!.Parent!.MatchesEntity(parentEntity);
                         if (result != true)
                             return result;
 
-                        var list = (IList)this.PropertyInfo.GetValue(parentEntity);
+                        var list = (IList)this.PropertyInfo!.GetValue(parentEntity);
 
                         return list != null && list.Contains(entity);
                     }
diff --git a/Signum.Entities/Reflection/GraphExplorer.cs b/Signum.Entities/Reflection/GraphExplorer.cs
index d2d052ab20..bca73c788f 100644
--- a/Signum.Entities/Reflection/GraphExplorer.cs
+++ b/Signum.Entities/Reflection/GraphExplorer.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Collections;
 using Signum.Utilities;
@@ -78,9 +78,9 @@ public static DirectedGraph<Modifiable> FromRootsEntity<T>(IEnumerable<T> roots)
             return DirectedGraph<Modifiable>.Generate(roots.Cast<Modifiable>(), ModifyInspector.EntityExplore, ReferenceEqualityComparer<Modifiable>.Default);
         }
 
-        public static Dictionary<K, V> ToDictionaryOrNull<T, K, V>(this IEnumerable<T> collection, Func<T, K> keySelector, Func<T, V> nullableValueSelector) where V : class
+        public static Dictionary<K, V>? ToDictionaryOrNull<T, K, V>(this IEnumerable<T> collection, Func<T, K> keySelector, Func<T, V?> nullableValueSelector) where V : class
         {
-            Dictionary<K, V> result = null;
+            Dictionary<K, V>? result = null;
 
             foreach (var item in collection)
             {
@@ -98,13 +98,13 @@ public static Dictionary<K, V> ToDictionaryOrNull<T, K, V>(this IEnumerable<T> c
             return result;
         }
 
-        public static Dictionary<Guid, IntegrityCheck> EntityIntegrityCheck(DirectedGraph<Modifiable> graph)
+        public static Dictionary<Guid, IntegrityCheck>? EntityIntegrityCheck(DirectedGraph<Modifiable> graph)
         {
             return graph.OfType<ModifiableEntity>()
                 .ToDictionaryOrNull(a => a.temporalId, a => a.IntegrityCheck());
         }
 
-        public static Dictionary<Guid, IntegrityCheck> FullIntegrityCheck(DirectedGraph<Modifiable> graph)
+        public static Dictionary<Guid, IntegrityCheck>? FullIntegrityCheck(DirectedGraph<Modifiable> graph)
         {
             AssertCloneAttack(graph);
 
@@ -129,7 +129,7 @@ public static List<IntegrityCheckWithEntity> WithEntities(this Dictionary<Guid,
         static void AssertCloneAttack(DirectedGraph<Modifiable> graph)
         {
             var problems = (from m in graph.OfType<Entity>()
-                            group m by new { Type = m.GetType(), Id = (m as Entity)?.Let(ident => (object)ident.IdOrNull) ?? (object)m.temporalId } into g
+                            group m by new { Type = m.GetType(), Id = (m as Entity)?.Let(ident => (object?)ident.IdOrNull) ?? (object)m.temporalId } into g
                             where g.Count() > 1 && g.Count(m => m.Modified == ModifiedState.SelfModified) > 0
                             select g).ToList();
 
@@ -157,7 +157,7 @@ public static DirectedGraph<Modifiable> PreSaving(Func<DirectedGraph<Modifiable>
                 if (m is ModifiableEntity me)
                     me.SetTemporalErrors(null);
 
-                m.PreSaving(ctx);
+                m!.PreSaving(ctx); /*CSBUG*/
             });
         }
 
@@ -231,7 +231,7 @@ public static string SuperGraphviz(this DirectedGraph<Modifiable> modifiables)
 
             }).ToList();
 
-            string nodes = listNodes.ToString(t => "    {0} [color={1}, fillcolor={2} shape={3}{4}, label=\"{5}\"]".FormatWith(modifiables.Comparer.GetHashCode(t.Node), t.Color, t.Fillcolor, t.Shape, t.Style, t.Label), "\r\n");
+            string nodes = listNodes.ToString(t => "    {0} [color={1}, fillcolor={2} shape={3}{4}, label=\"{5}\"]".FormatWith(modifiables.Comparer.GetHashCode(t.Node! /*CSBUG*/), t.Color, t.Fillcolor, t.Shape, t.Style, t.Label), "\r\n");
 
             string arrows = modifiables.Edges.ToString(e => "    {0} -> {1}".FormatWith(modifiables.Comparer.GetHashCode(e.From), modifiables.Comparer.GetHashCode(e.To)), "\r\n");
 
diff --git a/Signum.Entities/Reflection/ModifyInspector.cs b/Signum.Entities/Reflection/ModifyInspector.cs
index 1d2071933b..301009fe5e 100644
--- a/Signum.Entities/Reflection/ModifyInspector.cs
+++ b/Signum.Entities/Reflection/ModifyInspector.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Reflection;
 using System.Collections;
@@ -58,7 +58,7 @@ public static IEnumerable<Modifiable> FullExplore(Modifiable obj)
                 Type t = obj.GetType().ElementType();
                 if (Reflector.IsModifiableIdentifiableOrLite(t))
                 {
-                    IEnumerable col = obj as IEnumerable;
+                    IEnumerable col = (IEnumerable)obj;
                     foreach (Modifiable item in col)
                         if (item != null)
                             yield return item;
@@ -96,8 +96,8 @@ public static IEnumerable<Modifiable> FullExploreVirtual(Modifiable obj)
                 Type t = obj.GetType().ElementType();
                 if (Reflector.IsModifiableIdentifiableOrLite(t))
                 {
-                    IEnumerable col = obj as IEnumerable;
-                    foreach (Modifiable item in col)
+                    IEnumerable col = (IEnumerable)obj;
+                    foreach (Modifiable item in col!)
                         if (item != null)
                             yield return item;
                 }
@@ -135,7 +135,7 @@ public static IEnumerable<Modifiable> EntityExplore(Modifiable obj)
 
                 if (t.IsModifiable() && !t.IsEntity())
                 {
-                    IEnumerable col = obj as IEnumerable;
+                    IEnumerable col = (IEnumerable)obj;
                     foreach (Modifiable item in col)
                         if (item != null)
                             yield return item;
diff --git a/Signum.Entities/Signum.Entities.csproj b/Signum.Entities/Signum.Entities.csproj
index 715a252080..429301ed45 100644
--- a/Signum.Entities/Signum.Entities.csproj
+++ b/Signum.Entities/Signum.Entities.csproj
@@ -5,7 +5,7 @@
     <LangVersion>8.0</LangVersion>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
     <NullableReferenceTypes>true</NullableReferenceTypes>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <!--<TreatWarningsAsErrors>true</TreatWarningsAsErrors>-->
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
diff --git a/Signum.Utilities/Extensions/DictionaryExtensions.cs b/Signum.Utilities/Extensions/DictionaryExtensions.cs
index 2e0759a7cd..4d8976de78 100644
--- a/Signum.Utilities/Extensions/DictionaryExtensions.cs
+++ b/Signum.Utilities/Extensions/DictionaryExtensions.cs
@@ -96,7 +96,7 @@ public static V GetOrThrow<K, V>(this IDictionary<K, V> dictionary, K key, strin
             return result;
         }
 
-        public static V GetOrThrow<K, V>(this IDictionary<K, V> dictionary, K key)
+        public static V GetOrThrow<K, V>(this IDictionary<K, V> dictionary, K key) where K : object
         {
             if (!dictionary.TryGetValue(key, out V result))
                 throw new KeyNotFoundException("Key '{0}' ({1}) not found on {2}".FormatWith(key, key.GetType().TypeName(), dictionary.GetType().TypeName()));
@@ -133,7 +133,7 @@ public static Dictionary<K, V> ToDictionary<K, V>(this IEnumerable<KeyValuePair<
             return result;
         }
 
-        public static Dictionary<K, V> ToDictionaryEx<K, V>(this IEnumerable<KeyValuePair<K, V>> collection, string errorContext = null)
+        public static Dictionary<K, V> ToDictionaryEx<K, V>(this IEnumerable<KeyValuePair<K, V>> collection, string? errorContext = null)
         {
             var result = new Dictionary<K, V>();
             result.AddRange<K, V>(collection, errorContext ?? typeof(K).TypeName());
@@ -147,7 +147,7 @@ public static Dictionary<K, V> ToDictionary<K, V>(this IEnumerable<KeyValuePair<
             return result;
         }
 
-        public static Dictionary<K, V> ToDictionaryEx<K, V>(this IEnumerable<KeyValuePair<K, V>> collection, IEqualityComparer<K> comparer, string errorContext = null)
+        public static Dictionary<K, V> ToDictionaryEx<K, V>(this IEnumerable<KeyValuePair<K, V>> collection, IEqualityComparer<K> comparer, string? errorContext = null)
         {
             var result = new Dictionary<K, V>(comparer);
             result.AddRange<K, V>(collection, errorContext ?? typeof(K).TypeName());
@@ -155,28 +155,28 @@ public static Dictionary<K, V> ToDictionaryEx<K, V>(this IEnumerable<KeyValuePai
         }
 
 
-        public static Dictionary<K, T> ToDictionaryEx<T, K>(this IEnumerable<T> source, Func<T, K> keySelector, string errorContext = null)
+        public static Dictionary<K, T> ToDictionaryEx<T, K>(this IEnumerable<T> source, Func<T, K> keySelector, string? errorContext = null)
         {
             Dictionary<K, T> result = new Dictionary<K, T>();
             result.AddRange(source, keySelector, v => v, errorContext ?? typeof(K).TypeName());
             return result;
         }
 
-        public static Dictionary<K, V> ToDictionaryEx<T, K, V>(this IEnumerable<T> source, Func<T, K> keySelector, Func<T, V> elementSelector, string errorContext = null)
+        public static Dictionary<K, V> ToDictionaryEx<T, K, V>(this IEnumerable<T> source, Func<T, K> keySelector, Func<T, V> elementSelector, string? errorContext = null)
         {
             Dictionary<K, V> result = new Dictionary<K, V>();
             result.AddRange(source, keySelector, elementSelector, errorContext ?? typeof(K).TypeName());
             return result;
         }
 
-        public static Dictionary<K, T> ToDictionaryEx<T, K>(this IEnumerable<T> source, Func<T, K> keySelector, IEqualityComparer<K> comparer, string errorContext = null)
+        public static Dictionary<K, T> ToDictionaryEx<T, K>(this IEnumerable<T> source, Func<T, K> keySelector, IEqualityComparer<K> comparer, string? errorContext = null)
         {
             Dictionary<K, T> result = new Dictionary<K, T>(comparer);
             result.AddRange(source, keySelector, v => v, errorContext ?? typeof(K).TypeName());
             return result;
         }
 
-        public static Dictionary<K, V> ToDictionaryEx<T, K, V>(this IEnumerable<T> source, Func<T, K> keySelector, Func<T, V> elementSelector, IEqualityComparer<K> comparer, string errorContext = null)
+        public static Dictionary<K, V> ToDictionaryEx<T, K, V>(this IEnumerable<T> source, Func<T, K> keySelector, Func<T, V> elementSelector, IEqualityComparer<K> comparer, string? errorContext = null)
         {
             Dictionary<K, V> result = new Dictionary<K, V>(comparer);
             result.AddRange(source, keySelector, elementSelector, errorContext ?? typeof(K).TypeName());
@@ -252,7 +252,7 @@ public static void JoinDictionaryForeachStrict<K, C, S>(
             }
         }
 
-        public static Dictionary<K, R> OuterJoinDictionaryCC<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1, V2, R> mixer)
+        public static Dictionary<K, R> OuterJoinDictionaryCC<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2?, R> mixer)
             where V1 : class
             where V2 : class
         {
@@ -263,7 +263,7 @@ public static Dictionary<K, R> OuterJoinDictionaryCC<K, V1, V2, R>(this IReadOnl
             return set.ToDictionaryEx(k => k, k => mixer(k, dic1.TryGetC(k), dic2.TryGetC(k)));
         }
 
-        public static Dictionary<K, R> OuterJoinDictionarySC<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2, R> mixer)
+        public static Dictionary<K, R> OuterJoinDictionarySC<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2?, R> mixer)
             where V1 : struct
             where V2 : class
         {
@@ -274,7 +274,7 @@ public static Dictionary<K, R> OuterJoinDictionarySC<K, V1, V2, R>(this IReadOnl
             return set.ToDictionaryEx(k => k, k => mixer(k, dic1.TryGetS(k), dic2.TryGetC(k)));
         }
 
-        public static Dictionary<K, V3> OuterJoinDictionarySC<K, V1, V2, V3>(this IReadOnlyDictionary<K, V1?> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2, V3> mixer)
+        public static Dictionary<K, V3> OuterJoinDictionarySC<K, V1, V2, V3>(this IReadOnlyDictionary<K, V1?> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2?, V3> mixer)
             where V1 : struct
             where V2 : class
         {
@@ -285,7 +285,7 @@ public static Dictionary<K, V3> OuterJoinDictionarySC<K, V1, V2, V3>(this IReadO
             return set.ToDictionaryEx(k => k, k => mixer(k, dic1.TryGetS(k), dic2.TryGetC(k)));
         }
 
-        public static Dictionary<K, R> OuterJoinDictionaryCS<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1, V2?, R> mixer)
+        public static Dictionary<K, R> OuterJoinDictionaryCS<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2> dic2, Func<K, V1?, V2?, R> mixer)
             where V1 : class
             where V2 : struct
         {
@@ -296,7 +296,7 @@ public static Dictionary<K, R> OuterJoinDictionaryCS<K, V1, V2, R>(this IReadOnl
             return set.ToDictionaryEx(k => k, k => mixer(k, dic1.TryGetC(k), dic2.TryGetS(k)));
         }
 
-        public static Dictionary<K, R> OuterJoinDictionaryCS<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2?> dic2, Func<K, V1, V2?, R> mixer)
+        public static Dictionary<K, R> OuterJoinDictionaryCS<K, V1, V2, R>(this IReadOnlyDictionary<K, V1> dic1, IReadOnlyDictionary<K, V2?> dic2, Func<K, V1?, V2?, R> mixer)
             where V1 : class
             where V2 : struct
         {
diff --git a/Signum.Utilities/Extensions/EnumerableExtensions.cs b/Signum.Utilities/Extensions/EnumerableExtensions.cs
index 02ba64527c..ee6fa5fba1 100644
--- a/Signum.Utilities/Extensions/EnumerableExtensions.cs
+++ b/Signum.Utilities/Extensions/EnumerableExtensions.cs
@@ -409,7 +409,7 @@ public static bool HasItems<T>(this IEnumerable<T> collection)
             return collection != null && collection.Any();
         }
 
-        public static IEnumerable<T> NotNull<T>(this IEnumerable<T> collection) where T : class
+        public static IEnumerable<T> NotNull<T>(this IEnumerable<T?> collection) where T : class
         {
             foreach (var item in collection)
             {
diff --git a/Signum.Utilities/Extensions/Extensions.cs b/Signum.Utilities/Extensions/Extensions.cs
index 9bf50b1551..df9b9c7ba4 100644
--- a/Signum.Utilities/Extensions/Extensions.cs
+++ b/Signum.Utilities/Extensions/Extensions.cs
@@ -350,9 +350,9 @@ public static IEnumerable<T> For<T>(this T start, Func<T, bool> condition, Func<
         public delegate R FuncCC<in T, R>(T input)
             where T : class
             where R : class;
-        public static IEnumerable<T> Follow<T>(this T start, FuncCC<T, T> next) where T : class
+        public static IEnumerable<T> Follow<T>(this T start, FuncCC<T, T?> next) where T : class
         {
-            for (T i = start; i != null; i = next(i))
+            for (T? i = start; i != null; i = next(i))
                 yield return i;
         }
 
diff --git a/Signum.Utilities/Extensions/StringExtensions.cs b/Signum.Utilities/Extensions/StringExtensions.cs
index e61cd499ae..013d2df83b 100644
--- a/Signum.Utilities/Extensions/StringExtensions.cs
+++ b/Signum.Utilities/Extensions/StringExtensions.cs
@@ -603,22 +603,22 @@ public static string FormatWith(this string format, object? arg0)
             return string.Format(format, arg0);
         }
 
-        public static string FormatWith(this string format, object? arg0, object arg1)
+        public static string FormatWith(this string format, object? arg0, object? arg1)
         {
             return string.Format(format, arg0, arg1);
         }
 
-        public static string FormatWith(this string format, object arg0, object arg1, object arg2)
+        public static string FormatWith(this string format, object? arg0, object? arg1, object? arg2)
         {
             return string.Format(format, arg0, arg1, arg2);
         }
 
-        public static string FormatWith(this string pattern, params object[] parameters)
+        public static string FormatWith(this string pattern, params object?[] parameters)
         {
             return string.Format(pattern, parameters);
         }
 
-        public static string FormatWith(this string format, IFormatProvider provider, params object[] args)
+        public static string FormatWith(this string format, IFormatProvider provider, params object?[] args)
         {
             return string.Format(provider, format, args);
         }

From 09ea18114734102d467444cdc9935f56492445b1 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Fri, 11 Jan 2019 19:40:09 +0100
Subject: [PATCH 07/25] not nullable in Signum.Entities

---
 Signum.Entities/Basics/Exception.cs           |  48 ++++---
 Signum.Entities/Basics/Operation.cs           |  11 +-
 Signum.Entities/Basics/OperationLog.cs        |   9 +-
 Signum.Entities/Basics/PropertyRouteEntity.cs |   7 +-
 Signum.Entities/Basics/QueryEntity.cs         |   7 +-
 Signum.Entities/Basics/SemiSymbol.cs          |  19 +--
 Signum.Entities/Basics/Symbol.cs              |   9 +-
 Signum.Entities/Basics/Type.cs                |  11 +-
 Signum.Entities/DynamicQuery/Column.cs        |  11 +-
 .../DynamicQuery/QueryDescription.cs          | 131 +++---------------
 Signum.Entities/DynamicQuery/Requests.cs      |   1 +
 .../DynamicQuery/Tokens/AsTypeToken.cs        |  10 +-
 .../DynamicQuery/Tokens/ColumnToken.cs        |   2 +-
 .../DynamicQuery/Tokens/ExtensionToken.cs     |   8 +-
 .../FieldNotificationAttributes.cs            |  29 ++--
 Signum.Entities/MList.cs                      |   2 +
 Signum.Entities/ModifiableEntity.cs           |  11 +-
 Signum.Entities/PrimaryKey.cs                 |  18 +--
 Signum.Entities/PropertyAttributes.cs         |   2 +-
 .../EntityStructuralEqualityComparer.cs       |  59 ++++----
 Signum.Entities/Reflection/Reflector.cs       |  32 ++---
 Signum.Entities/Signum.Entities.csproj        |   2 +-
 Signum.Entities/SystemTime.cs                 |   4 +-
 Signum.Entities/ValidationAttributes.cs       |  97 ++++++-------
 Signum.Entities/Validator.cs                  |  50 +++----
 25 files changed, 249 insertions(+), 341 deletions(-)

diff --git a/Signum.Entities/Basics/Exception.cs b/Signum.Entities/Basics/Exception.cs
index 372fd61e12..49c40de353 100644
--- a/Signum.Entities/Basics/Exception.cs
+++ b/Signum.Entities/Basics/Exception.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using Signum.Utilities;
 using System.Threading;
@@ -11,25 +11,27 @@ public class ExceptionEntity : Entity
     {
         public const string ExceptionDataKey = "exceptionEntity";
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
         public ExceptionEntity() { }
 
         public ExceptionEntity(Exception ex)
         {
             this.ExceptionType = ex.GetType().Name;
-            this.ExceptionMessage = ex.Message;
-            this.StackTrace = ex.StackTrace;
+            this.ExceptionMessage = ex.Message!;
+            this.StackTrace = ex.StackTrace!;
             this.ThreadId = Thread.CurrentThread.ManagedThreadId;
             ex.Data[ExceptionDataKey] = this;
             this.MachineName = System.Environment.MachineName;
             this.ApplicationName = AppDomain.CurrentDomain.FriendlyName;
         }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         public DateTime CreationDate { get; private set; } = TimeZoneManager.Now;
 
         [NotNullable, SqlDbType(Size = 100)]
-        public string ExceptionType { get; set; }
+        public string? ExceptionType { get; set; }
 
-        [NotNullable, SqlDbType(Size = int.MaxValue)]
+        [SqlDbType(Size = int.MaxValue)]
         string exceptionMessage;
         public string ExceptionMessage
         {
@@ -43,7 +45,7 @@ public string ExceptionMessage
 
         public int ExceptionMessageHash { get; private set; }
 
-        [NotNullable, SqlDbType(Size = int.MaxValue)]
+        [SqlDbType(Size = int.MaxValue)]
         string stackTrace;
         public string StackTrace
         {
@@ -59,52 +61,52 @@ public string StackTrace
 
         public int ThreadId { get; set; }
 
-        public Lite<IUserEntity> User { get; set; }
+        public Lite<IUserEntity>? User { get; set; }
 
         [SqlDbType(Size = 100)]
-        public string Environment { get; set; }
+        public string? Environment { get; set; }
 
         [SqlDbType(Size = 100)]
-        public string Version { get; set; }
+        public string? Version { get; set; }
 
         [SqlDbType(Size = 300)]
-        public string UserAgent { get; set; }
+        public string? UserAgent { get; set; }
 
         [SqlDbType(Size = int.MaxValue)]
-        public string RequestUrl { get; set; }
+        public string? RequestUrl { get; set; }
 
         [SqlDbType(Size = 100)]
-        public string ControllerName { get; set; }
+        public string? ControllerName { get; set; }
 
         [SqlDbType(Size = 100)]
-        public string ActionName { get; set; }
+        public string? ActionName { get; set; }
 
         [SqlDbType(Size = int.MaxValue)]
-        public string UrlReferer { get; set; }
+        public string? UrlReferer { get; set; }
 
         [SqlDbType(Size = 100)]
-        public string MachineName { get; set; }
+        public string? MachineName { get; set; }
 
         [SqlDbType(Size = 100)]
-        public string ApplicationName { get; set; }
+        public string? ApplicationName { get; set; }
 
         [SqlDbType(Size = 100)]
-        public string UserHostAddress { get; set; }
+        public string? UserHostAddress { get; set; }
 
         [SqlDbType(Size = 100)]
-        public string UserHostName { get; set; }
+        public string? UserHostName { get; set; }
 
         [SqlDbType(Size = int.MaxValue)]
-        public string Form { get; set; }
+        public string? Form { get; set; }
 
         [SqlDbType(Size = int.MaxValue)]
-        public string QueryString { get; set; }
+        public string? QueryString { get; set; }
 
         [SqlDbType(Size = int.MaxValue)]
-        public string Session { get; set; }
+        public string? Session { get; set; }
 
         [SqlDbType(Size = int.MaxValue)]
-        public string Data { get; set; }
+        public string? Data { get; set; }
 
         public int HResult { get; internal set; }
 
@@ -157,6 +159,7 @@ public class DeleteLogParametersEmbedded : EmbeddedEntity
         public int? PauseTime { get; set; } = 5000;
     }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     [Serializable]
     public class DeleteLogsTypeOverridesEmbedded : EmbeddedEntity
     {
@@ -169,4 +172,5 @@ public class DeleteLogsTypeOverridesEmbedded : EmbeddedEntity
         [Unit("Days"), NumberIsValidator(ComparisonType.GreaterThanOrEqualTo, 0)]
         public int? CleanLogsWithMoreThan { get; set; } = 30 * 6;
     }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 }
diff --git a/Signum.Entities/Basics/Operation.cs b/Signum.Entities/Basics/Operation.cs
index 4362253d19..b7da310566 100644
--- a/Signum.Entities/Basics/Operation.cs
+++ b/Signum.Entities/Basics/Operation.cs
@@ -205,6 +205,13 @@ public interface DeleteSymbol<in T> : IEntityOperationSymbolContainer<T>
     [Serializable]
     public class OperationInfo
     {
+        public OperationInfo(OperationSymbol symbol, OperationType type)
+        {
+            this.OperationSymbol = symbol;
+            this.OperationType = type;
+        }
+
+
         public OperationSymbol OperationSymbol { get; internal set; }
         public OperationType OperationType { get; internal set; }
 
@@ -214,8 +221,8 @@ public class OperationInfo
         public bool? HasCanExecute { get; internal set; }
 
         public bool Returns { get; internal set; }
-        public Type ReturnType { get; internal set; }
-        public Type BaseType { get; internal set; }
+        public Type? ReturnType { get; internal set; }
+        public Type? BaseType { get; internal set; }
 
         public override string ToString()
         {
diff --git a/Signum.Entities/Basics/OperationLog.cs b/Signum.Entities/Basics/OperationLog.cs
index a0a18c3311..61b91df511 100644
--- a/Signum.Entities/Basics/OperationLog.cs
+++ b/Signum.Entities/Basics/OperationLog.cs
@@ -1,22 +1,21 @@
-using System;
+using System;
 using Signum.Utilities;
 using System.Linq.Expressions;
 
 namespace Signum.Entities.Basics
 {
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     [Serializable, EntityKind(EntityKind.System, EntityData.Transactional), TicksColumn(false), InTypeScript(Undefined = false)]
     public class OperationLogEntity : Entity
     {
         [ImplementedByAll]
-        public Lite<IEntity> Target { get; set; }
+        public Lite<IEntity>? Target { get; set; }
 
         [ImplementedByAll]
-        public Lite<IEntity> Origin { get; set; }
+        public Lite<IEntity>? Origin { get; set; }
 
-        [NotNullValidator]
         public OperationSymbol Operation { get; set; }
 
-        [NotNullValidator]
         public Lite<IUserEntity> User { get; set; }
 
         public DateTime Start { get; set; }
diff --git a/Signum.Entities/Basics/PropertyRouteEntity.cs b/Signum.Entities/Basics/PropertyRouteEntity.cs
index 17f1380663..88aedb04ab 100644
--- a/Signum.Entities/Basics/PropertyRouteEntity.cs
+++ b/Signum.Entities/Basics/PropertyRouteEntity.cs
@@ -1,14 +1,13 @@
-using System;
+using System;
 using Signum.Utilities;
 using System.Linq.Expressions;
 
 namespace Signum.Entities.Basics
 {
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     [Serializable, EntityKind(EntityKind.SystemString, EntityData.Master), TicksColumn(false), InTypeScript(Undefined = false)]
     public class PropertyRouteEntity : Entity
     {
-        public PropertyRouteEntity() { }
-
         [field: Ignore]
         PropertyRoute route;
         [HiddenProperty]
@@ -18,7 +17,7 @@ public PropertyRoute Route
             set { route = value; }
         }
 
-        [StringLengthValidator(AllowNulls = false, Min = 1, Max = 100)]
+        [StringLengthValidator(Min = 1, Max = 100)]
         public string Path { get; set; }
 
         [NotNullValidator]
diff --git a/Signum.Entities/Basics/QueryEntity.cs b/Signum.Entities/Basics/QueryEntity.cs
index 15bf38704d..aba91f425f 100644
--- a/Signum.Entities/Basics/QueryEntity.cs
+++ b/Signum.Entities/Basics/QueryEntity.cs
@@ -1,14 +1,15 @@
-using System;
+using System;
 using Signum.Utilities;
 using System.Linq.Expressions;
 
 namespace Signum.Entities.Basics
 {
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     [Serializable, EntityKind(EntityKind.SystemString, EntityData.Master), TicksColumn(false), InTypeScript(Undefined = false)]
     public class QueryEntity : Entity
     {
         [UniqueIndex]
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 100)]
+        [StringLengthValidator(Min = 3, Max = 100)]
         public string Key { get; set; }
 
         public static Func<QueryEntity, Implementations> GetEntityImplementations;
@@ -20,4 +21,4 @@ public override string ToString()
             return ToStringExpression.Evaluate(this);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Entities/Basics/SemiSymbol.cs b/Signum.Entities/Basics/SemiSymbol.cs
index 312bb333d0..9bcae8c658 100644
--- a/Signum.Entities/Basics/SemiSymbol.cs
+++ b/Signum.Entities/Basics/SemiSymbol.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -7,6 +7,7 @@
 
 namespace Signum.Entities.Basics
 {
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     [Serializable, EntityKind(EntityKind.SystemString, EntityData.Master), TicksColumn(false)]
     public abstract class SemiSymbol : Entity
     {
@@ -44,28 +45,28 @@ public SemiSymbol(Type declaringType, string fieldName)
             var dic = FromDatabase.TryGetC(this.GetType());
             if (dic != null)
             {
-                SemiSymbol semiS = dic.TryGetC(this.Key);
+                SemiSymbol? semiS = dic.TryGetC(this.Key!);
                 if (semiS != null)
                     this.SetIdAndProps(semiS);
             }
         }
 
         [Ignore]
-        FieldInfo fieldInfo;
+        FieldInfo? fieldInfo;
         [HiddenProperty]
-        public FieldInfo FieldInfo
+        public FieldInfo? FieldInfo
         {
             get { return fieldInfo; }
             internal set { fieldInfo = value; }
         }
 
         [UniqueIndex(AllowMultipleNulls = true)]
-        [StringLengthValidator(AllowNulls = true, Min = 3, Max = 200)]
-        public string Key { get; set; }
+        [StringLengthValidator(Min = 3, Max = 200)]
+        public string? Key { get; set; }
 
-        internal string NiceToString()
+        internal string? NiceToString()
         {
-            return this.FieldInfo.NiceName();
+            return this.FieldInfo?.NiceName();
         }
 
 
@@ -92,7 +93,7 @@ static SemiSymbol()
                 .Any(a => typeof(SemiSymbol).IsAssignableFrom(a.FieldType)) ? DescriptionOptions.Members : (DescriptionOptions?)null;
         }
 
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 100)]
+        [StringLengthValidator(Min = 3, Max = 100)]
         public string Name { get; set; }
 
         static Expression<Func<SemiSymbol, string>> ToStringExpression = e => e.Name;
diff --git a/Signum.Entities/Basics/Symbol.cs b/Signum.Entities/Basics/Symbol.cs
index e2ec03fff6..3c25ebf05c 100644
--- a/Signum.Entities/Basics/Symbol.cs
+++ b/Signum.Entities/Basics/Symbol.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq.Expressions;
 using System.Reflection;
@@ -6,6 +6,7 @@
 
 namespace Signum.Entities
 {
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     [Serializable, EntityKind(EntityKind.SystemString, EntityData.Master), TicksColumn(false), InTypeScript(Undefined = false)]
     public abstract class Symbol : Entity
     {
@@ -33,8 +34,8 @@ public Symbol(Type declaringType, string fieldName)
             catch (Exception e) when (StartParameters.IgnoredCodeErrors != null)
             {
                 //Could happend if Dynamic code has a duplicated name
-                this.fieldInfo = null;
-                this.Key = null;
+                this.fieldInfo = null!;
+                this.Key = null!;
                 StartParameters.IgnoredCodeErrors.Add(e);
                 return;
             }
@@ -59,7 +60,7 @@ public FieldInfo FieldInfo
 
 
         [UniqueIndex]
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 200)]
+        [StringLengthValidator(Min = 3, Max = 200)]
         public string Key { get; set; }
 
         static Expression<Func<Symbol, string>> ToStringExpression = e => e.Key;
diff --git a/Signum.Entities/Basics/Type.cs b/Signum.Entities/Basics/Type.cs
index 35803e32ce..7d05422b92 100644
--- a/Signum.Entities/Basics/Type.cs
+++ b/Signum.Entities/Basics/Type.cs
@@ -1,22 +1,23 @@
-using System;
+using System;
 using Signum.Utilities;
 using System.Linq.Expressions;
 
 namespace Signum.Entities.Basics
 {
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     [Serializable, EntityKind(EntityKind.System, EntityData.Master), TicksColumn(false), InTypeScript(Undefined = false)]
     public class TypeEntity : Entity
     {
-        [StringLengthValidator(AllowNulls = false, Max = 200), UniqueIndex]
+        [StringLengthValidator(Max = 200), UniqueIndex]
         public string TableName { get; set; }
 
-        [StringLengthValidator(AllowNulls = false, Max = 200), UniqueIndex]
+        [StringLengthValidator(Max = 200), UniqueIndex]
         public string CleanName { get; set; }
 
-        [StringLengthValidator(AllowNulls = false, Max = 200)]
+        [StringLengthValidator(Max = 200)]
         public string Namespace { get; set; }
 
-        [StringLengthValidator(AllowNulls = false, Max = 200)]
+        [StringLengthValidator(Max = 200)]
         public string ClassName { get; set; }
 
         static Expression<Func<TypeEntity, string>> FullClassNameExpression =
diff --git a/Signum.Entities/DynamicQuery/Column.cs b/Signum.Entities/DynamicQuery/Column.cs
index efede96a8b..1bc2ba2e5b 100644
--- a/Signum.Entities/DynamicQuery/Column.cs
+++ b/Signum.Entities/DynamicQuery/Column.cs
@@ -6,22 +6,17 @@ namespace Signum.Entities.DynamicQuery
     [Serializable]
     public class Column
     {
-        string displayName;
-        public string DisplayName
-        {
-            get { return displayName; }
-            set { displayName = value; }
-        }
+        public string? DisplayName { get; set; }
 
         QueryToken token;
         public QueryToken Token { get { return token; } }
 
         public bool IsVisible = true;
 
-        public Column(QueryToken token, string displayName)
+        public Column(QueryToken token, string? displayName)
         {
             this.token = token;
-            this.displayName = displayName;
+            this.DisplayName = displayName;
         }
 
         public Column(ColumnDescription cd, object queryName)
diff --git a/Signum.Entities/DynamicQuery/QueryDescription.cs b/Signum.Entities/DynamicQuery/QueryDescription.cs
index 01f36e8eb5..f71a3f7424 100644
--- a/Signum.Entities/DynamicQuery/QueryDescription.cs
+++ b/Signum.Entities/DynamicQuery/QueryDescription.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.Serialization;
@@ -8,85 +8,33 @@ namespace Signum.Entities.DynamicQuery
     [Serializable]
     public class QueryDescription
     {
-        object queryName;
-        public object QueryName
-        {
-            get { return queryName; }
-        }
-
-        List<ColumnDescription> columns;
-        public List<ColumnDescription> Columns
-        {
-            get { return columns; }
-        }
-
-        public QueryDescription() { }
-
+        public object QueryName { get; private set; }
+        public List<ColumnDescription> Columns { get; private set; }
+        
         public QueryDescription(object queryName, List<ColumnDescription> columns)
         {
-            this.queryName = queryName;
-            this.columns = columns;
+            this.QueryName = queryName;
+            this.Columns = columns;
         }
     }
 
     [Serializable]
-    public class ColumnDescription :ISerializable
+    public class ColumnDescription
     {
         public const string Entity = "Entity";
+        public string Name { get; internal set; }
+        public Type Type { get; internal set; }
+        public string? Unit { get; internal set; }
+        public string? Format { get; internal set; }
+        public Implementations? Implementations { get; internal set; }
+        public PropertyRoute[]? PropertyRoutes { get; internal set; }
+        public string DisplayName { get; internal set; }
 
-        string name;
-        public string Name
-        {
-            get { return name; }
-            internal set { name = value; }
-        }
-
-        Type type;
-        public Type Type
-        {
-            get { return type; }
-            internal set { type = value; }
-        }
-
-        string unit;
-        public string Unit
-        {
-            get { return unit; }
-            internal set { unit = value; }
-        }
-
-        string format;
-        public string Format
-        {
-            get { return format; }
-            internal set { format = value; }
-        }
-
-        Implementations? implementations;
-        public Implementations? Implementations
-        {
-            get { return implementations; }
-            internal set { implementations = value; }
-        }
-
-        PropertyRoute[] propertyRoutes;
-        public PropertyRoute[] PropertyRoutes
-        {
-            get { return propertyRoutes; }
-            internal set { propertyRoutes = value; }
-        }
-
-        string displayName;
-        public string DisplayName
-        {
-            get { return displayName; }
-            internal set { displayName = value; }
-        }
-
-        public ColumnDescription(string name, Type type)
+        public ColumnDescription(string name, Type type, string displayName)
         {
             this.Name = name;
             this.Type = type;
+            this.DisplayName = displayName;
         }
 
         public bool IsEntity
@@ -96,52 +44,7 @@ public bool IsEntity
 
         public override string ToString()
         {
-            return DisplayName;
-        }
-
-        public void GetObjectData(SerializationInfo info, StreamingContext context)
-        {
-            info.AddValue("name", name);
-            info.AddValue("type", type.AssemblyQualifiedName);
-
-            if (unit != null)
-                info.AddValue("unit", unit);
-
-            if (format != null)
-                info.AddValue("format", format);
-
-            if (implementations != null)
-                info.AddValue("implementations", implementations);
-
-            if (propertyRoutes != null)
-            {
-                if (propertyRoutes.Length == 1)
-                    info.AddValue("propertyRoute", propertyRoutes.Single());
-                else
-                    info.AddValue("propertyRoutes", propertyRoutes);
-            }
-
-            if (displayName != null)
-                info.AddValue("displayName", displayName);
-        }
-
-
-        ColumnDescription(SerializationInfo info, StreamingContext context)
-        {
-            foreach (SerializationEntry entry in info)
-            {
-                switch (entry.Name)
-                {
-                    case "name": name = (string)entry.Value; break;
-                    case "type": type = Type.GetType((string)entry.Value); break;
-                    case "unit": unit = (string)entry.Value; break;
-                    case "format": format = (string)entry.Value; break;
-                    case "implementations": implementations = (Implementations)entry.Value; break;
-                    case "propertyRoutes": propertyRoutes = (PropertyRoute[])entry.Value; break;
-                    case "propertyRoute": propertyRoutes = new[] { (PropertyRoute)entry.Value }; break;
-                    case "displayName": displayName = (string)entry.Value; break;
-                }
-            }
+            return DisplayName!;
         }
     }
 }
diff --git a/Signum.Entities/DynamicQuery/Requests.cs b/Signum.Entities/DynamicQuery/Requests.cs
index 326f3f6e50..c5ac1a62f7 100644
--- a/Signum.Entities/DynamicQuery/Requests.cs
+++ b/Signum.Entities/DynamicQuery/Requests.cs
@@ -3,6 +3,7 @@
 using System.Linq;
 using Signum.Utilities;
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
 namespace Signum.Entities.DynamicQuery
 {
     [Serializable]
diff --git a/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs b/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs
index 62ac1ac70e..40ab75ba78 100644
--- a/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs
@@ -69,13 +69,13 @@ public override string? Unit
 
         public override string? IsAllowed()
         {
-            var parent = parent.IsAllowed();
-            var routes = GetPropertyRoute()!.IsAllowed();
+            var parentAllowed = this.parent.IsAllowed();
+            var routeAllowed = GetPropertyRoute()!.IsAllowed();
 
-            if (parent.HasText() && routes.HasText())
-                QueryTokenMessage.And.NiceToString().CombineIfNotEmpty(parent, routes);
+            if (parentAllowed.HasText() && routeAllowed.HasText())
+                QueryTokenMessage.And.NiceToString().CombineIfNotEmpty(parentAllowed, routeAllowed);
 
-            return parent ?? routes;
+            return parentAllowed ?? routeAllowed;
         }
 
         public override PropertyRoute? GetPropertyRoute()
diff --git a/Signum.Entities/DynamicQuery/Tokens/ColumnToken.cs b/Signum.Entities/DynamicQuery/Tokens/ColumnToken.cs
index e4b214e763..7730f1c733 100644
--- a/Signum.Entities/DynamicQuery/Tokens/ColumnToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/ColumnToken.cs
@@ -117,7 +117,7 @@ protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
             if (Column.PropertyRoutes != null)
                 return Column.PropertyRoutes[0]; //HACK: compatibility with IU entitiy elements
 
-            Type type = Lite.Extract(Type); // Useful?
+            Type? type = Lite.Extract(Type); // Useful?
             if (type != null && type.IsIEntity())
             {
                 var implementations = Column.Implementations;
diff --git a/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs b/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
index f0f44998c6..b3c64cd87f 100644
--- a/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
@@ -109,12 +109,12 @@ protected override Expression BuildExpressionInternal(BuildExpressionContext con
         string? isAllowed;
         public override string? IsAllowed()
         {
-            string? parent = parent.IsAllowed();
+            string? parentAllowed = this.parent.IsAllowed();
 
-            if (isAllowed.HasText() && parent.HasText())
-                return QueryTokenMessage.And.NiceToString().Combine(isAllowed!, parent!);
+            if (isAllowed.HasText() && parentAllowed.HasText())
+                return QueryTokenMessage.And.NiceToString().Combine(isAllowed!, parentAllowed!);
 
-            return isAllowed ?? parent;
+            return isAllowed ?? parentAllowed;
         }
 
         public override QueryToken Clone()
diff --git a/Signum.Entities/FieldNotificationAttributes.cs b/Signum.Entities/FieldNotificationAttributes.cs
index a3dff7f371..777d981ff6 100644
--- a/Signum.Entities/FieldNotificationAttributes.cs
+++ b/Signum.Entities/FieldNotificationAttributes.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
@@ -26,9 +26,9 @@ internal static class AttributeManager<T>
         where T : Attribute
     {
         //Consider using ImmutableAVLTree instead
-        readonly static Dictionary<Type, TypeAttributePack> fieldAndProperties = new Dictionary<Type, TypeAttributePack>();
+        readonly static Dictionary<Type, TypeAttributePack?> fieldAndProperties = new Dictionary<Type, TypeAttributePack>();
 
-        static TypeAttributePack GetFieldsAndProperties(Type type)
+        static TypeAttributePack? GetFieldsAndProperties(Type type)
         {
             lock (fieldAndProperties)
             {
@@ -39,18 +39,17 @@ static TypeAttributePack GetFieldsAndProperties(Type type)
                     if (list.Count == 0)
                         return null;
 
-                    return new TypeAttributePack
-                    {
-                        Fields = list.Select(fi => ReflectionTools.CreateGetterUntyped(type, fi)).ToArray(),
-                        PropertyNames = list.Select(fi => Reflector.FindPropertyInfo(fi).Name).ToArray()
-                    };
+                    return new TypeAttributePack(
+                        fields: list.Select(fi => ReflectionTools.CreateGetterUntyped(type, fi)).ToArray(),
+                        propertyNames: list.Select(fi => Reflector.FindPropertyInfo(fi).Name).ToArray()
+                    );
                 });
             }
         }
 
         public static bool FieldContainsAttribute(Type type, PropertyInfo pi)
         {
-            TypeAttributePack pack = GetFieldsAndProperties(type);
+            TypeAttributePack? pack = GetFieldsAndProperties(type);
 
             if (pack == null)
                 return false;
@@ -62,7 +61,7 @@ public static bool FieldContainsAttribute(Type type, PropertyInfo pi)
 
         public static object[] FieldsWithAttribute(ModifiableEntity entity)
         {
-            TypeAttributePack pack = GetFieldsAndProperties(entity.GetType());
+            TypeAttributePack? pack = GetFieldsAndProperties(entity.GetType());
 
             if (pack == null)
                 return EmptyArray;
@@ -70,9 +69,9 @@ public static object[] FieldsWithAttribute(ModifiableEntity entity)
             return pack.Fields.Select(f => f(entity)).ToArray();
         }
 
-        public static string FindPropertyName(ModifiableEntity entity, object fieldValue)
+        public static string? FindPropertyName(ModifiableEntity entity, object fieldValue)
         {
-            TypeAttributePack pack = GetFieldsAndProperties(entity.GetType());
+            TypeAttributePack? pack = GetFieldsAndProperties(entity.GetType());
 
             if (pack == null)
                 return null;
@@ -90,5 +89,11 @@ internal class TypeAttributePack
     {
         public Func<object, object>[] Fields;
         public string[] PropertyNames;
+
+        public TypeAttributePack(Func<object, object>[] fields, string[] propertyNames)
+        {
+            Fields = fields;
+            PropertyNames = propertyNames;
+        }
     }
 }
diff --git a/Signum.Entities/MList.cs b/Signum.Entities/MList.cs
index a70f8c47ba..db3590bf3b 100644
--- a/Signum.Entities/MList.cs
+++ b/Signum.Entities/MList.cs
@@ -780,6 +780,7 @@ public void AssignAndPostRetrieving(IMListPrivate newList)
     }
 
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     public class MListElement<E, V> where E : Entity
     {
         public PrimaryKey RowId { get; set; }
@@ -792,6 +793,7 @@ public override string ToString()
             return $"MListEntity: ({nameof(RowId)}:{RowId}, {nameof(Order)}:{Order}, {nameof(Parent)}:{Parent}, {nameof(Element)}:{Element})";
         }
     }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
     public interface IMListPrivate
     {
diff --git a/Signum.Entities/ModifiableEntity.cs b/Signum.Entities/ModifiableEntity.cs
index 0fdf2ab85e..a8eb69c778 100644
--- a/Signum.Entities/ModifiableEntity.cs
+++ b/Signum.Entities/ModifiableEntity.cs
@@ -174,7 +174,7 @@ protected virtual void RebindEvents()
 
         protected virtual void ChildCollectionChanged(object sender, NotifyCollectionChangedEventArgs args)
         {
-            string propertyName = AttributeManager<NotifyCollectionChangedAttribute>.FindPropertyName(this, sender);
+            string? propertyName = AttributeManager<NotifyCollectionChangedAttribute>.FindPropertyName(this, sender);
             if (propertyName != null)
                 NotifyPrivate(propertyName);
 
@@ -327,7 +327,7 @@ public string? Error
 
         public string? PropertyCheck(string propertyName)
         {
-            IPropertyValidator pp = Validator.TryGetPropertyValidator(GetType(), propertyName);
+            IPropertyValidator? pp = Validator.TryGetPropertyValidator(GetType(), propertyName);
 
             if (pp == null)
                 return null; //Hidden properties
@@ -345,7 +345,7 @@ protected static void Validate<T>(Expression<Func<T, object>> property, Func<T,
             Validator.PropertyValidator(property).StaticPropertyValidation += validate;
         }
 
-        public Dictionary<Guid, IntegrityCheck> FullIntegrityCheck()
+        public Dictionary<Guid, IntegrityCheck>? FullIntegrityCheck()
         {
             var graph = GraphExplorer.FromRoot(this);
             return GraphExplorer.FullIntegrityCheck(graph);
@@ -450,10 +450,11 @@ public IntegrityCheckWithEntity(IntegrityCheck integrityCheck, ModifiableEntity
 
         public override string ToString()
         {
+            var validators = Validator.GetPropertyValidators(Entity.GetType());
             return $"{IntegrityCheck.Errors.Count} errors in {" ".CombineIfNotEmpty(IntegrityCheck.Type.Name, IntegrityCheck.Id)}\r\n"
                   + IntegrityCheck.Errors.ToString(kvp => "    {0} ({1}): {2}".FormatWith(
-                      kvp.Key, 
-                      Validator.TryGetPropertyValidator(Entity.GetType(), kvp.Key).GetValueUntyped(Entity), 
+                      kvp.Key,
+                      validators.GetOrThrow(kvp.Key).GetValueUntyped(Entity), 
                       kvp.Value), 
                       "\r\n");
         }
diff --git a/Signum.Entities/PrimaryKey.cs b/Signum.Entities/PrimaryKey.cs
index b08c44416f..d40f79dc6e 100644
--- a/Signum.Entities/PrimaryKey.cs
+++ b/Signum.Entities/PrimaryKey.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Globalization;
@@ -38,7 +38,7 @@ public static void Import(Dictionary<Type, Type> dic)
             PrimaryKeyType.ImportDefinitions(dic);
         }
 
-        public readonly string VariableName; //Used for Sync scenarios
+        public readonly string? VariableName; //Used for Sync scenarios
         public readonly IComparable Object;
 
         public PrimaryKey(IComparable obj)
@@ -226,9 +226,9 @@ public static explicit operator DateTime(PrimaryKey key)
 
         public static bool TryParse(string value, Type entityType, out PrimaryKey id)
         {
-            if (ReflectionTools.TryParse(value, Type(entityType), out object val))
+            if (ReflectionTools.TryParse(value, Type(entityType), out object? val))
             {
-                id = new PrimaryKey((IComparable)val);
+                id = new PrimaryKey((IComparable)val!);
                 return true;
             }
             else
@@ -240,7 +240,7 @@ public static bool TryParse(string value, Type entityType, out PrimaryKey id)
 
         public static PrimaryKey Parse(string value, Type entityType)
         {
-            return new PrimaryKey((IComparable)ReflectionTools.Parse(value, Type(entityType)));
+            return new PrimaryKey((IComparable)ReflectionTools.Parse(value, Type(entityType))!);
         }
 
         public static PrimaryKey? Wrap(IComparable value)
@@ -251,7 +251,7 @@ public static PrimaryKey Parse(string value, Type entityType)
             return new PrimaryKey(value);
         }
 
-        public static IComparable Unwrap(PrimaryKey? id)
+        public static IComparable? Unwrap(PrimaryKey? id)
         {
             if (id == null)
                 return null;
@@ -259,7 +259,7 @@ public static IComparable Unwrap(PrimaryKey? id)
             return id.Value.Object;
         }
 
-        public static string UnwrapToString(PrimaryKey? id)
+        public static string? UnwrapToString(PrimaryKey? id)
         {
             if (id == null)
                 return null;
@@ -274,8 +274,8 @@ public string ToString(string format)
 
         private PrimaryKey(SerializationInfo info, StreamingContext ctxt)
         {
-            this.Object = null;
-            this.VariableName = null;
+            this.Object = null!;
+            this.VariableName = null!;
             foreach (SerializationEntry item in info)
             {
                 switch (item.Name)
diff --git a/Signum.Entities/PropertyAttributes.cs b/Signum.Entities/PropertyAttributes.cs
index 3982a3005b..6c649a52f8 100644
--- a/Signum.Entities/PropertyAttributes.cs
+++ b/Signum.Entities/PropertyAttributes.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 
 namespace Signum.Entities
diff --git a/Signum.Entities/Reflection/EntityStructuralEqualityComparer.cs b/Signum.Entities/Reflection/EntityStructuralEqualityComparer.cs
index 230b5de1eb..9d9a5dd53c 100644
--- a/Signum.Entities/Reflection/EntityStructuralEqualityComparer.cs
+++ b/Signum.Entities/Reflection/EntityStructuralEqualityComparer.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
@@ -11,32 +11,32 @@ namespace Signum.Entities.Reflection
 
     public interface IEqualityComparerResolver
     {
-        IEqualityComparer GetEqualityComparer(Type type, PropertyInfo pi);
+        IEqualityComparer GetEqualityComparer(Type type, PropertyInfo? pi);
     }
 
     public interface ICompletableComparer
     {
-        void Complete(IEqualityComparerResolver resolver, PropertyInfo pi);
+        void Complete(IEqualityComparerResolver resolver, PropertyInfo? pi);
     }
 
     public class EntityStructuralEqualityComparer<T> : EqualityComparer<T>, ICompletableComparer
         where T : ModifiableEntity
     {
         public Dictionary<string, PropertyComparer<T>> Properties;
-        public Dictionary<Type, IEqualityComparer> Mixins;
+        public Dictionary<Type, IEqualityComparer>? Mixins;
 
         public EntityStructuralEqualityComparer()
         {
+            this.Properties = null!;
         }
 
-        public void Complete(IEqualityComparerResolver resolver, PropertyInfo pi)
+        public void Complete(IEqualityComparerResolver resolver, PropertyInfo? pi)
         {
             Properties = MemberEntryFactory.GenerateList<T>(MemberOptions.Properties | MemberOptions.Typed | MemberOptions.Getter)
                 .Where(p => !((PropertyInfo)p.MemberInfo).HasAttribute<HiddenPropertyAttribute>())
-               .ToDictionary(a => a.Name, a => new PropertyComparer<T>((PropertyInfo)a.MemberInfo, a.Getter)
-               {
-                   Comparer = resolver.GetEqualityComparer(((PropertyInfo)a.MemberInfo).PropertyType, ((PropertyInfo)a.MemberInfo))
-               });
+               .ToDictionary(a => a.Name, a => new PropertyComparer<T>(
+                   propertyInfo: (PropertyInfo)a.MemberInfo, a.Getter!, 
+               comparer: resolver.GetEqualityComparer(((PropertyInfo)a.MemberInfo).PropertyType, (PropertyInfo)a.MemberInfo)));
 
             Mixins = !typeof(Entity).IsAssignableFrom(typeof(T)) ? null :
                 MixinDeclarations.GetMixinDeclarations(typeof(T)).ToDictionary(t => t, t => resolver.GetEqualityComparer(t, null));
@@ -97,20 +97,22 @@ public override int GetHashCode(T obj)
     }
 
     public class ClassStructuralEqualityComparer<T> : EqualityComparer<T>, ICompletableComparer
+        where T: object
     {
         public Dictionary<string, PropertyComparer<T>> Properties;
 
         public ClassStructuralEqualityComparer()
         {
+            this.Properties = null!;
         }
 
-        public void Complete(IEqualityComparerResolver resolver, PropertyInfo pi)
+        public void Complete(IEqualityComparerResolver resolver, PropertyInfo? pi)
         {
             Properties = MemberEntryFactory.GenerateList<T>(MemberOptions.Properties | MemberOptions.Typed | MemberOptions.Getter)
-              .ToDictionary(a => a.Name, a => new PropertyComparer<T>((PropertyInfo)a.MemberInfo, a.Getter)
-              {
-                  Comparer = resolver.GetEqualityComparer(((PropertyInfo)a.MemberInfo).PropertyType, ((PropertyInfo)a.MemberInfo))
-              }); ;
+              .ToDictionary(a => a.Name, a => new PropertyComparer<T>(
+                  propertyInfo: (PropertyInfo)a.MemberInfo,
+                  getter: a.Getter!,
+                  comparer: resolver.GetEqualityComparer(((PropertyInfo)a.MemberInfo).PropertyType, (PropertyInfo)a.MemberInfo)));
         }
 
         public override bool Equals(T x, T y)
@@ -144,23 +146,22 @@ public override int GetHashCode(T obj)
 
             return result;
         }
-
-
     }
 
     public class PropertyComparer<T>
     {
-        public PropertyInfo MemberInfo { get; set; }
-        public Func<T, object> Getter { get; set; }
+        public PropertyInfo PropertyInfo { get; set; }
+        public Func<T, object?> Getter { get; set; }
         public IEqualityComparer Comparer { get; set; }
 
-        public PropertyComparer(PropertyInfo memberInfo, Func<T, object> getter)
+        public PropertyComparer(PropertyInfo propertyInfo, Func<T, object?> getter, IEqualityComparer comparer)
         {
+            this.PropertyInfo = propertyInfo;
             this.Getter = getter;
-            this.MemberInfo = memberInfo;
+            this.Comparer = comparer;
         }
 
-        public override string ToString() => $"{MemberInfo} -> {Comparer}";
+        public override string ToString() => $"{PropertyInfo} -> {Comparer}";
     }
 
     public class SortedListEqualityComparer<T> : EqualityComparer<IList<T>>, ICompletableComparer
@@ -169,9 +170,10 @@ public class SortedListEqualityComparer<T> : EqualityComparer<IList<T>>, IComple
 
         public SortedListEqualityComparer()
         {
+            this.ElementComparer = null!;
         }
 
-        public void Complete(IEqualityComparerResolver resolver, PropertyInfo pi)
+        public void Complete(IEqualityComparerResolver resolver, PropertyInfo? pi)
         {
             ElementComparer = (IEqualityComparer<T>)resolver.GetEqualityComparer(typeof(T), pi);
         }
@@ -214,9 +216,10 @@ public class UnsortedListEqualityComparer<T> : EqualityComparer<IList<T>>, IComp
 
         public UnsortedListEqualityComparer()
         {
+            this.ElementComparer = null!;
         }
 
-        public void Complete(IEqualityComparerResolver resolver, PropertyInfo pi)
+        public void Complete(IEqualityComparerResolver resolver, PropertyInfo? pi)
         {
             ElementComparer = (IEqualityComparer<T>)resolver.GetEqualityComparer(typeof(T), pi);
         }
@@ -264,8 +267,8 @@ public override int GetHashCode(IList<T> obj)
 
     public abstract class EqualityComparerResolverWithCache : IEqualityComparerResolver
     {
-        Dictionary<(Type, PropertyInfo), IEqualityComparer> cache = new Dictionary<(Type, PropertyInfo), IEqualityComparer>();
-        public virtual IEqualityComparer GetEqualityComparer(Type type, PropertyInfo pi)
+        Dictionary<(Type, PropertyInfo?), IEqualityComparer> cache = new Dictionary<(Type, PropertyInfo?), IEqualityComparer>();
+        public virtual IEqualityComparer GetEqualityComparer(Type type, PropertyInfo? pi)
         {
             if (cache.TryGetValue((type, pi), out var comparer))
                 return comparer;
@@ -277,16 +280,16 @@ public virtual IEqualityComparer GetEqualityComparer(Type type, PropertyInfo pi)
                 if (comp is ICompletableComparer cc)
                     cc.Complete(this, pi);
 
-                return comp;
+                return comp! /*CSBUG*/;
             }
         }
 
-        protected abstract IEqualityComparer GetEqualityComparerInternal(Type type, PropertyInfo pi);
+        protected abstract IEqualityComparer GetEqualityComparerInternal(Type type, PropertyInfo? pi);
     }
 
     public class DefaultEqualityComparerResolver : EqualityComparerResolverWithCache
     {
-        protected override IEqualityComparer GetEqualityComparerInternal(Type type, PropertyInfo pi)
+        protected override IEqualityComparer GetEqualityComparerInternal(Type type, PropertyInfo? pi)
         {
             if (typeof(ModifiableEntity).IsAssignableFrom(type))
             {
diff --git a/Signum.Entities/Reflection/Reflector.cs b/Signum.Entities/Reflection/Reflector.cs
index a797c556ba..495d6658ce 100644
--- a/Signum.Entities/Reflection/Reflector.cs
+++ b/Signum.Entities/Reflection/Reflector.cs
@@ -209,7 +209,7 @@ public static MemberInfo[] GetMemberListUntyped(LambdaExpression lambdaToField)
             if (e is UnaryExpression ue && ue.NodeType == ExpressionType.Convert && ue.Type == typeof(object))
                 e = ue.Operand;
 
-            MemberInfo[] result = GetMemberListBase(e);
+            MemberInfo[] result = GetMemberListBase(e! /*CSBUG*/);
 
             return result;
         }
@@ -219,7 +219,7 @@ public static MemberInfo[] GetMemberListBase(Expression e)
             return e.Follow(NextExpression).Select(GetMember).NotNull().Reverse().ToArray();
         }
 
-        static Expression NextExpression(Expression e)
+        static Expression? NextExpression(Expression e)
         {
             switch (e.NodeType)
             {
@@ -244,7 +244,7 @@ static Expression NextExpression(Expression e)
 
         static readonly string[] collectionMethods = new[] { "Element" };
 
-        static MemberInfo GetMember(Expression e)
+        static MemberInfo? GetMember(Expression e)
         {
             switch (e.NodeType)
             {
@@ -284,11 +284,11 @@ internal static FieldInfo FindFieldInfo(Type type, PropertyInfo value)
         }
 
         static readonly BindingFlags privateFlags = BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.NonPublic;
-        public static FieldInfo TryFindFieldInfo(Type type, PropertyInfo pi)
+        public static FieldInfo? TryFindFieldInfo(Type type, PropertyInfo pi)
         {
-            string prefix = pi.DeclaringType != type && pi.DeclaringType.IsInterface ? pi.DeclaringType.FullName + "." : null;
+            string? prefix = pi.DeclaringType != type && pi.DeclaringType.IsInterface ? pi.DeclaringType.FullName + "." : null;
 
-            FieldInfo fi = null;
+            FieldInfo? fi = null;
             for (Type tempType = type; tempType != null && fi == null; tempType = tempType.BaseType)
             {
                 fi = tempType.GetField("<" + pi.Name + ">k__BackingField", privateFlags) ??
@@ -323,13 +323,13 @@ public static PropertyInfo FindPropertyInfo(FieldInfo fi)
             return pi;
         }
 
-        public static PropertyInfo TryFindPropertyInfo(FieldInfo fi)
+        public static PropertyInfo? TryFindPropertyInfo(FieldInfo fi)
         {
             using (HeavyProfiler.LogNoStackTrace("TryFindPropertyInfo", () => fi.Name))
             {
                 const BindingFlags flags = BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
 
-                string propertyName = null;
+                string? propertyName = null;
                 if (fi.Name.StartsWith("<"))
                 {
                     CheckSignumProcessed(fi);
@@ -358,11 +358,11 @@ public static PropertyInfo TryFindPropertyInfo(FieldInfo fi)
 
         public static bool QueryableProperty(Type type, PropertyInfo pi)
         {
-            QueryablePropertyAttribute spa = pi.GetCustomAttribute<QueryablePropertyAttribute>();
+            QueryablePropertyAttribute? spa = pi.GetCustomAttribute<QueryablePropertyAttribute>();
             if (spa != null)
                 return spa.AvailableForQueries;
 
-            FieldInfo fi = TryFindFieldInfo(type, pi);
+            FieldInfo? fi = TryFindFieldInfo(type, pi);
             if (fi != null && !fi.HasAttribute<IgnoreAttribute>() && !pi.HasAttribute<IgnoreAttribute>())
                 return true;
 
@@ -372,7 +372,7 @@ public static bool QueryableProperty(Type type, PropertyInfo pi)
             return false;
         }
 
-        public static Func<IFormattable, string> GetPropertyFormatter(string format, string unitName)
+        public static Func<IFormattable?, string?> GetPropertyFormatter(string format, string unitName)
         {
             if (format != null)
             {
@@ -390,7 +390,7 @@ public static Func<IFormattable, string> GetPropertyFormatter(string format, str
             }
         }
 
-        public static string FormatString(PropertyRoute route)
+        public static string? FormatString(PropertyRoute route)
         {
             PropertyRoute simpleRoute = route.SimplifyToProperty();
 
@@ -424,7 +424,7 @@ public static string FormatString(PropertyRoute route)
             return FormatString(route.Type);
         }
 
-        public static string FormatString(Type type)
+        public static string? FormatString(Type type)
         {
             type = type.UnNullify();
             if (type.IsEnum)
@@ -450,11 +450,7 @@ public static string FormatString(Type type)
             }
             return null;
         }
-
-
-
-
-
+        
         public static PropertyInfo PropertyInfo<T>(this T entity, Expression<Func<T, object>> property) where T : ModifiableEntity
         {
             return ReflectionTools.GetPropertyInfo(property);
diff --git a/Signum.Entities/Signum.Entities.csproj b/Signum.Entities/Signum.Entities.csproj
index 429301ed45..715a252080 100644
--- a/Signum.Entities/Signum.Entities.csproj
+++ b/Signum.Entities/Signum.Entities.csproj
@@ -5,7 +5,7 @@
     <LangVersion>8.0</LangVersion>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
     <NullableReferenceTypes>true</NullableReferenceTypes>
-    <!--<TreatWarningsAsErrors>true</TreatWarningsAsErrors>-->
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
diff --git a/Signum.Entities/SystemTime.cs b/Signum.Entities/SystemTime.cs
index 19a749e645..5eb56edf23 100644
--- a/Signum.Entities/SystemTime.cs
+++ b/Signum.Entities/SystemTime.cs
@@ -1,4 +1,4 @@
-using Signum.Utilities;
+using Signum.Utilities;
 using Signum.Utilities.DataStructures;
 using Signum.Utilities.Reflection;
 using System;
@@ -111,7 +111,7 @@ public static Interval<DateTime> SystemPeriod<E, T>(this MListElement<E, T> mlis
 
 
         static MethodInfo miOverlaps = ReflectionTools.GetMethodInfo((Interval<DateTime> pair) => pair.Overlaps(new Interval<DateTime>()));
-        internal static Expression Overlaps(this NewExpression interval1, NewExpression interval2)
+        internal static Expression? Overlaps(this NewExpression interval1, NewExpression interval2)
         {
             if (interval1 == null)
                 return null;
diff --git a/Signum.Entities/ValidationAttributes.cs b/Signum.Entities/ValidationAttributes.cs
index b4c6a94203..8098f0925b 100644
--- a/Signum.Entities/ValidationAttributes.cs
+++ b/Signum.Entities/ValidationAttributes.cs
@@ -18,13 +18,13 @@ namespace Signum.Entities
     [AttributeUsage(AttributeTargets.Property, Inherited = true, AllowMultiple = true)]
     public abstract class ValidatorAttribute : Attribute
     {
-        public Func<ModifiableEntity, bool> IsApplicable;
-        public Func<string> ErrorMessage { get; set; }
+        public Func<ModifiableEntity, bool>? IsApplicable;
+        public Func<string>? ErrorMessage { get; set; }
 
-        public string UnlocalizableErrorMessage
+        public string? UnlocalizableErrorMessage
         {
             get { return ErrorMessage == null ? null : ErrorMessage(); }
-            set { ErrorMessage = () => value; }
+            set { ErrorMessage = () => value!; }
         }
 
         public int Order { get; set; }
@@ -35,7 +35,7 @@ public string UnlocalizableErrorMessage
         //Used for documentation purposes only
         public abstract string HelpMessage { get; }
 
-        public string Error(ModifiableEntity entity, PropertyInfo property, object value)
+        public string? Error(ModifiableEntity entity, PropertyInfo property, object? value)
         {
             if (DisabledInModelBinder && Validator.InModelBinder)
                 return null;
@@ -43,7 +43,7 @@ public string Error(ModifiableEntity entity, PropertyInfo property, object value
             if (IsApplicable != null && !IsApplicable(entity))
                 return null;
 
-            string defaultError = OverrideError(value);
+            string? defaultError = OverrideError(value);
 
             if (defaultError == null)
                 return null;
@@ -61,12 +61,12 @@ public string Error(ModifiableEntity entity, PropertyInfo property, object value
         /// </summary>
         /// <param name="value"></param>
         /// <returns>returns an string with the error message, using {0} if you want the property name to be inserted</returns>
-        protected abstract string OverrideError(object value);
+        protected abstract string? OverrideError(object? value);
     }
 
     public class NotNullValidatorAttribute : ValidatorAttribute
     {
-        protected override string OverrideError(object obj)
+        protected override string? OverrideError(object? obj)
         {
             if (obj == null)
                 return ValidationMessage._0IsNotSet.NiceToString();
@@ -82,8 +82,6 @@ public override string HelpMessage
 
     public class StringLengthValidatorAttribute : ValidatorAttribute
     {
-        public bool AllowNulls { get; set; }
-
         bool? allowLeadingSpaces;
         public bool AllowLeadingSpaces
         {
@@ -114,17 +112,12 @@ public int Max
             set { max = value; }
         }
 
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
-            string val = (string)value;
+            string val = (string)value!;
 
             if (string.IsNullOrEmpty(val))
-            {
-                if (AllowNulls)
-                    return null;
-
-                return ValidationMessage._0IsNotSet.NiceToString();
-            }
+                return null;
 
             if(!MultiLine && (val.Contains('\n') || val.Contains('\r')))
                 return ValidationMessage._0ShouldHaveJustOneLine.NiceToString();
@@ -154,11 +147,8 @@ public override string HelpMessage
                 string result =
                     min != -1 && max != -1 ? ValidationMessage.HaveBetween0And1Characters.NiceToString().FormatWith(min, max) :
                     min != -1 ? ValidationMessage.HaveMinimum0Characters.NiceToString().FormatWith(min) :
-                    max != -1 ? ValidationMessage.HaveMaximum0Characters.NiceToString().FormatWith(max) : null;
-
-                if (AllowNulls)
-                    result = result.Add(" ", ValidationMessage.OrBeNull.NiceToString());
-
+                    max != -1 ? ValidationMessage.HaveMaximum0Characters.NiceToString().FormatWith(max) : ValidationMessage.BeAString.NiceToString();
+                
                 return result;
             }
         }
@@ -188,9 +178,9 @@ public abstract string FormatName
             get;
         }
 
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
-            string str = (string)value;
+            string? str = (string?)value;
             if (string.IsNullOrEmpty(str))
                 return null;
 
@@ -271,7 +261,7 @@ public IdentifierValidatorAttribute(IdentifierType type)
                      type == IdentifierType.PascalAscii ? PascalAscii :
                      type == IdentifierType.Ascii ? Ascii:
                      type == IdentifierType.International ? International :
-                     null
+                     throw new UnexpectedValueException(type)
                      )
         {
             this.type = type;
@@ -362,9 +352,9 @@ public override string HelpMessage
             get { return ValidationMessage.HaveValid0Format.NiceToString().FormatWith(FormatName); }
         }
 
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
-            string str = (string)value;
+            string? str = (string?)value;
 
             if (str == null)
                 return null;
@@ -395,7 +385,7 @@ public DecimalsValidatorAttribute(int decimalPlaces)
             this.DecimalPlaces = decimalPlaces;
         }
 
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
             if (value == null)
                 return null;
@@ -456,7 +446,7 @@ public NumberIsValidatorAttribute(ComparisonType comparison, long number)
             this.number = number;
         }
 
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
             if (value == null)
                 return null;
@@ -527,7 +517,7 @@ public NumberBetweenValidatorAttribute(long min, long max)
             this.max = max;
         }
 
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
             if (value == null)
                 return null;
@@ -555,9 +545,9 @@ public override string HelpMessage
 
     public class NoRepeatValidatorAttribute : ValidatorAttribute
     {
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
-            IList list = (IList)value;
+            IList? list = (IList?)value;
             if (list == null || list.Count <= 1)
                 return null;
             string ex = list.Cast<object>().GroupCount().Where(kvp => kvp.Value > 1).ToString(e => "{0} x {1}".FormatWith(e.Key, e.Value), ", ");
@@ -571,14 +561,14 @@ public override string HelpMessage
             get { return ValidationMessage.HaveNoRepeatedElements.NiceToString(); }
         }
 
-        public static string ByKey<T, K>(IEnumerable<T> collection, Func<T, K> keySelector)
+        public static string? ByKey<T, K>(IEnumerable<T> collection, Func<T, K> keySelector)
         {
             var errors = collection.GroupBy(keySelector)
                 .Select(gr => new { gr.Key, Count = gr.Count() })
                 .Where(a => a.Count > 1)
                 .ToString(e => "{0} x {1}".FormatWith(e.Key, e.Count), ", ");
 
-            return errors.DefaultText(null);
+            return errors.DefaultText(null!);
         }
     }
 
@@ -593,11 +583,11 @@ public CountIsValidatorAttribute(ComparisonType comparison, int number)
             this.number = number;
         }
 
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
-            IList list = (IList)value;
+            IList? list = (IList?)value;
 
-            int val = list == null? 0: list.Count;
+            int val = list == null ? 0 : list.Count;
 
             if ((ComparisonType == ComparisonType.EqualTo && val.CompareTo(number) == 0) ||
                 (ComparisonType == ComparisonType.DistinctTo && val.CompareTo(number) != 0) ||
@@ -658,7 +648,7 @@ public DateTimePrecisionValidatorAttribute(DateTimePrecision precision)
             this.Precision = precision;
         }
 
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
             if (value == null)
                 return null;
@@ -698,7 +688,7 @@ public override string HelpMessage
 
     public class DateInPastValidator : ValidatorAttribute
     {
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
             if (value == null)
                 return null;
@@ -727,7 +717,7 @@ public TimeSpanPrecisionValidatorAttribute(DateTimePrecision precision)
             this.Precision = precision;
         }
 
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
             if (value == null)
                 return null;
@@ -780,12 +770,12 @@ public StringCaseValidatorAttribute(StringCase textCase)
             this.textCase = textCase;
         }
 
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
-            if (string.IsNullOrEmpty((string)value)) return null;
-
-            string str = (string)value;
-
+            string? str = (string?)value;
+            if (string.IsNullOrEmpty(str))
+                return null;
+            
             if ((this.textCase == StringCase.Uppercase) && (str != str.ToUpper()))
                 return ValidationMessage._0HasToBeUppercase.NiceToString();
 
@@ -819,7 +809,7 @@ public IsAssignableToValidatorAttribute(Type type)
             this.Type = type;
         }
 
-        protected override string OverrideError(object value)
+        protected override string? OverrideError(object? value)
         {
             if (value == null)
                 return null;
@@ -882,7 +872,7 @@ public void Add(S state, params bool?[] necessary)
             dictionary.Add(state, necessary);
         }
 
-        public string Validate(E entity, PropertyInfo pi)
+        public string? Validate(E entity, PropertyInfo pi)
         {
             return Validate(entity, pi, true);
         }
@@ -896,9 +886,7 @@ public string Validate(E entity, PropertyInfo pi)
             return Necessary(state, index);
         }
 
-
-
-        public string Validate(E entity, PropertyInfo pi, bool showState)
+        public string? Validate(E entity, PropertyInfo pi, bool showState)
         {
             int index = propertyNames.IndexOf(pi.Name);
             if (index == -1)
@@ -909,14 +897,14 @@ public string Validate(E entity, PropertyInfo pi, bool showState)
             return GetMessage(entity, state, showState, index);
         }
 
-        private string GetMessage(E entity, S state, bool showState, int index)
+        private string? GetMessage(E entity, S state, bool showState, int index)
         {
             bool? necessary = Necessary(state, index);
 
             if (necessary == null)
                 return null;
 
-            object val = getters[index](entity);
+            object? val = getters[index](entity);
             if (val is IList && ((IList)val).Count == 0 || val is string && ((string)val).Length == 0) //both are indistinguible after retrieving
                 val = null;
 
@@ -950,7 +938,7 @@ public IEnumerator GetEnumerator() //just to use object initializer
             throw new NotImplementedException();
         }
 
-        public string PreviewErrors(E entity, S targetState, bool showState)
+        public string? PreviewErrors(E entity, S targetState, bool showState)
         {
             string result = propertyNames.Select((pn, i) => GetMessage(entity, targetState, showState, i)).NotNull().ToString("\r\n");
 
@@ -1095,5 +1083,6 @@ public enum ValidationMessage
         _0IsEmpty,
         [Description("At least one value is needed")]
         _AtLeastOneValueIsNeeded,
+        BeAString,
     }
 }
diff --git a/Signum.Entities/Validator.cs b/Signum.Entities/Validator.cs
index bf7c186611..b4745de5de 100644
--- a/Signum.Entities/Validator.cs
+++ b/Signum.Entities/Validator.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities;
@@ -60,9 +60,9 @@ public static PropertyValidator<T> OverridePropertyValidator<T>(Expression<Func<
 
             var pi = ReflectionTools.GetPropertyInfo(property);
 
-            var dic = validators.GetDefinition(typeof(T));
+            var dic = validators.GetDefinition(typeof(T))!;
 
-            PropertyValidator<T> result = (PropertyValidator<T>)dic?.TryGetC(pi.Name);
+            PropertyValidator<T>? result = (PropertyValidator<T>?)dic?.TryGetC(pi.Name);
 
             if (result == null)
             {
@@ -82,7 +82,7 @@ public static PropertyValidator<T> PropertyValidator<T>(Expression<Func<T, objec
 
             var dic = validators.GetDefinition(typeof(T));
 
-            PropertyValidator<T> result = (PropertyValidator<T>)dic?.TryGetC(pi.Name);
+            PropertyValidator<T>? result = (PropertyValidator<T>?)dic?.TryGetC(pi.Name);
 
             if (result == null)
                 throw new InvalidOperationException("{0} is not defined in {1}, try calling OverridePropertyValidator".FormatWith(pi.PropertyName(), typeof(T).TypeName()));
@@ -90,15 +90,15 @@ public static PropertyValidator<T> PropertyValidator<T>(Expression<Func<T, objec
             return result;
         }
 
-        public static IPropertyValidator TryGetPropertyValidator(PropertyRoute route)
+        public static IPropertyValidator? TryGetPropertyValidator(PropertyRoute route)
         {
             if (route.PropertyRouteType != PropertyRouteType.FieldOrProperty)
                 throw new InvalidOperationException("PropertyRoute of type Property expected");
 
-            return TryGetPropertyValidator(route.Parent.Type, route.PropertyInfo.Name);
+            return TryGetPropertyValidator(route.Parent!.Type, route.PropertyInfo!.Name);
         }
 
-        public static IPropertyValidator TryGetPropertyValidator(Type type, string property)
+        public static IPropertyValidator? TryGetPropertyValidator(Type type, string property)
         {
             GenerateType(type);
 
@@ -137,24 +137,24 @@ public interface IPropertyValidator
         PropertyInfo PropertyInfo { get; }
         List<ValidatorAttribute> Validators { get; }
 
-        string PropertyCheck(ModifiableEntity modifiableEntity);
-        object GetValueUntyped(ModifiableEntity entity);
+        string? PropertyCheck(ModifiableEntity modifiableEntity);
+        object? GetValueUntyped(ModifiableEntity entity);
     }
 
     public class PropertyValidator<T> : IPropertyValidator
         where T : ModifiableEntity
     {
-        public Func<T, object> GetValue { get; private set; }
-        public Action<T, object> SetValue { get; private set; }
+        public Func<T, object?> GetValue { get; private set; }
+        public Action<T, object?> SetValue { get; private set; }
         public PropertyInfo PropertyInfo { get; private set; }
         public List<ValidatorAttribute> Validators { get; private set; }
 
-        public Func<T, bool> IsApplicable { get; set; }
-        public Func<T, bool> IsApplicablePropertyValidation { get; set; }
-        public Func<T, bool> IsApplicableParentChildPropertyValidation { get; set; }
-        public Func<T, bool> IsApplicableStaticPropertyValidation { get; set; }
+        public Func<T, bool>? IsApplicable { get; set; }
+        public Func<T, bool>? IsApplicablePropertyValidation { get; set; }
+        public Func<T, bool>? IsApplicableParentChildPropertyValidation { get; set; }
+        public Func<T, bool>? IsApplicableStaticPropertyValidation { get; set; }
 
-        public Func<T, PropertyInfo, string> StaticPropertyValidation { get; set; }
+        public Func<T, PropertyInfo, string>? StaticPropertyValidation { get; set; }
 
         internal PropertyValidator(PropertyInfo pi)
         {
@@ -162,8 +162,8 @@ internal PropertyValidator(PropertyInfo pi)
 
             this.Validators = pi.GetCustomAttributes(typeof(ValidatorAttribute), false).OfType<ValidatorAttribute>().OrderBy(va => va.Order).ThenBy(va => va.GetType().Name).ToList();
 
-            this.GetValue = ReflectionTools.CreateGetter<T>(pi);
-            this.SetValue = ReflectionTools.CreateSetter<T>(pi);
+            this.GetValue = ReflectionTools.CreateGetter<T>(pi)!;
+            this.SetValue = ReflectionTools.CreateSetter<T>(pi)!;
         }
 
         public void ReplaceValidators(params ValidatorAttribute[] validators)
@@ -172,19 +172,19 @@ public void ReplaceValidators(params ValidatorAttribute[] validators)
             Validators.AddRange(validators);
         }
 
-        public string PropertyCheck(T entity)
+        public string? PropertyCheck(T entity)
         {
             if (IsApplicable != null && !IsApplicable(entity))
                 return null;
 
             if (Validators.Count > 0)
             {
-                object propertyValue = GetValue(entity);
+                object? propertyValue = GetValue(entity);
 
                 //ValidatorAttributes
                 foreach (var validator in Validators)
                 {
-                    string result = validator.Error(entity, PropertyInfo, propertyValue);
+                    string? result = validator.Error(entity, PropertyInfo, propertyValue);
                     if (result != null)
                         return result;
                 }
@@ -193,7 +193,7 @@ public string PropertyCheck(T entity)
             //Internal Validation
             if (IsApplicablePropertyValidation == null || IsApplicablePropertyValidation(entity))
             {
-                string result = entity.PropertyValidation(PropertyInfo);
+                string? result = entity.PropertyValidation(PropertyInfo);
                 if (result != null)
                     return result;
             }
@@ -201,7 +201,7 @@ public string PropertyCheck(T entity)
             //Parent Validation
             if (IsApplicableParentChildPropertyValidation == null || IsApplicableParentChildPropertyValidation(entity))
             {
-                string result = entity.OnParentChildPropertyValidation(PropertyInfo);
+                string? result = entity.OnParentChildPropertyValidation(PropertyInfo);
                 if (result != null)
                     return result;
             }
@@ -234,7 +234,7 @@ public string PropertyCheck(T entity)
             return null;
         }
 
-        public string PropertyCheck(ModifiableEntity modifiableEntity)
+        public string? PropertyCheck(ModifiableEntity modifiableEntity)
         {
             return PropertyCheck((T)modifiableEntity);
         }
@@ -248,7 +248,7 @@ public void IsApplicableValidator<V>(Func<T, bool> isApplicable) where V : Valid
                 validator.IsApplicable = m => isApplicable((T)m);
         }
 
-        public object GetValueUntyped(ModifiableEntity entity)
+        public object? GetValueUntyped(ModifiableEntity entity)
         {
             return GetValue((T)entity);
         }

From 2c97532a4d2ebbf6fa42c01af7ca5cdd23c5e4f0 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Tue, 15 Jan 2019 08:14:59 +0100
Subject: [PATCH 08/25] not nullable (QueryBinder!)

---
 Signum.Engine/Administrator.cs                |  83 ++--
 Signum.Engine/Basics/TypeLogic.cs             |  18 +-
 Signum.Engine/BulkInserter.cs                 |  27 +-
 Signum.Engine/Connection/Connector.cs         |  16 +-
 Signum.Engine/Connection/Executor.cs          |  16 +-
 Signum.Engine/Connection/SqlConnector.cs      |  39 +-
 Signum.Engine/Database.cs                     |  67 ++-
 .../DynamicQuery/ColumnDescriptionFactory.cs  |  40 +-
 .../DynamicQuery/ExpressionContainer.cs       |  83 ++--
 Signum.Engine/Engine/ProgressExtensions.cs    |  28 +-
 Signum.Engine/Engine/SchemaSynchronizer.cs    |  91 ++--
 Signum.Engine/Engine/SqlBuilder.cs            |  59 ++-
 Signum.Engine/Engine/SqlPreCommand.cs         |  34 +-
 Signum.Engine/Engine/Synchronizer.cs          |  70 +--
 Signum.Engine/Linq/DbExpressions.Signum.cs    |  43 +-
 Signum.Engine/Linq/DbExpressions.Sql.cs       |  65 ++-
 Signum.Engine/Linq/DbQueryProvider.cs         |  20 +-
 .../ChildProjectionFlattener.cs               |   8 +-
 .../ExpressionVisitor/DbExpressionComparer.cs |  10 +-
 .../DbExpressionNominator.cs                  | 124 ++---
 .../OverloadingSimplifier.cs                  |   6 +-
 .../Linq/ExpressionVisitor/QueryBinder.cs     | 437 ++++++++++--------
 .../Linq/ExpressionVisitor/QueryFilterer.cs   |   4 +-
 Signum.Engine/Patterns/VirtualMList.cs        |  28 +-
 Signum.Engine/Schema/EntityEvents.cs          |  69 +--
 Signum.Engine/Schema/FluentInclude.cs         |  18 +-
 Signum.Engine/Schema/ObjectName.cs            |  24 +-
 Signum.Engine/Schema/Schema.Basics.cs         | 222 +++++----
 Signum.Engine/Schema/Schema.Delete.cs         |   2 +-
 Signum.Engine/Schema/Schema.Save.cs           | 202 ++++----
 Signum.Engine/Schema/Schema.cs                | 167 +++----
 .../Schema/SchemaBuilder/SchemaBuilder.cs     | 191 ++++----
 .../SchemaBuilder/SchemaBuilderSettings.cs    |   2 +-
 Signum.Engine/Signum.Engine.csproj            |   4 +-
 Signum.Entities/Basics/Type.cs                |  10 +-
 .../Tokens/ExtensionDictionaryToken.cs        |  15 +-
 .../DynamicQuery/Tokens/ExtensionToken.cs     |   6 +-
 Signum.Entities/SystemTime.cs                 |   6 +-
 .../DataStructures/ImmutableStack.cs          |   2 +-
 Signum.Utilities/Disposable.cs                |   4 +-
 .../ExpressionTrees/ExpressionCleaner.cs      |  32 +-
 .../Extensions/DateTimeExtensions.cs          |   6 +-
 .../Extensions/EnumerableExtensions.cs        |   8 +-
 .../Extensions/StreamExtensions.cs            |   4 +-
 Signum.Utilities/Profiler/HeavyProfiler.cs    |  12 +-
 .../Synchronization/CultureInfoUtils.cs       |  14 +-
 46 files changed, 1277 insertions(+), 1159 deletions(-)

diff --git a/Signum.Engine/Administrator.cs b/Signum.Engine/Administrator.cs
index c4c5e578bd..19cce5b203 100644
--- a/Signum.Engine/Administrator.cs
+++ b/Signum.Engine/Administrator.cs
@@ -1,4 +1,4 @@
-using Signum.Engine.Linq;
+using Signum.Engine.Linq;
 using Signum.Engine.Maps;
 using Signum.Engine.SchemaInfoTables;
 using Signum.Entities;
@@ -21,7 +21,7 @@ public static void TotalGeneration()
             foreach (var db in Schema.Current.DatabaseNames())
                 Connector.Current.CleanDatabase(db);
 
-            SqlPreCommandConcat totalScript = (SqlPreCommandConcat)Schema.Current.GenerationScipt();
+            SqlPreCommandConcat totalScript = (SqlPreCommandConcat)Schema.Current.GenerationScipt()!;
             foreach (SqlPreCommand command in totalScript.Commands)
             {
                 command.ExecuteLeaves();
@@ -72,12 +72,12 @@ private static string GenerateColumnCode(DiffColumn c)
             return sb.ToString();
         }
 
-        public static SqlPreCommand TotalGenerationScript()
+        public static SqlPreCommand? TotalGenerationScript()
         {
             return Schema.Current.GenerationScipt();
         }
 
-        public static SqlPreCommand TotalSynchronizeScript(bool interactive = true, bool schemaOnly = false)
+        public static SqlPreCommand? TotalSynchronizeScript(bool interactive = true, bool schemaOnly = false)
         {
             var command = Schema.Current.SynchronizationScript(interactive, schemaOnly);
 
@@ -120,8 +120,8 @@ public static void CreateTemporaryIndex<T>(Expression<Func<T, object>> fields, b
             SqlBuilder.CreateIndex(index, checkUnique: null).ExecuteLeaves();
         }
 
-        internal static readonly ThreadVariable<DatabaseName> sysViewDatabase = Statics.ThreadVariable<DatabaseName>("viewDatabase");
-        public static IDisposable OverrideDatabaseInSysViews(DatabaseName database)
+        internal static readonly ThreadVariable<DatabaseName?> sysViewDatabase = Statics.ThreadVariable<DatabaseName?>("viewDatabase");
+        public static IDisposable OverrideDatabaseInSysViews(DatabaseName? database)
         {
             var old = sysViewDatabase.Value;
             sysViewDatabase.Value = database;
@@ -143,10 +143,10 @@ public static bool ExistsTable(ITable table)
         {
             SchemaName schema = table.Name.Schema;
 
-            if (schema.Database != null && schema.Database.Server != null && !Database.View<SysServers>().Any(ss => ss.name == schema.Database.Server.Name))
+            if (schema.Database != null && schema.Database.Server != null && !Database.View<SysServers>().Any(ss => ss.name == schema.Database!.Server!.Name))
                 return false;
 
-            if (schema.Database != null && !Database.View<SysDatabases>().Any(ss => ss.name == schema.Database.Name))
+            if (schema.Database != null && !Database.View<SysDatabases>().Any(ss => ss.name == schema.Database!.Name))
                 return false;
 
             using (schema.Database == null ? null : Administrator.OverrideDatabaseInSysViews(schema.Database))
@@ -244,7 +244,7 @@ public static void SaveListDisableIdentity<T>(IEnumerable<T> entities)
             }
         }
 
-        public static int UnsafeDeleteDuplicates<E, K>(this IQueryable<E> query, Expression<Func<E, K>> key, string message = null)
+        public static int UnsafeDeleteDuplicates<E, K>(this IQueryable<E> query, Expression<Func<E, K>> key, string? message = null)
            where E : Entity
         {
             return (from e in query
@@ -252,7 +252,7 @@ public static int UnsafeDeleteDuplicates<E, K>(this IQueryable<E> query, Express
                     select e).UnsafeDelete(message);
         }
 
-        public static int UnsafeDeleteMListDuplicates<E, V, K>(this IQueryable<MListElement<E,V>> query, Expression<Func<MListElement<E, V>, K>> key, string message = null)
+        public static int UnsafeDeleteMListDuplicates<E, V, K>(this IQueryable<MListElement<E,V>> query, Expression<Func<MListElement<E, V>, K>> key, string? message = null)
             where E : Entity
         {
             return (from e in query
@@ -267,7 +267,7 @@ public static SqlPreCommandSimple QueryPreCommand<T>(IQueryable<T> query)
             return prov.Translate(query.Expression, tr => tr.MainCommand);
         }
 
-        public static SqlPreCommandSimple UnsafeDeletePreCommand<T>(IQueryable<T> query)
+        public static SqlPreCommandSimple? UnsafeDeletePreCommand<T>(IQueryable<T> query)
             where T : Entity
         {
             if (!Administrator.ExistsTable<T>() || !query.Any())
@@ -278,7 +278,7 @@ public static SqlPreCommandSimple UnsafeDeletePreCommand<T>(IQueryable<T> query)
                 return prov.Delete<SqlPreCommandSimple>(query, cm => cm, removeSelectRowCount: true);
         }
 
-        public static SqlPreCommandSimple UnsafeDeletePreCommandMList<E, V>(Expression<Func<E, MList<V>>> mListProperty, IQueryable<MListElement<E, V>> query)
+        public static SqlPreCommandSimple? UnsafeDeletePreCommandMList<E, V>(Expression<Func<E, MList<V>>> mListProperty, IQueryable<MListElement<E, V>> query)
             where E : Entity
         {
             if (!Administrator.ExistsTable(Schema.Current.TableMList(mListProperty)) || !query.Any())
@@ -322,12 +322,12 @@ public static SqlPreCommandSimple UnsafeUpdatePartPreCommand(IUpdateable update)
             });
         }
 
-        public static void UpdateToStrings<T>(Expression<Func<T, string>> expression) where T : Entity, new()
+        public static void UpdateToStrings<T>(Expression<Func<T, string?>> expression) where T : Entity, new()
         {
             UpdateToStrings(Database.Query<T>(), expression);
         }
 
-        public static void UpdateToStrings<T>(IQueryable<T> query, Expression<Func<T, string>> expression) where T : Entity, new()
+        public static void UpdateToStrings<T>(IQueryable<T> query, Expression<Func<T, string?>> expression) where T : Entity, new()
         {
             SafeConsole.WaitRows("UnsafeUpdate toStr for {0}".FormatWith(typeof(T).TypeName()), () =>
                 query.UnsafeUpdate().Set(a => a.toStr, expression).Execute());
@@ -340,7 +340,7 @@ public static SqlPreCommandSimple UnsafeUpdatePartPreCommand(IUpdateable update)
                 .Execute();
         }
 
-        public static void UpdateToString<T>(T entity, Expression<Func<T, string>> expression) where T : Entity, new()
+        public static void UpdateToString<T>(T entity, Expression<Func<T, string?>> expression) where T : Entity, new()
         {
             entity.InDB().UnsafeUpdate()
                 .Set(e => e.toStr, expression)
@@ -393,13 +393,13 @@ public static IDisposable PrepareTableForBatchLoadScope(ITable table, bool disab
                 if (multiIndexes.Any())
                 {
                     SafeConsole.WriteColor(ConsoleColor.DarkMagenta, " DISABLE Multiple Indexes");
-                    multiIndexes.Select(i => SqlBuilder.DisableIndex(table.Name, i)).Combine(Spacing.Simple).ExecuteLeaves();
+                    multiIndexes.Select(i => SqlBuilder.DisableIndex(table.Name, i)).Combine(Spacing.Simple)!.ExecuteLeaves();
                     Executor.ExecuteNonQuery(multiIndexes.ToString(i => "ALTER INDEX [{0}] ON {1} DISABLE".FormatWith(i, table.Name), "\r\n"));
 
                     onDispose += () =>
                     {
                         SafeConsole.WriteColor(ConsoleColor.DarkMagenta, " REBUILD Multiple Indexes");
-                        multiIndexes.Select(i => SqlBuilder.RebuildIndex(table.Name, i)).Combine(Spacing.Simple).ExecuteLeaves();
+                        multiIndexes.Select(i => SqlBuilder.RebuildIndex(table.Name, i)).Combine(Spacing.Simple)!.ExecuteLeaves();
                     };
                 }
             }
@@ -411,11 +411,11 @@ public static IDisposable PrepareTableForBatchLoadScope(ITable table, bool disab
                 if (uniqueIndexes.Any())
                 {
                     SafeConsole.WriteColor(ConsoleColor.DarkMagenta, " DISABLE Unique Indexes");
-                    uniqueIndexes.Select(i => SqlBuilder.DisableIndex(table.Name, i)).Combine(Spacing.Simple).ExecuteLeaves();
+                    uniqueIndexes.Select(i => SqlBuilder.DisableIndex(table.Name, i)).Combine(Spacing.Simple)!.ExecuteLeaves();
                     onDispose += () =>
                     {
                         SafeConsole.WriteColor(ConsoleColor.DarkMagenta, " REBUILD Unique Indexes");
-                        uniqueIndexes.Select(i => SqlBuilder.RebuildIndex(table.Name, i)).Combine(Spacing.Simple).ExecuteLeaves();
+                        uniqueIndexes.Select(i => SqlBuilder.RebuildIndex(table.Name, i)).Combine(Spacing.Simple)!.ExecuteLeaves();
                     };
                 }
             }
@@ -452,11 +452,11 @@ from ifk in targetTable.IncommingForeignKeys()
                  ParentColumn = parentTable.Columns().SingleEx(c => c.column_id == ifk.ForeignKeyColumns().SingleEx().parent_column_id).name,
              }).ToList());
 
-            foreignKeys.ForEach(fk => SqlBuilder.AlterTableDropConstraint(fk.ParentTable, fk.Name).ExecuteLeaves());
+            foreignKeys.ForEach(fk => SqlBuilder.AlterTableDropConstraint(fk.ParentTable!, fk.Name! /*CSBUG*/).ExecuteLeaves());
 
             return new Disposable(() =>
             {
-                foreignKeys.ToList().ForEach(fk => SqlBuilder.AlterTableAddConstraintForeignKey(fk.ParentTable, fk.ParentColumn, table.Name, table.PrimaryKey.Name).ExecuteLeaves());
+                foreignKeys.ToList().ForEach(fk => SqlBuilder.AlterTableAddConstraintForeignKey(fk.ParentTable!, fk.ParentColumn!, table.Name, table.PrimaryKey.Name)!.ExecuteLeaves());
             });
         }
 
@@ -491,27 +491,27 @@ public static void DropUniqueIndexes<T>() where T : Entity
             var indexesNames = Administrator.GetIndixesNames(table, unique: true);
 
             if (indexesNames.HasItems())
-                indexesNames.Select(n => SqlBuilder.DropIndex(table.Name, n)).Combine(Spacing.Simple).ExecuteLeaves();
+                indexesNames.Select(n => SqlBuilder.DropIndex(table.Name, n)).Combine(Spacing.Simple)!.ExecuteLeaves();
         }
 
 
-        public static void MoveAllForeignKeys<T>(Lite<T> fromEntity, Lite<T> toEntity, Func<ITable, IColumn, bool> shouldMove = null)
+        public static void MoveAllForeignKeys<T>(Lite<T> fromEntity, Lite<T> toEntity, Func<ITable, IColumn, bool>? shouldMove = null)
         where T : Entity
         {
             using (Transaction tr = new Transaction())
             {
-                MoveAllForeignKeysPrivate<T>(fromEntity, toEntity, shouldMove).Select(a => a.UpdateScript).Combine(Spacing.Double).ExecuteLeaves();
+                MoveAllForeignKeysPrivate<T>(fromEntity, toEntity, shouldMove).Select(a => a.UpdateScript).Combine(Spacing.Double)!.ExecuteLeaves();
                 tr.Commit();
             }
         }
 
-        public static SqlPreCommand MoveAllForeignKeysScript<T>(Lite<T> fromEntity, Lite<T> toEntity, Func<ITable, IColumn, bool> shouldMove = null)
+        public static SqlPreCommand? MoveAllForeignKeysScript<T>(Lite<T> fromEntity, Lite<T> toEntity, Func<ITable, IColumn, bool>? shouldMove = null)
         where T : Entity
         {
             return MoveAllForeignKeysPrivate<T>(fromEntity, toEntity, shouldMove).Select(a => a.UpdateScript).Combine(Spacing.Double);
         }
 
-        public static void MoveAllForeignKeysConsole<T>(Lite<T> fromEntity, Lite<T> toEntity, Func<ITable, IColumn, bool> shouldMove = null)
+        public static void MoveAllForeignKeysConsole<T>(Lite<T> fromEntity, Lite<T> toEntity, Func<ITable, IColumn, bool>? shouldMove = null)
             where T : Entity
         {
             var tuples = MoveAllForeignKeysPrivate<T>(fromEntity, toEntity, shouldMove);
@@ -525,9 +525,15 @@ class ColumnTableScript
         {
             public ColumnTable ColumnTable;
             public SqlPreCommandSimple UpdateScript;
+
+            public ColumnTableScript(ColumnTable columnTable, SqlPreCommandSimple updateScript)
+            {
+                ColumnTable = columnTable;
+                UpdateScript = updateScript;
+            }
         }
 
-        static List<ColumnTableScript> MoveAllForeignKeysPrivate<T>(Lite<T> fromEntity, Lite<T> toEntity, Func<ITable, IColumn, bool> shouldMove)
+        static List<ColumnTableScript> MoveAllForeignKeysPrivate<T>(Lite<T> fromEntity, Lite<T> toEntity, Func<ITable, IColumn, bool>? shouldMove)
         where T : Entity
         {
             if (fromEntity.GetType() != toEntity.GetType())
@@ -542,24 +548,26 @@ static List<ColumnTableScript> MoveAllForeignKeysPrivate<T>(Lite<T> fromEntity,
 
             List<ColumnTable> columns = GetColumnTables(s, refTable);
             if (shouldMove != null)
-                columns = columns.Where(p => shouldMove(p.Table, p.Column)).ToList();
+                columns = columns.Where(p => shouldMove!(p.Table, p.Column)).ToList();
 
             var pb = Connector.Current.ParameterBuilder;
-            return columns.Select(ct => new ColumnTableScript
-            {
-                ColumnTable = ct,
-                UpdateScript = new SqlPreCommandSimple("UPDATE {0}\r\nSET {1} = @toEntity\r\nWHERE {1} = @fromEntity".FormatWith(ct.Table.Name, ct.Column.Name.SqlEscape()), new List<DbParameter>
+            return columns.Select(ct => new ColumnTableScript(ct, new SqlPreCommandSimple("UPDATE {0}\r\nSET {1} = @toEntity\r\nWHERE {1} = @fromEntity".FormatWith(ct.Table.Name, ct.Column.Name.SqlEscape()), new List<DbParameter>
                 {
                     pb.CreateReferenceParameter("@fromEntity", fromEntity.Id, ct.Column),
                     pb.CreateReferenceParameter("@toEntity", toEntity.Id, ct.Column),
-                })
-            }).ToList();
+                }))).ToList();
         }
 
         class ColumnTable
         {
             public ITable Table;
             public IColumn Column;
+
+            public ColumnTable(ITable table, IColumn column)
+            {
+                Table = table;
+                Column = column;
+            }
         }
 
         static ConcurrentDictionary<Table, List<ColumnTable>> columns = new ConcurrentDictionary<Table, List<ColumnTable>>();
@@ -571,11 +579,8 @@ static List<ColumnTable> GetColumnTables(Schema schema, Table refTable)
                 return (from t in schema.GetDatabaseTables()
                         from c in t.Columns.Values
                         where c.ReferenceTable == rt
-                        select new ColumnTable
-                        {
-                            Table = t,
-                            Column = c,
-                        }).ToList();
+                        select new ColumnTable(t,c))
+                        .ToList();
             });
         }
 
diff --git a/Signum.Engine/Basics/TypeLogic.cs b/Signum.Engine/Basics/TypeLogic.cs
index 86e18d4737..7a90ad2bcc 100644
--- a/Signum.Engine/Basics/TypeLogic.cs
+++ b/Signum.Engine/Basics/TypeLogic.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Entities;
@@ -37,7 +37,7 @@ public static Dictionary<TypeEntity, Type> EntityToType
 
         public static void AssertStarted(SchemaBuilder sb)
         {
-            sb.AssertDefined(ReflectionTools.GetMethodInfo(() => Start(null)));
+            sb.AssertDefined(ReflectionTools.GetMethodInfo(() => Start(null!)));
         }
 
         public static void Start(SchemaBuilder sb)
@@ -86,10 +86,10 @@ public static Dictionary<TypeEntity, Type> TryEntityToType(Replacements replacem
         {
             return (from dn in Administrator.TryRetrieveAll<TypeEntity>(replacements)
                     join t in Schema.Current.Tables.Keys on dn.FullClassName equals (EnumEntity.Extract(t) ?? t).FullName
-                    select new { dn, t }).ToDictionary(a => a.dn, a => a.t);
+                    select (dn, t)).ToDictionary(a => a.dn, a => a.t);
         }
 
-        public static SqlPreCommand Schema_Synchronizing(Replacements replacements)
+        public static SqlPreCommand? Schema_Synchronizing(Replacements replacements)
         {
             var schema = Schema.Current;
 
@@ -159,7 +159,7 @@ static bool EqualsIgnoringDatabasePrefix(ObjectName pc, ObjectName ps) =>
             pc.Schema.Name  == ps.Schema.Name &&
             Suffix(pc.Schema.Database?.Name) == Suffix(ps.Schema.Database?.Name);
 
-        static string Suffix(string name) => name.TryAfterLast("_") ?? name;
+        static string? Suffix(string? name) => name.TryAfterLast("_") ?? name;
 
         static Dictionary<string, O> ApplyReplacementsToOld<O>(this Replacements replacements, Dictionary<string, O> oldDictionary, string replacementsKey)
         {
@@ -177,7 +177,7 @@ internal static SqlPreCommand Schema_Generating()
 
             return GenerateSchemaTypes()
                 .Select((e, i) => table.InsertSqlSync(e, suffix: i.ToString()))
-                .Combine(Spacing.Simple)
+                .Combine(Spacing.Simple)!
                 .PlainSqlCommand();
         }
 
@@ -210,7 +210,7 @@ public static Type GetType(string cleanName)
             return NameToType.GetOrThrow(cleanName, "Type {0} not found in the schema");
         }
 
-        public static Type TryGetType(string cleanName)
+        public static Type? TryGetType(string cleanName)
         {
             return NameToType.TryGetC(cleanName);
         }
@@ -220,7 +220,7 @@ public static string GetCleanName(Type type)
             return TypeToName.GetOrThrow(type, "Type {0} not found in the schema");
         }
 
-        public static string TryGetCleanName(Type type)
+        public static string? TryGetCleanName(Type type)
         {
             return TypeToName.TryGetC(type);
         }
@@ -240,7 +240,7 @@ public TypeCaches(Schema current)
                     current.Tables.Keys,
                     t => t.FullClassName,
                     t => (EnumEntity.Extract(t) ?? t).FullName,
-                    (typeEntity, type) => new { typeEntity, type },
+                    (typeEntity, type) => (typeEntity, type),
                      "caching {0}".FormatWith(current.Table(typeof(TypeEntity)).Name)
                     ).ToDictionary(a => a.type, a => a.typeEntity);
 
diff --git a/Signum.Engine/BulkInserter.cs b/Signum.Engine/BulkInserter.cs
index f562063cdd..493552bc2d 100644
--- a/Signum.Engine/BulkInserter.cs
+++ b/Signum.Engine/BulkInserter.cs
@@ -1,4 +1,4 @@
-using Signum.Engine.Maps;
+using Signum.Engine.Maps;
 using Signum.Entities;
 using Signum.Entities.Reflection;
 using Signum.Utilities;
@@ -22,7 +22,7 @@ public static int BulkInsert<T>(this IEnumerable<T> entities,
             bool validateFirst = true,
             bool disableIdentity = false,
             int? timeout = null,
-            string message = null)
+            string? message = null)
             where T : Entity
         {
             using (HeavyProfiler.Log(nameof(BulkInsert), () => typeof(T).TypeName()))
@@ -52,13 +52,14 @@ public static int BulkInsert<T>(this IEnumerable<T> entities,
         /// <param name="isNewPredicate">Optional filter to query only the recently inseted entities</param>
         public static int BulkInsertQueryIds<T, K>(this IEnumerable<T> entities,
             Expression<Func<T, K>> keySelector,
-            Expression<Func<T, bool>> isNewPredicate = null,
+            Expression<Func<T, bool>>? isNewPredicate = null,
             SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
             bool preSaving = true,
             bool validateFirst = true,
             int? timeout = null,
-            string message = null)
-            where T : Entity
+            string? message = null)
+            where T : Entity
+            where K : object
         {
             using (HeavyProfiler.Log(nameof(BulkInsertQueryIds), () => typeof(T).TypeName()))
             using (Transaction tr = new Transaction())
@@ -90,7 +91,7 @@ public static int BulkInsertQueryIds<T, K>(this IEnumerable<T> entities,
             }
         }
 
-        static void BulkInsertMLists<T>(List<T> list, SqlBulkCopyOptions options, int? timeout, string message) where T : Entity
+        static void BulkInsertMLists<T>(List<T> list, SqlBulkCopyOptions options, int? timeout, string? message) where T : Entity
         {
             var mlistPrs = PropertyRoute.GenerateRoutes(typeof(T), includeIgnored: false).Where(a => a.PropertyRouteType == PropertyRouteType.FieldOrProperty && a.Type.IsMList()).ToList();
             foreach (var pr in mlistPrs)
@@ -124,7 +125,7 @@ public static int BulkInsertTable<T>(IEnumerable<T> entities,
             bool validateFirst = true,
             bool disableIdentity = false,
             int? timeout = null,
-            string message = null)
+            string? message = null)
             where T : Entity
         {
             using (HeavyProfiler.Log(nameof(BulkInsertTable), () => typeof(T).TypeName()))
@@ -201,11 +202,11 @@ static void Validate<T>(IEnumerable<T> entities) where T : Entity
             }
         }
 
-        static GenericInvoker<Func<IList, PropertyRoute, SqlBulkCopyOptions, int?, string, int>> giBulkInsertMListFromEntities =
-            new GenericInvoker<Func<IList, PropertyRoute, SqlBulkCopyOptions, int?, string, int>>((entities, propertyRoute, options, timeout, message) =>
+        static GenericInvoker<Func<IList, PropertyRoute, SqlBulkCopyOptions, int?, string?, int>> giBulkInsertMListFromEntities =
+            new GenericInvoker<Func<IList, PropertyRoute, SqlBulkCopyOptions, int?, string?, int>>((entities, propertyRoute, options, timeout, message) =>
             BulkInsertMListTablePropertyRoute<Entity, string>((List<Entity>)entities, propertyRoute, options, timeout, message));
 
-        static int BulkInsertMListTablePropertyRoute<E, V>(List<E> entities, PropertyRoute route, SqlBulkCopyOptions copyOptions, int? timeout, string message)
+        static int BulkInsertMListTablePropertyRoute<E, V>(List<E> entities, PropertyRoute route, SqlBulkCopyOptions copyOptions, int? timeout, string? message)
              where E : Entity
         {
             return BulkInsertMListTable<E, V>(entities, route.GetLambdaExpression<E, MList<V>>(safeNullAccess: false), copyOptions, timeout, message);
@@ -216,7 +217,7 @@ public static int BulkInsertMListTable<E, V>(
             Expression<Func<E, MList<V>>> mListProperty,
             SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
             int? timeout = null,
-            string message = null)
+            string? message = null)
             where E : Entity
         {
             using (HeavyProfiler.Log(nameof(BulkInsertMListTable), () => $"{mListProperty} ({typeof(E).TypeName()})"))
@@ -251,7 +252,7 @@ public static int BulkInsertMListTable<E, V>(
             SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
             int? timeout = null,
             bool? updateParentTicks = null, /*Needed for concurrency and Temporal tables*/
-            string message = null)
+            string? message = null)
             where E : Entity
         {
             using (HeavyProfiler.Log(nameof(BulkInsertMListTable), () => $"{mListProperty} ({typeof(MListElement<E, V>).TypeName()})"))
@@ -310,7 +311,7 @@ public static int BulkInsertMListTable<E, V>(
         public static int BulkInsertView<T>(this IEnumerable<T> entities,
           SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
           int? timeout = null,
-          string message = null)
+          string? message = null)
           where T : IView
         {
             using (HeavyProfiler.Log(nameof(BulkInsertView), () => typeof(T).Name))
diff --git a/Signum.Engine/Connection/Connector.cs b/Signum.Engine/Connection/Connector.cs
index d4fa504391..3c3a2dcdfe 100644
--- a/Signum.Engine/Connection/Connector.cs
+++ b/Signum.Engine/Connection/Connector.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Data;
 using Signum.Utilities;
 using Signum.Engine.Maps;
@@ -82,7 +82,7 @@ protected static void Log(SqlPreCommandSimple pcs)
 
         public abstract SqlDbType GetSqlDbType(DbParameter p);
 
-        protected internal abstract object ExecuteScalar(SqlPreCommandSimple preCommand, CommandType commandType);
+        protected internal abstract object? ExecuteScalar(SqlPreCommandSimple preCommand, CommandType commandType);
         protected internal abstract int ExecuteNonQuery(SqlPreCommandSimple preCommand, CommandType commandType);
         protected internal abstract DataTable ExecuteDataTable(SqlPreCommandSimple command, CommandType commandType);
         protected internal abstract DbDataReaderWithCommand UnsafeExecuteDataReader(SqlPreCommandSimple sqlPreCommandSimple, CommandType commandType);
@@ -108,7 +108,7 @@ protected static void Log(SqlPreCommandSimple pcs)
 
         public abstract ParameterBuilder ParameterBuilder { get; protected set; }
 
-        public abstract void CleanDatabase(DatabaseName database);
+        public abstract void CleanDatabase(DatabaseName? database);
 
         public abstract bool AllowsMultipleQueries { get; }
 
@@ -116,11 +116,11 @@ protected static void Log(SqlPreCommandSimple pcs)
         public abstract bool SupportsScalarSubqueryInAggregates { get; }
 
 
-        public static string TryExtractDatabaseNameWithPostfix(ref string connectionString, string catalogPostfix)
+        public static string? TryExtractDatabaseNameWithPostfix(ref string connectionString, string catalogPostfix)
         {
             string toFind = "+" + catalogPostfix;
 
-            string result = connectionString.TryBefore(toFind).TryAfterLast("=");
+            string? result = connectionString.TryBefore(toFind).TryAfterLast("=");
             if (result == null)
                 return null;
 
@@ -168,7 +168,7 @@ public static string GetParameterName(string name)
 
         public DbParameter CreateReferenceParameter(string parameterName, PrimaryKey? id, IColumn column)
         {
-            return CreateParameter(parameterName, column.SqlDbType, null, column.Nullable.ToBool(), id == null ? (object)null : id.Value.Object);
+            return CreateParameter(parameterName, column.SqlDbType, null, column.Nullable.ToBool(), id == null ? null : id.Value.Object);
         }
 
         public DbParameter CreateParameter(string parameterName, object value, Type type)
@@ -178,8 +178,8 @@ public DbParameter CreateParameter(string parameterName, object value, Type type
             return CreateParameter(parameterName, pair.SqlDbType, pair.UserDefinedTypeName, type == null || type.IsByRef || type.IsNullable(), value);
         }
 
-        public abstract DbParameter CreateParameter(string parameterName, SqlDbType type, string udtTypeName, bool nullable, object value);
-        public abstract MemberInitExpression ParameterFactory(Expression parameterName, SqlDbType type, string udtTypeName, bool nullable, Expression value);
+        public abstract DbParameter CreateParameter(string parameterName, SqlDbType type, string? udtTypeName, bool nullable, object? value);
+        public abstract MemberInitExpression ParameterFactory(Expression parameterName, SqlDbType type, string? udtTypeName, bool nullable, Expression value);
 
         protected static bool IsDate(SqlDbType type)
         {
diff --git a/Signum.Engine/Connection/Executor.cs b/Signum.Engine/Connection/Executor.cs
index 6f6ec21f2d..a15d55a3b9 100644
--- a/Signum.Engine/Connection/Executor.cs
+++ b/Signum.Engine/Connection/Executor.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Data;
 using System.Data.Common;
 using System.Data.SqlClient;
@@ -10,7 +10,7 @@ namespace Signum.Engine
 {
     public static class Executor
     {
-        public static object ExecuteScalar(string sql, List<DbParameter> parameters = null, CommandType commandType = CommandType.Text)
+        public static object ExecuteScalar(string sql, List<DbParameter>? parameters = null, CommandType commandType = CommandType.Text)
         {
             return Connector.Current.ExecuteScalar(new SqlPreCommandSimple(sql, parameters), commandType);
         }
@@ -21,7 +21,7 @@ public static object ExecuteScalar(this SqlPreCommandSimple preCommand, CommandT
         }
 
 
-        public static int ExecuteNonQuery(string sql, List<DbParameter> parameters = null, CommandType commandType = CommandType.Text)
+        public static int ExecuteNonQuery(string sql, List<DbParameter>? parameters = null, CommandType commandType = CommandType.Text)
         {
             return Connector.Current.ExecuteNonQuery(new SqlPreCommandSimple(sql, parameters), commandType);
         }
@@ -32,7 +32,7 @@ public static int ExecuteNonQuery(this SqlPreCommandSimple preCommand, CommandTy
         }
 
 
-        public static DbDataReaderWithCommand UnsafeExecuteDataReader(string sql, List<DbParameter> parameters = null, CommandType commandType = CommandType.Text)
+        public static DbDataReaderWithCommand UnsafeExecuteDataReader(string sql, List<DbParameter>? parameters = null, CommandType commandType = CommandType.Text)
         {
             return Connector.Current.UnsafeExecuteDataReader(new SqlPreCommandSimple(sql, parameters), commandType);
         }
@@ -42,7 +42,7 @@ public static DbDataReaderWithCommand UnsafeExecuteDataReader(this SqlPreCommand
             return Connector.Current.UnsafeExecuteDataReader(preCommand, commandType);
         }
 
-        public static Task<DbDataReaderWithCommand> UnsafeExecuteDataReaderAsync(string sql, List<DbParameter> parameters = null, CommandType commandType = CommandType.Text, CancellationToken token = default(CancellationToken))
+        public static Task<DbDataReaderWithCommand> UnsafeExecuteDataReaderAsync(string sql, List<DbParameter>? parameters = null, CommandType commandType = CommandType.Text, CancellationToken token = default(CancellationToken))
         {
             return Connector.Current.UnsafeExecuteDataReaderAsync(new SqlPreCommandSimple(sql, parameters), commandType, token);
         }
@@ -52,7 +52,7 @@ public static DbDataReaderWithCommand UnsafeExecuteDataReader(this SqlPreCommand
             return Connector.Current.UnsafeExecuteDataReaderAsync(preCommand, commandType, token);
         }
 
-        public static DataTable ExecuteDataTable(string sql, List<DbParameter> parameters = null, CommandType commandType = CommandType.Text)
+        public static DataTable ExecuteDataTable(string sql, List<DbParameter>? parameters = null, CommandType commandType = CommandType.Text)
         {
             return Connector.Current.ExecuteDataTable(new SqlPreCommandSimple(sql, parameters), commandType);
         }
@@ -63,7 +63,7 @@ public static DataTable ExecuteDataTable(this SqlPreCommandSimple preCommand, Co
         }
 
 
-        public static DataSet ExecuteDataSet(string sql, List<DbParameter> parameters = null, CommandType commandType = CommandType.Text)
+        public static DataSet ExecuteDataSet(string sql, List<DbParameter>? parameters = null, CommandType commandType = CommandType.Text)
         {
             return Connector.Current.ExecuteDataSet(new SqlPreCommandSimple(sql, parameters), commandType);
         }
@@ -86,4 +86,4 @@ public static void BulkCopy(DataTable dt, ObjectName destinationTable, SqlBulkCo
             Connector.Current.BulkCopy(dt, destinationTable, options, timeout);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Engine/Connection/SqlConnector.cs b/Signum.Engine/Connection/SqlConnector.cs
index bc607c865e..e8293c8003 100644
--- a/Signum.Engine/Connection/SqlConnector.cs
+++ b/Signum.Engine/Connection/SqlConnector.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Data.SqlClient;
@@ -112,7 +112,7 @@ public string ConnectionString
         public override bool SupportsScalarSubquery { get { return true; } }
         public override bool SupportsScalarSubqueryInAggregates { get { return false; } }
 
-        SqlConnection EnsureConnection()
+        SqlConnection? EnsureConnection()
         {
             if (Transaction.HasTransaction)
                 return null;
@@ -122,7 +122,7 @@ SqlConnection EnsureConnection()
             return result;
         }
 
-        SqlCommand NewCommand(SqlPreCommandSimple preCommand, SqlConnection overridenConnection, CommandType commandType)
+        SqlCommand NewCommand(SqlPreCommandSimple preCommand, SqlConnection? overridenConnection, CommandType commandType)
         {
             SqlCommand cmd = new SqlCommand { CommandType = commandType };
 
@@ -153,9 +153,9 @@ SqlCommand NewCommand(SqlPreCommandSimple preCommand, SqlConnection overridenCon
             return cmd;
         }
 
-        protected internal override object ExecuteScalar(SqlPreCommandSimple preCommand, CommandType commandType)
+        protected internal override object? ExecuteScalar(SqlPreCommandSimple preCommand, CommandType commandType)
         {
-            using (SqlConnection con = EnsureConnection())
+            using (SqlConnection? con = EnsureConnection())
             using (SqlCommand cmd = NewCommand(preCommand, con, commandType))
             using (HeavyProfiler.Log("SQL", () => preCommand.sp_executesql()))
             {
@@ -181,7 +181,7 @@ protected internal override object ExecuteScalar(SqlPreCommandSimple preCommand,
 
         protected internal override int ExecuteNonQuery(SqlPreCommandSimple preCommand, CommandType commandType)
         {
-            using (SqlConnection con = EnsureConnection())
+            using (SqlConnection? con = EnsureConnection())
             using (SqlCommand cmd = NewCommand(preCommand, con, commandType))
             using (HeavyProfiler.Log("SQL", () => preCommand.sp_executesql()))
             {
@@ -207,7 +207,7 @@ public void ExecuteDataReaderDependency(SqlPreCommandSimple preCommand, OnChange
             retry:
             try
             {
-                using (SqlConnection con = EnsureConnection())
+                using (SqlConnection? con = EnsureConnection())
                 using (SqlCommand cmd = NewCommand(preCommand, con, commandType))
                 using (HeavyProfiler.Log("SQL-Dependency"))
                 using (HeavyProfiler.Log("SQL", () => preCommand.sp_executesql()))
@@ -308,7 +308,7 @@ protected internal override async Task<DbDataReaderWithCommand> UnsafeExecuteDat
 
         protected internal override DataTable ExecuteDataTable(SqlPreCommandSimple preCommand, CommandType commandType)
         {
-            using (SqlConnection con = EnsureConnection())
+            using (SqlConnection? con = EnsureConnection())
             using (SqlCommand cmd = NewCommand(preCommand, con, commandType))
             using (HeavyProfiler.Log("SQL", () => preCommand.sp_executesql()))
             {
@@ -333,7 +333,7 @@ protected internal override DataTable ExecuteDataTable(SqlPreCommandSimple preCo
 
         protected internal override DataSet ExecuteDataSet(SqlPreCommandSimple preCommand, CommandType commandType)
         {
-            using (SqlConnection con = EnsureConnection())
+            using (SqlConnection? con = EnsureConnection())
             using (SqlCommand cmd = NewCommand(preCommand, con, commandType))
             using (HeavyProfiler.Log("SQL", () => preCommand.sp_executesql()))
             {
@@ -387,13 +387,12 @@ Exception ReplaceException(Exception ex, SqlPreCommandSimple command)
                 }
             }
 
-            return ex;
-
+            return ex! /*CSBUG*/;
         }
 
         protected internal override void BulkCopy(DataTable dt, ObjectName destinationTable, SqlBulkCopyOptions options, int? timeout)
         {
-            using (SqlConnection con = EnsureConnection())
+            using (SqlConnection? con = EnsureConnection())
             using (SqlBulkCopy bulkCopy = new SqlBulkCopy(
                 options.HasFlag(SqlBulkCopyOptions.UseInternalTransaction) ? con : (SqlConnection)Transaction.CurrentConnection,
                 options,
@@ -448,7 +447,7 @@ public override DbConnection CreateConnection()
 
         public override ParameterBuilder ParameterBuilder { get; protected set; }
 
-        public override void CleanDatabase(DatabaseName databaseName)
+        public override void CleanDatabase(DatabaseName? databaseName)
         {
             SqlConnectorScripts.RemoveAllScript(databaseName).ExecuteLeaves();
             SqlConnectorScripts.ShrinkDatabase(DatabaseName());
@@ -498,11 +497,11 @@ public override SqlPreCommand ShrinkDatabase(string schemaName)
                             new SqlPreCommandSimple("DECLARE @fileID BIGINT"),
                             new SqlPreCommandSimple("SET @fileID = (SELECT FILE_IDEX((SELECT TOP(1)name FROM sys.database_files WHERE type = 1)))"),
                             new SqlPreCommandSimple("DBCC SHRINKFILE(@fileID, 1)"),
-                        }.Combine(Spacing.Simple).PlainSqlCommand(),
+                        }.Combine(Spacing.Simple)!.PlainSqlCommand(),
                         new SqlPreCommandSimple("ALTER DATABASE {0} SET RECOVERY FULL WITH NO_WAIT".FormatWith(schemaName)),
                     }.Combine(Spacing.Simple),
                 new SqlPreCommandSimple("DBCC SHRINKDATABASE ( {0} , TRUNCATEONLY )".FormatWith(schemaName))
-            }.Combine(Spacing.Simple);
+            }.Combine(Spacing.Simple)!;
         }
 
         public override bool AllowsConvertToDate
@@ -535,7 +534,7 @@ public override bool SupportsTemporalTables
 
     public class SqlParameterBuilder : ParameterBuilder
     {
-        public override DbParameter CreateParameter(string parameterName, SqlDbType sqlType, string udtTypeName, bool nullable, object value)
+        public override DbParameter CreateParameter(string parameterName, SqlDbType sqlType, string? udtTypeName, bool nullable, object? value)
         {
             if (IsDate(sqlType))
                 AssertDateTime((DateTime?)value);
@@ -554,7 +553,7 @@ public override DbParameter CreateParameter(string parameterName, SqlDbType sqlT
             return result;
         }
 
-        public override MemberInitExpression ParameterFactory(Expression parameterName, SqlDbType sqlType, string udtTypeName, bool nullable, Expression value)
+        public override MemberInitExpression ParameterFactory(Expression parameterName, SqlDbType sqlType, string? udtTypeName, bool nullable, Expression value)
         {
             Expression valueExpr = Expression.Convert(IsDate(sqlType) ? Expression.Call(miAsserDateTime, Expression.Convert(value, typeof(DateTime?))) : value, typeof(object));
 
@@ -692,7 +691,7 @@ exec sp_executesql @sql
 close cur
 deallocate cur";
 
-        public static SqlPreCommand RemoveAllScript(DatabaseName databaseName)
+        public static SqlPreCommand RemoveAllScript(DatabaseName? databaseName)
         {
             var schemas = SqlBuilder.SystemSchemas.ToString(a => "'" + a + "'", ", ");
 
@@ -703,10 +702,10 @@ public static SqlPreCommand RemoveAllScript(DatabaseName databaseName)
                 Connector.Current.SupportsTemporalTables ? new SqlPreCommandSimple(Use(databaseName, StopSystemVersioning)) : null,
                 new SqlPreCommandSimple(Use(databaseName, RemoveAllTablesScript)),
                 new SqlPreCommandSimple(Use(databaseName, RemoveAllSchemasScript.FormatWith(schemas)))
-                );
+                )!;
         }
 
-        static string Use(DatabaseName databaseName, string script)
+        static string Use(DatabaseName? databaseName, string script)
         {
             if (databaseName == null)
                 return script;
diff --git a/Signum.Engine/Database.cs b/Signum.Engine/Database.cs
index 9ab46cf0fe..0742be5554 100644
--- a/Signum.Engine/Database.cs
+++ b/Signum.Engine/Database.cs
@@ -85,7 +85,7 @@ public static T Retrieve<T>(this Lite<T> lite) where T : class, IEntity
             if (lite.EntityOrNull == null)
                 lite.SetEntity(Retrieve(lite.EntityType, lite.Id));
 
-            return lite.EntityOrNull;
+            return lite.EntityOrNull!;
         }
 
         public static async Task<T> RetrieveAsyc<T>(this Lite<T> lite, CancellationToken token) where T : class, IEntity
@@ -96,7 +96,7 @@ public static async Task<T> RetrieveAsyc<T>(this Lite<T> lite, CancellationToken
             if (lite.EntityOrNull == null)
                 lite.SetEntity(await RetrieveAsync(lite.EntityType, lite.Id, token));
 
-            return lite.EntityOrNull;
+            return lite.EntityOrNull!;
         }
 
 
@@ -212,7 +212,7 @@ public static async Task<T> RetrieveAsync<T>(PrimaryKey id, CancellationToken to
             }
         }
 
-        static CacheControllerBase<T> GetCacheController<T>() where T : Entity
+        static CacheControllerBase<T>? GetCacheController<T>() where T : Entity
         {
             CacheControllerBase<T> cc = Schema.Current.CacheController<T>();
 
@@ -224,7 +224,7 @@ static CacheControllerBase<T> GetCacheController<T>() where T : Entity
             return cc;
         }
 
-        static FilterQueryResult<T> GetFilterQuery<T>() where T : Entity
+        static FilterQueryResult<T>? GetFilterQuery<T>() where T : Entity
         {
             if (EntityCache.HasRetriever) //Filtering is not necessary when retrieving IBA?
                 return null;
@@ -314,7 +314,7 @@ public static async Task<Lite<T>> RetrieveLiteAsync<T>(PrimaryKey id, Cancellati
             }
         }
 
-        public static Lite<T> FillToString<T>(this Lite<T> lite) where T : class, IEntity
+        public static Lite<T>? FillToString<T>(this Lite<T> lite) where T : class, IEntity
         {
             if (lite == null)
                 return null;
@@ -326,9 +326,6 @@ public static Lite<T> FillToString<T>(this Lite<T> lite) where T : class, IEntit
 
         public static async Task<Lite<T>> FillToStringAsync<T>(this Lite<T> lite, CancellationToken token) where T : class, IEntity
         {
-            if (lite == null)
-                return null;
-
             lite.SetToString(await GetToStrAsync(lite.EntityType, lite.Id, token));
 
             return lite;
@@ -629,9 +626,9 @@ public static async Task<List<Lite<Entity>>> RetrieveAllLiteAsync(Type type, Can
         }
 
 
-        private static GenericInvoker<Func<List<PrimaryKey>, string, IList>> giRetrieveList =
-            new GenericInvoker<Func<List<PrimaryKey>, string, IList>>((ids, message) => RetrieveList<Entity>(ids, message));
-        public static List<T> RetrieveList<T>(List<PrimaryKey> ids, string message = null)
+        private static GenericInvoker<Func<List<PrimaryKey>, string?, IList>> giRetrieveList =
+            new GenericInvoker<Func<List<PrimaryKey>, string?, IList>>((ids, message) => RetrieveList<Entity>(ids, message));
+        public static List<T> RetrieveList<T>(List<PrimaryKey> ids, string? message = null)
             where T : Entity
         {
             using (HeavyProfiler.Log("DBRetrieve", () => "List<{0}>".FormatWith(typeof(T).TypeName())))
@@ -639,7 +636,7 @@ public static List<T> RetrieveList<T>(List<PrimaryKey> ids, string message = nul
                 if (ids == null)
                     throw new ArgumentNullException(nameof(ids));
                 List<PrimaryKey> remainingIds;
-                Dictionary<PrimaryKey, T> result = null;
+                Dictionary<PrimaryKey, T>? result = null;
                 if (EntityCache.Created)
                 {
                     result = ids.Select(id => EntityCache.Get<T>(id)).NotNull().ToDictionary(a => a.Id);
@@ -677,7 +674,7 @@ public static List<T> RetrieveList<T>(List<PrimaryKey> ids, string message = nul
             }
         }
 
-        static List<T> RetrieveFromDatabaseOrCache<T>(List<PrimaryKey> ids, string message = null) where T : Entity
+        static List<T> RetrieveFromDatabaseOrCache<T>(List<PrimaryKey> ids, string? message = null) where T : Entity
         {
             var cc = GetCacheController<T>();
             if (cc != null)
@@ -733,7 +730,7 @@ public static async Task<List<T>> RetrieveListAsync<T>(List<PrimaryKey> ids, Can
                 if (ids == null)
                     throw new ArgumentNullException(nameof(ids));
                 List<PrimaryKey> remainingIds;
-                Dictionary<PrimaryKey, T> result = null;
+                Dictionary<PrimaryKey, T>? result = null;
                 if (EntityCache.Created)
                 {
                     result = ids.Select(id => EntityCache.Get<T>(id)).NotNull().ToDictionary(a => a.Id);
@@ -805,7 +802,7 @@ static async Task<List<T>> RetrieveFromDatabaseOrCache<T>(List<PrimaryKey> ids,
             return task.SelectMany(list => list).ToList();
         }
 
-        public static List<Entity> RetrieveList(Type type, List<PrimaryKey> ids, string message = null)
+        public static List<Entity> RetrieveList(Type type, List<PrimaryKey> ids, string? message = null)
         {
             if (type == null)
                 throw new ArgumentNullException(nameof(type));
@@ -902,7 +899,7 @@ public static async Task<List<Lite<Entity>>> RetrieveListLite(Type type, List<Pr
             return list.Cast<Lite<Entity>>().ToList();
         }
 
-        public static List<T> RetrieveFromListOfLite<T>(this IEnumerable<Lite<T>> lites, string message = null)
+        public static List<T> RetrieveFromListOfLite<T>(this IEnumerable<Lite<T>> lites, string? message = null)
             where T : class, IEntity
         {
             if (lites == null)
@@ -1262,7 +1259,7 @@ public static IQueryable<T> View<T>()
         #endregion
 
         #region UnsafeDelete
-        public static int UnsafeDelete<T>(this IQueryable<T> query, string message = null)
+        public static int UnsafeDelete<T>(this IQueryable<T> query, string? message = null)
             where T : Entity
         {
             if (message != null)
@@ -1286,7 +1283,7 @@ public static int UnsafeDelete<T>(this IQueryable<T> query, string message = nul
             }
         }
 
-        public static int UnsafeDeleteMList<E, V>(this IQueryable<MListElement<E, V>> mlistQuery, string message = null)
+        public static int UnsafeDeleteMList<E, V>(this IQueryable<MListElement<E, V>> mlistQuery, string? message = null)
             where E : Entity
         {
             if (message != null)
@@ -1309,7 +1306,7 @@ public static int UnsafeDeleteMList<E, V>(this IQueryable<MListElement<E, V>> ml
             }
         }
 
-        public static int UnsafeDeleteView<T>(this IQueryable<T> query, string message = null)
+        public static int UnsafeDeleteView<T>(this IQueryable<T> query, string? message = null)
            where T : IView
         {
             if (message != null)
@@ -1409,7 +1406,7 @@ public static IUpdateablePart<A, V> UnsafeUpdateViewPart<A, V>(this IQueryable<A
             return new UpdateablePart<A, V>(query, partSelector, null);
         }
 
-        public static int Execute(this IUpdateable update, string message = null)
+        public static int Execute(this IUpdateable update, string? message = null)
         {
             if (message != null)
                 return SafeConsole.WaitRows(message == "auto" ? $"Updating { update.EntityType.TypeName()}" : message,
@@ -1453,13 +1450,13 @@ public static int ExecuteChunks(this IUpdateable update, int chunkSize = 10000,
 
         #region UnsafeInsert
 
-        public static int UnsafeInsert<E>(this IQueryable<E> query, string message = null)
+        public static int UnsafeInsert<E>(this IQueryable<E> query, string? message = null)
               where E : Entity
         {
             return query.UnsafeInsert(a => a, message);
         }
 
-        public static int UnsafeInsert<T, E>(this IQueryable<T> query, Expression<Func<T, E>> constructor, string message = null)
+        public static int UnsafeInsert<T, E>(this IQueryable<T> query, Expression<Func<T, E>> constructor, string? message = null)
             where E : Entity
         {
             if (message != null)
@@ -1485,13 +1482,13 @@ public static int UnsafeInsert<T, E>(this IQueryable<T> query, Expression<Func<T
             }
         }
 
-        public static int UnsafeInsertMList<E, V>(this IQueryable<MListElement<E, V>> query, Expression<Func<E, MList<V>>> mListProperty, string message = null)
+        public static int UnsafeInsertMList<E, V>(this IQueryable<MListElement<E, V>> query, Expression<Func<E, MList<V>>> mListProperty, string? message = null)
             where E : Entity
         {
             return query.UnsafeInsertMList(mListProperty, a => a, message);
         }
 
-        public static int UnsafeInsertMList<T, E, V>(this IQueryable<T> query, Expression<Func<E, MList<V>>> mListProperty, Expression<Func<T, MListElement<E, V>>> constructor, string message = null)
+        public static int UnsafeInsertMList<T, E, V>(this IQueryable<T> query, Expression<Func<E, MList<V>>> mListProperty, Expression<Func<T, MListElement<E, V>>> constructor, string? message = null)
                where E : Entity
         {
 
@@ -1518,7 +1515,7 @@ public static int UnsafeInsertMList<T, E, V>(this IQueryable<T> query, Expressio
             }
         }
 
-        public static int UnsafeInsertView<T, E>(this IQueryable<T> query, Expression<Func<T, E>> constructor, string message = null)
+        public static int UnsafeInsertView<T, E>(this IQueryable<T> query, Expression<Func<T, E>> constructor, string? message = null)
             where E : IView
         {
             if (message != null)
@@ -1546,7 +1543,7 @@ public static int UnsafeInsertView<T, E>(this IQueryable<T> query, Expression<Fu
 
         #endregion
 
-        public static void Merge<E, A>(string title, IQueryable<E> should, IQueryable<E> current, Expression<Func<E, A>> getKey, List<Expression<Func<E, object>>> toUpdate = null)
+        public static void Merge<E, A>(string? title, IQueryable<E> should, IQueryable<E> current, Expression<Func<E, A>> getKey, List<Expression<Func<E, object>>>? toUpdate = null)
             where E : Entity
             where A : class
         {
@@ -1560,12 +1557,12 @@ public static void Merge<E, A>(string title, IQueryable<E> should, IQueryable<E>
             if (toUpdate != null)
             {
                 var updater = (from c in current
-                              join s in should on getKey.Evaluate(c) equals getKey.Evaluate(s)
-                              select new { c, s }).UnsafeUpdatePart(a => a.c);
+                               join s in should on getKey.Evaluate(c) equals getKey.Evaluate(s)
+                               select new { c, s }).UnsafeUpdatePart(a => a.c!); /*CSBUG*/
 
                 foreach (var prop in toUpdate)
                 {
-                    updater = updater.Set(prop, a => prop.Evaluate(a.s));
+                    updater = updater.Set(prop, a => prop.Evaluate(a.s!));/*CSBUG*/
                 }
 
                 updater.Execute(title != null ? "auto" : null);
@@ -1598,7 +1595,7 @@ public static List<T> ToListWait<T>(this IQueryable<T> query, string message)
             return result;
         }
 
-        public static List<T> ToListWait<T>(this IQueryable<T> query, int timeoutSeconds, string message = null)
+        public static List<T> ToListWait<T>(this IQueryable<T> query, int timeoutSeconds, string? message = null)
         {
             using (Connector.CommandTimeoutScope(timeoutSeconds))
             {
@@ -1631,7 +1628,7 @@ public SignumTable(QueryProvider provider, ITable table)
     public interface IUpdateable
     {
         IQueryable Query { get; }
-        LambdaExpression PartSelector { get; }
+        LambdaExpression? PartSelector { get; }
         IEnumerable<SetterExpressions> SetterExpressions { get; }
 
         Type EntityType { get; }
@@ -1657,7 +1654,7 @@ class UpdateablePart<A, T> : IUpdateablePart<A, T>
         Expression<Func<A, T>> partSelector;
         ReadOnlyCollection<SetterExpressions> settersExpressions;
 
-        public UpdateablePart(IQueryable<A> query, Expression<Func<A, T>> partSelector, IEnumerable<SetterExpressions> setters)
+        public UpdateablePart(IQueryable<A> query, Expression<Func<A, T>> partSelector, IEnumerable<SetterExpressions>? setters)
         {
             this.query = query;
             this.partSelector = partSelector;
@@ -1666,7 +1663,7 @@ public UpdateablePart(IQueryable<A> query, Expression<Func<A, T>> partSelector,
 
         public IQueryable Query { get { return this.query; } }
 
-        public LambdaExpression PartSelector { get { return this.partSelector; } }
+        public LambdaExpression? PartSelector { get { return this.partSelector; } }
 
         public IEnumerable<SetterExpressions> SetterExpressions { get { return this.settersExpressions; } }
 
@@ -1722,7 +1719,7 @@ class Updateable<T> : IUpdateable<T>
         IQueryable<T> query;
         ReadOnlyCollection<SetterExpressions> settersExpressions;
 
-        public Updateable(IQueryable<T> query, IEnumerable<SetterExpressions> setters)
+        public Updateable(IQueryable<T> query, IEnumerable<SetterExpressions>? setters)
         {
             this.query = query;
             this.settersExpressions = (setters ?? Enumerable.Empty<SetterExpressions>()).ToReadOnly();
@@ -1730,7 +1727,7 @@ public Updateable(IQueryable<T> query, IEnumerable<SetterExpressions> setters)
 
         public IQueryable Query { get { return this.query; } }
 
-        public LambdaExpression PartSelector { get { return null; } }
+        public LambdaExpression? PartSelector { get { return null; } }
 
         public IEnumerable<SetterExpressions> SetterExpressions { get { return this.settersExpressions; } }
 
diff --git a/Signum.Engine/DynamicQuery/ColumnDescriptionFactory.cs b/Signum.Engine/DynamicQuery/ColumnDescriptionFactory.cs
index 002c3f9feb..39b17e532f 100644
--- a/Signum.Engine/DynamicQuery/ColumnDescriptionFactory.cs
+++ b/Signum.Engine/DynamicQuery/ColumnDescriptionFactory.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using Signum.Entities;
 using Signum.Entities.DynamicQuery;
@@ -12,14 +12,14 @@ namespace Signum.Engine.DynamicQuery
     public class ColumnDescriptionFactory
     {
         readonly internal Meta Meta;
-        public Func<string> OverrideDisplayName { get; set; }
-        public Func<string> OverrideIsAllowed { get; set; }
+        public Func<string>? OverrideDisplayName { get; set; }
+        public Func<string>? OverrideIsAllowed { get; set; }
 
         public string Name { get; internal set; }
         public Type Type { get; internal set; }
 
-        public string Format { get; set; }
-        public string Unit { get; set; }
+        public string? Format { get; set; }
+        public string? Unit { get; set; }
         Implementations? implementations;
         public Implementations? Implementations
         {
@@ -40,8 +40,8 @@ public Implementations? Implementations
             }
         }
 
-        PropertyRoute[] propertyRoutes;
-        public PropertyRoute[] PropertyRoutes
+        PropertyRoute[]? propertyRoutes;
+        public PropertyRoute[]? PropertyRoutes
         {
             get { return propertyRoutes; }
             set
@@ -60,7 +60,7 @@ public PropertyRoute[] PropertyRoutes
 
 
 
-        internal static string GetUnit(PropertyRoute[] routes)
+        internal static string? GetUnit(PropertyRoute[] routes)
         {
             switch (routes[0].PropertyRouteType)
             {
@@ -76,7 +76,7 @@ internal static string GetUnit(PropertyRoute[] routes)
             throw new InvalidOperationException();
         }
 
-        internal static string GetFormat(PropertyRoute[] routes)
+        internal static string? GetFormat(PropertyRoute[] routes)
         {
             switch (routes[0].PropertyRouteType)
             {
@@ -124,9 +124,9 @@ public string DisplayName()
 
             if (propertyRoutes != null &&
                 propertyRoutes[0].PropertyRouteType == PropertyRouteType.FieldOrProperty &&
-                propertyRoutes[0].PropertyInfo.Name == Name)
+                propertyRoutes[0].PropertyInfo!.Name == Name)
             {
-                var result = propertyRoutes.Select(pr=>pr.PropertyInfo.NiceName()).Only();
+                var result = propertyRoutes.Select(pr => pr.PropertyInfo!.NiceName()).Only();
                 if (result != null)
                     return result;
             }
@@ -145,7 +145,7 @@ public bool IsEntity
             get { return this.Name == ColumnDescription.Entity; }
         }
 
-        public string IsAllowed()
+        public string? IsAllowed()
         {
             if (OverrideIsAllowed != null)
                 return OverrideIsAllowed();
@@ -156,13 +156,13 @@ public string IsAllowed()
             return null;
         }
 
-        Type processedType;
+        Type? processedType;
         Type ProcessedType
         {
             get
             {
-                return processedType ??
-                    (processedType = (Reflector.IsIEntity(Type) ? Lite.Generate(Type) :
+                return processedType ?? (processedType = 
+                    (Reflector.IsIEntity(Type) ? Lite.Generate(Type) :
                     Type.UnNullify() == typeof(PrimaryKey) ? UnwrapFromPropertRoutes().Nullify() :
                     Type.Nullify()));
             }
@@ -170,21 +170,19 @@ Type ProcessedType
 
         private Type UnwrapFromPropertRoutes()
         {
-            if(propertyRoutes.IsNullOrEmpty())
-                throw new InvalidOperationException("Impossible to determine the underlying type of the PrimaryKey of column {0} if PropertyRoutes is not set"
-                    .FormatWith(this.Name));
+            if(propertyRoutes == null || propertyRoutes.Length == 0)
+                throw new InvalidOperationException($"Impossible to determine the underlying type of the PrimaryKey of column {this.Name} if PropertyRoutes is not set");
 
             return propertyRoutes.Select(a => PrimaryKey.Type(a.RootType)).Distinct().SingleEx();
         }
 
         public ColumnDescription BuildColumnDescription()
         {
-            return new ColumnDescription(Name, ProcessedType)
+            return new ColumnDescription(Name, ProcessedType, DisplayName())
             {
                 PropertyRoutes = propertyRoutes,
                 Implementations = Implementations,
-
-                DisplayName = DisplayName(),
+                
                 Format = Format,
                 Unit = Unit,
             };
diff --git a/Signum.Engine/DynamicQuery/ExpressionContainer.cs b/Signum.Engine/DynamicQuery/ExpressionContainer.cs
index cf5d378562..3f87872350 100644
--- a/Signum.Engine/DynamicQuery/ExpressionContainer.cs
+++ b/Signum.Engine/DynamicQuery/ExpressionContainer.cs
@@ -49,7 +49,7 @@ public IEnumerable<QueryToken> GetExtensions(QueryToken parent)
             return extensionsTokens.Concat(dicExtensionsTokens);
         }
 
-        public ExtensionInfo Register<E, S>(Expression<Func<E, S>> lambdaToMethodOrProperty, Func<string> niceName = null)
+        public ExtensionInfo Register<E, S>(Expression<Func<E, S>> lambdaToMethodOrProperty, Func<string>? niceName = null)
         {
             using (HeavyProfiler.LogNoStackTrace("RegisterExpression"))
             {
@@ -106,17 +106,12 @@ public ExtensionDictionaryInfo<T, KVP, K, V> RegisterDictionary<T, KVP, K, V>(
             Expression<Func<T, IEnumerable<KVP>>> collectionSelector,
             Expression<Func<KVP, K>> keySelector,
             Expression<Func<KVP, V>> valueSelector,
-            ResetLazy<HashSet<K>> allKeys = null)
+            ResetLazy<HashSet<K>>? allKeys = null)
             where T : Entity
+            where K : object
         {
-            var mei = new ExtensionDictionaryInfo<T, KVP, K, V>
-            {
-                CollectionSelector = collectionSelector,
-                KeySelector = keySelector,
-                ValueSelector = valueSelector,
-
-                AllKeys = allKeys ?? GetAllKeysLazy<T, KVP, K>(collectionSelector, keySelector)
-            };
+            var mei = new ExtensionDictionaryInfo<T, KVP, K, V>(collectionSelector, keySelector, valueSelector,
+                allKeys ?? GetAllKeysLazy<T, KVP, K>(collectionSelector, keySelector));
 
             RegisteredExtensionsDictionaries.Add(PropertyRoute.Root(typeof(T)), mei);
 
@@ -128,20 +123,14 @@ public ExtensionDictionaryInfo<M, KVP, K, V> RegisterDictionaryInEmbedded<T, M,
                 Expression<Func<M, IEnumerable<KVP>>> collectionSelector,
                 Expression<Func<KVP, K>> keySelector,
                 Expression<Func<KVP, V>> valueSelector,
-                ResetLazy<HashSet<K>> allKeys = null)
+                ResetLazy<HashSet<K>>? allKeys = null)
             where T : Entity
             where M : ModifiableEntity
-        
+            where K : object
         {
-            var mei = new ExtensionDictionaryInfo<M, KVP, K, V>
-            {
-                CollectionSelector = collectionSelector,
-                KeySelector = keySelector,
-                ValueSelector = valueSelector,
-
-                AllKeys = allKeys ?? GetAllKeysLazy<T, KVP, K>(CombineSelectors(embeddedSelector, collectionSelector) , keySelector)
-            };
-
+            var mei = new ExtensionDictionaryInfo<M, KVP, K, V>(collectionSelector, keySelector, valueSelector,
+                allKeys ?? GetAllKeysLazy<T, KVP, K>(CombineSelectors(embeddedSelector, collectionSelector), keySelector));
+            
             RegisteredExtensionsDictionaries.Add(PropertyRoute.Construct(embeddedSelector), mei);
 
             return mei;
@@ -184,6 +173,7 @@ public interface IExtensionDictionaryInfo
     }
 
     public class ExtensionDictionaryInfo<T, KVP, K, V> : IExtensionDictionaryInfo
+        where K : object
     {
         public ResetLazy<HashSet<K>> AllKeys;
 
@@ -195,6 +185,18 @@ public class ExtensionDictionaryInfo<T, KVP, K, V> : IExtensionDictionaryInfo
 
         ConcurrentDictionary<QueryToken, ExtensionRouteInfo> metas = new ConcurrentDictionary<QueryToken, ExtensionRouteInfo>();
 
+        public ExtensionDictionaryInfo(
+            Expression<Func<T, IEnumerable<KVP>>> collectionSelector, 
+            Expression<Func<KVP, K>> keySelector, 
+            Expression<Func<KVP, V>> valueSelector,
+            ResetLazy<HashSet<K>> allKeys)
+        {
+            CollectionSelector = collectionSelector;
+            KeySelector = keySelector;
+            ValueSelector = valueSelector;
+            AllKeys = allKeys;
+        }
+
         public IEnumerable<QueryToken> GetAllTokens(QueryToken parent)
         {
             var info = metas.GetOrAdd(parent, qt =>
@@ -202,17 +204,15 @@ public IEnumerable<QueryToken> GetAllTokens(QueryToken parent)
                 Expression<Func<T, V>> lambda = t => ValueSelector.Evaluate(CollectionSelector.Evaluate(t).SingleOrDefaultEx());
 
                 Expression e = MetadataVisitor.JustVisit(lambda, MetaExpression.FromToken(qt, typeof(T)));
-
-                MetaExpression me = e as MetaExpression;
-
+                
                 var result = new ExtensionRouteInfo();
 
-                if (me?.Meta is CleanMeta cm && cm.PropertyRoutes.Any())
+                if (e is MetaExpression me && me.Meta is CleanMeta cm && cm.PropertyRoutes.Any())
                 {
-                    var cleanType = me.Type.CleanType();
+                    var cleanType = me!.Type.CleanType();
 
                     result.PropertyRoute = cm.PropertyRoutes.Only();
-                    result.Implementations = me.Meta.Implementations;
+                    result.Implementations = me!.Meta.Implementations;
                     result.Format = ColumnDescriptionFactory.GetFormat(cm.PropertyRoutes);
                     result.Unit = ColumnDescriptionFactory.GetUnit(cm.PropertyRoutes);
                 }
@@ -235,8 +235,7 @@ public IEnumerable<QueryToken> GetAllTokens(QueryToken parent)
     public class ExtensionInfo
     {
         ConcurrentDictionary<QueryToken, ExtensionRouteInfo> metas = new ConcurrentDictionary<QueryToken, ExtensionRouteInfo>();
-
-
+        
         public ExtensionInfo(Type sourceType, LambdaExpression lambda, Type type, string key, Func<string> niceName)
         {
             this.Type = type;
@@ -254,10 +253,10 @@ public ExtensionInfo(Type sourceType, LambdaExpression lambda, Type type, string
         public bool Inherit = true;
 
         public Implementations? ForceImplementations;
-        public PropertyRoute ForcePropertyRoute;
-        public string ForceFormat;
-        public string ForceUnit;
-        public Func<string> ForceIsAllowed;
+        public PropertyRoute? ForcePropertyRoute;
+        public string? ForceFormat;
+        public string? ForceUnit;
+        public Func<string?>? ForceIsAllowed;
 
 
         internal readonly LambdaExpression Lambda;
@@ -269,7 +268,7 @@ protected internal virtual ExtensionToken CreateToken(QueryToken parent)
             {
                 Expression e = MetadataVisitor.JustVisit(Lambda, MetaExpression.FromToken(qt, SourceType));
 
-                MetaExpression me;
+                MetaExpression? me;
 
                 if (this.IsProjection)
                 {
@@ -287,7 +286,7 @@ protected internal virtual ExtensionToken CreateToken(QueryToken parent)
 
                 var result = new ExtensionRouteInfo();
 
-                if (me?.Meta is CleanMeta cleanMeta && cleanMeta.PropertyRoutes.Any())
+                if (me != null && me.Meta is CleanMeta cleanMeta && cleanMeta.PropertyRoutes.Any())
                 {
                     result.PropertyRoute = cleanMeta.PropertyRoutes.Only();
                     result.Implementations = me.Meta.Implementations;
@@ -305,7 +304,7 @@ protected internal virtual ExtensionToken CreateToken(QueryToken parent)
                 result.IsAllowed = () => (me == null || me.Meta == null) ? null : me.Meta.IsAllowed();
 
                 if (ForcePropertyRoute != null)
-                    result.PropertyRoute = ForcePropertyRoute;
+                    result.PropertyRoute = ForcePropertyRoute!;
 
                 if (ForceImplementations != null)
                     result.Implementations = ForceImplementations;
@@ -317,7 +316,7 @@ protected internal virtual ExtensionToken CreateToken(QueryToken parent)
                     result.Unit = ForceUnit;
 
                 if (ForceIsAllowed != null)
-                    result.IsAllowed = ForceIsAllowed;
+                    result.IsAllowed = ForceIsAllowed!;
 
                 return result;
             });
@@ -327,12 +326,14 @@ protected internal virtual ExtensionToken CreateToken(QueryToken parent)
         }
     }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     public class ExtensionRouteInfo
     {
-        public string Format;
-        public string Unit;
+        public string? Format;
+        public string? Unit;
         public Implementations? Implementations;
-        public Func<string> IsAllowed;
-        public PropertyRoute PropertyRoute;
+        public Func<string?> IsAllowed;
+        public PropertyRoute? PropertyRoute;
     }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 }
diff --git a/Signum.Engine/Engine/ProgressExtensions.cs b/Signum.Engine/Engine/ProgressExtensions.cs
index f48d41206c..deb31b983a 100644
--- a/Signum.Engine/Engine/ProgressExtensions.cs
+++ b/Signum.Engine/Engine/ProgressExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using Signum.Engine.Maps;
 using System.Threading;
@@ -25,10 +25,10 @@ public static class ProgressExtensions
 
         public static List<R> ProgressSelect<T, R>(this IEnumerable<T> collection,
             Func<T, R> selector,
-            Func<T, string> elementID = null,
-            LogWriter writer = null,
+            Func<T, string>? elementID = null,
+            LogWriter? writer = null,
             bool showProgress = true,
-            ParallelOptions parallelOptions = null)
+            ParallelOptions? parallelOptions = null)
         {
             List<R> result = new List<R>();
 
@@ -47,20 +47,20 @@ public static List<R> ProgressSelect<T, R>(this IEnumerable<T> collection,
         /// Executes an action for each element in the collection transactionally and showing the progress in the Console
         /// </summary>
         public static void ProgressForeach<T>(this IEnumerable<T> collection,
-            Func<T, string> elementID = null,
-            Action<T> action = null,
+            Func<T, string>? elementID = null,
+            Action<T>? action = null,
             bool transactional = true,
             bool showProgress = true,
-            LogWriter writer = null,
-            ParallelOptions parallelOptions = null,
-            Type disableIdentityFor = null)
+            LogWriter? writer = null,
+            ParallelOptions? parallelOptions = null,
+            Type? disableIdentityFor = null)
         {
             if (action == null)
                 throw new InvalidOperationException("no action specified");
 
             if (elementID == null)
             {
-                elementID = e => e.ToString();
+                elementID = e => e!.ToString();
             }
             if (writer == null)
                 writer = GetConsoleWriter();
@@ -90,7 +90,7 @@ public static void ProgressForeach<T>(this IEnumerable<T> collection,
                             using (table.PrimaryKey.Default != null
                                 ? null
                                 : Administrator.DisableIdentity(table.Name))
-                                action(item);
+                                action!(item);
                             tr.Commit();
                         }
                     });
@@ -105,7 +105,7 @@ public static void ProgressForeach<T>(this IEnumerable<T> collection,
         private static void ProgressForeachInternal<T>(this IEnumerable<T> collection,
             Func<T, string> elementID,
             LogWriter writer,
-            ParallelOptions parallelOptions,
+            ParallelOptions? parallelOptions,
             bool transactional,
             bool showProgress,
             Action<T> action
@@ -187,7 +187,7 @@ Action<T> action
                     lock (SafeConsole.SyncKey)
                         SafeConsole.WriteSameLine(pi.ToString());
 
-                Exception stopException = null;
+                Exception? stopException = null;
 
                 using (ExecutionContext.SuppressFlow())
                     Parallel.ForEach(col,
@@ -242,7 +242,7 @@ Action<T> action
 
         public static string DefaultLogFolder = "Log";
 
-        public static StreamWriter TryOpenAutoFlush(string fileName)
+        public static StreamWriter? TryOpenAutoFlush(string fileName)
         {
             if (string.IsNullOrEmpty(fileName))
                 return null;
diff --git a/Signum.Engine/Engine/SchemaSynchronizer.cs b/Signum.Engine/Engine/SchemaSynchronizer.cs
index 25abfd2ca1..1c35e66bcc 100644
--- a/Signum.Engine/Engine/SchemaSynchronizer.cs
+++ b/Signum.Engine/Engine/SchemaSynchronizer.cs
@@ -17,7 +17,7 @@ public static class SchemaSynchronizer
 
         public static Action<Dictionary<string, DiffTable>> SimplifyDiffTables;
 
-        public static SqlPreCommand SynchronizeTablesScript(Replacements replacements)
+        public static SqlPreCommand? SynchronizeTablesScript(Replacements replacements)
         {
             Schema s = Schema.Current;
 
@@ -127,7 +127,7 @@ 3. Drop {diff.Name}
 
 
 
-            Func<ObjectName, SqlPreCommand> DeleteAllForeignKey = tableName =>
+            Func<ObjectName, SqlPreCommand?> DeleteAllForeignKey = tableName =>
             {
                 var dropFks = (from t in databaseTables.Values
                                from c in t.Columns.Values
@@ -142,12 +142,12 @@ from c in t.Columns.Values
 
             using (replacements.WithReplacedDatabaseName())
             {
-                SqlPreCommand preRenameTables = preRenames.Select(a => SqlBuilder.RenameTable(a.Key, a.Value.Name)).Combine(Spacing.Double);
+                SqlPreCommand? preRenameTables = preRenames.Select(a => SqlBuilder.RenameTable(a.Key, a.Value.Name)).Combine(Spacing.Double);
 
                 if (preRenameTables != null)
                     preRenameTables.GoAfter = true;
 
-                SqlPreCommand createSchemas = Synchronizer.SynchronizeScriptReplacing(replacements, "Schemas", Spacing.Double,
+                SqlPreCommand? createSchemas = Synchronizer.SynchronizeScriptReplacing(replacements, "Schemas", Spacing.Double,
                     modelSchemas.ToDictionary(a => a.ToString()),
                     databaseSchemas.ToDictionary(a => a.ToString()),
                     createNew: (_, newSN) => SqlBuilder.CreateSchema(newSN),
@@ -156,7 +156,7 @@ from c in t.Columns.Values
                     );
 
                 //use database without replacements to just remove indexes
-                SqlPreCommand dropStatistics =
+                SqlPreCommand? dropStatistics =
                     Synchronizer.SynchronizeScript(Spacing.Double, modelTables, databaseTables,
                     createNew:  null,
                     removeOld:  (tn, dif) => SqlBuilder.DropStatistics(tn, dif.Stats),
@@ -167,7 +167,7 @@ from c in t.Columns.Values
                         return SqlBuilder.DropStatistics(tn, dif.Stats.Where(a => a.Columns.Any(removedColums.Contains)).ToList());
                     });
 
-                SqlPreCommand dropIndices =
+                SqlPreCommand? dropIndices =
                     Synchronizer.SynchronizeScript(Spacing.Double, modelTables, databaseTables,
                     createNew: null,
                     removeOld: (tn, dif) => dif.Indices.Values.Where(ix => !ix.IsPrimary).Select(ix => SqlBuilder.DropIndex(dif.Name, ix)).Combine(Spacing.Simple),
@@ -186,7 +186,7 @@ from c in t.Columns.Values
                         return changes;
                     });
 
-                SqlPreCommand dropIndicesHistory =
+                SqlPreCommand? dropIndicesHistory =
                     Synchronizer.SynchronizeScript(Spacing.Double, modelTablesHistory, databaseTablesHistory,
                     createNew: null,
                     removeOld: (tn, dif) => dif.Indices.Values.Where(ix => ix.Type != DiffIndexType.Clustered).Select(ix => SqlBuilder.DropIndex(dif.Name, ix)).Combine(Spacing.Simple),
@@ -205,7 +205,7 @@ from c in t.Columns.Values
                         return changes;
                     });
 
-                SqlPreCommand dropForeignKeys = Synchronizer.SynchronizeScript(
+                SqlPreCommand? dropForeignKeys = Synchronizer.SynchronizeScript(
                      Spacing.Double,
                      modelTables,
                      databaseTables,
@@ -226,9 +226,9 @@ from c in t.Columns.Values
                         dif.MultiForeignKeys.Select(fk => SqlBuilder.AlterTableDropConstraint(dif.Name, fk.Name)).Combine(Spacing.Simple))
                 );
 
-                SqlPreCommand preRenamePks = preRenames.Select(a => SqlBuilder.DropPrimaryKeyConstraint(a.Value)).Combine(Spacing.Double);
+                SqlPreCommand? preRenamePks = preRenames.Select(a => SqlBuilder.DropPrimaryKeyConstraint(a.Value)).Combine(Spacing.Double);
 
-                SqlPreCommand tables =
+                SqlPreCommand? tables =
                         Synchronizer.SynchronizeScript(
                         Spacing.Double,
                         modelTables,
@@ -243,7 +243,7 @@ from c in t.Columns.Values
                             var rename = !object.Equals(dif.Name, tab.Name) ? SqlBuilder.RenameOrMove(dif, tab) : null;
 
                             var disableSystemVersioning = (dif.TemporalType != SysTableTemporalType.None && 
-                            (tab.SystemVersioned == null || !object.Equals(replacements.Apply(Replacements.KeyTables, dif.TemporalTableName.ToString()), tab.SystemVersioned.TableName.ToString())) ?
+                            (tab.SystemVersioned == null || !object.Equals(replacements.Apply(Replacements.KeyTables, dif.TemporalTableName!.ToString()), tab.SystemVersioned.TableName.ToString())) ?
                                 SqlBuilder.AlterTableDisableSystemVersioning(tab.Name) : null);
 
                             var dropPeriod = (dif.Period != null &&
@@ -285,7 +285,7 @@ from c in t.Columns.Values
 
                                         difCol.DefaultEquals(tabCol) ? null : SqlPreCommand.Combine(Spacing.Simple,
                                             difCol.DefaultConstraint != null ? SqlBuilder.AlterTableDropConstraint(tab.Name, difCol.DefaultConstraint.Name) : null,
-                                            tabCol.Default != null ? SqlBuilder.AlterTableAddDefaultConstraint(tab.Name, SqlBuilder.GetDefaultConstaint(tab, tabCol)) : null),
+                                            tabCol.Default != null ? SqlBuilder.AlterTableAddDefaultConstraint(tab.Name, SqlBuilder.GetDefaultConstaint(tab, tabCol)!) : null),
 
                                         UpdateByFkChange(tn, difCol, tabCol, ChangeName, copyDataFrom)
                                     )
@@ -300,7 +300,7 @@ from c in t.Columns.Values
                                 SqlBuilder.AlterTableEnableSystemVersioning(tab).Do(a=>a.GoBefore = true) : null);
 
 
-                            SqlPreCommand combinedAddPeriod = null;
+                            SqlPreCommand? combinedAddPeriod = null;
                             if(addPeriod != null && columns is SqlPreCommandConcat cols)
                             {
                                 var periodRows = cols.Leaves().Where(pcs => pcs.Sql.Contains(" ADD ") && pcs.Sql.Contains("GENERATED ALWAYS AS ROW")).ToList();
@@ -322,14 +322,14 @@ from c in t.Columns.Values
                 if (tables != null)
                     tables.GoAfter = true;
 
-                SqlPreCommand historyTables = Synchronizer.SynchronizeScript(Spacing.Double, modelTablesHistory, databaseTablesHistory,
+                SqlPreCommand? historyTables = Synchronizer.SynchronizeScript(Spacing.Double, modelTablesHistory, databaseTablesHistory,
                     createNew: null,
                     removeOld: (tn, dif) => SqlBuilder.DropTable(dif.Name),
                     mergeBoth: (tn, tab, dif) => !object.Equals(dif.Name, tab.SystemVersioned.TableName) ? SqlBuilder.RenameOrChangeSchema(dif.Name, tab.SystemVersioned.TableName) : null);
 
-                SqlPreCommand syncEnums = SynchronizeEnumsScript(replacements);
+                SqlPreCommand? syncEnums = SynchronizeEnumsScript(replacements);
 
-                SqlPreCommand addForeingKeys = Synchronizer.SynchronizeScript(
+                SqlPreCommand? addForeingKeys = Synchronizer.SynchronizeScript(
                      Spacing.Double,
                      modelTables,
                      databaseTables,
@@ -362,7 +362,7 @@ from c in t.Columns.Values
 
                 bool? createMissingFreeIndexes = null;
 
-                SqlPreCommand addIndices =
+                SqlPreCommand? addIndices =
                     Synchronizer.SynchronizeScript(Spacing.Double, modelTables, databaseTables,
                     createNew: (tn, tab) => modelIndices[tab].Values.Where(a => !(a is PrimaryClusteredIndex)).Select(index => SqlBuilder.CreateIndex(index, null)).Combine(Spacing.Simple),
                     removeOld: null,
@@ -383,7 +383,7 @@ from c in t.Columns.Values
                         return SqlPreCommand.Combine(Spacing.Simple, controlledIndexes);
                     });
 
-                SqlPreCommand addIndicesHistory =
+                SqlPreCommand? addIndicesHistory =
                     Synchronizer.SynchronizeScript(Spacing.Double, modelTablesHistory, databaseTablesHistory,
                     createNew: (tn, tab) => modelIndices[tab].Values.Where(a => a.GetType() == typeof(Index)).Select(mix => SqlBuilder.CreateIndexBasic(mix, forHistoryTable: true)).Combine(Spacing.Simple),
                     removeOld: null,
@@ -404,7 +404,7 @@ from c in t.Columns.Values
                         return SqlPreCommand.Combine(Spacing.Simple, controlledIndexes);
                     });
 
-                SqlPreCommand dropSchemas = Synchronizer.SynchronizeScriptReplacing(replacements, "Schemas", Spacing.Double,
+                SqlPreCommand? dropSchemas = Synchronizer.SynchronizeScriptReplacing(replacements, "Schemas", Spacing.Double,
                     modelSchemas.ToDictionary(a => a.ToString()),
                     databaseSchemas.ToDictionary(a => a.ToString()),
                     createNew: null,
@@ -421,7 +421,7 @@ from c in t.Columns.Values
             }
         }
 
-        private static SqlPreCommandSimple NotNullUpdate(ITable tab, IColumn tabCol, Replacements rep, bool goBefore)
+        private static SqlPreCommandSimple? NotNullUpdate(ITable tab, IColumn tabCol, Replacements rep, bool goBefore)
         {
             var defaultValue = GetDefaultValue(tab, tabCol, rep, forNewColumn: false);
 
@@ -453,7 +453,7 @@ private static HashSet<SchemaName> DefaultGetSchemas(List<DatabaseName> list)
             return result;
         }
 
-        private static SqlPreCommand AlterTableAddColumnDefault(ITable table, IColumn column, Replacements rep, string forceDefaultValue)
+        private static SqlPreCommand AlterTableAddColumnDefault(ITable table, IColumn column, Replacements rep, string? forceDefaultValue)
         {
             if (column.Nullable == IsNullable.Yes || column.Identity || column.Default != null || column is ImplementationColumn)
                 return SqlBuilder.AlterTableAddColumn(table, column);
@@ -475,19 +475,18 @@ private static SqlPreCommand AlterTableAddColumnDefault(ITable table, IColumn co
                     SqlBuilder.AlterTableAddColumn(table, column).Do(a => a.GoAfter = true),
                     new SqlPreCommandSimple($@"UPDATE {table.Name} SET
     {column.Name} = {SqlBuilder.Quote(column.SqlDbType, defaultValue)}
-WHERE {where}"));
+WHERE {where}"))!;
             }
 
-            var tempDefault = new SqlBuilder.DefaultConstraint
-            {
-                ColumnName = column.Name,
-                Name = "DF_TEMP_" + column.Name,
-                QuotedDefinition = SqlBuilder.Quote(column.SqlDbType, defaultValue),
-            };
+            var tempDefault = new SqlBuilder.DefaultConstraint(
+                columnName: column.Name, 
+                name: "DF_TEMP_" + column.Name, 
+                quotedDefinition : SqlBuilder.Quote(column.SqlDbType, defaultValue)
+            );
 
             return SqlPreCommand.Combine(Spacing.Simple,
                 SqlBuilder.AlterTableAddColumn(table, column, tempDefault),
-                SqlBuilder.AlterTableDropConstraint(table.Name, tempDefault.Name));
+                SqlBuilder.AlterTableDropConstraint(table.Name, tempDefault.Name))!;
         }
 
         internal static SqlPreCommand CopyData(ITable newTable, DiffTable oldTable, Replacements rep)
@@ -508,10 +507,10 @@ internal static SqlPreCommand CopyData(ITable newTable, DiffTable oldTable, Repl
                 SqlBuilder.SetIdentityInsert(newTable.Name, true),
                 insertSelect,
                 SqlBuilder.SetIdentityInsert(newTable.Name, false)
-            );
+            )!;
         }
 
-        public static string GetDefaultValue(ITable table, IColumn column, Replacements rep, bool forNewColumn, string forceDefaultValue = null)
+        public static string GetDefaultValue(ITable table, IColumn column, Replacements rep, bool forNewColumn, string? forceDefaultValue = null)
         {
      		if(column is SystemVersionedInfo.Column svc)
             {
@@ -520,6 +519,8 @@ public static string GetDefaultValue(ITable table, IColumn column, Replacements
                 return $"CONVERT(datetime2, '{date:yyyy-MM-dd HH:mm:ss.fffffff}')";
             }
 
+            column = column!; /*CSBUG*/
+
             string typeDefault = forceDefaultValue ??
                 (SqlBuilder.IsNumber(column.SqlDbType) ? "0" :
                 SqlBuilder.IsString(column.SqlDbType) ? "''" :
@@ -595,7 +596,7 @@ private static Dictionary<string, DiffIndex> ApplyIndexAutoReplacements(DiffTabl
             return diff.Indices.SelectDictionary(on => replacements.TryGetC(on) ?? on, dif => dif);
         }
 
-        private static SqlPreCommandSimple UpdateByFkChange(string tn, DiffColumn difCol, IColumn tabCol, Func<ObjectName, ObjectName> changeName, Dictionary<ObjectName, ObjectName> copyDataFrom)
+        private static SqlPreCommandSimple? UpdateByFkChange(string tn, DiffColumn difCol, IColumn tabCol, Func<ObjectName, ObjectName> changeName, Dictionary<ObjectName, ObjectName> copyDataFrom)
         {
             if (difCol.ForeignKey == null || tabCol.ReferenceTable == null || tabCol.AvoidForeignKey)
                 return null;
@@ -776,7 +777,7 @@ public static SqlDbType ToSqlDbType(string str)
         }
 
 
-        static SqlPreCommand SynchronizeEnumsScript(Replacements replacements)
+        static SqlPreCommand? SynchronizeEnumsScript(Replacements replacements)
         {
             try
             {
@@ -786,7 +787,7 @@ static SqlPreCommand SynchronizeEnumsScript(Replacements replacements)
 
                 foreach (var table in schema.Tables.Values)
                 {
-                    Type enumType = EnumEntity.Extract(table.Type);
+                    Type? enumType = EnumEntity.Extract(table.Type);
                     if (enumType != null)
                     {
                         Console.Write(".");
@@ -795,7 +796,7 @@ static SqlPreCommand SynchronizeEnumsScript(Replacements replacements)
                         Dictionary<string, Entity> shouldByName = should.ToDictionary(a => a.ToString());
 
                         List<Entity> current = Administrator.TryRetrieveAll(table.Type, replacements);
-                        Dictionary<string, Entity> currentByName = current.ToDictionaryEx(a => a.toStr, table.Name.Name);
+                        Dictionary<string, Entity> currentByName = current.ToDictionaryEx(a => a.toStr!, table.Name.Name);
 
                         string key = Replacements.KeyEnumsForTable(table.Name.Name);
 
@@ -803,7 +804,7 @@ static SqlPreCommand SynchronizeEnumsScript(Replacements replacements)
 
                         currentByName = replacements.ApplyReplacementsToOld(currentByName, key);
 
-                        var mix = shouldByName.JoinDictionary(currentByName, (n, s, c) => new { s, c }).Where(a => a.Value.s.id != a.Value.c.id).ToDictionary();
+                        var mix = shouldByName.JoinDictionary(currentByName, (n, s, c) => (s, c)).Where(a => a.Value.s.id != a.Value.c.id).ToDictionary();
 
                         HashSet<PrimaryKey> usedIds = current.Select(a => a.Id).ToHashSet();
 
@@ -888,7 +889,7 @@ private static Entity Clone(Entity current)
             return instance;
         }
 
-        public static SqlPreCommand SnapshotIsolation(Replacements replacements)
+        public static SqlPreCommand? SnapshotIsolation(Replacements replacements)
         {
             if (replacements.SchemaOnly)
                 return null;
@@ -907,9 +908,9 @@ public static SqlPreCommand SnapshotIsolation(Replacements replacements)
 
             var cmd = replacements.WithReplacedDatabaseName().Using(_ => results.Select((a, i) =>
                 SqlPreCommand.Combine(Spacing.Simple,
-                !a.snapshot_isolation_state || !a.is_read_committed_snapshot_on ? DisconnectUsers(a.name, "SPID" + i) : null,
-                !a.snapshot_isolation_state ? SqlBuilder.SetSnapshotIsolation(a.name, true) : null,
-                !a.is_read_committed_snapshot_on ? SqlBuilder.MakeSnapshotIsolationDefault(a.name, true) : null)).Combine(Spacing.Double));
+                !a.snapshot_isolation_state || !a.is_read_committed_snapshot_on ? DisconnectUsers(a.name!/*CSBUG*/, "SPID" + i) : null,
+                !a.snapshot_isolation_state ? SqlBuilder.SetSnapshotIsolation(a.name!/*CSBUG*/, true) : null,
+                !a.is_read_committed_snapshot_on ? SqlBuilder.MakeSnapshotIsolationDefault(a.name!/*CSBUG*/, true) : null)).Combine(Spacing.Double));
 
             if (cmd == null)
                 return null;
@@ -961,8 +962,8 @@ public List<DiffIndex> ViewIndices
         }
 
         public SysTableTemporalType TemporalType;
-        public ObjectName TemporalTableName;
-        public DiffPeriod Period;
+        public ObjectName? TemporalTableName;
+        public DiffPeriod? Period;
 
         public Dictionary<string, DiffIndex> Indices = new Dictionary<string, DiffIndex>();
 
@@ -1102,9 +1103,9 @@ public class DiffColumn
     {
         public string Name;
         public SqlDbType SqlDbType;
-        public string UserTypeName;
+        public string? UserTypeName;
         public bool Nullable;
-        public string Collation;
+        public string? Collation;
         public int Length;
         public int Precision;
         public int Scale;
@@ -1113,7 +1114,7 @@ public class DiffColumn
 
         public DiffForeignKey ForeignKey;
 
-        public DiffDefaultConstraint DefaultConstraint;
+        public DiffDefaultConstraint? DefaultConstraint;
 
         public GeneratedAlwaysType GeneratedAlwaysType;
 
diff --git a/Signum.Engine/Engine/SqlBuilder.cs b/Signum.Engine/Engine/SqlBuilder.cs
index 41b700c807..20dc172dfa 100644
--- a/Signum.Engine/Engine/SqlBuilder.cs
+++ b/Signum.Engine/Engine/SqlBuilder.cs
@@ -57,7 +57,7 @@ public static SqlPreCommand DropTable(DiffTable diffTable)
                 AlterTableDisableSystemVersioning(diffTable.Name),
                 DropTable(diffTable.Name),
                 DropTable(diffTable.TemporalTableName)
-            );
+            )!;
         }
 
         public static SqlPreCommand DropTable(ObjectName tableName)
@@ -75,7 +75,7 @@ static SqlPreCommand DropViewIndex(ObjectName viewName, string index)
             return new[]{
                  DropIndex(viewName, index),
                  DropView(viewName)
-            }.Combine(Spacing.Simple);
+            }.Combine(Spacing.Simple)!;
         }
 
         public static SqlPreCommand AlterTableAddPeriod(ITable table)
@@ -111,7 +111,7 @@ public static SqlPreCommand AlterTableDropColumn(ITable table, string columnName
             return new SqlPreCommandSimple("ALTER TABLE {0} DROP COLUMN {1}".FormatWith(table.Name, columnName.SqlEscape()));
         }
 
-        public static SqlPreCommand AlterTableAddColumn(ITable table, IColumn column, SqlBuilder.DefaultConstraint tempDefault = null)
+        public static SqlPreCommand AlterTableAddColumn(ITable table, IColumn column, SqlBuilder.DefaultConstraint? tempDefault = null)
         {
             return new SqlPreCommandSimple("ALTER TABLE {0} ADD {1}".FormatWith(table.Name, CreateColumn(column, tempDefault ?? GetDefaultConstaint(table, column))));
         }
@@ -163,28 +163,28 @@ public static bool IsDate(SqlDbType sqlDbType)
             return false;
         }
 
-        public static SqlPreCommand AlterTableAlterColumn(ITable table, IColumn column, string defaultConstraintName = null)
+        public static SqlPreCommand AlterTableAlterColumn(ITable table, IColumn column, string? defaultConstraintName = null)
         {
             var alterColumn = new SqlPreCommandSimple("ALTER TABLE {0} ALTER COLUMN {1}".FormatWith(table.Name, CreateColumn(column, null)));
 
             if (column.Default == null)
                 return alterColumn;
 
-            var defCons = GetDefaultConstaint(table, column);
+            var defCons = GetDefaultConstaint(table, column)!;
 
             return SqlPreCommand.Combine(Spacing.Simple,
                 AlterTableDropConstraint(table.Name, defaultConstraintName ?? defCons.Name),
                 alterColumn,
                 AlterTableAddDefaultConstraint(table.Name, defCons)
-            );
+            )!;
         }
 
-        public static DefaultConstraint GetDefaultConstaint(ITable t, IColumn c)
+        public static DefaultConstraint? GetDefaultConstaint(ITable t, IColumn c)
         {
             if (c.Default == null)
                 return null;
 
-            return new DefaultConstraint { ColumnName = c.Name, Name = $"DF_{t.Name.Name}_{c.Name}", QuotedDefinition = Quote(c.SqlDbType, c.Default) };
+            return new DefaultConstraint(c.Name, $"DF_{t.Name.Name}_{c.Name}", Quote(c.SqlDbType, c.Default));
         }
 
         public class DefaultConstraint
@@ -192,10 +192,17 @@ public class DefaultConstraint
             public string ColumnName;
             public string Name;
             public string QuotedDefinition;
+
+            public DefaultConstraint(string columnName, string name, string quotedDefinition)
+            {
+                ColumnName = columnName;
+                Name = name;
+                QuotedDefinition = quotedDefinition;
+            }
         }
 
 
-        public static string CreateColumn(IColumn c, DefaultConstraint constraint)
+        public static string CreateColumn(IColumn c, DefaultConstraint? constraint)
         {
             string fullType = GetColumnType(c);
 
@@ -204,11 +211,12 @@ public static string CreateColumn(IColumn c, DefaultConstraint constraint)
                 null;
 
             var defaultConstraint = constraint != null ? $"CONSTRAINT {constraint.Name} DEFAULT " + constraint.QuotedDefinition : null;
+            c = c!;/*CSBUG*/
 
             return $" ".CombineIfNotEmpty(
                 c.Name.SqlEscape(),
                 fullType,
-                c.Identity ? "IDENTITY " : null,
+                c.Identity ? "IDENTITY " : null, 
                 generatedAlways,
                 c.Collation != null ? ("COLLATE " + c.Collation) : null,
                 c.Nullable.ToBool() ? "NULL" : "NOT NULL",
@@ -243,7 +251,7 @@ public static string GetSizeScale(int? size, int? scale)
             return "({0},{1})".FormatWith(size, scale);
         }
 
-        public static SqlPreCommand AlterTableForeignKeys(ITable t)
+        public static SqlPreCommand? AlterTableForeignKeys(ITable t)
         {
             return t.Columns.Values.Select(c =>
                 (c.ReferenceTable == null || c.AvoidForeignKey) ? null : SqlBuilder.AlterTableAddConstraintForeignKey(t, c.Name, c.ReferenceTable))
@@ -272,7 +280,7 @@ public static SqlPreCommand DropIndex(ObjectName objectName, string indexName)
                     .FormatWith(objectName.Schema.Database.ToString().SqlEscape(), indexName.SqlEscape(), objectName.OnDatabase(null).ToString()));
         }
 
-        public static SqlPreCommand CreateIndex(Index index, Replacements checkUnique)
+        public static SqlPreCommand CreateIndex(Index index, Replacements? checkUnique)
         {
             if (index is PrimaryClusteredIndex)
             {
@@ -294,18 +302,21 @@ public static SqlPreCommand CreateIndex(Index index, Replacements checkUnique)
 
                     SqlPreCommandSimple indexSql = new SqlPreCommandSimple($"CREATE UNIQUE CLUSTERED INDEX {uIndex.IndexName} ON {viewName}({columns})");
 
-                    return SqlPreCommand.Combine(Spacing.Simple, checkUnique!=null ? RemoveDuplicatesIfNecessary(uIndex, checkUnique) : null, viewSql, indexSql);
+                    return SqlPreCommand.Combine(Spacing.Simple, 
+                        checkUnique!=null ? RemoveDuplicatesIfNecessary(uIndex, checkUnique) : null, 
+                        viewSql, 
+                        indexSql)!;
                 }
                 else
                 {
                     return SqlPreCommand.Combine(Spacing.Double,
                         checkUnique != null ? RemoveDuplicatesIfNecessary(uIndex, checkUnique) : null,
-                        CreateIndexBasic(index, false));
+                        CreateIndexBasic(index, false))!;
                 }
             }
             else
             {
-                return CreateIndexBasic(index, forHistoryTable: false);
+                return CreateIndexBasic(index! /*CSBUG*/, forHistoryTable: false);
             }
         }
 
@@ -335,7 +346,7 @@ GROUP BY {oldColumns}
 ){(string.IsNullOrWhiteSpace(uniqueIndex.Where) ? "" : "AND " + uniqueIndex.Where.Replace(columnReplacement))}");
         }
 
-        public static SqlPreCommand RemoveDuplicatesIfNecessary(UniqueIndex uniqueIndex, Replacements rep)
+        public static SqlPreCommand? RemoveDuplicatesIfNecessary(UniqueIndex uniqueIndex, Replacements rep)
         {
             try
             {
@@ -415,12 +426,12 @@ public static SqlPreCommandSimple AlterTableAddDefaultConstraint(ObjectName tabl
             return new SqlPreCommandSimple($"ALTER TABLE {tableName} ADD CONSTRAINT {constraint.Name} DEFAULT {constraint.QuotedDefinition} FOR {constraint.ColumnName}");
         }
 
-        public static SqlPreCommand AlterTableAddConstraintForeignKey(ITable table, string fieldName, ITable foreignTable)
+        public static SqlPreCommand? AlterTableAddConstraintForeignKey(ITable table, string fieldName, ITable foreignTable)
         {
             return AlterTableAddConstraintForeignKey(table.Name, fieldName, foreignTable.Name, foreignTable.PrimaryKey.Name);
         }
 
-        public static SqlPreCommand AlterTableAddConstraintForeignKey(ObjectName parentTable, string parentColumn, ObjectName targetTable, string targetPrimaryKey)
+        public static SqlPreCommand? AlterTableAddConstraintForeignKey(ObjectName parentTable, string parentColumn, ObjectName targetTable, string targetPrimaryKey)
         {
             if (!object.Equals(parentTable.Schema.Database, targetTable.Schema.Database))
                 return null;
@@ -443,7 +454,7 @@ public static SqlPreCommand RenameForeignKey(ObjectName foreignKeyName, string n
             return SP_RENAME(foreignKeyName.Schema.Database, foreignKeyName.OnDatabase(null).ToString(), newName, "OBJECT");
         }
 
-        public static SqlPreCommandSimple SP_RENAME(DatabaseName database, string oldName, string newName, string objectType)
+        public static SqlPreCommandSimple SP_RENAME(DatabaseName? database, string oldName, string newName, string? objectType)
         {
             return new SqlPreCommandSimple("EXEC {0}SP_RENAME '{1}' , '{2}'{3}".FormatWith(
                 database == null ? null: (new SchemaName(database, "dbo").ToString() + "."),
@@ -465,7 +476,7 @@ public static SqlPreCommand RenameOrChangeSchema(ObjectName oldTableName, Object
 
             return SqlPreCommand.Combine(Spacing.Simple,
                 AlterSchema(oldTableName, newTableName.Schema),
-                oldNewSchema.Equals(newTableName) ? null : RenameTable(oldNewSchema, newTableName.Name));
+                oldNewSchema.Equals(newTableName) ? null : RenameTable(oldNewSchema, newTableName.Name))!;
         }
 
         public static SqlPreCommand RenameOrMove(DiffTable oldTable, ITable newTable)
@@ -476,7 +487,7 @@ public static SqlPreCommand RenameOrMove(DiffTable oldTable, ITable newTable)
             return SqlPreCommand.Combine(Spacing.Simple,
               CreateTableSql(newTable),
               MoveRows(oldTable.Name, newTable.Name, newTable.Columns.Keys),
-              DropTable(oldTable));
+              DropTable(oldTable))!;
         }
 
         public static SqlPreCommand MoveRows(ObjectName oldTable, ObjectName newTable, IEnumerable<string> columnNames)
@@ -493,7 +504,7 @@ public static SqlPreCommand MoveRows(ObjectName oldTable, ObjectName newTable, I
             return SqlPreCommand.Combine(Spacing.Simple,
                 new SqlPreCommandSimple("SET IDENTITY_INSERT {0} ON".FormatWith(newTable)) { GoBefore = true },
                 command,
-                new SqlPreCommandSimple("SET IDENTITY_INSERT {0} OFF".FormatWith(newTable)) { GoAfter = true });
+                new SqlPreCommandSimple("SET IDENTITY_INSERT {0} OFF".FormatWith(newTable)) { GoAfter = true })!;
         }
 
         public static SqlPreCommand RenameTable(ObjectName oldName, string newName)
@@ -583,7 +594,7 @@ public static SqlPreCommandSimple RebuildIndex(ObjectName tableName, string inde
 
         public static SqlPreCommandSimple DropPrimaryKeyConstraint(ObjectName tableName)
         {
-            DatabaseName db = tableName.Schema.Database;
+            DatabaseName? db = tableName.Schema.Database;
 
             var tn = tableName.OnDatabase(null);
 
@@ -604,7 +615,7 @@ EXEC DB.dbo.sp_executesql @sql"
         }
 
 
-        internal static SqlPreCommand DropStatistics(string tn, List<DiffStats> list)
+        internal static SqlPreCommand? DropStatistics(string tn, List<DiffStats> list)
         {
             if (list.IsEmpty())
                 return null;
diff --git a/Signum.Engine/Engine/SqlPreCommand.cs b/Signum.Engine/Engine/SqlPreCommand.cs
index cc688fcf9d..a4953cedd9 100644
--- a/Signum.Engine/Engine/SqlPreCommand.cs
+++ b/Signum.Engine/Engine/SqlPreCommand.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -52,7 +52,7 @@ public override string ToString()
             return this.PlainSql();
         }
 
-        public static SqlPreCommand Combine(Spacing spacing, params SqlPreCommand[] sentences)
+        public static SqlPreCommand? Combine(Spacing spacing, params SqlPreCommand?[] sentences)
         {
             if (sentences.Contains(null))
                 sentences = sentences.NotNull().ToArray();
@@ -63,7 +63,7 @@ public static SqlPreCommand Combine(Spacing spacing, params SqlPreCommand[] sent
             if (sentences.Length == 1)
                 return sentences[0];
 
-            return new SqlPreCommandConcat(spacing, sentences);
+            return new SqlPreCommandConcat(spacing, sentences as SqlPreCommand[]);
         }
 
 
@@ -71,19 +71,16 @@ public static SqlPreCommand Combine(Spacing spacing, params SqlPreCommand[] sent
 
     public static class SqlPreCommandExtensions
     {
-        public static SqlPreCommand Combine(this IEnumerable<SqlPreCommand> preCommands, Spacing spacing)
+        public static SqlPreCommand? Combine(this IEnumerable<SqlPreCommand?> preCommands, Spacing spacing)
         {
             return SqlPreCommand.Combine(spacing, preCommands.ToArray());
         }
 
         public static SqlPreCommand PlainSqlCommand(this SqlPreCommand command)
         {
-            if (command == null)
-                return null;
-
             return command.PlainSql().SplitNoEmpty("GO\r\n" )
                 .Select(s => new SqlPreCommandSimple(s))
-                .Combine(Spacing.Simple);
+                .Combine(Spacing.Simple)!;
         }
 
         public static bool AvoidOpenOpenSqlFileRetry = true;
@@ -132,14 +129,14 @@ public class SqlPreCommandSimple : SqlPreCommand
         public override bool GoAfter { get; set; }
 
         public string Sql { get; private set; }
-        public List<DbParameter> Parameters { get; private set; }
+        public List<DbParameter>? Parameters { get; private set; }
 
         public SqlPreCommandSimple(string sql)
         {
             this.Sql = sql;
         }
 
-        public SqlPreCommandSimple(string sql, List<DbParameter> parameters)
+        public SqlPreCommandSimple(string sql, List<DbParameter>? parameters)
         {
             this.Sql = sql;
             this.Parameters = parameters;
@@ -182,16 +179,16 @@ internal static string Encode(object value)
             if (value is bool b)
                 return (b ? 1 : 0).ToString();
 
-            if (Schema.Current.Settings.UdtSqlName.TryGetValue(value.GetType(), out var name))
+            if (Schema.Current.Settings.UdtSqlName.TryGetValue(value!.GetType() /*CSBUG*/, out var name))
                 return "CAST('{0}' AS {1})".FormatWith(value, name);
 
-            if (value.GetType().IsEnum)
+            if (value!.GetType().IsEnum /*CSBUG*/)
                 return Convert.ToInt32(value).ToString();
 
             if (value is byte[] bytes)
                 return "0x" + BitConverter.ToString(bytes).Replace("-", "");
 
-            return value.ToString();
+            return value!.ToString(); /*CSBUG*/
         }
 
         protected internal override void PlainSql(StringBuilder sb)
@@ -218,11 +215,10 @@ public string sp_executesql()
 
         public override SqlPreCommand Clone()
         {
-            return new SqlPreCommandSimple(Sql, Parameters?.Select(p => Connector.Current.CloneParameter(p))
-                .ToList());
+            return new SqlPreCommandSimple(Sql, Parameters?.Select(p => Connector.Current.CloneParameter(p)).ToList());
         }
 
-        public SqlPreCommandSimple AddComment(string comment)
+        public SqlPreCommandSimple AddComment(string? comment)
         {
             if (comment.HasText())
             {
@@ -236,14 +232,14 @@ public SqlPreCommandSimple AddComment(string comment)
             return this;
         }
 
-        public SqlPreCommandSimple ReplaceFirstParameter(string variableName)
+        public SqlPreCommandSimple ReplaceFirstParameter(string? variableName)
         {
             if (variableName == null)
                 return this;
 
-            var first = Parameters.FirstEx();
+            var first = Parameters!.FirstEx();
             Sql = Regex.Replace(Sql, $@"(?<toReplace>{first.ParameterName})(\b|$)", variableName); //HACK
-            Parameters.Remove(first);
+            Parameters!.Remove(first);
             return this;
         }
     }
diff --git a/Signum.Engine/Engine/Synchronizer.cs b/Signum.Engine/Engine/Synchronizer.cs
index 111b32d6da..e16993c802 100644
--- a/Signum.Engine/Engine/Synchronizer.cs
+++ b/Signum.Engine/Engine/Synchronizer.cs
@@ -11,9 +11,10 @@ public static class Synchronizer
         public static void Synchronize<K, N, O>(
           Dictionary<K, N> newDictionary,
           Dictionary<K, O> oldDictionary,
-          Action<K, N> createNew,
-          Action<K, O> removeOld,
-          Action<K, N, O> merge)
+          Action<K, N>? createNew,
+          Action<K, O>? removeOld,
+          Action<K, N, O>? merge)
+            where K : object
         {
             HashSet<K> keys = new HashSet<K>();
             keys.UnionWith(oldDictionary.Keys);
@@ -42,11 +43,12 @@ public static void Synchronize<K, N, O>(
         public static void SynchronizeProgressForeach<K, N, O>(
           Dictionary<K, N> newDictionary,
           Dictionary<K, O> oldDictionary,
-          Action<K, N> createNew,
-          Action<K, O> removeOld,
-          Action<K, N, O> merge,
+          Action<K, N>? createNew,
+          Action<K, O>? removeOld,
+          Action<K, N, O>? merge,
           bool showProgress = true,
           bool transactional = true)
+            where K : object
         {
             HashSet<K> keys = new HashSet<K>();
             keys.UnionWith(oldDictionary.Keys);
@@ -77,9 +79,9 @@ public static void SynchronizeReplacing<N, O>(
           string replacementsKey,
           Dictionary<string, N> newDictionary,
           Dictionary<string, O> oldDictionary,
-          Action<string, N> createNew,
-          Action<string, O> removeOld,
-          Action<string, N, O> merge)
+          Action<string, N>? createNew,
+          Action<string, O>? removeOld,
+          Action<string, N, O>? merge)
         {
             replacements.AskForReplacements(
                 oldDictionary.Keys.ToHashSet(),
@@ -109,20 +111,21 @@ public static void SynchronizeReplacing<N, O>(
             }
         }
 
-        public static SqlPreCommand SynchronizeScript<K, N, O>(
+        public static SqlPreCommand? SynchronizeScript<K, N, O>(
             Spacing spacing,
             Dictionary<K, N> newDictionary,
             Dictionary<K, O> oldDictionary,
-            Func<K, N, SqlPreCommand> createNew,
-            Func<K, O, SqlPreCommand> removeOld,
-            Func<K, N, O, SqlPreCommand> mergeBoth)
+            Func<K, N, SqlPreCommand?>? createNew,
+            Func<K, O, SqlPreCommand?>? removeOld,
+            Func<K, N, O, SqlPreCommand?>? mergeBoth)
             where O : class
             where N : class
+            where K : object
         {
             return newDictionary.OuterJoinDictionaryCC(oldDictionary, (key, newVal, oldVal) =>
             {
                 if (newVal == null)
-                    return removeOld == null ? null : removeOld(key, oldVal);
+                    return removeOld == null ? null : removeOld(key, oldVal!);
 
                 if (oldVal == null)
                     return createNew == null ? null : createNew(key, newVal);
@@ -133,15 +136,15 @@ public static SqlPreCommand SynchronizeScript<K, N, O>(
 
 
 
-        public static SqlPreCommand SynchronizeScriptReplacing<N, O>(
+        public static SqlPreCommand? SynchronizeScriptReplacing<N, O>(
             Replacements replacements,
             string replacementsKey,
             Spacing spacing,
             Dictionary<string, N> newDictionary,
             Dictionary<string, O> oldDictionary,
-            Func<string, N, SqlPreCommand> createNew,
-            Func<string, O, SqlPreCommand> removeOld,
-            Func<string, N, O, SqlPreCommand> mergeBoth)
+            Func<string, N, SqlPreCommand?>? createNew,
+            Func<string, O, SqlPreCommand?>? removeOld,
+            Func<string, N, O, SqlPreCommand?>? mergeBoth)
             where O : class
             where N : class
         {
@@ -154,9 +157,9 @@ public static SqlPreCommand SynchronizeScriptReplacing<N, O>(
             return SynchronizeScript(spacing, newDictionary, repOldDictionary, createNew, removeOld, mergeBoth);
         }
 
-        public static IDisposable RenameTable(Table table, Replacements replacements)
+        public static IDisposable? RenameTable(Table table, Replacements replacements)
         {
-            string fullName = replacements.TryGetC(Replacements.KeyTablesInverse)?.TryGetC(table.Name.ToString());
+            string? fullName = replacements.TryGetC(Replacements.KeyTablesInverse)?.TryGetC(table.Name.ToString());
             if (fullName == null)
                 return null;
 
@@ -184,9 +187,9 @@ public static string KeyEnumsForTable(string tableName)
 
         public bool Interactive = true;
         public bool SchemaOnly = false;
-        public string ReplaceDatabaseName = null;
+        public string? ReplaceDatabaseName = null;
 
-        public IDisposable WithReplacedDatabaseName()
+        public IDisposable? WithReplacedDatabaseName()
         {
             if (ReplaceDatabaseName == null)
                 return null;
@@ -196,7 +199,7 @@ public IDisposable WithReplacedDatabaseName()
 
         public string Apply(string replacementsKey, string textToReplace)
         {
-            Dictionary<string, string> repDic = this.TryGetC(replacementsKey);
+            Dictionary<string, string>? repDic = this.TryGetC(replacementsKey);
 
             return repDic?.TryGetC(textToReplace) ?? textToReplace;
         }
@@ -286,7 +289,7 @@ static float Distance(StringDistance sd, string o, string n)
             return sd.LevenshteinDistance(o, n, weight: c => c.Type == StringDistance.ChoiceType.Substitute ? 2 : 1);
         }
 
-        public string SelectInteractive(string oldValue, ICollection<string> newValues, string replacementsKey, StringDistance sd)
+        public string? SelectInteractive(string oldValue, ICollection<string> newValues, string replacementsKey, StringDistance sd)
         {
             if (newValues.Contains(oldValue))
                 return oldValue;
@@ -313,6 +316,13 @@ public class AutoReplacementContext
             public string ReplacementKey;
             public string OldValue;
             public List<string> NewValues;
+
+            public AutoReplacementContext(string replacementKey, string oldValue, List<string> newValues)
+            {
+                ReplacementKey = replacementKey;
+                OldValue = oldValue;
+                NewValues = newValues;
+            }
         }
 
         public static Func<AutoReplacementContext, Selection?> AutoReplacement;
@@ -321,12 +331,7 @@ private static Selection SelectInteractive(string oldValue, List<string> newValu
         {
             if (AutoReplacement != null)
             {
-                Selection? selection = AutoReplacement(new AutoReplacementContext
-                {
-                    ReplacementKey = replacementsKey,
-                    OldValue = oldValue,
-                    NewValues = newValues
-                });
+                Selection? selection = AutoReplacement(new AutoReplacementContext(replacementsKey, oldValue, newValues));
                 if (selection != null)
                 {
                     SafeConsole.WriteLineColor(ConsoleColor.DarkGray, "AutoReplacement:");
@@ -396,14 +401,15 @@ private static Selection SelectInteractive(string oldValue, List<string> newValu
 
         public struct Selection
         {
-            public Selection(string oldValue, string newValue)
+            /// <param name="newValue">Null for removed</param>
+            public Selection(string oldValue, string? newValue)
             {
                 this.OldValue = oldValue;
                 this.NewValue = newValue;
             }
 
             public readonly string OldValue;
-            public readonly string NewValue;
+            public readonly string? NewValue;
         }
 
     }
diff --git a/Signum.Engine/Linq/DbExpressions.Signum.cs b/Signum.Engine/Linq/DbExpressions.Signum.cs
index 9422eb8fad..8325c6749d 100644
--- a/Signum.Engine/Linq/DbExpressions.Signum.cs
+++ b/Signum.Engine/Linq/DbExpressions.Signum.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -22,19 +22,24 @@ internal class EntityExpression : DbExpression
 
         public readonly Table Table;
         public readonly PrimaryKeyExpression ExternalId;
-        public readonly NewExpression ExternalPeriod;
+        public readonly NewExpression? ExternalPeriod;
 
         //Optional
-        public readonly Alias TableAlias;
-        public readonly ReadOnlyCollection<FieldBinding> Bindings;
-        public readonly ReadOnlyCollection<MixinEntityExpression> Mixins;
+        public readonly Alias? TableAlias;
+        public readonly ReadOnlyCollection<FieldBinding>? Bindings;
+        public readonly ReadOnlyCollection<MixinEntityExpression>? Mixins;
 
         public readonly bool AvoidExpandOnRetrieving;
 
-        public readonly NewExpression TablePeriod;
+        public readonly NewExpression? TablePeriod;
 
 
-        public EntityExpression(Type type, PrimaryKeyExpression externalId, NewExpression externalPeriod, Alias tableAlias, IEnumerable<FieldBinding> bindings, IEnumerable<MixinEntityExpression> mixins, NewExpression tablePeriod, bool avoidExpandOnRetrieving)
+        public EntityExpression(Type type, PrimaryKeyExpression externalId, 
+            NewExpression? externalPeriod, 
+            Alias? tableAlias, 
+            IEnumerable<FieldBinding>? bindings, 
+            IEnumerable<MixinEntityExpression>? mixins, 
+            NewExpression? tablePeriod, bool avoidExpandOnRetrieving)
             : base(DbExpressionType.Entity, type)
         {
             if (type == null)
@@ -101,10 +106,10 @@ internal class EmbeddedEntityExpression : DbExpression
 
         public readonly ReadOnlyCollection<FieldBinding> Bindings;
 
-        public readonly FieldEmbedded FieldEmbedded; //used for updates
-        public readonly Table ViewTable; //used for updates
+        public readonly FieldEmbedded? FieldEmbedded; //used for updates
+        public readonly Table? ViewTable; //used for updates
 
-        public EmbeddedEntityExpression(Type type, Expression hasValue, IEnumerable<FieldBinding> bindings, FieldEmbedded fieldEmbedded, Table viewTable)
+        public EmbeddedEntityExpression(Type type, Expression hasValue, IEnumerable<FieldBinding> bindings, FieldEmbedded? fieldEmbedded, Table? viewTable)
             : base(DbExpressionType.EmbeddedInit, type)
         {
             if (bindings == null)
@@ -144,7 +149,7 @@ protected override Expression Accept(DbExpressionVisitor visitor)
 
         public Expression GetViewId()
         {
-            var field = ViewTable.GetViewPrimaryKey();
+            var field = ViewTable!.GetViewPrimaryKey();
 
             return this.Bindings.SingleEx(b => ReflectionTools.FieldEquals(b.FieldInfo, field.FieldInfo)).Binding;
         }
@@ -154,11 +159,11 @@ internal class MixinEntityExpression : DbExpression
     {
         public readonly ReadOnlyCollection<FieldBinding> Bindings;
 
-        public readonly FieldMixin FieldMixin; //used for updates
+        public readonly FieldMixin? FieldMixin; //used for updates
 
-        public readonly Alias MainEntityAlias;
+        public readonly Alias? MainEntityAlias;
 
-        public MixinEntityExpression(Type type, IEnumerable<FieldBinding> bindings, Alias mainEntityAlias, FieldMixin fieldMixin)
+        public MixinEntityExpression(Type type, IEnumerable<FieldBinding> bindings, Alias? mainEntityAlias, FieldMixin? fieldMixin)
             : base(DbExpressionType.MixinInit, type)
         {
             if (bindings == null)
@@ -249,10 +254,10 @@ internal class ImplementedByAllExpression : DbExpression
     {
         public readonly Expression Id;
         public readonly TypeImplementedByAllExpression TypeId;
-        public readonly NewExpression ExternalPeriod;
+        public readonly NewExpression? ExternalPeriod;
 
 
-        public ImplementedByAllExpression(Type type, Expression id, TypeImplementedByAllExpression typeId, NewExpression externalPeriod)
+        public ImplementedByAllExpression(Type type, Expression id, TypeImplementedByAllExpression typeId, NewExpression? externalPeriod)
             : base(DbExpressionType.ImplementedByAll, type)
         {
             if (id == null)
@@ -281,12 +286,12 @@ internal class LiteReferenceExpression : DbExpression
         public bool LazyToStr;
         public bool EagerEntity;
         public readonly Expression Reference; //Fie, ImplementedBy, ImplementedByAll or Constant to NullEntityExpression
-        public readonly Expression CustomToStr; //Not readonly
+        public readonly Expression? CustomToStr; //Not readonly
 
-        public LiteReferenceExpression(Type type, Expression reference, Expression customToStr, bool lazyToStr, bool eagerEntity) :
+        public LiteReferenceExpression(Type type, Expression reference, Expression? customToStr, bool lazyToStr, bool eagerEntity) :
             base(DbExpressionType.LiteReference, type)
         {
-            Type cleanType = Lite.Extract(type);
+            Type? cleanType = Lite.Extract(type);
 
             if (cleanType != reference.Type)
                 throw new ArgumentException("The type {0} is not the Lite version of {1}".FormatWith(type.TypeName(), reference.Type.TypeName()));
diff --git a/Signum.Engine/Linq/DbExpressions.Sql.cs b/Signum.Engine/Linq/DbExpressions.Sql.cs
index 49857bd169..bddce390db 100644
--- a/Signum.Engine/Linq/DbExpressions.Sql.cs
+++ b/Signum.Engine/Linq/DbExpressions.Sql.cs
@@ -177,18 +177,18 @@ internal class TableExpression : SourceWithAliasExpression
     {
         public readonly ITable Table;
 
-        public ObjectName Name { get { return SystemTime is SystemTime.HistoryTable ? Table.SystemVersioned.TableName : Table.Name; } }
+        public ObjectName Name { get { return SystemTime is SystemTime.HistoryTable ? Table.SystemVersioned!.TableName : Table.Name; } }
 
-        public SystemTime SystemTime { get; private set; }
+        public SystemTime? SystemTime { get; private set; }
 
-        public readonly string WithHint;
+        public readonly string? WithHint;
 
         public override Alias[] KnownAliases
         {
             get { return new[] { Alias }; }
         }
 
-        internal TableExpression(Alias alias, ITable table, SystemTime systemTime, string withHint)
+        internal TableExpression(Alias alias, ITable table, SystemTime? systemTime, string? withHint)
             : base(DbExpressionType.Table, alias)
         {
             this.Table = table;
@@ -239,11 +239,7 @@ public override string ToString()
             return "{0}.{1}".FormatWith(Alias, Name);
         }
 
-        public override bool Equals(object obj)
-        {
-            return Equals(obj as ColumnExpression);
-        }
-
+        public override bool Equals(object obj) => obj is ColumnExpression ce && Equals(ce);
         public bool Equals(ColumnExpression other)
         {
             return other != null && other.Alias == Alias && other.Name == Name;
@@ -365,11 +361,11 @@ internal enum SelectOptions
     internal class SelectExpression : SourceWithAliasExpression
     {
         public readonly ReadOnlyCollection<ColumnDeclaration> Columns;
-        public readonly SourceExpression From;
-        public readonly Expression Where;
+        public readonly SourceExpression? From;
+        public readonly Expression? Where;
         public readonly ReadOnlyCollection<OrderExpression> OrderBy;
         public readonly ReadOnlyCollection<Expression> GroupBy;
-        public readonly Expression Top;
+        public readonly Expression? Top;
         public readonly bool IsDistinct;
         public readonly SelectOptions SelectOptions;
 
@@ -400,7 +396,7 @@ public override Alias[] KnownAliases
             get { return knownAliases; }
         }
 
-        internal SelectExpression(Alias alias, bool distinct, Expression top, IEnumerable<ColumnDeclaration> columns, SourceExpression from, Expression where, IEnumerable<OrderExpression> orderBy, IEnumerable<Expression> groupBy, SelectOptions options)
+        internal SelectExpression(Alias alias, bool distinct, Expression? top, IEnumerable<ColumnDeclaration>? columns, SourceExpression? from, Expression? where, IEnumerable<OrderExpression>? orderBy, IEnumerable<Expression>? groupBy, SelectOptions options)
             : base(DbExpressionType.Select, alias)
         {
             this.IsDistinct = distinct;
@@ -492,14 +488,14 @@ internal class JoinExpression : SourceExpression
         public readonly JoinType JoinType;
         public readonly SourceExpression Left;
         public readonly SourceExpression Right;
-        public new readonly Expression Condition;
+        public new readonly Expression? Condition;
 
         public override Alias[] KnownAliases
         {
             get { return Left.KnownAliases.Concat(Right.KnownAliases).ToArray(); }
         }
 
-        internal JoinExpression(JoinType joinType, SourceExpression left, SourceExpression right, Expression condition)
+        internal JoinExpression(JoinType joinType, SourceExpression left, SourceExpression right, Expression? condition)
             : base(DbExpressionType.Join)
         {
             if (condition == null && joinType != JoinType.CrossApply && joinType != JoinType.OuterApply && joinType != JoinType.CrossJoin)
@@ -716,11 +712,11 @@ protected override Expression Accept(DbExpressionVisitor visitor)
 
     internal class SqlFunctionExpression : DbExpression
     {
-        public readonly Expression Object;
+        public readonly Expression? Object;
         public readonly string SqlFunction;
         public readonly ReadOnlyCollection<Expression> Arguments;
 
-        public SqlFunctionExpression(Type type, Expression obj, string sqlFunction, IEnumerable<Expression> arguments)
+        public SqlFunctionExpression(Type type, Expression? obj, string sqlFunction, IEnumerable<Expression> arguments)
             : base(DbExpressionType.SqlFunction, type)
         {
             this.SqlFunction = sqlFunction;
@@ -744,14 +740,14 @@ protected override Expression Accept(DbExpressionVisitor visitor)
 
     internal class SqlConstantExpression : DbExpression
     {
-        public readonly object Value;
+        public readonly object? Value;
 
         public SqlConstantExpression(object value)
             : this(value, value.GetType())
         {
         }
 
-        public SqlConstantExpression(object value, Type type)
+        public SqlConstantExpression(object? value, Type type)
             : base(DbExpressionType.SqlConstant, type)
         {
             this.Value = value;
@@ -853,10 +849,9 @@ public static Expression NotEqualsNulll(this Expression exp)
     internal class CaseExpression : DbExpression
     {
         public readonly ReadOnlyCollection<When> Whens;
-        public readonly Expression DefaultValue;
-
-
-        public CaseExpression(IEnumerable<When> whens, Expression defaultValue)
+        public readonly Expression? DefaultValue;
+        
+        public CaseExpression(IEnumerable<When> whens, Expression? defaultValue)
             : base(DbExpressionType.Case, GetType(whens, defaultValue))
         {
             if (whens.IsEmpty())
@@ -871,7 +866,7 @@ public CaseExpression(IEnumerable<When> whens, Expression defaultValue)
             this.DefaultValue = defaultValue;
         }
 
-        static Type GetType(IEnumerable<When> whens, Expression defaultValue)
+        static Type GetType(IEnumerable<When> whens, Expression? defaultValue)
         {
             var types = whens.Select(w => w.Value.Type).ToList();
             if (defaultValue != null)
@@ -933,8 +928,8 @@ protected override Expression Accept(DbExpressionVisitor visitor)
 
     internal abstract class SubqueryExpression : DbExpression
     {
-        public readonly SelectExpression Select;
-        protected SubqueryExpression(DbExpressionType nodeType, Type type, SelectExpression select)
+        public readonly SelectExpression? Select;
+        protected SubqueryExpression(DbExpressionType nodeType, Type type, SelectExpression? select)
             : base(nodeType, type)
         {
             System.Diagnostics.Debug.Assert(nodeType == DbExpressionType.Scalar || nodeType == DbExpressionType.Exists || nodeType == DbExpressionType.In);
@@ -951,7 +946,7 @@ public ScalarExpression(Type type, SelectExpression select)
 
         public override string ToString()
         {
-            return "SCALAR({0})".FormatWith(Select.ToString());
+            return "SCALAR({0})".FormatWith(Select!.ToString());
         }
 
         protected override Expression Accept(DbExpressionVisitor visitor)
@@ -1011,7 +1006,7 @@ public ExistsExpression(SelectExpression select)
 
         public override string ToString()
         {
-            return "EXIST({0})".FormatWith(Select.ToString());
+            return "EXIST({0})".FormatWith(Select!.ToString());
         }
 
         protected override Expression Accept(DbExpressionVisitor visitor)
@@ -1023,7 +1018,7 @@ protected override Expression Accept(DbExpressionVisitor visitor)
     internal class InExpression : SubqueryExpression
     {
         public readonly Expression Expression;
-        public readonly object[] Values;
+        public readonly object[]? Values;
 
         public InExpression(Expression expression, SelectExpression select)
             : base(DbExpressionType.In, typeof(bool), select)
@@ -1054,7 +1049,7 @@ public static Expression FromValues(Expression expression, object[] values)
         public override string ToString()
         {
             if (Values == null)
-                return "{0} IN ({1})".FormatWith(Expression.ToString(), Select.ToString());
+                return "{0} IN ({1})".FormatWith(Expression.ToString(), Select!.ToString());
             else
                 return "{0} IN ({1})".FormatWith(Expression.ToString(), Values.ToString(", "));
         }
@@ -1089,9 +1084,9 @@ protected override Expression Accept(DbExpressionVisitor visitor)
 
     internal class RowNumberExpression : DbExpression
     {
-        public readonly ReadOnlyCollection<OrderExpression> OrderBy;
+        public readonly ReadOnlyCollection<OrderExpression>? OrderBy;
 
-        public RowNumberExpression(IEnumerable<OrderExpression> orderBy)
+        public RowNumberExpression(IEnumerable<OrderExpression>? orderBy)
             : base(DbExpressionType.RowNumber, typeof(int))
         {
             this.OrderBy = orderBy.ToReadOnly();
@@ -1193,7 +1188,7 @@ internal class DeleteExpression : CommandExpression
     {
         public readonly ITable Table;
         public readonly bool UseHistoryTable;
-        public ObjectName Name { get { return UseHistoryTable ? Table.SystemVersioned.TableName : Table.Name; } }
+        public ObjectName Name { get { return UseHistoryTable ? Table.SystemVersioned!.TableName : Table.Name; } }
 
         public readonly SourceWithAliasExpression Source;
         public readonly Expression Where;
@@ -1225,7 +1220,7 @@ internal class UpdateExpression : CommandExpression
     {
         public readonly ITable Table;
         public readonly bool UseHistoryTable;
-        public ObjectName Name { get { return UseHistoryTable ? Table.SystemVersioned.TableName : Table.Name; } }
+        public ObjectName Name { get { return UseHistoryTable ? Table.SystemVersioned!.TableName : Table.Name; } }
 
         public readonly ReadOnlyCollection<ColumnAssignment> Assigments;
         public readonly SourceWithAliasExpression Source;
@@ -1260,7 +1255,7 @@ internal class InsertSelectExpression : CommandExpression
     {
         public readonly ITable Table;
         public readonly bool UseHistoryTable;
-        public ObjectName Name { get { return UseHistoryTable ? Table.SystemVersioned.TableName : Table.Name; } }
+        public ObjectName Name { get { return UseHistoryTable ? Table.SystemVersioned!.TableName : Table.Name; } }
         public readonly ReadOnlyCollection<ColumnAssignment> Assigments;
         public readonly SourceWithAliasExpression Source;
 
diff --git a/Signum.Engine/Linq/DbQueryProvider.cs b/Signum.Engine/Linq/DbQueryProvider.cs
index f7008a827b..5352d43af0 100644
--- a/Signum.Engine/Linq/DbQueryProvider.cs
+++ b/Signum.Engine/Linq/DbQueryProvider.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using System.Linq.Expressions;
 using Signum.Utilities;
@@ -57,7 +57,7 @@ internal R Translate<R>(Expression expression, Func<ITranslateResult, R> continu
             using (HeavyProfiler.Log("LINQ", () => expression.ToString()))
             using (var log = HeavyProfiler.LogNoStackTrace("Clean"))
             {
-                Expression cleaned = Clean(expression, true, log);
+                Expression cleaned = Clean(expression, true, log)!;
                 var binder = new QueryBinder(aliasGenerator);
                 log.Switch("Bind");
                 ProjectionExpression binded = (ProjectionExpression)binder.BindQuery(cleaned);
@@ -71,17 +71,17 @@ internal R Translate<R>(Expression expression, Func<ITranslateResult, R> continu
 
         }
 
-        public static Expression Clean(Expression expression, bool filter, HeavyProfiler.Tracer log)
+        public static Expression? Clean(Expression? expression, bool filter, HeavyProfiler.Tracer? log)
         {
-            Expression clean = ExpressionCleaner.Clean(expression);
+            Expression? clean = ExpressionCleaner.Clean(expression);
             log.Switch("OvrLdSmp");
-            Expression simplified = OverloadingSimplifier.Simplify(clean);
+            Expression? simplified = OverloadingSimplifier.Simplify(clean);
             log.Switch("QrFlr");
-            Expression filtered = QueryFilterer.Filter(simplified, filter);
+            Expression? filtered = QueryFilterer.Filter(simplified, filter);
             return filtered;
         }
 
-        internal static Expression Optimize(Expression binded, QueryBinder binder, AliasGenerator aliasGenerator, HeavyProfiler.Tracer log)
+        internal static Expression Optimize(Expression binded, QueryBinder binder, AliasGenerator aliasGenerator, HeavyProfiler.Tracer? log)
         {
             log.Switch("Aggregate");
             Expression rewrited = AggregateRewriter.Rewrite(binded);
@@ -112,7 +112,7 @@ internal R Delete<R>(IQueryable query, Func<SqlPreCommandSimple, R> continuation
             using (HeavyProfiler.Log("LINQ"))
             using (var log = HeavyProfiler.LogNoStackTrace("Clean"))
             {
-                Expression cleaned = Clean(query.Expression, true, log);
+                Expression cleaned = Clean(query.Expression, true, log)!;
 
                 log.Switch("Bind");
                 var binder = new QueryBinder(aliasGenerator);
@@ -133,7 +133,7 @@ internal R Update<R>(IUpdateable updateable, Func<SqlPreCommandSimple, R> contin
             using (HeavyProfiler.Log("LINQ"))
             using (var log = HeavyProfiler.LogNoStackTrace("Clean"))
             {
-                Expression cleaned = Clean(updateable.Query.Expression, true, log);
+                Expression cleaned = Clean(updateable.Query.Expression, true, log)!;
 
                 var binder = new QueryBinder(aliasGenerator);
                 log.Switch("Bind");
@@ -154,7 +154,7 @@ internal R Insert<R>(IQueryable query, LambdaExpression constructor, ITable tabl
             using (HeavyProfiler.Log("LINQ"))
             using (var log = HeavyProfiler.LogNoStackTrace("Clean"))
             {
-                Expression cleaned = Clean(query.Expression, true, log);
+                Expression cleaned = Clean(query.Expression, true, log)!;
                 var binder = new QueryBinder(aliasGenerator);
                 log.Switch("Bind");
                 CommandExpression insert = binder.BindInsert(cleaned, constructor, table);
diff --git a/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs b/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs
index af25aac84a..cb84a3187d 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -13,11 +13,11 @@ namespace Signum.Engine.Linq
 {
     internal class ChildProjectionFlattener : DbExpressionVisitor
     {
-        SelectExpression currentSource;
+        SelectExpression? currentSource;
         AliasGenerator aliasGenerator;
         private ChildProjectionFlattener(){}
 
-        public Type inMList = null;
+        public Type? inMList = null;
 
         protected internal override Expression VisitMListProjection(MListProjectionExpression mlp)
         {
@@ -335,4 +335,4 @@ protected internal override Expression VisitColumn(ColumnExpression column)
         }
 
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionComparer.cs b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionComparer.cs
index c37030c2c5..629d0f0528 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionComparer.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionComparer.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities.ExpressionTrees;
@@ -14,7 +14,7 @@ namespace Signum.Engine.Linq
     /// </summary>
     internal class DbExpressionComparer : ExpressionComparer
     {
-        ScopedDictionary<Alias, Alias> aliasMap;
+        ScopedDictionary<Alias, Alias>? aliasMap;
 
         protected IDisposable AliasScope()
         {
@@ -23,13 +23,13 @@ protected IDisposable AliasScope()
             return new Disposable(() => aliasMap = saved);
         }
 
-        protected DbExpressionComparer(ScopedDictionary<ParameterExpression, ParameterExpression> parameterScope, ScopedDictionary<Alias, Alias> aliasScope, bool checkParameterNames)
+        protected DbExpressionComparer(ScopedDictionary<ParameterExpression, ParameterExpression>? parameterScope, ScopedDictionary<Alias, Alias>? aliasScope, bool checkParameterNames)
             : base(parameterScope, checkParameterNames)
         {
             this.aliasMap = aliasScope;
         }
 
-        public static bool AreEqual(Expression a, Expression b, ScopedDictionary<ParameterExpression, ParameterExpression> parameterScope = null, ScopedDictionary<Alias, Alias> aliasScope = null, bool checkParameterNames = false)
+        public static bool AreEqual(Expression a, Expression b, ScopedDictionary<ParameterExpression, ParameterExpression>? parameterScope = null, ScopedDictionary<Alias, Alias>? aliasScope = null, bool checkParameterNames = false)
         {
             return new DbExpressionComparer(parameterScope, aliasScope, checkParameterNames ).Compare(a, b);
         }
@@ -195,7 +195,7 @@ protected virtual void MapAliases(SourceExpression sourceA, SourceExpression sou
         {
             for (int i = 0, n = sourceA.KnownAliases.Length; i < n; i++)
             {
-                aliasMap.Add(sourceA.KnownAliases[i], sourceB.KnownAliases[i]);
+                aliasMap!.Add(sourceA.KnownAliases[i], sourceB.KnownAliases[i]);
             }
         }
 
diff --git a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
index 4b13001506..1953166715 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
@@ -32,14 +32,17 @@ internal class DbExpressionNominator : DbExpressionVisitor
 
         bool isGroupKey = false;
 
-        Expression isNotNullRoot;
+        Expression? isNotNullRoot;
 
         bool innerProjection = false;
 
         HashSet<Expression> candidates = new HashSet<Expression>();
 
-        T Add<T>(T expression) where T : Expression
+        T Add<T>(T expression) where T : Expression?
         {
+            if (expression == null)
+                return null;
+
             this.candidates.Add(expression);
             return expression;
         }
@@ -51,33 +54,33 @@ bool Has(Expression expression)
 
         private DbExpressionNominator() { }
 
-        static internal HashSet<Expression> Nominate(Expression expression, out Expression newExpression, bool isGroupKey = false)
+        static internal HashSet<Expression> Nominate(Expression? expression, out Expression newExpression, bool isGroupKey = false)
         {
             DbExpressionNominator n = new DbExpressionNominator { isFullNominate = false, isGroupKey = isGroupKey };
-            newExpression = n.Visit(expression);
+            newExpression = n.Visit(expression)!;
             return n.candidates;
         }
 
-        static internal Expression FullNominate(Expression expression)
+        static internal Expression? FullNominate(Expression? expression)
         {
             DbExpressionNominator n = new DbExpressionNominator { isFullNominate = true };
-            Expression result = n.Visit(expression);
+            Expression result = n.Visit(expression)!;
 
             return result;
         }
 
-        static internal Expression FullNominateNotNullable(Expression expression)
+        static internal Expression? FullNominateNotNullable(Expression? expression)
         {
             DbExpressionNominator n = new DbExpressionNominator { isFullNominate = true, isNotNullRoot = expression };
-            Expression result = n.Visit(expression);
+            Expression result = n.Visit(expression)!;
 
             return result;
         }
 
-        public override Expression Visit(Expression exp)
+        public override Expression Visit(Expression? exp)
         {
             Expression result = base.Visit(exp);
-            if (isFullNominate && result != null && !Has(result) && !IsExcluded(exp) && !ExtractDayOfWeek(result, out var bla))
+            if (isFullNominate && result != null && !Has(result) && !IsExcluded(exp!) && !ExtractDayOfWeek(result, out var bla))
                 throw new InvalidOperationException("The expression can not be translated to SQL: " + result.ToString());
 
 
@@ -86,7 +89,7 @@ public override Expression Visit(Expression exp)
 
         private bool IsExcluded(Expression exp)
         {
-            DbExpression expDb = exp as DbExpression;
+            DbExpression? expDb = exp as DbExpression;
             if (expDb == null)
                 return false;
 
@@ -267,7 +270,7 @@ protected override Expression VisitConstant(ConstantExpression c)
         protected internal override Expression VisitSqlFunction(SqlFunctionExpression sqlFunction)
         {
             //We can not assume allways true because neasted projections
-            Expression obj = Visit(sqlFunction.Object);
+            Expression? obj = Visit(sqlFunction.Object);
             ReadOnlyCollection<Expression> args = Visit(sqlFunction.Arguments);
             if (args != sqlFunction.Arguments || obj != sqlFunction.Object)
                 sqlFunction = new SqlFunctionExpression(sqlFunction.Type, obj, sqlFunction.SqlFunction, args); ;
@@ -280,7 +283,7 @@ protected internal override Expression VisitSqlFunction(SqlFunctionExpression sq
 
         protected internal override Expression VisitSqlTableValuedFunction(SqlTableValuedFunctionExpression sqlFunction)
         {
-            ReadOnlyCollection<Expression> args = Visit(sqlFunction.Arguments, a => Visit(a));
+            ReadOnlyCollection<Expression> args = Visit(sqlFunction.Arguments, a => Visit(a)!);
             if (args != sqlFunction.Arguments)
                 sqlFunction = new SqlTableValuedFunctionExpression(sqlFunction.SqlFunction, sqlFunction.Table, sqlFunction.Alias, args); ;
 
@@ -294,7 +297,7 @@ protected internal override Expression VisitSqlCast(SqlCastExpression castExpr)
         {
             var expression = Visit(castExpr.Expression);
             if (expression != castExpr.Expression)
-                castExpr = new SqlCastExpression(castExpr.Type, expression, castExpr.SqlDbType);
+                castExpr = new SqlCastExpression(castExpr.Type, expression!, castExpr.SqlDbType);
             return Add(castExpr);
         }
 
@@ -341,7 +344,7 @@ protected internal override Expression VisitCase(CaseExpression cex)
             return cex;
         }
 
-        protected Expression TrySqlToString(MethodCallExpression m)
+        protected Expression? TrySqlToString(MethodCallExpression m)
         {
             var expression = m.Object;
 
@@ -363,11 +366,11 @@ protected Expression TrySqlToString(MethodCallExpression m)
             return null;
         }
 
-        protected Expression GetFormatToString(MethodCallExpression m, string defaultFormat = null)
+        protected Expression GetFormatToString(MethodCallExpression m, string? defaultFormat = null)
         {
             var culture = m.TryGetArgument("culture")?.Let(e => (CultureInfo)((ConstantExpression)Visit(e)).Value) ?? CultureInfo.CurrentCulture;
 
-            string format = m.TryGetArgument("format")?.Let(e => (string)((ConstantExpression)Visit(e)).Value) ?? defaultFormat;
+            string format = m.TryGetArgument("format")?.Let(e => (string)((ConstantExpression)Visit(e)).Value) ?? defaultFormat!;
 
             var obj = Visit(m.Object);
 
@@ -380,17 +383,17 @@ protected Expression GetFormatToString(MethodCallExpression m, string defaultFor
                 new SqlConstantExpression(culture.Name) }));
         }
 
-        protected Expression TrySqlFunction(Expression obj, SqlFunction sqlFunction, Type type, params Expression[] expression)
+        protected Expression? TrySqlFunction(Expression? obj, SqlFunction sqlFunction, Type type, params Expression[] expression)
         {
             return TrySqlFunction(obj, sqlFunction.ToString(), type, expression);
         }
 
-        protected Expression TrySqlFunction(Expression obj, string sqlFunction, Type type, params Expression[] expression)
+        protected Expression? TrySqlFunction(Expression? obj, string sqlFunction, Type type, params Expression[] expression)
         {
             if (innerProjection)
                 return null;
 
-            Expression newObj = null;
+            Expression? newObj = null;
             if (obj != null)
             {
                 newObj = Visit(obj);
@@ -411,7 +414,7 @@ protected Expression TrySqlFunction(Expression obj, string sqlFunction, Type typ
             return Add(new SqlFunctionExpression(type, newObj, sqlFunction.ToString(), newExpressions));
         }
 
-        private SqlFunctionExpression TrySqlDifference(SqlEnums sqlEnums, Type type, Expression expression)
+        private SqlFunctionExpression? TrySqlDifference(SqlEnums sqlEnums, Type type, Expression expression)
         {
             if (innerProjection)
                 return null;
@@ -427,7 +430,7 @@ private SqlFunctionExpression TrySqlDifference(SqlEnums sqlEnums, Type type, Exp
             return null;
         }
 
-        private SqlFunctionExpression TrySqlDifference(SqlEnums sqlEnums, Type type, Expression leftSide, Expression rightSide)
+        private SqlFunctionExpression? TrySqlDifference(SqlEnums sqlEnums, Type type, Expression leftSide, Expression rightSide)
         {
             Expression left = Visit(leftSide);
             if (!Has(left.RemoveNullify()))
@@ -443,7 +446,7 @@ private SqlFunctionExpression TrySqlDifference(SqlEnums sqlEnums, Type type, Exp
             return Add(result);
         }
 
-        private Expression TrySqlDate(Expression expression)
+        private Expression? TrySqlDate(Expression expression)
         {
             Expression expr = Visit(expression);
             if (innerProjection || !Has(expr))
@@ -464,7 +467,7 @@ private Expression TrySqlDate(Expression expression)
         }
 
 
-        private Expression TrySqlTime(Expression expression)
+        private Expression? TrySqlTime(Expression expression)
         {
             Expression expr = Visit(expression);
             if (innerProjection || !Has(expr))
@@ -480,20 +483,20 @@ private Expression TrySqlTime(Expression expression)
             throw new InvalidOperationException("{0} not supported on SQL Server 2005");
         }
 
-        private Expression TrySqlDayOftheWeek(Expression expression)
+        private Expression? TrySqlDayOftheWeek(Expression expression)
         {
             Expression expr = Visit(expression);
             if (innerProjection || !Has(expr))
                 return null;
 
-            var number = TrySqlFunction(null, SqlFunction.DATEPART, typeof(int?), new SqlEnumExpression(SqlEnums.weekday), expr);
+            var number = TrySqlFunction(null, SqlFunction.DATEPART, typeof(int?), new SqlEnumExpression(SqlEnums.weekday), expr)!;
 
             Add(number);
 
             return new ToDayOfWeekExpression(number).TryConvert(typeof(DayOfWeek));
         }
         
-        private Expression TrySqlStartOf(Expression expression, SqlEnums part)
+        private Expression? TrySqlStartOf(Expression expression, SqlEnums part)
         {
             Expression expr = Visit(expression);
             if (innerProjection || !Has(expr))
@@ -501,13 +504,13 @@ private Expression TrySqlStartOf(Expression expression, SqlEnums part)
 
             Expression result =
                 TrySqlFunction(null, SqlFunction.DATEADD, expr.Type, new SqlEnumExpression(part),
-                      TrySqlFunction(null, SqlFunction.DATEDIFF, typeof(int), new SqlEnumExpression(part), new SqlConstantExpression(0), expr),
-                    new SqlConstantExpression(0));
+                      TrySqlFunction(null, SqlFunction.DATEDIFF, typeof(int), new SqlEnumExpression(part), new SqlConstantExpression(0), expr)!,
+                    new SqlConstantExpression(0))!;
 
             return Add(result);
         }
 
-        private Expression TrySqlSecondsStart(Expression expression)
+        private Expression? TrySqlSecondsStart(Expression expression)
         {
             Expression expr = Visit(expression);
             if (innerProjection || !Has(expr))
@@ -516,13 +519,13 @@ private Expression TrySqlSecondsStart(Expression expression)
 
             Expression result =
                 TrySqlFunction(null, SqlFunction.DATEADD, expr.Type, new SqlEnumExpression(SqlEnums.millisecond),
-                Expression.Negate(TrySqlFunction(null, SqlFunction.DATEPART, typeof(int), new SqlEnumExpression(SqlEnums.millisecond), expr)), expr);
+                Expression.Negate(TrySqlFunction(null, SqlFunction.DATEPART, typeof(int), new SqlEnumExpression(SqlEnums.millisecond), expr)), expr)!;
 
             return Add(result);
         }
 
 
-        private Expression TryAddSubtractDateTimeTimeSpan(Expression date, Expression time, bool add)
+        private Expression? TryAddSubtractDateTimeTimeSpan(Expression date, Expression time, bool add)
         {
             Expression exprDate = Visit(date);
             Expression exprTime = Visit(time);
@@ -538,7 +541,7 @@ private Expression TryAddSubtractDateTimeTimeSpan(Expression date, Expression ti
             return Add(result);
         }
 
-        private Expression TryDatePartTo(SqlEnumExpression datePart, Expression start, Expression end)
+        private Expression? TryDatePartTo(SqlEnumExpression datePart, Expression start, Expression end)
         {
             Expression exprStart = Visit(start);
             Expression exprEnd = Visit(end);
@@ -557,7 +560,7 @@ private Expression TryDatePartTo(SqlEnumExpression datePart, Expression start, E
         }
 
 
-        private Expression TrySqlTrim(Expression expression)
+        private Expression? TrySqlTrim(Expression expression)
         {
             Expression expr = Visit(expression);
             if (innerProjection || !Has(expr))
@@ -565,7 +568,7 @@ private Expression TrySqlTrim(Expression expression)
 
             Expression result =
                 TrySqlFunction(null, SqlFunction.LTRIM, expression.Type,
-                      TrySqlFunction(null, SqlFunction.RTRIM, expression.Type, expression));
+                      TrySqlFunction(null, SqlFunction.RTRIM, expression.Type, expression)!)!;
 
             return Add(result);
         }
@@ -596,8 +599,8 @@ protected override Expression VisitBinary(BinaryExpression b)
                     if(ExtractDayOfWeek(left, out var ldow) &&
                        ExtractDayOfWeek(right, out var rdow))
                     {
-                        left = ldow;
-                        right = rdow;
+                        left = ldow!;
+                        right = rdow!;
                     }
 
                     newB = MakeBinaryFlexible(b.NodeType, left, right);
@@ -668,7 +671,7 @@ protected override Expression VisitBinary(BinaryExpression b)
             }
         }
 
-        private bool ExtractDayOfWeek(Expression exp, out Expression result)
+        private bool ExtractDayOfWeek(Expression exp, out Expression? result)
         {
             if (exp is ToDayOfWeekExpression tdow)
             {
@@ -676,8 +679,8 @@ private bool ExtractDayOfWeek(Expression exp, out Expression result)
                 return true;
             }
 
-            if (exp.NodeType == ExpressionType.Convert && exp.Type.UnNullify() == typeof(DayOfWeek))
-                return ExtractDayOfWeek(((UnaryExpression)exp).Operand, out result);
+            if (exp!/*CSBUG*/.NodeType == ExpressionType.Convert && exp!/*CSBUG*/.Type.UnNullify() == typeof(DayOfWeek))
+                return ExtractDayOfWeek(((UnaryExpression)exp!/*CSBUG*/).Operand, out result);
 
             result = null;
             return false;
@@ -718,7 +721,7 @@ public static Expression ConvertNull(Expression nullNode, Type type)
             }
         }
 
-        public Expression SimpleNot(Expression e)
+        public Expression? SimpleNot(Expression e)
         {
             if (e.NodeType == ExpressionType.Not)
                 return ((UnaryExpression)e).Operand;
@@ -741,12 +744,12 @@ private Expression ConvertToSqlCoallesce(BinaryExpression b)
             if (left is SqlFunctionExpression fLeft && fLeft.SqlFunction == SqlFunction.COALESCE.ToString())
                 expressions.AddRange(fLeft.Arguments);
             else
-                expressions.Add(left);
+                expressions.Add(left!/*CSBUG*/);
 
             if (right is SqlFunctionExpression fRight && fRight.SqlFunction == SqlFunction.COALESCE.ToString())
                 expressions.AddRange(fRight.Arguments);
             else
-                expressions.Add(right);
+                expressions.Add(right!/*CSBUG*/);
 
             return Add(new SqlFunctionExpression(b.Type, null, SqlFunction.COALESCE.ToString(), expressions));
         }
@@ -910,6 +913,8 @@ protected override Expression VisitConditional(ConditionalExpression c)
                 }
                 else
                 {
+                    ifFalse = ifFalse!; /*CSBUG*/
+
                     if (ifTrue.IsNull() && ifFalse.IsNull())
                         return ifTrue; //cond? null: null doesn't work in sql
 
@@ -1102,7 +1107,7 @@ protected internal override Expression VisitLike(LikeExpression like)
             return like;
         }
 
-        private Expression TryLike(Expression expression, Expression pattern)
+        private Expression? TryLike(Expression expression, Expression pattern)
         {
             if (expression.IsNull())
                 return Add(Expression.Constant(false));
@@ -1120,7 +1125,7 @@ private Expression TryLike(Expression expression, Expression pattern)
             return null;
         }
 
-        private Expression TryCharIndex(Expression expression, Expression subExpression, Func<Expression, Expression> compare)
+        private Expression? TryCharIndex(Expression expression, Expression subExpression, Func<Expression, Expression> compare)
         {
             if (expression.IsNull())
                 return Add(Expression.Constant(false));
@@ -1171,14 +1176,14 @@ protected override Expression VisitMember(MemberExpression m)
                 return nullable;
             }
 
-            Expression hardResult = HardCodedMembers(m);
+            Expression? hardResult = HardCodedMembers(m);
             if (hardResult != null)
                 return hardResult;
 
             return base.VisitMember(m);
         }
 
-        public Expression HardCodedMembers(MemberExpression m)
+        public Expression? HardCodedMembers(MemberExpression m)
         {
             switch (m.Member.DeclaringType.TypeName() + "." + m.Member.Name)
             {
@@ -1202,8 +1207,7 @@ public Expression HardCodedMembers(MemberExpression m)
                         if (diff == null)
                             return null;
 
-                        return Add(new SqlCastExpression(typeof(int?),
-                            TrySqlFunction(null, SqlFunction.FLOOR, typeof(double?), diff)));
+                        return Add(new SqlCastExpression(typeof(int?), TrySqlFunction(null, SqlFunction.FLOOR, typeof(double?), diff)!));
                     }
                 case "TimeSpan.Hours": return TrySqlFunction(null, SqlFunction.DATEPART, m.Type, new SqlEnumExpression(SqlEnums.hour), m.Expression);
                 case "TimeSpan.Minutes": return TrySqlFunction(null, SqlFunction.DATEPART, m.Type, new SqlEnumExpression(SqlEnums.minute), m.Expression);
@@ -1232,9 +1236,9 @@ public Expression HardCodedMembers(MemberExpression m)
             }
         }
 
-        protected override Expression VisitMethodCall(MethodCallExpression m)
+        protected override Expression? VisitMethodCall(MethodCallExpression m)
         {
-            Expression result = HardCodedMethods(m);
+            Expression? result = HardCodedMethods(m);
             if (result != null)
                 return result;
 
@@ -1246,12 +1250,12 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
             return base.VisitMethodCall(m);
         }
 
-        private Expression GetDateTimeToStringSqlFunction(MethodCallExpression m, string defaultFormat = null)
+        private Expression? GetDateTimeToStringSqlFunction(MethodCallExpression m, string? defaultFormat = null)
         {
             return Connector.Current.SupportsFormat ? GetFormatToString(m, defaultFormat) : TrySqlToString(m);
         }
 
-        private Expression HardCodedMethods(MethodCallExpression m)
+        private Expression? HardCodedMethods(MethodCallExpression m)
         {
             if (m.Method.Name == "ToString")
                 return TrySqlToString(m);
@@ -1282,7 +1286,7 @@ private Expression HardCodedMethods(MethodCallExpression m)
                     {
                         Expression startIndex = m.TryGetArgument("startIndex")?.Let(e => Expression.Add(e, new SqlConstantExpression(1)));
 
-                        Expression charIndex = TrySqlFunction(null, SqlFunction.CHARINDEX, m.Type, m.GetArgument("value"), m.Object, startIndex);
+                        Expression? charIndex = TrySqlFunction(null, SqlFunction.CHARINDEX, m.Type, m.GetArgument("value"), m.Object, startIndex);
                         if (charIndex == null)
                             return null;
                         Expression result = Expression.Subtract(charIndex, new SqlConstantExpression(1));
@@ -1311,8 +1315,8 @@ private Expression HardCodedMethods(MethodCallExpression m)
                     return TryCharIndex(m.GetArgument("value"), m.Object, index => Expression.Equal(index, new SqlConstantExpression(1)));
                 case "string.EndsWith":
                     return TryCharIndex(
-                        TrySqlFunction(null, SqlFunction.REVERSE, m.Type, m.GetArgument("value")),
-                        TrySqlFunction(null, SqlFunction.REVERSE, m.Type, m.Object),
+                        TrySqlFunction(null, SqlFunction.REVERSE, m.Type, m.GetArgument("value"))!,
+                        TrySqlFunction(null, SqlFunction.REVERSE, m.Type, m.Object)!,
                         index => Expression.Equal(index, new SqlConstantExpression(1)));
                 case "string.Format":
                 case "StringExtensions.FormatWith":
@@ -1408,13 +1412,13 @@ private Expression HardCodedMethods(MethodCallExpression m)
             }
         }
 
-        private Expression TryStringFormat(MethodCallExpression m)
+        private Expression? TryStringFormat(MethodCallExpression m)
         {
             var prov = m.TryGetArgument("provider");
             if (prov != null)
                 return null;
 
-            var format = (m.Object ?? m.GetArgument("format")) as ConstantExpression;
+            var format = (ConstantExpression)(m.Object ?? m.GetArgument("format"));
 
             var args = m.TryGetArgument("args")?.Let(a => ((NewArrayExpression)a).Expressions) ??
                 new[] { m.TryGetArgument("arg0"), m.TryGetArgument("arg1"), m.TryGetArgument("arg2"), m.TryGetArgument("arg3") }.NotNull().ToReadOnly();
@@ -1428,7 +1432,7 @@ private Expression TryStringFormat(MethodCallExpression m)
 
             var firsStr = strFormat.Substring(0, matches.FirstEx().Index);
 
-            Expression acum = firsStr.HasText() ? new SqlConstantExpression(firsStr) : null;
+            Expression? acum = firsStr.HasText() ? new SqlConstantExpression(firsStr) : null;
 
             for (int i = 0; i < matches.Count; i++)
             {
@@ -1454,7 +1458,7 @@ private Expression TryStringFormat(MethodCallExpression m)
             return Add(acum);
         }
 
-        private Expression TryEtc(Expression str, Expression max, Expression etcString)
+        private Expression? TryEtc(Expression str, Expression max, Expression etcString)
         {
             var newStr = Visit(str);
             if (!Has(newStr))
diff --git a/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs b/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
index 41d57c6b42..e9aee96131 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
@@ -91,7 +91,7 @@ internal class OverloadingSimplifier : ExpressionVisitor
 
         static int i = 0;
 
-        public static Expression Simplify(Expression expression)
+        public static Expression? Simplify(Expression? expression)
         {
             return new OverloadingSimplifier().Visit(expression);
         }
@@ -471,14 +471,14 @@ private Expression CallToString(Expression expression)
             var visitedToStrExp = Visit(toStrExp);
 
             return Expression.Condition(
-                Expression.Equal(expression, Expression.Constant(null, expression.Type.Nullify())),
+                Expression.Equal(expression, Expression.Constant(null, expression!/*CSBUG*/.Type.Nullify())),
                 Expression.Constant(null, typeof(string)),
                 Visit(visitedToStrExp));
         }
 
         public static bool ExtractDefaultIfEmpty(ref Expression expression)
         {
-            MethodCallExpression mce = expression as MethodCallExpression;
+            MethodCallExpression? mce = expression as MethodCallExpression;
 
             if (mce == null || !mce.Method.IsGenericMethod)
                 return false;
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
index d4e8356f56..a0118e2278 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
@@ -37,6 +37,7 @@ public QueryBinder(AliasGenerator aliasGenerator)
         {
             this.systemTime = SystemTime.Current;
             this.aliasGenerator = aliasGenerator;
+            this.root = null!;
         }
 
         public class GroupByInfo
@@ -44,6 +45,13 @@ public class GroupByInfo
             public Alias GroupAlias;
             public Expression Projector;
             public SourceExpression Source;
+
+            public GroupByInfo(Alias groupAlias, Expression projector, SourceExpression source)
+            {
+                GroupAlias = groupAlias;
+                Projector = projector;
+                Source = source;
+            }
         }
 
         Expression root;
@@ -59,7 +67,7 @@ public Expression BindQuery(Expression expression)
             return expandedResult;
         }
 
-        protected override Expression VisitMethodCall(MethodCallExpression m)
+        protected override Expression? VisitMethodCall(MethodCallExpression m)
         {
             if (m.Method.DeclaringType == typeof(Queryable) ||
                 m.Method.DeclaringType == typeof(Enumerable) ||
@@ -135,7 +143,7 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
             }
             else if (m.Method.DeclaringType == typeof(LinqHintsExpand))
             {
-                if(m.Method.Name == nameof(LinqHintsExpand.ExpandLite))
+                if (m.Method.Name == nameof(LinqHintsExpand.ExpandLite))
                     return BindExpandLite(m.Type, m.GetArgument("source"), m.GetArgument("liteSelector").StripQuotes(), (ExpandLite)((ConstantExpression)m.GetArgument("expandLite")).Value);
 
                 if (m.Method.Name == nameof(LinqHintsExpand.ExpandEntity))
@@ -159,23 +167,21 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
             }
             else if (m.Method.DeclaringType == typeof(LinqHintEntities))
             {
-                var expression = Visit(m.Arguments[0]) as ImplementedByExpression;
-
-                var ib = expression as ImplementedByExpression;
+                var ib = Visit(m.Arguments[0]) as ImplementedByExpression;
 
                 if (ib == null)
                     throw new InvalidOperationException("Method {0} is only meant to be used on {1}".FormatWith(m.Method.Name, typeof(ImplementedByExpression).Name));
 
                 CombineStrategy strategy = GetStrategy(m.Method);
 
-                return new ImplementedByExpression(ib.Type, strategy, expression.Implementations);
+                return new ImplementedByExpression(ib.Type, strategy, ib.Implementations);
             }
             else if (m.Method.DeclaringType == typeof(Lite) && m.Method.Name == "ToLite")
             {
                 Expression toStr = Visit(m.TryGetArgument("toStr")); //could be null
 
                 var entity = Visit(m.GetArgument("entity"));
-                var converted = EntityCasting(entity, Lite.Extract(m.Type));
+                var converted = EntityCasting(entity, Lite.Extract(m.Type)!)!;
                 return MakeLite(converted, toStr);
             }
             else if (m.Method.DeclaringType.IsInstantiationOf(typeof(EnumEntity<>)) && m.Method.Name == "ToEnum")
@@ -218,7 +224,7 @@ private Expression BindExpandEntity(Type type, Expression source, LambdaExpressi
                             kvp => kvp.Key,
                             kvp => kvp.Value.WithExpandEntity(expandEntity)));
 
-                    throw new NotImplementedException("Expand Entity not supported for " + e.GetType());
+                    throw new NotImplementedException("Expand Entity not supported for " + e!/*CSBUG*/.GetType());
                 });
 
             return new ProjectionExpression(projection.Select, newProjector, projection.UniqueFunction, projection.Type);
@@ -230,7 +236,7 @@ private Expression BindExpandLite(Type type, Expression source, LambdaExpression
 
             var members = Reflector.GetMemberListUntyped(entitySelector);
 
-            var newProjector = ChangeProjector(0, members,  projection.Projector,
+            var newProjector = ChangeProjector(0, members, projection.Projector,
                 e => ((LiteReferenceExpression)e).WithExpandLite(expandLite));
 
             return new ProjectionExpression(projection.Select, newProjector, projection.UniqueFunction, projection.Type);
@@ -273,7 +279,7 @@ private Expression ChangeProjector(int index, MemberInfo[] members, Expression p
                     ee = Completed(ee);
 
 
-                    var fi = m as FieldInfo ?? Reflector.FindFieldInfo(m.DeclaringType, (PropertyInfo)m);
+                    var fi = m as FieldInfo ?? Reflector.FindFieldInfo(m!/*CSBUG*/.DeclaringType, (PropertyInfo)m! /*CSBUG*/);
 
                     var newBinding = ChangeProjector(index + 1, members, ee.GetBinding(fi), changeExpression);
 
@@ -285,7 +291,7 @@ private Expression ChangeProjector(int index, MemberInfo[] members, Expression p
                 }
                 else if (projector is NewExpression ne)
                 {
-                    var p = (PropertyInfo)m;
+                    var p = (PropertyInfo)m! /*CSBUG*/;
 
                     var mIndex = ne.Members.IndexOf(pi => ReflectionTools.PropertyEquals((PropertyInfo)pi, p));
 
@@ -300,7 +306,7 @@ private Expression ChangeProjector(int index, MemberInfo[] members, Expression p
                     var proj = MListProjection(me, true);
                     using (SetCurrentSource(proj.Select))
                     {
-                        var mle = (NewExpression) proj.Projector;
+                        var mle = (NewExpression)proj.Projector;
 
                         var paramIndex = mle.Constructor.GetParameters().IndexOf(p => p.Name == "value");
 
@@ -316,13 +322,13 @@ private Expression ChangeProjector(int index, MemberInfo[] members, Expression p
                 }
             }
 
-            throw new NotImplementedException($"ChangeProjector not implemented for projector of type {projector.Type} and member {m}");
+            throw new NotImplementedException($"ChangeProjector not implemented for projector of type {projector!/*CSBUG*/.Type} and member {m}");
         }
 
-        string currentTableHint;
+        string? currentTableHint;
         private Expression BindWithHints(Expression source, ConstantExpression hint)
         {
-            string oldHint = currentTableHint;
+            string? oldHint = currentTableHint;
             try
             {
                 currentTableHint = (string)hint.Value;
@@ -360,7 +366,7 @@ private Expression MapVisitExpand(LambdaExpression lambda, ProjectionExpression
             return MapVisitExpand(lambda, projection.Projector, projection.Select);
         }
 
-        internal Expression MapVisitExpand(LambdaExpression lambda, Expression projector, SourceExpression source)
+        internal Expression MapVisitExpand(LambdaExpression lambda, Expression projector, SourceExpression? source)
         {
             using (SetCurrentSource(source))
             {
@@ -475,10 +481,10 @@ private Expression BindUniqueRow(Type resultType, UniqueFunction function, Expre
 
             ProjectionExpression projection = (ProjectionExpression)AliasReplacer.Replace(expandedProjector, this.aliasGenerator);
 
-            Expression where = predicate == null ? null : DbExpressionNominator.FullNominate(MapVisitExpand(predicate, projection));
+            Expression? where = predicate == null ? null : DbExpressionNominator.FullNominate(MapVisitExpand(predicate, projection));
 
             Alias alias = NextSelectAlias();
-            Expression top = function == UniqueFunction.First || function == UniqueFunction.FirstOrDefault ? Expression.Constant(1) : null;
+            Expression? top = function == UniqueFunction.First || function == UniqueFunction.FirstOrDefault ? Expression.Constant(1) : null;
 
             ProjectedColumns pc = ColumnProjector.ProjectColumns(projection.Projector, alias);
 
@@ -497,11 +503,7 @@ private Expression BindUniqueRow(Type resultType, UniqueFunction function, Expre
             {
 
 
-                AddRequest(new UniqueRequest
-                {
-                    Select = newProjector.Select,
-                    OuterApply = function == UniqueFunction.SingleOrDefault || function == UniqueFunction.FirstOrDefault
-                });
+                AddRequest(new UniqueRequest(newProjector.Select, outerApply: function == UniqueFunction.SingleOrDefault || function == UniqueFunction.FirstOrDefault));
 
                 return newProjector.Projector;
             });
@@ -563,7 +565,7 @@ private Expression BindToString(Expression source, Expression separator, MethodI
 
             string value = (string)((ConstantExpression)separator).Value;
 
-            ColumnDeclaration cd = new ColumnDeclaration(null, Expression.Add(new SqlConstantExpression(value, typeof(string)), nominated, miStringConcat));
+            ColumnDeclaration cd = new ColumnDeclaration(null!, Expression.Add(new SqlConstantExpression(value, typeof(string)), nominated, miStringConcat));
 
             Alias alias = NextSelectAlias();
 
@@ -581,9 +583,9 @@ private Expression BindToString(Expression source, Expression separator, MethodI
         static MethodInfo miStringConcat = ReflectionTools.GetMethodInfo(() => string.Concat("", ""));
 
 
-        (Expression newSource, LambdaExpression selector, bool distinct) DisassembleAggregate(AggregateSqlFunction aggregate, Expression source, LambdaExpression selectorOrPredicate, bool isRoot)
+        (Expression newSource, LambdaExpression? selector, bool distinct) DisassembleAggregate(AggregateSqlFunction aggregate, Expression source, LambdaExpression? selectorOrPredicate, bool isRoot)
         {
-            if(aggregate == AggregateSqlFunction.Count)
+            if (aggregate == AggregateSqlFunction.Count)
             {
                 if (selectorOrPredicate != null)
                 {
@@ -599,38 +601,38 @@ private Expression BindToString(Expression source, Expression separator, MethodI
                 {
                     if (ExtractWhere(source, out var inner, out var predicate) &&
                         ExtractDistinct(inner, out var inner2) &&
-                        ExtractSelect(inner2, out var inner3, out var selector) &&
-                        IsNotNull(predicate.Body, out var p) && p == predicate.Parameters.SingleEx())
-                        return (inner3, selector, true);
+                        ExtractSelect(inner2!, out var inner3, out var selector) &&
+                        IsNotNull(predicate!.Body, out var p) && p == predicate!.Parameters.SingleEx())
+                        return (inner3!, selector!, true);
                 }
 
                 //Select NotNull Distinct
                 {
                     if (ExtractDistinct(source, out var inner) &&
                         ExtractWhere(inner, out var inner2, out var predicate) &&
-                        ExtractSelect(inner2, out var inner3, out var selector) &&
-                        IsNotNull(predicate.Body, out var p) && p == predicate.Parameters.SingleEx())
-                        return (inner3, selector, true);
+                        ExtractSelect(inner2!, out var inner3, out var selector) &&
+                        IsNotNull(predicate!.Body, out var p) && p == predicate!.Parameters.SingleEx())
+                        return (inner3!, selector!, true);
                 }
 
                 //NotNull Select Distinct
                 {
                     if (ExtractDistinct(source, out var inner) &&
-                        ExtractSelect(inner, out var inner2, out var selector) &&
+                        ExtractSelect(inner!, out var inner2, out var selector) &&
                         ExtractWhere(inner2, out var inner3, out var predicate) &&
-                        IsNotNull(predicate.Body, out var p) && ExpressionComparer.AreEqual(p, selector.Body,
-                        new ScopedDictionary<ParameterExpression, ParameterExpression>(null) { { predicate.Parameters.Single(), selector.Parameters.Single() } }))
-                        return (inner3, selector, true);
+                        IsNotNull(predicate!.Body, out var p) && ExpressionComparer.AreEqual(p!, selector!.Body,
+                        new ScopedDictionary<ParameterExpression, ParameterExpression>(null) { { predicate!.Parameters.Single(), selector!.Parameters.Single() } }))
+                        return (inner3!, selector!, true);
                 }
 
-                if(!isRoot)
+                if (!isRoot)
                 {
                     //Preferring Count(predicate)
                     //instead of Count (*) Where predicate
                     //is tricky
                     if (ExtractWhere(source, out var inner, out var predicate) &&
                         inner is ParameterExpression p && p.Type.IsInstantiationOf(typeof(IGrouping<,>)) &&
-                        SimplePredicateVisitor.IsSimple(predicate))
+                        SimplePredicateVisitor.IsSimple(predicate!))
                         return (inner, predicate, false);
                 }
 
@@ -638,10 +640,10 @@ private Expression BindToString(Expression source, Expression separator, MethodI
             }
             else
             {
-                if(selectorOrPredicate != null)
+                if (selectorOrPredicate != null)
                     return (source, selectorOrPredicate, false);
-                else if(ExtractSelect(source, out var innerSource, out var selector))
-                    return (innerSource, selector, false);
+                else if (ExtractSelect(source, out var innerSource, out var selector))
+                    return (innerSource!, selector!, false);
                 else
                     return (source, null, false);
             }
@@ -651,12 +653,15 @@ class SimplePredicateVisitor : ExpressionVisitor
         {
             public ParameterExpression[] AllowedParameters;
             public bool HasExternalParameter = false;
+
+            public SimplePredicateVisitor(ParameterExpression[] allowedParameters)
+            {
+                AllowedParameters = allowedParameters;
+            }
+
             public static bool IsSimple(LambdaExpression lambda)
             {
-                var extParam = new SimplePredicateVisitor
-                {
-                    AllowedParameters = lambda.Parameters.ToArray()
-                };
+                var extParam = new SimplePredicateVisitor(lambda.Parameters.ToArray());
                 extParam.Visit(lambda.Body);
                 return !extParam.HasExternalParameter;
             }
@@ -670,9 +675,9 @@ protected override Expression VisitParameter(ParameterExpression node)
             }
         }
 
-        private bool IsNotNull(Expression body, out Expression p)
+        private bool IsNotNull(Expression? body, out Expression? p)
         {
-            if(body is BinaryExpression b && b.NodeType == ExpressionType.NotEqual)
+            if (body is BinaryExpression b && b.NodeType == ExpressionType.NotEqual)
             {
                 p = b.Left.IsNull() ? b.Right :
                     b.Right.IsNull() ? b.Left :
@@ -687,9 +692,9 @@ private bool IsNotNull(Expression body, out Expression p)
 
         }
 
-        bool ExtractSelect(Expression source, out Expression innerSource, out LambdaExpression selector)
+        bool ExtractSelect(Expression source, out Expression? innerSource, out LambdaExpression? selector)
         {
-            if(source is MethodCallExpression mc &&
+            if (source is MethodCallExpression mc &&
                     (mc.Method.IsInstantiationOf(OverloadingSimplifier.miSelectE) ||
                     mc.Method.IsInstantiationOf(OverloadingSimplifier.miSelectQ)))
             {
@@ -705,7 +710,7 @@ bool ExtractSelect(Expression source, out Expression innerSource, out LambdaExpr
             }
         }
 
-        bool ExtractWhere(Expression source, out Expression innerSource, out LambdaExpression predicate)
+        bool ExtractWhere(Expression? source, out Expression? innerSource, out LambdaExpression? predicate)
         {
             if (source is MethodCallExpression mc &&
                     (mc.Method.IsInstantiationOf(OverloadingSimplifier.miWhereE) ||
@@ -723,7 +728,7 @@ bool ExtractWhere(Expression source, out Expression innerSource, out LambdaExpre
             }
         }
 
-        bool ExtractDistinct(Expression source, out Expression innerSource)
+        bool ExtractDistinct(Expression? source, out Expression? innerSource)
         {
             if (source is MethodCallExpression mc &&
                     (mc.Method.IsInstantiationOf(OverloadingSimplifier.miDistinctE) ||
@@ -740,35 +745,37 @@ bool ExtractDistinct(Expression source, out Expression innerSource)
         }
 
 
-        private Expression BindAggregate(Type resultType, AggregateSqlFunction aggregateFunction, Expression source, LambdaExpression selectorOrPredicate, bool isRoot)
+        private Expression? BindAggregate(Type resultType, AggregateSqlFunction aggregateFunction, Expression source, LambdaExpression selectorOrPredicate, bool isRoot)
         {
             var (newSource, selector, distinct) = DisassembleAggregate(aggregateFunction, source, selectorOrPredicate, isRoot);
 
             ProjectionExpression projection = VisitCastProjection(newSource);
 
-            GroupByInfo info = groupByMap.TryGetC(projection.Select.Alias);
+            GroupByInfo? info = groupByMap.TryGetC(projection.Select.Alias);
             if (info != null)
             {
-                Expression exp = aggregateFunction == AggregateSqlFunction.Count && selector == null ? null : //Count(*)
+                Expression? exp = aggregateFunction == AggregateSqlFunction.Count && selector == null ? null : //Count(*)
                     aggregateFunction == AggregateSqlFunction.Count && !distinct ? MapVisitExpand(ToNotNullPredicate(selector), info.Projector, info.Source) :
                     selector != null ? MapVisitExpand(selector, info.Projector, info.Source) : //Sum(Amount), Avg(Amount), ...
                     info.Projector;
 
                 exp = exp == null ? null : SmartEqualizer.UnwrapPrimaryKey(exp);
 
-                var nominated = aggregateFunction == AggregateSqlFunction.Count ? DbExpressionNominator.FullNominateNotNullable(exp) :
+                var nominated = aggregateFunction == AggregateSqlFunction.Count ?
+                    DbExpressionNominator.FullNominateNotNullable(exp):
                     DbExpressionNominator.FullNominate(exp);
 
                 var result = new AggregateRequestsExpression(info.GroupAlias,
                     new AggregateExpression(aggregateFunction == AggregateSqlFunction.Count ? typeof(int) : GetBasicType(nominated),
-                    nominated, aggregateFunction,
+                    nominated!,
+                    aggregateFunction,
                     distinct));
 
                 return RestoreWrappedType(result, resultType);
             }
             else //Complicated SubQuery
             {
-                Expression exp = aggregateFunction == AggregateSqlFunction.Count && selector == null ? null :
+                Expression? exp = aggregateFunction == AggregateSqlFunction.Count && selector == null ? null :
                     aggregateFunction == AggregateSqlFunction.Count && !distinct ? MapVisitExpand(ToNotNullPredicate(selector), projection) :
                     selector != null ? MapVisitExpand(selector, projection) :
                     projection.Projector;
@@ -778,7 +785,7 @@ private Expression BindAggregate(Type resultType, AggregateSqlFunction aggregate
                 Expression aggregate;
                 if (aggregateFunction == AggregateSqlFunction.Sum && !resultType.IsNullable())
                 {
-                    var nominated = DbExpressionNominator.FullNominate(exp).Nullify();
+                    var nominated = DbExpressionNominator.FullNominate(exp)!.Nullify();
 
                     aggregate = (Expression)Expression.Coalesce(
                         new AggregateExpression(GetBasicType(nominated), nominated, aggregateFunction, distinct),
@@ -786,11 +793,12 @@ private Expression BindAggregate(Type resultType, AggregateSqlFunction aggregate
                 }
                 else
                 {
-                    var nominated = aggregateFunction == AggregateSqlFunction.Count ? DbExpressionNominator.FullNominateNotNullable(exp) :
+                    var nominated = aggregateFunction == AggregateSqlFunction.Count ? 
+                        DbExpressionNominator.FullNominateNotNullable(exp):
                         DbExpressionNominator.FullNominate(exp);
 
                     aggregate = new AggregateExpression(aggregateFunction == AggregateSqlFunction.Count ? typeof(int) : GetBasicType(nominated),
-                        nominated,
+                        nominated!,
                         aggregateFunction,
                         distinct);
                 }
@@ -814,7 +822,7 @@ private Expression BindAggregate(Type resultType, AggregateSqlFunction aggregate
 
         private LambdaExpression ToNotNullPredicate(LambdaExpression predicate)
         {
-            if(predicate.Body is BinaryExpression be && be.NodeType == ExpressionType.NotEqual)
+            if (predicate.Body is BinaryExpression be && be.NodeType == ExpressionType.NotEqual)
             {
                 var exp =
                     be.Left.IsNull() ? be.Right :
@@ -825,17 +833,13 @@ private LambdaExpression ToNotNullPredicate(LambdaExpression predicate)
                     return Expression.Lambda(exp, predicate.Parameters);
                 }
             }
-            else
-            {
-                var conditional = Expression.Condition(predicate.Body, Expression.Constant("placeholder"), Expression.Constant(null, typeof(string)));
 
-                return Expression.Lambda(conditional, predicate.Parameters);
-            }
+            var conditional = Expression.Condition(predicate.Body, Expression.Constant("placeholder"), Expression.Constant(null, typeof(string)));
 
-            return null;
+            return Expression.Lambda(conditional, predicate.Parameters);
         }
 
-        private Type GetBasicType(Expression nominated)
+        private Type GetBasicType(Expression? nominated)
         {
             if (nominated == null)
                 return typeof(int);
@@ -886,7 +890,7 @@ private Expression BindAnyAll(Type resultType, Expression source, LambdaExpressi
                 if (predicate != null)
                     source = Expression.Call(typeof(Enumerable), "Where", method.GetGenericArguments(), source, predicate);
 
-                ProjectionExpression projection = this.VisitCastProjection(source);
+                ProjectionExpression projection = this.VisitCastProjection(source!/*CSBUG*/);
                 Expression result = new ExistsExpression(projection.Select);
                 if (isAll)
                     result = Expression.Not(result);
@@ -931,12 +935,12 @@ private Expression BindContains(Type resultType, Expression source, Expression i
                 Alias alias = NextSelectAlias();
                 var pc = ColumnProjector.ProjectColumns(projection.Projector, alias, isGroupKey: false, selectTrivialColumns: true);
 
-                SubqueryExpression se = null;
+                SubqueryExpression? se = null;
                 if (Schema.Current.Settings.IsDbType(pc.Projector.Type))
                     se = new InExpression(newItem, new SelectExpression(alias, false, null, pc.Columns, projection.Select, null, null, null, 0));
                 else
                 {
-                    Expression where = DbExpressionNominator.FullNominate(SmartEqualizer.PolymorphicEqual(projection.Projector, newItem));
+                    Expression where = DbExpressionNominator.FullNominate(SmartEqualizer.PolymorphicEqual(projection.Projector, newItem))!;
                     se = new ExistsExpression(new SelectExpression(alias, false, null, pc.Columns, projection.Select, where, null, null, 0));
                 }
 
@@ -968,7 +972,7 @@ private Expression BindWhere(Type resultType, Expression source, LambdaExpressio
             if (exp.NodeType == ExpressionType.Constant && ((bool)((ConstantExpression)exp).Value))
                 return projection;
 
-            Expression where = DbExpressionNominator.FullNominate(exp);
+            Expression where = DbExpressionNominator.FullNominate(exp)!;
 
             Alias alias = NextSelectAlias();
             ProjectedColumns pc = ColumnProjector.ProjectColumns(projection.Projector, alias);
@@ -991,7 +995,7 @@ private Expression BindSelect(Type resultType, Expression source, LambdaExpressi
                 pc.Projector, null, resultType);
         }
 
-        protected virtual Expression BindSelectMany(Type resultType, Expression source, LambdaExpression collectionSelector, LambdaExpression resultSelector)
+        protected virtual Expression BindSelectMany(Type resultType, Expression source, LambdaExpression collectionSelector, LambdaExpression? resultSelector)
         {
             ProjectionExpression projection = this.VisitCastProjection(source);
             bool outer = OverloadingSimplifier.ExtractDefaultIfEmpty(ref collectionSelector);
@@ -1052,7 +1056,7 @@ protected virtual Expression BindJoin(Type resultType, Expression outerSource, E
             Expression outerKeyExpr = MapVisitExpand(outerKey, outerProj);
             Expression innerKeyExpr = MapVisitExpand(innerKey, innerProj);
 
-            Expression condition = DbExpressionNominator.FullNominate(SmartEqualizer.EqualNullable(outerKeyExpr, innerKeyExpr));
+            Expression condition = DbExpressionNominator.FullNominate(SmartEqualizer.EqualNullable(outerKeyExpr, innerKeyExpr))!;
 
             JoinType jt = rightOuter && leftOuter ? JoinType.FullOuterJoin :
                           rightOuter ? JoinType.RightOuterJoin :
@@ -1109,7 +1113,7 @@ private Expression BindGroupBy(Type resultType, Expression source, LambdaExpress
             ProjectedColumns subqueryKeyPC = ColumnProjector.ProjectColumns(subqueryKey, aliasGenerator.Raw("basura"), isGroupKey: true, selectTrivialColumns: true); // use same projection trick to get group-by expressions based on subquery
             Expression subqueryElemExpr = MapVisitExpand(elementSelector, subqueryProjection); // compute element based on duplicated subquery
 
-            Expression subqueryCorrelation = keyPC.Columns.IsEmpty() ? null :
+            Expression? subqueryCorrelation = keyPC.Columns.IsEmpty() ? null :
                 keyPC.Columns.Zip(subqueryKeyPC.Columns, (c1, c2) => SmartEqualizer.EqualNullableGroupBy(new ColumnExpression(c1.Expression.Type, alias, c1.Name), c2.Expression))
                     .AggregateAnd();
 
@@ -1127,12 +1131,7 @@ private Expression BindGroupBy(Type resultType, Expression source, LambdaExpress
             Expression resultExpr = Expression.Convert(newResult
                 , typeof(IGrouping<,>).MakeGenericType(key.Type, subqueryElemExpr.Type));
 
-            this.groupByMap.Add(elementAlias, new GroupByInfo
-            {
-                GroupAlias = alias,
-                Projector = elemExpr,
-                Source = select,
-            });
+            this.groupByMap.Add(elementAlias, new GroupByInfo(alias, elemExpr, select));
 
             var result = new ProjectionExpression(
                 new SelectExpression(alias, false, null, keyPC.Columns, select, null, null, keyPC.Columns.Select(c => c.Expression), 0),
@@ -1163,9 +1162,14 @@ class ColumnReplacerVisitor : DbExpressionVisitor
         {
             Dictionary<ColumnExpression, ColumnExpression> Replacements;
 
+            public ColumnReplacerVisitor(Dictionary<ColumnExpression, ColumnExpression> replacements)
+            {
+                Replacements = replacements;
+            }
+
             public static Expression ReplaceColumns(Dictionary<ColumnExpression, ColumnExpression> replacements, Expression exp)
             {
-                return new ColumnReplacerVisitor { Replacements = replacements }.Visit(exp);
+                return new ColumnReplacerVisitor(replacements).Visit(exp);
             }
 
             protected internal override Expression VisitColumn(ColumnExpression column)
@@ -1175,10 +1179,10 @@ protected internal override Expression VisitColumn(ColumnExpression column)
         }
 
 
-        List<OrderExpression> thenBys;
+        List<OrderExpression>? thenBys;
         protected virtual Expression BindOrderBy(Type resultType, Expression source, LambdaExpression orderSelector, OrderType orderType)
         {
-            List<OrderExpression> myThenBys = this.thenBys;
+            List<OrderExpression>? myThenBys = this.thenBys;
             this.thenBys = null;
             ProjectionExpression projection = this.VisitCastProjection(source);
 
@@ -1227,17 +1231,17 @@ private Expression GetOrderExpression(LambdaExpression lambda, ProjectionExpress
                 {
                     expr = ((MethodCallExpression)expr).Arguments[0];
                 }
-                else if (expr.Type == typeof(Type))
+                else if (expr!/*CSBUG*/.Type == typeof(Type))
                 {
-                    expr = ExtractTypeId(expr);
+                    expr = ExtractTypeId(expr!/*CSBUG*/);
                 }
 
-                if (expr.Type.UnNullify() == typeof(PrimaryKey))
+                if (expr!/*CSBUG*/.Type.UnNullify() == typeof(PrimaryKey))
                 {
-                    expr = SmartEqualizer.UnwrapPrimaryKey(expr);
+                    expr = SmartEqualizer.UnwrapPrimaryKey(expr!/*CSBUG*/);
                 }
 
-                return DbExpressionNominator.FullNominate(expr);
+                return DbExpressionNominator.FullNominate(expr)!;
             }
         }
 
@@ -1255,13 +1259,13 @@ protected virtual Expression BindThenBy(Expression source, LambdaExpression orde
 
         private bool IsTable(Expression expression)
         {
-            ConstantExpression c = expression as ConstantExpression;
+            ConstantExpression? c = expression as ConstantExpression;
             return c != null && IsTable(c.Value);
         }
 
         public bool IsTable(object value)
         {
-            IQueryable query = value as IQueryable;
+            IQueryable? query = value as IQueryable;
             if (query == null)
                 return false;
 
@@ -1350,7 +1354,7 @@ protected override Expression VisitConstant(ConstantExpression c)
 
         static bool IsNewId(Expression expression)
         {
-            ConstantExpression ce = expression as ConstantExpression;
+            ConstantExpression? ce = expression as ConstantExpression;
             return ce != null && ce.Type.UnNullify() == typeof(int) && int.MinValue.Equals(ce.Value);
         }
 
@@ -1372,10 +1376,10 @@ protected override MemberAssignment VisitMemberAssignment(MemberAssignment assig
             return assignment;
         }
 
-        protected override Expression VisitMember(MemberExpression m)
+        protected override Expression? VisitMember(MemberExpression m)
         {
             Expression ex = base.VisitMember(m);
-            Expression binded = BindMemberAccess((MemberExpression)ex);
+            Expression? binded = BindMemberAccess((MemberExpression)ex);
             return binded;
         }
 
@@ -1401,7 +1405,7 @@ public Expression BindMethodCall(MethodCallExpression m)
             if (ExpressionCleaner.HasExpansions(source.Type, m.Method) && source is EntityExpression) //new expansions discovered
             {
                 Dictionary<ParameterExpression, Expression> replacements = new Dictionary<ParameterExpression, Expression>();
-                Func<Expression, ParameterInfo, Expression> replace = (e, pi) =>
+                Func<Expression, ParameterInfo?, Expression> replace = (e, pi) =>
                 {
                     if (e == null || e.NodeType == ExpressionType.Quote || e.NodeType == ExpressionType.Lambda || pi != null && pi.HasAttribute<EagerBindingAttribute>())
                         return e;
@@ -1414,9 +1418,9 @@ public Expression BindMethodCall(MethodCallExpression m)
 
                 MethodCallExpression simple = Expression.Call(replace(m.Object, null), m.Method, m.Arguments.Select((a, i) => replace(a, parameters[i])).ToArray());
 
-                Expression binded = ExpressionCleaner.BindMethodExpression(simple, true);
+                Expression binded = ExpressionCleaner.BindMethodExpression(simple, true)!;
 
-                Expression cleanedSimple = DbQueryProvider.Clean(binded, true, null);
+                Expression cleanedSimple = DbQueryProvider.Clean(binded, true, null)!;
                 map.AddRange(replacements);
                 Expression result = Visit(cleanedSimple);
                 map.RemoveRange(replacements.Keys);
@@ -1456,14 +1460,14 @@ public Expression BindMethodCall(MethodCallExpression m)
 
                     return toStr;
                 }
-                else if (source.NodeType == ExpressionType.Convert && source.Type.UnNullify().IsEnum)
+                else if (source!/*CSBUG*/.NodeType == ExpressionType.Convert && source!/*CSBUG*/.Type.UnNullify().IsEnum)
                 {
-                    var table = Schema.Current.Table(EnumEntity.Generate(source.Type.UnNullify()));
+                    var table = Schema.Current.Table(EnumEntity.Generate(source!/*CSBUG*/.Type.UnNullify()));
 
                     if (table != null)
                     {
-                        var ee = new EntityExpression(EnumEntity.Generate(source.Type.UnNullify()),
-                            new PrimaryKeyExpression(((UnaryExpression)source).Operand.Nullify()), null, null, null, null, null, false);
+                        var ee = new EntityExpression(EnumEntity.Generate(source!/*CSBUG*/.Type.UnNullify()),
+                            new PrimaryKeyExpression(((UnaryExpression)source!/*CSBUG*/).Operand.Nullify()), null, null, null, null, null, false);
 
                         return Completed(ee).GetBinding(EntityExpression.ToStrField);
                     }
@@ -1488,7 +1492,7 @@ public Expression BindMethodCall(MethodCallExpression m)
             if(m.Method.DeclaringType == typeof(SystemTimeExtensions) && m.Method.Name.StartsWith(nameof(SystemTimeExtensions.SystemPeriod)))
             {
                 var tablePeriod =
-                    source is EntityExpression e ? Completed(e).Let(ec => ec.TablePeriod ?? ec.Table.GenerateSystemPeriod(ec.TableAlias, this, force: true)) :
+                    source is EntityExpression e ? Completed(e).Let(ec => ec.TablePeriod ?? ec.Table.GenerateSystemPeriod(ec.TableAlias!, this, force: true)) :
                     source is MListElementExpression mle ? mle.TablePeriod ?? mle.Table.GenerateSystemPeriod(mle.Alias, this, force: true) :
                     throw new InvalidOperationException("Unexpected source");
 
@@ -1521,7 +1525,7 @@ private ConditionalExpression DispatchConditional(MethodCallExpression m, Expres
         static readonly PropertyInfo piIdClass = ReflectionTools.GetPropertyInfo((Entity e) => e.Id);
         static readonly PropertyInfo piIdInterface = ReflectionTools.GetPropertyInfo((IEntity e) => e.Id);
 
-        public Expression BindMemberAccess(MemberExpression m)
+        public Expression? BindMemberAccess(MemberExpression m)
         {
             Expression source = m.Expression;
 
@@ -1547,11 +1551,11 @@ public Expression BindMemberAccess(MemberExpression m)
                 ParameterExpression parameter = Expression.Parameter(m.Expression.Type, "temp");
                 MemberExpression simple = Expression.MakeMemberAccess(parameter, m.Member);
 
-                Expression binded = ExpressionCleaner.BindMemberExpression(simple, true);
+                Expression? binded = ExpressionCleaner.BindMemberExpression(simple, true);
 
-                Expression cleanedSimple = DbQueryProvider.Clean(binded, true, null);
+                Expression? cleanedSimple = DbQueryProvider.Clean(binded, true, null);
                 map.Add(parameter, source);
-                Expression result = Visit(cleanedSimple);
+                Expression? result = Visit(cleanedSimple);
                 map.Remove(parameter);
                 return result;
             }
@@ -1569,7 +1573,7 @@ public Expression BindMemberAccess(MemberExpression m)
                 }
             }
 
-            source = RemoveProjectionConvert(source);
+            source = RemoveProjectionConvert(source!/*CSBUG*/);
 
             switch (source.NodeType)
             {
@@ -1621,7 +1625,7 @@ public Expression BindMemberAccess(MemberExpression m)
                                         if (pi != null && ReflectionTools.PropertyEquals(pi, EntityExpression.IdOrNullProperty))
                                             return ee.ExternalId;
 
-                                        FieldInfo fi = m.Member as FieldInfo ?? Reflector.TryFindFieldInfo(ee.Type, pi);
+                                        FieldInfo? fi = m.Member as FieldInfo ?? Reflector.TryFindFieldInfo(ee.Type, pi!);
 
                                         if (fi == null)
                                             throw new InvalidOperationException("The member {0} of {1} is not accessible on queries".FormatWith(m.Member.Name, ee.Type.TypeName()));
@@ -1642,8 +1646,7 @@ public Expression BindMemberAccess(MemberExpression m)
                                 case DbExpressionType.EmbeddedInit:
                                     {
                                         EmbeddedEntityExpression eee = (EmbeddedEntityExpression)source;
-                                        FieldInfo fi = m.Member as FieldInfo ?? Reflector.TryFindFieldInfo(eee.Type, (PropertyInfo)m.Member);
-
+                                        FieldInfo? fi = m.Member as FieldInfo ?? Reflector.TryFindFieldInfo(eee.Type, (PropertyInfo)m.Member);
                                         if (fi == null)
                                             throw new InvalidOperationException("The member {0} of {1} is not accesible on queries".FormatWith(m.Member.Name, eee.Type.TypeName()));
 
@@ -1661,9 +1664,9 @@ public Expression BindMemberAccess(MemberExpression m)
                                     {
                                         MixinEntityExpression mee = (MixinEntityExpression)source;
 
-                                        PropertyInfo pi = m.Member as PropertyInfo;
+                                        PropertyInfo pi = (PropertyInfo)m.Member;
                                         if (pi.Name == "MainEntity")
-                                            return mee.FieldMixin.MainEntityTable.GetProjectorExpression(mee.MainEntityAlias, this);
+                                            return mee.FieldMixin!.MainEntityTable.GetProjectorExpression(mee.MainEntityAlias!, this);
 
                                         FieldInfo fi = m.Member as FieldInfo ?? Reflector.FindFieldInfo(mee.Type, (PropertyInfo)m.Member);
 
@@ -1683,18 +1686,17 @@ public Expression BindMemberAccess(MemberExpression m)
                                 case DbExpressionType.LiteReference:
                                     {
                                         LiteReferenceExpression liteRef = (LiteReferenceExpression)source;
-                                        PropertyInfo pi = m.Member as PropertyInfo;
+                                        PropertyInfo? pi = m.Member as PropertyInfo;
                                         if (pi != null)
                                         {
                                             if (pi.Name == "Id")
                                                 return BindMemberAccess(Expression.Property(liteRef.Reference, liteRef.Reference.Type.IsInterface ? piIdInterface : piIdClass));
                                             if (pi.Name == "EntityOrNull" || pi.Name == "Entity")
                                                 return liteRef.Reference;
+                                            if (pi.Name == "EntityType")
+                                                return GetEntityType(liteRef.Reference);
                                         }
 
-                                        if (pi.Name == "EntityType")
-                                            return GetEntityType(liteRef.Reference);
-
                                         throw new InvalidOperationException("The member {0} of Lite is not accessible on queries".FormatWith(m.Member));
                                     }
                                 case DbExpressionType.ImplementedBy:
@@ -1702,7 +1704,7 @@ public Expression BindMemberAccess(MemberExpression m)
                                         var ib = (ImplementedByExpression)source;
 
                                         return DispatchIb(ib, m.Member.ReturningType(), ee =>
-                                            BindMemberAccess(Expression.MakeMemberAccess(ee, m.Member)));
+                                            BindMemberAccess(Expression.MakeMemberAccess(ee, m.Member))!);
                                     }
                                 case DbExpressionType.ImplementedByAll:
                                     {
@@ -1804,7 +1806,7 @@ private Expression CombineImplementations(ICombineStrategy strategy, Dictionary<
             if (expressions.All(e => e.Value is LiteReferenceExpression))
             {
                 Expression entity = CombineImplementations(strategy, expressions.SelectDictionary(ex =>
-                    ((LiteReferenceExpression)ex).Reference), Lite.Extract(returnType));
+                    ((LiteReferenceExpression)ex).Reference), Lite.Extract(returnType)!);
 
                 return MakeLite(entity, null);
             }
@@ -1966,7 +1968,7 @@ internal static PrimaryKeyExpression ExtractTypeId(Expression exp)
                     TypeConstant(imp.Key).Nullify(), acum)));
             }
 
-            throw new InvalidOperationException("Impossible to extract TypeId from {0}".FormatWith(exp.ToString()));
+            throw new InvalidOperationException("Impossible to extract TypeId from {0}".FormatWith(exp!/*CSBUG*/.ToString()));
         }
 
         protected override Expression VisitInvocation(InvocationExpression iv)
@@ -2080,7 +2082,7 @@ public Expression SimplifyRedundandConverts(UnaryExpression unary)
             return unary;
         }
 
-        private Expression EntityCasting(Expression operand, Type uType)
+        private Expression? EntityCasting(Expression? operand, Type uType)
         {
             if (operand == null)
                 return null;
@@ -2138,7 +2140,7 @@ private Expression EntityCasting(Expression operand, Type uType)
                 if (!uType.IsLite())
                     throw new InvalidCastException("Impossible to convert an expression of type {0} to {1}".FormatWith(lite.Type.TypeName(), uType.TypeName()));
 
-                Expression entity = EntityCasting(lite.Reference, Lite.Extract(uType));
+                Expression entity = EntityCasting(lite.Reference, Lite.Extract(uType)!)!;
 
                 return MakeLite(entity, lite.CustomToStr);
             }
@@ -2208,19 +2210,21 @@ internal CommandExpression BindDelete(Expression source)
             }
             else if (pr.Projector is EmbeddedEntityExpression eee)
             {
-                Expression id = eee.ViewTable.GetIdExpression(aliasGenerator.Table(eee.ViewTable.Name));
+                var vn = eee.ViewTable!;
+
+                Expression id = vn.GetIdExpression(aliasGenerator.Table(vn.Name));
 
-                commands.Add(new DeleteExpression(eee.ViewTable, false, pr.Select, SmartEqualizer.EqualNullable(id, eee.GetViewId())));
+                commands.Add(new DeleteExpression(vn, false, pr.Select, SmartEqualizer.EqualNullable(id, eee.GetViewId())));
             }
             else
-                throw new InvalidOperationException("Delete not supported for {0}".FormatWith(pr.Projector.GetType().TypeName()));
+                throw new InvalidOperationException("Delete not supported for {0}".FormatWith(pr.Projector!/*CSBUG*/.GetType().TypeName()));
 
             commands.Add(new SelectRowCountExpression());
 
             return new CommandAggregateExpression(commands);
         }
 
-        internal CommandExpression BindUpdate(Expression source, LambdaExpression partSelector, IEnumerable<SetterExpressions> setterExpressions)
+        internal CommandExpression BindUpdate(Expression source, LambdaExpression? partSelector, IEnumerable<SetterExpressions> setterExpressions)
         {
             ProjectionExpression pr = VisitCastProjection(source);
 
@@ -2229,16 +2233,16 @@ internal CommandExpression BindUpdate(Expression source, LambdaExpression partSe
                 entity = pr.Projector;
             else
             {
-                var cleanedSelector = (LambdaExpression)DbQueryProvider.Clean(partSelector, false, null);
+                var cleanedSelector = (LambdaExpression)DbQueryProvider.Clean(partSelector, false, null)!;
 
                 entity = MapVisitExpand(cleanedSelector, pr);
             }
 
             ITable table =
                 entity is EntityExpression entEx ? (ITable)entEx.Table :
-                entity is EmbeddedEntityExpression eeEx ? (ITable)eeEx.ViewTable:
-                entity is MListElementExpression mlistEx ? (ITable)mlistEx.Table :
-                throw new InvalidOperationException();
+                entity is EmbeddedEntityExpression eeEx ? (ITable)eeEx.ViewTable!:
+                entity is MListElementExpression mlistEx ? (ITable)mlistEx.Table!:
+                throw new UnexpectedValueException(entity!/*CSBUG*/);
 
             Alias alias = aliasGenerator.Table(table.Name);
 
@@ -2247,7 +2251,7 @@ internal CommandExpression BindUpdate(Expression source, LambdaExpression partSe
                 ((TableMList)table).GetProjectorExpression(alias, this);
 
             List<ColumnAssignment> assignments = new List<ColumnAssignment>();
-            using (SetCurrentSource(pr.Select.From))
+            using (SetCurrentSource(pr.Select.From!))
             {
                 foreach (var setter in setterExpressions)
                 {
@@ -2261,9 +2265,7 @@ internal CommandExpression BindUpdate(Expression source, LambdaExpression partSe
                     }
                     catch (CurrentSourceNotFoundException e)
                     {
-                        throw new InvalidOperationException("The expression '{0}' can not be used as a propertyExpression. Consider using UnsafeUpdatePart"
-                            .FormatWith(setter.PropertyExpression.ToString()),
-                            e);
+                        throw new InvalidOperationException($"The expression '{setter.PropertyExpression}' can not be used as a propertyExpression. Consider using UnsafeUpdatePart", e);
                     }
 
                     var param = setter.ValueExpression.Parameters.Single();
@@ -2295,13 +2297,13 @@ internal CommandExpression BindUpdate(Expression source, LambdaExpression partSe
             }
             else if (entity is EmbeddedEntityExpression eee)
             {
-                Expression id = eee.ViewTable.GetIdExpression(aliasGenerator.Table(eee.ViewTable.GetName(isHistory)));
+                Expression id = eee.ViewTable!.GetIdExpression(aliasGenerator.Table(eee.ViewTable!.GetName(isHistory)));
 
                 condition = SmartEqualizer.EqualNullable(id, eee.GetViewId());
-                table = eee.ViewTable;
+                table = eee.ViewTable!;
             }
             else
-                throw new InvalidOperationException("Update not supported for {0}".FormatWith(entity.GetType().TypeName()));
+                throw new InvalidOperationException("Update not supported for {0}".FormatWith(entity!/*CSBUG*/.GetType().TypeName()));
 
 
             var result = new CommandAggregateExpression(new CommandExpression[]
@@ -2331,7 +2333,7 @@ internal CommandExpression BindInsert(Expression source, LambdaExpression constr
             {
                 map.Add(param, pr.Projector);
                 map.Add(toInsertParam, toInsert);
-                var cleanedConstructor = DbQueryProvider.Clean(constructor.Body, false, null);
+                var cleanedConstructor = DbQueryProvider.Clean(constructor.Body, false, null)!;
                 FillColumnAssigments(assignments, toInsertParam, cleanedConstructor, e =>
                 {
                     var cleaned = DbQueryProvider.Clean(e, true, null);
@@ -2347,6 +2349,8 @@ internal CommandExpression BindInsert(Expression source, LambdaExpression constr
                 assignments.Add(new ColumnAssignment(entityTable.Ticks.Name, Expression.Constant(0L, typeof(long))));
             }
 
+            table = table!; /*CSBUG*/
+
             var isHistory = this.systemTime is SystemTime.HistoryTable;
 
             var result = new CommandAggregateExpression(new CommandExpression[]
@@ -2463,7 +2467,7 @@ private ColumnAssignment[] Assign(Expression colExpression, Expression expressio
 
                 var bindings = cEmb.Bindings.SelectMany(b => AdaptAssign(b.Binding, expEmb.GetBinding(b.FieldInfo)));
 
-                if (cEmb.FieldEmbedded.HasValue != null)
+                if (cEmb.FieldEmbedded!.HasValue != null)
                 {
                     var setValue = AssignColumn(cEmb.HasValue, expEmb.HasValue);
                     bindings = bindings.PreAnd(setValue);
@@ -2510,7 +2514,7 @@ ColumnAssignment AssignColumn(Expression column, Expression expression)
             if (col == null)
                 throw new InvalidOperationException("{0} does not represent a column".FormatWith(column.ToString()));
 
-            return new ColumnAssignment(col.Name, DbExpressionNominator.FullNominate(expression));
+            return new ColumnAssignment(col.Name, DbExpressionNominator.FullNominate(expression)!);
         }
         #region BinderTools
 
@@ -2519,21 +2523,18 @@ public UnionAllRequest Completed(ImplementedByExpression ib)
         {
             return implementedByReplacements.GetOrCreate(ib, () =>
             {
-                UnionAllRequest result = new UnionAllRequest(ib)
-                {
-                    UnionAlias = aliasGenerator.NextTableAlias("Union" + ib.Type.Name),
-
-                    Implementations = ib.Implementations.SelectDictionary(k => k, ee =>
+                UnionAllRequest result = new UnionAllRequest(ib, 
+                    unionAlias: aliasGenerator.NextTableAlias("Union" + ib.Type.Name),
+                    implementations: ib.Implementations.SelectDictionary(k => k, ee =>
                     {
                         var alias = NextTableAlias(ee.Table.Name);
 
-                        return new UnionEntity
-                        {
-                            Table = new TableExpression(alias, ee.Table, ee.Table.SystemVersioned != null ? this.systemTime : null, null),
-                            Entity = (EntityExpression)ee.Table.GetProjectorExpression(alias, this),
-                        };
+                        return new UnionEntity(
+                            entity: (EntityExpression)ee.Table.GetProjectorExpression(alias, this),
+                            table: new TableExpression(alias, ee.Table, ee.Table.SystemVersioned != null ? this.systemTime : null, null)
+                        );
                     }).ToReadOnly()
-                };
+                );
                 List<Expression> equals = new List<Expression>();
                 foreach (var unionEntity in result.Implementations.Values)
                 {
@@ -2553,9 +2554,9 @@ public UnionAllRequest Completed(ImplementedByExpression ib)
 
         ImmutableStack<SourceExpression> currentSource = ImmutableStack<SourceExpression>.Empty;
 
-        public IDisposable SetCurrentSource(SourceExpression source)
+        public IDisposable SetCurrentSource(SourceExpression? source)
         {
-            this.currentSource = currentSource.Push(source);
+            this.currentSource = currentSource.Push(source!/*CSBUG*/);
             return new Disposable(() => currentSource = currentSource.Pop());
         }
 
@@ -2650,11 +2651,10 @@ public EntityExpression Completed(EntityExpression entity)
 
                 var result = new EntityExpression(entity.Type, entity.ExternalId, entity.ExternalPeriod, newAlias, bindings, mixins, period, avoidExpandOnRetrieving: false);
 
-                AddRequest(new TableRequest
-                {
-                    CompleteEntity = result,
-                    Table = new TableExpression(newAlias, table, table.SystemVersioned != null ? this.systemTime : null, null),
-                });
+                AddRequest(new TableRequest(
+                    table: new TableExpression(newAlias, table, table.SystemVersioned != null ? this.systemTime : null, null),
+                    completeEntity: result
+                ));
 
                 return result;
             });
@@ -2671,7 +2671,7 @@ internal static PrimaryKeyExpression NullId(Type type)
             return new PrimaryKeyExpression(new SqlConstantExpression(null, type.Nullify()));
         }
 
-        public Expression MakeLite(Expression entity, Expression customToStr)
+        public Expression MakeLite(Expression entity, Expression? customToStr)
         {
             return new LiteReferenceExpression(Lite.Generate(entity.Type), entity, customToStr, false, false);
         }
@@ -2690,6 +2690,8 @@ public PrimaryKeyExpression GetId(Expression expression)
                 return aggregate;
             }
 
+            expression = expression!;/*CSBUG*/
+
             if (expression.NodeType == ExpressionType.Conditional)
             {
                 var con = (ConditionalExpression)expression;
@@ -2730,8 +2732,10 @@ public Expression GetIdString(Expression expression)
                 return aggregate;
             }
 
-            if (expression is ImplementedByAllExpression)
-                return ((ImplementedByAllExpression)expression).Id;
+            if (expression is ImplementedByAllExpression iba)
+                return iba.Id;
+
+            expression = expression!; /*CSBUG*/
 
             if (expression.NodeType == ExpressionType.Conditional)
             {
@@ -2772,11 +2776,12 @@ public Expression GetEntityType(Expression expression)
                 return new TypeImplementedByExpression(ib.Implementations.SelectDictionary(k => k, v => v.ExternalId));
             }
 
-            if (expression is ImplementedByAllExpression)
+            if (expression is ImplementedByAllExpression iba)
             {
-                return ((ImplementedByAllExpression)expression).TypeId;
+                return iba.TypeId;
             }
 
+            expression = expression!; /*CSBUG*/
             if (expression.NodeType == ExpressionType.Conditional)
             {
                 var con = (ConditionalExpression)expression;
@@ -2850,14 +2855,14 @@ internal ProjectionExpression MListProjection(MListExpression mle, bool withRowI
             return proj;
         }
 
-        internal Expression BindAdditionalField(AdditionalFieldExpression af, bool entityCompleter)
+        internal Expression? BindAdditionalField(AdditionalFieldExpression af, bool entityCompleter)
         {
             var lambda = Schema.Current.GetAdditionalQueryBinding(af.Route, entityCompleter);
 
             if (lambda == null)
                 return null;
 
-            var cleanLambda = (LambdaExpression)DbQueryProvider.Clean(lambda, filter: true, log: null);
+            var cleanLambda = (LambdaExpression)DbQueryProvider.Clean(lambda, filter: true, log: null)!;
 
             var parentEntity = new EntityExpression(af.Route.RootType, af.BackID, af.ExternalPeriod, null, null, null, null, false);
 
@@ -2936,6 +2941,12 @@ class UniqueRequest : ExpansionRequest
         public bool OuterApply;
         public SelectExpression Select;
 
+        public UniqueRequest(SelectExpression select, bool outerApply)
+        {
+            OuterApply = outerApply;
+            Select = select;
+        }
+
         public override string ToString()
         {
             return base.ToString() + (OuterApply ? " OUTER APPLY" : " CROSS APPLY") + " with " + Select.ToString();
@@ -2960,6 +2971,12 @@ class TableRequest : ExpansionRequest
         public TableExpression Table;
         public EntityExpression CompleteEntity;
 
+        public TableRequest(TableExpression table, EntityExpression completeEntity)
+        {
+            Table = table;
+            CompleteEntity = completeEntity;
+        }
+
         public override string ToString()
         {
             return base.ToString() + " LEFT OUTER JOIN with " + Table.ToString();
@@ -2983,9 +3000,11 @@ class UnionAllRequest : ExpansionRequest, QueryBinder.ICombineStrategy
 
         Dictionary<string, Dictionary<Type, Expression>> declarations = new Dictionary<string, Dictionary<Type, Expression>>();
 
-        public UnionAllRequest(ImplementedByExpression ib)
+        public UnionAllRequest(ImplementedByExpression ib, Alias unionAlias, ReadOnlyDictionary<Type, UnionEntity> implementations)
         {
             this.OriginalImplementedBy = ib;
+            this.UnionAlias = unionAlias;
+            this.Implementations = implementations;
         }
 
         public override string ToString()
@@ -3032,7 +3051,7 @@ public Expression CombineValues(Dictionary<Type, Expression> implementations, Ty
             {
                 var union = Implementations[kvp.Key].UnionExternalId;
 
-                var condition = Expression.NotEqual(union, QueryBinder.NullId(union.ValueType));
+                var condition = Expression.NotEqual(union, QueryBinder.NullId(union!.ValueType));
 
                 if (kvp.Value is Expression exp)
                 {
@@ -3077,7 +3096,7 @@ object GetNominableExpression(Type type, Expression exp)
             if (nominations.Contains(newExp))
                 return newExp;
 
-            return new DityExpression { projector = newExp, candidates = nominations };
+            return new DityExpression(projector : newExp, candidates : nominations);
 
         }
 
@@ -3085,14 +3104,26 @@ class DityExpression
         {
             public Expression projector;
             public HashSet<Expression> candidates;
+
+            public DityExpression(Expression projector, HashSet<Expression> candidates)
+            {
+                this.projector = projector;
+                this.candidates = candidates;
+            }
         }
     }
 
     class UnionEntity
     {
-        public PrimaryKeyExpression UnionExternalId;
+        public PrimaryKeyExpression? UnionExternalId;
         public EntityExpression Entity;
         public TableExpression Table;
+
+        public UnionEntity(EntityExpression entity, TableExpression table)
+        {
+            Entity = entity;
+            Table = table;
+        }
     }
 
     class QueryJoinExpander : DbExpressionVisitor
@@ -3100,16 +3131,18 @@ class QueryJoinExpander : DbExpressionVisitor
         Dictionary<SourceExpression, List<ExpansionRequest>> requests;
         AliasGenerator aliasGenerator;
 
+        public QueryJoinExpander(Dictionary<SourceExpression, List<ExpansionRequest>> requests, AliasGenerator aliasGenerator)
+        {
+            this.requests = requests;
+            this.aliasGenerator = aliasGenerator;
+        }
+
         public static Expression ExpandJoins(Expression expression, QueryBinder binder, bool cleanRequests)
         {
             if (binder.requests.IsEmpty())
                 return expression;
 
-            QueryJoinExpander expander = new QueryJoinExpander
-            {
-                requests = binder.requests,
-                aliasGenerator = binder.aliasGenerator,
-            };
+            QueryJoinExpander expander = new QueryJoinExpander(binder.requests, binder.aliasGenerator);
 
             var result = expander.Visit(expression);
 
@@ -3127,9 +3160,6 @@ public static Expression ExpandJoins(Expression expression, QueryBinder binder,
 
         protected internal override SourceExpression VisitSource(SourceExpression source)
         {
-            if (source == null)
-                return null;
-
             var reqs = requests.TryGetC(source);
 
             //if (reqs != null)
@@ -3147,40 +3177,34 @@ SourceExpression ApplyExpansions(SourceExpression source, List<ExpansionRequest>
         {
             foreach (var r in expansions)
             {
-                if (r is TableRequest)
+                if (r is TableRequest tr)
                 {
-                    TableRequest tr = r as TableRequest;
-
                     var eq = SmartEqualizer.EqualNullable(tr.CompleteEntity.ExternalId, tr.CompleteEntity.GetBinding(EntityExpression.IdField))
                         .And(tr.CompleteEntity.ExternalPeriod.Overlaps(tr.CompleteEntity.TablePeriod));
 
-                    Expression equal = DbExpressionNominator.FullNominate(eq);
+                    Expression equal = DbExpressionNominator.FullNominate(eq)!;
                     source = new JoinExpression(JoinType.SingleRowLeftOuterJoin, source, tr.Table, equal);
                 }
-                else if (r is UniqueRequest)
+                else if (r is UniqueRequest ur)
                 {
-                    UniqueRequest ur = (UniqueRequest)r;
-
-                    var newSelect = (SourceExpression)VisitSource(ur.Select);
+                    var newSelect = VisitSource(ur.Select);
 
                     source = new JoinExpression(ur.OuterApply ? JoinType.OuterApply : JoinType.CrossApply, source, newSelect, null);
                 }
-                else
+                else if(r is UnionAllRequest ua)
                 {
-                    UnionAllRequest ur = (UnionAllRequest)r;
-
-                    var unionAll = ur.Implementations.Select(ue =>
+                    var unionAll = ua.Implementations.Select(ue =>
                     {
-                        var table = (SourceExpression)VisitSource(ue.Value.Table);
+                        var table = VisitSource(ue.Value.Table)!;
 
-                        var columns = ur.GetDeclarations(ue.Key);
+                        var columns = ua.GetDeclarations(ue.Key);
 
                         return new SelectExpression(aliasGenerator.NextSelectAlias(), false, null, columns, table, null, null, null, 0);
-                    }).Aggregate<SourceWithAliasExpression>((a, b) => new SetOperatorExpression(SetOperator.UnionAll, a, b, ur.UnionAlias));
+                    }).Aggregate<SourceWithAliasExpression>((a, b) => new SetOperatorExpression(SetOperator.UnionAll, a, b, ua.UnionAlias));
 
-                    var condition = (from imp in ur.Implementations
+                    var condition = (from imp in ua.Implementations
                                      let uid = imp.Value.UnionExternalId
-                                     let eid = ur.OriginalImplementedBy.Implementations[imp.Key].ExternalId
+                                     let eid = ua.OriginalImplementedBy.Implementations[imp.Key].ExternalId
                                      select Expression.Or(
                                      SmartEqualizer.EqualNullable(uid, eid),
                                      Expression.And(new IsNullExpression(uid), new IsNullExpression(eid))))
@@ -3189,14 +3213,14 @@ select Expression.Or(
                     source = new JoinExpression(JoinType.SingleRowLeftOuterJoin, source, unionAll, condition);
                 }
 
-                r.Consumed = true;
+                r!/*CSBUG*/.Consumed = true;
             }
             return source;
         }
 
         protected internal override Expression VisitProjection(ProjectionExpression proj)
         {
-            SourceExpression source = (SourceExpression)this.VisitSource(proj.Select);
+            SourceExpression source = this.VisitSource(proj.Select);
             Expression projector = this.Visit(proj.Projector);
 
             if (source == proj.Select && projector == proj.Projector)
@@ -3228,7 +3252,7 @@ protected internal override Expression VisitUpdate(UpdateExpression update)
 
         protected internal override Expression VisitInsertSelect(InsertSelectExpression insertSelect)
         {
-            var source = VisitSource(insertSelect.Source);
+            var source = VisitSource(insertSelect.Source)!;
             var assigments = Visit(insertSelect.Assigments, VisitColumnAssigment);
             if (source != insertSelect.Source || assigments != insertSelect.Assigments)
             {
@@ -3251,9 +3275,14 @@ class AssignAdapterExpander : DbExpressionVisitor
     {
         Expression colExpression;
 
+        public AssignAdapterExpander(Expression colExpression)
+        {
+            this.colExpression = colExpression;
+        }
+
         public static Expression Adapt(Expression exp, Expression colExpression)
         {
-            return new AssignAdapterExpander { colExpression = colExpression }.Visit(exp);
+            return new AssignAdapterExpander (colExpression).Visit(exp);
         }
 
         protected override Expression VisitConditional(ConditionalExpression c)
@@ -3268,7 +3297,7 @@ protected override Expression VisitConditional(ConditionalExpression c)
                 {
                     using (this.OverrideColExpression(col.Reference))
                     {
-                        var entity = CombineConditional(test, l.Reference, r.Reference);
+                        var entity = CombineConditional(test, l.Reference, r.Reference)!;
                         return new LiteReferenceExpression(Lite.Generate(entity.Type), entity, null, false, false);
                     }
                 });
@@ -3277,7 +3306,7 @@ protected override Expression VisitConditional(ConditionalExpression c)
             return CombineConditional(test, ifTrue, ifFalse) ?? c;
         }
 
-        private Expression CombineConditional(Expression test, Expression ifTrue, Expression ifFalse)
+        private Expression? CombineConditional(Expression test, Expression ifTrue, Expression ifFalse)
         {
             if (colExpression is EntityExpression)
                 return Combiner<EntityExpression>(ifTrue, ifFalse, (col, t, f) =>
@@ -3327,8 +3356,8 @@ protected override Expression VisitBinary(BinaryExpression b)
                     {
                         using (this.OverrideColExpression(col.Reference))
                         {
-                            var entity = CombineCoalesce(l.Reference, r.Reference);
-                            return new LiteReferenceExpression(Lite.Generate(entity.Type), entity, null, false, false);
+                            var entity = CombineCoalesce(l.Reference, r.Reference)!;
+                            return new LiteReferenceExpression(Lite.Generate(entity!.Type), entity, null, false, false);
                         }
                     });
                 }
@@ -3385,7 +3414,7 @@ protected override Expression VisitUnary(UnaryExpression node)
             }
         }
 
-        private Expression CombineCoalesce(Expression left, Expression right)
+        private Expression? CombineCoalesce(Expression left, Expression right)
         {
             if (colExpression is EntityExpression)
                 return Combiner<EntityExpression>(left, right, (col, l, r) =>
@@ -3589,7 +3618,7 @@ internal EmbeddedEntityExpression EmbeddedFromConstant(ConstantExpression contan
 
             var embedded = (EmbeddedEntityExpression)colExpression;
 
-            var bindings = (from kvp in embedded.FieldEmbedded.EmbeddedFields
+            var bindings = (from kvp in embedded.FieldEmbedded!.EmbeddedFields
                             let fi = kvp.Value.FieldInfo
                             let bind = embedded.GetBinding(fi)
                             select GetBinding(fi, value == null ?
@@ -3611,7 +3640,7 @@ protected override Expression VisitMemberInit(MemberInitExpression init)
 
             var embedded = (EmbeddedEntityExpression)colExpression;
 
-            var bindings = (from kvp in embedded.FieldEmbedded.EmbeddedFields
+            var bindings = (from kvp in embedded.FieldEmbedded!.EmbeddedFields
                             let fi = kvp.Value.FieldInfo
                             select new FieldBinding(fi,
                                 fi.FieldType.IsValueType && !fi.FieldType.IsNullable() ? dic.GetOrThrow(fi.Name, "No value defined for non-nullable field {0}") :
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs
index 5c37114a59..5d61ea352d 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using Signum.Utilities.ExpressionTrees;
 using System.Linq.Expressions;
@@ -95,7 +95,7 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
         }
 
 
-        internal static Expression Filter(Expression expression, bool filter)
+        internal static Expression? Filter(Expression? expression, bool filter)
         {
             return new QueryFilterer { filter = filter }.Visit(expression);
         }
diff --git a/Signum.Engine/Patterns/VirtualMList.cs b/Signum.Engine/Patterns/VirtualMList.cs
index 8a4981331d..c35f6548f7 100644
--- a/Signum.Engine/Patterns/VirtualMList.cs
+++ b/Signum.Engine/Patterns/VirtualMList.cs
@@ -1,4 +1,4 @@
-using Signum.Engine.Maps;
+using Signum.Engine.Maps;
 using Signum.Engine.Operations;
 using Signum.Entities;
 using Signum.Entities.Reflection;
@@ -22,7 +22,7 @@ public static class VirtualMList
         public static bool ShouldAvoidMListType(Type elementType)
         {
             var stack = avoidTypes.Value;
-            return (stack != null && (stack.Contains(elementType) || stack.Contains(null)));
+            return (stack != null && (stack.Contains(elementType) || stack.Contains(typeof(object))));
         }
 
         public static bool IsVirtualMList(this PropertyRoute pr)
@@ -43,7 +43,7 @@ public static IDisposable AvoidMListType(Type elementType)
         public static bool ShouldConsiderNew(Type parentType)
         {
             var stack = considerNewTypes.Value;
-            return (stack != null && (stack.Contains(parentType) || stack.Contains(null)));
+            return (stack != null && (stack.Contains(parentType) || stack.Contains(typeof(object))));
         }
 
         /// <param name="parentType">Use null for every type</param>
@@ -77,8 +77,8 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
         public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
             Expression<Func<T, MList<L>>> mListField,
             Expression<Func<L, Lite<T>>> backReference,
-            Action<L, T> onSave = null,
-            Action<L, T> onRemove = null,
+            Action<L, T>? onSave = null,
+            Action<L, T>? onRemove = null,
             bool? lazyRetrieve = null,
             bool? lazyDelete = null) //To avoid StackOverflows
             where T : Entity
@@ -94,7 +94,7 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
                 lazyDelete = (typeof(L) == typeof(T));
 
             Func<T, MList<L>> getMList = GetAccessor(mListField);
-            Action<L, Lite<T>> setter = null;
+            Action<L, Lite<T>>? setter = null;
             bool preserveOrder = fi.SchemaBuilder.Settings.FieldAttributes(mListPropertRoute)
                 .OfType<PreserveOrderAttribute>()
                 .Any();
@@ -204,7 +204,7 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
                     if(onRemove == null)
                         query.Where(p => !oldElements.Contains(p)).UnsafeDelete();
                     else
-                        query.Where(p => !oldElements.Contains(p)).ToList().ForEach(line => onRemove(line, e));
+                        query.Where(p => !oldElements.Contains(p)).ToList().ForEach(line => onRemove!(line, e));
                 }
 
                 if (mlist != null)
@@ -218,7 +218,7 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
                         if (onSave == null)
                             mlist.SaveList();
                         else
-                            mlist.ForEach(line => { if (GraphExplorer.IsGraphModified(line)) onSave(line, e); });
+                            mlist.ForEach(line => { if (GraphExplorer.IsGraphModified(line)) onSave!(line, e); });
 
                         var priv = (IMListPrivate)mlist;
                         for (int i = 0; i < mlist.Count; i++)
@@ -257,12 +257,12 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
         public static FluentInclude<T> WithVirtualMListInitializeOnly<T, L>(this FluentInclude<T> fi,
             Expression<Func<T, MList<L>>> mListField,
             Expression<Func<L, Lite<T>>> backReference,
-            Action<L, T> onSave = null)
+            Action<L, T>? onSave = null)
             where T : Entity
             where L : Entity
         {
             Func<T, MList<L>> getMList = GetAccessor(mListField);
-            Action<L, Lite<T>> setter = null;
+            Action<L, Lite<T>>? setter = null;
             var sb = fi.SchemaBuilder;
 
             sb.Schema.EntityEvents<T>().RegisterBinding(mListField,
@@ -302,7 +302,11 @@ public static FluentInclude<T> WithVirtualMListInitializeOnly<T, L>(this FluentI
                 if (onSave == null)
                     mlist.SaveList();
                 else
-                    mlist.ForEach(line => { if (GraphExplorer.IsGraphModified(line)) onSave(line, e); });
+                    mlist.ForEach(line =>
+                    {
+                        if (GraphExplorer.IsGraphModified(line))
+                            onSave!(line, e);
+                    });
                 var priv = (IMListPrivate)mlist;
                 for (int i = 0; i < mlist.Count; i++)
                 {
@@ -338,7 +342,7 @@ private static Expression SafeAccess(ParameterExpression param, MemberExpression
                 );
         }
 
-        public static Action<L, Lite<T>> CreateSetter<T, L>(Expression<Func<L, Lite<T>>> getBackReference)
+        public static Action<L, Lite<T>>? CreateSetter<T, L>(Expression<Func<L, Lite<T>>> getBackReference)
             where T : Entity
             where L : Entity
         {
diff --git a/Signum.Engine/Schema/EntityEvents.cs b/Signum.Engine/Schema/EntityEvents.cs
index b0a610a85e..a7b2047402 100644
--- a/Signum.Engine/Schema/EntityEvents.cs
+++ b/Signum.Engine/Schema/EntityEvents.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -19,7 +19,7 @@ public class EntityEvents<T> : IEntityEvents
         public event AlternativeRetriveEventHandler<T> AlternativeRetrive;
         public event RetrievedEventHandler<T> Retrieved;
 
-        public CacheControllerBase<T> CacheController { get; set; }
+        public CacheControllerBase<T>? CacheController { get; set; }
 
         public event FilterQueryEventHandler<T> FilterQuery;
 
@@ -31,10 +31,10 @@ public class EntityEvents<T> : IEntityEvents
         public event PreUnsafeInsertHandler<T> PreUnsafeInsert;
         public event BulkInsetHandler<T> PreBulkInsert;
 
-        public Dictionary<PropertyRoute, IAdditionalBinding> AdditionalBindings { get; private set; }
+        public Dictionary<PropertyRoute, IAdditionalBinding>? AdditionalBindings { get; private set; }
 
         /// <param name="valueFunction">For Caching scenarios</param>
-        public void RegisterBinding<M>(Expression<Func<T, M>> field, Func<bool> shouldSet, Expression<Func<T, M>> valueExpression, Func<T, IRetriever, M> valueFunction = null)
+        public void RegisterBinding<M>(Expression<Func<T, M>> field, Func<bool> shouldSet, Expression<Func<T, M>> valueExpression, Func<T, IRetriever, M>? valueFunction = null)
         {
             if (AdditionalBindings == null)
                 AdditionalBindings = new Dictionary<PropertyRoute, IAdditionalBinding>();
@@ -43,13 +43,7 @@ public void RegisterBinding<M>(Expression<Func<T, M>> field, Func<bool> shouldSe
 
             var pr = PropertyRoute.Construct(field);
 
-            AdditionalBindings.Add(pr, new AdditionalBinding<T, M>
-            {
-                PropertyRoute = pr,
-                ShouldSet = shouldSet,
-                ValueExpression = valueExpression,
-                ValueFunction = valueFunction,
-            });
+            AdditionalBindings.Add(pr, new AdditionalBinding<T, M>(pr, shouldSet, valueExpression, valueFunction));
         }
 
 
@@ -62,9 +56,9 @@ internal IEnumerable<FilterQueryResult<T>> OnFilterQuery()
             return FilterQuery.GetInvocationListTyped().Select(f => f()).ToList();
         }
 
-        internal IDisposable OnPreUnsafeDelete(IQueryable<T> entityQuery)
+        internal IDisposable? OnPreUnsafeDelete(IQueryable<T> entityQuery)
         {
-            IDisposable result = null;
+            IDisposable? result = null;
             if (PreUnsafeDelete != null)
                 foreach (var action in PreUnsafeDelete.GetInvocationListTyped().Reverse())
                     result = Disposable.Combine(result, action(entityQuery));
@@ -72,9 +66,9 @@ internal IDisposable OnPreUnsafeDelete(IQueryable<T> entityQuery)
             return result;
         }
 
-        internal IDisposable OnPreUnsafeMListDelete(IQueryable mlistQuery, IQueryable<T> entityQuery)
+        internal IDisposable? OnPreUnsafeMListDelete(IQueryable mlistQuery, IQueryable<T> entityQuery)
         {
-            IDisposable result = null;
+            IDisposable? result = null;
             if (PreUnsafeMListDelete != null)
                 foreach (var action in PreUnsafeMListDelete.GetInvocationListTyped().Reverse())
                     result = Disposable.Combine(result, action(mlistQuery, entityQuery));
@@ -82,9 +76,9 @@ internal IDisposable OnPreUnsafeMListDelete(IQueryable mlistQuery, IQueryable<T>
             return result;
         }
 
-        IDisposable IEntityEvents.OnPreUnsafeUpdate(IUpdateable update)
+        IDisposable? IEntityEvents.OnPreUnsafeUpdate(IUpdateable update)
         {
-            IDisposable result = null;
+            IDisposable? result = null;
             if (PreUnsafeUpdate != null)
             {
                 var query = update.EntityQuery<T>();
@@ -133,7 +127,7 @@ void IEntityEvents.OnRetrieved(Entity entity)
             Retrieved?.Invoke((T)entity);
         }
 
-        public Entity OnAlternativeRetriving(PrimaryKey id)
+        public Entity? OnAlternativeRetriving(PrimaryKey id)
         {
             if (AlternativeRetrive == null)
                 return null;
@@ -142,7 +136,6 @@ public Entity OnAlternativeRetriving(PrimaryKey id)
 
             AlternativeRetrive(id, args);
 
-
             if (args.Entity == null)
                 throw new EntityNotFoundException(typeof(T), id);
 
@@ -158,7 +151,7 @@ public Entity OnAlternativeRetriving(PrimaryKey id)
 
         }
 
-        ICacheController IEntityEvents.CacheController
+        ICacheController? IEntityEvents.CacheController
         {
             get { return CacheController; }
         }
@@ -178,10 +171,18 @@ public class AdditionalBinding<T, M> : IAdditionalBinding
         public PropertyRoute PropertyRoute { get; set; }
         public Func<bool> ShouldSet { get; set; }
         public Expression<Func<T, M>> ValueExpression { get; set; }
-        public Func<T, IRetriever, M> ValueFunction { get; set; }
+        public Func<T, IRetriever, M>? ValueFunction { get; set; }
         LambdaExpression IAdditionalBinding.ValueExpression => ValueExpression;
 
-        Action<T, M, IRetriever> _setter;
+        Action<T, M, IRetriever>? _setter;
+
+        public AdditionalBinding(PropertyRoute propertyRoute, Func<bool> shouldSet, Expression<Func<T, M>> valueExpression, Func<T, IRetriever, M>? valueFunction)
+        {
+            PropertyRoute = propertyRoute;
+            ShouldSet = shouldSet;
+            ValueExpression = valueExpression;
+            ValueFunction = valueFunction;
+        }
 
         public void SetInMemory(Entity entity, IRetriever retriever) => SetInMemory((T)entity, retriever);
         void SetInMemory(T entity, IRetriever retriever)
@@ -217,17 +218,17 @@ Action<T, M, IRetriever> CreateSetter()
                     retriever.ModifiablePostRetrieving((Modifiable)(object)mlist);
                 };
             }
-            else if (PropertyRoute.Parent.PropertyRouteType == PropertyRouteType.Root)
+            else if (PropertyRoute.Parent!.PropertyRouteType == PropertyRouteType.Root)
             {
-                var setter = ReflectionTools.CreateSetter<T, M>(PropertyRoute.PropertyInfo);
+                var setter = ReflectionTools.CreateSetter<T, M>(PropertyRoute.PropertyInfo!);
 
                 return (e, value, retriever) => setter(e, value);
             }
             else
             {
-                var partGetter = PropertyRoute.Parent.GetLambdaExpression<T, ModifiableEntity>(true).Compile();
+                var partGetter = PropertyRoute.Parent!.GetLambdaExpression<T, ModifiableEntity>(true).Compile();
 
-                var setter = ReflectionTools.CreateSetter<ModifiableEntity, M>(PropertyRoute.PropertyInfo);
+                var setter = ReflectionTools.CreateSetter<ModifiableEntity, M>(PropertyRoute.PropertyInfo!);
 
                 return (e, value, retriever) =>
                 {
@@ -248,9 +249,9 @@ Action<T, M, IRetriever> CreateSetter()
     public delegate FilterQueryResult<T> FilterQueryEventHandler<T>() where T : Entity;
     public delegate void AlternativeRetriveEventHandler<T>(PrimaryKey id, AlternativeRetrieveArgs<T> args) where T : Entity;
 
-    public delegate IDisposable PreUnsafeDeleteHandler<T>(IQueryable<T> entityQuery);
-    public delegate IDisposable PreUnsafeMListDeleteHandler<T>(IQueryable mlistQuery, IQueryable<T> entityQuery);
-    public delegate IDisposable PreUnsafeUpdateHandler<T>(IUpdateable update, IQueryable<T> entityQuery);
+    public delegate IDisposable? PreUnsafeDeleteHandler<T>(IQueryable<T> entityQuery);
+    public delegate IDisposable? PreUnsafeMListDeleteHandler<T>(IQueryable mlistQuery, IQueryable<T> entityQuery);
+    public delegate IDisposable? PreUnsafeUpdateHandler<T>(IUpdateable update, IQueryable<T> entityQuery);
     public delegate LambdaExpression PreUnsafeInsertHandler<T>(IQueryable query, LambdaExpression constructor, IQueryable<T> entityQuery);
     public delegate void BulkInsetHandler<T>(bool inMListTable);
 
@@ -258,7 +259,7 @@ Action<T, M, IRetriever> CreateSetter()
     public class AlternativeRetrieveArgs<T> where T : Entity
     {
         public bool AvoidAccesVerify { get; set; }
-        public T Entity { get; set; }
+        public T? Entity { get; set; }
     }
 
     public class SavedEventArgs
@@ -289,19 +290,19 @@ public FilterQueryResult(Expression<Func<T, bool>> inDatabaseExpression, Func<T,
 
     internal interface IEntityEvents
     {
-        Entity OnAlternativeRetriving(PrimaryKey id);
+        Entity? OnAlternativeRetriving(PrimaryKey id);
         void OnPreSaving(Entity entity, PreSavingContext ctx);
         void OnSaving(Entity entity);
         void OnSaved(Entity entity, SavedEventArgs args);
 
         void OnRetrieved(Entity entity);
 
-        IDisposable OnPreUnsafeUpdate(IUpdateable update);
+        IDisposable? OnPreUnsafeUpdate(IUpdateable update);
         LambdaExpression OnPreUnsafeInsert(IQueryable query, LambdaExpression constructor, IQueryable entityQuery);
         void OnPreBulkInsert(bool inMListTable);
 
-        ICacheController CacheController { get; }
+        ICacheController? CacheController { get; }
 
-        Dictionary<PropertyRoute, IAdditionalBinding> AdditionalBindings { get; }
+        Dictionary<PropertyRoute, IAdditionalBinding>? AdditionalBindings { get; }
     }
 }
diff --git a/Signum.Engine/Schema/FluentInclude.cs b/Signum.Engine/Schema/FluentInclude.cs
index 5ae110e045..056880f8fb 100644
--- a/Signum.Engine/Schema/FluentInclude.cs
+++ b/Signum.Engine/Schema/FluentInclude.cs
@@ -1,4 +1,4 @@
-using Signum.Entities;
+using Signum.Entities;
 using System;
 using System.Linq.Expressions;
 
@@ -15,19 +15,24 @@ public FluentInclude(Table table, SchemaBuilder schemaBuilder)
             SchemaBuilder = schemaBuilder;
         }
 
-        public FluentInclude<T> WithUniqueIndex(Expression<Func<T, object>> fields, Expression<Func<T, bool>> where = null, Expression<Func<T, object>> includeFields = null)
+        public FluentInclude<T> WithUniqueIndex(Expression<Func<T, object>> fields, Expression<Func<T, bool>>? where = null, Expression<Func<T, object>>? includeFields = null)
         {
             this.SchemaBuilder.AddUniqueIndex<T>(fields, where, includeFields);
             return this;
         }
 
-        public FluentInclude<T> WithIndex(Expression<Func<T, object>> fields, Expression<Func<T, bool>> where = null, Expression<Func<T, object>> includeFields = null)
+        public FluentInclude<T> WithIndex(Expression<Func<T, object>> fields, 
+            Expression<Func<T, bool>>? where = null, 
+            Expression<Func<T, object>>? includeFields = null)
         {
             this.SchemaBuilder.AddIndex<T>(fields, where, includeFields);
             return this;
         }
 
-        public FluentInclude<T> WithUniqueIndexMList<M>(Expression<Func<T, MList<M>>> mlist, Expression<Func<MListElement<T, M>, object>> fields = null, Expression<Func<MListElement<T, M>, bool>> where = null, Expression<Func<MListElement<T, M>, object>> includeFields = null)
+        public FluentInclude<T> WithUniqueIndexMList<M>(Expression<Func<T, MList<M>>> mlist, 
+            Expression<Func<MListElement<T, M>, object>>? fields = null, 
+            Expression<Func<MListElement<T, M>, bool>>? where = null, 
+            Expression<Func<MListElement<T, M>, object>>? includeFields = null)
         {
             if (fields == null)
                 fields = mle => new { mle.Parent, mle.Element };
@@ -36,7 +41,10 @@ public FluentInclude<T> WithUniqueIndexMList<M>(Expression<Func<T, MList<M>>> ml
             return this;
         }
 
-        public FluentInclude<T> WithIndexMList<M>(Expression<Func<T, MList<M>>> mlist, Expression<Func<MListElement<T, M>, object>> fields, Expression<Func<MListElement<T, M>, bool>> where = null, Expression<Func<MListElement<T, M>, object>> includeFields = null)
+        public FluentInclude<T> WithIndexMList<M>(Expression<Func<T, MList<M>>> mlist, 
+            Expression<Func<MListElement<T, M>, object>> fields, 
+            Expression<Func<MListElement<T, M>, bool>>? where = null, 
+            Expression<Func<MListElement<T, M>, object>>? includeFields = null)
         {
             this.SchemaBuilder.AddIndexMList<T, M>(mlist, fields, where, includeFields);
             return this;
diff --git a/Signum.Engine/Schema/ObjectName.cs b/Signum.Engine/Schema/ObjectName.cs
index 01949be6f0..5ac881516a 100644
--- a/Signum.Engine/Schema/ObjectName.cs
+++ b/Signum.Engine/Schema/ObjectName.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using Signum.Utilities;
 
 namespace Signum.Engine.Maps
@@ -48,7 +48,7 @@ public override int GetHashCode()
             return Name.GetHashCode();
         }
 
-        public static ServerName Parse(string name)
+        public static ServerName? Parse(string? name)
         {
             if (string.IsNullOrEmpty(name))
                 return null;
@@ -61,9 +61,9 @@ public class DatabaseName : IEquatable<DatabaseName>
     {
         public string Name { get; private set; }
 
-        public ServerName Server { get; private set; }
+        public ServerName? Server { get; private set; }
 
-        public DatabaseName(ServerName server, string name)
+        public DatabaseName(ServerName? server, string name)
         {
             if (string.IsNullOrEmpty(name))
                 throw new ArgumentNullException(nameof(name));
@@ -101,7 +101,7 @@ public override int GetHashCode()
             return Name.GetHashCode() ^ (Server == null ? 0 : Server.GetHashCode());
         }
 
-        public static DatabaseName Parse(string name)
+        public static DatabaseName? Parse(string? name)
         {
             if (string.IsNullOrEmpty(name))
                 return null;
@@ -116,9 +116,9 @@ public class SchemaName : IEquatable<SchemaName>
     {
         public string Name { get; private set; }
 
-        readonly DatabaseName database;
+        readonly DatabaseName? database;
 
-        public DatabaseName Database
+        public DatabaseName? Database
         {
             get
             {
@@ -136,7 +136,7 @@ public bool IsDefault()
             return Name == "dbo" && Database == null;
         }
 
-        public SchemaName(DatabaseName database, string name)
+        public SchemaName(DatabaseName? database, string name)
         {
             if (string.IsNullOrEmpty(name))
                 throw new ArgumentNullException(nameof(name));
@@ -172,7 +172,7 @@ public override int GetHashCode()
             return Name.GetHashCode() ^ (Database == null ? 0 : Database.GetHashCode());
         }
 
-        public static SchemaName Parse(string name)
+        public static SchemaName Parse(string? name)
         {
             if (string.IsNullOrEmpty(name))
                 return SchemaName.Default;
@@ -218,7 +218,7 @@ public override int GetHashCode()
             return Name.GetHashCode() ^ Schema.GetHashCode();
         }
 
-        public static ObjectName Parse(string name)
+        public static ObjectName Parse(string? name)
         {
             if (string.IsNullOrEmpty(name))
                 throw new ArgumentNullException(nameof(name));
@@ -230,7 +230,7 @@ public static ObjectName Parse(string name)
 
         //FROM "[a.b.c].[d.e.f].[a.b.c].[c.d.f]"
         //TO   ("[a.b.c].[d.e.f].[a.b.c]", "c.d.f")
-        internal static (string prefix, string name) SplitLast(string str)
+        internal static (string? prefix, string name) SplitLast(string str)
         {
             if (!str.EndsWith("]"))
             {
@@ -247,7 +247,7 @@ internal static (string prefix, string name) SplitLast(string str)
             );
         }
 
-        public ObjectName OnDatabase(DatabaseName databaseName)
+        public ObjectName OnDatabase(DatabaseName? databaseName)
         {
             return new ObjectName(new SchemaName(databaseName, Schema.Name), Name);
         }
diff --git a/Signum.Engine/Schema/Schema.Basics.cs b/Signum.Engine/Schema/Schema.Basics.cs
index 5ef9a142fa..f1355d08d9 100644
--- a/Signum.Engine/Schema/Schema.Basics.cs
+++ b/Signum.Engine/Schema/Schema.Basics.cs
@@ -17,7 +17,7 @@ namespace Signum.Engine.Maps
     public interface IFieldFinder
     {
         Field GetField(MemberInfo value);
-        Field TryGetField(MemberInfo value);
+        Field? TryGetField(MemberInfo value);
     }
 
     public interface ITable
@@ -28,13 +28,13 @@ public interface ITable
 
         Dictionary<string, IColumn> Columns { get; }
 
-        List<Index> MultiColumnIndexes { get; set; }
+        List<Index>? MultiColumnIndexes { get; set; }
 
         List<Index> GeneratAllIndexes();
 
         void GenerateColumns();
 
-        SystemVersionedInfo SystemVersioned { get; }
+        SystemVersionedInfo? SystemVersioned { get; }
     }
 
     public class SystemVersionedInfo
@@ -43,6 +43,13 @@ public class SystemVersionedInfo
         public string StartColumnName;
         public string EndColumnName;
 
+        public SystemVersionedInfo(ObjectName tableName, string startColumnName, string endColumnName)
+        {
+            TableName = tableName;
+            StartColumnName = startColumnName;
+            EndColumnName = endColumnName;
+        }
+
         internal IEnumerable<IColumn> Columns()
         {
             return new[]
@@ -72,15 +79,15 @@ public Column(string name, ColumnType systemVersionColumnType)
             public IsNullable Nullable => IsNullable.No;
             public SqlDbType SqlDbType => SqlDbType.DateTime2;
             public Type Type => typeof(DateTime);
-            public string UserDefinedTypeName => null;
+            public string? UserDefinedTypeName => null;
             public bool PrimaryKey => false;
             public bool IdentityBehaviour => false;
             public bool Identity => false;
-            public string Default { get; set; }
+            public string? Default { get; set; }
             public int? Size => null;
             public int? Scale => null;
-            public string Collation => null;
-            public Table ReferenceTable => null;
+            public string? Collation => null;
+            public Table? ReferenceTable => null;
             public bool AvoidForeignKey => false;
         }
 
@@ -101,20 +108,22 @@ public partial class Table : IFieldFinder, ITable, ITablePrivate
         public bool IsView { get; internal set; }
         public string CleanTypeName { get; set; }
 
-        public SystemVersionedInfo SystemVersioned { get; set; }
+        public SystemVersionedInfo? SystemVersioned { get; set; }
 
         public Dictionary<string, EntityField> Fields { get; set; }
-        public Dictionary<Type, FieldMixin> Mixins { get; set; }
+        public Dictionary<Type, FieldMixin>? Mixins { get; set; }
 
         public Dictionary<string, IColumn> Columns { get; set; }
 
 
-        public List<Index> MultiColumnIndexes { get; set; }
+        public List<Index>? MultiColumnIndexes { get; set; }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
         public Table(Type type)
         {
             this.Type = type;
         }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         public override string ToString()
         {
@@ -154,6 +163,8 @@ public Field GetField(MemberInfo member)
                 }
             }
 
+            member = member! /*CSBUG*/;
+
             FieldInfo fi = member as FieldInfo ?? Reflector.FindFieldInfo(Type, (PropertyInfo)member);
 
             if (fi == null)
@@ -164,7 +175,7 @@ public Field GetField(MemberInfo member)
             return field.Field;
         }
 
-        public Field TryGetField(MemberInfo member)
+        public Field? TryGetField(MemberInfo member)
         {
             if (member is MethodInfo mi)
             {
@@ -181,12 +192,14 @@ public Field TryGetField(MemberInfo member)
                 return Mixins?.TryGetC((Type)member);
             }
 
-            FieldInfo fi = member as FieldInfo ??  Reflector.TryFindFieldInfo(Type, (PropertyInfo)member);
+            member = member!; /*CSBUG*/
+
+            FieldInfo fi = member as FieldInfo ??  Reflector.TryFindFieldInfo(Type, (PropertyInfo)member)!;
 
             if (fi == null)
                 return null;
 
-            EntityField field = Fields.TryGetC(fi.Name);
+            EntityField? field = Fields.TryGetC(fi.Name);
 
             if (field == null)
                 return null;
@@ -273,13 +286,14 @@ public class EntityField
         public FieldInfo FieldInfo { get; private set; }
 
         Type type;
-        Func<object, object> getter;
-        public Func<object, object> Getter => getter ?? (getter = ReflectionTools.CreateGetterUntyped(type, FieldInfo));
+        Func<object, object?>? getter;
+        public Func<object, object?> Getter => getter ?? (getter = ReflectionTools.CreateGetterUntyped(type, FieldInfo)!);
 
-        public EntityField(Type type, FieldInfo fi)
+        public EntityField(Type type, FieldInfo fi, Field field)
         {
-            FieldInfo = fi;
+            this.FieldInfo = fi;
             this.type = type;
+            this.Field = field;
         }
 
         public override string ToString()
@@ -292,9 +306,9 @@ public abstract partial class Field
     {
         public Type FieldType { get; private set; }
         public PropertyRoute Route { get; private set; }
-        public UniqueIndex UniqueIndex { get; set; }
+        public UniqueIndex? UniqueIndex { get; set; }
 
-        public Field(PropertyRoute route, Type fieldType = null)
+        public Field(PropertyRoute route, Type? fieldType = null)
         {
             this.Route = route;
             this.FieldType = fieldType ?? route.Type;
@@ -311,7 +325,7 @@ public virtual IEnumerable<Index> GenerateIndexes(ITable table)
             return new[] { UniqueIndex };
         }
 
-        public virtual UniqueIndex GenerateUniqueIndex(ITable table, UniqueIndexAttribute attribute)
+        public virtual UniqueIndex? GenerateUniqueIndex(ITable table, UniqueIndexAttribute attribute)
         {
             if (attribute == null)
                 return null;
@@ -366,15 +380,15 @@ public partial interface IColumn
         IsNullable Nullable { get; }
         SqlDbType SqlDbType { get; }
         Type Type { get; }
-        string UserDefinedTypeName { get; }
+        string? UserDefinedTypeName { get; }
         bool PrimaryKey { get; }
         bool IdentityBehaviour { get; }
         bool Identity { get; }
-        string Default { get; }
+        string? Default { get; }
         int? Size { get; }
         int? Scale { get; }
-        string Collation { get; }
-        Table ReferenceTable { get; }
+        string? Collation { get; }
+        Table? ReferenceTable { get; }
         bool AvoidForeignKey { get; }
     }
 
@@ -420,23 +434,25 @@ public partial class FieldPrimaryKey : Field, IColumn
         public string Name { get; set; }
         IsNullable IColumn.Nullable { get { return IsNullable.No; } }
         public SqlDbType SqlDbType { get; set; }
-        public string UserDefinedTypeName { get; set; }
+        public string? UserDefinedTypeName { get; set; }
         bool IColumn.PrimaryKey { get { return true; } }
         public bool Identity { get; set; }
         bool IColumn.IdentityBehaviour { get { return table.IdentityBehaviour; } }
         int? IColumn.Size { get { return null; } }
         int? IColumn.Scale { get { return null; } }
-        public string Collation { get; set; }
-        Table IColumn.ReferenceTable { get { return null; } }
+        public string? Collation { get; set; }
+        Table? IColumn.ReferenceTable { get { return null; } }
         public Type Type { get; set; }
         public bool AvoidForeignKey { get { return false; } }
-        public string Default { get; set; }
+        public string? Default { get; set; }
 
         Table table;
-        public FieldPrimaryKey(PropertyRoute route, Table table)
+        public FieldPrimaryKey(PropertyRoute route, Table table, string name, Type type)
             : base(route)
         {
             this.table = table;
+            this.Name = name;
+            this.Type = type;
         }
 
         public override string ToString()
@@ -473,20 +489,21 @@ public partial class FieldValue : Field, IColumn
         public string Name { get; set; }
         public IsNullable Nullable { get; set; }
         public SqlDbType SqlDbType { get; set; }
-        public string UserDefinedTypeName { get; set; }
+        public string? UserDefinedTypeName { get; set; }
         public bool PrimaryKey { get; set; }
         bool IColumn.Identity { get { return false; } }
         bool IColumn.IdentityBehaviour { get { return false; } }
         public int? Size { get; set; }
-        public string Collation { get; set; }
+        public string? Collation { get; set; }
         public int? Scale { get; set; }
-        Table IColumn.ReferenceTable { get { return null; } }
+        Table? IColumn.ReferenceTable { get { return null; } }
         public bool AvoidForeignKey { get { return false; } }
-        public string Default { get; set; }
+        public string? Default { get; set; }
 
-        public FieldValue(PropertyRoute route, Type fieldType = null)
+        public FieldValue(PropertyRoute route, Type? fieldType, string name)
             : base(route, fieldType)
         {
+            this.Name = name;
         }
 
         public override string ToString()
@@ -524,9 +541,10 @@ public partial class FieldTicks : FieldValue
     {
         public new Type Type { get; set; }
 
-        public FieldTicks(PropertyRoute route)
-            : base(route)
+        public FieldTicks(PropertyRoute route, Type type, string name)
+            : base(route, null, name)
         {
+            this.Type = type;
         }
     }
 
@@ -537,29 +555,33 @@ public partial class EmbeddedHasValueColumn : IColumn
             public string Name { get; set; }
             public IsNullable Nullable { get { return IsNullable.No; } } //even on neasted embeddeds
             public SqlDbType SqlDbType { get { return SqlDbType.Bit; } }
-            string IColumn.UserDefinedTypeName { get { return null; } }
+            string? IColumn.UserDefinedTypeName { get { return null; } }
             bool IColumn.PrimaryKey { get { return false; } }
             bool IColumn.Identity { get { return false; } }
             bool IColumn.IdentityBehaviour { get { return false; } }
             int? IColumn.Size { get { return null; } }
             int? IColumn.Scale { get { return null; } }
-            string IColumn.Collation { get { return null; } }
-            public Table ReferenceTable { get { return null; } }
+            string? IColumn.Collation { get { return null; } }
+            public Table? ReferenceTable { get { return null; } }
             Type IColumn.Type { get { return typeof(bool); } }
             public bool AvoidForeignKey { get { return false; } }
-            public string Default { get; set; }
+            public string? Default { get; set; }
 
+            public EmbeddedHasValueColumn(string name)
+            {
+                Name = name;
+            }
         }
 
-        public EmbeddedHasValueColumn HasValue { get; set; }
+        public EmbeddedHasValueColumn? HasValue { get; set; }
 
         public Dictionary<string, EntityField> EmbeddedFields { get; set; }
-
-        public Func<EmbeddedEntity> Constructor { get; private set; }
-
-        public FieldEmbedded(PropertyRoute route)
+        
+        public FieldEmbedded(PropertyRoute route, EmbeddedHasValueColumn? hasValue, Dictionary<string, EntityField> embeddedFields)
             : base(route)
         {
+            this.HasValue = hasValue;
+            this.EmbeddedFields = embeddedFields;
         }
 
         public override string ToString()
@@ -579,14 +601,14 @@ public Field GetField(MemberInfo member)
             return field.Field;
         }
 
-        public Field TryGetField(MemberInfo value)
+        public Field? TryGetField(MemberInfo value)
         {
-            FieldInfo fi = value as FieldInfo ?? Reflector.TryFindFieldInfo(FieldType, (PropertyInfo)value);
+            FieldInfo fi = value as FieldInfo ?? Reflector.TryFindFieldInfo(FieldType, (PropertyInfo)value)!;
 
             if (fi == null)
                 return null;
 
-            EntityField field = EmbeddedFields.TryGetC(fi.Name);
+            EntityField? field = EmbeddedFields.TryGetC(fi.Name);
 
             if (field == null)
                 return null;
@@ -634,10 +656,11 @@ public partial class FieldMixin : Field, IFieldFinder
 
         public Table MainEntityTable;
 
-        public FieldMixin(PropertyRoute route, Table mainEntityTable)
+        public FieldMixin(PropertyRoute route, Table mainEntityTable, Dictionary<string, EntityField> fields)
             : base(route)
         {
             this.MainEntityTable = mainEntityTable;
+            this.Fields = fields;
         }
 
         public override string ToString()
@@ -657,14 +680,14 @@ public Field GetField(MemberInfo member)
             return field.Field;
         }
 
-        public Field TryGetField(MemberInfo value)
+        public Field? TryGetField(MemberInfo value)
         {
-            FieldInfo fi = value as FieldInfo ?? Reflector.TryFindFieldInfo(FieldType, (PropertyInfo)value);
+            FieldInfo fi = value as FieldInfo ?? Reflector.TryFindFieldInfo(FieldType, (PropertyInfo)value)!;
 
             if (fi == null)
                 return null;
 
-            EntityField field = Fields.TryGetC(fi.Name);
+            EntityField? field = Fields.TryGetC(fi.Name);
 
             if (field == null)
                 return null;
@@ -719,18 +742,23 @@ public partial class FieldReference : Field, IColumn, IFieldReference
         int? IColumn.Size { get { return null; } }
         int? IColumn.Scale { get { return null; } }
         public Table ReferenceTable { get; set; }
+        Table? IColumn.ReferenceTable => ReferenceTable;
         public SqlDbType SqlDbType { get { return ReferenceTable.PrimaryKey.SqlDbType; } }
-        public string Collation { get { return ReferenceTable.PrimaryKey.Collation; } }
-        public string UserDefinedTypeName { get { return ReferenceTable.PrimaryKey.UserDefinedTypeName; } }
+        public string? Collation { get { return ReferenceTable.PrimaryKey.Collation; } }
+        public string? UserDefinedTypeName { get { return ReferenceTable.PrimaryKey.UserDefinedTypeName; } }
         public virtual Type Type { get { return this.Nullable.ToBool() ? ReferenceTable.PrimaryKey.Type.Nullify() : ReferenceTable.PrimaryKey.Type; } }
 
         public bool AvoidForeignKey { get; set; }
 
         public bool IsLite { get; internal set; }
         public bool AvoidExpandOnRetrieving { get; set; }
-        public string Default { get; set; }
+        public string? Default { get; set; }
 
-        public FieldReference(PropertyRoute route, Type fieldType = null) : base(route, fieldType) { }
+        public FieldReference(PropertyRoute route, Type? fieldType, string name, Table referenceTable) : base(route, fieldType)
+        {
+            this.Name = name;
+            this.ReferenceTable = referenceTable;
+        }
 
         public override string ToString()
         {
@@ -800,7 +828,7 @@ public override Type Type
             }
         }
 
-        public FieldEnum(PropertyRoute route) : base(route) { }
+        public FieldEnum(PropertyRoute route, string name, Table referenceTable) : base(route, null, name, referenceTable) { }
 
         public override string ToString()
         {
@@ -838,7 +866,10 @@ public partial class FieldImplementedBy : Field, IFieldReference
 
         public Dictionary<Type, ImplementationColumn> ImplementationColumns { get; set; }
 
-        public FieldImplementedBy(PropertyRoute route) : base(route) { }
+        public FieldImplementedBy(PropertyRoute route, Dictionary<Type, ImplementationColumn> implementations) : base(route, null)
+        {
+            this.ImplementationColumns = implementations;
+        }
 
         public override string ToString()
         {
@@ -895,7 +926,11 @@ public partial class FieldImplementedByAll : Field, IFieldReference
         public ImplementationStringColumn Column { get; set; }
         public ImplementationColumn ColumnType { get; set; }
 
-        public FieldImplementedByAll(PropertyRoute route) : base(route) { }
+        public FieldImplementedByAll(PropertyRoute route, ImplementationStringColumn column, ImplementationColumn columnType) : base(route)
+        {
+            this.Column = column;
+            this.ColumnType = columnType;
+        }
 
         public override IEnumerable<IColumn> Columns()
         {
@@ -950,38 +985,53 @@ public partial class ImplementationColumn : IColumn
         bool IColumn.IdentityBehaviour { get { return false; } }
         int? IColumn.Size { get { return null; } }
         int? IColumn.Scale { get { return null; } }
-        public Table ReferenceTable { get; set; }
+        public Table ReferenceTable { get; private set; }
+        Table? IColumn.ReferenceTable => ReferenceTable;
         public SqlDbType SqlDbType { get { return ReferenceTable.PrimaryKey.SqlDbType; } }
-        public string Collation { get { return ReferenceTable.PrimaryKey.Collation; } }
-        public string UserDefinedTypeName { get { return ReferenceTable.PrimaryKey.UserDefinedTypeName; } }
+        public string? Collation { get { return ReferenceTable.PrimaryKey.Collation; } }
+        public string? UserDefinedTypeName { get { return ReferenceTable.PrimaryKey.UserDefinedTypeName; } }
         public Type Type { get { return this.Nullable.ToBool() ? ReferenceTable.PrimaryKey.Type.Nullify() : ReferenceTable.PrimaryKey.Type; } }
         public bool AvoidForeignKey { get; set; }
-        public string Default { get; set; }
+        public string? Default { get; set; }
+
+        public ImplementationColumn(string name, Table referenceTable)
+        {
+            Name = name;
+            ReferenceTable = referenceTable;
+        }
     }
 
     public partial class ImplementationStringColumn : IColumn
     {
         public string Name { get; set; }
         public IsNullable Nullable { get; set; }
-        string IColumn.UserDefinedTypeName { get { return null; } }
+        string? IColumn.UserDefinedTypeName { get { return null; } }
         bool IColumn.PrimaryKey { get { return false; } }
         bool IColumn.Identity { get { return false; } }
         bool IColumn.IdentityBehaviour { get { return false; } }
         public int? Size { get; set; }
         int? IColumn.Scale { get { return null; } }
-        public string Collation { get; set; }
-        public Table ReferenceTable { get { return null; } }
+        public string? Collation { get; set; }
+        public Table? ReferenceTable { get { return null; } }
         public SqlDbType SqlDbType { get { return SqlDbType.NVarChar; } }
         public Type Type { get { return typeof(string); } }
         public bool AvoidForeignKey { get { return false; } }
-        public string Default { get; set; }
+        public string? Default { get; set; }
+
+        public ImplementationStringColumn(string name)
+        {
+            Name = name;
+        }
     }
 
     public partial class FieldMList : Field, IFieldFinder
     {
         public TableMList TableMList { get; set; }
 
-        public FieldMList(PropertyRoute route) : base(route) { }
+        public FieldMList(PropertyRoute route, TableMList tableMList) : base(route)
+        {
+            this.TableMList = tableMList;
+        }
 
         public override string ToString()
         {
@@ -996,7 +1046,7 @@ public Field GetField(MemberInfo member)
             throw new InvalidOperationException("{0} not supported by MList field".FormatWith(member.Name));
         }
 
-        public Field TryGetField(MemberInfo member)
+        public Field? TryGetField(MemberInfo member)
         {
             if (member.Name == "Item")
                 return TableMList.Field;
@@ -1039,42 +1089,52 @@ public class PrimaryKeyColumn : IColumn
             public string Name { get; set; }
             IsNullable IColumn.Nullable { get { return IsNullable.No; } }
             public SqlDbType SqlDbType { get; set; }
-            public string Collation { get; set; }
-            public string UserDefinedTypeName { get; set; }
+            public string? Collation { get; set; }
+            public string? UserDefinedTypeName { get; set; }
             bool IColumn.PrimaryKey { get { return true; } }
             public bool Identity { get; set; }
             bool IColumn.IdentityBehaviour { get { return true; } }
             int? IColumn.Size { get { return null; } }
             int? IColumn.Scale { get { return null; } }
-            Table IColumn.ReferenceTable { get { return null; } }
+            Table? IColumn.ReferenceTable { get { return null; } }
             public Type Type { get; set; }
             public bool AvoidForeignKey { get { return false; } }
-            public string Default { get; set; }
+            public string? Default { get; set; }
+
+            public PrimaryKeyColumn(Type type, string name)
+            {
+                Type = type;
+                Name = name;
+            }
         }
 
         public Dictionary<string, IColumn> Columns { get; set; }
-        public List<Index> MultiColumnIndexes { get; set; }
+        public List<Index>? MultiColumnIndexes { get; set; }
 
         public ObjectName Name { get; set; }
         public PrimaryKeyColumn PrimaryKey { get; set; }
         public FieldReference BackReference { get; set; }
-        public FieldValue Order { get; set; }
+        public FieldValue? Order { get; set; }
         public Field Field { get; set; }
 
-        public SystemVersionedInfo SystemVersioned { get; set; }
+        public SystemVersionedInfo? SystemVersioned { get; set; }
 
         public Type CollectionType { get; private set; }
-        public Func<IList> Constructor { get; private set; }
 
         public PropertyRoute PropertyRoute { get; internal set; }
-        Func<Entity, IMListPrivate> getter;
+        Func<Entity, IMListPrivate>? getter;
         public Func<Entity, IMListPrivate> Getter => getter ?? (getter = PropertyRoute.GetLambdaExpression<Entity, IMListPrivate>(true).Compile());
 
-        public TableMList(Type collectionType)
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
+        public TableMList(Type collectionType, ObjectName name, PrimaryKeyColumn primaryKey, FieldReference backReference)
         {
+            this.Name = name;
+            this.PrimaryKey = primaryKey;
+            this.BackReference = backReference;
             this.CollectionType = collectionType;
             this.cache = new Lazy<IMListCache>(() => (IMListCache)giCreateCache.GetInvoker(this.Field.FieldType)(this));
         }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         public override string ToString()
         {
@@ -1110,7 +1170,7 @@ public List<Index> GeneratAllIndexes()
 
         public Field GetField(MemberInfo member)
         {
-            Field result = TryGetField(member);
+            Field? result = TryGetField(member);
 
             if(result  == null)
                 throw new InvalidOperationException("'{0}' not found".FormatWith(member.Name));
@@ -1118,7 +1178,7 @@ public Field GetField(MemberInfo member)
             return result;
         }
 
-        public Field TryGetField(MemberInfo mi)
+        public Field? TryGetField(MemberInfo mi)
         {
             if (mi.Name == "Parent")
                 return this.BackReference;
diff --git a/Signum.Engine/Schema/Schema.Delete.cs b/Signum.Engine/Schema/Schema.Delete.cs
index bbad01f8d1..8858582858 100644
--- a/Signum.Engine/Schema/Schema.Delete.cs
+++ b/Signum.Engine/Schema/Schema.Delete.cs
@@ -9,7 +9,7 @@ namespace Signum.Engine.Maps
 {
     public partial class Table
     {
-        public SqlPreCommand DeleteSqlSync<T>(T entity, Expression<Func<T, bool>> where, string comment = null)
+        public SqlPreCommand DeleteSqlSync<T>(T entity, Expression<Func<T, bool>>? where, string? comment = null)
             where T : Entity
         {
             if (typeof(T) != Type && where != null)
diff --git a/Signum.Engine/Schema/Schema.Save.cs b/Signum.Engine/Schema/Schema.Save.cs
index 8f5396ce5f..97d3be8376 100644
--- a/Signum.Engine/Schema/Schema.Save.cs
+++ b/Signum.Engine/Schema/Schema.Save.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Entities;
@@ -19,7 +19,7 @@ namespace Signum.Engine.Maps
 {
     public struct Forbidden
     {
-        public Forbidden(HashSet<Entity> set)
+        public Forbidden(HashSet<Entity>? set)
         {
             this.set = set;
         }
@@ -29,7 +29,7 @@ public Forbidden(DirectedGraph<Entity> graph, Entity entity)
             this.set = graph?.TryRelatedTo(entity);
         }
 
-        readonly HashSet<Entity> set;
+        readonly HashSet<Entity>? set;
 
         public bool IsEmpty
         {
@@ -99,8 +99,14 @@ class InsertCacheDisableIdentity
             public Func<object /*Entity*/, Forbidden, string, List<DbParameter>> InsertParameters;
 
             ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>> insertDisableIdentityCache =
-                new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>>();
-
+                new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>>();
+
+            public InsertCacheDisableIdentity(Table table, Func<string, string> sqlInsertPattern, Func<object, Forbidden, string, List<DbParameter>> insertParameters)
+            {
+                this.table = table;
+                SqlInsertPattern = sqlInsertPattern;
+                InsertParameters = insertParameters;
+            }
 
             internal Action<List<Entity>, DirectedGraph<Entity>> GetInserter(int numElements)
             {
@@ -114,22 +120,21 @@ Action<List<Entity>, DirectedGraph<Entity>> GetInsertDisableIdentity()
 
                 return (list, graph) =>
                 {
-                    Entity etity = list.Single();
+                    Entity entity = list.Single();
 
-                    AssertHasId(etity);
-
-                    if (etity is Entity entity)
-                        entity.Ticks = TimeZoneManager.Now.Ticks;
+                    AssertHasId(entity);
+                    
+                    entity.Ticks = TimeZoneManager.Now.Ticks;
 
-                    table.SetToStrField(etity);
+                    table.SetToStrField(entity);
 
-                    var forbidden = new Forbidden(graph, etity);
+                    var forbidden = new Forbidden(graph, entity);
 
-                    new SqlPreCommandSimple(sqlSingle, InsertParameters(etity, forbidden, "")).ExecuteNonQuery();
+                    new SqlPreCommandSimple(sqlSingle, InsertParameters(entity, forbidden, "")).ExecuteNonQuery();
 
-                    etity.IsNew = false;
+                    entity.IsNew = false;
                     if (table.saveCollections.Value != null)
-                        table.saveCollections.Value.InsertCollections(new List<EntityForbidden> { new EntityForbidden(etity, forbidden) });
+                        table.saveCollections.Value.InsertCollections(new List<EntityForbidden> { new EntityForbidden(entity, forbidden) });
                 };
             }
 
@@ -139,33 +144,32 @@ Action<List<Entity>, DirectedGraph<Entity>> GetInsertMultiDisableIdentity(int nu
             {
                 string sqlMulti = Enumerable.Range(0, num).ToString(i => SqlInsertPattern(i.ToString()), ";\r\n");
 
-                return (idents, graph) =>
+                return (entities, graph) =>
                 {
                     for (int i = 0; i < num; i++)
                     {
-                        var ident = idents[i];
-                        AssertHasId(ident);
+                        var entity = entities[i];
+                        AssertHasId(entity);
 
-                        if (ident is Entity entity)
-                            entity.Ticks = TimeZoneManager.Now.Ticks;
+                        entity.Ticks = TimeZoneManager.Now.Ticks;
 
-                        table.SetToStrField(ident);
+                        table.SetToStrField(entity);
                     }
 
                     List<DbParameter> result = new List<DbParameter>();
-                    for (int i = 0; i < idents.Count; i++)
-                        result.AddRange(InsertParameters(idents[i], new Forbidden(graph, idents[i]), i.ToString()));
+                    for (int i = 0; i < entities.Count; i++)
+                        result.AddRange(InsertParameters(entities[i], new Forbidden(graph, entities[i]), i.ToString()));
 
                     new SqlPreCommandSimple(sqlMulti, result).ExecuteNonQuery();
                     for (int i = 0; i < num; i++)
                     {
-                        Entity ident = idents[i];
+                        Entity ident = entities[i];
 
                         ident.IsNew = false;
                     }
 
                     if (table.saveCollections.Value != null)
-                        table.saveCollections.Value.InsertCollections(idents.Select(e => new EntityForbidden(e, graph)).ToList());
+                        table.saveCollections.Value.InsertCollections(entities.Select(e => new EntityForbidden(e, graph)).ToList());
                 };
             }
 
@@ -173,8 +177,6 @@ internal static InsertCacheDisableIdentity InitializeInsertDisableIdentity(Table
             {
                 using (HeavyProfiler.LogNoStackTrace("InitializeInsertDisableIdentity", () => table.Type.TypeName()))
                 {
-                    InsertCacheDisableIdentity result = new InsertCacheDisableIdentity { table = table };
-
                     var trios = new List<Table.Trio>();
                     var assigments = new List<Expression>();
                     var paramIdent = Expression.Parameter(typeof(object) /*Entity*/, "ident");
@@ -191,7 +193,7 @@ internal static InsertCacheDisableIdentity InitializeInsertDisableIdentity(Table
                         foreach (var item in table.Mixins.Values)
                             item.CreateParameter(trios, assigments, cast, paramForbidden, paramSuffix);
 
-                    result.SqlInsertPattern = (suffix) =>
+                    Func<string, string> insertPattern = (suffix) =>
                         "INSERT {0} ({1})\r\n VALUES ({2})".FormatWith(table.Name,
                         trios.ToString(p => p.SourceColumn.SqlEscape(), ", "),
                         trios.ToString(p => p.ParameterName + suffix, ", "));
@@ -199,9 +201,8 @@ internal static InsertCacheDisableIdentity InitializeInsertDisableIdentity(Table
                     var expr = Expression.Lambda<Func<object, Forbidden, string, List<DbParameter>>>(
                         CreateBlock(trios.Select(a => a.ParameterBuilder), assigments), paramIdent, paramForbidden, paramSuffix);
 
-                    result.InsertParameters = expr.Compile();
-
-                    return result;
+                    
+                    return new InsertCacheDisableIdentity(table, insertPattern, expr.Compile());
                 }
             }
         }
@@ -214,8 +215,15 @@ class InsertCacheIdentity
             public Func<Entity, Forbidden, string, List<DbParameter>> InsertParameters;
 
             ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>> insertIdentityCache =
-               new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>>();
-
+               new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>>();
+
+            public InsertCacheIdentity(Table table, Func<string, bool, string> sqlInsertPattern, Func<Entity, Forbidden, string, List<DbParameter>> insertParameters)
+            {
+                this.table = table;
+                SqlInsertPattern = sqlInsertPattern;
+                InsertParameters = insertParameters;
+            }
+
             internal Action<List<Entity>, DirectedGraph<Entity>> GetInserter(int numElements)
             {
                 return insertIdentityCache.GetOrAdd(numElements, (int num) => GetInsertMultiIdentity(num));
@@ -228,35 +236,34 @@ Action<List<Entity>, DirectedGraph<Entity>> GetInsertMultiIdentity(int num)
                     .AppendLines(Enumerable.Range(0, num).Select(i => SqlInsertPattern(i.ToString(), true)))
                     .AppendLine("SELECT Id from @MyTable").ToString();
 
-                return (idents, graph) =>
+                return (entities, graph) =>
                 {
                     for (int i = 0; i < num; i++)
                     {
-                        var ident = idents[i];
-                        AssertNoId(ident);
+                        var entity = entities[i];
+                        AssertNoId(entity);
 
-                        if (ident is Entity entity)
-                            entity.Ticks = TimeZoneManager.Now.Ticks;
+                        entity.Ticks = TimeZoneManager.Now.Ticks;
 
-                        table.SetToStrField(ident);
+                        table.SetToStrField(entity);
                     }
 
                     List<DbParameter> result = new List<DbParameter>();
-                    for (int i = 0; i < idents.Count; i++)
-                        result.AddRange(InsertParameters(idents[i], new Forbidden(graph, idents[i]), i.ToString()));
+                    for (int i = 0; i < entities.Count; i++)
+                        result.AddRange(InsertParameters(entities[i], new Forbidden(graph, entities[i]), i.ToString()));
 
                     DataTable dt = new SqlPreCommandSimple(sqlMulti, result).ExecuteDataTable();
 
                     for (int i = 0; i < num; i++)
                     {
-                        Entity ident = idents[i];
+                        Entity ident = entities[i];
 
                         ident.id = new PrimaryKey((IComparable)dt.Rows[i][0]);
                         ident.IsNew = false;
                     }
 
                     if (table.saveCollections.Value != null)
-                        table.saveCollections.Value.InsertCollections(idents.Select(e => new EntityForbidden(e, graph)).ToList());
+                        table.saveCollections.Value.InsertCollections(entities.Select(e => new EntityForbidden(e, graph)).ToList());
                 };
 
             }
@@ -265,8 +272,6 @@ internal static InsertCacheIdentity InitializeInsertIdentity(Table table)
             {
                 using (HeavyProfiler.LogNoStackTrace("InitializeInsertIdentity", () => table.Type.TypeName()))
                 {
-                    InsertCacheIdentity result = new InsertCacheIdentity { table = table };
-
                     var trios = new List<Table.Trio>();
                     var assigments = new List<Expression>();
                     var paramIdent = Expression.Parameter(typeof(Entity), "ident");
@@ -283,7 +288,7 @@ internal static InsertCacheIdentity InitializeInsertIdentity(Table table)
                         foreach (var item in table.Mixins.Values)
                             item.CreateParameter(trios, assigments, cast, paramForbidden, paramSuffix);
 
-                    result.SqlInsertPattern = (suffix, output) =>
+                    Func<string, bool, string> sqlInsertPattern = (suffix, output) =>
                         "INSERT {0} ({1})\r\n{2} VALUES ({3})".FormatWith(table.Name,
                         trios.ToString(p => p.SourceColumn.SqlEscape(), ", "),
                         output ? "OUTPUT INSERTED.Id into @MyTable \r\n" : null,
@@ -292,14 +297,11 @@ internal static InsertCacheIdentity InitializeInsertIdentity(Table table)
 
                     var expr = Expression.Lambda<Func<Entity, Forbidden, string, List<DbParameter>>>(
                         CreateBlock(trios.Select(a => a.ParameterBuilder), assigments), paramIdent, paramForbidden, paramSuffix);
-
-                    result.InsertParameters = expr.Compile();
-
-                    return result;
+                    
+                    return new InsertCacheIdentity(table, sqlInsertPattern, expr.Compile());
                 }
             }
-        }
-
+        }
 
         static void AssertHasId(Entity ident)
         {
@@ -314,7 +316,7 @@ static void AssertNoId(Entity ident)
         }
 
 
-        public IColumn ToStrColumn
+        public IColumn? ToStrColumn
         {
             get
             {
@@ -343,7 +345,6 @@ internal bool SetToStrField(Entity entity)
                     entity.toStr = newStr;
                     return true;
                 }
-
             }
 
             return false;
@@ -369,8 +370,14 @@ class UpdateCache
             public Func<Entity, long, Forbidden, string, List<DbParameter>> UpdateParameters;
 
             ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>> updateCache =
-                new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>>();
-
+                new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>>();
+
+            public UpdateCache(Table table, Func<string, bool, string> sqlUpdatePattern, Func<Entity, long, Forbidden, string, List<DbParameter>> updateParameters)
+            {
+                this.table = table;
+                SqlUpdatePattern = sqlUpdatePattern;
+                UpdateParameters = updateParameters;
+            }
 
             public Action<List<Entity>, DirectedGraph<Entity>> GetUpdater(int numElements)
             {
@@ -482,8 +489,6 @@ internal static UpdateCache InitializeUpdate(Table table)
             {
                 using (HeavyProfiler.LogNoStackTrace("InitializeUpdate", () => table.Type.TypeName()))
                 {
-                    UpdateCache result = new UpdateCache { table = table };
-
                     var trios = new List<Trio>();
                     var assigments = new List<Expression>();
                     var paramIdent = Expression.Parameter(typeof(Entity), "ident");
@@ -507,7 +512,7 @@ internal static UpdateCache InitializeUpdate(Table table)
 
                     string oldTicksParamName = ParameterBuilder.GetParameterName("old_ticks");
 
-                    result.SqlUpdatePattern = (suffix, output) =>
+                    Func<string, bool, string> sqlUpdatePattern = (suffix, output) =>
                     {
                         string update = "UPDATE {0} SET \r\n{1}\r\n WHERE {2} = {3}".FormatWith(
                             table.Name,
@@ -540,9 +545,8 @@ internal static UpdateCache InitializeUpdate(Table table)
                     var expr = Expression.Lambda<Func<Entity, long, Forbidden, string, List<DbParameter>>>(
                         CreateBlock(parameters, assigments), paramIdent, paramOldTicks, paramForbidden, paramSuffix);
 
-                    result.UpdateParameters = expr.Compile();
-
-                    return result;
+                    
+                    return new UpdateCache(table, sqlUpdatePattern, expr.Compile());
                 }
             }
 
@@ -556,9 +560,18 @@ class CollectionsCache
             public Func<Entity, string, bool, SqlPreCommand> InsertCollectionsSync;
 
             public Action<List<EntityForbidden>> InsertCollections;
-            public Action<List<EntityForbidden>> UpdateCollections;
-
-            internal static CollectionsCache InitializeCollections(Table table)
+            public Action<List<EntityForbidden>> UpdateCollections;
+
+            public CollectionsCache(Func<Entity, string, bool, SqlPreCommand> insertCollectionsSync, 
+                Action<List<EntityForbidden>> insertCollections, 
+                Action<List<EntityForbidden>> updateCollections)
+            {
+                InsertCollectionsSync = insertCollectionsSync;
+                InsertCollections = insertCollections;
+                UpdateCollections = updateCollections;
+            }
+
+            internal static CollectionsCache? InitializeCollections(Table table)
             {
                 using (HeavyProfiler.LogNoStackTrace("InitializeCollections", () => table.Type.TypeName()))
                 {
@@ -570,23 +583,20 @@ internal static CollectionsCache InitializeCollections(Table table)
                         return null;
                     else
                     {
-                        return new CollectionsCache
-                        {
-                            InsertCollections = (entities) =>
+                        return new CollectionsCache(
+                            insertCollections: (entities) =>
                             {
                                 foreach (var rc in caches)
                                     rc.RelationalInserts(entities);
-                            },
-
-                            UpdateCollections = (entities) =>
-                            {
-                                foreach (var rc in caches)
-                                    rc.RelationalUpdates(entities);
-                            },
-
-                            InsertCollectionsSync = (ident, suffix, replaceParameter) =>
-                                caches.Select((rc, i) => rc.RelationalUpdateSync(ident, suffix + "_" + i.ToString(), replaceParameter)).Combine(Spacing.Double)
-                        };
+                            },
+                            updateCollections: (entities) =>
+                           {
+                               foreach (var rc in caches)
+                                   rc.RelationalUpdates(entities);
+                           },
+                            insertCollectionsSync: (ident, suffix, replaceParameter) =>
+                                caches.Select((rc, i) => rc.RelationalUpdateSync(ident, suffix + "_" + i.ToString(), replaceParameter)).Combine(Spacing.Double)!
+                        );
                     }
                 }
             }
@@ -595,7 +605,7 @@ internal static CollectionsCache InitializeCollections(Table table)
         ResetLazy<CollectionsCache> saveCollections;
 
 
-        public SqlPreCommand InsertSqlSync(Entity ident, bool includeCollections = true, string comment = null, string suffix = "")
+        public SqlPreCommand InsertSqlSync(Entity ident, bool includeCollections = true, string? comment = null, string suffix = "")
         {
             PrepareEntitySync(ident);
             SetToStrField(ident);
@@ -624,10 +634,10 @@ public SqlPreCommand InsertSqlSync(Entity ident, bool includeCollections = true,
 
             SqlPreCommand setParent = new SqlPreCommandSimple("SET @parentId = @@Identity");
 
-            return SqlPreCommand.Combine(Spacing.Simple, declareParent, insert, setParent, collections);
+            return SqlPreCommand.Combine(Spacing.Simple, declareParent, insert, setParent, collections)!;
         }
 
-        public SqlPreCommand UpdateSqlSync<T>(T entity, Expression<Func<T, bool>> where, bool includeCollections = true, string comment = null, string suffix = "")
+        public SqlPreCommand? UpdateSqlSync<T>(T entity, Expression<Func<T, bool>> where, bool includeCollections = true, string? comment = null, string suffix = "")
             where T : Entity
         {
             if (typeof(T) != Type && where != null)
@@ -645,7 +655,7 @@ public SqlPreCommand UpdateSqlSync<T>(T entity, Expression<Func<T, bool>> where,
             var sql = uc.SqlUpdatePattern(suffix, false);
             var parameters = uc.UpdateParameters(entity, (entity as Entity)?.Ticks ?? -1, new Forbidden(), suffix);
 
-            SqlPreCommand update;
+            SqlPreCommand? update;
             if (where != null)
             {
                 update = SqlPreCommand.Combine(Spacing.Simple,
@@ -728,14 +738,16 @@ public partial class TableMList
     {
         internal interface IMListCache
         {
-            SqlPreCommand RelationalUpdateSync(Entity parent, string suffix, bool replaceParameter);
+            SqlPreCommand? RelationalUpdateSync(Entity parent, string suffix, bool replaceParameter);
             void RelationalInserts(List<EntityForbidden> entities);
             void RelationalUpdates(List<EntityForbidden> entities);
 
             object[] BulkInsertDataRow(Entity entity, object value, int order);
-        }
-
-        internal class TableMListCache<T> : IMListCache
+        }
+
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
+        internal class TableMListCache<T> : IMListCache
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
         {
             internal TableMList table;
 
@@ -961,7 +973,7 @@ public void RelationalUpdates(List<EntityForbidden> idents)
                                 if (row.RowId.HasValue)
                                 {
                                     if (hasOrder && row.OldIndex != i ||
-                                       isEmbeddedEntity && ((ModifiableEntity)(object)row.Element).IsGraphModified)
+                                       isEmbeddedEntity && ((ModifiableEntity)(object)row.Element!).IsGraphModified)
                                     {
                                         toUpdate.Add(new MListUpdate(ef, collection, i));
                                     }
@@ -984,7 +996,7 @@ public void RelationalUpdates(List<EntityForbidden> idents)
                 toInsert.SplitStatements(this.table.Columns.Count, listPairs => GetInsert(listPairs.Count)(listPairs));
             }
 
-            public SqlPreCommand RelationalUpdateSync(Entity parent, string suffix, bool replaceParameter)
+            public SqlPreCommand? RelationalUpdateSync(Entity parent, string suffix, bool replaceParameter)
             {
                 MList<T> collection = Getter(parent);
 
@@ -1009,7 +1021,7 @@ public SqlPreCommand RelationalUpdateSync(Entity parent, string suffix, bool rep
                         parameters.RemoveAt(0);
                         string script = sqlInsert(suffix + "_" + i, false);
                         script = script.Replace(parentId.ParameterName, "@parentId");
-                        return new SqlPreCommandSimple(script, parameters).AddComment(e.ToString());
+                        return new SqlPreCommandSimple(script, parameters).AddComment(e?.ToString());
                     }).Combine(Spacing.Simple);
                 }
                 else
@@ -1017,7 +1029,7 @@ public SqlPreCommand RelationalUpdateSync(Entity parent, string suffix, bool rep
                     return SqlPreCommand.Combine(Spacing.Simple,
                         new SqlPreCommandSimple(sqlDelete(suffix), new List<DbParameter> { DeleteParameter(parent, suffix) }).ReplaceFirstParameter(replaceParameter ? parent.Id.VariableName : null),
                         collection.Select((e, i) => new SqlPreCommandSimple(sqlInsert(suffix + "_" + i, false), InsertParameters(parent, e, i, new Forbidden(), suffix + "_" + i))
-                            .AddComment(e.ToString())
+                            .AddComment(e?.ToString())
                             .ReplaceFirstParameter(replaceParameter ? parent.Id.VariableName : null)
                         ).Combine(Spacing.Simple));
                 }
@@ -1033,7 +1045,7 @@ TableMListCache<T> CreateCache<T>()
         {
             var pb = Connector.Current.ParameterBuilder;
 
-            TableMListCache<T> result = new TableMListCache<T>()
+            TableMListCache<T> result = new TableMListCache<T>
             {
                 table = this,
                 Getter = entity => (MList<T>)Getter(entity),
@@ -1294,7 +1306,7 @@ public static Expression GetTypeFactory(this IFieldReference fr, Expression valu
             return Expression.Call(fr.IsLite ? miGetTypeForLite : miGetTypeForEntity, value, forbidden);
         }
 
-        static Type GetTypeForLite(Lite<IEntity> value, Forbidden forbidden)
+        static Type? GetTypeForLite(Lite<IEntity> value, Forbidden forbidden)
         {
             if (value == null)
                 return null;
@@ -1305,7 +1317,7 @@ static Type GetTypeForLite(Lite<IEntity> value, Forbidden forbidden)
                  l.EntityType;
         }
 
-        static Type GetTypeForEntity(IEntity value, Forbidden forbidden)
+        static Type? GetTypeForEntity(IEntity value, Forbidden forbidden)
         {
             if (value == null)
                 return null;
@@ -1383,7 +1395,7 @@ protected internal override void CreateParameter(List<Table.Trio> trios, List<Ex
         static MethodInfo miUnWrapToString = ReflectionTools.GetMethodInfo(() => PrimaryKey.UnwrapToString(null));
         static MethodInfo miConvertType = ReflectionTools.GetMethodInfo(() => ConvertType(null));
 
-        static IComparable ConvertType(Type type)
+        static IComparable? ConvertType(Type type)
         {
             if (type == null)
                 return null;
diff --git a/Signum.Engine/Schema/Schema.cs b/Signum.Engine/Schema/Schema.cs
index e45f10b809..ffe4af0a39 100644
--- a/Signum.Engine/Schema/Schema.cs
+++ b/Signum.Engine/Schema/Schema.cs
@@ -19,11 +19,11 @@ namespace Signum.Engine.Maps
 {
     public class Schema : IImplementationsFinder
     {
-        public CultureInfo ForceCultureInfo { get; set; }
+        public CultureInfo? ForceCultureInfo { get; set; }
 
         public TimeZoneMode TimeZoneMode { get; set; }
 
-        Version version;
+        Version? version;
         public Version Version
         {
             get
@@ -42,7 +42,7 @@ public void InvalidateMetadata()
             this.OnMetadataInvalidated?.Invoke();
         }
 
-        string applicationName;
+        string? applicationName;
         public string ApplicationName
         {
             get { return applicationName ?? (applicationName = AppDomain.CurrentDomain.FriendlyName); }
@@ -68,7 +68,7 @@ public Dictionary<Type, Table> Tables
 
         public event Func<Type, bool, string> IsAllowedCallback;
 
-        public string IsAllowed(Type type, bool inUserInterface)
+        public string? IsAllowed(Type type, bool inUserInterface)
         {
             foreach (var f in IsAllowedCallback.GetInvocationListTyped())
             {
@@ -88,7 +88,7 @@ public string IsAllowed(Type type, bool inUserInterface)
 
         public void AssertAllowed(Type type, bool inUserInterface)
         {
-            string error = IsAllowed(type, inUserInterface);
+            string? error = IsAllowed(type, inUserInterface);
 
             if (error != null)
                 throw new UnauthorizedAccessException(EngineMessage.UnauthorizedAccessTo0Because1.NiceToString().FormatWith(type.NiceName(), error));
@@ -112,7 +112,7 @@ internal void OnPreSaving(Entity entity, PreSavingContext ctx)
         {
             AssertAllowed(entity.GetType(), inUserInterface: false);
 
-            IEntityEvents ee = entityEvents.TryGetC(entity.GetType());
+            IEntityEvents? ee = entityEvents.TryGetC(entity.GetType());
 
             if (ee != null)
                 ee.OnPreSaving(entity, ctx);
@@ -120,11 +120,11 @@ internal void OnPreSaving(Entity entity, PreSavingContext ctx)
             entityEventsGlobal.OnPreSaving(entity, ctx);
         }
 
-        internal Entity OnAlternativeRetriving(Type entityType, PrimaryKey id)
+        internal Entity? OnAlternativeRetriving(Type entityType, PrimaryKey id)
         {
             AssertAllowed(entityType, inUserInterface: false);
 
-            IEntityEvents ee = entityEvents.TryGetC(entityType);
+            IEntityEvents? ee = entityEvents.TryGetC(entityType);
 
             if (ee == null)
                 return null;
@@ -136,7 +136,7 @@ internal void OnSaving(Entity entity)
         {
             AssertAllowed(entity.GetType(), inUserInterface: false);
 
-            IEntityEvents ee = entityEvents.TryGetC(entity.GetType());
+            IEntityEvents? ee = entityEvents.TryGetC(entity.GetType());
 
             if (ee != null)
                 ee.OnSaving(entity);
@@ -149,7 +149,7 @@ internal void OnSaved(Entity entity, SavedEventArgs args)
         {
             AssertAllowed(entity.GetType(), inUserInterface: false);
 
-            IEntityEvents ee = entityEvents.TryGetC(entity.GetType());
+            IEntityEvents? ee = entityEvents.TryGetC(entity.GetType());
 
             if (ee != null)
                 ee.OnSaved(entity, args);
@@ -161,7 +161,7 @@ internal void OnRetrieved(Entity entity)
         {
             AssertAllowed(entity.GetType(), inUserInterface: false);
 
-            IEntityEvents ee = entityEvents.TryGetC(entity.GetType());
+            IEntityEvents? ee = entityEvents.TryGetC(entity.GetType());
 
             if (ee != null)
                 ee.OnRetrieved(entity);
@@ -169,11 +169,11 @@ internal void OnRetrieved(Entity entity)
             entityEventsGlobal.OnRetrieved(entity);
         }
 
-        internal IDisposable OnPreUnsafeDelete<T>(IQueryable<T> entityQuery) where T : Entity
+        internal IDisposable? OnPreUnsafeDelete<T>(IQueryable<T> entityQuery) where T : Entity
         {
             AssertAllowed(typeof(T), inUserInterface: false);
 
-            EntityEvents<T> ee = (EntityEvents<T>)entityEvents.TryGetC(typeof(T));
+            EntityEvents<T>? ee = (EntityEvents<T>?)entityEvents.TryGetC(typeof(T));
 
             if (ee == null)
                 return null;
@@ -181,11 +181,11 @@ internal IDisposable OnPreUnsafeDelete<T>(IQueryable<T> entityQuery) where T : E
             return ee.OnPreUnsafeDelete(entityQuery);
         }
 
-        internal IDisposable OnPreUnsafeMListDelete<T>(IQueryable mlistQuery, IQueryable<T> entityQuery) where T : Entity
+        internal IDisposable? OnPreUnsafeMListDelete<T>(IQueryable mlistQuery, IQueryable<T> entityQuery) where T : Entity
         {
             AssertAllowed(typeof(T), inUserInterface: false);
 
-            EntityEvents<T> ee = (EntityEvents<T>)entityEvents.TryGetC(typeof(T));
+            EntityEvents<T>? ee = (EntityEvents<T>?)entityEvents.TryGetC(typeof(T));
 
             if (ee == null)
                 return null;
@@ -193,7 +193,7 @@ internal IDisposable OnPreUnsafeMListDelete<T>(IQueryable mlistQuery, IQueryable
             return ee.OnPreUnsafeMListDelete(mlistQuery, entityQuery);
         }
 
-        internal IDisposable OnPreUnsafeUpdate(IUpdateable update)
+        internal IDisposable? OnPreUnsafeUpdate(IUpdateable update)
         {
             var type = update.EntityType;
             if (type.IsInstantiationOf(typeof(MListElement<,>)))
@@ -231,9 +231,9 @@ internal void OnPreBulkInsert(Type type, bool inMListTable)
                 ee.OnPreBulkInsert(inMListTable);
         }
 
-        public ICacheController CacheController(Type type)
+        public ICacheController? CacheController(Type type)
         {
-            IEntityEvents ee = entityEvents.TryGetC(type);
+            IEntityEvents? ee = entityEvents.TryGetC(type);
 
             if (ee == null)
                 return null;
@@ -250,12 +250,12 @@ internal IEnumerable<FieldBinding> GetAdditionalQueryBindings(PropertyRoute pare
                 return Enumerable.Empty<FieldBinding>();
 
             return ee.AdditionalBindings
-                .Where(kvp => kvp.Key.Parent.Equals(parent))
-                .Select(kvp => new FieldBinding(kvp.Key.FieldInfo, new AdditionalFieldExpression(kvp.Key.FieldInfo.FieldType, (PrimaryKeyExpression)id, period, kvp.Key)))
+                .Where(kvp => kvp.Key.Parent!.Equals(parent))
+                .Select(kvp => new FieldBinding(kvp.Key.FieldInfo!, new AdditionalFieldExpression(kvp.Key.FieldInfo!.FieldType, id, period, kvp.Key)))
                 .ToList();
         }
 
-        public List<IAdditionalBinding> GetAdditionalBindings(Type rootType)
+        public List<IAdditionalBinding>? GetAdditionalBindings(Type rootType)
         {
             var ee = entityEvents.TryGetC(rootType);
             if (ee == null || ee.AdditionalBindings == null)
@@ -264,13 +264,13 @@ public List<IAdditionalBinding> GetAdditionalBindings(Type rootType)
             return ee.AdditionalBindings.Values.ToList();
         }
 
-        internal LambdaExpression GetAdditionalQueryBinding(PropertyRoute pr, bool entityCompleter)
+        internal LambdaExpression? GetAdditionalQueryBinding(PropertyRoute pr, bool entityCompleter)
         {
             //AssertAllowed(pr.Type, inUserInterface: false);
 
             var ee = entityEvents.GetOrThrow(pr.RootType);
 
-            var ab = ee.AdditionalBindings.GetOrThrow(pr);
+            var ab = ee.AdditionalBindings!.GetOrThrow(pr);
 
             if (entityCompleter && !ab.ShouldSet())
                 return null;
@@ -278,9 +278,9 @@ internal LambdaExpression GetAdditionalQueryBinding(PropertyRoute pr, bool entit
             return ab.ValueExpression;
         }
 
-        internal CacheControllerBase<T> CacheController<T>() where T : Entity
+        internal CacheControllerBase<T>? CacheController<T>() where T : Entity
         {
-            EntityEvents<T> ee = (EntityEvents<T>)entityEvents.TryGetC(typeof(T));
+            EntityEvents<T>? ee = (EntityEvents<T>?)entityEvents.TryGetC(typeof(T));
 
             if (ee == null)
                 return null;
@@ -288,16 +288,16 @@ internal CacheControllerBase<T> CacheController<T>() where T : Entity
             return ee.CacheController;
         }
 
-        internal FilterQueryResult<T> OnFilterQuery<T>()
+        internal FilterQueryResult<T>? OnFilterQuery<T>()
             where T : Entity
         {
             AssertAllowed(typeof(T), inUserInterface: false);
 
-            EntityEvents<T> ee = (EntityEvents<T>)entityEvents.TryGetC(typeof(T));
+            EntityEvents<T>? ee = (EntityEvents<T>?)entityEvents.TryGetC(typeof(T));
             if (ee == null)
                 return null;
 
-            FilterQueryResult<T> result = null;
+            FilterQueryResult<T>? result = null;
             foreach (var item in ee.OnFilterQuery())
                 result = CombineFilterResult(result, item);
 
@@ -306,21 +306,18 @@ internal FilterQueryResult<T> OnFilterQuery<T>()
 
 
 
-        FilterQueryResult<T> CombineFilterResult<T>(FilterQueryResult<T> result, FilterQueryResult<T> expression)
+        FilterQueryResult<T>? CombineFilterResult<T>(FilterQueryResult<T>? one, FilterQueryResult<T> two)
             where T : Entity
         {
-            if (result == null)
-                return expression;
-
-            if (expression == null)
-                return result;
-
-            if (result.InMemoryFunction == null || expression.InMemoryFunction == null)
-                return new FilterQueryResult<T>(a => result.InDatabaseExpresson.Evaluate(a) && expression.InDatabaseExpresson.Evaluate(a), null);
+            if (one == null)
+                return two;
 
+            if (two == null)
+                return one;
+            
             return new FilterQueryResult<T>(
-                a => result.InDatabaseExpresson.Evaluate(a) && expression.InDatabaseExpresson.Evaluate(a),
-                a => result.InMemoryFunction(a) && expression.InMemoryFunction(a));
+                a => one!.InDatabaseExpresson.Evaluate(a) && two.InDatabaseExpresson.Evaluate(a),
+                a => one!.InMemoryFunction(a) && two!.InMemoryFunction(a));
         }
 
         public Func<T, bool> GetInMemoryFilter<T>(bool userInterface)
@@ -328,11 +325,11 @@ public Func<T, bool> GetInMemoryFilter<T>(bool userInterface)
         {
             using (userInterface ? ExecutionMode.UserInterface() : null)
             {
-                EntityEvents<T> ee = (EntityEvents<T>)entityEvents.TryGetC(typeof(T));
+                EntityEvents<T>? ee = (EntityEvents<T>?)entityEvents.TryGetC(typeof(T));
                 if (ee == null)
                     return a => true;
 
-                Func<T, bool> result = null;
+                Func<T, bool>? result = null;
                 foreach (var item in ee.OnFilterQuery().NotNull())
                 {
                     if (item.InMemoryFunction == null)
@@ -349,25 +346,25 @@ public Func<T, bool> GetInMemoryFilter<T>(bool userInterface)
             }
         }
 
-        private Func<T, bool> CombineFunc<T>(Func<T, bool> result, Func<T, bool> func) where T : Entity
+        private Func<T, bool>? CombineFunc<T>(Func<T, bool>? one, Func<T, bool>? two) where T : Entity
         {
-            if (result == null)
-                return func;
+            if (one == null)
+                return two;
 
-            if (func == null)
-                return result;
+            if (two == null)
+                return one;
 
-            return a => result(a) && func(a);
+            return a => one!(a) && two!(a);
         }
 
-        public Expression<Func<T, bool>> GetInDatabaseFilter<T>()
+        public Expression<Func<T, bool>>? GetInDatabaseFilter<T>()
            where T : Entity
         {
-            EntityEvents<T> ee = (EntityEvents<T>)entityEvents.TryGetC(typeof(T));
+            EntityEvents<T>? ee = (EntityEvents<T>?)entityEvents.TryGetC(typeof(T));
             if (ee == null)
                 return null;
 
-            Expression<Func<T, bool>> result = null;
+            Expression<Func<T, bool>>? result = null;
             foreach (var item in ee.OnFilterQuery().NotNull())
             {
                 result = CombineExpr(result, item.InDatabaseExpresson);
@@ -379,19 +376,19 @@ public Expression<Func<T, bool>> GetInDatabaseFilter<T>()
             return result;
         }
 
-        private Expression<Func<T, bool>> CombineExpr<T>(Expression<Func<T, bool>> result, Expression<Func<T, bool>> func) where T : Entity
+        private Expression<Func<T, bool>>? CombineExpr<T>(Expression<Func<T, bool>>? one, Expression<Func<T, bool>>? two) where T : Entity
         {
-            if (result == null)
-                return func;
+            if (one == null)
+                return two;
 
-            if (func == null)
-                return result;
+            if (two == null)
+                return one;
 
-            return a => result.Evaluate(a) && func.Evaluate(a);
+            return a => one!.Evaluate(a) && two!.Evaluate(a);
         }
 
-        public event Func<Replacements, SqlPreCommand> Synchronizing;
-        public SqlPreCommand SynchronizationScript(bool interactive = true, bool schemaOnly = false, string replaceDatabaseName = null)
+        public event Func<Replacements, SqlPreCommand?> Synchronizing;
+        public SqlPreCommand? SynchronizationScript(bool interactive = true, bool schemaOnly = false, string? replaceDatabaseName = null)
         {
             OnBeforeDatabaseAccess();
 
@@ -401,8 +398,13 @@ public SqlPreCommand SynchronizationScript(bool interactive = true, bool schemaO
             using (CultureInfoUtils.ChangeBothCultures(ForceCultureInfo))
             using (ExecutionMode.Global())
             {
-                Replacements replacements = new Replacements() { Interactive = interactive, ReplaceDatabaseName = replaceDatabaseName, SchemaOnly = schemaOnly };
-                SqlPreCommand command = Synchronizing
+                Replacements replacements = new Replacements()
+                {
+                    Interactive = interactive,
+                    ReplaceDatabaseName = replaceDatabaseName,
+                    SchemaOnly = schemaOnly
+                };
+                SqlPreCommand? command = Synchronizing
                     .GetInvocationListTyped()
                     .Select(e =>
                     {
@@ -453,8 +455,8 @@ public Table View(Type viewType)
             return Views.GetOrCreate(viewType, ViewBuilder.NewView(viewType));
         }
 
-        public event Func<SqlPreCommand> Generating;
-        internal SqlPreCommand GenerationScipt()
+        public event Func<SqlPreCommand?> Generating;
+        internal SqlPreCommand? GenerationScipt()
         {
             OnBeforeDatabaseAccess();
 
@@ -473,7 +475,7 @@ internal SqlPreCommand GenerationScipt()
 
 
 
-        public event Action SchemaCompleted;
+        public event Action? SchemaCompleted;
 
         public void OnSchemaCompleted()
         {
@@ -496,7 +498,7 @@ public void WhenIncluded<T>(Action action) where T : Entity
             };
         }
 
-        public event Action BeforeDatabaseAccess;
+        public event Action? BeforeDatabaseAccess;
 
         public void OnBeforeDatabaseAccess()
         {
@@ -513,7 +515,7 @@ public void OnBeforeDatabaseAccess()
             BeforeDatabaseAccess = null;
         }
 
-        public event Action Initializing;
+        public event Action? Initializing;
 
         public void Initialize()
         {
@@ -540,6 +542,7 @@ static Schema()
 
         internal Schema(SchemaSettings settings)
         {
+            this.typeCachesLazy = null!;
             this.Settings = settings;
             this.Assets = new SchemaAssets();
             this.ViewBuilder = new Maps.ViewBuilder(this);
@@ -584,8 +587,8 @@ public Table Table(Type type)
 
         internal static Field FindField(IFieldFinder fieldFinder, MemberInfo[] members)
         {
-            IFieldFinder current = fieldFinder;
-            Field result = null;
+            IFieldFinder? current = fieldFinder;
+            Field? result = null;
             foreach (var mi in members)
             {
                 if (current == null)
@@ -596,13 +599,13 @@ internal static Field FindField(IFieldFinder fieldFinder, MemberInfo[] members)
                 current = result as IFieldFinder;
             }
 
-            return result;
+            return result!;
         }
 
-        internal static Field TryFindField(IFieldFinder fieldFinder, MemberInfo[] members)
+        internal static Field? TryFindField(IFieldFinder fieldFinder, MemberInfo[] members)
         {
-            IFieldFinder current = fieldFinder;
-            Field result = null;
+            IFieldFinder? current = fieldFinder;
+            Field? result = null;
             foreach (var mi in members)
             {
                 if (current == null)
@@ -619,7 +622,7 @@ internal static Field TryFindField(IFieldFinder fieldFinder, MemberInfo[] member
             return result;
         }
 
-        public Dictionary<PropertyRoute, Implementations> FindAllImplementations(Type root)
+        public Dictionary<PropertyRoute, Implementations>? FindAllImplementations(Type root)
         {
             try
             {
@@ -643,14 +646,14 @@ public Dictionary<PropertyRoute, Implementations> FindAllImplementations(Type ro
         public Implementations FindImplementations(PropertyRoute route)
         {
             if (route.PropertyRouteType == PropertyRouteType.LiteEntity)
-                route = route.Parent;
+                route = route.Parent!;
 
             Type type = route.RootType;
 
             if (!Tables.ContainsKey(type))
                 return Schema.Current.Settings.GetImplementations(route);
 
-            Field field = TryFindField(Table(type), route.Members);
+            Field? field = TryFindField(Table(type), route.Members);
             //if (field == null)
             //    return Implementations.ByAll;
 
@@ -687,13 +690,13 @@ public Implementations FindImplementations(PropertyRoute route)
             if (route.PropertyRouteType != PropertyRouteType.FieldOrProperty)
                 return null;
 
-            var lambda = ExpressionCleaner.GetFieldExpansion(route.Parent.Type, route.PropertyInfo);
+            var lambda = ExpressionCleaner.GetFieldExpansion(route.Parent!.Type, route.PropertyInfo!);
             if (lambda == null)
                 return null;
 
-            Expression e = MetadataVisitor.JustVisit(lambda, new MetaExpression(route.Parent.Type, new CleanMeta(route.Parent.TryGetImplementations(), new[] { route.Parent })));
+            Expression e = MetadataVisitor.JustVisit(lambda, new MetaExpression(route.Parent!.Type, new CleanMeta(route.Parent!.TryGetImplementations(), new[] { route.Parent! })));
 
-            MetaExpression me = e as MetaExpression;
+            MetaExpression? me = e as MetaExpression;
             if (me == null)
                 return null;
 
@@ -714,7 +717,7 @@ public Field Field(PropertyRoute route)
             return FindField(Table(route.RootType), route.Members);
         }
 
-        public Field TryField(PropertyRoute route)
+        public Field? TryField(PropertyRoute route)
         {
             return TryFindField(Table(route.RootType), route.Members);
         }
@@ -738,9 +741,9 @@ public bool HasSomeIndex(PropertyRoute route)
 
             ITable table = mlistPr == null ?
                 (ITable)Table(route.RootType) :
-                (ITable)((FieldMList)Field(mlistPr.Parent)).TableMList;
+                (ITable)((FieldMList)Field(mlistPr.Parent!)).TableMList;
 
-            return table.MultiColumnIndexes != null && table.MultiColumnIndexes.Any(index => index.Columns.Any(cols.Contains));
+            return table.MultiColumnIndexes != null && table.MultiColumnIndexes.Any(index => index.Columns.Any(c => cols.Contains(c)));
         }
 
         public override string ToString()
@@ -759,9 +762,9 @@ public IEnumerable<ITable> GetDatabaseTables()
             }
         }
 
-        public Func<DatabaseName, bool> IsExternalDatabase = db => false;
+        public Func<DatabaseName?, bool> IsExternalDatabase = db => false;
 
-        public List<DatabaseName> DatabaseNames()
+        public List<DatabaseName?> DatabaseNames()
         {
             return GetDatabaseTables().Select(a => a.Name.Schema?.Database).Where(a => !IsExternalDatabase(a)).Distinct().ToList();
         }
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
index 9d69dee8fa..31097591f2 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
@@ -66,7 +66,7 @@ public Schema Schema
         }
 
 
-        public UniqueIndex AddUniqueIndex<T>(Expression<Func<T, object>> fields, Expression<Func<T, bool>> where = null, Expression<Func<T, object>> includeFields = null) where T : Entity
+        public UniqueIndex AddUniqueIndex<T>(Expression<Func<T, object>> fields, Expression<Func<T, bool>>? where = null, Expression<Func<T, object>>? includeFields = null) where T : Entity
         {
             var table = Schema.Table<T>();
 
@@ -89,7 +89,9 @@ public UniqueIndex AddUniqueIndex<T>(Expression<Func<T, object>> fields, Express
             return index;
         }
 
-        public Index AddIndex<T>(Expression<Func<T, object>> fields, Expression<Func<T, bool>> where = null, Expression<Func<T, object>> includeFields = null) where T : Entity
+        public Index AddIndex<T>(Expression<Func<T, object>> fields, 
+            Expression<Func<T, bool>>? where = null, 
+            Expression<Func<T, object>>? includeFields = null) where T : Entity
         {
             var table = Schema.Table<T>();
 
@@ -116,8 +118,8 @@ public Index AddIndex<T>(Expression<Func<T, object>> fields, Expression<Func<T,
 
         public UniqueIndex AddUniqueIndexMList<T, V>(Expression<Func<T, MList<V>>> toMList,
             Expression<Func<MListElement<T, V>, object>> fields,
-            Expression<Func<MListElement<T, V>, bool>> where = null,
-            Expression<Func<MListElement<T, V>, object>> includeFields = null)
+            Expression<Func<MListElement<T, V>, bool>>? where = null,
+            Expression<Func<MListElement<T, V>, object>>? includeFields = null)
             where T : Entity
         {
             TableMList table = ((FieldMList)Schema.FindField(Schema.Table(typeof(T)), Reflector.GetMemberList(toMList))).TableMList;
@@ -146,8 +148,8 @@ public UniqueIndex AddUniqueIndexMList<T, V>(Expression<Func<T, MList<V>>> toMLi
 
         public Index AddIndexMList<T, V>(Expression<Func<T, MList<V>>> toMList,
             Expression<Func<MListElement<T, V>, object>> fields,
-            Expression<Func<MListElement<T, V>, bool>> where = null,
-             Expression<Func<MListElement<T, V>, object>> includeFields = null)
+            Expression<Func<MListElement<T, V>, bool>>? where = null,
+            Expression<Func<MListElement<T, V>, object>>? includeFields = null)
             where T : Entity
         {
             TableMList table = ((FieldMList)Schema.FindField(Schema.Table(typeof(T)), Reflector.GetMemberList(toMList))).TableMList;
@@ -223,7 +225,7 @@ public virtual Table Include(Type type)
 
 
 
-        internal protected virtual Table Include(Type type, PropertyRoute route)
+        internal protected virtual Table Include(Type type, PropertyRoute? route)
         {
             if (schema.Tables.TryGetValue(type, out Table result))
                 return result;
@@ -290,25 +292,20 @@ void Complete(Table table)
             }
         }
 
-        public SystemVersionedInfo ToSystemVersionedInfo(SystemVersionedAttribute att, ObjectName tableName)
+        public SystemVersionedInfo? ToSystemVersionedInfo(SystemVersionedAttribute att, ObjectName tableName)
         {
             if (att == null)
                 return null;
 
-            return new SystemVersionedInfo
-            {
-                TableName = att.TemporalTableName != null ?
-                    ObjectName.Parse(att.TemporalTableName) :
-                    new ObjectName(tableName.Schema, tableName.Name + "_History"),
+            var tn = att.TemporalTableName != null ? ObjectName.Parse(att.TemporalTableName) :
+                    new ObjectName(tableName.Schema, tableName.Name + "_History");
 
-                StartColumnName = att.StartDateColumnName,
-                EndColumnName = att.EndDateColumnName,
-            };
+            return new SystemVersionedInfo(tn, att.StartDateColumnName, att.EndDateColumnName);
         }
 
-        private Dictionary<Type, FieldMixin> GenerateMixins(PropertyRoute propertyRoute, Table table, NameSequence nameSequence)
+        private Dictionary<Type, FieldMixin>? GenerateMixins(PropertyRoute propertyRoute, Table table, NameSequence nameSequence)
         {
-            Dictionary<Type, FieldMixin> mixins = null;
+            Dictionary<Type, FieldMixin>? mixins = null;
             foreach (var t in MixinDeclarations.GetMixinDeclarations(table.Type))
             {
                 if (mixins == null)
@@ -320,7 +317,7 @@ private Dictionary<Type, FieldMixin> GenerateMixins(PropertyRoute propertyRoute,
             return mixins;
         }
 
-        public HeavyProfiler.Tracer Tracer { get; set; }
+        public HeavyProfiler.Tracer? Tracer { get; set; }
 
 
         public HashSet<(Type type, string method)> LoadedModules = new HashSet<(Type type, string method)>();
@@ -371,7 +368,7 @@ protected Dictionary<string, EntityField> GenerateFields(PropertyRoute root, ITa
 
                         Field field = GenerateField(table, route, preName, forceNull, inMList);
 
-                        result.Add(fiId.Name, new EntityField(type, fiId) { Field = field });
+                        result.Add(fiId.Name, new EntityField(type, fiId, field));
                     }
 
                     TicksColumnAttribute t = type.GetCustomAttribute<TicksColumnAttribute>();
@@ -381,11 +378,10 @@ protected Dictionary<string, EntityField> GenerateFields(PropertyRoute root, ITa
 
                         Field field = GenerateField(table, route, preName, forceNull, inMList);
 
-                        result.Add(fiTicks.Name, new EntityField(type, fiTicks) { Field = field });
+                        result.Add(fiTicks.Name, new EntityField(type, fiTicks, field));
                     }
 
-                    Expression exp = ExpressionCleaner.GetFieldExpansion(type, EntityExpression.ToStringMethod);
-
+                    Expression? exp = ExpressionCleaner.GetFieldExpansion(type, EntityExpression.ToStringMethod);
                     if (exp == null)
                     {
                         PropertyRoute route = root.Add(fiToStr);
@@ -395,7 +391,7 @@ protected Dictionary<string, EntityField> GenerateFields(PropertyRoute root, ITa
                         if (result.ContainsKey(fiToStr.Name))
                             throw new InvalidOperationException("Duplicated field with name {0} on {1}, shadowing not supported".FormatWith(fiToStr.Name, type.TypeName()));
 
-                        result.Add(fiToStr.Name, new EntityField(type, fiToStr) { Field = field });
+                        result.Add(fiToStr.Name, new EntityField(type, fiToStr, field));
                     }
                 }
 
@@ -413,7 +409,7 @@ protected Dictionary<string, EntityField> GenerateFields(PropertyRoute root, ITa
                         if (result.ContainsKey(fi.Name))
                             throw new InvalidOperationException("Duplicated field with name '{0}' on '{1}', shadowing not supported".FormatWith(fi.Name, type.TypeName()));
 
-                        var ef = new EntityField(type, fi) { Field = field };
+                        var ef = new EntityField(type, fi, field);
 
                         if (field is FieldMList fml)
                             fml.TableMList.PropertyRoute = route;
@@ -526,10 +522,8 @@ protected virtual Field GenerateFieldPrimaryKey(Table table, PropertyRoute route
 
             SqlDbTypePair pair = Settings.GetSqlDbType(attr, attr.Type);
 
-            return table.PrimaryKey = new FieldPrimaryKey(route, table)
+            return table.PrimaryKey = new FieldPrimaryKey(route, table, attr.Name, attr.Type)
             {
-                Name = attr.Name,
-                Type = attr.Type,
                 SqlDbType = pair.SqlDbType,
                 Collation = Settings.GetCollate(attr),
                 UserDefinedTypeName = pair.UserDefinedTypeName,
@@ -562,10 +556,10 @@ protected virtual FieldValue GenerateFieldTicks(Table table, PropertyRoute route
 
             SqlDbTypePair pair = Settings.GetSqlDbType(ticksAttr, type);
 
-            return table.Ticks = new FieldTicks(route)
+            string ticksName = ticksAttr?.Name ?? name.ToString();
+
+            return table.Ticks = new FieldTicks(route, type, ticksName)
             {
-                Type = type,
-                Name = ticksAttr?.Name ?? name.ToString(),
                 SqlDbType = pair.SqlDbType,
                 Collation = Settings.GetCollate(ticksAttr),
                 UserDefinedTypeName = pair.UserDefinedTypeName,
@@ -582,9 +576,8 @@ protected virtual FieldValue GenerateFieldValue(ITable table, PropertyRoute rout
 
             SqlDbTypePair pair = Settings.GetSqlDbType(att, route.Type);
 
-            return new FieldValue(route)
+            return new FieldValue(route, null, name.ToString())
             {
-                Name = name.ToString(),
                 SqlDbType = pair.SqlDbType,
                 Collation = Settings.GetCollate(att),
                 UserDefinedTypeName = pair.UserDefinedTypeName,
@@ -603,12 +596,10 @@ protected virtual FieldEnum GenerateFieldEnum(ITable table, PropertyRoute route,
 
             var referenceTable = Include(EnumEntity.Generate(cleanEnum), route);
 
-            return new FieldEnum(route)
+            return new FieldEnum(route, name.ToString(), referenceTable)
             {
-                Name = name.ToString(),
                 Nullable = Settings.GetIsNullable(route, forceNull),
                 IsLite = false,
-                ReferenceTable = referenceTable,
                 AvoidForeignKey = Settings.FieldAttribute<AvoidForeignKeyAttribute>(route) != null,
                 Default = att?.Default,
             }.Do(f => f.UniqueIndex = f.GenerateUniqueIndex(table, Settings.FieldAttribute<UniqueIndexAttribute>(route)));
@@ -620,12 +611,10 @@ protected virtual FieldReference GenerateFieldReference(ITable table, PropertyRo
 
             var nullable = Settings.GetIsNullable(route, forceNull);
 
-            return new FieldReference(route)
+            return new FieldReference(route, null, name.ToString(), referenceTable)
             {
-                Name = name.ToString(),
                 Nullable = nullable,
                 IsLite = route.Type.IsLite(),
-                ReferenceTable = referenceTable,
                 AvoidForeignKey = Settings.FieldAttribute<AvoidForeignKeyAttribute>(route) != null,
                 AvoidExpandOnRetrieving = Settings.FieldAttribute<AvoidExpandQueryAttribute>(route) != null,
                 Default = Settings.FieldAttribute<SqlDbTypeAttribute>(route)?.Default
@@ -648,16 +637,18 @@ protected virtual FieldImplementedBy GenerateFieldImplementedBy(ITable table, Pr
 
             bool avoidForeignKey = Settings.FieldAttribute<AvoidForeignKeyAttribute>(route) != null;
 
-            return new FieldImplementedBy(route)
+            var implementations = types.ToDictionary(t => t, t => new ImplementationColumn(
+                name: name.Add(TypeLogic.GetCleanName(t)).ToString(),
+                referenceTable: Include(t, route)
+                )
+            {
+                Nullable = nullable,
+                AvoidForeignKey = avoidForeignKey,
+            });
+
+            return new FieldImplementedBy(route, implementations)
             {
                 SplitStrategy = strategy,
-                ImplementationColumns = types.ToDictionary(t => t, t => new ImplementationColumn
-                {
-                    ReferenceTable = Include(t, route),
-                    Name = name.Add(TypeLogic.GetCleanName(t)).ToString(),
-                    Nullable = nullable,
-                    AvoidForeignKey = avoidForeignKey,
-                }),
                 IsLite = route.Type.IsLite(),
                 AvoidExpandOnRetrieving = Settings.FieldAttribute<AvoidExpandQueryAttribute>(route) != null
             }.Do(f => f.UniqueIndex = f.GenerateUniqueIndex(table, Settings.FieldAttribute<UniqueIndexAttribute>(route)));
@@ -667,21 +658,20 @@ protected virtual FieldImplementedByAll GenerateFieldImplementedByAll(PropertyRo
         {
             var nullable = Settings.GetIsNullable(route, forceNull);
 
-            return new FieldImplementedByAll(route)
+            var column = new ImplementationStringColumn(preName.ToString())
+            {
+                Nullable = nullable,
+                Size = Settings.DefaultImplementedBySize,
+            };
+
+            var columnType = new ImplementationColumn(preName.Add("Type").ToString(), Include(typeof(TypeEntity), route))
+            {
+                Nullable = nullable,
+                AvoidForeignKey = Settings.FieldAttribute<AvoidForeignKeyAttribute>(route) != null,
+            };
+
+            return new FieldImplementedByAll(route, column, columnType)
             {
-                Column = new ImplementationStringColumn
-                {
-                    Name = preName.ToString(),
-                    Nullable = nullable,
-                    Size = Settings.DefaultImplementedBySize,
-                },
-                ColumnType = new ImplementationColumn
-                {
-                    Name = preName.Add("Type").ToString(),
-                    Nullable = nullable,
-                    ReferenceTable = Include(typeof(TypeEntity), route),
-                    AvoidForeignKey = Settings.FieldAttribute<AvoidForeignKeyAttribute>(route) != null,
-                },
                 IsLite = route.Type.IsLite(),
                 AvoidExpandOnRetrieving = Settings.FieldAttribute<AvoidExpandQueryAttribute>(route) != null
             }.Do(f => f.UniqueIndex = f.GenerateUniqueIndex(table, Settings.FieldAttribute<UniqueIndexAttribute>(route)));
@@ -692,18 +682,17 @@ protected virtual FieldMList GenerateFieldMList(Table table, PropertyRoute route
             Type elementType = route.Type.ElementType();
 
             if (table.Ticks == null)
-                throw new InvalidOperationException("Type '{0}' has field '{1}' but does not Ticks. MList requires concurrency control.".FormatWith(route.Parent.Type.TypeName(), route.FieldInfo.FieldName()));
+                throw new InvalidOperationException("Type '{0}' has field '{1}' but does not Ticks. MList requires concurrency control.".FormatWith(route.Parent!.Type.TypeName(), route.FieldInfo!.FieldName()));
 
             var orderAttr = Settings.FieldAttribute<PreserveOrderAttribute>(route);
 
-            FieldValue order = null;
+            FieldValue? order = null;
             if (orderAttr != null)
             {
                 var pair = Settings.GetSqlDbTypePair(typeof(int));
 
-                order = new FieldValue(route: null, fieldType:  typeof(int))
+                order = new FieldValue(route: null!, fieldType:  typeof(int), orderAttr.Name ?? "Order")
                 {
-                    Name = orderAttr.Name ?? "Order",
                     SqlDbType = pair.SqlDbType,
                     Collation = Settings.GetCollate(orderAttr),
                     UserDefinedTypeName = pair.UserDefinedTypeName,
@@ -718,10 +707,8 @@ protected virtual FieldMList GenerateFieldMList(Table table, PropertyRoute route
             {
                 var pair = Settings.GetSqlDbType(keyAttr, keyAttr.Type);
 
-                primaryKey = new TableMList.PrimaryKeyColumn
+                primaryKey = new TableMList.PrimaryKeyColumn(keyAttr.Type, keyAttr.Name)
                 {
-                    Name = keyAttr.Name,
-                    Type = keyAttr.Type,
                     SqlDbType = pair.SqlDbType,
                     Collation = Settings.GetCollate(orderAttr),
                     UserDefinedTypeName = pair.UserDefinedTypeName,
@@ -730,36 +717,33 @@ protected virtual FieldMList GenerateFieldMList(Table table, PropertyRoute route
                 };
             }
 
-            TableMList relationalTable = new TableMList(route.Type)
+            var tableName = GenerateTableNameCollection(table, name, Settings.FieldAttribute<TableNameAttribute>(route));
+
+            var backReference = new FieldReference(route: null!, fieldType: table.Type,
+                    name: GenerateBackReferenceName(table.Type, Settings.FieldAttribute<BackReferenceColumnNameAttribute>(route)),
+                    referenceTable: table
+                )
             {
-                Name = GenerateTableNameCollection(table, name, Settings.FieldAttribute<TableNameAttribute>(route)),
-                PrimaryKey = primaryKey,
-                BackReference = new FieldReference(route: null, fieldType: table.Type)
-                {
-                    Name = GenerateBackReferenceName(table.Type, Settings.FieldAttribute<BackReferenceColumnNameAttribute>(route)),
-                    ReferenceTable = table,
-                    AvoidForeignKey = Settings.FieldAttribute<AvoidForeignKeyAttribute>(route) != null,
-                },
-                Order = order,
+                AvoidForeignKey = Settings.FieldAttribute<AvoidForeignKeyAttribute>(route) != null,
             };
 
-            relationalTable.Field = GenerateField(relationalTable, route.Add("Item"), NameSequence.Void, forceNull: false, inMList: true);
-
-            if(relationalTable.Field is FieldEmbedded fe && fe.HasValue != null)
+            TableMList mlistTable = new TableMList(route.Type, tableName, primaryKey, backReference)
             {
+                Order = order,
+            };
 
-            }
-
+            mlistTable.Field = GenerateField(mlistTable, route.Add("Item"), NameSequence.Void, forceNull: false, inMList: true);
+            
             var sysAttribute = Settings.FieldAttribute<SystemVersionedAttribute>(route) ??
                 (Settings.TypeAttribute<SystemVersionedAttribute>(table.Type) != null ? new SystemVersionedAttribute() : null);
 
-            relationalTable.SystemVersioned = ToSystemVersionedInfo(sysAttribute, relationalTable.Name);
+            mlistTable.SystemVersioned = ToSystemVersionedInfo(sysAttribute, mlistTable.Name);
 
-            relationalTable.GenerateColumns();
+            mlistTable.GenerateColumns();
 
-            return new FieldMList(route)
+            return new FieldMList(route, mlistTable)
             {
-                TableMList = relationalTable,
+                TableMList = mlistTable,
             };
         }
 
@@ -767,19 +751,16 @@ protected virtual FieldEmbedded GenerateFieldEmbedded(ITable table, PropertyRout
         {
             var nullable = Settings.GetIsNullable(route, false);
 
-            return new FieldEmbedded(route)
-            {
-                HasValue = nullable.ToBool() ? new FieldEmbedded.EmbeddedHasValueColumn() { Name = name.Add("HasValue").ToString() } : null,
-                EmbeddedFields = GenerateFields(route, table, name, forceNull: nullable.ToBool() || forceNull, inMList: inMList)
-            };
+            var hasValue = nullable.ToBool() ? new FieldEmbedded.EmbeddedHasValueColumn(name.Add("HasValue").ToString()) : null;
+
+            var embeddedFields = GenerateFields(route, table, name, forceNull: nullable.ToBool() || forceNull, inMList: inMList);
+
+            return new FieldEmbedded(route, hasValue, embeddedFields);
         }
 
         protected virtual FieldMixin GenerateFieldMixin(PropertyRoute route, NameSequence name, Table table)
         {
-            return new FieldMixin(route, table)
-            {
-                Fields = GenerateFields(route, table, name, forceNull: false, inMList: false)
-            };
+            return new FieldMixin(route, table, GenerateFields(route, table, name, forceNull: false, inMList: false));
         }
         #endregion
 
@@ -814,8 +795,8 @@ public virtual ObjectName GenerateTableName(Type type, TableNameAttribute tn)
 
         private SchemaName GetSchemaName(TableNameAttribute tn)
         {
-            ServerName server = tn.ServerName == null ? null : new ServerName(tn.ServerName);
-            DatabaseName dataBase = tn.DatabaseName == null && server == null ? null : new DatabaseName(server, tn.DatabaseName);
+            ServerName? server = tn.ServerName == null ? null : new ServerName(tn.ServerName);
+            DatabaseName? dataBase = tn.DatabaseName == null && server == null ? null : new DatabaseName(server, tn.DatabaseName);
             SchemaName schema = tn.SchemaName == null && dataBase == null ? SchemaName.Default : new SchemaName(dataBase, tn.SchemaName);
             return schema;
         }
@@ -847,7 +828,7 @@ public virtual string GenerateMListFieldName(PropertyRoute route, KindOfField ki
         public virtual string GenerateFieldName(PropertyRoute route, KindOfField kindOfField)
         {
             string name = route.PropertyInfo != null ? (route.PropertyInfo.Name.TryAfterLast('.') ?? route.PropertyInfo.Name)
-                : route.FieldInfo.Name.FirstUpper();
+                : route.FieldInfo!.Name.FirstUpper();
 
             switch (kindOfField)
             {
@@ -861,7 +842,7 @@ public virtual string GenerateFieldName(PropertyRoute route, KindOfField kindOfF
                 case KindOfField.Enum:
                     return name + "ID";
                 default:
-                    throw new InvalidOperationException("No name for {0} defined".FormatWith(route.FieldInfo.Name));
+                    throw new InvalidOperationException("No name for {0} defined".FormatWith(route.FieldInfo!.Name));
             }
         }
 
@@ -879,7 +860,9 @@ public void SwitchGlobalLazyManager(GlobalLazyManager manager)
             GlobalLazyManager = manager;
         }
 
-        public ResetLazy<T> GlobalLazy<T>(Func<T> func, InvalidateWith invalidateWith, Action onInvalidated = null, LazyThreadSafetyMode mode = LazyThreadSafetyMode.ExecutionAndPublication) where T : class
+        public ResetLazy<T> GlobalLazy<T>(Func<T> func, InvalidateWith invalidateWith, 
+            Action? onInvalidated = null, 
+            LazyThreadSafetyMode mode = LazyThreadSafetyMode.ExecutionAndPublication) where T : class
         {
             var result = Signum.Engine.GlobalLazy.WithoutInvalidations(() =>
             {
@@ -1007,7 +990,7 @@ public override ObjectName GenerateTableName(Type type, TableNameAttribute tn)
             {
                 if (tn.SchemaName == "sys")
                 {
-                    DatabaseName db = Administrator.sysViewDatabase.Value;
+                    DatabaseName? db = Administrator.sysViewDatabase.Value;
 
                     return new ObjectName(new SchemaName(db, tn.SchemaName ?? "dbo"), tn.Name);
                 }
@@ -1045,12 +1028,10 @@ protected override FieldEnum GenerateFieldEnum(ITable table, PropertyRoute route
 
             //var referenceTable = Include(EnumEntity.Generate(cleanEnum), route);
 
-            return new FieldEnum(route)
+            return new FieldEnum(route, name.ToString(), null! /*referenceTable*/)
             {
-                Name = name.ToString(),
                 Nullable = Settings.GetIsNullable(route, forceNull),
                 IsLite = false,
-                ReferenceTable = null,//referenceTable,
                 AvoidForeignKey = Settings.FieldAttribute<AvoidForeignKeyAttribute>(route) != null,
                 Default = att?.Default,
             }.Do(f => f.UniqueIndex = f.GenerateUniqueIndex(table, Settings.FieldAttribute<UniqueIndexAttribute>(route)));
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
index add74e7c0c..3fe6d3da44 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
@@ -276,7 +276,7 @@ internal SqlDbTypePair GetSqlDbType(SqlDbTypeAttribute att, Type type)
             return GetSqlDbTypePair(type.UnNullify());
         }
 
-        internal int? GetSqlSize(SqlDbTypeAttribute att, PropertyRoute route, SqlDbType sqlDbType)
+        internal int? GetSqlSize(SqlDbTypeAttribute att, PropertyRoute? route, SqlDbType sqlDbType)
         {
             if (att != null && att.HasSize)
                 return att.Size;
diff --git a/Signum.Engine/Signum.Engine.csproj b/Signum.Engine/Signum.Engine.csproj
index 9c02d6cd47..b309f217c9 100644
--- a/Signum.Engine/Signum.Engine.csproj
+++ b/Signum.Engine/Signum.Engine.csproj
@@ -2,8 +2,10 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp2.2</TargetFramework>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>8.0</LangVersion>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
+    <NullableReferenceTypes>true</NullableReferenceTypes>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
diff --git a/Signum.Entities/Basics/Type.cs b/Signum.Entities/Basics/Type.cs
index 7d05422b92..465fe3549f 100644
--- a/Signum.Entities/Basics/Type.cs
+++ b/Signum.Entities/Basics/Type.cs
@@ -43,13 +43,13 @@ public bool IsType(Type type)
             return ClassName == type.Name && Namespace == type.Namespace;
         }
 
-        public static Func<Type, TypeEntity> ToTypeEntityFunc = t => { throw new InvalidOperationException("Lite.ToTypeDNFunc is not set"); };
-        public static Func<TypeEntity, Type> ToTypeFunc = t => { throw new InvalidOperationException("Lite.ToTypeFunc is not set"); };
-        public static Func<string, Type> TryGetType = s => { throw new InvalidOperationException("Lite.TryGetType is not set"); };
-        public static Func<Type, string> GetCleanName = s => { throw new InvalidOperationException("Lite.GetCleanName is not set"); };
+        public static Func<Type, TypeEntity> ToTypeEntityFunc = t => { throw new InvalidOperationException("TypeEntity.ToTypeEntityFunc is not set"); };
+        public static Func<TypeEntity, Type> ToTypeFunc = t => { throw new InvalidOperationException("TypeEntity.ToTypeFunc is not set"); };
+        public static Func<string, Type?> TryGetType = s => { throw new InvalidOperationException("TypeEntity.TryGetType is not set"); };
+        public static Func<Type, string> GetCleanName = s => { throw new InvalidOperationException("TypeEntity.GetCleanName is not set"); };
 
         public static bool AlreadySet { get; private set; }
-        public static void SetTypeNameCallbacks(Func<Type, string> getCleanName, Func<string, Type> tryGetType)
+        public static void SetTypeNameCallbacks(Func<Type, string> getCleanName, Func<string, Type?> tryGetType)
         {
             TypeEntity.GetCleanName = getCleanName;
             TypeEntity.TryGetType = tryGetType;
diff --git a/Signum.Entities/DynamicQuery/Tokens/ExtensionDictionaryToken.cs b/Signum.Entities/DynamicQuery/Tokens/ExtensionDictionaryToken.cs
index ac0dc0d7a0..d2b329a907 100644
--- a/Signum.Entities/DynamicQuery/Tokens/ExtensionDictionaryToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/ExtensionDictionaryToken.cs
@@ -8,15 +8,16 @@ namespace Signum.Entities.DynamicQuery
 {
     [Serializable]
     public class ExtensionDictionaryToken<T, K, V> : QueryToken
-        where K : Object
+        where K : object
     {
         QueryToken parent;
         public override QueryToken? Parent => parent;
 
         public ExtensionDictionaryToken(QueryToken parent, K key,
-            string unit, string format,
+            string? unit, 
+            string? format,
             Implementations? implementations,
-            PropertyRoute propertyRoute, 
+            PropertyRoute? propertyRoute, 
             Expression<Func<T, V>> lambda)
         {
             this.keyValue= key;
@@ -44,10 +45,10 @@ public override string NiceName()
         K keyValue;
         public override string Key => "[" + keyValue.ToString() + "]";
 
-        string format;
+        string? format;
         public override string? Format => format;
 
-        string unit;
+        string? unit;
         public override string? Unit => unit;
 
         protected override List<QueryToken> SubTokensOverride(SubTokensOptions options)
@@ -63,10 +64,10 @@ protected override Expression BuildExpressionInternal(BuildExpressionContext con
 
             var result = Expression.Invoke(Lambda, parentExpression);
 
-            return result.BuildLiteNulifyUnwrapPrimaryKey(new[] { this.propertyRoute });
+            return result.BuildLiteNulifyUnwrapPrimaryKey(new[] { this.propertyRoute! });
         }
 
-        public PropertyRoute propertyRoute;
+        public PropertyRoute? propertyRoute;
         public override PropertyRoute? GetPropertyRoute() => this.propertyRoute;
 
         public Implementations? implementations;
diff --git a/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs b/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
index b3c64cd87f..8b1f462646 100644
--- a/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
@@ -15,7 +15,7 @@ public class ExtensionToken : QueryToken
 
         public ExtensionToken(QueryToken parent, string key, Type type, bool isProjection,
             string? unit, string? format, Implementations? implementations,
-            string? isAllowed, PropertyRoute propertyRoute, string displayName)
+            string? isAllowed, PropertyRoute? propertyRoute, string displayName)
         {
             this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
 
@@ -81,10 +81,10 @@ protected override Expression BuildExpressionInternal(BuildExpressionContext con
 
             var result = BuildExtension(parent.Type.CleanType().UnNullify(), Key, parentExpression);
 
-            return result.BuildLiteNulifyUnwrapPrimaryKey(new[] { this.propertyRoute });
+            return result.BuildLiteNulifyUnwrapPrimaryKey(new[] { this.propertyRoute! });
         }
 
-        public PropertyRoute propertyRoute;
+        public PropertyRoute? propertyRoute;
         public override PropertyRoute? GetPropertyRoute()
         {
             return isProjection ? null : propertyRoute;
diff --git a/Signum.Entities/SystemTime.cs b/Signum.Entities/SystemTime.cs
index 5eb56edf23..ef33aaa475 100644
--- a/Signum.Entities/SystemTime.cs
+++ b/Signum.Entities/SystemTime.cs
@@ -111,7 +111,7 @@ public static Interval<DateTime> SystemPeriod<E, T>(this MListElement<E, T> mlis
 
 
         static MethodInfo miOverlaps = ReflectionTools.GetMethodInfo((Interval<DateTime> pair) => pair.Overlaps(new Interval<DateTime>()));
-        internal static Expression? Overlaps(this NewExpression interval1, NewExpression interval2)
+        internal static Expression? Overlaps(this NewExpression? interval1, NewExpression? interval2)
         {
             if (interval1 == null)
                 return null;
@@ -133,7 +133,7 @@ public static Interval<DateTime> SystemPeriod<E, T>(this MListElement<E, T> mlis
 
 
         static ConstructorInfo ciInterval = ReflectionTools.GetConstuctorInfo(() => new Interval<DateTime>(new DateTime(), new DateTime()));
-        internal static Expression Intesection(this NewExpression interval1, NewExpression interval2)
+        internal static Expression Intesection(this NewExpression? interval1, NewExpression? interval2)
         {
             if (interval1 == null)
                 return interval2;
@@ -151,7 +151,7 @@ internal static Expression Intesection(this NewExpression interval1, NewExpressi
                   Expression.Condition(Expression.GreaterThan(max1, max2), max1, max2));
         }
 
-        public static Expression And(this Expression expression, Expression other)
+        public static Expression And(this Expression expression, Expression? other)
         {
             if (other == null)
                 return expression;
diff --git a/Signum.Utilities/DataStructures/ImmutableStack.cs b/Signum.Utilities/DataStructures/ImmutableStack.cs
index 5341af2f76..077b696ea7 100644
--- a/Signum.Utilities/DataStructures/ImmutableStack.cs
+++ b/Signum.Utilities/DataStructures/ImmutableStack.cs
@@ -8,7 +8,7 @@ namespace Signum.Utilities.DataStructures
    
 
     public class ImmutableStack<T> : IEnumerable<T> 
-        where T : object
+        where T : object /*CSBUG*/
     {
         class ImmutableFullStack : ImmutableStack<T>
         {
diff --git a/Signum.Utilities/Disposable.cs b/Signum.Utilities/Disposable.cs
index 0a7700116a..cddf772f89 100644
--- a/Signum.Utilities/Disposable.cs
+++ b/Signum.Utilities/Disposable.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Runtime.Serialization;
 
 namespace Signum.Utilities
@@ -19,7 +19,7 @@ public void Dispose()
             action?.Invoke();
         }
 
-        public static IDisposable Combine(IDisposable first, IDisposable second)
+        public static IDisposable? Combine(IDisposable? first, IDisposable? second)
         {
             if (first == null || second == null)
                 return first ?? second;
diff --git a/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs b/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs
index 1c0557ba12..d5c645c6fe 100644
--- a/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs
+++ b/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;
@@ -20,7 +20,7 @@ public class ExpressionCleaner : ExpressionVisitor
 
         bool shortCircuit;
 
-        public static Expression Clean(Expression expr)
+        public static Expression? Clean(Expression? expr)
         {
             return Clean(expr, ExpressionEvaluator.PartialEval, true);
         }
@@ -48,15 +48,14 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
 		{
             MethodCallExpression expr = (MethodCallExpression)base.VisitMethodCall(m);
 
-            Expression binded =  BindMethodExpression(expr, false);
-
+            Expression? binded =  BindMethodExpression(expr, false);
             if (binded != null)
                 return Visit(binded);
 
             return expr;
 		}
 
-        public static Expression BindMethodExpression(MethodCallExpression m, bool allowPolymorphics)
+        public static Expression? BindMethodExpression(MethodCallExpression m, bool allowPolymorphics)
         {
             if (m.Method.DeclaringType == typeof(ExpressionExtensions) && m.Method.Name == "Evaluate")
             {
@@ -79,7 +78,7 @@ public static Expression BindMethodExpression(MethodCallExpression m, bool allow
                     Expression[] args = m.Object == null ? m.Arguments.ToArray() : m.Arguments.PreAnd(m.Object).ToArray();
 
                     var type = attribute.ExpanderType.MakeGenericType(m.Method.GetGenericArguments());
-                    GenericMethodExpander expander = Activator.CreateInstance(type) as GenericMethodExpander;
+                    GenericMethodExpander expander = (GenericMethodExpander)Activator.CreateInstance(type);
                     return Expression.Invoke(expander.GenericLambdaExpression, args);
                 }
                 else
@@ -98,7 +97,7 @@ public static Expression BindMethodExpression(MethodCallExpression m, bool allow
                 }
             }
 
-            LambdaExpression lambdaExpression = GetFieldExpansion(m.Object?.Type, m.Method);
+            LambdaExpression? lambdaExpression = GetFieldExpansion(m.Object?.Type, m.Method);
             if (lambdaExpression != null)
             {
                 Expression[] args = m.Object == null ? m.Arguments.ToArray() : m.Arguments.PreAnd(m.Object).ToArray();
@@ -114,24 +113,23 @@ protected override Expression VisitMember(MemberExpression m)
         {
             MemberExpression exp = (MemberExpression)base.VisitMember(m);
 
-            Expression binded = BindMemberExpression(exp, false);
-
+            Expression? binded = BindMemberExpression(exp, false);
             if (binded != null)
                 return Visit(binded);
 
             return exp;
         }
 
-        public static Expression BindMemberExpression(MemberExpression m, bool allowPolymorphics)
+        public static Expression? BindMemberExpression(MemberExpression m, bool allowPolymorphics)
         {
-            PropertyInfo pi = m.Member as PropertyInfo;
+            PropertyInfo? pi = m.Member as PropertyInfo;
             if (pi == null)
                 return null;
 
             if (pi.HasAttributeInherit<PolymorphicExpansionAttribute>() && !allowPolymorphics)
                 return null;
 
-            LambdaExpression lambda = GetFieldExpansion(m.Expression?.Type, pi);
+            LambdaExpression? lambda = GetFieldExpansion(m.Expression?.Type, pi);
             if (lambda == null)
                 return null;
 
@@ -146,13 +144,13 @@ public static bool HasExpansions(Type type, MemberInfo mi)
             return GetFieldExpansion(type, mi) != null || mi is MethodInfo && mi.HasAttribute<MethodExpanderAttribute>();
         }
 
-        public static LambdaExpression GetFieldExpansion(Type decType, MemberInfo mi)
+        public static LambdaExpression? GetFieldExpansion(Type decType, MemberInfo mi)
         {
             if (decType == null || decType == mi.DeclaringType || IsStatic(mi))
                 return GetExpansion(mi);
             else
             {
-                for (MemberInfo m = GetMember(decType, mi); m != null; m = BaseMember(m))
+                for (MemberInfo? m = GetMember(decType, mi); m != null; m = BaseMember(m))
                 {
                     var result = GetExpansion(m);
                     if (result != null)
@@ -174,7 +172,7 @@ static bool IsStatic(MemberInfo mi)
             return false;
         }
 
-        static LambdaExpression GetExpansion(MemberInfo mi)
+        static LambdaExpression? GetExpansion(MemberInfo mi)
         {
             ExpressionFieldAttribute efa = mi.GetCustomAttribute<ExpressionFieldAttribute>();
             if (efa == null)
@@ -203,7 +201,7 @@ static LambdaExpression GetExpansion(MemberInfo mi)
 
         static BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
 
-        static MemberInfo GetMember(Type decType, MemberInfo mi)
+        static MemberInfo? GetMember(Type decType, MemberInfo mi)
         {
             if (mi is MethodInfo)
             {
@@ -235,7 +233,7 @@ static MemberInfo GetMember(Type decType, MemberInfo mi)
             throw new InvalidOperationException("Invalid Member type");
         }
 
-        static MemberInfo BaseMember(MemberInfo mi)
+        static MemberInfo? BaseMember(MemberInfo mi)
         {
             MemberInfo result;
             if (mi is MethodInfo mti)
diff --git a/Signum.Utilities/Extensions/DateTimeExtensions.cs b/Signum.Utilities/Extensions/DateTimeExtensions.cs
index a046e2d3ec..d92f5856e3 100644
--- a/Signum.Utilities/Extensions/DateTimeExtensions.cs
+++ b/Signum.Utilities/Extensions/DateTimeExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.ComponentModel;
 using System.Globalization;
 using System.Linq.Expressions;
@@ -349,7 +349,7 @@ public static string ToAgoString(this DateTime dateTime)
         public static string ToAgoString(this DateTime dateTime, DateTime now)
         {
             TimeSpan ts = now.Subtract(dateTime);
-            string resource = null;
+            string? resource = null;
             if (ts.TotalMilliseconds < 0)
                 resource = DateTimeMessage.In0.NiceToString();
             else
@@ -524,7 +524,7 @@ public DateSpan Invert()
 
         public override string ToString()
         {
-            string result = ", ".Combine(
+            string result = ", ".CombineIfNotEmpty(
                          Years == 0 ? null :
                          Years == 1 ? DateTimeMessage._0Year.NiceToString().FormatWith(Years) :
                                      DateTimeMessage._0Years.NiceToString().FormatWith(Years),
diff --git a/Signum.Utilities/Extensions/EnumerableExtensions.cs b/Signum.Utilities/Extensions/EnumerableExtensions.cs
index 696f25648d..e54f876e11 100644
--- a/Signum.Utilities/Extensions/EnumerableExtensions.cs
+++ b/Signum.Utilities/Extensions/EnumerableExtensions.cs
@@ -372,7 +372,7 @@ public static T Only<T>(this IEnumerable<T> collection)
 
     public static class EnumerableExtensions
     {
-        public static IEnumerable<T> EmptyIfNull<T>(this IEnumerable<T> collection)
+        public static IEnumerable<T> EmptyIfNull<T>(this IEnumerable<T>? collection)
         {
             if (collection == null)
                 return Enumerable.Empty<T>();
@@ -399,12 +399,12 @@ public Expression Expand(Expression instance, Expression[] arguments, MethodInfo
             }
         }
 
-        public static bool IsNullOrEmpty<T>(this IEnumerable<T> collection)
+        public static bool IsNullOrEmpty<T>(this IEnumerable<T>? collection)
         {
             return collection == null || collection.IsEmpty();
         }
 
-        public static bool HasItems<T>(this IEnumerable<T> collection)
+        public static bool HasItems<T>(this IEnumerable<T>? collection)
         {
             return collection != null && collection.Any();
         }
@@ -1117,7 +1117,7 @@ static bool AssertoTwo(bool nextA, bool nextB)
 
         #region Conversions
 
-        public static ReadOnlyCollection<T> ToReadOnly<T>(this IEnumerable<T> collection)
+        public static ReadOnlyCollection<T> ToReadOnly<T>(this IEnumerable<T>? collection)
         {
             return collection == null ? EmptyReadOnlyCollection<T>.Instance :
                 collection as ReadOnlyCollection<T> ??
diff --git a/Signum.Utilities/Extensions/StreamExtensions.cs b/Signum.Utilities/Extensions/StreamExtensions.cs
index 6f2fb6c76b..7ae5153457 100644
--- a/Signum.Utilities/Extensions/StreamExtensions.cs
+++ b/Signum.Utilities/Extensions/StreamExtensions.cs
@@ -82,7 +82,7 @@ public static bool FilesAreEqual(FileInfo first, FileInfo second)
 
         [DebuggerStepThrough]
         public static R Using<T, R>(this T disposable, Func<T, R> function)
-            where T : IDisposable
+            where T : IDisposable? 
         {
             //using (disposable)
             //    return function(disposable);
@@ -108,7 +108,7 @@ public static R Using<T, R>(this T disposable, Func<T, R> function)
 
         [DebuggerStepThrough]
         public static void EndUsing<T>(this T disposable, Action<T> action)
-            where T : IDisposable
+            where T : IDisposable? 
         {
             try
             {
diff --git a/Signum.Utilities/Profiler/HeavyProfiler.cs b/Signum.Utilities/Profiler/HeavyProfiler.cs
index 318656564b..556f5e2d16 100644
--- a/Signum.Utilities/Profiler/HeavyProfiler.cs
+++ b/Signum.Utilities/Profiler/HeavyProfiler.cs
@@ -35,7 +35,7 @@ public static bool Enabled
             }
         }
 
-        static readonly Variable<HeavyProfilerEntry> current = Statics.ThreadVariable<HeavyProfilerEntry>("heavy"); 
+        static readonly Variable<HeavyProfilerEntry?> current = Statics.ThreadVariable<HeavyProfilerEntry?>("heavy"); 
 
         public static readonly List<HeavyProfilerEntry> Entries = new List<HeavyProfilerEntry>();
 
@@ -180,12 +180,12 @@ public void Dispose()
             }
         }
 
-        public static void Switch(this Tracer tracer, string role, Func<string>? additionalData = null)
+        public static void Switch(this Tracer? tracer, string role, Func<string>? additionalData = null)
         {
             if (tracer == null)
                 return;
 
-            bool hasStackTrace = current.Value.StackTrace != null;
+            bool hasStackTrace = current.Value!.StackTrace != null;
 
             tracer.Dispose();
 
@@ -261,7 +261,7 @@ public static XDocument SqlStatisticsXDocument()
 
         public static IOrderedEnumerable<SqlProfileResume> SqlStatistics()
         {
-            var statistics = AllEntries().Where(a => a.Role == "SQL").GroupBy(a => (string)a.AdditionalData).Select(gr =>
+            var statistics = AllEntries().Where(a => a.Role == "SQL").GroupBy(a => a.AdditionalData!).Select(gr =>
                         new SqlProfileResume
                         {
                             Query = gr.Key,
@@ -408,8 +408,8 @@ public XElement ExportXml(bool includeStackTrace)
 
         private XElement StackTraceToXml(StackTrace stackTrace)
         {
-            var frames = (from i in 0.To(StackTrace.FrameCount)
-                          let sf = StackTrace.GetFrame(i)
+            var frames = (from i in 0.To(StackTrace!.FrameCount)
+                          let sf = StackTrace!.GetFrame(i)
                           let mi = sf.GetMethod()                          
                           select new XElement("StackFrame",
                               new XAttribute("Method", mi.DeclaringType?.FullName + "." + mi.Name),
diff --git a/Signum.Utilities/Synchronization/CultureInfoUtils.cs b/Signum.Utilities/Synchronization/CultureInfoUtils.cs
index f67b85d500..f860657b1a 100644
--- a/Signum.Utilities/Synchronization/CultureInfoUtils.cs
+++ b/Signum.Utilities/Synchronization/CultureInfoUtils.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Threading;
 using System.Globalization;
 
@@ -6,7 +6,7 @@ namespace Signum.Utilities
 {
     public static class CultureInfoUtils
     {
-        public static IDisposable ChangeBothCultures(string cultureName)
+        public static IDisposable? ChangeBothCultures(string cultureName)
         {
             if (string.IsNullOrEmpty(cultureName))
                 return null;
@@ -14,7 +14,7 @@ public static IDisposable ChangeBothCultures(string cultureName)
             return ChangeBothCultures(CultureInfo.GetCultureInfo(cultureName));
         }
 
-        public static IDisposable ChangeBothCultures(CultureInfo ci)
+        public static IDisposable? ChangeBothCultures(CultureInfo? ci)
         {
             if (ci == null)
                 return null;
@@ -31,7 +31,7 @@ public static IDisposable ChangeBothCultures(CultureInfo ci)
             });
         }
 
-        public static IDisposable ChangeCulture(string cultureName)
+        public static IDisposable? ChangeCulture(string cultureName)
         {
             if (string.IsNullOrEmpty(cultureName))
                 return null;
@@ -39,7 +39,7 @@ public static IDisposable ChangeCulture(string cultureName)
             return ChangeCulture(CultureInfo.GetCultureInfo(cultureName));
         }
 
-        public static IDisposable ChangeCulture(CultureInfo ci)
+        public static IDisposable? ChangeCulture(CultureInfo ci)
         {
             if (ci == null)
                 return null;
@@ -50,7 +50,7 @@ public static IDisposable ChangeCulture(CultureInfo ci)
             return new Disposable(() => t.CurrentCulture = old);
         }
 
-        public static IDisposable ChangeCultureUI(string cultureName)
+        public static IDisposable? ChangeCultureUI(string cultureName)
         {
             if (string.IsNullOrEmpty(cultureName))
                 return null;
@@ -58,7 +58,7 @@ public static IDisposable ChangeCultureUI(string cultureName)
             return ChangeCultureUI(CultureInfo.GetCultureInfo(cultureName));
         }
 
-        public static IDisposable ChangeCultureUI(CultureInfo ci)
+        public static IDisposable? ChangeCultureUI(CultureInfo? ci)
         {
             if (ci == null)
                 return null;

From 258c508cd681be443dbb5e7c726ac5ed28c66cb5 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Thu, 24 Jan 2019 09:05:48 +0100
Subject: [PATCH 09/25] more on Signum.Engine nullable

---
 Signum.Engine/Basics/ExceptionLogic.cs        |   2 +-
 Signum.Engine/BulkInserter.cs                 | 748 +++++++++---------
 Signum.Engine/CodeGeneration/CodeGenerator.cs |  24 +-
 .../CodeGeneration/EntityCodeGenerator.cs     | 100 ++-
 .../CodeGeneration/LogicCodeGenerator.cs      |  52 +-
 Signum.Engine/Connection/Executor.cs          |   7 +-
 Signum.Engine/Connection/FieldReader.cs       |  20 +-
 Signum.Engine/Connection/Transaction.cs       | 135 ++--
 Signum.Engine/Database.cs                     |  48 +-
 .../DynamicQuery/AutoDynamicQuery.cs          |  16 +-
 .../DynamicQuery/ColumnDescriptionFactory.cs  |   4 +-
 Signum.Engine/DynamicQuery/DynamicQuery.cs    | 127 ++-
 .../DynamicQuery/DynamicQueryContainer.cs     |  24 +-
 .../DynamicQuery/DynamicQueryFluentInclude.cs |   4 +-
 .../DynamicQuery/ExpressionContainer.cs       |   4 +-
 .../DynamicQuery/ManualDynamicQuery.cs        |  12 +-
 Signum.Engine/Engine/Saver.cs                 |   4 +-
 Signum.Engine/Engine/SchemaSynchronizer.cs    |  18 +-
 Signum.Engine/Engine/SqlBuilder.cs            |   2 +-
 Signum.Engine/Engine/Sys.Tables.cs            |   3 +-
 Signum.Engine/EntityCache.cs                  |  31 +-
 Signum.Engine/Exceptions.cs                   |  32 +-
 Signum.Engine/ExecutionContext.cs             |   7 +-
 Signum.Engine/Linq/AliasGenerator.cs          |  16 +-
 Signum.Engine/Linq/DbExpressions.Signum.cs    |  18 +-
 Signum.Engine/Linq/DbExpressions.Sql.cs       |   8 +-
 Signum.Engine/Linq/DbQueryProvider.cs         |   6 +-
 .../AliasProjectionReplacer.cs                |  19 +-
 .../Linq/ExpressionVisitor/AliasReplacer.cs   |  16 +-
 .../ChildProjectionFlattener.cs               |  72 +-
 .../Linq/ExpressionVisitor/ColumnProjector.cs |  45 +-
 .../ExpressionVisitor/ConditionsRewriter.cs   |  22 +-
 .../ExpressionVisitor/DbExpressionComparer.cs |  10 +-
 .../DbExpressionNominator.cs                  |  32 +-
 .../ExpressionVisitor/DbExpressionVisitor.cs  |  14 +-
 .../Linq/ExpressionVisitor/EntityCompleter.cs |  17 +-
 .../Linq/ExpressionVisitor/QueryBinder.cs     |  34 +-
 .../Linq/ExpressionVisitor/QueryFormatter.cs  |  44 +-
 .../Linq/ExpressionVisitor/QueryRebinder.cs   |  22 +-
 .../Linq/ExpressionVisitor/Replacer.cs        |  14 +-
 .../ScalarSubqueryRewriter.cs                 |  17 +-
 .../Linq/ExpressionVisitor/SubqueryRemover.cs |  18 +-
 .../ExpressionVisitor/TranslatorBuilder.cs    | 128 ++-
 .../UpdateDeleteSimplifier.cs                 |  17 +-
 Signum.Engine/Linq/Meta/MetaEvaluator.cs      |  10 +-
 Signum.Engine/Linq/Meta/MetaExpression.cs     |   4 +-
 Signum.Engine/Linq/Meta/MetadataVisitor.cs    |  40 +-
 Signum.Engine/Linq/TranslateResult.cs         |  68 +-
 Signum.Engine/Operations/Graph.cs             | 124 +--
 Signum.Engine/Operations/GraphState.cs        |  60 +-
 Signum.Engine/Operations/Internal.cs          |  20 +-
 Signum.Engine/Operations/OperationLogic.cs    |  74 +-
 Signum.Engine/Patterns/DeletePart.cs          |   8 +-
 Signum.Engine/Retriever.cs                    |  78 +-
 Signum.Engine/Schema/Schema.Expressions.cs    |  73 +-
 Signum.Engine/Schema/Schema.Save.cs           |  26 +-
 Signum.Engine/Schema/Schema.cs                |   2 +-
 .../Schema/SchemaBuilder/NameSequence.cs      |   5 +-
 .../Schema/SchemaBuilder/SchemaBuilder.cs     |   4 +-
 .../SchemaBuilder/SchemaBuilderSettings.cs    |  73 +-
 Signum.Engine/Schema/UniqueIndex.cs           |   2 +-
 Signum.Entities/DynamicQuery/Filter.cs        |  17 +-
 Signum.Entities/DynamicQuery/QueryUtils.cs    |  18 +-
 Signum.Entities/DynamicQuery/ResultTable.cs   |   6 +-
 .../DynamicQuery/Tokens/AggregateToken.cs     |   4 +-
 .../DynamicQuery/Tokens/AsTypeToken.cs        |   2 +-
 .../Tokens/CollectionAnyAllToken.cs           |  16 +-
 .../Tokens/CollectionElementToken.cs          |   7 +-
 .../Tokens/DecimalSpecialTokens.cs            |   2 +-
 .../Tokens/EntityToStringToken.cs             |  18 +-
 .../DynamicQuery/Tokens/ExtensionToken.cs     |   2 +-
 .../DynamicQuery/Tokens/QueryToken.cs         |   2 +-
 Signum.Entities/FieldAttributes.cs            |   4 +-
 .../FieldNotificationAttributes.cs            |   8 +-
 Signum.Entities/Lite.cs                       |   4 +-
 Signum.Entities/MList.cs                      |  10 +-
 Signum.Entities/MixinEntity.cs                |   4 +-
 Signum.Entities/ModifiableEntity.cs           |   8 +-
 Signum.Entities/Patterns/CorruptEntity.cs     |  12 +-
 Signum.Entities/Patterns/LockeableEntity.cs   |   2 +-
 Signum.Entities/PropertyAttributes.cs         |   2 +-
 Signum.Entities/PropertyRoute.cs              |  10 +-
 Signum.Entities/Reflection/GraphExplorer.cs   |   4 +-
 Signum.Entities/Reflection/ModifyInspector.cs |  20 +-
 Signum.Entities/Services/Security.cs          |   7 +-
 Signum.Entities/SystemTime.cs                 |   2 +-
 .../Scripts/Signum.Entities.Basics.ts         |  16 +-
 Signum.React/Scripts/Signum.Entities.ts       |   3 +-
 .../DataStructures/DirectedEdgedGraph.cs      |  13 +-
 .../DataStructures/DirectedGraph.cs           |  11 +-
 .../IntervalDictionaries/CubeDictionary.cs    |   2 +-
 .../IntervalDictionaries/Interval.cs          |   4 +-
 .../IntervalDictionary.cs                     |  10 +-
 .../IntervalDictionaries/SquareDictionary.cs  |   4 +-
 .../DataStructures/RecentsDictionary.cs       |  10 +-
 Signum.Utilities/DescriptionManager.cs        |  75 +-
 Signum.Utilities/Disposable.cs                |   8 +-
 Signum.Utilities/ExpressionExpanderSamples.cs |  25 +-
 .../ExpressionTrees/CSharpRenderer.cs         |   7 +-
 .../ExpandableQueryProvider.cs                |  12 +-
 .../ExpressionTrees/ExpressionCleaner.cs      |  13 +-
 .../ExpressionTrees/ExpressionComparer.cs     |   6 +-
 .../ExpressionTrees/ExpressionEvaluator.cs    |  59 +-
 .../ExpressionTrees/ExpressionHelper.cs       |  12 +-
 .../ExpressionTrees/ExpressionReplacer.cs     |  21 +-
 Signum.Utilities/ExpressionTrees/Query.cs     |   4 +-
 .../ExpressionTrees/QueryProvider.cs          |   4 +-
 .../QueryableAsyncExtensions.cs               |  12 +-
 Signum.Utilities/Extensions/ArgsExtensions.cs |  12 +-
 .../Extensions/ColorExtensions.cs             |  10 +-
 .../Extensions/DateTimeExtensions.cs          |   2 +-
 Signum.Utilities/Extensions/EnumExtensions.cs |   4 +-
 .../Extensions/EnumerableExtensions.cs        |   8 +-
 Signum.Utilities/Extensions/Extensions.cs     |   9 +-
 .../Extensions/GroupExtensions.cs             |  12 +-
 .../Extensions/ReflectionExtensions.cs        |  19 +-
 .../Extensions/RegexExtensions.cs             |  10 +-
 .../Extensions/StringExtensions.cs            |  39 +-
 .../Extensions/StringExtensions.md            |   8 +-
 .../Extensions/TimeSpanExtensions.cs          |   2 +-
 Signum.Utilities/Extensions/TreeHelper.cs     |  24 +-
 Signum.Utilities/NaturalLanguage/German.cs    |  21 +-
 Signum.Utilities/NaturalLanguage/Spanish.cs   |  22 +-
 Signum.Utilities/NotNullAttributes.cs         |  33 +
 Signum.Utilities/ProgressProxy.cs             |   6 +-
 .../Reflection/ReflectionTools.cs             |  17 +-
 .../Reflection/TupleExtensions.cs             |   4 +-
 Signum.Utilities/Statics.cs                   |  17 +-
 .../Synchronization/ThreadSafeEnumerator.cs   |   6 +-
 Signum.Utilities/Tsv.cs                       |   6 +-
 130 files changed, 1751 insertions(+), 1746 deletions(-)
 create mode 100644 Signum.Utilities/NotNullAttributes.cs

diff --git a/Signum.Engine/Basics/ExceptionLogic.cs b/Signum.Engine/Basics/ExceptionLogic.cs
index 6111780b9e..76647c935d 100644
--- a/Signum.Engine/Basics/ExceptionLogic.cs
+++ b/Signum.Engine/Basics/ExceptionLogic.cs
@@ -50,7 +50,7 @@ public static ExceptionEntity LogException(this Exception ex)
 			return entity.SaveForceNew();
 		}
 
-		public static ExceptionEntity GetExceptionEntity(this Exception ex)
+		public static ExceptionEntity? GetExceptionEntity(this Exception ex)
 		{
 			var exEntity = ex.Data[ExceptionEntity.ExceptionDataKey] as ExceptionEntity;
 
diff --git a/Signum.Engine/BulkInserter.cs b/Signum.Engine/BulkInserter.cs
index 493552bc2d..daefa1eef8 100644
--- a/Signum.Engine/BulkInserter.cs
+++ b/Signum.Engine/BulkInserter.cs
@@ -1,375 +1,375 @@
-using Signum.Engine.Maps;
-using Signum.Entities;
-using Signum.Entities.Reflection;
-using Signum.Utilities;
-using Signum.Utilities.ExpressionTrees;
-using Signum.Utilities.Reflection;
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using System.Data;
-using System.Data.SqlClient;
-using System.Linq;
-using System.Linq.Expressions;
-
-namespace Signum.Engine
-{
-    public static class BulkInserter
-    {
-        public static int BulkInsert<T>(this IEnumerable<T> entities,
-            SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
-            bool preSaving = true,
-            bool validateFirst = true,
-            bool disableIdentity = false,
-            int? timeout = null,
-            string? message = null)
-            where T : Entity
-        {
-            using (HeavyProfiler.Log(nameof(BulkInsert), () => typeof(T).TypeName()))
-            using (Transaction tr = new Transaction())
-            {
-
-                var table = Schema.Current.Table(typeof(T));
-
-                if (!disableIdentity && table.IdentityBehaviour && table.TablesMList().Any())
-                    throw new InvalidOperationException($@"Table {typeof(T)} contains MList but the entities have no IDs. Consider:
-* Using BulkInsertQueryIds, that queries the inserted rows and uses the IDs to insert the MList elements.
-* Set {nameof(disableIdentity)} = true, and set manually the Ids of the entities before inseting using {nameof(UnsafeEntityExtensions.SetId)}.
-* If you know what you doing, call ${nameof(BulkInsertTable)} manually (MList wont be saved)."
-    );
-
-                var list = entities.ToList();
-
-                var rowNum = BulkInsertTable(list, copyOptions, preSaving, validateFirst, disableIdentity, timeout, message);
-
-                BulkInsertMLists<T>(list, copyOptions, timeout, message);
-
-                return tr.Commit(rowNum);
-            }
-        }
-
-        /// <param name="keySelector">Unique key to retrieve ids</param>
-        /// <param name="isNewPredicate">Optional filter to query only the recently inseted entities</param>
-        public static int BulkInsertQueryIds<T, K>(this IEnumerable<T> entities,
-            Expression<Func<T, K>> keySelector,
-            Expression<Func<T, bool>>? isNewPredicate = null,
-            SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
-            bool preSaving = true,
-            bool validateFirst = true,
-            int? timeout = null,
-            string? message = null)
+using Signum.Engine.Maps;
+using Signum.Entities;
+using Signum.Entities.Reflection;
+using Signum.Utilities;
+using Signum.Utilities.ExpressionTrees;
+using Signum.Utilities.Reflection;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.SqlClient;
+using System.Linq;
+using System.Linq.Expressions;
+
+namespace Signum.Engine
+{
+    public static class BulkInserter
+    {
+        public static int BulkInsert<T>(this IEnumerable<T> entities,
+            SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
+            bool preSaving = true,
+            bool validateFirst = true,
+            bool disableIdentity = false,
+            int? timeout = null,
+            string? message = null)
             where T : Entity
-            where K : object
-        {
-            using (HeavyProfiler.Log(nameof(BulkInsertQueryIds), () => typeof(T).TypeName()))
-            using (Transaction tr = new Transaction())
-            {
-                var t = Schema.Current.Table(typeof(T));
-
-                var list = entities.ToList();
-
-                if (isNewPredicate == null)
-                    isNewPredicate = GetFilterAutomatic<T>(t);
-
-                var rowNum = BulkInsertTable<T>(list, copyOptions, preSaving, validateFirst, false, timeout, message);
-
-                var dictionary = Database.Query<T>().Where(isNewPredicate).Select(a => KVP.Create(keySelector.Evaluate(a), a.Id)).ToDictionaryEx();
-
-                var getKeyFunc = keySelector.Compile();
-
-                list.ForEach(e =>
-                {
-                    e.SetId(dictionary.GetOrThrow(getKeyFunc(e)));
-                    e.SetIsNew(false);
-                });
-
-                BulkInsertMLists(list, copyOptions, timeout, message);
-
-                GraphExplorer.CleanModifications(GraphExplorer.FromRoots(list));
-
-                return tr.Commit(rowNum);
-            }
-        }
-
-        static void BulkInsertMLists<T>(List<T> list, SqlBulkCopyOptions options, int? timeout, string? message) where T : Entity
-        {
-            var mlistPrs = PropertyRoute.GenerateRoutes(typeof(T), includeIgnored: false).Where(a => a.PropertyRouteType == PropertyRouteType.FieldOrProperty && a.Type.IsMList()).ToList();
-            foreach (var pr in mlistPrs)
-            {
-                giBulkInsertMListFromEntities.GetInvoker(typeof(T), pr.Type.ElementType())(list, pr, options, timeout, message);
-            }
-        }
-
-        static Expression<Func<T, bool>> GetFilterAutomatic<T>(Table table) where T : Entity
-        {
-            if (table.PrimaryKey.Identity)
-            {
-                var max = ExecutionMode.Global().Using(_ => Database.Query<T>().Max(a => (PrimaryKey?)a.Id));
-                if (max == null)
-                    return a => true;
-
-                return a => a.Id > max;
-            }
-
-            var count = ExecutionMode.Global().Using(_ => Database.Query<T>().Count());
-
-            if (count == 0)
-                return a => true;
-
-            throw new InvalidOperationException($"Impossible to determine the filter for the IDs query automatically because the table is not Identity and has rows");
-        }
-
-        public static int BulkInsertTable<T>(IEnumerable<T> entities,
-            SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
-            bool preSaving = true,
-            bool validateFirst = true,
-            bool disableIdentity = false,
-            int? timeout = null,
-            string? message = null)
-            where T : Entity
-        {
-            using (HeavyProfiler.Log(nameof(BulkInsertTable), () => typeof(T).TypeName()))
-            {
-
-                if (message != null)
-                    return SafeConsole.WaitRows(message == "auto" ? $"BulkInsering {entities.Count()} {typeof(T).TypeName()}" : message,
-                        () => BulkInsertTable(entities, copyOptions, preSaving, validateFirst, disableIdentity, timeout, message: null));
-
-                if (disableIdentity)
-                    copyOptions |= SqlBulkCopyOptions.KeepIdentity;
-
-                if (copyOptions.HasFlag(SqlBulkCopyOptions.UseInternalTransaction))
-                    throw new InvalidOperationException("BulkInsertDisableIdentity not compatible with UseInternalTransaction");
-
-                var list = entities.ToList();
-
-                if (preSaving)
-                {
-                    Saver.PreSaving(() => GraphExplorer.FromRoots(list));
-                }
-
-                if (validateFirst)
-                {
-                    Validate<T>(list);
-                }
-
-                var t = Schema.Current.Table<T>();
-                bool disableIdentityBehaviour = copyOptions.HasFlag(SqlBulkCopyOptions.KeepIdentity);
-                bool oldIdentityBehaviour = t.IdentityBehaviour;
-
-                DataTable dt = new DataTable();
-                foreach (var c in t.Columns.Values.Where(c => !(c is SystemVersionedInfo.Column) && (disableIdentityBehaviour || !c.IdentityBehaviour)))
-                    dt.Columns.Add(new DataColumn(c.Name, c.Type.UnNullify()));
-
-                if (disableIdentityBehaviour) t.IdentityBehaviour = false;
-                foreach (var e in list)
-                {
-                    if (!e.IsNew)
-                        throw new InvalidOperationException("Entites should be new");
-                    t.SetToStrField(e);
-                    dt.Rows.Add(t.BulkInsertDataRow(e));
-                }
-                if (disableIdentityBehaviour) t.IdentityBehaviour = oldIdentityBehaviour;
-
-                using (Transaction tr = new Transaction())
-                {
-                    Schema.Current.OnPreBulkInsert(typeof(T), inMListTable: false);
-
-                    Executor.BulkCopy(dt, t.Name, copyOptions, timeout);
-
-                    foreach (var item in list)
-                        item.SetNotModified();
-
-                    return tr.Commit(list.Count);
-                }
-            }
-        }
-
-        static void Validate<T>(IEnumerable<T> entities) where T : Entity
-        {
-            foreach (var e in entities)
-            {
-                var ic = e.FullIntegrityCheck();
-
-                if (ic != null)
-                {
-#if DEBUG
-                    throw new IntegrityCheckException(ic.WithEntities(GraphExplorer.FromRoots(entities)));
-#else
-                    throw new IntegrityCheckException(ic);
-#endif
-                }
-            }
-        }
-
-        static GenericInvoker<Func<IList, PropertyRoute, SqlBulkCopyOptions, int?, string?, int>> giBulkInsertMListFromEntities =
-            new GenericInvoker<Func<IList, PropertyRoute, SqlBulkCopyOptions, int?, string?, int>>((entities, propertyRoute, options, timeout, message) =>
-            BulkInsertMListTablePropertyRoute<Entity, string>((List<Entity>)entities, propertyRoute, options, timeout, message));
-
-        static int BulkInsertMListTablePropertyRoute<E, V>(List<E> entities, PropertyRoute route, SqlBulkCopyOptions copyOptions, int? timeout, string? message)
-             where E : Entity
-        {
-            return BulkInsertMListTable<E, V>(entities, route.GetLambdaExpression<E, MList<V>>(safeNullAccess: false), copyOptions, timeout, message);
-        }
-
-        public static int BulkInsertMListTable<E, V>(
-            List<E> entities,
-            Expression<Func<E, MList<V>>> mListProperty,
-            SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
-            int? timeout = null,
-            string? message = null)
-            where E : Entity
-        {
-            using (HeavyProfiler.Log(nameof(BulkInsertMListTable), () => $"{mListProperty} ({typeof(E).TypeName()})"))
-            {
-                try
-                {
-                    var func = mListProperty.Compile();
-
-                    var mlistElements = (from e in entities
-                                         from mle in func(e).Select((iw, i) => new MListElement<E, V>
-                                         {
-                                             Order = i,
-                                             Element = iw,
-                                             Parent = e,
-                                         })
-                                         select mle).ToList();
-
-                    return BulkInsertMListTable(mlistElements, mListProperty, copyOptions, timeout, updateParentTicks: false, message: message);
-                }
-                catch (InvalidOperationException e) when (e.Message.Contains("has no Id"))
-                {
-                    throw new InvalidOperationException($"{nameof(BulkInsertMListTable)} requires that you set the Id of the entities manually using {nameof(UnsafeEntityExtensions.SetId)}");
-
-                    throw;
-                }
-            }
-        }
-
-        public static int BulkInsertMListTable<E, V>(
-            this IEnumerable<MListElement<E, V>> mlistElements,
-            Expression<Func<E, MList<V>>> mListProperty,
-            SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
-            int? timeout = null,
-            bool? updateParentTicks = null, /*Needed for concurrency and Temporal tables*/
-            string? message = null)
-            where E : Entity
-        {
-            using (HeavyProfiler.Log(nameof(BulkInsertMListTable), () => $"{mListProperty} ({typeof(MListElement<E, V>).TypeName()})"))
-            {
-                if (message != null)
-                    return SafeConsole.WaitRows(message == "auto" ? $"BulkInsering MList<{ typeof(V).TypeName()}> in { typeof(E).TypeName()}" : message,
-                        () => BulkInsertMListTable(mlistElements, mListProperty, copyOptions, timeout, updateParentTicks, message: null));
-
-                if (copyOptions.HasFlag(SqlBulkCopyOptions.UseInternalTransaction))
-                    throw new InvalidOperationException("BulkInsertDisableIdentity not compatible with UseInternalTransaction");
-
-                var mlistTable = ((FieldMList)Schema.Current.Field(mListProperty)).TableMList;
-
-                if (updateParentTicks == null)
-                {
-                    updateParentTicks = mlistTable.PrimaryKey.Type != typeof(Guid) && mlistTable.BackReference.ReferenceTable.Ticks != null;
-                }
-
-                var maxRowId = updateParentTicks.Value ? Database.MListQuery(mListProperty).Max(a => (PrimaryKey?)a.RowId) : null;
-
-                DataTable dt = new DataTable();
-
-                foreach (var c in mlistTable.Columns.Values.Where(c => !(c is SystemVersionedInfo.Column) && !c.IdentityBehaviour))
-                    dt.Columns.Add(new DataColumn(c.Name, c.Type.UnNullify()));
-
-                var list = mlistElements.ToList();
-
-                foreach (var e in list)
-                {
-                    dt.Rows.Add(mlistTable.BulkInsertDataRow(e.Parent, e.Element, e.Order));
-                }
-
-                using (Transaction tr = new Transaction())
-                {
-                    Schema.Current.OnPreBulkInsert(typeof(E), inMListTable: true);
-
-                    Executor.BulkCopy(dt, mlistTable.Name, copyOptions, timeout);
-
-                    var result = list.Count;
-
-                    if (updateParentTicks.Value)
-                    {
-                        Database.MListQuery(mListProperty)
-                            .Where(a => maxRowId == null || a.RowId > maxRowId)
-                            .Select(a => a.Parent)
-                            .UnsafeUpdate()
-                            .Set(e => e.Ticks, a => TimeZoneManager.Now.Ticks)
-                            .Execute();
-                    }
-
-                    return tr.Commit(result);
-                }
-            }
-        }
-
-        public static int BulkInsertView<T>(this IEnumerable<T> entities,
-          SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
-          int? timeout = null,
-          string? message = null)
-          where T : IView
-        {
-            using (HeavyProfiler.Log(nameof(BulkInsertView), () => typeof(T).Name))
-            {
-                if (message != null)
-                    return SafeConsole.WaitRows(message == "auto" ? $"BulkInsering {entities.Count()} {typeof(T).TypeName()}" : message,
-                        () => BulkInsertView(entities, copyOptions, timeout, message: null));
-
-                if (copyOptions.HasFlag(SqlBulkCopyOptions.UseInternalTransaction))
-                    throw new InvalidOperationException("BulkInsertDisableIdentity not compatible with UseInternalTransaction");
-
-                var t = Schema.Current.View<T>();
-
-                var list = entities.ToList();
-
-                bool disableIdentityBehaviour = copyOptions.HasFlag(SqlBulkCopyOptions.KeepIdentity);
-
-                DataTable dt = new DataTable();
-                foreach (var c in t.Columns.Values)
-                    dt.Columns.Add(new DataColumn(c.Name, c.Type.UnNullify()));
-
-                foreach (var e in entities)
-                {
-                    dt.Rows.Add(t.BulkInsertDataRow(e));
-                }
-
-                using (Transaction tr = new Transaction())
-                {
-                    Schema.Current.OnPreBulkInsert(typeof(T), inMListTable: false);
-
-                    Executor.BulkCopy(dt, t.Name, copyOptions, timeout);
-
-                    return tr.Commit(list.Count);
-                }
-            }
-        }
-    }
-
-    public class BulkSetterOptions
-    {
-        public SqlBulkCopyOptions CopyOptions = SqlBulkCopyOptions.Default;
-        public bool ValidateFirst = false;
-        public bool DisableIdentity = false;
-        public int? Timeout = null;
-    }
-
-
-    public class BulkSetterTableOptionsT
-    {
-        public SqlBulkCopyOptions CopyOptions = SqlBulkCopyOptions.Default;
-        public bool ValidateFirst = false;
-        public bool DisableIdentity = false;
-        public int? Timeout = null;
-    }
-
-    public class BulkSetterMListOptions
-    {
-        public SqlBulkCopyOptions CopyOptions = SqlBulkCopyOptions.Default;
-        public int? Timeout = null;
-    }
-}
+        {
+            using (HeavyProfiler.Log(nameof(BulkInsert), () => typeof(T).TypeName()))
+            using (Transaction tr = new Transaction())
+            {
+
+                var table = Schema.Current.Table(typeof(T));
+
+                if (!disableIdentity && table.IdentityBehaviour && table.TablesMList().Any())
+                    throw new InvalidOperationException($@"Table {typeof(T)} contains MList but the entities have no IDs. Consider:
+* Using BulkInsertQueryIds, that queries the inserted rows and uses the IDs to insert the MList elements.
+* Set {nameof(disableIdentity)} = true, and set manually the Ids of the entities before inseting using {nameof(UnsafeEntityExtensions.SetId)}.
+* If you know what you doing, call ${nameof(BulkInsertTable)} manually (MList wont be saved)."
+    );
+
+                var list = entities.ToList();
+
+                var rowNum = BulkInsertTable(list, copyOptions, preSaving, validateFirst, disableIdentity, timeout, message);
+
+                BulkInsertMLists<T>(list, copyOptions, timeout, message);
+
+                return tr.Commit(rowNum);
+            }
+        }
+
+        /// <param name="keySelector">Unique key to retrieve ids</param>
+        /// <param name="isNewPredicate">Optional filter to query only the recently inseted entities</param>
+        public static int BulkInsertQueryIds<T, K>(this IEnumerable<T> entities,
+            Expression<Func<T, K>> keySelector,
+            Expression<Func<T, bool>>? isNewPredicate = null,
+            SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
+            bool preSaving = true,
+            bool validateFirst = true,
+            int? timeout = null,
+            string? message = null)
+            where T : Entity
+            where K : object
+        {
+            using (HeavyProfiler.Log(nameof(BulkInsertQueryIds), () => typeof(T).TypeName()))
+            using (Transaction tr = new Transaction())
+            {
+                var t = Schema.Current.Table(typeof(T));
+
+                var list = entities.ToList();
+
+                if (isNewPredicate == null)
+                    isNewPredicate = GetFilterAutomatic<T>(t);
+
+                var rowNum = BulkInsertTable<T>(list, copyOptions, preSaving, validateFirst, false, timeout, message);
+
+                var dictionary = Database.Query<T>().Where(isNewPredicate).Select(a => KVP.Create(keySelector.Evaluate(a), a.Id)).ToDictionaryEx();
+
+                var getKeyFunc = keySelector.Compile();
+
+                list.ForEach(e =>
+                {
+                    e.SetId(dictionary.GetOrThrow(getKeyFunc(e)));
+                    e.SetIsNew(false);
+                });
+
+                BulkInsertMLists(list, copyOptions, timeout, message);
+
+                GraphExplorer.CleanModifications(GraphExplorer.FromRoots(list));
+
+                return tr.Commit(rowNum);
+            }
+        }
+
+        static void BulkInsertMLists<T>(List<T> list, SqlBulkCopyOptions options, int? timeout, string? message) where T : Entity
+        {
+            var mlistPrs = PropertyRoute.GenerateRoutes(typeof(T), includeIgnored: false).Where(a => a.PropertyRouteType == PropertyRouteType.FieldOrProperty && a.Type.IsMList()).ToList();
+            foreach (var pr in mlistPrs)
+            {
+                giBulkInsertMListFromEntities.GetInvoker(typeof(T), pr.Type.ElementType()!)(list, pr, options, timeout, message);
+            }
+        }
+
+        static Expression<Func<T, bool>> GetFilterAutomatic<T>(Table table) where T : Entity
+        {
+            if (table.PrimaryKey.Identity)
+            {
+                var max = ExecutionMode.Global().Using(_ => Database.Query<T>().Max(a => (PrimaryKey?)a.Id));
+                if (max == null)
+                    return a => true;
+
+                return a => a.Id > max;
+            }
+
+            var count = ExecutionMode.Global().Using(_ => Database.Query<T>().Count());
+
+            if (count == 0)
+                return a => true;
+
+            throw new InvalidOperationException($"Impossible to determine the filter for the IDs query automatically because the table is not Identity and has rows");
+        }
+
+        public static int BulkInsertTable<T>(IEnumerable<T> entities,
+            SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
+            bool preSaving = true,
+            bool validateFirst = true,
+            bool disableIdentity = false,
+            int? timeout = null,
+            string? message = null)
+            where T : Entity
+        {
+            using (HeavyProfiler.Log(nameof(BulkInsertTable), () => typeof(T).TypeName()))
+            {
+
+                if (message != null)
+                    return SafeConsole.WaitRows(message == "auto" ? $"BulkInsering {entities.Count()} {typeof(T).TypeName()}" : message,
+                        () => BulkInsertTable(entities, copyOptions, preSaving, validateFirst, disableIdentity, timeout, message: null));
+
+                if (disableIdentity)
+                    copyOptions |= SqlBulkCopyOptions.KeepIdentity;
+
+                if (copyOptions.HasFlag(SqlBulkCopyOptions.UseInternalTransaction))
+                    throw new InvalidOperationException("BulkInsertDisableIdentity not compatible with UseInternalTransaction");
+
+                var list = entities.ToList();
+
+                if (preSaving)
+                {
+                    Saver.PreSaving(() => GraphExplorer.FromRoots(list));
+                }
+
+                if (validateFirst)
+                {
+                    Validate<T>(list);
+                }
+
+                var t = Schema.Current.Table<T>();
+                bool disableIdentityBehaviour = copyOptions.HasFlag(SqlBulkCopyOptions.KeepIdentity);
+                bool oldIdentityBehaviour = t.IdentityBehaviour;
+
+                DataTable dt = new DataTable();
+                foreach (var c in t.Columns.Values.Where(c => !(c is SystemVersionedInfo.Column) && (disableIdentityBehaviour || !c.IdentityBehaviour)))
+                    dt.Columns.Add(new DataColumn(c.Name, c.Type.UnNullify()));
+
+                if (disableIdentityBehaviour) t.IdentityBehaviour = false;
+                foreach (var e in list)
+                {
+                    if (!e.IsNew)
+                        throw new InvalidOperationException("Entites should be new");
+                    t.SetToStrField(e);
+                    dt.Rows.Add(t.BulkInsertDataRow(e));
+                }
+                if (disableIdentityBehaviour) t.IdentityBehaviour = oldIdentityBehaviour;
+
+                using (Transaction tr = new Transaction())
+                {
+                    Schema.Current.OnPreBulkInsert(typeof(T), inMListTable: false);
+
+                    Executor.BulkCopy(dt, t.Name, copyOptions, timeout);
+
+                    foreach (var item in list)
+                        item.SetNotModified();
+
+                    return tr.Commit(list.Count);
+                }
+            }
+        }
+
+        static void Validate<T>(IEnumerable<T> entities) where T : Entity
+        {
+            foreach (var e in entities)
+            {
+                var ic = e.FullIntegrityCheck();
+
+                if (ic != null)
+                {
+#if DEBUG
+                    throw new IntegrityCheckException(ic.WithEntities(GraphExplorer.FromRoots(entities)));
+#else
+                    throw new IntegrityCheckException(ic);
+#endif
+                }
+            }
+        }
+
+        static readonly GenericInvoker<Func<IList, PropertyRoute, SqlBulkCopyOptions, int?, string?, int>> giBulkInsertMListFromEntities =
+            new GenericInvoker<Func<IList, PropertyRoute, SqlBulkCopyOptions, int?, string?, int>>((entities, propertyRoute, options, timeout, message) =>
+            BulkInsertMListTablePropertyRoute<Entity, string>((List<Entity>)entities, propertyRoute, options, timeout, message));
+
+        static int BulkInsertMListTablePropertyRoute<E, V>(List<E> entities, PropertyRoute route, SqlBulkCopyOptions copyOptions, int? timeout, string? message)
+             where E : Entity
+        {
+            return BulkInsertMListTable<E, V>(entities, route.GetLambdaExpression<E, MList<V>>(safeNullAccess: false), copyOptions, timeout, message);
+        }
+
+        public static int BulkInsertMListTable<E, V>(
+            List<E> entities,
+            Expression<Func<E, MList<V>>> mListProperty,
+            SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
+            int? timeout = null,
+            string? message = null)
+            where E : Entity
+        {
+            using (HeavyProfiler.Log(nameof(BulkInsertMListTable), () => $"{mListProperty} ({typeof(E).TypeName()})"))
+            {
+                try
+                {
+                    var func = mListProperty.Compile();
+
+                    var mlistElements = (from e in entities
+                                         from mle in func(e).Select((iw, i) => new MListElement<E, V>
+                                         {
+                                             Order = i,
+                                             Element = iw,
+                                             Parent = e,
+                                         })
+                                         select mle).ToList();
+
+                    return BulkInsertMListTable(mlistElements, mListProperty, copyOptions, timeout, updateParentTicks: false, message: message);
+                }
+                catch (InvalidOperationException e) when (e.Message.Contains("has no Id"))
+                {
+                    throw new InvalidOperationException($"{nameof(BulkInsertMListTable)} requires that you set the Id of the entities manually using {nameof(UnsafeEntityExtensions.SetId)}");
+
+                    throw;
+                }
+            }
+        }
+
+        public static int BulkInsertMListTable<E, V>(
+            this IEnumerable<MListElement<E, V>> mlistElements,
+            Expression<Func<E, MList<V>>> mListProperty,
+            SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
+            int? timeout = null,
+            bool? updateParentTicks = null, /*Needed for concurrency and Temporal tables*/
+            string? message = null)
+            where E : Entity
+        {
+            using (HeavyProfiler.Log(nameof(BulkInsertMListTable), () => $"{mListProperty} ({typeof(MListElement<E, V>).TypeName()})"))
+            {
+                if (message != null)
+                    return SafeConsole.WaitRows(message == "auto" ? $"BulkInsering MList<{ typeof(V).TypeName()}> in { typeof(E).TypeName()}" : message,
+                        () => BulkInsertMListTable(mlistElements, mListProperty, copyOptions, timeout, updateParentTicks, message: null));
+
+                if (copyOptions.HasFlag(SqlBulkCopyOptions.UseInternalTransaction))
+                    throw new InvalidOperationException("BulkInsertDisableIdentity not compatible with UseInternalTransaction");
+
+                var mlistTable = ((FieldMList)Schema.Current.Field(mListProperty)).TableMList;
+
+                if (updateParentTicks == null)
+                {
+                    updateParentTicks = mlistTable.PrimaryKey.Type != typeof(Guid) && mlistTable.BackReference.ReferenceTable.Ticks != null;
+                }
+
+                var maxRowId = updateParentTicks.Value ? Database.MListQuery(mListProperty).Max(a => (PrimaryKey?)a.RowId) : null;
+
+                DataTable dt = new DataTable();
+
+                foreach (var c in mlistTable.Columns.Values.Where(c => !(c is SystemVersionedInfo.Column) && !c.IdentityBehaviour))
+                    dt.Columns.Add(new DataColumn(c.Name, c.Type.UnNullify()));
+
+                var list = mlistElements.ToList();
+
+                foreach (var e in list)
+                {
+                    dt.Rows.Add(mlistTable.BulkInsertDataRow(e.Parent, e.Element, e.Order));
+                }
+
+                using (Transaction tr = new Transaction())
+                {
+                    Schema.Current.OnPreBulkInsert(typeof(E), inMListTable: true);
+
+                    Executor.BulkCopy(dt, mlistTable.Name, copyOptions, timeout);
+
+                    var result = list.Count;
+
+                    if (updateParentTicks.Value)
+                    {
+                        Database.MListQuery(mListProperty)
+                            .Where(a => maxRowId == null || a.RowId > maxRowId)
+                            .Select(a => a.Parent)
+                            .UnsafeUpdate()
+                            .Set(e => e.Ticks, a => TimeZoneManager.Now.Ticks)
+                            .Execute();
+                    }
+
+                    return tr.Commit(result);
+                }
+            }
+        }
+
+        public static int BulkInsertView<T>(this IEnumerable<T> entities,
+          SqlBulkCopyOptions copyOptions = SqlBulkCopyOptions.Default,
+          int? timeout = null,
+          string? message = null)
+          where T : IView
+        {
+            using (HeavyProfiler.Log(nameof(BulkInsertView), () => typeof(T).Name))
+            {
+                if (message != null)
+                    return SafeConsole.WaitRows(message == "auto" ? $"BulkInsering {entities.Count()} {typeof(T).TypeName()}" : message,
+                        () => BulkInsertView(entities, copyOptions, timeout, message: null));
+
+                if (copyOptions.HasFlag(SqlBulkCopyOptions.UseInternalTransaction))
+                    throw new InvalidOperationException("BulkInsertDisableIdentity not compatible with UseInternalTransaction");
+
+                var t = Schema.Current.View<T>();
+
+                var list = entities.ToList();
+
+                bool disableIdentityBehaviour = copyOptions.HasFlag(SqlBulkCopyOptions.KeepIdentity);
+
+                DataTable dt = new DataTable();
+                foreach (var c in t.Columns.Values)
+                    dt.Columns.Add(new DataColumn(c.Name, c.Type.UnNullify()));
+
+                foreach (var e in entities)
+                {
+                    dt.Rows.Add(t.BulkInsertDataRow(e));
+                }
+
+                using (Transaction tr = new Transaction())
+                {
+                    Schema.Current.OnPreBulkInsert(typeof(T), inMListTable: false);
+
+                    Executor.BulkCopy(dt, t.Name, copyOptions, timeout);
+
+                    return tr.Commit(list.Count);
+                }
+            }
+        }
+    }
+
+    public class BulkSetterOptions
+    {
+        public SqlBulkCopyOptions CopyOptions = SqlBulkCopyOptions.Default;
+        public bool ValidateFirst = false;
+        public bool DisableIdentity = false;
+        public int? Timeout = null;
+    }
+
+
+    public class BulkSetterTableOptionsT
+    {
+        public SqlBulkCopyOptions CopyOptions = SqlBulkCopyOptions.Default;
+        public bool ValidateFirst = false;
+        public bool DisableIdentity = false;
+        public int? Timeout = null;
+    }
+
+    public class BulkSetterMListOptions
+    {
+        public SqlBulkCopyOptions CopyOptions = SqlBulkCopyOptions.Default;
+        public int? Timeout = null;
+    }
+}
diff --git a/Signum.Engine/CodeGeneration/CodeGenerator.cs b/Signum.Engine/CodeGeneration/CodeGenerator.cs
index b5fc250051..c97c2e15cf 100644
--- a/Signum.Engine/CodeGeneration/CodeGenerator.cs
+++ b/Signum.Engine/CodeGeneration/CodeGenerator.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.RegularExpressions;
@@ -63,27 +63,23 @@ public static IEnumerable<Module> GetModules(Dictionary<Type, bool> types, strin
                 if (selected.IsNullOrEmpty())
                     yield break;
 
-                string moduleName = GetDefaultModuleName(selected, solutionName);
+                string? moduleName = GetDefaultModuleName(selected, solutionName);
                 SafeConsole.WriteColor(ConsoleColor.Gray, $"Module name? ([Enter] for '{moduleName}'):");
 
-                moduleName = Console.ReadLine().DefaultText(moduleName);
+                moduleName = Console.ReadLine().DefaultText(moduleName!);
 
-                yield return new Module
-                {
-                    ModuleName = moduleName,
-                    Types = selected.ToList()
-                };
+                yield return new Module(moduleName, selected.ToList());
 
                 types.SetRange(selected, a => a, a => true);
             }
 
         }
 
-        public static string GetDefaultModuleName(Type[] selected, string solutionName)
+        public static string? GetDefaultModuleName(Type[] selected, string solutionName)
         {
             StringDistance sd = new StringDistance();
 
-            string name = null;
+            string? name = null;
             foreach (var item in selected)
             {
                 if (name == null)
@@ -99,7 +95,7 @@ public static string GetDefaultModuleName(Type[] selected, string solutionName)
                 }
             }
 
-            return name.Trim('.');
+            return name?.Trim('.');
         }
     }
 
@@ -107,5 +103,11 @@ public class Module
     {
         public string ModuleName;
         public List<Type> Types;
+
+        public Module(string moduleName, List<Type> types)
+        {
+            ModuleName = moduleName;
+            Types = types;
+        }
     }
 }
diff --git a/Signum.Engine/CodeGeneration/EntityCodeGenerator.cs b/Signum.Engine/CodeGeneration/EntityCodeGenerator.cs
index e913aeb054..c8d9d4b39c 100644
--- a/Signum.Engine/CodeGeneration/EntityCodeGenerator.cs
+++ b/Signum.Engine/CodeGeneration/EntityCodeGenerator.cs
@@ -16,13 +16,13 @@ namespace Signum.Engine.CodeGeneration
 {
     public class EntityCodeGenerator
     {
-        public string SolutionName;
-        public string SolutionFolder;
+        public string SolutionName = null!;
+        public string SolutionFolder = null!;
 
-        public Dictionary<ObjectName, DiffTable> Tables;
-        public DirectedGraph<DiffTable> InverseGraph;
+        public Dictionary<ObjectName, DiffTable> Tables = null!;
+        public DirectedGraph<DiffTable> InverseGraph = null!;
 
-        public Schema CurrentSchema;
+        public Schema CurrentSchema = null!;
 
         public virtual void GenerateEntitiesFromDatabaseTables()
         {
@@ -46,8 +46,7 @@ public virtual void GenerateEntitiesFromDatabaseTables()
 
             foreach (var gr in tables.GroupBy(t => GetFileName(t)))
             {
-                string str = WriteFile(gr.Key, gr);
-
+                string? str = WriteFile(gr.Key, gr);
                 if (str != null)
                 {
                     string fileName = Path.Combine(projectFolder, gr.Key);
@@ -92,7 +91,7 @@ protected virtual string GetFileName(DiffTable t)
             return name + ".cs";
         }
 
-        protected virtual string WriteFile(string fileName, IEnumerable<DiffTable> tables)
+        protected virtual string? WriteFile(string fileName, IEnumerable<DiffTable> tables)
         {
             StringBuilder sb = new StringBuilder();
             foreach (var item in GetUsingNamespaces(fileName, tables))
@@ -164,7 +163,7 @@ protected virtual string GetNamespace(string fileName)
         {
             var result = SolutionName + ".Entities";
 
-            string folder = fileName.TryBeforeLast('\\');
+            string? folder = fileName.TryBeforeLast('\\');
 
             if (folder != null)
                 result += "." + folder.Replace('\\', '.');
@@ -180,7 +179,7 @@ protected virtual void WriteAttributeTag(StringBuilder sb, IEnumerable<string> a
             }
         }
 
-        protected virtual string WriteTableEntity(string fileName, DiffTable table)
+        protected virtual string? WriteTableEntity(string fileName, DiffTable table)
         {
             var mListInfo = GetMListInfo(table);
 
@@ -211,7 +210,7 @@ protected virtual string WriteEntity(string fileName, DiffTable table)
             sb.AppendLine("public class {0} : {1}".FormatWith(name, GetEntityBaseClass(table.Name)));
             sb.AppendLine("{");
 
-            string multiColumnIndexComment = WriteMultiColumnIndexComment(table, name);
+            string? multiColumnIndexComment = WriteMultiColumnIndexComment(table, name);
             if (multiColumnIndexComment != null)
             {
                 sb.Append(multiColumnIndexComment.Indent(4));
@@ -258,7 +257,7 @@ group col by GetEmbeddedField(table, col) into g
                 }
             }
 
-            string toString = WriteToString(table);
+            string? toString = WriteToString(table);
             if (toString != null)
             {
                 sb.Append(toString.Indent(4));
@@ -278,7 +277,7 @@ group col by GetEmbeddedField(table, col) into g
                 }
             }
 
-            string operations = WriteOperations(table);
+            string? operations = WriteOperations(table);
             if (operations != null)
             {
                 sb.Append(operations);
@@ -287,7 +286,7 @@ group col by GetEmbeddedField(table, col) into g
             return sb.ToString();
         }
 
-        protected virtual string GetEmbeddedField(DiffTable table, DiffColumn col)
+        protected virtual string? GetEmbeddedField(DiffTable table, DiffColumn col)
         {
             return null;
         }
@@ -299,7 +298,7 @@ protected virtual string WriteEmbeddedEntity(string fileName, DiffTable table, s
             sb.AppendLine("public class {0} : {1}".FormatWith(name, typeof(EmbeddedEntity).Name));
             sb.AppendLine("{");
 
-            string multiColumnIndexComment = WriteMultiColumnIndexComment(table, name);
+            string? multiColumnIndexComment = WriteMultiColumnIndexComment(table, name);
             if (multiColumnIndexComment != null)
             {
                 sb.Append(multiColumnIndexComment.Indent(4));
@@ -367,13 +366,11 @@ protected virtual List<string> GetEnumAttributes(DiffTable table)
         {
             List<string> atts = new List<string>();
 
-            string tableNameAttribute = GetTableNameAttribute(table.Name, null);
-
+            string? tableNameAttribute = GetTableNameAttribute(table.Name, null);
             if (tableNameAttribute != null)
                 atts.Add(tableNameAttribute);
 
-            string primaryKeyAttribute = GetPrimaryKeyAttribute(table);
-
+            string? primaryKeyAttribute = GetPrimaryKeyAttribute(table);
             if (primaryKeyAttribute != null)
                 atts.Add(primaryKeyAttribute);
 
@@ -400,7 +397,7 @@ protected virtual bool IsEnum(DiffTable objectName)
             return false;
         }
 
-        protected virtual string WriteMultiColumnIndexComment(DiffTable table, string name)
+        protected virtual string? WriteMultiColumnIndexComment(DiffTable table, string name)
         {
             StringBuilder sb = new StringBuilder();
             foreach (var ix in table.Indices.Values.Where(ix => ix.Columns.Count > 1 || ix.FilterDefinition.HasText() || ix.Columns.Any(ic => ic.IsIncluded)))
@@ -413,13 +410,13 @@ protected virtual string WriteMultiColumnIndexComment(DiffTable table, string na
 
                 sb.AppendLine("//Add to Logic class");
                 sb.AppendLine("//sb.AddUniqueIndex<{0}>({1});".FormatWith(name,
-                    new object[] { columns, ix.FilterDefinition, incColumns }.NotNull().ToString(", ")));
+                    new object?[] { columns, ix.FilterDefinition, incColumns }.NotNull().ToString(", ")));
             }
 
-            return sb.ToString().DefaultText(null);
+            return sb.ToString().DefaultText(null!);
         }
 
-        protected virtual string WriteOperations(DiffTable table)
+        protected virtual string? WriteOperations(DiffTable table)
         {
             var kind = GetEntityKind(table);
             if (!(kind == EntityKind.Main || kind == EntityKind.Shared || kind == EntityKind.String))
@@ -439,7 +436,7 @@ protected virtual string GetOperationName(DiffTable objectName)
             return GetEntityName(objectName).RemoveSuffix("Entity") + "Operation";
         }
 
-        protected virtual MListInfo GetMListInfo(DiffTable table)
+        protected virtual MListInfo? GetMListInfo(DiffTable table)
         {
             if (this.InverseGraph.RelatedTo(table).Any())
                 return null;
@@ -458,12 +455,12 @@ protected virtual MListInfo GetMListInfo(DiffTable table)
             };
         }
 
-        protected virtual DiffColumn GetMListTrivialElementColumn(DiffTable table, DiffColumn parentColumn, DiffColumn orderColumn)
+        protected virtual DiffColumn GetMListTrivialElementColumn(DiffTable table, DiffColumn parentColumn, DiffColumn? orderColumn)
         {
             return table.Columns.Values.Where(c => c != parentColumn && c != orderColumn && !c.PrimaryKey).Only();
         }
 
-        protected virtual DiffColumn GetMListOrderColumn(DiffTable table)
+        protected virtual DiffColumn? GetMListOrderColumn(DiffTable table)
         {
             return table.Columns.TryGetC("Order") ?? table.Columns.TryGetC("Row") ?? table.Columns.TryGetC("Index");
         }
@@ -478,15 +475,15 @@ protected virtual IEnumerable<string> GetEntityAttributes(DiffTable table)
 
             atts.Add("EntityKind(EntityKind." + GetEntityKind(table) + ", EntityData." + GetEntityData(table) + ")");
 
-            string tableNameAttribute = GetTableNameAttribute(table.Name, null);
+            string? tableNameAttribute = GetTableNameAttribute(table.Name, null);
             if (tableNameAttribute != null)
                 atts.Add(tableNameAttribute);
 
-            string primaryKeyAttribute = GetPrimaryKeyAttribute(table);
+            string? primaryKeyAttribute = GetPrimaryKeyAttribute(table);
             if (primaryKeyAttribute != null)
                 atts.Add(primaryKeyAttribute);
 
-            string ticksColumnAttribute = GetTicksColumnAttribute(table);
+            string? ticksColumnAttribute = GetTicksColumnAttribute(table);
             if (ticksColumnAttribute != null)
                 atts.Add(ticksColumnAttribute);
 
@@ -499,7 +496,7 @@ protected virtual string GetTicksColumnAttribute(DiffTable table)
         }
 
 
-        protected virtual string GetPrimaryKeyAttribute(DiffTable table)
+        protected virtual string? GetPrimaryKeyAttribute(DiffTable table)
         {
             DiffColumn primaryKey = GetPrimaryKeyColumn(table);
 
@@ -537,7 +534,7 @@ protected virtual DiffColumn GetPrimaryKeyColumn(DiffTable table)
             return table.Columns.Values.SingleOrDefaultEx(a => a.PrimaryKey);
         }
 
-        protected virtual string GetTableNameAttribute(ObjectName objectName, MListInfo mListInfo)
+        protected virtual string? GetTableNameAttribute(ObjectName objectName, MListInfo? mListInfo)
         {
             StringBuilder sb = new StringBuilder();
             sb.Append("TableName(\"" + objectName.Name + "\"");
@@ -583,7 +580,7 @@ protected virtual string GetEntityBaseClass(ObjectName objectName)
 
         protected virtual string WriteField(string fileName, DiffTable table, DiffColumn col)
         {
-            string relatedEntity = GetRelatedEntity(table, col);
+            string? relatedEntity = GetRelatedEntity(table, col);
 
             string type = GetFieldType(table, col, relatedEntity);
 
@@ -598,7 +595,7 @@ protected virtual string WriteField(string fileName, DiffTable table, DiffColumn
             return sb.ToString();
         }
 
-        protected virtual string GetRelatedEntity(DiffTable table, DiffColumn col)
+        protected virtual string? GetRelatedEntity(DiffTable table, DiffColumn col)
         {
             if (col.ForeignKey == null)
                 return null;
@@ -611,21 +608,21 @@ protected virtual bool IsReadonly(DiffTable table, DiffColumn col)
             return false;
         }
 
-        protected virtual IEnumerable<string> GetPropertyAttributes(DiffTable table, DiffColumn col, string relatedEntity)
+        protected virtual IEnumerable<string> GetPropertyAttributes(DiffTable table, DiffColumn col, string? relatedEntity)
         {
             List<string> attributes = new List<string>();
 
             if (RequiresNotNullableAttribute(col, relatedEntity) && GetValueType(col) != typeof(string))
                 attributes.Add("NotNullValidator");
 
-            string stringLengthValidator = GetStringLengthValidator(table, col, relatedEntity);
+            string? stringLengthValidator = GetStringLengthValidator(table, col, relatedEntity);
             if(stringLengthValidator != null)
                 attributes.Add(stringLengthValidator);
 
             return attributes;
         }
 
-        protected virtual string GetStringLengthValidator(DiffTable table, DiffColumn col, string relatedEntity)
+        protected virtual string? GetStringLengthValidator(DiffTable table, DiffColumn col, string? relatedEntity)
         {
             if (GetValueType(col) != typeof(string))
                 return null;
@@ -649,7 +646,7 @@ protected virtual string GetStringLengthValidator(DiffTable table, DiffColumn co
             return 1;
         }
 
-        protected virtual bool RequiresNotNullableAttribute(DiffColumn col, string relatedEntity)
+        protected virtual bool RequiresNotNullableAttribute(DiffColumn col, string? relatedEntity)
         {
             return !col.Nullable && (relatedEntity != null || GetValueType(col).IsClass);
         }
@@ -670,7 +667,7 @@ protected virtual string GetFieldName(DiffTable table, DiffColumn col)
             return name.FirstLower();
         }
 
-        protected virtual IEnumerable<string> GetFieldAttributes(DiffTable table, DiffColumn col, string relatedEntity, bool isMList)
+        protected virtual IEnumerable<string> GetFieldAttributes(DiffTable table, DiffColumn col, string? relatedEntity, bool isMList)
         {
             List<string> attributes = new List<string>();
 
@@ -679,8 +676,7 @@ protected virtual IEnumerable<string> GetFieldAttributes(DiffTable table, DiffCo
 
             if (col.ForeignKey == null)
             {
-                string sqlDbType = GetSqlTypeAttribute(table, col);
-
+                string? sqlDbType = GetSqlTypeAttribute(table, col);
                 if (sqlDbType != null)
                     attributes.Add(sqlDbType);
             }
@@ -723,7 +719,7 @@ protected virtual string DefaultColumnName(DiffTable table, DiffColumn col)
             return fieldName + "ID";
         }
 
-        protected virtual string GetSqlTypeAttribute(DiffTable table, DiffColumn col)
+        protected virtual string? GetSqlTypeAttribute(DiffTable table, DiffColumn col)
         {
             Type type = GetValueType(col);
             List<string> parts = GetSqlDbTypeParts(col, type);
@@ -780,7 +776,7 @@ protected virtual string CleanDefault(string def)
             return def;
         }
 
-        protected virtual string GetFieldType(DiffTable table, DiffColumn col, string relatedEntity)
+        protected virtual string GetFieldType(DiffTable table, DiffColumn col, string? relatedEntity)
         {
             if (relatedEntity != null)
             {
@@ -872,25 +868,25 @@ protected virtual string WriteFieldMList(string fileName, DiffTable table, MList
             }
             else
             {
-                string relatedEntity = GetRelatedEntity(relatedTable, mListInfo.TrivialElementColumn);
+                string relatedEntity = GetRelatedEntity(relatedTable, mListInfo.TrivialElementColumn)!;
                 type = GetFieldType(relatedTable, mListInfo.TrivialElementColumn, relatedEntity);
 
                 fieldAttributes = GetFieldAttributes(relatedTable, mListInfo.TrivialElementColumn, relatedEntity, isMList: true).ToList();
             }
 
-            var preserveOrder = GetPreserveOrderAttribute(mListInfo);
+            string? preserveOrder = GetPreserveOrderAttribute(mListInfo);
             if (preserveOrder != null)
                 fieldAttributes.Add(preserveOrder);
 
-            string primaryKey = GetPrimaryKeyAttribute(relatedTable);
+            string? primaryKey = GetPrimaryKeyAttribute(relatedTable);
             if (primaryKey != null)
                 fieldAttributes.Add(primaryKey);
 
-            string tableName = GetTableNameAttribute(relatedTable.Name, mListInfo);
+            string? tableName = GetTableNameAttribute(relatedTable.Name, mListInfo);
             if (tableName != null)
                 fieldAttributes.Add(tableName);
 
-            string backColumn = GetBackColumnNameAttribute(mListInfo.BackReferenceColumn);
+            string? backColumn = GetBackColumnNameAttribute(mListInfo.BackReferenceColumn);
             if (backColumn != null)
                 fieldAttributes.AddRange(backColumn);
 
@@ -904,7 +900,7 @@ protected virtual string WriteFieldMList(string fileName, DiffTable table, MList
             return sb.ToString();
         }
 
-        protected virtual string GetPreserveOrderAttribute(MListInfo mListInfo)
+        protected virtual string? GetPreserveOrderAttribute(MListInfo mListInfo)
         {
             if(mListInfo.PreserveOrderColumn == null)
                 return null;
@@ -920,7 +916,7 @@ protected virtual string GetPreserveOrderAttribute(MListInfo mListInfo)
             return @"PreserveOrder({0})".FormatWith(parts.ToString(", "));
         }
 
-        protected virtual string GetBackColumnNameAttribute(DiffColumn backReference)
+        protected virtual string? GetBackColumnNameAttribute(DiffColumn backReference)
         {
             if (backReference.Name == "ParentID")
                 return null;
@@ -933,7 +929,7 @@ protected virtual string GetFieldMListName(DiffTable table, DiffTable relatedTab
             return NaturalLanguageTools.Pluralize(relatedTable.Name.Name.RemovePrefix(table.Name.Name));
         }
 
-        protected virtual string WriteToString(DiffTable table)
+        protected virtual string? WriteToString(DiffTable table)
         {
             var toStringColumn = GetToStringColumn(table);
             if (toStringColumn == null)
@@ -972,7 +968,7 @@ public MListInfo(DiffColumn backReferenceColumn)
         }
 
         public readonly DiffColumn BackReferenceColumn;
-        public DiffColumn TrivialElementColumn;
-        public DiffColumn PreserveOrderColumn;
+        public DiffColumn? TrivialElementColumn;
+        public DiffColumn? PreserveOrderColumn;
     }
 }
diff --git a/Signum.Engine/CodeGeneration/LogicCodeGenerator.cs b/Signum.Engine/CodeGeneration/LogicCodeGenerator.cs
index 683d19bab6..b58f51cc8c 100644
--- a/Signum.Engine/CodeGeneration/LogicCodeGenerator.cs
+++ b/Signum.Engine/CodeGeneration/LogicCodeGenerator.cs
@@ -15,10 +15,10 @@ namespace Signum.Engine.CodeGeneration
 {
     public class LogicCodeGenerator
     {
-        public string SolutionName;
-        public string SolutionFolder;
+        public string SolutionName = null!;
+        public string SolutionFolder = null!;
 
-        public Schema CurrentSchema;
+        public Schema CurrentSchema = null!;
 
         protected bool? overwriteFiles = null;
 
@@ -165,7 +165,7 @@ protected virtual string WriteStartMethod(Module mod, List<ExpressionInfo> expre
                     sb.AppendLine();
                 }
 
-                string query = WriteQuery(item);
+                string? query = WriteQuery(item);
                 if (query != null)
                 {
                     sb.Append(query.Indent(8));
@@ -234,7 +234,7 @@ private bool IsSimpleExpression(ExpressionInfo exp, Type type)
             return !exp.IsUnique && type == exp.ToType;
         }
 
-        protected virtual string WriteQuery(Type type)
+        protected virtual string? WriteQuery(Type type)
         {
             if (ShouldWriteSimpleQuery(type))
                 return null;
@@ -276,9 +276,17 @@ protected internal class ExpressionInfo
             public Type FromType;
             public Type ToType;
             public PropertyInfo Property;
-            public string Name;
-            public string ExpressionName;
             public bool IsUnique;
+            public string? Name;
+            public string? ExpressionName;
+
+            public ExpressionInfo(Type fromType, Type toType, PropertyInfo property, bool isUnique)
+            {
+                FromType = fromType;
+                ToType = toType;
+                Property = property;
+                IsUnique = isUnique;
+            }
         }
 
         protected virtual List<ExpressionInfo> GetExpressions(Type toType)
@@ -289,20 +297,14 @@ where fromType.IsEntity() && !fromType.IsAbstract
                           let fi = Reflector.TryFindFieldInfo(toType, pi)
                           where fi != null
                           let isUnique = fi.GetCustomAttribute<UniqueIndexAttribute>() != null
-                          select new ExpressionInfo
-                          {
-                              ToType = toType,
-                              FromType = fromType,
-                              Property = pi,
-                              IsUnique = isUnique,
-                          }).ToList();
+                          select new ExpressionInfo(fromType, toType, pi, isUnique))
+                          .ToList();
 
             foreach (var ei in result)
             {
                 ei.Name = GetExpressionName(ei);
             }
-
-
+            
             result = result.GroupBy(ei => new { ei.FromType, ei.ToType }).Where(g => g.Count() == 1).SelectMany(g => g).ToList();
 
             result = result.Where(ShouldWriteExpression).ToList();
@@ -391,18 +393,18 @@ orderby p.Name.Contains("Name") ? 1 : 2
                     select p).Take(10);
         }
 
-        protected virtual string GetWithVirtualMLists(Type type)
+        protected virtual string? GetWithVirtualMLists(Type type)
         {
             return (from p in Reflector.PublicInstancePropertiesInOrder(type)
                     let bp = GetVirtualMListBackReference(p)
                     where bp != null
-                    select GetWithVirtualMList(type, p, bp)).ToString("\r\n").DefaultText(null);
+                    select GetWithVirtualMList(type, p, bp)).ToString("\r\n").DefaultText(null!);
         }
 
         protected virtual string GetWithVirtualMList(Type type, PropertyInfo p, PropertyInfo bp)
         {
             var p1 = GetVariableName(type);
-            var p2 = GetVariableName(p.PropertyType.ElementType());
+            var p2 = GetVariableName(p.PropertyType.ElementType()!);
             if (p1 == p2)
                 p2 += "2";
 
@@ -411,12 +413,12 @@ protected virtual string GetWithVirtualMList(Type type, PropertyInfo p, Property
             return $"   .WithVirtualMList({p1} => {p1}.{p.Name}, {p2} => {cast}{p2}.{bp.Name})";
         }
 
-        protected virtual PropertyInfo GetVirtualMListBackReference(PropertyInfo pi)
+        protected virtual PropertyInfo? GetVirtualMListBackReference(PropertyInfo pi)
         {
             if (!pi.PropertyType.IsMList())
                 return null;
 
-            if (!pi.PropertyType.ElementType().IsEntity())
+            if (!pi.PropertyType.ElementType()!.IsEntity())
                 return null;
 
             if (!pi.HasAttribute<IgnoreAttribute>())
@@ -445,7 +447,7 @@ protected virtual bool IsVirtualMListBackReference(PropertyInfo pi, Type targetT
 
         protected virtual bool IsSimpleValueType(Type type)
         {
-            var t = CurrentSchema.Settings.GetSqlDbTypePair(type.UnNullify());
+            var t = CurrentSchema.Settings.TryGetSqlDbTypePair(type.UnNullify());
 
             return t != null && t.UserDefinedTypeName == null && t.SqlDbType != SqlDbType.Image && t.SqlDbType != SqlDbType.VarBinary;
         }
@@ -455,7 +457,7 @@ protected virtual string WriteOperations(Type type)
             StringBuilder sb = new StringBuilder();
             foreach (var oper in GetOperationsSymbols(type))
             {
-                string operation = WriteOperation(oper);
+                string? operation = WriteOperation(oper);
                 if (operation != null)
                 {
                     sb.Append(operation);
@@ -465,7 +467,7 @@ protected virtual string WriteOperations(Type type)
             return sb.ToString();
         }
 
-        protected virtual string WriteOperation(IOperationSymbolContainer oper)
+        protected virtual string? WriteOperation(IOperationSymbolContainer oper)
         {
 
             switch (GetOperationType(oper))
@@ -538,7 +540,7 @@ protected virtual bool IsSave(IOperationSymbolContainer oper)
             return oper.ToString().Contains("Save"); ;
         }
 
-        protected virtual string WriteDeleteOperation(IOperationSymbolContainer oper)
+        protected virtual string? WriteDeleteOperation(IOperationSymbolContainer oper)
         {
             if (ShouldWriteSimpleOperations(oper))
                 return null;
diff --git a/Signum.Engine/Connection/Executor.cs b/Signum.Engine/Connection/Executor.cs
index a15d55a3b9..79d19dc694 100644
--- a/Signum.Engine/Connection/Executor.cs
+++ b/Signum.Engine/Connection/Executor.cs
@@ -10,17 +10,16 @@ namespace Signum.Engine
 {
     public static class Executor
     {
-        public static object ExecuteScalar(string sql, List<DbParameter>? parameters = null, CommandType commandType = CommandType.Text)
+        public static object? ExecuteScalar(string sql, List<DbParameter>? parameters = null, CommandType commandType = CommandType.Text)
         {
             return Connector.Current.ExecuteScalar(new SqlPreCommandSimple(sql, parameters), commandType);
         }
 
-        public static object ExecuteScalar(this SqlPreCommandSimple preCommand, CommandType commandType = CommandType.Text)
+        public static object? ExecuteScalar(this SqlPreCommandSimple preCommand, CommandType commandType = CommandType.Text)
         {
             return Connector.Current.ExecuteScalar(preCommand, commandType);
         }
-
-
+        
         public static int ExecuteNonQuery(string sql, List<DbParameter>? parameters = null, CommandType commandType = CommandType.Text)
         {
             return Connector.Current.ExecuteNonQuery(new SqlPreCommandSimple(sql, parameters), commandType);
diff --git a/Signum.Engine/Connection/FieldReader.cs b/Signum.Engine/Connection/FieldReader.cs
index c6598efe38..92b1aeb482 100644
--- a/Signum.Engine/Connection/FieldReader.cs
+++ b/Signum.Engine/Connection/FieldReader.cs
@@ -61,7 +61,7 @@ public bool IsNull(int ordinal)
             return reader.IsDBNull(ordinal);
         }
 
-        public string GetString(int ordinal)
+        public string? GetString(int ordinal)
         {
             LastOrdinal = ordinal;
             if (reader.IsDBNull(ordinal))
@@ -96,7 +96,7 @@ public string GetString(int ordinal)
             }
         }
 
-        public byte[] GetByteArray(int ordinal)
+        public byte[]? GetByteArray(int ordinal)
         {
             LastOrdinal = ordinal;
             if (reader.IsDBNull(ordinal))
@@ -526,7 +526,7 @@ public T GetUdt<T>(int ordinal)
             LastOrdinal = ordinal;
             if (reader.IsDBNull(ordinal))
             {
-                return (T)(object)null;
+                return (T)(object)null!;
             }
 
             var udt = Activator.CreateInstance<T>();
@@ -542,8 +542,7 @@ public T GetUdt<T>(int ordinal)
 
         public static Expression GetExpression(Expression reader, int ordinal, Type type)
         {
-            MethodInfo mi = methods.TryGetC(type);
-
+            MethodInfo? mi = methods.TryGetC(type);
             if (mi != null)
                 return Expression.Call(reader, mi, Expression.Constant(ordinal));
 
@@ -579,7 +578,12 @@ internal FieldReaderException CreateFieldReaderException(Exception ex)
     [Serializable]
     public class FieldReaderException : SqlTypeException
     {
-        public FieldReaderException(Exception inner) : base(null, inner) { }
+        public FieldReaderException(Exception inner, int ordinal, string columnName, Type columnType) : base(null, inner)
+        {
+            this.Ordinal = ordinal;
+            this.ColumnName = columnName;
+            this.ColumnType = columnType;
+        }
         protected FieldReaderException(
           System.Runtime.Serialization.SerializationInfo info,
           System.Runtime.Serialization.StreamingContext context)
@@ -609,7 +613,7 @@ public override string Message
         public string ColumnName { get; internal set; }
         public Type ColumnType { get; internal set; }
         public int Row { get; internal set; }
-        public SqlPreCommand Command { get; internal set; }
-        public LambdaExpression Projector { get; internal set; }
+        public SqlPreCommand? Command { get; internal set; }
+        public LambdaExpression? Projector { get; internal set; }
     }
 }
diff --git a/Signum.Engine/Connection/Transaction.cs b/Signum.Engine/Connection/Transaction.cs
index a7379564f8..7072f7482b 100644
--- a/Signum.Engine/Connection/Transaction.cs
+++ b/Signum.Engine/Connection/Transaction.cs
@@ -17,30 +17,30 @@ namespace Signum.Engine
     /// </summary>
     public class Transaction : IDisposableException
     {
-        static readonly Variable<Dictionary<Connector, ICoreTransaction>> currents = Statics.ThreadVariable<Dictionary<Connector, ICoreTransaction>>("transactions", avoidExportImport: true);
+        static readonly Variable<Dictionary<Connector, ICoreTransaction>?> currents = Statics.ThreadVariable<Dictionary<Connector, ICoreTransaction>?>("transactions", avoidExportImport: true);
 
         bool commited;
         ICoreTransaction coreTransaction;
 
         interface ICoreTransaction
         {
-            event Action<Dictionary<string, object>> PostRealCommit;
+            event Action<Dictionary<string, object>?> PostRealCommit;
             void CallPostRealCommit();
-            event Action<Dictionary<string, object>> PreRealCommit;
-            DbConnection Connection { get; }
-            DbTransaction Transaction { get; }
+            event Action<Dictionary<string, object>?> PreRealCommit;
+            DbConnection? Connection { get; }
+            DbTransaction? Transaction { get; }
 
             bool Started { get; }
 
-            Exception IsRolledback { get; }
+            Exception? IsRolledback { get; }
             void Rollback(Exception ex);
-            event Action<Dictionary<string, object>> Rolledback;
+            event Action<Dictionary<string, object>?> Rolledback;
 
             void Commit();
             void Finish();
             void Start();
 
-            ICoreTransaction Parent { get; }
+            ICoreTransaction? Parent { get; }
 
             Dictionary<string, object> UserData { get; }
         }
@@ -51,27 +51,30 @@ class FakedTransaction : ICoreTransaction
 
             public FakedTransaction(ICoreTransaction parent)
             {
+                if (parent == null)
+                    throw new ArgumentNullException(nameof(parent));
+
                 if (parent != null && parent.IsRolledback != null)
                     throw new InvalidOperationException("The transaction can not be created because a parent transaction is rolled back. Exception:\r\n\t" + parent.IsRolledback.Message, parent.IsRolledback);
 
                 this.parent = parent;
             }
 
-            public event Action<Dictionary<string, object>> PostRealCommit
+            public event Action<Dictionary<string, object>?> PostRealCommit
             {
                 add { parent.PostRealCommit += value; }
                 remove { parent.PostRealCommit -= value; }
             }
 
-            public event Action<Dictionary<string, object>> PreRealCommit
+            public event Action<Dictionary<string, object>?> PreRealCommit
             {
                 add { parent.PreRealCommit += value; }
                 remove { parent.PreRealCommit -= value; }
             }
 
-            public DbConnection Connection { get { return parent.Connection; } }
-            public DbTransaction Transaction { get { return parent.Transaction; } }
-            public Exception IsRolledback { get { return parent.IsRolledback; } }
+            public DbConnection? Connection { get { return parent.Connection; } }
+            public DbTransaction? Transaction { get { return parent.Transaction; } }
+            public Exception? IsRolledback { get { return parent.IsRolledback; } }
             public bool Started { get { return parent.Started; } }
 
             public void Start() { parent.Start(); }
@@ -95,12 +98,12 @@ public void CallPostRealCommit()
 
             }
 
-            public ICoreTransaction Parent
+            public ICoreTransaction? Parent
             {
                 get { return parent; }
             }
 
-            public event Action<Dictionary<string, object>> Rolledback
+            public event Action<Dictionary<string, object>?> Rolledback
             {
                 add { parent.Rolledback += value; }
                 remove { parent.Rolledback -= value; }
@@ -109,19 +112,19 @@ public event Action<Dictionary<string, object>> Rolledback
 
         class RealTransaction : ICoreTransaction
         {
-            ICoreTransaction parent;
+            ICoreTransaction? parent;
 
-            public DbConnection Connection { get; private set; }
-            public DbTransaction Transaction { get; private set; }
-            public Exception IsRolledback { get; private set; }
+            public DbConnection? Connection { get; private set; }
+            public DbTransaction? Transaction { get; private set; }
+            public Exception? IsRolledback { get; private set; }
             public bool Started { get; private set; }
-            public event Action<Dictionary<string, object>> PostRealCommit;
-            public event Action<Dictionary<string, object>> PreRealCommit;
-            public event Action<Dictionary<string, object>> Rolledback;
+            public event Action<Dictionary<string, object>?> PostRealCommit;
+            public event Action<Dictionary<string, object>?> PreRealCommit;
+            public event Action<Dictionary<string, object>?> Rolledback;
 
             IsolationLevel? IsolationLevel;
 
-            public RealTransaction(ICoreTransaction parent, IsolationLevel? isolationLevel)
+            public RealTransaction(ICoreTransaction? parent, IsolationLevel? isolationLevel)
             {
                 IsolationLevel = isolationLevel;
                 this.parent = parent;
@@ -145,7 +148,7 @@ public virtual void Commit()
                 {
                     OnPreRealCommit();
 
-                    Transaction.Commit();
+                    Transaction!.Commit();
                 }
             }
 
@@ -176,7 +179,7 @@ public void Rollback(Exception ex)
             {
                 if (Started && IsRolledback == null)
                 {
-                    Transaction.Rollback();
+                    Transaction!.Rollback();
                     IsRolledback = ex;
                     Rolledback?.Invoke(this.userData);
                 }
@@ -197,13 +200,13 @@ public virtual void Finish()
                 }
             }
 
-            Dictionary<string, object> userData;
+            Dictionary<string, object>? userData;
             public Dictionary<string, object> UserData
             {
                 get { return userData ?? (userData = new Dictionary<string, object>()); }
             }
 
-            public ICoreTransaction Parent
+            public ICoreTransaction? Parent
             {
                 get { return parent; }
             }
@@ -214,19 +217,19 @@ class NamedTransaction : ICoreTransaction
         {
             ICoreTransaction parent;
             string savePointName;
-            public Exception IsRolledback { get; private set; }
+            public Exception? IsRolledback { get; private set; }
             public bool Started { get; private set; }
-            public event Action<Dictionary<string, object>> PostRealCommit;
+            public event Action<Dictionary<string, object>?> PostRealCommit;
 
-            public event Action<Dictionary<string, object>> PreRealCommit;
-            public event Action<Dictionary<string, object>> Rolledback;
+            public event Action<Dictionary<string, object>?> PreRealCommit;
+            public event Action<Dictionary<string, object>?> Rolledback;
 
             public NamedTransaction(ICoreTransaction parent, string savePointName)
             {
                 if (parent == null)
                     throw new InvalidOperationException("Named transactions should be nested inside another transaction");
 
-                if (parent != null && parent.IsRolledback != null)
+                if (parent.IsRolledback != null)
                     throw new InvalidOperationException("The transaction can not be created because a parent transaction is rolled back. Exception:\r\n\t" + parent.IsRolledback.Message, parent.IsRolledback);
 
                 this.parent = parent;
@@ -234,15 +237,15 @@ public NamedTransaction(ICoreTransaction parent, string savePointName)
             }
 
 
-            public DbConnection Connection { get { return parent.Connection; } }
-            public DbTransaction Transaction { get { return parent.Transaction; } }
+            public DbConnection? Connection { get { return parent.Connection; } }
+            public DbTransaction? Transaction { get { return parent.Transaction; } }
 
             public void Start()
             {
                 if (!Started)
                 {
                     parent.Start();
-                    Connector.Current.SaveTransactionPoint(Transaction, savePointName);
+                    Connector.Current.SaveTransactionPoint(Transaction!, savePointName);
                     Started = true;
                 }
             }
@@ -251,7 +254,7 @@ public void Rollback(Exception ex)
             {
                 if (Started && IsRolledback  == null)
                 {
-                    Connector.Current.RollbackTransactionPoint(Transaction, savePointName);
+                    Connector.Current.RollbackTransactionPoint(Transaction!, savePointName);
                     IsRolledback = ex;
                     Rolledback?.Invoke(this.UserData);
                 }
@@ -274,13 +277,13 @@ public void CallPostRealCommit()
 
             public void Finish() { }
 
-            Dictionary<string, object> userData;
+            Dictionary<string, object>? userData;
             public Dictionary<string, object> UserData
             {
                 get { return userData ?? (userData = new Dictionary<string, object>()); }
             }
 
-            public ICoreTransaction Parent
+            public ICoreTransaction? Parent
             {
                 get { return parent; }
             }
@@ -288,17 +291,17 @@ public ICoreTransaction Parent
 
         class NoneTransaction : ICoreTransaction
         {
-            ICoreTransaction parent;
+            ICoreTransaction? parent;
 
-            public DbConnection Connection { get; private set; }
-            public DbTransaction Transaction { get { return null; } }
-            public Exception IsRolledback { get; private set; }
+            public DbConnection? Connection { get; private set; }
+            public DbTransaction? Transaction { get { return null; } }
+            public Exception? IsRolledback { get; private set; }
             public bool Started { get; private set; }
-            public event Action<Dictionary<string, object>> PostRealCommit;
-            public event Action<Dictionary<string, object>> PreRealCommit;
-            public event Action<Dictionary<string, object>> Rolledback;
+            public event Action<Dictionary<string, object>?> PostRealCommit;
+            public event Action<Dictionary<string, object>?> PreRealCommit;
+            public event Action<Dictionary<string, object>?> Rolledback;
 
-            public NoneTransaction(ICoreTransaction parent)
+            public NoneTransaction(ICoreTransaction? parent)
             {
                 this.parent = parent;
             }
@@ -368,13 +371,13 @@ public void Finish()
                 }
             }
 
-            Dictionary<string, object> userData;
+            Dictionary<string, object>? userData;
             public Dictionary<string, object> UserData
             {
                 get { return userData ?? (userData = new Dictionary<string, object>()); }
             }
 
-            public ICoreTransaction Parent
+            public ICoreTransaction? Parent
             {
                 get { return parent; }
             }
@@ -390,7 +393,7 @@ public static bool InTestTransaction
         class TestTransaction : RealTransaction
         {
             bool oldTestTransaction;
-            public TestTransaction(ICoreTransaction parent, IsolationLevel? isolation)
+            public TestTransaction(ICoreTransaction? parent, IsolationLevel? isolation)
                 : base(parent, isolation)
             {
                 oldTestTransaction = inTestTransaction.Value;
@@ -413,19 +416,18 @@ public Transaction()
         {
         }
 
-        Transaction(Func<ICoreTransaction, ICoreTransaction> factory)
+        Transaction(Func<ICoreTransaction?, ICoreTransaction> factory)
         {
-            if (currents.Value == null)
-                currents.Value = new Dictionary<Connector, ICoreTransaction>();
+            var dic = currents.Value ??= new Dictionary<Connector, ICoreTransaction>();
 
             Connector bc = Connector.Current;
 
             if (bc == null)
                 throw new InvalidOperationException("ConnectionScope.Current not established. Use ConnectionScope.Default to set it.");
 
-            ICoreTransaction parent = currents.Value.TryGetC(bc);
+            ICoreTransaction? parent = dic.TryGetC(bc);
 
-            currents.Value[bc] = coreTransaction = factory(parent);
+            dic[bc] = coreTransaction = factory(parent);
         }
 
         public static Transaction None()
@@ -435,7 +437,7 @@ public static Transaction None()
 
         public static Transaction NamedSavePoint(string savePointName)
         {
-            return new Transaction(parent => new NamedTransaction(parent, savePointName));
+            return new Transaction(parent => new NamedTransaction(parent!, savePointName));
         }
 
 
@@ -450,14 +452,14 @@ public static T ForceNew<T>(Func<T> func)
         public static Transaction ForceNew()
         {
             return new Transaction(parent => inTestTransaction.Value ?
-                (ICoreTransaction)new FakedTransaction(parent) :
+                (ICoreTransaction)new FakedTransaction(parent!) :
                 (ICoreTransaction)new RealTransaction(parent, null));
         }
 
         public static Transaction ForceNew(IsolationLevel? isolationLevel)
         {
             return new Transaction(parent => inTestTransaction.Value ?
-                (ICoreTransaction)new FakedTransaction(parent) :
+                (ICoreTransaction)new FakedTransaction(parent!) :
                 (ICoreTransaction)new RealTransaction(parent, isolationLevel));
         }
 
@@ -473,7 +475,7 @@ public static Transaction Test(IsolationLevel? isolationLevel)
 
         static ICoreTransaction GetCurrent()
         {
-            return currents.Value.GetOrThrow(Connector.Current, "No Transaction created yet");
+            return currents.Value!.GetOrThrow(Connector.Current, "No Transaction created yet");
         }
 
         public static event Action<Dictionary<string, object>> PostRealCommit
@@ -506,10 +508,10 @@ public static Dictionary<string, object> TopParentUserData()
 
         public static bool HasTransaction
         {
-            get { return currents.Value != null && currents.Value.ContainsKey(Connector.Current); }
+            get { return currents.Value != null && currents.Value!.ContainsKey(Connector.Current); }
         }
 
-        public static DbConnection CurrentConnection
+        public static DbConnection? CurrentConnection
         {
             get
             {
@@ -519,7 +521,7 @@ public static DbConnection CurrentConnection
             }
         }
 
-        public static DbTransaction CurrentTransaccion
+        public static DbTransaction? CurrentTransaccion
         {
             get
             {
@@ -536,7 +538,7 @@ public static string CurrentStatus()
                 t.Started,
                 t.IsRolledback,
                 t.Connection == null ? "null" : (t.Connection.State.ToString() + " Hash " + t.Connection.GetHashCode()),
-                t.Transaction == null ? "null" : (" Hash " + t.Connection.GetHashCode())), "\r\n");
+                t.Transaction == null ? "null" : (" Hash " + t.Transaction.GetHashCode())), "\r\n");
         }
 
         public T Commit<T>(T returnValue)
@@ -580,14 +582,15 @@ public void Dispose()
             }
             finally
             {
+                var dic = currents.Value!;
                 if (coreTransaction.Parent == null)
                 {
-                    currents.Value.Remove(Connector.Current);
-                    if (currents.Value.Count == 0)
+                    dic.Remove(Connector.Current);
+                    if (dic.Count == 0)
                         currents.Value = null;
                 }
                 else
-                    currents.Value[Connector.Current] = coreTransaction.Parent;
+                    dic[Connector.Current] = coreTransaction.Parent;
             }
 
             if (commited)
@@ -599,7 +602,7 @@ public static void InvokePreRealCommit(Transaction tr)
             ((RealTransaction)tr.coreTransaction).OnPreRealCommit();
         }
 
-        Exception savedException;
+        Exception? savedException;
 
         public void OnException(Exception ex)
         {
diff --git a/Signum.Engine/Database.cs b/Signum.Engine/Database.cs
index 0742be5554..46b0419365 100644
--- a/Signum.Engine/Database.cs
+++ b/Signum.Engine/Database.cs
@@ -116,7 +116,7 @@ public static async Task<T> RetrieveAndForgetAsync<T>(this Lite<T> lite, Cancell
             return (T)(object)await RetrieveAsync(lite.EntityType, lite.Id, token);
         }
 
-        static GenericInvoker<Func<PrimaryKey, Entity>> giRetrieve = new GenericInvoker<Func<PrimaryKey, Entity>>(id => Retrieve<Entity>(id));
+        static readonly GenericInvoker<Func<PrimaryKey, Entity>> giRetrieve = new GenericInvoker<Func<PrimaryKey, Entity>>(id => Retrieve<Entity>(id));
         public static T Retrieve<T>(PrimaryKey id) where T : Entity
         {
             using (HeavyProfiler.Log("DBRetrieve", () => typeof(T).TypeName()))
@@ -164,7 +164,7 @@ public static T Retrieve<T>(PrimaryKey id) where T : Entity
             }
         }
 
-        static GenericInvoker<Func<PrimaryKey, CancellationToken, Task<Entity>>> giRetrieveAsync = new GenericInvoker<Func<PrimaryKey, CancellationToken, Task<Entity>>>((id, token) => RetrieveAsync<Entity>(id, token));
+        static readonly GenericInvoker<Func<PrimaryKey, CancellationToken, Task<Entity>>> giRetrieveAsync = new GenericInvoker<Func<PrimaryKey, CancellationToken, Task<Entity>>>((id, token) => RetrieveAsync<Entity>(id, token));
         public static async Task<T> RetrieveAsync<T>(PrimaryKey id, CancellationToken token) where T : Entity
         {
             using (HeavyProfiler.Log("DBRetrieve", () => typeof(T).TypeName()))
@@ -214,7 +214,7 @@ public static async Task<T> RetrieveAsync<T>(PrimaryKey id, CancellationToken to
 
         static CacheControllerBase<T>? GetCacheController<T>() where T : Entity
         {
-            CacheControllerBase<T> cc = Schema.Current.CacheController<T>();
+            CacheControllerBase<T>? cc = Schema.Current.CacheController<T>();
 
             if (cc == null || !cc.Enabled)
                 return null;
@@ -253,7 +253,7 @@ public static Task<Lite<Entity>> RetrieveLiteAsync(Type type, PrimaryKey id, Can
         }
 
 
-        static GenericInvoker<Func<PrimaryKey, Lite<Entity>>> giRetrieveLite = new GenericInvoker<Func<PrimaryKey, Lite<Entity>>>(id => RetrieveLite<Entity>(id));
+        static readonly GenericInvoker<Func<PrimaryKey, Lite<Entity>>> giRetrieveLite = new GenericInvoker<Func<PrimaryKey, Lite<Entity>>>(id => RetrieveLite<Entity>(id));
         public static Lite<T> RetrieveLite<T>(PrimaryKey id)
             where T : Entity
         {
@@ -283,7 +283,7 @@ public static Lite<T> RetrieveLite<T>(PrimaryKey id)
             }
         }
 
-        static GenericInvoker<Func<PrimaryKey, CancellationToken, Task<Lite<Entity>>>> giRetrieveLiteAsync =
+        static readonly GenericInvoker<Func<PrimaryKey, CancellationToken, Task<Lite<Entity>>>> giRetrieveLiteAsync =
             new GenericInvoker<Func<PrimaryKey, CancellationToken, Task<Lite<Entity>>>>((id, token) => RetrieveLiteAsync<Entity>(id, token));
         public static async Task<Lite<T>> RetrieveLiteAsync<T>(PrimaryKey id, CancellationToken token)
             where T : Entity
@@ -333,7 +333,7 @@ public static async Task<Lite<T>> FillToStringAsync<T>(this Lite<T> lite, Cancel
 
 
         public static string GetToStr(Type type, PrimaryKey id) => giGetToStr.GetInvoker(type)(id);
-        static GenericInvoker<Func<PrimaryKey, string>> giGetToStr = new GenericInvoker<Func<PrimaryKey, string>>(id => GetToStr<Entity>(id));
+        static readonly GenericInvoker<Func<PrimaryKey, string>> giGetToStr = new GenericInvoker<Func<PrimaryKey, string>>(id => GetToStr<Entity>(id));
         public static string GetToStr<T>(PrimaryKey id)
             where T : Entity
         {
@@ -358,7 +358,7 @@ public static string GetToStr<T>(PrimaryKey id)
 
 
         public static Task<string> GetToStrAsync(Type type, PrimaryKey id, CancellationToken token) => giGetToStrAsync.GetInvoker(type)(id, token);
-        static GenericInvoker<Func<PrimaryKey, CancellationToken, Task<string>>> giGetToStrAsync =
+        static readonly GenericInvoker<Func<PrimaryKey, CancellationToken, Task<string>>> giGetToStrAsync =
             new GenericInvoker<Func<PrimaryKey, CancellationToken, Task<string>>>((id, token) => GetToStrAsync<Entity>(id, token));
         public static async Task<string> GetToStrAsync<T>(PrimaryKey id, CancellationToken token)
             where T : Entity
@@ -416,7 +416,7 @@ public static async Task<bool> ExistsAsync<T>(this Lite<T> lite, CancellationTok
         }
 
         public static bool Exists(Type type, PrimaryKey id) => giExist.GetInvoker(type)(id);
-        static GenericInvoker<Func<PrimaryKey, bool>> giExist =
+        static readonly GenericInvoker<Func<PrimaryKey, bool>> giExist =
             new GenericInvoker<Func<PrimaryKey, bool>>(id => Exists<Entity>(id));
         public static bool Exists<T>(PrimaryKey id)
             where T : Entity
@@ -434,7 +434,7 @@ public static bool Exists<T>(PrimaryKey id)
         }
 
         public static Task<bool> ExistsAsync(Type type, PrimaryKey id, CancellationToken token) => giExistAsync.GetInvoker(type)(id, token);
-        static GenericInvoker<Func<PrimaryKey, CancellationToken, Task<bool>>> giExistAsync =
+        static readonly GenericInvoker<Func<PrimaryKey, CancellationToken, Task<bool>>> giExistAsync =
             new GenericInvoker<Func<PrimaryKey, CancellationToken, Task<bool>>>((id, token) => ExistsAsync<Entity>(id, token));
         public static async Task<bool> ExistsAsync<T>(PrimaryKey id, CancellationToken token)
             where T : Entity
@@ -626,7 +626,7 @@ public static async Task<List<Lite<Entity>>> RetrieveAllLiteAsync(Type type, Can
         }
 
 
-        private static GenericInvoker<Func<List<PrimaryKey>, string?, IList>> giRetrieveList =
+        private static readonly GenericInvoker<Func<List<PrimaryKey>, string?, IList>> giRetrieveList =
             new GenericInvoker<Func<List<PrimaryKey>, string?, IList>>((ids, message) => RetrieveList<Entity>(ids, message));
         public static List<T> RetrieveList<T>(List<PrimaryKey> ids, string? message = null)
             where T : Entity
@@ -718,7 +718,7 @@ static List<T> RetrieveFromDatabaseOrCache<T>(List<PrimaryKey> ids, string? mess
             }
         }
 
-        static GenericInvoker<Func<List<PrimaryKey>, CancellationToken, Task<IList>>> giRetrieveListAsync =
+        static readonly GenericInvoker<Func<List<PrimaryKey>, CancellationToken, Task<IList>>> giRetrieveListAsync =
             new GenericInvoker<Func<List<PrimaryKey>, CancellationToken, Task<IList>>>((ids, token) => RetrieveListAsyncIList<Entity>(ids, token));
         static Task<IList> RetrieveListAsyncIList<T>(List<PrimaryKey> ids, CancellationToken token) where T : Entity =>
             RetrieveListAsync<T>(ids, token).ContinueWith(p => (IList)p.Result);
@@ -820,7 +820,7 @@ public static async Task<List<Entity>> RetrieveListAsync(Type type, List<Primary
             return list.Cast<Entity>().ToList();
         }
 
-        static GenericInvoker<Func<List<PrimaryKey>, IList>> giRetrieveListLite =
+        static readonly GenericInvoker<Func<List<PrimaryKey>, IList>> giRetrieveListLite =
             new GenericInvoker<Func<List<PrimaryKey>, IList>>(ids => RetrieveListLite<Entity>(ids));
         public static List<Lite<T>> RetrieveListLite<T>(List<PrimaryKey> ids)
             where T : Entity
@@ -847,7 +847,7 @@ public static List<Lite<T>> RetrieveListLite<T>(List<PrimaryKey> ids)
             }
         }
 
-        static GenericInvoker<Func<List<PrimaryKey>, CancellationToken, Task<IList>>> giRetrieveListLiteAsync =
+        static readonly GenericInvoker<Func<List<PrimaryKey>, CancellationToken, Task<IList>>> giRetrieveListLiteAsync =
             new GenericInvoker<Func<List<PrimaryKey>, CancellationToken, Task<IList>>>((ids, token) => RetrieveListLiteAsyncIList<Entity>(ids, token));
         static Task<IList> RetrieveListLiteAsyncIList<T>(List<PrimaryKey> ids, CancellationToken token)  where T : Entity => RetrieveListLiteAsync<T>(ids, token).ContinueWith(t => (IList)t.Result);
         public static async Task<List<Lite<T>>> RetrieveListLiteAsync<T>(List<PrimaryKey> ids, CancellationToken token)
@@ -978,7 +978,7 @@ public static void Delete<T>(this T ident)
             giDeleteId.GetInvoker(ident.GetType())(ident.Id);
         }
 
-        static GenericInvoker<Action<PrimaryKey>> giDeleteId = new GenericInvoker<Action<PrimaryKey>>(id => Delete<Entity>(id));
+        static readonly GenericInvoker<Action<PrimaryKey>> giDeleteId = new GenericInvoker<Action<PrimaryKey>>(id => Delete<Entity>(id));
         public static void Delete<T>(PrimaryKey id)
             where T : Entity
         {
@@ -1047,7 +1047,7 @@ public static void DeleteList(Type type, IList<PrimaryKey> ids)
             giDeleteList.GetInvoker(type)(ids);
         }
 
-        static GenericInvoker<Action<IList<PrimaryKey>>> giDeleteList = new GenericInvoker<Action<IList<PrimaryKey>>>(l => DeleteList<Entity>(l));
+        static readonly GenericInvoker<Action<IList<PrimaryKey>>> giDeleteList = new GenericInvoker<Action<IList<PrimaryKey>>>(l => DeleteList<Entity>(l));
         public static void DeleteList<T>(IList<PrimaryKey> ids)
             where T : Entity
         {
@@ -1161,7 +1161,7 @@ public static R InDBEntity<E, R>(this E entity, Expression<Func<E, R>> selector)
             return entity.InDB().Select(selector).SingleEx();
         }
 
-        static GenericInvoker<Func<IEntity, IQueryable>> giInDB =
+        static readonly GenericInvoker<Func<IEntity, IQueryable>> giInDB =
             new GenericInvoker<Func<IEntity, IQueryable>>((ie) => InDB<Entity, Entity>((Entity)ie));
         static IQueryable<S> InDB<S, RT>(S entity)
             where S : class, IEntity
@@ -1196,7 +1196,7 @@ public static R InDB<E, R>(this Lite<E> lite, Expression<Func<E, R>> selector) w
             return lite.InDB().Select(selector).SingleEx();
         }
 
-        static GenericInvoker<Func<Lite<IEntity>, IQueryable>> giInDBLite =
+        static readonly GenericInvoker<Func<Lite<IEntity>, IQueryable>> giInDBLite =
             new GenericInvoker<Func<Lite<IEntity>, IQueryable>>(l => InDB<IEntity, Entity>((Lite<Entity>)l));
         static IQueryable<S> InDB<S, RT>(Lite<RT> lite)
             where S : class, IEntity
@@ -1215,8 +1215,8 @@ static IQueryable<S> InDB<S, RT>(Lite<RT> lite)
 
         public class InDbExpander : IMethodExpander
         {
-            static MethodInfo miSelect = ReflectionTools.GetMethodInfo(() => ((IQueryable<int>)null).Select(a => a)).GetGenericMethodDefinition();
-            static MethodInfo miSingleEx = ReflectionTools.GetMethodInfo(() => ((IQueryable<int>)null).SingleEx()).GetGenericMethodDefinition();
+            static readonly MethodInfo miSelect = ReflectionTools.GetMethodInfo(() => ((IQueryable<int>)null).Select(a => a)).GetGenericMethodDefinition();
+            static readonly MethodInfo miSingleEx = ReflectionTools.GetMethodInfo(() => ((IQueryable<int>)null).SingleEx()).GetGenericMethodDefinition();
 
             public Expression Expand(Expression instance, Expression[] arguments, MethodInfo mi)
             {
@@ -1650,9 +1650,9 @@ public interface IUpdateablePart<A, T> : IUpdateable
 
     class UpdateablePart<A, T> : IUpdateablePart<A, T>
     {
-        IQueryable<A> query;
-        Expression<Func<A, T>> partSelector;
-        ReadOnlyCollection<SetterExpressions> settersExpressions;
+        readonly IQueryable<A> query;
+        readonly Expression<Func<A, T>> partSelector;
+        readonly ReadOnlyCollection<SetterExpressions> settersExpressions;
 
         public UpdateablePart(IQueryable<A> query, Expression<Func<A, T>> partSelector, IEnumerable<SetterExpressions>? setters)
         {
@@ -1716,8 +1716,8 @@ public interface IUpdateable<T> : IUpdateable
 
     class Updateable<T> : IUpdateable<T>
     {
-        IQueryable<T> query;
-        ReadOnlyCollection<SetterExpressions> settersExpressions;
+        readonly IQueryable<T> query;
+        readonly ReadOnlyCollection<SetterExpressions> settersExpressions;
 
         public Updateable(IQueryable<T> query, IEnumerable<SetterExpressions>? setters)
         {
diff --git a/Signum.Engine/DynamicQuery/AutoDynamicQuery.cs b/Signum.Engine/DynamicQuery/AutoDynamicQuery.cs
index 8a0775d90c..84a40fdea5 100644
--- a/Signum.Engine/DynamicQuery/AutoDynamicQuery.cs
+++ b/Signum.Engine/DynamicQuery/AutoDynamicQuery.cs
@@ -15,7 +15,7 @@ public class AutoDynamicQueryCore<T> : DynamicQueryCore<T>
     {
         public IQueryable<T> Query { get; private set; }
 
-        Dictionary<string, Meta> metas;
+        readonly Dictionary<string, Meta?> metas;
 
         public AutoDynamicQueryCore(IQueryable<T> query)
         {
@@ -109,7 +109,7 @@ private DQueryable<T> GetDQueryable(QueryRequest request)
             }
         }
 
-        public override object ExecuteQueryValue(QueryValueRequest request)
+        public override object? ExecuteQueryValue(QueryValueRequest request)
         {
             using (SystemTime.Override(request.SystemTime))
             {
@@ -127,7 +127,7 @@ public override object ExecuteQueryValue(QueryValueRequest request)
             }
         }
 
-        public override async Task<object> ExecuteQueryValueAsync(QueryValueRequest request, CancellationToken token)
+        public override async Task<object?> ExecuteQueryValueAsync(QueryValueRequest request, CancellationToken token)
         {
             using (SystemTime.Override(request.SystemTime))
             {
@@ -145,7 +145,7 @@ public override async Task<object> ExecuteQueryValueAsync(QueryValueRequest requ
             }
         }
 
-        public override Lite<Entity> ExecuteUniqueEntity(UniqueEntityRequest request)
+        public override Lite<Entity>? ExecuteUniqueEntity(UniqueEntityRequest request)
         {
             var ex = new _EntityColumn(EntityColumnFactory().BuildColumnDescription(), QueryName);
 
@@ -159,10 +159,10 @@ public override Lite<Entity> ExecuteUniqueEntity(UniqueEntityRequest request)
                 .SelectOne(ex.Token)
                 .Unique(request.UniqueType);
 
-            return (Lite<Entity>)result;
+            return (Lite<Entity>?)result;
         }
 
-        public override async Task<Lite<Entity>> ExecuteUniqueEntityAsync(UniqueEntityRequest request, CancellationToken token)
+        public override async Task<Lite<Entity>?> ExecuteUniqueEntityAsync(UniqueEntityRequest request, CancellationToken token)
         {
             var ex = new _EntityColumn(EntityColumnFactory().BuildColumnDescription(), QueryName);
 
@@ -176,7 +176,7 @@ public override async Task<Lite<Entity>> ExecuteUniqueEntityAsync(UniqueEntityRe
                 .SelectOne(ex.Token)
                 .UniqueAsync(request.UniqueType, token);
 
-            return (Lite<Entity>)result;
+            return (Lite<Entity>?)result;
         }
 
         public override IQueryable<Lite<Entity>> GetEntities(QueryEntitiesRequest request)
@@ -213,7 +213,7 @@ public override DQueryable<object> GetDQueryable(DQueryableRequest request)
             return new DQueryable<object>(query.Query, query.Context);
         }
 
-        public override Expression Expression
+        public override Expression? Expression
         {
             get { return Query.Expression; }
         }
diff --git a/Signum.Engine/DynamicQuery/ColumnDescriptionFactory.cs b/Signum.Engine/DynamicQuery/ColumnDescriptionFactory.cs
index 39b17e532f..ec202cbc01 100644
--- a/Signum.Engine/DynamicQuery/ColumnDescriptionFactory.cs
+++ b/Signum.Engine/DynamicQuery/ColumnDescriptionFactory.cs
@@ -11,7 +11,7 @@ namespace Signum.Engine.DynamicQuery
 {
     public class ColumnDescriptionFactory
     {
-        readonly internal Meta Meta;
+        readonly internal Meta? Meta;
         public Func<string>? OverrideDisplayName { get; set; }
         public Func<string>? OverrideIsAllowed { get; set; }
 
@@ -92,7 +92,7 @@ public PropertyRoute[]? PropertyRoutes
             throw new InvalidOperationException();
         }
 
-        public ColumnDescriptionFactory(int index, MemberInfo mi, Meta meta)
+        public ColumnDescriptionFactory(int index, MemberInfo mi, Meta? meta)
         {
             Name = mi.Name;
 
diff --git a/Signum.Engine/DynamicQuery/DynamicQuery.cs b/Signum.Engine/DynamicQuery/DynamicQuery.cs
index 2bf39da061..0db3f0f21e 100644
--- a/Signum.Engine/DynamicQuery/DynamicQuery.cs
+++ b/Signum.Engine/DynamicQuery/DynamicQuery.cs
@@ -64,7 +64,7 @@ public interface IDynamicQueryCore
     {
         object QueryName { get; set; }
         ColumnDescriptionFactory[] StaticColumns { get; }
-        Expression Expression { get; } //Optional
+        Expression? Expression { get; }
 
         ColumnDescriptionFactory EntityColumnFactory();
         QueryDescription GetQueryDescription();
@@ -73,10 +73,10 @@ public interface IDynamicQueryCore
         Task<ResultTable> ExecuteQueryAsync(QueryRequest request, CancellationToken cancellationToken);
         ResultTable ExecuteQueryGroup(QueryRequest request);
         Task<ResultTable> ExecuteQueryGroupAsync(QueryRequest request, CancellationToken cancellationToken);
-        object ExecuteQueryValue(QueryValueRequest request);
-        Task<object> ExecuteQueryValueAsync(QueryValueRequest request, CancellationToken cancellationToken);
-        Lite<Entity> ExecuteUniqueEntity(UniqueEntityRequest request);
-        Task<Lite<Entity>> ExecuteUniqueEntityAsync(UniqueEntityRequest request, CancellationToken cancellationToken);
+        object? ExecuteQueryValue(QueryValueRequest request);
+        Task<object?> ExecuteQueryValueAsync(QueryValueRequest request, CancellationToken cancellationToken);
+        Lite<Entity>? ExecuteUniqueEntity(UniqueEntityRequest request);
+        Task<Lite<Entity>?> ExecuteUniqueEntityAsync(UniqueEntityRequest request, CancellationToken cancellationToken);
 
         IQueryable<Lite<Entity>> GetEntities(QueryEntitiesRequest request);
         DQueryable<object> GetDQueryable(DQueryableRequest request);
@@ -95,7 +95,7 @@ public static ManualDynamicQueryCore<T> Manual<T>(Func<QueryRequest, QueryDescri
             return new ManualDynamicQueryCore<T>(execute);
         }
 
-        internal static IDynamicQueryCore FromSelectorUntyped<T>(Expression<Func<T, object>> expression)
+        internal static IDynamicQueryCore FromSelectorUntyped<T>(Expression<Func<T, object?>> expression)
             where T : Entity
         {
             var eType = expression.Parameters.SingleEx().Type;
@@ -106,14 +106,14 @@ internal static IDynamicQueryCore FromSelectorUntyped<T>(Expression<Func<T, obje
         }
 
         static readonly GenericInvoker<Func<LambdaExpression, IDynamicQueryCore>> giAutoPrivate =
-            new GenericInvoker<Func<LambdaExpression, IDynamicQueryCore>>(lambda => FromSelector<TypeEntity, object>((Expression<Func<TypeEntity, object>>)lambda));
+            new GenericInvoker<Func<LambdaExpression, IDynamicQueryCore>>(lambda => FromSelector<TypeEntity, object?>((Expression<Func<TypeEntity, object?>>)lambda));
         public static AutoDynamicQueryCore<T> FromSelector<E, T>(Expression<Func<E, T>> selector)
             where E : Entity
         {
             return new AutoDynamicQueryCore<T>(Database.Query<E>().Select(selector));
         }
 
-        public static Dictionary<string, Meta> QueryMetadata(IQueryable query)
+        public static Dictionary<string, Meta?> QueryMetadata(IQueryable query)
         {
             return MetadataVisitor.GatherMetadata(query.Expression);
         }
@@ -122,9 +122,9 @@ public static Dictionary<string, Meta> QueryMetadata(IQueryable query)
 
     public abstract class DynamicQueryCore<T> : IDynamicQueryCore
     {
-        public object QueryName { get; set; }
+        public object QueryName { get; set; } = null!;
 
-        public ColumnDescriptionFactory[] StaticColumns { get; protected set; }
+        public ColumnDescriptionFactory[] StaticColumns { get; protected set; } = null!;
 
         public abstract ResultTable ExecuteQuery(QueryRequest request);
         public abstract Task<ResultTable> ExecuteQueryAsync(QueryRequest request, CancellationToken cancellationToken);
@@ -132,11 +132,11 @@ public abstract class DynamicQueryCore<T> : IDynamicQueryCore
         public abstract ResultTable ExecuteQueryGroup(QueryRequest request);
         public abstract Task<ResultTable> ExecuteQueryGroupAsync(QueryRequest request, CancellationToken cancellationToken);
 
-        public abstract object ExecuteQueryValue(QueryValueRequest request);
-        public abstract Task<object> ExecuteQueryValueAsync(QueryValueRequest request, CancellationToken cancellationToken);
+        public abstract object? ExecuteQueryValue(QueryValueRequest request);
+        public abstract Task<object?> ExecuteQueryValueAsync(QueryValueRequest request, CancellationToken cancellationToken);
 
-        public abstract Lite<Entity> ExecuteUniqueEntity(UniqueEntityRequest request);
-        public abstract Task<Lite<Entity>> ExecuteUniqueEntityAsync(UniqueEntityRequest request, CancellationToken cancellationToken);
+        public abstract Lite<Entity>? ExecuteUniqueEntity(UniqueEntityRequest request);
+        public abstract Task<Lite<Entity>?> ExecuteUniqueEntityAsync(UniqueEntityRequest request, CancellationToken cancellationToken);
 
         public abstract IQueryable<Lite<Entity>> GetEntities(QueryEntitiesRequest request);
         public abstract DQueryable<object> GetDQueryable(DQueryableRequest request);
@@ -179,7 +179,7 @@ public ColumnDescriptionFactory EntityColumnFactory()
             return StaticColumns.Where(c => c.IsEntity).SingleEx(() => "Entity column on {0}".FormatWith(QueryUtils.GetKey(QueryName)));
         }
 
-        public virtual Expression Expression
+        public virtual Expression? Expression
         {
             get { return null; }
         }
@@ -187,7 +187,7 @@ public virtual Expression Expression
         public QueryDescription GetQueryDescription()
         {
             var entity = EntityColumnFactory();
-            string allowed = entity.IsAllowed();
+            string? allowed = entity.IsAllowed();
             if (allowed != null)
                 throw new InvalidOperationException(
                     "Not authorized to see Entity column on {0} because {1}".FormatWith(QueryUtils.GetKey(QueryName), allowed));
@@ -209,11 +209,11 @@ public class DQueryable<T> : IDynamicInfo
     {
         public DQueryable(IQueryable<object> query, BuildExpressionContext context)
         {
-            this.Query= query;
+            this.Query = query;
             this.Context = context;
         }
 
-        public IQueryable<object> Query{ get; private set; }
+        public IQueryable<object> Query { get; private set; }
         public BuildExpressionContext Context { get; private set; }
     }
 
@@ -267,9 +267,9 @@ public static DQueryable<T> ToDQueryable<T>(this IQueryable<T> query, QueryDescr
 
             var dic = description.Columns.ToDictionary(
                 cd => (QueryToken)new ColumnToken(cd, description.QueryName),
-                cd => Expression.PropertyOrField(Expression.Convert(pe, typeof(T)), cd.Name).BuildLiteNulifyUnwrapPrimaryKey(cd.PropertyRoutes));
+                cd => Expression.PropertyOrField(Expression.Convert(pe, typeof(T)), cd.Name).BuildLiteNulifyUnwrapPrimaryKey(cd.PropertyRoutes!));
 
-            return new DQueryable<T>(query.Select(a => (object)a), new BuildExpressionContext(typeof(T), pe, dic));
+            return new DQueryable<T>(query.Select(a => (object)a!), new BuildExpressionContext(typeof(T), pe, dic));
         }
 
 
@@ -287,16 +287,16 @@ public static Task<DEnumerableCount<T>> AllQueryOperationsAsync<T>(this DQueryab
 
         #region Select
 
-        public static IEnumerable<object> SelectOne<T>(this DEnumerable<T> collection, QueryToken token)
+        public static IEnumerable<object?> SelectOne<T>(this DEnumerable<T> collection, QueryToken token)
         {
-            var exp = Expression.Lambda<Func<object, object>>(Expression.Convert(token.BuildExpression(collection.Context), typeof(object)), collection.Context.Parameter);
+            var exp = Expression.Lambda<Func<object, object?>>(Expression.Convert(token.BuildExpression(collection.Context), typeof(object)), collection.Context.Parameter);
 
             return collection.Collection.Select(exp.Compile());
         }
 
-        public static IQueryable<object> SelectOne<T>(this DQueryable<T> query, QueryToken token)
+        public static IQueryable<object?> SelectOne<T>(this DQueryable<T> query, QueryToken token)
         {
-            var exp = Expression.Lambda<Func<object, object>>(Expression.Convert(token.BuildExpression(query.Context), typeof(object)), query.Context.Parameter);
+            var exp = Expression.Lambda<Func<object, object?>>(Expression.Convert(token.BuildExpression(query.Context), typeof(object)), query.Context.Parameter);
 
             return query.Query.Select(exp);
         }
@@ -359,7 +359,7 @@ static Expression<Func<object, object>> TupleConstructor(BuildExpressionContext
 
             newContext =  new BuildExpressionContext(
                     ctor.Type,pe,
-                    tokens.Select((t, i) => new { Token = t, Expr = TupleReflection.TupleChainProperty(Expression.Convert(pe, ctor.Type), i) }).ToDictionary(t => t.Token, t => t.Expr));
+                    tokens.Select((t, i) => new { Token = t, Expr = TupleReflection.TupleChainProperty(Expression.Convert(pe, ctor.Type), i) }).ToDictionary(t => t.Token!, t => t.Expr!)); /*CSBUG*/
 
             return Expression.Lambda<Func<object, object>>(
                     (Expression)Expression.Convert(ctor, typeof(object)), context.Parameter);
@@ -394,11 +394,11 @@ public static DQueryable<T> SelectMany<T>(this DQueryable<T> query, List<Collect
 
         public static DQueryable<T> SelectMany<T>(this DQueryable<T> query, CollectionElementToken cet)
         {
-            Type elementType = cet.Parent.Type.ElementType();
+            Type elementType = cet.Parent!.Type.ElementType()!;
 
             var collectionSelector = Expression.Lambda(typeof(Func<,>).MakeGenericType(typeof(object), typeof(IEnumerable<>).MakeGenericType(elementType)),
                 Expression.Call(miDefaultIfEmptyE.MakeGenericMethod(elementType),
-                    cet.Parent.BuildExpression(query.Context)),
+                    cet.Parent!.BuildExpression(query.Context)),
                 query.Context.Parameter);
 
             var elementParameter = cet.CreateParameter();
@@ -418,7 +418,7 @@ public static DQueryable<T> SelectMany<T>(this DQueryable<T> query, CollectionEl
             {
                 Token = a,
                 Expression = TupleReflection.TupleChainProperty(Expression.Convert(parameter, ctor.Type), i)
-            }).ToDictionary(a => a.Token, a => a.Expression);
+            }).ToDictionary(a => a.Token!, a => a.Expression!); /*CSBUG*/
 
             return new DQueryable<T>(resultQuery,
                 new BuildExpressionContext(ctor.Type, parameter, newReplacements));
@@ -435,8 +435,7 @@ public static DQueryable<T> Where<T>(this DQueryable<T> query, params Filter[] f
 
         public static DQueryable<T> Where<T>(this DQueryable<T> query, List<Filter> filters)
         {
-            Expression<Func<object, bool>> where = GetWhereExpression(query.Context, filters);
-
+            Expression<Func<object, bool>>? where = GetWhereExpression(query.Context, filters);
             if (where == null)
                 return query;
 
@@ -455,20 +454,19 @@ public static DEnumerable<T> Where<T>(this DEnumerable<T> collection, params Fil
 
         public static DEnumerable<T> Where<T>(this DEnumerable<T> collection, List<Filter> filters)
         {
-            Expression<Func<object, bool>> where = GetWhereExpression(collection.Context, filters);
-
+            Expression<Func<object, bool>>? where = GetWhereExpression(collection.Context, filters);
             if (where == null)
                 return collection;
 
             return new DEnumerable<T>(collection.Collection.Where(where.Compile()), collection.Context);
         }
 
-        public static DEnumerable<T> Where<T>(this DEnumerable<T> collection, Func<object, bool> filter)
+        public static DEnumerable<T> Where<T>(this DEnumerable<T> collection, Func<object?, bool> filter)
         {
             return new DEnumerable<T>(collection.Collection.Where(filter).ToList(), collection.Context);
         }
 
-        static Expression<Func<object, bool>> GetWhereExpression(BuildExpressionContext context, List<Filter> filters)
+        static Expression<Func<object, bool>>? GetWhereExpression(BuildExpressionContext context, List<Filter> filters)
         {
             if (filters == null || filters.Count == 0)
                 return null;
@@ -529,20 +527,20 @@ static IOrderedQueryable<object> OrderBy(this IQueryable<object> query, LambdaEx
         {
             MethodInfo mi = (orderType == OrderType.Ascending ? miOrderByQ : miOrderByDescendingQ).MakeGenericMethod(lambda.Type.GetGenericArguments());
 
-            return (IOrderedQueryable<object>)query.Provider.CreateQuery<object>(Expression.Call(null, mi, new Expression[] { query.Expression, Expression.Quote(lambda) }));
+            return (IOrderedQueryable<object>)query.Provider.CreateQuery<object?>(Expression.Call(null, mi, new Expression[] { query.Expression, Expression.Quote(lambda) }));
         }
 
         static IOrderedQueryable<object> ThenBy(this IOrderedQueryable<object> query, LambdaExpression lambda, OrderType orderType)
         {
             MethodInfo mi = (orderType == OrderType.Ascending ? miThenByQ : miThenByDescendingQ).MakeGenericMethod(lambda.Type.GetGenericArguments());
 
-            return (IOrderedQueryable<object>)query.Provider.CreateQuery<object>(Expression.Call(null, mi, new Expression[] { query.Expression, Expression.Quote(lambda) }));
+            return (IOrderedQueryable<object>)query.Provider.CreateQuery<object?>(Expression.Call(null, mi, new Expression[] { query.Expression, Expression.Quote(lambda) }));
         }
 
-        static GenericInvoker<Func<IEnumerable<object>, Delegate, IOrderedEnumerable<object>>> miOrderByE = new GenericInvoker<Func<IEnumerable<object>, Delegate, IOrderedEnumerable<object>>>((col, del) => col.OrderBy((Func<object, object>)del));
-        static GenericInvoker<Func<IOrderedEnumerable<object>, Delegate, IOrderedEnumerable<object>>> miThenByE = new GenericInvoker<Func<IOrderedEnumerable<object>, Delegate, IOrderedEnumerable<object>>>((col, del) => col.ThenBy((Func<object, object>)del));
-        static GenericInvoker<Func<IEnumerable<object>, Delegate, IOrderedEnumerable<object>>> miOrderByDescendingE = new GenericInvoker<Func<IEnumerable<object>, Delegate, IOrderedEnumerable<object>>>((col, del) => col.OrderByDescending((Func<object, object>)del));
-        static GenericInvoker<Func<IOrderedEnumerable<object>, Delegate, IOrderedEnumerable<object>>> miThenByDescendingE = new GenericInvoker<Func<IOrderedEnumerable<object>, Delegate, IOrderedEnumerable<object>>>((col, del) => col.ThenByDescending((Func<object, object>)del));
+        static readonly GenericInvoker<Func<IEnumerable<object>, Delegate, IOrderedEnumerable<object>>> miOrderByE = new GenericInvoker<Func<IEnumerable<object>, Delegate, IOrderedEnumerable<object>>>((col, del) => col.OrderBy((Func<object, object?>)del));
+        static readonly GenericInvoker<Func<IOrderedEnumerable<object>, Delegate, IOrderedEnumerable<object>>> miThenByE = new GenericInvoker<Func<IOrderedEnumerable<object>, Delegate, IOrderedEnumerable<object>>>((col, del) => col.ThenBy((Func<object, object?>)del));
+        static readonly GenericInvoker<Func<IEnumerable<object>, Delegate, IOrderedEnumerable<object>>> miOrderByDescendingE = new GenericInvoker<Func<IEnumerable<object>, Delegate, IOrderedEnumerable<object>>>((col, del) => col.OrderByDescending((Func<object, object?>)del));
+        static readonly GenericInvoker<Func<IOrderedEnumerable<object>, Delegate, IOrderedEnumerable<object>>> miThenByDescendingE = new GenericInvoker<Func<IOrderedEnumerable<object>, Delegate, IOrderedEnumerable<object>>>((col, del) => col.ThenByDescending((Func<object, object?>)del));
 
         public static DEnumerable<T> OrderBy<T>(this DEnumerable<T> collection, List<Order> orders)
         {
@@ -680,7 +678,7 @@ public static async Task<DEnumerableCount<T>> TryPaginateAsync<T>(this DQueryabl
                 return new DEnumerableCount<T>(listTask, query.Context, countTask);
             }
 
-            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination.GetType().Name));
+            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination!.GetType().Name)); /*CSBUG*/
         }
 
         public static DEnumerableCount<T> TryPaginate<T>(this DQueryable<T> query, Pagination pagination)
@@ -715,7 +713,7 @@ public static DEnumerableCount<T> TryPaginate<T>(this DQueryable<T> query, Pagin
                 return new DEnumerableCount<T>(list, query.Context, count);
             }
 
-            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination.GetType().Name));
+            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination!.GetType().Name)); /*CSBUG*/
         }
 
         public static DEnumerableCount<T> TryPaginate<T>(this DEnumerable<T> collection, Pagination pagination)
@@ -753,7 +751,7 @@ public static DEnumerableCount<T> TryPaginate<T>(this DEnumerable<T> collection,
                 return new DEnumerableCount<T>(list, collection.Context, totalElements ?? collection.Collection.Count());
             }
 
-            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination.GetType().Name));
+            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination!.GetType().Name)); /*CSBUG*/
         }
 
         public static DEnumerableCount<T> TryPaginate<T>(this DEnumerableCount<T> collection, Pagination pagination)
@@ -782,14 +780,14 @@ public static DEnumerableCount<T> TryPaginate<T>(this DEnumerableCount<T> collec
                 return new DEnumerableCount<T>(c, collection.Context, collection.TotalElements);
             }
 
-            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination.GetType().Name));
+            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination!.GetType().Name));/*CSBUG*/
         }
 
         #endregion
 
         #region GroupBy
 
-        static GenericInvoker<Func<IEnumerable<object>, Delegate, Delegate, IEnumerable<object>>> giGroupByE =
+        static readonly GenericInvoker<Func<IEnumerable<object>, Delegate, Delegate, IEnumerable<object>>> giGroupByE =
             new GenericInvoker<Func<IEnumerable<object>, Delegate, Delegate, IEnumerable<object>>>(
                 (col, ks, rs) => (IEnumerable<object>)Enumerable.GroupBy<string, int, double>((IEnumerable<string>)col, (Func<string, int>)ks, (Func<int, IEnumerable<string>, double>)rs));
         public static DEnumerable<T> GroupBy<T>(this DEnumerable<T> collection, HashSet<QueryToken> keyTokens, HashSet<AggregateToken> aggregateTokens)
@@ -810,7 +808,7 @@ public static DQueryable<T> GroupBy<T>(this DQueryable<T> query, HashSet<QueryTo
 
             LambdaExpression resultSelector = ResultSelectSelectorAndContext(query.Context, keyTokens, aggregateTokens, keySelector.Body.Type, out BuildExpressionContext newContext);
 
-            var resultQuery = (IQueryable<object>)query.Query.Provider.CreateQuery<object>(Expression.Call(null, miGroupByQ.MakeGenericMethod(typeof(object), keySelector.Body.Type, typeof(object)),
+            var resultQuery = (IQueryable<object>)query.Query.Provider.CreateQuery<object?>(Expression.Call(null, miGroupByQ.MakeGenericMethod(typeof(object), keySelector.Body.Type, typeof(object)),
                 new Expression[] { query.Query.Expression, Expression.Quote(keySelector), Expression.Quote(resultSelector) }));
 
             return new DQueryable<T>(resultQuery, newContext);
@@ -845,13 +843,12 @@ static LambdaExpression KeySelector(BuildExpressionContext context, HashSet<Quer
 
         static Expression BuildAggregateExpressionEnumerable(Expression collection, AggregateToken at, BuildExpressionContext context)
         {
-            Type elementType = collection.Type.ElementType();
+            Type elementType = collection.Type.ElementType()!;
 
             if (at.AggregateFunction == AggregateFunction.Count && at.Parent == null)
                 return Expression.Call(typeof(Enumerable), "Count", new[] { elementType }, new[] { collection });
-
-
-            var body = at.Parent.BuildExpression(context);
+            
+            var body = at.Parent!.BuildExpression(context);
 
             if (at.AggregateFunction == AggregateFunction.Count)
             {
@@ -894,12 +891,12 @@ static Expression BuildAggregateExpressionEnumerable(Expression collection, Aggr
 
         static Expression BuildAggregateExpressionQueryable(Expression collection, AggregateToken at, BuildExpressionContext context)
         {
-            Type elementType = collection.Type.ElementType();
+            Type elementType = collection.Type.ElementType()!;
 
             if (at.AggregateFunction == AggregateFunction.Count)
                 return Expression.Call(typeof(Queryable), "Count", new[] { elementType }, new[] { collection });
 
-            var body = at.Parent.BuildExpression(context);
+            var body = at.Parent!.BuildExpression(context);
 
             var type = at.Type;
 
@@ -919,12 +916,12 @@ static Expression BuildAggregateExpressionQueryableAsync(Expression collection,
         {
             var tokenConstant = Expression.Constant(token);
 
-            Type elementType = collection.Type.ElementType();
+            Type elementType = collection.Type.ElementType()!;
 
             if (at.AggregateFunction == AggregateFunction.Count)
                 return Expression.Call(typeof(QueryableAsyncExtensions), "CountAsync", new[] { elementType }, new[] { collection, tokenConstant });
 
-            var body = at.Parent.BuildExpression(context);
+            var body = at.Parent!.BuildExpression(context);
 
             var type = at.Type;
 
@@ -945,36 +942,36 @@ static Expression BuildAggregateExpressionQueryableAsync(Expression collection,
 
         #region SimpleAggregate
 
-        public static object SimpleAggregate<T>(this DEnumerable<T> collection, AggregateToken simpleAggregate)
+        public static object? SimpleAggregate<T>(this DEnumerable<T> collection, AggregateToken simpleAggregate)
         {
             var expr = BuildAggregateExpressionEnumerable(Expression.Constant(collection.Collection), simpleAggregate, collection.Context);
 
-            return Expression.Lambda<Func<object>>(Expression.Convert(expr, typeof(object))).Compile()();
+            return Expression.Lambda<Func<object?>>(Expression.Convert(expr, typeof(object))).Compile()();
         }
 
-        public static object SimpleAggregate<T>(this DQueryable<T> query, AggregateToken simpleAggregate)
+        public static object? SimpleAggregate<T>(this DQueryable<T> query, AggregateToken simpleAggregate)
         {
             var expr = BuildAggregateExpressionQueryable(query.Query.Expression, simpleAggregate, query.Context);
 
-            return Expression.Lambda<Func<object>>(Expression.Convert(expr, typeof(object))).Compile()();
+            return Expression.Lambda<Func<object?>>(Expression.Convert(expr, typeof(object))).Compile()();
         }
 
-        public static Task<object> SimpleAggregateAsync<T>(this DQueryable<T> query, AggregateToken simpleAggregate, CancellationToken token)
+        public static Task<object?> SimpleAggregateAsync<T>(this DQueryable<T> query, AggregateToken simpleAggregate, CancellationToken token)
         {
             var expr = BuildAggregateExpressionQueryableAsync(query.Query.Expression, simpleAggregate, query.Context, token);
 
-            var func = (Func<object>)Expression.Lambda(expr).Compile();
+            var func = (Func<Task>)Expression.Lambda(expr).Compile();
 
             var task = func();
 
             return giCastObject.GetInvoker(task.GetType().BaseType.GetGenericArguments())(task);
         }
 
-        static GenericInvoker<Func<object, Task<object>>> giCastObject =
-            new GenericInvoker<Func<object, Task<object>>>(task => CastObject<int>((Task<int>)task));
-        static Task<object> CastObject<T>(Task<T> task)
+        static readonly GenericInvoker<Func<Task, Task<object?>>> giCastObject =
+            new GenericInvoker<Func<Task, Task<object?>>>(task => CastObject<int>((Task<int>)task));
+        static Task<object?> CastObject<T>(Task<T> task)
         {
-            return task.ContinueWith(t => (object)t.Result);
+            return task.ContinueWith(t => (object?)t.Result);
         }
 
         #endregion
@@ -1001,7 +998,7 @@ public static ResultTable ToResultTable(object[] result, List<(Column column, La
             return new ResultTable(columnValues, totalElements, pagination);
         }
 
-        static GenericInvoker<Func<object[], Delegate, Array>> miGetValues = new GenericInvoker<Func<object[], Delegate, Array>>((objs, del) => GetValues<int>(objs, (Func<object, int>)del));
+        static readonly GenericInvoker<Func<object[], Delegate, Array>> miGetValues = new GenericInvoker<Func<object[], Delegate, Array>>((objs, del) => GetValues<int>(objs, (Func<object, int>)del));
         static S[] GetValues<S>(object[] collection, Func<object, S> getter)
         {
             S[] array = new S[collection.Length];
diff --git a/Signum.Engine/DynamicQuery/DynamicQueryContainer.cs b/Signum.Engine/DynamicQuery/DynamicQueryContainer.cs
index f8280b055a..7b59b6ff1d 100644
--- a/Signum.Engine/DynamicQuery/DynamicQueryContainer.cs
+++ b/Signum.Engine/DynamicQuery/DynamicQueryContainer.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities;
@@ -29,7 +29,7 @@ public void Register(object queryName, DynamicQueryBucket bucket)
             queries[queryName] = bucket;
         }
 
-        public DynamicQueryBucket TryGetQuery(object queryName)
+        public DynamicQueryBucket? TryGetQuery(object queryName)
         {
             AssertQueryAllowed(queryName, false);
             return queries.TryGetC(queryName);
@@ -58,7 +58,7 @@ static Implementations DefaultImplementations(Type type, object queryName)
             return Implementations.By(property.PropertyType.CleanType());
         }
 
-        T Execute<T>(ExecuteType executeType, object queryName, BaseQueryRequest request, Func<DynamicQueryBucket, T> executor)
+        T Execute<T>(ExecuteType executeType, object queryName, BaseQueryRequest? request, Func<DynamicQueryBucket, T> executor)
         {
             using (ExecutionMode.UserInterface())
             using (HeavyProfiler.Log(executeType.ToString(), () => QueryUtils.GetKey(queryName)))
@@ -102,7 +102,7 @@ async Task<T> ExecuteAsync<T>(ExecuteType executeType, object queryName, BaseQue
             }
         }
 
-        public event Func<ExecuteType, object, BaseQueryRequest, IDisposable> QueryExecuted;
+        public event Func<ExecuteType, object, BaseQueryRequest?, IDisposable> QueryExecuted;
 
         public enum ExecuteType
         {
@@ -131,22 +131,22 @@ public Task<ResultTable> ExecuteQueryAsync(QueryRequest request, CancellationTok
                 return ExecuteAsync(ExecuteType.ExecuteGroupQuery, request.QueryName, request, dqb => dqb.Core.Value.ExecuteQueryGroupAsync(request, token));
         }
 
-        public object ExecuteQueryValue(QueryValueRequest request)
+        public object? ExecuteQueryValue(QueryValueRequest request)
         {
             return Execute(ExecuteType.ExecuteQueryValue, request.QueryName, request, dqb => dqb.Core.Value.ExecuteQueryValue(request));
         }
 
-        public Task<object> ExecuteQueryValueAsync(QueryValueRequest request, CancellationToken token)
+        public Task<object?> ExecuteQueryValueAsync(QueryValueRequest request, CancellationToken token)
         {
             return ExecuteAsync(ExecuteType.ExecuteQueryValue, request.QueryName, request, dqb => dqb.Core.Value.ExecuteQueryValueAsync(request, token));
         }
 
-        public Lite<Entity> ExecuteUniqueEntity(UniqueEntityRequest request)
+        public Lite<Entity>? ExecuteUniqueEntity(UniqueEntityRequest request)
         {
             return Execute(ExecuteType.ExecuteUniqueEntity, request.QueryName, request, dqb => dqb.Core.Value.ExecuteUniqueEntity(request));
         }
 
-        public Task<Lite<Entity>> ExecuteUniqueEntityAsync(UniqueEntityRequest request, CancellationToken token)
+        public Task<Lite<Entity>?> ExecuteUniqueEntityAsync(UniqueEntityRequest request, CancellationToken token)
         {
             return ExecuteAsync(ExecuteType.ExecuteUniqueEntity, request.QueryName, request, dqb => dqb.Core.Value.ExecuteUniqueEntityAsync(request, token));
         }
@@ -212,18 +212,18 @@ public List<object> GetQueryNames()
             return queries.Keys.ToList();
         }
 
-        public Task<object[]> BatchExecute(BaseQueryRequest[] requests, CancellationToken token)
+        public Task<object?[]> BatchExecute(BaseQueryRequest[] requests, CancellationToken token)
         {
-            return Task.WhenAll<object>(requests.Select<BaseQueryRequest, Task<object>>(r =>
+            return Task.WhenAll<object?>(requests.Select<BaseQueryRequest, Task<object?>>(r =>
             {
                 if (r is QueryValueRequest)
                     return ExecuteQueryValueAsync((QueryValueRequest)r, token);
 
                 if (r is QueryRequest)
-                    return ExecuteQueryAsync((QueryRequest)r, token).ContinueWith(a => (object)a.Result);
+                    return ExecuteQueryAsync((QueryRequest)r, token).ContinueWith<object?>(a => a.Result);
 
                 if (r is UniqueEntityRequest)
-                    return ExecuteUniqueEntityAsync((UniqueEntityRequest)r, token).ContinueWith(a => (object)a.Result);
+                    return ExecuteUniqueEntityAsync((UniqueEntityRequest)r, token).ContinueWith(a => (object?)a.Result);
 
                 throw new InvalidOperationException("Unexpected QueryRequest type"); ;
             }));
diff --git a/Signum.Engine/DynamicQuery/DynamicQueryFluentInclude.cs b/Signum.Engine/DynamicQuery/DynamicQueryFluentInclude.cs
index e293b7403f..d0701471cb 100644
--- a/Signum.Engine/DynamicQuery/DynamicQueryFluentInclude.cs
+++ b/Signum.Engine/DynamicQuery/DynamicQueryFluentInclude.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using Signum.Utilities;
 using Signum.Entities;
@@ -10,7 +10,7 @@ namespace Signum.Engine.DynamicQuery
 {
     public static class DynamicQueryFluentInclude
     {
-        public static FluentInclude<T> WithQuery<T>(this FluentInclude<T> fi, Func<Expression<Func<T, object>>> lazyQuerySelector)
+        public static FluentInclude<T> WithQuery<T>(this FluentInclude<T> fi, Func<Expression<Func<T, object?>>> lazyQuerySelector)
             where T : Entity
         {
             QueryLogic.Queries.Register(typeof(T), new DynamicQueryBucket(typeof(T), () => DynamicQueryCore.FromSelectorUntyped(lazyQuerySelector()), Implementations.By(typeof(T))));
diff --git a/Signum.Engine/DynamicQuery/ExpressionContainer.cs b/Signum.Engine/DynamicQuery/ExpressionContainer.cs
index 3f87872350..91dd05e6e9 100644
--- a/Signum.Engine/DynamicQuery/ExpressionContainer.cs
+++ b/Signum.Engine/DynamicQuery/ExpressionContainer.cs
@@ -142,7 +142,7 @@ private Expression<Func<T, IEnumerable<KVP>>> CombineSelectors<T, M, KVP>(Expres
         {
             Expression<Func<T, IEnumerable<KVP>>> result = e => collectionSelector.Evaluate(embeddedSelector.Evaluate(e));
 
-            return (Expression<Func<T, IEnumerable<KVP>>>)ExpressionCleaner.Clean(result);
+            return (Expression<Func<T, IEnumerable<KVP>>>)ExpressionCleaner.Clean(result)!;
         }
 
         private ResetLazy<HashSet<K>> GetAllKeysLazy<T, KVP, K>(Expression<Func<T, IEnumerable<KVP>>> collectionSelector, Expression<Func<KVP, K>> keySelector)
@@ -183,7 +183,7 @@ public class ExtensionDictionaryInfo<T, KVP, K, V> : IExtensionDictionaryInfo
 
         public Expression<Func<KVP, V>> ValueSelector { get; set; }
 
-        ConcurrentDictionary<QueryToken, ExtensionRouteInfo> metas = new ConcurrentDictionary<QueryToken, ExtensionRouteInfo>();
+        readonly ConcurrentDictionary<QueryToken, ExtensionRouteInfo> metas = new ConcurrentDictionary<QueryToken, ExtensionRouteInfo>();
 
         public ExtensionDictionaryInfo(
             Expression<Func<T, IEnumerable<KVP>>> collectionSelector, 
diff --git a/Signum.Engine/DynamicQuery/ManualDynamicQuery.cs b/Signum.Engine/DynamicQuery/ManualDynamicQuery.cs
index 43d1f83f19..7f15801a4a 100644
--- a/Signum.Engine/DynamicQuery/ManualDynamicQuery.cs
+++ b/Signum.Engine/DynamicQuery/ManualDynamicQuery.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Entities.DynamicQuery;
@@ -66,8 +66,8 @@ public override async Task<ResultTable> ExecuteQueryGroupAsync(QueryRequest requ
             return cols.ToResultTable(request);
         }
 
-        public override object ExecuteQueryValue(QueryValueRequest request) => Task.Run(() => ExecuteQueryValueAsync(request, CancellationToken.None));
-        public override async Task<object> ExecuteQueryValueAsync(QueryValueRequest request, CancellationToken cancellationToken)
+        public override object? ExecuteQueryValue(QueryValueRequest request) => Task.Run(() => ExecuteQueryValueAsync(request, CancellationToken.None));
+        public override async Task<object?> ExecuteQueryValueAsync(QueryValueRequest request, CancellationToken cancellationToken)
         {
             var req = new QueryRequest
             {
@@ -88,7 +88,7 @@ public override async Task<object> ExecuteQueryValueAsync(QueryValueRequest requ
 
             else if (request.ValueToken is AggregateToken)
             {
-                var parent = request.ValueToken.Parent;
+                var parent = request.ValueToken.Parent!;
                 req.Columns.Add(new Column(parent, parent.NiceName()));
                 var result = await Execute(req, GetQueryDescription(), cancellationToken);
                 return result.SimpleAggregate((AggregateToken)request.ValueToken);
@@ -103,8 +103,8 @@ public override async Task<object> ExecuteQueryValueAsync(QueryValueRequest requ
 
 
 
-        public override Lite<Entity> ExecuteUniqueEntity(UniqueEntityRequest request) => Task.Run(() => ExecuteUniqueEntityAsync(request, CancellationToken.None)).Result;
-        public override async Task<Lite<Entity>> ExecuteUniqueEntityAsync(UniqueEntityRequest request, CancellationToken cancellationToken)
+        public override Lite<Entity>? ExecuteUniqueEntity(UniqueEntityRequest request) => Task.Run(() => ExecuteUniqueEntityAsync(request, CancellationToken.None)).Result;
+        public override async Task<Lite<Entity>?> ExecuteUniqueEntityAsync(UniqueEntityRequest request, CancellationToken cancellationToken)
         {
             var req = new QueryRequest
             {
diff --git a/Signum.Engine/Engine/Saver.cs b/Signum.Engine/Engine/Saver.cs
index b021504860..f71de66bd7 100644
--- a/Signum.Engine/Engine/Saver.cs
+++ b/Signum.Engine/Engine/Saver.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities;
@@ -116,7 +116,7 @@ private static void SaveGraph(Schema schema, DirectedGraph<Entity> identifiables
             }
         }
 
-        private static void SaveGroup(Schema schema, IGrouping<TypeNew, Entity> group, DirectedGraph<Entity> backEdges)
+        private static void SaveGroup(Schema schema, IGrouping<TypeNew, Entity> group, DirectedGraph<Entity>? backEdges)
         {
             Table table = schema.Table(group.Key.Type);
 
diff --git a/Signum.Engine/Engine/SchemaSynchronizer.cs b/Signum.Engine/Engine/SchemaSynchronizer.cs
index 1c35e66bcc..6d5cf261ba 100644
--- a/Signum.Engine/Engine/SchemaSynchronizer.cs
+++ b/Signum.Engine/Engine/SchemaSynchronizer.cs
@@ -22,7 +22,7 @@ public static class SchemaSynchronizer
             Schema s = Schema.Current;
 
             Dictionary<string, ITable> modelTables = s.GetDatabaseTables().Where(t => !s.IsExternalDatabase(t.Name.Schema.Database)).ToDictionaryEx(a => a.Name.ToString(), "schema tables");
-            var modelTablesHistory = modelTables.Values.Where(a => a.SystemVersioned != null).ToDictionaryEx(a => a.SystemVersioned.TableName.ToString(), "history schema tables");
+            var modelTablesHistory = modelTables.Values.Where(a => a.SystemVersioned != null).ToDictionaryEx(a => a.SystemVersioned!.TableName.ToString(), "history schema tables");
             HashSet<SchemaName> modelSchemas = modelTables.Values.Select(a => a.Name.Schema).Where(a => !SqlBuilder.SystemSchemas.Contains(a.Name)).ToHashSet();
 
             Dictionary<string, DiffTable> databaseTables = DefaultGetDatabaseDescription(s.DatabaseNames());
@@ -296,7 +296,7 @@ from c in t.Columns.Values
                                 (SqlPreCommandSimple)SqlBuilder.AlterTableAddPeriod(tab) : null);
 
                             var addSystemVersioning = (tab.SystemVersioned != null &&
-                                (dif.Period == null || !object.Equals(replacements.Apply(Replacements.KeyTables, dif.TemporalTableName.ToString()), tab.SystemVersioned.TableName.ToString())) ?
+                                (dif.Period == null || !object.Equals(replacements.Apply(Replacements.KeyTables, dif.TemporalTableName!.ToString()), tab.SystemVersioned.TableName.ToString())) ?
                                 SqlBuilder.AlterTableEnableSystemVersioning(tab).Do(a=>a.GoBefore = true) : null);
 
 
@@ -325,7 +325,7 @@ from c in t.Columns.Values
                 SqlPreCommand? historyTables = Synchronizer.SynchronizeScript(Spacing.Double, modelTablesHistory, databaseTablesHistory,
                     createNew: null,
                     removeOld: (tn, dif) => SqlBuilder.DropTable(dif.Name),
-                    mergeBoth: (tn, tab, dif) => !object.Equals(dif.Name, tab.SystemVersioned.TableName) ? SqlBuilder.RenameOrChangeSchema(dif.Name, tab.SystemVersioned.TableName) : null);
+                    mergeBoth: (tn, tab, dif) => !object.Equals(dif.Name, tab.SystemVersioned!.TableName) ? SqlBuilder.RenameOrChangeSchema(dif.Name, tab.SystemVersioned!.TableName) : null);
 
                 SqlPreCommand? syncEnums = SynchronizeEnumsScript(replacements);
 
@@ -399,7 +399,7 @@ from c in t.Columns.Values
                             createNew: (i, mix) => mix is UniqueIndex || mix.Columns.Any(isNew) || SafeConsole.Ask(ref createMissingFreeIndexes, "Create missing non-unique index {0} in {1}?".FormatWith(mix.IndexName, tab.Name)) ? SqlBuilder.CreateIndexBasic(mix, forHistoryTable: true) : null,
                             removeOld: null,
                             mergeBoth: (i, mix, dix) => !dix.IndexEquals(dif, mix) ? SqlBuilder.CreateIndexBasic(mix, forHistoryTable: true) :
-                                mix.IndexName != dix.IndexName ? SqlBuilder.RenameIndex(tab.SystemVersioned.TableName, dix.IndexName, mix.IndexName) : null);
+                                mix.IndexName != dix.IndexName ? SqlBuilder.RenameIndex(tab.SystemVersioned!.TableName, dix.IndexName, mix.IndexName) : null);
 
                         return SqlPreCommand.Combine(Spacing.Simple, controlledIndexes);
                     });
@@ -438,7 +438,7 @@ private static bool DifferentDatabase(ObjectName name, ObjectName name2)
 
         public static Func<SchemaName, bool> IgnoreSchema = s => s.Name.Contains("\\");
 
-        private static HashSet<SchemaName> DefaultGetSchemas(List<DatabaseName> list)
+        private static HashSet<SchemaName> DefaultGetSchemas(List<DatabaseName?> list)
         {
             HashSet<SchemaName> result = new HashSet<SchemaName>();
             foreach (var db in list)
@@ -625,7 +625,7 @@ private static Dictionary<string, DiffIndex> ApplyIndexAutoReplacements(DiffTabl
 
         public static Func<DiffTable, bool> IgnoreTable = null;
 
-        public static Dictionary<string, DiffTable> DefaultGetDatabaseDescription(List<DatabaseName> databases)
+        public static Dictionary<string, DiffTable> DefaultGetDatabaseDescription(List<DatabaseName?> databases)
         {
             List<DiffTable> allTables = new List<DiffTable>();
 
@@ -844,7 +844,7 @@ public static SqlDbType ToSqlDbType(string str)
             }
         }
 
-        private static SqlPreCommand SyncEnums(Schema schema, Table table, Dictionary<string, Entity> current, Dictionary<string, Entity> should)
+        private static SqlPreCommand? SyncEnums(Schema schema, Table table, Dictionary<string, Entity> current, Dictionary<string, Entity> should)
         {
             var deletes = Synchronizer.SynchronizeScript(Spacing.Double, should, current,
                        createNew: null,
@@ -929,6 +929,7 @@ public static SqlPreCommandSimple DisconnectUsers(string databaseName, string va
         }
     }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     public class DiffPeriod
     {
         public string StartColumnName;
@@ -1152,7 +1153,7 @@ public bool DefaultEquals(IColumn other)
             return result;
         }
 
-        private string CleanParenthesis(string p)
+        private string? CleanParenthesis(string? p)
         {
             if (p == null)
                 return null;
@@ -1401,4 +1402,5 @@ public class DiffForeignKeyColumn
         public string Parent;
         public string Referenced;
     }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 }
diff --git a/Signum.Engine/Engine/SqlBuilder.cs b/Signum.Engine/Engine/SqlBuilder.cs
index 20dc172dfa..b126814b58 100644
--- a/Signum.Engine/Engine/SqlBuilder.cs
+++ b/Signum.Engine/Engine/SqlBuilder.cs
@@ -213,7 +213,7 @@ public static string CreateColumn(IColumn c, DefaultConstraint? constraint)
             var defaultConstraint = constraint != null ? $"CONSTRAINT {constraint.Name} DEFAULT " + constraint.QuotedDefinition : null;
             c = c!;/*CSBUG*/
 
-            return $" ".CombineIfNotEmpty(
+            return $" ".Combine(
                 c.Name.SqlEscape(),
                 fullType,
                 c.Identity ? "IDENTITY " : null, 
diff --git a/Signum.Engine/Engine/Sys.Tables.cs b/Signum.Engine/Engine/Sys.Tables.cs
index 8cfaa34128..ac65536c26 100644
--- a/Signum.Engine/Engine/Sys.Tables.cs
+++ b/Signum.Engine/Engine/Sys.Tables.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using System.Linq.Expressions;
 using Signum.Utilities;
@@ -7,6 +7,7 @@
 namespace Signum.Engine.SchemaInfoTables
 {
 #pragma warning disable 649
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
 
     [TableName("sys.objects")]
     public class SysObjects : IView
diff --git a/Signum.Engine/EntityCache.cs b/Signum.Engine/EntityCache.cs
index 084c845901..de11500ce6 100644
--- a/Signum.Engine/EntityCache.cs
+++ b/Signum.Engine/EntityCache.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Entities;
@@ -22,7 +22,7 @@ public void Add(Entity e)
 
                 var tuple = (e.GetType(), e.Id);
 
-                Entity ident = dic.TryGetC(tuple);
+                Entity? ident = dic.TryGetC(tuple);
 
                 if (ident == null)
                     dic.Add(tuple, e);
@@ -38,7 +38,7 @@ public bool Contains(Type type, PrimaryKey id)
                 return dic.ContainsKey((type, id));
             }
 
-            public Entity Get(Type type, PrimaryKey id)
+            public Entity? Get(Type type, PrimaryKey id)
             {
                 return dic.TryGetC((type, id));
             }
@@ -51,7 +51,7 @@ public void AddFullGraph(ModifiableEntity ie)
                     Add(ident);
             }
 
-            IRetriever retriever;
+            IRetriever? retriever;
             public RealEntityCache(bool isSealed)
             {
                 IsSealed = isSealed;
@@ -88,16 +88,13 @@ internal bool TryGetValue((Type type, PrimaryKey id) tuple, out Entity result)
             }
 
             public bool IsSealed { get; private set; }
-            internal Dictionary<string, object> GetRetrieverUserData() => this.retriever.GetUserData();
+            internal Dictionary<string, object>? GetRetrieverUserData() => this.retriever?.GetUserData();
         }
 
 
-        static readonly Variable<RealEntityCache> currentCache = Statics.ThreadVariable<RealEntityCache>("cache");
-
-
-        RealEntityCache oldCache;
-
-        private bool facked = false;
+        static readonly Variable<RealEntityCache?> currentCache = Statics.ThreadVariable<RealEntityCache?>("cache");
+        readonly RealEntityCache? oldCache;
+        readonly bool facked = false;
 
         public EntityCache(EntityCacheType type = EntityCacheType.Normal)
         {
@@ -124,9 +121,9 @@ static RealEntityCache Current
 
         public static bool Created { get { return currentCache.Value != null; } }
 
-        internal static bool HasRetriever { get { return currentCache.Value != null && currentCache.Value.HasRetriever; } }
+        internal static bool HasRetriever { get { return currentCache.Value != null && currentCache.Value!.HasRetriever; } }
 
-        public static bool IsSealed { get { return currentCache.Value.IsSealed; } }
+        public static bool IsSealed { get { return currentCache.Value!.IsSealed; } }
 
         public void Dispose()
         {
@@ -169,17 +166,17 @@ public static bool Contains(Type type, PrimaryKey id)
             return Current.Contains(type, id);
         }
 
-        public static T Get<T>(PrimaryKey id) where T : Entity
+        public static T? Get<T>(PrimaryKey id) where T : Entity
         {
-            return (T)Get(typeof(T), id);
+            return (T?)Get(typeof(T), id);
         }
 
-        public static Entity Get(Type type, PrimaryKey id)
+        public static Entity? Get(Type type, PrimaryKey id)
         {
             return Current.Get(type, id);
         }
 
-        public static Dictionary<string, object> RetrieverUserData()
+        public static Dictionary<string, object>? RetrieverUserData()
         {
             return Current.GetRetrieverUserData();
         }
diff --git a/Signum.Engine/Exceptions.cs b/Signum.Engine/Exceptions.cs
index 314e2d05e7..e44ed23cd6 100644
--- a/Signum.Engine/Exceptions.cs
+++ b/Signum.Engine/Exceptions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.Serialization;
@@ -15,14 +15,14 @@ namespace Signum.Engine
     [Serializable]
     public class UniqueKeyException : ApplicationException
     {
-        public string TableName { get; private set; }
-        public Table Table { get; private set; }
+        public string? TableName { get; private set; }
+        public Table? Table { get; private set; }
 
-        public string IndexName { get; private set; }
-        public UniqueIndex Index { get; private set; }
-        public List<PropertyInfo> Properties { get; private set; }
+        public string? IndexName { get; private set; }
+        public UniqueIndex? Index { get; private set; }
+        public List<PropertyInfo>? Properties { get; private set; }
 
-        public string Values { get; private set; }
+        public string? Values { get; private set; }
 
         protected UniqueKeyException(SerializationInfo info, StreamingContext context) : base(info, context) { }
 
@@ -56,7 +56,7 @@ public UniqueKeyException(Exception inner) : base(null, inner)
 
                             var properties = (from f in tup.Item1.Fields.Values
                                               let cols = f.Field.Columns()
-                                              where cols.Any() && cols.All(index.Columns.Contains)
+                                              where cols.Any() && cols.All(c => index.Columns.Contains(c))
                                               select Reflector.TryFindPropertyInfo(f.FieldInfo)).NotNull().ToList();
 
                             if (properties.IsEmpty())
@@ -90,7 +90,7 @@ public override string Message
                     Table == null ? TableName : Table.Type.NiceName(),
                     Index == null ? IndexName :
                     Properties.IsNullOrEmpty() ? Index.Columns.CommaAnd(c => c.Name) :
-                    Properties.CommaAnd(p=>p.NiceName()),
+                    Properties!.CommaAnd(p => p.NiceName()),
                     Values);
             }
         }
@@ -100,12 +100,12 @@ public override string Message
     [Serializable]
     public class ForeignKeyException : ApplicationException
     {
-        public string TableName { get; private set; }
-        public string Field { get; private set; }
-        public Type TableType { get; private set; }
+        public string? TableName { get; private set; }
+        public string? Field { get; private set; }
+        public Type? TableType { get; private set; }
 
-        public string ReferedTableName { get; private set; }
-        public Type ReferedTableType { get; private set; }
+        public string? ReferedTableName { get; private set; }
+        public Type? ReferedTableType { get; private set; }
 
         public bool IsInsert { get; private set; }
 
@@ -173,7 +173,9 @@ public class EntityNotFoundException : Exception
         public Type Type { get; private set; }
         public PrimaryKey[] Ids { get; private set; }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
         protected EntityNotFoundException(SerializationInfo info, StreamingContext context) : base(info, context) { }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         public EntityNotFoundException(Type type, params PrimaryKey[] ids)
             : base(EngineMessage.EntityWithType0AndId1NotFound.NiceToString().FormatWith(type.Name, ids.ToString(", ")))
@@ -189,7 +191,9 @@ public class ConcurrencyException: Exception
         public Type Type { get; private set; }
         public PrimaryKey[] Ids { get; private set; }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
         protected ConcurrencyException(SerializationInfo info, StreamingContext context) : base(info, context) { }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         public ConcurrencyException(Type type, params PrimaryKey[] ids)
             : base(EngineMessage.ConcurrencyErrorOnDatabaseTable0Id1.NiceToString().FormatWith(type.NiceName(), ids.ToString(", ")))
diff --git a/Signum.Engine/ExecutionContext.cs b/Signum.Engine/ExecutionContext.cs
index f99536a519..bbd1c5dd34 100644
--- a/Signum.Engine/ExecutionContext.cs
+++ b/Signum.Engine/ExecutionContext.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using Signum.Utilities;
 
 namespace Signum.Engine
@@ -38,9 +38,10 @@ public static bool IsCacheDisabled
         }
 
         static readonly ThreadVariable<bool> cacheTempDisabled = Statics.ThreadVariable<bool>("cacheTempDisabled");
-        public static IDisposable DisableCache()
+        public static IDisposable? DisableCache()
         {
-            if (cacheTempDisabled.Value) return null;
+            if (cacheTempDisabled.Value)
+                return null;
             cacheTempDisabled.Value = true;
             return new Disposable(() => cacheTempDisabled.Value = false);
         }
diff --git a/Signum.Engine/Linq/AliasGenerator.cs b/Signum.Engine/Linq/AliasGenerator.cs
index f3214207b0..3dd9bff0ad 100644
--- a/Signum.Engine/Linq/AliasGenerator.cs
+++ b/Signum.Engine/Linq/AliasGenerator.cs
@@ -1,4 +1,4 @@
-using Signum.Engine.Maps;
+using Signum.Engine.Maps;
 using Signum.Utilities;
 using System;
 using System.Collections.Generic;
@@ -8,7 +8,7 @@ namespace Signum.Engine.Linq
 {
     public class AliasGenerator
     {
-        HashSet<string> usedAliases = new HashSet<string>();
+        readonly HashSet<string> usedAliases = new HashSet<string>();
 
         int selectAliasCount = 0;
         public Alias NextSelectAlias()
@@ -43,11 +43,11 @@ public Alias Raw(string name)
 
         public Alias NextTableAlias(string tableName)
         {
-            string abv = tableName.Any(char.IsUpper) ? new string(tableName.Where(c => char.IsUpper(c)).ToArray()) :
+            string? abv = tableName.Any(char.IsUpper) ? new string(tableName.Where(c => char.IsUpper(c)).ToArray()) :
                 tableName.Any(a => a == '_') ? new string(tableName.SplitNoEmpty('_' ).Select(s => s[0]).ToArray()) : null;
 
             if (string.IsNullOrEmpty(abv))
-                abv = tableName.TryStart(3);
+                abv = tableName.TryStart(3)!;
             else
                 abv = abv.ToLower();
 
@@ -68,8 +68,8 @@ public class Alias: IEquatable<Alias>
     {
         public static readonly Alias Unknown = new Alias("Unknown");
 
-        public readonly string Name; //Mutually exclusive
-        public readonly ObjectName ObjectName; //Mutually exclusive
+        public readonly string? Name; //Mutually exclusive
+        public readonly ObjectName? ObjectName; //Mutually exclusive
 
         internal Alias(string name)
         {
@@ -93,12 +93,12 @@ public override bool Equals(object obj)
 
         public override int GetHashCode()
         {
-            return this.Name == null? this.ObjectName.GetHashCode(): this.Name.GetHashCode();
+            return this.Name == null? this.ObjectName!.GetHashCode(): this.Name.GetHashCode();
         }
 
         public override string ToString()
         {
-            return Name?.SqlEscape() ?? ObjectName.ToString();
+            return Name?.SqlEscape() ?? ObjectName!.ToString();
         }
     }
 }
diff --git a/Signum.Engine/Linq/DbExpressions.Signum.cs b/Signum.Engine/Linq/DbExpressions.Signum.cs
index 8325c6749d..74ba5e50f7 100644
--- a/Signum.Engine/Linq/DbExpressions.Signum.cs
+++ b/Signum.Engine/Linq/DbExpressions.Signum.cs
@@ -336,10 +336,10 @@ internal class LiteValueExpression : DbExpression
     {
         public readonly Expression TypeId;
         public readonly Expression Id;
-        public readonly Expression ToStr; //Not readonly
+        public readonly Expression? ToStr;
 
 
-        public LiteValueExpression(Type type, Expression typeId, Expression id, Expression toStr) :
+        public LiteValueExpression(Type type, Expression typeId, Expression id, Expression? toStr) :
             base(DbExpressionType.LiteValue, type)
         {
             this.TypeId = typeId ?? throw new ArgumentNullException(nameof(typeId));
@@ -430,9 +430,9 @@ internal class MListExpression : DbExpression
     {
         public readonly PrimaryKeyExpression BackID; // not readonly
         public readonly TableMList TableMList;
-        public readonly NewExpression ExternalPeriod;
+        public readonly NewExpression? ExternalPeriod;
 
-        public MListExpression(Type type, PrimaryKeyExpression backID, NewExpression externalPeriod, TableMList tr)
+        public MListExpression(Type type, PrimaryKeyExpression backID, NewExpression? externalPeriod, TableMList tr)
             : base(DbExpressionType.MList, type)
         {
             this.BackID = backID;
@@ -483,7 +483,7 @@ internal class MListProjectionExpression : DbExpression
         public MListProjectionExpression(Type type, ProjectionExpression projection)
             : base(DbExpressionType.MListProjection, type)
         {
-            if (!projection.Type.ElementType().IsInstantiationOf(typeof(MList<>.RowIdElement)))
+            if (!projection.Type.ElementType()!.IsInstantiationOf(typeof(MList<>.RowIdElement)))
                 throw new ArgumentException("projector should be collation of RowIdValue");
 
             this.Projection = projection;
@@ -504,16 +504,16 @@ internal class MListElementExpression : DbExpression
     {
         public readonly PrimaryKeyExpression RowId;
         public readonly EntityExpression Parent;
-        public readonly Expression Order;
+        public readonly Expression? Order;
         public readonly Expression Element;
 
         public readonly TableMList Table;
 
         public readonly Alias Alias;
 
-        public readonly NewExpression TablePeriod;
+        public readonly NewExpression? TablePeriod;
 
-        public MListElementExpression(PrimaryKeyExpression rowId, EntityExpression parent, Expression order, Expression element, NewExpression systemPeriod, TableMList table, Alias alias)
+        public MListElementExpression(PrimaryKeyExpression rowId, EntityExpression parent, Expression? order, Expression element, NewExpression? systemPeriod, TableMList table, Alias alias)
             : base(DbExpressionType.MListElement, typeof(MListElement<,>).MakeGenericType(parent.Type, element.Type))
         {
             this.RowId = rowId;
@@ -530,7 +530,7 @@ public override string ToString()
             return "MListElement({0})\r\n{{\r\nParent={1},\r\nOrder={2},\r\nElement={3}}})".FormatWith(
                 RowId.ToString(),
                 Parent.ToString(),
-                Order == null ? Order.ToString() : null,
+                Order?.ToString(),
                 Element.ToString());
         }
 
diff --git a/Signum.Engine/Linq/DbExpressions.Sql.cs b/Signum.Engine/Linq/DbExpressions.Sql.cs
index bddce390db..89d1221e24 100644
--- a/Signum.Engine/Linq/DbExpressions.Sql.cs
+++ b/Signum.Engine/Linq/DbExpressions.Sql.cs
@@ -1084,7 +1084,7 @@ protected override Expression Accept(DbExpressionVisitor visitor)
 
     internal class RowNumberExpression : DbExpression
     {
-        public readonly ReadOnlyCollection<OrderExpression>? OrderBy;
+        public readonly ReadOnlyCollection<OrderExpression> OrderBy;
 
         public RowNumberExpression(IEnumerable<OrderExpression>? orderBy)
             : base(DbExpressionType.RowNumber, typeof(int))
@@ -1127,7 +1127,7 @@ internal ProjectionExpression(SelectExpression select, Expression projector, Uni
             if (projector == null)
                 throw new ArgumentNullException(nameof(projector));
 
-            var elementType = uniqueFunction == null ? resultType.ElementType() : resultType;
+            var elementType = uniqueFunction == null ? resultType.ElementType()! : resultType;
             if (!elementType.IsAssignableFrom(projector.Type))
                 throw new InvalidOperationException("Projector ({0}) does not fit in the projection ({1})".FormatWith(
                     projector.Type.TypeName(),
@@ -1191,9 +1191,9 @@ internal class DeleteExpression : CommandExpression
         public ObjectName Name { get { return UseHistoryTable ? Table.SystemVersioned!.TableName : Table.Name; } }
 
         public readonly SourceWithAliasExpression Source;
-        public readonly Expression Where;
+        public readonly Expression? Where;
 
-        public DeleteExpression(ITable table, bool useHistoryTable, SourceWithAliasExpression source, Expression where)
+        public DeleteExpression(ITable table, bool useHistoryTable, SourceWithAliasExpression source, Expression? where)
             : base(DbExpressionType.Delete)
         {
             this.Table = table;
diff --git a/Signum.Engine/Linq/DbQueryProvider.cs b/Signum.Engine/Linq/DbQueryProvider.cs
index 5352d43af0..1cde442546 100644
--- a/Signum.Engine/Linq/DbQueryProvider.cs
+++ b/Signum.Engine/Linq/DbQueryProvider.cs
@@ -31,13 +31,13 @@ public SqlPreCommandSimple GetMainSqlCommand(Expression expression)
             return this.Translate(expression, tr => tr.MainCommand);
         }
 
-        public override object Execute(Expression expression)
+        public override object Execute(Expression expression) /*CSBUG*/
         {
             using (HeavyProfiler.Log("DBQuery", () => expression.Type.TypeName()))
-                return this.Translate(expression, tr => tr.Execute());
+                return this.Translate(expression, tr => tr.Execute()!);
         }
 
-        public async Task<object> ExecuteAsync(Expression expression, CancellationToken token)
+        public async Task<object?> ExecuteAsync(Expression expression, CancellationToken token)
         {
             using (HeavyProfiler.Log("DBQuery", () => expression.Type.TypeName()))
                 return await this.Translate(expression, tr => tr.ExecuteAsync(token));
diff --git a/Signum.Engine/Linq/ExpressionVisitor/AliasProjectionReplacer.cs b/Signum.Engine/Linq/ExpressionVisitor/AliasProjectionReplacer.cs
index f76ba0299f..6e52354c4b 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/AliasProjectionReplacer.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/AliasProjectionReplacer.cs
@@ -1,19 +1,24 @@
-using System.Linq.Expressions;
+using System.Linq.Expressions;
 
 namespace Signum.Engine.Linq
 {
     internal class AliasProjectionReplacer : DbExpressionVisitor
     {
-        ProjectionExpression root;
+        ProjectionExpression? root;
         AliasGenerator aliasGenerator;
 
+        public AliasProjectionReplacer(ProjectionExpression? root, AliasGenerator aliasGenerator)
+        {
+            this.root = root;
+            this.aliasGenerator = aliasGenerator;
+        }
+
         public static Expression Replace(Expression proj, AliasGenerator aliasGenerator)
         {
-            AliasProjectionReplacer apr = new AliasProjectionReplacer()
-            {
-                aliasGenerator = aliasGenerator,
-                root = proj as ProjectionExpression,
-            };
+            AliasProjectionReplacer apr = new AliasProjectionReplacer(
+                root:  proj as ProjectionExpression,
+                aliasGenerator : aliasGenerator
+            );
             return apr.Visit(proj);
         }
 
diff --git a/Signum.Engine/Linq/ExpressionVisitor/AliasReplacer.cs b/Signum.Engine/Linq/ExpressionVisitor/AliasReplacer.cs
index 466670b3cf..2c77f47c13 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/AliasReplacer.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/AliasReplacer.cs
@@ -8,16 +8,18 @@ namespace Signum.Engine.Linq
 {
     internal class AliasReplacer : DbExpressionVisitor
     {
-        Dictionary<Alias, Alias> aliasMap;
+        readonly Dictionary<Alias, Alias> aliasMap;
 
-        private AliasReplacer() { }
+        private AliasReplacer(Dictionary<Alias, Alias> aliasMap)
+        {
+            this.aliasMap = aliasMap;
+        }
 
         public static Expression Replace(Expression source, AliasGenerator aliasGenerator)
         {
-            AliasReplacer ap = new AliasReplacer()
-            {
-                aliasMap = DeclaredAliasGatherer.GatherDeclared(source).Reverse().ToDictionary(a => a, aliasGenerator.CloneAlias)
-            };
+            var aliasMap = DeclaredAliasGatherer.GatherDeclared(source).Reverse().ToDictionary(a => a, aliasGenerator.CloneAlias);
+
+            AliasReplacer ap = new AliasReplacer(aliasMap);
 
             return ap.Visit(source);
         }
@@ -39,7 +41,7 @@ protected internal override Expression VisitTable(TableExpression table)
         protected internal override Expression VisitSelect(SelectExpression select)
         {
             Expression top = this.Visit(select.Top);
-            SourceExpression from = this.VisitSource(select.From);
+            SourceExpression from = this.VisitSource(select.From!);
             Expression where = this.Visit(select.Where);
             ReadOnlyCollection<ColumnDeclaration> columns =  Visit(select.Columns, VisitColumnDeclaration);
             ReadOnlyCollection<OrderExpression> orderBy = Visit(select.OrderBy, VisitOrderBy);
diff --git a/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs b/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs
index cb84a3187d..a24344c1a7 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs
@@ -14,36 +14,16 @@ namespace Signum.Engine.Linq
     internal class ChildProjectionFlattener : DbExpressionVisitor
     {
         SelectExpression? currentSource;
-        AliasGenerator aliasGenerator;
-        private ChildProjectionFlattener(){}
+        readonly AliasGenerator aliasGenerator;
 
-        public Type? inMList = null;
-
-        protected internal override Expression VisitMListProjection(MListProjectionExpression mlp)
-        {
-            var oldInEntity = inMList;
-            inMList = mlp.Type;
-            var result = VisitProjection(mlp.Projection);
-            inMList = oldInEntity;
-            return result;
-        }
-
-        private static PropertyInfo GetOrderColumn(Type type)
+        private ChildProjectionFlattener(AliasGenerator aliasGenerator)
         {
-            if (!typeof(ICanBeOrdered).IsAssignableFrom(type))
-                throw new InvalidOperationException($"Type '{type.Name}' should implement '{nameof(ICanBeOrdered)}'");
-
-            var pi = type.GetProperty(nameof(ICanBeOrdered.Order), BindingFlags.Instance | BindingFlags.Public);
-
-            if (pi == null)
-                throw new InvalidOperationException("Order Property not found");
-
-            return pi;
+            this.aliasGenerator = aliasGenerator;
         }
 
         static internal ProjectionExpression Flatten(ProjectionExpression proj, AliasGenerator aliasGenerator)
         {
-            var result = (ProjectionExpression)new ChildProjectionFlattener { aliasGenerator = aliasGenerator }.Visit(proj);
+            var result = (ProjectionExpression)new ChildProjectionFlattener(aliasGenerator).Visit(proj);
             if (result == proj)
                 return result;
 
@@ -53,6 +33,16 @@ static internal ProjectionExpression Flatten(ProjectionExpression proj, AliasGen
             return (ProjectionExpression)subqueryCleaned;
         }
 
+        public Type? inMList = null;
+        protected internal override Expression VisitMListProjection(MListProjectionExpression mlp)
+        {
+            var oldInEntity = inMList;
+            inMList = mlp.Type;
+            var result = VisitProjection(mlp.Projection);
+            inMList = oldInEntity;
+            return result;
+        }
+        
         protected internal override Expression VisitProjection(ProjectionExpression proj)
         {
             if (currentSource == null)
@@ -119,7 +109,7 @@ protected internal override Expression VisitProjection(ProjectionExpression proj
                     List<ColumnDeclaration> columnsSMExternal = externalColumns.Select(ce => generatorSM.MapColumn(ce)).ToList();
                     List<ColumnDeclaration> columnsSMInternal = proj.Select.Columns.Select(cd => generatorSM.MapColumn(cd.GetReference(proj.Select.Alias))).ToList();
 
-                    SelectExpression @internal = ExtractOrders(proj.Select, out List<OrderExpression> innerOrders);
+                    SelectExpression @internal = ExtractOrders(proj.Select, out List<OrderExpression>? innerOrders);
 
                     Alias aliasSM = aliasGenerator.GetUniqueAlias(@internal.Alias.Name + "SM");
                     SelectExpression selectMany = new SelectExpression(aliasSM, false, null, columnsSMExternal.Concat(columnsSMInternal),
@@ -162,7 +152,7 @@ private SelectExpression WithoutOrder(SelectExpression sel)
             return new SelectExpression(sel.Alias, sel.IsDistinct, sel.Top, sel.Columns, sel.From, sel.Where, null, sel.GroupBy, sel.SelectOptions);
         }
 
-        private SelectExpression ExtractOrders(SelectExpression sel, out List<OrderExpression> innerOrders)
+        private SelectExpression ExtractOrders(SelectExpression sel, out List<OrderExpression>? innerOrders)
         {
             if (sel.Top != null || (sel.OrderBy.Count == 0))
             {
@@ -258,7 +248,7 @@ private static IEnumerable<ColumnExpression> KeysTable(TableExpression table)
                 if (table.Table is Table t && t.IsView)
                     yield return new ColumnExpression(typeof(int), table.Alias, t.Columns.Values.Single(a => a.PrimaryKey).Name);
                 else
-                    yield return new ColumnExpression(typeof(int), table.Alias, table.Table.PrimaryKey.Name);
+                    yield return new ColumnExpression(typeof(int), table.Alias, table!.Table.PrimaryKey.Name); /*CSBUG*/
             }
 
             private static IEnumerable<ColumnExpression> KeysSelect(SelectExpression select)
@@ -266,7 +256,7 @@ private static IEnumerable<ColumnExpression> KeysSelect(SelectExpression select)
                 if (select.GroupBy.Any())
                     return select.GroupBy.Select(ce => select.Columns.FirstOrDefault(cd => cd.Expression.Equals(ce) /*could be improved*/)?.Let(cd => cd.GetReference(select.Alias))).ToList();
 
-                IEnumerable<ColumnExpression> inner = Keys(select.From);
+                IEnumerable<ColumnExpression> inner = Keys(select.From!);
 
                 var result = inner.Select(ce => select.Columns.FirstOrDefault(cd => cd.Expression.Equals(ce))?.Let(cd => cd.GetReference(select.Alias))).ToList();
 
@@ -287,11 +277,16 @@ private static IEnumerable<ColumnExpression> KeysSelect(SelectExpression select)
 
         internal class ColumnReplacer : DbExpressionVisitor
         {
-            Dictionary<ColumnExpression, ColumnExpression> Replacements;
+            readonly Dictionary<ColumnExpression, ColumnExpression> Replacements;
+
+            public ColumnReplacer(Dictionary<ColumnExpression, ColumnExpression> replacements)
+            {
+                Replacements = replacements;
+            }
 
             public static Expression Replace(Expression expression, Dictionary<ColumnExpression, ColumnExpression> replacements)
             {
-                return new ColumnReplacer { Replacements = replacements }.Visit(expression);
+                return new ColumnReplacer(replacements).Visit(expression);
             }
 
             protected internal override Expression VisitColumn(ColumnExpression column)
@@ -307,18 +302,17 @@ protected internal override Expression VisitChildProjection(ChildProjectionExpre
 
         internal class ExternalColumnGatherer : DbExpressionVisitor
         {
-            Alias externalAlias;
-
-            HashSet<ColumnExpression> columns = new HashSet<ColumnExpression>();
-
-            private ExternalColumnGatherer() { }
+            readonly Alias externalAlias;
+            readonly HashSet<ColumnExpression> columns = new HashSet<ColumnExpression>();
 
+            public ExternalColumnGatherer(Alias externalAlias)
+            {
+                this.externalAlias = externalAlias;
+            }
+            
             public static HashSet<ColumnExpression> Gatherer(Expression source, Alias externalAlias)
             {
-                ExternalColumnGatherer ap = new ExternalColumnGatherer()
-                {
-                    externalAlias = externalAlias
-                };
+                ExternalColumnGatherer ap = new ExternalColumnGatherer(externalAlias);
 
                 ap.Visit(source);
 
diff --git a/Signum.Engine/Linq/ExpressionVisitor/ColumnProjector.cs b/Signum.Engine/Linq/ExpressionVisitor/ColumnProjector.cs
index bbb34f6bc9..9ee029e943 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/ColumnProjector.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/ColumnProjector.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq.Expressions;
@@ -32,9 +32,13 @@ internal class ColumnProjector : DbExpressionVisitor
         HashSet<Expression> candidates;
         Alias newAlias;
         bool projectTrivialColumns;
-
-
-        private ColumnProjector() { }
+        
+        public ColumnProjector(HashSet<Expression> candidates, Alias newAlias, bool projectTrivialColumns)
+        {
+            this.candidates = candidates;
+            this.newAlias = newAlias;
+            this.projectTrivialColumns = projectTrivialColumns;
+        }
 
         static internal ColumnExpression SingleProjection(ColumnDeclaration declaration, Alias newAlias, Type columnType)
         {
@@ -45,19 +49,13 @@ static internal ProjectedColumns ProjectColumns(Expression projector, Alias newA
         {
             var candidates = DbExpressionNominator.Nominate(projector, out Expression newProj, isGroupKey: isGroupKey);
 
-            ColumnProjector cp = new ColumnProjector
-            {
-                newAlias = newAlias,
-                candidates = candidates,
-                projectTrivialColumns = selectTrivialColumns
-            };
+            ColumnProjector cp = new ColumnProjector(candidates, newAlias, selectTrivialColumns);
 
             Expression e = cp.Visit(newProj);
 
-            return new ProjectedColumns(e, cp.generator.Columns.ToReadOnly());
+            return new ProjectedColumns(e, cp.generator.Columns.NotNull().ToReadOnly());
         }
-
-
+        
         public override Expression Visit(Expression expression)
         {
             if (this.candidates.Contains(expression))
@@ -105,16 +103,16 @@ internal class ColumnUnionProjector : DbExpressionVisitor
         UnionAllRequest request;
         Type implementation;
 
-        private ColumnUnionProjector() { }
-
+        public ColumnUnionProjector(HashSet<Expression> candidates, UnionAllRequest request, Type implementation)
+        {
+            this.candidates = candidates;
+            this.request = request;
+            this.implementation = implementation;
+        }
+        
         static internal Expression Project(Expression projector, HashSet<Expression> candidates, UnionAllRequest request, Type implementation)
         {
-            ColumnUnionProjector cp = new ColumnUnionProjector
-            {
-                request = request,
-                implementation = implementation,
-                candidates = candidates,
-            };
+            ColumnUnionProjector cp = new ColumnUnionProjector(candidates, request, implementation);
 
             return cp.Visit(projector);;
         }
@@ -137,6 +135,7 @@ public override Expression Visit(Expression expression)
                 }
                 else
                 {
+                    expression = expression! /*CSBUG*/;
                     if (expression.Type.UnNullify().IsEnum)
                     {
                         var convert = expression.TryConvert(expression.Type.IsNullable() ? typeof(int?) : typeof(int));
@@ -169,9 +168,9 @@ public ColumnGenerator(IEnumerable<ColumnDeclaration> columns)
                 this.columns.Add(item.Name ?? "-", item);
         }
 
-        public IEnumerable<ColumnDeclaration> Columns { get { return columns.Values; } }
+        public IEnumerable<ColumnDeclaration?> Columns { get { return columns.Values; } }
 
-        Dictionary<string, ColumnDeclaration> columns = new Dictionary<string, ColumnDeclaration>(StringComparer.InvariantCultureIgnoreCase);
+        Dictionary<string, ColumnDeclaration?> columns = new Dictionary<string, ColumnDeclaration?>(StringComparer.InvariantCultureIgnoreCase);
         int iColumn;
 
         public string GetUniqueColumnName(string name)
diff --git a/Signum.Engine/Linq/ExpressionVisitor/ConditionsRewriter.cs b/Signum.Engine/Linq/ExpressionVisitor/ConditionsRewriter.cs
index 25953eab3b..149dacebf9 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/ConditionsRewriter.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/ConditionsRewriter.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq.Expressions;
 using Signum.Utilities;
 using System.Collections.ObjectModel;
@@ -23,13 +23,13 @@ public IDisposable InSql()
             return new Disposable(() => inSql = oldInSelect);
         }
 
-        static BinaryExpression TrueCondition = Expression.Equal(new SqlConstantExpression(1), new SqlConstantExpression(1));
-        static BinaryExpression FalseCondition = Expression.Equal(new SqlConstantExpression(1), new SqlConstantExpression(0));
+        static readonly BinaryExpression TrueCondition = Expression.Equal(new SqlConstantExpression(1), new SqlConstantExpression(1));
+        static readonly BinaryExpression FalseCondition = Expression.Equal(new SqlConstantExpression(1), new SqlConstantExpression(0));
 
         Expression MakeSqlCondition(Expression exp)
         {
             if (exp == null)
-                return null;
+                return null!;
 
             if (!inSql || !IsBooleanExpression(exp))
                 return exp;
@@ -53,7 +53,7 @@ Expression MakeSqlCondition(Expression exp)
         Expression MakeSqlValue(Expression exp)
         {
             if (exp == null)
-                return null;
+                return null!;
 
             if (!inSql || !IsBooleanExpression(exp))
                 return exp;
@@ -114,7 +114,7 @@ static bool IsSqlCondition(Expression expression)
             }
 
             var exp = expression as DbExpression;
-            switch (exp.DbNodeType)
+            switch (exp!.DbNodeType) /*CSBUG*/
             {
                 case DbExpressionType.Exists:
                 case DbExpressionType.Like:
@@ -167,16 +167,16 @@ protected internal override Expression VisitSqlCast(SqlCastExpression castExpr)
 
         private bool IsTrue(Expression operand)
         {
-            return operand == TrueCondition || (operand is SqlConstantExpression && ((SqlConstantExpression)operand).Value.Equals(1));
+            return operand == TrueCondition || (operand is SqlConstantExpression c && object.Equals(c.Value, 1));
         }
 
         private bool IsFalse(Expression operand)
         {
-            return operand == FalseCondition || (operand is SqlConstantExpression && ((SqlConstantExpression)operand).Value.Equals(0));
+            return operand == FalseCondition || (operand is SqlConstantExpression c && object.Equals(c.Value, 0));
         }
 
-        static ConstantExpression False = Expression.Constant(false);
-        static ConstantExpression True = Expression.Constant(true);
+        static readonly ConstantExpression False = Expression.Constant(false);
+        static readonly ConstantExpression True = Expression.Constant(true);
 
         Expression SmartAnd(Expression left, Expression right, bool sortCircuit)
         {
@@ -317,7 +317,7 @@ protected internal override Expression VisitAggregate(AggregateExpression aggreg
         protected internal override Expression VisitSelect(SelectExpression select)
         {
             Expression top = this.Visit(select.Top);
-            SourceExpression from = this.VisitSource(select.From);
+            SourceExpression from = this.VisitSource(select.From!);
             Expression where = MakeSqlCondition(this.Visit(select.Where));
             ReadOnlyCollection<ColumnDeclaration> columns = Visit(select.Columns, VisitColumnDeclaration);
             ReadOnlyCollection<OrderExpression> orderBy = Visit(select.OrderBy, VisitOrderBy);
diff --git a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionComparer.cs b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionComparer.cs
index 629d0f0528..4e2d8390d3 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionComparer.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionComparer.cs
@@ -34,7 +34,7 @@ public static bool AreEqual(Expression a, Expression b, ScopedDictionary<Paramet
             return new DbExpressionComparer(parameterScope, aliasScope, checkParameterNames ).Compare(a, b);
         }
 
-        protected override bool Compare(Expression a, Expression b)
+        protected override bool Compare(Expression? a, Expression? b)
         {
             bool result = ComparePrivate(a, b);
 
@@ -46,7 +46,7 @@ protected override bool Compare(Expression a, Expression b)
 
 
 
-        private bool ComparePrivate(Expression a, Expression b)
+        private bool ComparePrivate(Expression? a, Expression? b)
         {
             if (a == b)
                 return true;
@@ -158,7 +158,7 @@ protected virtual bool CompareColumn(ColumnExpression a, ColumnExpression b)
             return CompareAlias(a.Alias, b.Alias) && a.Name == b.Name;
         }
 
-        protected virtual bool CompareAlias(Alias a, Alias b)
+        protected virtual bool CompareAlias(Alias? a, Alias? b)
         {
             if (a == null && b == null)
                 return true;
@@ -181,7 +181,7 @@ protected virtual bool CompareSelect(SelectExpression a, SelectExpression b)
 
             using (AliasScope())
             {
-                MapAliases(a.From, b.From);
+                MapAliases(a.From!, b.From!);
 
                 return Compare(a.Where, b.Where)
                     && CompareList(a.OrderBy, b.OrderBy, CompareOrder)
@@ -385,7 +385,7 @@ protected virtual bool CompareIn(InExpression a, InExpression b)
                 && CompareValues(a.Values , b.Values);
         }
 
-        protected virtual bool CompareValues(object[] a, object[] b)
+        protected virtual bool CompareValues(object[]? a, object[]? b)
         {
             if (a == b)
                 return true;
diff --git a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
index 1953166715..062692a671 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
@@ -36,7 +36,7 @@ internal class DbExpressionNominator : DbExpressionVisitor
 
         bool innerProjection = false;
 
-        HashSet<Expression> candidates = new HashSet<Expression>();
+        readonly HashSet<Expression> candidates = new HashSet<Expression>();
 
         T Add<T>(T expression) where T : Expression?
         {
@@ -89,8 +89,7 @@ public override Expression Visit(Expression? exp)
 
         private bool IsExcluded(Expression exp)
         {
-            DbExpression? expDb = exp as DbExpression;
-            if (expDb == null)
+            if (!(exp is DbExpression expDb))
                 return false;
 
             switch (expDb.DbNodeType)
@@ -572,18 +571,7 @@ protected Expression GetFormatToString(MethodCallExpression m, string? defaultFo
 
             return Add(result);
         }
-
-        private Expression DateAdd(SqlEnums part, Expression dateExpression, Expression intExpression)
-        {
-            return new SqlFunctionExpression(typeof(DateTime), null, SqlFunction.DATEADD.ToString(), new Expression[] { new SqlEnumExpression(part), dateExpression, intExpression });
-        }
-
-        private Expression MinusDatePart(SqlEnums part, Expression dateExpression)
-        {
-            return Expression.Negate(new SqlFunctionExpression(typeof(int), null, SqlFunction.DATEPART.ToString(), new Expression[] { new SqlEnumExpression(part), dateExpression }));
-        }
-
-
+        
         protected override Expression VisitBinary(BinaryExpression b)
         {
             if (b.NodeType == ExpressionType.Equal || b.NodeType == ExpressionType.NotEqual)
@@ -890,7 +878,7 @@ private Expression ConvertAvoidNominate(BinaryExpression b)
             throw new InvalidOperationException();
         }
 
-        static MethodInfo miSimpleConcat = ReflectionTools.GetMethodInfo(() => string.Concat("a", "b"));
+        static readonly MethodInfo miSimpleConcat = ReflectionTools.GetMethodInfo(() => string.Concat("a", "b"));
 
 
         protected override Expression VisitConditional(ConditionalExpression c)
@@ -1284,9 +1272,11 @@ protected override Expression VisitMember(MemberExpression m)
             {
                 case "string.IndexOf":
                     {
-                        Expression startIndex = m.TryGetArgument("startIndex")?.Let(e => Expression.Add(e, new SqlConstantExpression(1)));
+                        Expression? startIndex = m.TryGetArgument("startIndex")?.Let(e => Expression.Add(e, new SqlConstantExpression(1)));
 
-                        Expression? charIndex = TrySqlFunction(null, SqlFunction.CHARINDEX, m.Type, m.GetArgument("value"), m.Object, startIndex);
+                        Expression? charIndex = startIndex != null ? 
+                            TrySqlFunction(null, SqlFunction.CHARINDEX, m.Type, m.GetArgument("value"), m.Object, startIndex) :
+                            TrySqlFunction(null, SqlFunction.CHARINDEX, m.Type, m.GetArgument("value"), m.Object);
                         if (charIndex == null)
                             return null;
                         Expression result = Expression.Subtract(charIndex, new SqlConstantExpression(1));
@@ -1458,7 +1448,7 @@ protected override Expression VisitMember(MemberExpression m)
             return Add(acum);
         }
 
-        private Expression? TryEtc(Expression str, Expression max, Expression etcString)
+        private Expression? TryEtc(Expression str, Expression max, Expression? etcString)
         {
             var newStr = Visit(str);
             if (!Has(newStr))
@@ -1472,8 +1462,8 @@ protected override Expression VisitMember(MemberExpression m)
                 Expression.Call(miEtc3, newStr, max, etcString);
         }
 
-        static MethodInfo miEtc2 = ReflectionTools.GetMethodInfo(() => "".Etc(2));
-        static MethodInfo miEtc3 = ReflectionTools.GetMethodInfo(() => "".Etc(2, "..."));
+        static readonly MethodInfo miEtc2 = ReflectionTools.GetMethodInfo(() => "".Etc(2));
+        static readonly MethodInfo miEtc3 = ReflectionTools.GetMethodInfo(() => "".Etc(2, "..."));
 
         IDisposable ForceFullNominate()
         {
diff --git a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionVisitor.cs b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionVisitor.cs
index 8e92f16d28..d78cfdd03f 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionVisitor.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionVisitor.cs
@@ -99,12 +99,10 @@ protected internal virtual Expression VisitTypeEntity(TypeEntityExpression typeF
 
         [DebuggerStepThrough]
         protected static ReadOnlyDictionary<K, V> Visit<K, V>(ReadOnlyDictionary<K, V> dictionary, Func<V, V> newValue)
+            where K : object
             where V : class
         {
-            if (dictionary == null)
-                return null;
-
-            Dictionary<K, V> alternate = null;
+            Dictionary<K, V>? alternate = null;
             foreach (var k in dictionary.Keys)
             {
                 V item = dictionary[k];
@@ -310,7 +308,7 @@ protected internal virtual Expression VisitIn(InExpression @in)
                 if (select != null)
                     return new InExpression(expression, select);
                 else
-                    return InExpression.FromValues(expression, @in.Values);
+                    return InExpression.FromValues(expression, @in.Values!);
             }
             return @in;
         }
@@ -359,7 +357,7 @@ protected internal virtual Expression VisitAggregateRequest(AggregateRequestsExp
         protected internal virtual Expression VisitSelect(SelectExpression select)
         {
             Expression top = this.Visit(select.Top);
-            SourceExpression from = this.VisitSource(select.From);
+            SourceExpression from = this.VisitSource(select.From!);
             Expression where = this.Visit(select.Where);
             ReadOnlyCollection<ColumnDeclaration> columns = Visit(select.Columns, VisitColumnDeclaration);
             ReadOnlyCollection<OrderExpression> orderBy = Visit(select.OrderBy, VisitOrderBy);
@@ -385,8 +383,8 @@ protected internal virtual Expression VisitJoin(JoinExpression join)
 
         protected internal virtual Expression VisitSetOperator(SetOperatorExpression set)
         {
-            SourceWithAliasExpression left = (SourceWithAliasExpression)this.VisitSource(set.Left);
-            SourceWithAliasExpression right = (SourceWithAliasExpression)this.VisitSource(set.Right);
+            SourceWithAliasExpression left = (SourceWithAliasExpression)this.VisitSource(set.Left)!;
+            SourceWithAliasExpression right = (SourceWithAliasExpression)this.VisitSource(set.Right)!;
             if (left != set.Left || right != set.Right)
             {
                 return new SetOperatorExpression(set.Operator, left, right, set.Alias);
diff --git a/Signum.Engine/Linq/ExpressionVisitor/EntityCompleter.cs b/Signum.Engine/Linq/ExpressionVisitor/EntityCompleter.cs
index 9b72bb40dc..8819a55069 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/EntityCompleter.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/EntityCompleter.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using System.Linq.Expressions;
 using Signum.Entities;
@@ -11,12 +11,17 @@ namespace Signum.Engine.Linq
 {
     internal class EntityCompleter : DbExpressionVisitor
     {
-        QueryBinder binder;
+        readonly QueryBinder binder;
         ImmutableStack<Type> previousTypes = ImmutableStack<Type>.Empty;
 
+        public EntityCompleter(QueryBinder binder)
+        {
+            this.binder = binder;
+        }
+
         public static Expression Complete(Expression source, QueryBinder binder)
         {
-            EntityCompleter pc = new EntityCompleter() { binder = binder };
+            EntityCompleter pc = new EntityCompleter(binder);
 
             var result = pc.Visit(source);
 
@@ -41,7 +46,7 @@ protected internal override Expression VisitLiteReference(LiteReferenceExpressio
             return new LiteValueExpression(lite.Type, typeId, id, toStr);
         }
 
-        private Expression LiteToString(LiteReferenceExpression lite, Expression typeId)
+        private Expression? LiteToString(LiteReferenceExpression lite, Expression typeId)
         {
             if (lite.CustomToStr != null)
                 return Visit(lite.CustomToStr);
@@ -101,7 +106,7 @@ protected internal override Expression VisitEntity(EntityExpression ee)
 
             previousTypes = previousTypes.Push(ee.Type);
 
-            var bindings = VisitBindings(ee.Bindings);
+            var bindings = VisitBindings(ee.Bindings!);
 
             var mixins = Visit(ee.Mixins, VisitMixinEntity);
 
@@ -179,7 +184,7 @@ protected internal override Expression VisitAdditionalField(AdditionalFieldExpre
             if (newEx is ProjectionExpression newProj && newProj.Projector.Type.IsInstantiationOf(typeof(MList<>.RowIdElement)))
                 return new MListProjectionExpression(afe.Type, newProj);
 
-            return newEx;
+            return newEx!; /*CSBUG*/
         }
 
         protected internal override Expression VisitProjection(ProjectionExpression proj)
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
index a0118e2278..2466d16d64 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
@@ -85,7 +85,7 @@ public Expression BindQuery(Expression expression)
                         if (m.Arguments.Count == 2)
                             return this.BindSelectMany(m.Type, m.GetArgument("source"), m.GetArgument("selector").StripQuotes(), null);
                         else
-                            return this.BindSelectMany(m.Type, m.GetArgument("source"), m.GetArgument("collectionSelector").StripQuotes(), m.TryGetArgument("resultSelector").StripQuotes());
+                            return this.BindSelectMany(m.Type, m.GetArgument("source"), m.GetArgument("collectionSelector").StripQuotes(), m.TryGetArgument("resultSelector")?.StripQuotes());
                     case "Join":
                         return this.BindJoin(
                             m.Type, m.GetArgument("outer"), m.GetArgument("inner"),
@@ -105,14 +105,14 @@ public Expression BindQuery(Expression expression)
                             m.GetArgument("keySelector").StripQuotes(),
                             m.GetArgument("elementSelector").StripQuotes());
                     case "Any":
-                        return this.BindAnyAll(m.Type, m.GetArgument("source"), m.TryGetArgument("predicate").StripQuotes(), m.Method, m == root);
+                        return this.BindAnyAll(m.Type, m.GetArgument("source"), m.TryGetArgument("predicate")?.StripQuotes(), m.Method, m == root);
                     case "All":
                         return this.BindAnyAll(m.Type, m.GetArgument("source"), m.GetArgument("predicate").StripQuotes(), m.Method, m == root);
                     case "Contains":
                         return this.BindContains(m.Type, m.GetArgument("source"), m.TryGetArgument("item") ?? m.GetArgument("value"), m == root);
                     case "Count":
                         return this.BindAggregate(m.Type, m.Method.Name.ToEnum<AggregateSqlFunction>(),
-                          m.GetArgument("source"), m.TryGetArgument("predicate").StripQuotes(), m == root);
+                          m.GetArgument("source"), m.TryGetArgument("predicate")?.StripQuotes(), m == root);
                     case "Sum":
                     case "Min":
                     case "Max":
@@ -120,19 +120,19 @@ public Expression BindQuery(Expression expression)
                     case "StdDev":
                     case "StdDevP":
                         return this.BindAggregate(m.Type, m.Method.Name.ToEnum<AggregateSqlFunction>(),
-                            m.GetArgument("source"), m.TryGetArgument("selector").StripQuotes(), m == root);
+                            m.GetArgument("source"), m.TryGetArgument("selector")?.StripQuotes(), m == root);
                     case "First":
                     case "FirstOrDefault":
                     case "Single":
                     case "SingleOrDefault":
                         return BindUniqueRow(m.Type, m.Method.Name.ToEnum<UniqueFunction>(),
-                            m.GetArgument("source"), m.TryGetArgument("predicate").StripQuotes(), m == root);
+                            m.GetArgument("source"), m.TryGetArgument("predicate")?.StripQuotes(), m == root);
 
                     case "FirstEx":
                     case "SingleEx":
                     case "SingleOrDefaultEx":
                         return BindUniqueRow(m.Type, m.Method.Name.RemoveEnd(2).ToEnum<UniqueFunction>(),
-                           m.GetArgument("collection"), m.TryGetArgument("predicate").StripQuotes(), m == root);
+                           m.GetArgument("collection"), m.TryGetArgument("predicate")?.StripQuotes(), m == root);
                     case "Distinct":
                         return BindDistinct(m.Type, m.GetArgument("source"));
                     case "Reverse":
@@ -473,7 +473,7 @@ private Expression BindTake(Type resultType, Expression source, Expression count
         //Avoid self referencing SQL problems
         bool inTableValuedFunction = false;
         public Dictionary<ProjectionExpression, Expression> uniqueFunctionReplacements = new Dictionary<ProjectionExpression, Expression>(DbExpressionComparer.GetComparer<ProjectionExpression>(false));
-        private Expression BindUniqueRow(Type resultType, UniqueFunction function, Expression source, LambdaExpression predicate, bool isRoot)
+        private Expression BindUniqueRow(Type resultType, UniqueFunction function, Expression source, LambdaExpression? predicate, bool isRoot)
         {
             ProjectionExpression rawProjector = this.VisitCastProjection(source);
 
@@ -745,7 +745,7 @@ bool ExtractDistinct(Expression? source, out Expression? innerSource)
         }
 
 
-        private Expression? BindAggregate(Type resultType, AggregateSqlFunction aggregateFunction, Expression source, LambdaExpression selectorOrPredicate, bool isRoot)
+        private Expression? BindAggregate(Type resultType, AggregateSqlFunction aggregateFunction, Expression source, LambdaExpression? selectorOrPredicate, bool isRoot)
         {
             var (newSource, selector, distinct) = DisassembleAggregate(aggregateFunction, source, selectorOrPredicate, isRoot);
 
@@ -865,7 +865,7 @@ static Expression RestoreWrappedType(Expression expression, Type wrapType)
         }
 
 
-        private Expression BindAnyAll(Type resultType, Expression source, LambdaExpression predicate, MethodInfo method, bool isRoot)
+        private Expression BindAnyAll(Type resultType, Expression source, LambdaExpression? predicate, MethodInfo method, bool isRoot)
         {
             bool isAll = method.Name == "All";
 
@@ -875,7 +875,7 @@ private Expression BindAnyAll(Type resultType, Expression source, LambdaExpressi
             if (source is ConstantExpression constSource && !typeof(IQueryable).IsAssignableFrom(constSource.Type))
             {
                 System.Diagnostics.Debug.Assert(!isRoot);
-                Type oType = predicate.Parameters[0].Type;
+                Type oType = predicate!.Parameters[0].Type;
                 Expression[] exp = ((IEnumerable)constSource.Value).Cast<object>().Select(o => Expression.Invoke(predicate, Expression.Constant(o, oType))).ToArray();
 
                 Expression where = isAll ? exp.AggregateAnd() : exp.AggregateOr();
@@ -885,7 +885,7 @@ private Expression BindAnyAll(Type resultType, Expression source, LambdaExpressi
             else
             {
                 if (isAll)
-                    predicate = Expression.Lambda(Expression.Not(predicate.Body), predicate.Parameters.ToArray());
+                    predicate = Expression.Lambda(Expression.Not(predicate!.Body), predicate!.Parameters.ToArray());
 
                 if (predicate != null)
                     source = Expression.Call(typeof(Enumerable), "Where", method.GetGenericArguments(), source, predicate);
@@ -2192,7 +2192,7 @@ internal CommandExpression BindDelete(Expression source)
 
             if (pr.Projector is EntityExpression ee)
             {
-                Expression id = ee.Table.GetIdExpression(aliasGenerator.Table(ee.Table.GetName(isHistory)));
+                Expression id = ee.Table.GetIdExpression(aliasGenerator.Table(ee.Table.GetName(isHistory)))!;
 
                 commands.AddRange(ee.Table.TablesMList().Select(t =>
                 {
@@ -2212,7 +2212,7 @@ internal CommandExpression BindDelete(Expression source)
             {
                 var vn = eee.ViewTable!;
 
-                Expression id = vn.GetIdExpression(aliasGenerator.Table(vn.Name));
+                Expression id = vn.GetIdExpression(aliasGenerator.Table(vn.Name)).ThrowIfNull(() => $"{vn.Name} has no primary name");
 
                 commands.Add(new DeleteExpression(vn, false, pr.Select, SmartEqualizer.EqualNullable(id, eee.GetViewId())));
             }
@@ -2283,7 +2283,7 @@ internal CommandExpression BindUpdate(Expression source, LambdaExpression? partS
 
             if (entity is EntityExpression ee)
             {
-                Expression id = ee.Table.GetIdExpression(aliasGenerator.Table(ee.Table.GetName(isHistory)));
+                Expression id = ee.Table.GetIdExpression(aliasGenerator.Table(ee.Table.GetName(isHistory)))!;
 
                 condition = SmartEqualizer.EqualNullable(id, ee.ExternalId);
                 table = ee.Table;
@@ -2297,7 +2297,7 @@ internal CommandExpression BindUpdate(Expression source, LambdaExpression? partS
             }
             else if (entity is EmbeddedEntityExpression eee)
             {
-                Expression id = eee.ViewTable!.GetIdExpression(aliasGenerator.Table(eee.ViewTable!.GetName(isHistory)));
+                Expression id = eee.ViewTable!.GetIdExpression(aliasGenerator.Table(eee.ViewTable!.GetName(isHistory))).ThrowIfNull(() => $"{eee.ViewTable} has not primary key");
 
                 condition = SmartEqualizer.EqualNullable(id, eee.GetViewId());
                 table = eee.ViewTable!;
@@ -2643,9 +2643,9 @@ public EntityExpression Completed(EntityExpression entity)
             {
                 var table = entity.Table;
                 var newAlias = NextTableAlias(table.Name);
-                var id = table.GetIdExpression(newAlias);
+                var id = table.GetIdExpression(newAlias)!;
                 var period = table.GenerateSystemPeriod(newAlias, this);
-                var intersect = period.Intesection(entity.ExternalPeriod);
+                var intersect = period.Intesection(entity.ExternalPeriod); //TODO intersect not used! 
                 var bindings = table.GenerateBindings(newAlias, this, id, period);
                 var mixins = table.GenerateMixins(newAlias, this, id, period);
 
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs
index 41b669c6d3..c6c0c5aafb 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs
@@ -19,9 +19,6 @@ namespace Signum.Engine.Linq
     /// </summary>
     internal class QueryFormatter : DbExpressionVisitor
     {
-        public static readonly ThreadVariable<Func<SqlPreCommandSimple, SqlPreCommandSimple>> PostFormatter = Statics.ThreadVariable<Func<SqlPreCommandSimple, SqlPreCommandSimple>>("QueryFormatterPostFormatter");
-
-
         StringBuilder sb = new StringBuilder();
         int indent = 2;
         int depth;
@@ -33,6 +30,12 @@ class DbParameterPair
         {
             internal DbParameter Parameter;
             internal string Name;
+
+            public DbParameterPair(DbParameter parameter, string name)
+            {
+                Parameter = parameter;
+                Name = name;
+            }
         }
 
 
@@ -45,7 +48,7 @@ public string GetNextParamAlias()
             return "@p" + (parameter++);
         }
 
-        MethodInfo miCreateParameter = ReflectionTools.GetMethodInfo((ParameterBuilder s) => s.CreateParameter(null, SqlDbType.BigInt, null, false, null));
+        MethodInfo miCreateParameter = ReflectionTools.GetMethodInfo((ParameterBuilder s) => s.CreateParameter(null!, SqlDbType.BigInt, null, false, null));
 
         DbParameterPair CreateParameter(ConstantExpression value)
         {
@@ -60,11 +63,9 @@ DbParameterPair CreateParameter(ConstantExpression value)
 
             var pb = Connector.Current.ParameterBuilder;
 
-            return new DbParameterPair
-            {
-                Parameter = pb.CreateParameter(name, typePair.SqlDbType, typePair.UserDefinedTypeName, nullable, value.Value ?? DBNull.Value),
-                Name = name
-            };
+            var param = pb.CreateParameter(name, typePair.SqlDbType, typePair.UserDefinedTypeName, nullable, value.Value ?? DBNull.Value);
+
+            return new DbParameterPair(param, name);
         }
 
         ObjectNameOptions objectNameOptions;
@@ -83,7 +84,7 @@ static internal SqlPreCommandSimple Format(Expression expression)
 
             var sqlpc = new SqlPreCommandSimple(qf.sb.ToString(), parameters);
 
-            return PostFormatter.Value == null ? sqlpc : PostFormatter.Value.Invoke(sqlpc);
+            return sqlpc;
         }
 
         protected enum Indentation
@@ -673,7 +674,7 @@ protected internal override SourceExpression VisitSource(SourceExpression source
             else
                 this.VisitJoin((JoinExpression)source);
 
-            return source;
+            return source!; /*CSBUG*/
         }
 
         protected internal override Expression VisitJoin(JoinExpression join)
@@ -1000,25 +1001,4 @@ private InvalidOperationException InvalidSqlExpression(Expression expression)
         }
 
     }
-
-
-
-
-    public class QueryPostFormatter : IDisposable
-    {
-        Func<SqlPreCommandSimple, SqlPreCommandSimple> prePostFormatter = null;
-
-        public QueryPostFormatter(Func<SqlPreCommandSimple, SqlPreCommandSimple> postFormatter)
-        {
-            prePostFormatter = QueryFormatter.PostFormatter.Value;
-
-            QueryFormatter.PostFormatter.Value = postFormatter;
-        }
-
-        public void Dispose()
-        {
-            QueryFormatter.PostFormatter.Value = prePostFormatter;
-        }
-    }
-
 }
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryRebinder.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryRebinder.cs
index c443829c60..398d6675a0 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryRebinder.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryRebinder.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq;
@@ -13,15 +13,15 @@ internal class QueryRebinder : DbExpressionVisitor
     {
         ImmutableStack<Dictionary<ColumnExpression, ColumnExpression>> scopes = ImmutableStack<Dictionary<ColumnExpression, ColumnExpression>>.Empty;
 
-        public Dictionary<ColumnExpression, ColumnExpression> CurrentScope { get { return scopes.Peek(); } }
+        public Dictionary<ColumnExpression, ColumnExpression?> CurrentScope { get { return scopes.Peek(); } }
 
         private QueryRebinder() { }
 
 
         internal class ColumnCollector : DbExpressionVisitor
         {
-            internal Alias[] knownAliases;
-            internal Dictionary<ColumnExpression, ColumnExpression> currentScope;
+            internal Alias[] knownAliases = null!;
+            internal Dictionary<ColumnExpression, ColumnExpression?> currentScope = null!;
 
             protected internal override Expression VisitColumn(ColumnExpression column)
             {
@@ -135,7 +135,7 @@ private SourceWithAliasExpression VisitSetOperatorPart(SourceWithAliasExpression
         {
             using (NewScope())
             {
-                CurrentScope.AddRange(askedColumns.ToDictionary(c => new ColumnExpression(c.Type, part.Alias, c.Name), c => (ColumnExpression)null));
+                CurrentScope.AddRange(askedColumns.ToDictionary(c => new ColumnExpression(c.Type, part.Alias, c.Name), c => (ColumnExpression?)null));
                 return (SourceWithAliasExpression)Visit(part);
             }
         }
@@ -185,8 +185,8 @@ protected internal override Expression VisitInsertSelect(InsertSelectExpression
 
         protected internal override Expression VisitSelect(SelectExpression select)
         {
-            Dictionary<ColumnExpression, ColumnExpression> askedColumns = CurrentScope.Keys.Where(k => select.KnownAliases.Contains(k.Alias)).ToDictionary(k => k, k => (ColumnExpression)null);
-            Dictionary<ColumnExpression, ColumnExpression> externalAnswers = CurrentScope.Where(kvp => !select.KnownAliases.Contains(kvp.Key.Alias) && kvp.Value != null).ToDictionary();
+            Dictionary<ColumnExpression, ColumnExpression?> askedColumns = CurrentScope.Keys.Where(k => select.KnownAliases.Contains(k.Alias)).ToDictionary(k => k, k => (ColumnExpression)null);
+            Dictionary<ColumnExpression, ColumnExpression?> externalAnswers = CurrentScope.Where(kvp => !select.KnownAliases.Contains(kvp.Key.Alias) && kvp.Value != null).ToDictionary();
 
             var disposable = NewScope();//SCOPE START
             var scope = CurrentScope;
@@ -203,7 +203,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
             foreach (var e in select.GroupBy)
                 col.Visit(e);
 
-            SourceExpression from = this.VisitSource(select.From);
+            SourceExpression from = this.VisitSource(select.From!);
             Expression top = this.Visit(select.Top);
             Expression where = this.Visit(select.Where);
             ReadOnlyCollection<OrderExpression> orderBy = Visit(select.OrderBy, VisitOrderBy);
@@ -244,7 +244,7 @@ private static ReadOnlyCollection<OrderExpression> RemoveDuplicates(ReadOnlyColl
             return result.AsReadOnly();
         }
 
-        private ReadOnlyCollection<ColumnDeclaration> AnswerAndExpand(ReadOnlyCollection<ColumnDeclaration> columns, Alias currentAlias, Dictionary<ColumnExpression, ColumnExpression> askedColumns)
+        private ReadOnlyCollection<ColumnDeclaration> AnswerAndExpand(ReadOnlyCollection<ColumnDeclaration> columns, Alias currentAlias, Dictionary<ColumnExpression, ColumnExpression?> askedColumns)
         {
             ColumnGenerator cg = new ColumnGenerator(columns);
 
@@ -258,7 +258,7 @@ private ReadOnlyCollection<ColumnDeclaration> AnswerAndExpand(ReadOnlyCollection
                 }
                 else
                 {
-                    ColumnExpression colExp = CurrentScope[col];
+                    ColumnExpression? colExp = CurrentScope[col];
                     //if (expr is ColumnExpression colExp)
                     //{
                     ColumnDeclaration cd = cg.Columns.FirstOrDefault(c => c.Expression.Equals(colExp));
@@ -314,4 +314,4 @@ protected internal override Expression VisitScalar(ScalarExpression scalar)
     }
 
 
-}
\ No newline at end of file
+}
diff --git a/Signum.Engine/Linq/ExpressionVisitor/Replacer.cs b/Signum.Engine/Linq/ExpressionVisitor/Replacer.cs
index 5c69b0fecb..7558ebcb3b 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/Replacer.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/Replacer.cs
@@ -1,4 +1,4 @@
-using System.Linq.Expressions;
+using System.Linq.Expressions;
 
 namespace Signum.Engine.Linq
 {
@@ -10,15 +10,15 @@ internal class Replacer : DbExpressionVisitor
         Expression searchFor;
         Expression replaceWith;
 
-        private Replacer() { }
+        private Replacer(Expression searchFor, Expression replaceWith)
+        {
+            this.searchFor = searchFor;
+            this.replaceWith = replaceWith;
+        }
 
         static internal Expression Replace(Expression expression, Expression searchFor, Expression replaceWith)
         {
-            return new Replacer
-            {
-                searchFor = searchFor,
-                replaceWith = replaceWith
-            }.Visit(expression);
+            return new Replacer(searchFor, replaceWith).Visit(expression);
         }
 
         public override Expression Visit(Expression exp)
diff --git a/Signum.Engine/Linq/ExpressionVisitor/ScalarSubqueryRewriter.cs b/Signum.Engine/Linq/ExpressionVisitor/ScalarSubqueryRewriter.cs
index 99a3e830b3..f85851b420 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/ScalarSubqueryRewriter.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/ScalarSubqueryRewriter.cs
@@ -1,21 +1,17 @@
-using System.Collections.ObjectModel;
+using System.Collections.ObjectModel;
 using System.Linq.Expressions;
 
 namespace Signum.Engine.Linq
 {
     class ScalarSubqueryRewriter : DbExpressionVisitor
     {
-        SourceExpression currentFrom;
-
         Connector connector = Connector.Current;
-
-        bool inAggregate = false;
-
         public static Expression Rewrite(Expression expression)
         {
             return new ScalarSubqueryRewriter().Visit(expression);
         }
 
+        bool inAggregate = false;
         protected internal override Expression VisitAggregate(AggregateExpression aggregate)
         {
             var saveInAggregate = this.inAggregate;
@@ -29,6 +25,7 @@ protected internal override Expression VisitAggregate(AggregateExpression aggreg
             return result;
         }
 
+        SourceExpression? currentFrom;
         protected internal override Expression VisitSelect(SelectExpression select)
         {
             var saveFrom = this.currentFrom;
@@ -36,7 +33,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
 
             this.inAggregate = false;
 
-            SourceExpression from = this.VisitSource(select.From);
+            SourceExpression from = this.VisitSource(select.From!);
             this.currentFrom = from;
 
             Expression top = this.Visit(select.Top);
@@ -66,15 +63,15 @@ protected internal override Expression VisitScalar(ScalarExpression scalar)
             }
             else
             {
-                var select = scalar.Select;
+                var select = scalar.Select!;
                 if (string.IsNullOrEmpty(select.Columns[0].Name))
                 {
                     select = new SelectExpression(select.Alias, select.IsDistinct, select.Top,
                         new[] { new ColumnDeclaration("scalar", select.Columns[0].Expression) },
                         select.From, select.Where, select.OrderBy, select.GroupBy, select.SelectOptions);
                 }
-                this.currentFrom = new JoinExpression(JoinType.OuterApply, this.currentFrom, select, null);
-                return new ColumnExpression(scalar.Type, scalar.Select.Alias, select.Columns[0].Name);
+                this.currentFrom = new JoinExpression(JoinType.OuterApply, this.currentFrom!, select, null);
+                return new ColumnExpression(scalar.Type, scalar.Select!.Alias, select.Columns[0].Name);
             }
         }
     }
diff --git a/Signum.Engine/Linq/ExpressionVisitor/SubqueryRemover.cs b/Signum.Engine/Linq/ExpressionVisitor/SubqueryRemover.cs
index 4a842d48a6..1e29164e9d 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/SubqueryRemover.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/SubqueryRemover.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
 using Signum.Utilities;
@@ -9,16 +9,16 @@ internal class SubqueryRemover : DbExpressionVisitor
     {
         HashSet<SelectExpression> selectsToRemove;
         Dictionary<Alias, Dictionary<string, Expression>> map;
-
-        private SubqueryRemover() { }
+        
+        public SubqueryRemover(IEnumerable<SelectExpression> selectsToRemove)
+        {
+            this.map = selectsToRemove.ToDictionary(d => d.Alias, d => d.Columns.ToDictionary(d2 => d2.Name, d2 => d2.Expression));
+            this.selectsToRemove = new HashSet<SelectExpression>(selectsToRemove);
+        }
 
         public static Expression Remove(Expression expression, IEnumerable<SelectExpression> selectsToRemove)
         {
-            return new SubqueryRemover
-            {
-                map = selectsToRemove.ToDictionary(d => d.Alias, d => d.Columns.ToDictionary(d2 => d2.Name, d2 => d2.Expression)),
-                selectsToRemove = new HashSet<SelectExpression>(selectsToRemove)
-            }.Visit(expression);
+            return new SubqueryRemover(selectsToRemove).Visit(expression);
         }
 
         protected internal override Expression VisitSelect(SelectExpression select)
@@ -35,4 +35,4 @@ protected internal override Expression VisitColumn(ColumnExpression column)
                     ?.Let(d => d.GetOrThrow(column.Name, "Reference to undefined column {0}")) ?? column;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs b/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs
index 5e6234951b..1c9d1d6855 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs
@@ -18,7 +18,7 @@ internal static class TranslatorBuilder
     {
         internal static ITranslateResult Build(ProjectionExpression proj)
         {
-            Type type = proj.UniqueFunction == null ? proj.Type.ElementType() : proj.Type;
+            Type type = proj.UniqueFunction == null ? proj.Type.ElementType()! : proj.Type;
 
             return miBuildPrivate.GetInvoker(type)(proj);
         }
@@ -30,27 +30,24 @@ static TranslateResult<T> BuildPrivate<T>(ProjectionExpression proj)
             var eagerChildProjections = EagerChildProjectionGatherer.Gatherer(proj).Select(cp => BuildChild(cp)).ToList();
             var lazyChildProjections = LazyChildProjectionGatherer.Gatherer(proj).Select(cp => BuildChild(cp)).ToList();
 
-            Scope scope = new Scope
-            {
-                Alias = proj.Select.Alias,
-                Positions = proj.Select.Columns.Select((c, i) => new { c.Name, i }).ToDictionary(p => p.Name, p => p.i),
-            };
+            Scope scope = new Scope(
+                alias :proj.Select.Alias,
+                positions: proj.Select.Columns.Select((c, i) => new { c.Name, i }).ToDictionary(p => p.Name!, p => p.i) /*CSBUG*/
+            );
 
             Expression<Func<IProjectionRow, T>> lambda = ProjectionBuilder.Build<T>(proj.Projector, scope);
 
             var command = QueryFormatter.Format(proj.Select);
 
-            var result = new TranslateResult<T>
-            {
-                EagerProjections = eagerChildProjections,
-                LazyChildProjections = lazyChildProjections,
-
-                MainCommand = command,
+            var result = new TranslateResult<T>(
 
-                ProjectorExpression = lambda,
+                eagerProjections: eagerChildProjections,
+                lazyChildProjections: lazyChildProjections,
 
-                Unique = proj.UniqueFunction,
-            };
+                mainCommand: command,
+                projectorExpression: lambda,
+                unique: proj.UniqueFunction
+            );
 
             return result;
         }
@@ -59,56 +56,46 @@ static IChildProjection BuildChild(ChildProjectionExpression childProj)
         {
             var proj = childProj.Projection;
 
-            Type type = proj.UniqueFunction == null ? proj.Type.ElementType() : proj.Type;
+            Type type = proj.UniqueFunction == null ? proj.Type.ElementType()! : proj.Type;
 
             if(!type.IsInstantiationOf(typeof(KeyValuePair<,>)))
                 throw new InvalidOperationException("All child projections should create KeyValuePairs");
 
-            Scope scope = new Scope
-            {
-                Alias = proj.Select.Alias,
-                Positions = proj.Select.Columns.Select((c, i) => new { c.Name, i }).ToDictionary(p => p.Name, p => p.i),
-            };
+            Scope scope = new Scope(
+                alias: proj.Select.Alias,
+                positions: proj.Select.Columns.Select((c, i) => new { c.Name, i }).ToDictionary(p => p.Name!, p => p.i) /*CSBUG*/
+            );
 
 
             var types = type.GetGenericArguments();
 
-            IChildProjection result;
+            var command = QueryFormatter.Format(proj.Select);
+
             if (childProj.IsLazyMList)
             {
                 types[1] = types[1].GetGenericArguments()[0];
-
-                result = giLazyChild.GetInvoker(types)(proj.Projector, scope);
+                return giLazyChild.GetInvoker(types)(proj.Projector, scope, childProj.Token, command);
             }
             else
             {
-                result = giEagerChild.GetInvoker(types)(proj.Projector, scope);
+                return giEagerChild.GetInvoker(types)(proj.Projector, scope, childProj.Token, command);
             }
-
-            result.Token = childProj.Token;
-            result.Command = QueryFormatter.Format(proj.Select);
-
-            return result;
         }
 
-        static GenericInvoker<Func<Expression, Scope, IChildProjection>> giLazyChild =
-            new GenericInvoker<Func<Expression, Scope, IChildProjection>>((proj, scope) => LazyChild<int, bool>(proj, scope));
-        static IChildProjection LazyChild<K, V>(Expression projector, Scope scope)
+        static readonly GenericInvoker<Func<Expression, Scope, LookupToken, SqlPreCommandSimple, IChildProjection>> giLazyChild =
+            new GenericInvoker<Func<Expression, Scope, LookupToken, SqlPreCommandSimple, IChildProjection>>((proj, scope, token, sql) => LazyChild<int, bool>(proj, scope, token, sql));
+        static IChildProjection LazyChild<K, V>(Expression projector, Scope scope, LookupToken token, SqlPreCommandSimple command)
         {
-            return new LazyChildProjection<K, V>
-            {
-                ProjectorExpression = ProjectionBuilder.Build<KeyValuePair<K, MList<V>.RowIdElement>>(projector, scope),
-            };
+            var proj = ProjectionBuilder.Build<KeyValuePair<K, MList<V>.RowIdElement>>(projector, scope);
+            return new LazyChildProjection<K, V>(token, command, proj);
         }
 
-        static GenericInvoker<Func<Expression, Scope, IChildProjection>> giEagerChild =
-            new GenericInvoker<Func<Expression, Scope, IChildProjection>>((proj, scope) => EagerChild<int, bool>(proj, scope));
-        static IChildProjection EagerChild<K, V>(Expression projector, Scope scope)
+        static readonly GenericInvoker<Func<Expression, Scope, LookupToken, SqlPreCommandSimple, IChildProjection>> giEagerChild =
+            new GenericInvoker<Func<Expression, Scope, LookupToken, SqlPreCommandSimple, IChildProjection>>((proj, scope, token, sql) => EagerChild<int, bool>(proj, scope, token, sql));
+        static IChildProjection EagerChild<K, V>(Expression projector, Scope scope, LookupToken token, SqlPreCommandSimple command)
         {
-            return new EagerChildProjection<K, V>
-            {
-                ProjectorExpression = ProjectionBuilder.Build<KeyValuePair<K, V>>(projector, scope),
-            };
+            var proj = ProjectionBuilder.Build<KeyValuePair<K, V>>(projector, scope);
+            return new EagerChildProjection<K, V>(token, command, proj);
         }
 
         public static SqlPreCommandSimple BuildCommandResult(CommandExpression command)
@@ -172,34 +159,37 @@ protected internal override Expression VisitChildProjection(ChildProjectionExpre
         /// </summary>
         public class ProjectionBuilder : DbExpressionVisitor
         {
-            static ParameterExpression row = Expression.Parameter(typeof(IProjectionRow), "row");
+            static readonly ParameterExpression row = Expression.Parameter(typeof(IProjectionRow), "row");
 
-            static PropertyInfo piRetriever = ReflectionTools.GetPropertyInfo((IProjectionRow r) => r.Retriever);
-            static MemberExpression retriever = Expression.Property(row, piRetriever);
+            static readonly PropertyInfo piRetriever = ReflectionTools.GetPropertyInfo((IProjectionRow r) => r.Retriever);
+            static readonly MemberExpression retriever = Expression.Property(row, piRetriever);
 
-            static FieldInfo fiId = ReflectionTools.GetFieldInfo((Entity i) => i.id);
+            static readonly FieldInfo fiId = ReflectionTools.GetFieldInfo((Entity i) => i.id);
 
-            static MethodInfo miCached = ReflectionTools.GetMethodInfo((IRetriever r) => r.Complete<TypeEntity>(null, null)).GetGenericMethodDefinition();
-            static MethodInfo miRequest = ReflectionTools.GetMethodInfo((IRetriever r) => r.Request<TypeEntity>(null)).GetGenericMethodDefinition();
-            static MethodInfo miRequestIBA = ReflectionTools.GetMethodInfo((IRetriever r) => r.RequestIBA<TypeEntity>(null, null)).GetGenericMethodDefinition();
-            static MethodInfo miRequestLite = ReflectionTools.GetMethodInfo((IRetriever r) => r.RequestLite<TypeEntity>(null)).GetGenericMethodDefinition();
-            static MethodInfo miModifiablePostRetrieving = ReflectionTools.GetMethodInfo((IRetriever r) => r.ModifiablePostRetrieving<EmbeddedEntity>(null)).GetGenericMethodDefinition();
+            static readonly MethodInfo miCached = ReflectionTools.GetMethodInfo((IRetriever r) => r.Complete<TypeEntity>(null, null)).GetGenericMethodDefinition();
+            static readonly MethodInfo miRequest = ReflectionTools.GetMethodInfo((IRetriever r) => r.Request<TypeEntity>(null)).GetGenericMethodDefinition();
+            static readonly MethodInfo miRequestIBA = ReflectionTools.GetMethodInfo((IRetriever r) => r.RequestIBA<TypeEntity>(null, null)).GetGenericMethodDefinition();
+            static readonly MethodInfo miRequestLite = ReflectionTools.GetMethodInfo((IRetriever r) => r.RequestLite<TypeEntity>(null)).GetGenericMethodDefinition();
+            static readonly MethodInfo miModifiablePostRetrieving = ReflectionTools.GetMethodInfo((IRetriever r) => r.ModifiablePostRetrieving<EmbeddedEntity>(null)).GetGenericMethodDefinition();
 
             Scope scope;
 
+            public ProjectionBuilder(Scope scope)
+            {
+                this.scope = scope;
+            }
 
             static internal Expression<Func<IProjectionRow, T>> Build<T>(Expression expression, Scope scope)
             {
-                ProjectionBuilder pb = new ProjectionBuilder() { scope = scope };
+                ProjectionBuilder pb = new ProjectionBuilder(scope);
                 Expression body = pb.Visit(expression);
                 return Expression.Lambda<Func<IProjectionRow, T>>(body, row);
             }
 
             Expression NullifyColumn(Expression exp)
             {
-                ColumnExpression ce = exp as ColumnExpression;
-                if (ce == null)
-                    return exp;
+                if (!(exp is ColumnExpression ce))
+                    return exp!; /*CSBUG*/
 
                 if (ce.Type.IsNullable() || ce.Type.IsClass)
                     return ce;
@@ -433,7 +423,7 @@ protected internal override Expression VisitLiteValue(LiteValueExpression lite)
 
 
                 Expression nothing = Expression.Constant(null, lite.Type);
-                Expression liteConstructor = null;
+                Expression liteConstructor;
                 if (typeId is TypeEntityExpression)
                 {
                     Type type = ((TypeEntityExpression)typeId).TypeValue;
@@ -470,9 +460,9 @@ protected internal override Expression VisitLiteValue(LiteValueExpression lite)
                     return Expression.Call(retriever, miRequestLite.MakeGenericMethod(Lite.Extract(lite.Type)), liteConstructor);
             }
 
-            static MethodInfo miLiteCreateParse = ReflectionTools.GetMethodInfo(() => LiteCreateParse(null, null, null, null));
+            static readonly MethodInfo miLiteCreateParse = ReflectionTools.GetMethodInfo(() => LiteCreateParse(null, null, null, null));
 
-            static Lite<Entity> LiteCreateParse(Schema schema, PrimaryKey? typeId, string id, string toString)
+            static Lite<Entity>? LiteCreateParse(Schema schema, PrimaryKey? typeId, string id, string toString)
             {
                 if (typeId == null)
                     return null;
@@ -506,7 +496,7 @@ protected internal override Expression VisitMListElement(MListElementExpression
                     Expression.Constant(null, init.Type));
             }
 
-            private Type ConstantType(Expression typeId)
+            private Type? ConstantType(Expression typeId)
             {
                 if (typeId.NodeType == ExpressionType.Convert)
                     typeId = ((UnaryExpression)typeId).Operand;
@@ -541,6 +531,8 @@ protected internal override Expression VisitPrimaryKeyString(PrimaryKeyStringExp
 
             static readonly MethodInfo miTryParse = ReflectionTools.GetMethodInfo(() => TryParse(null, null));
 
+            
+
             static PrimaryKey? TryParse(Type type, string id)
             {
                 if (type == null)
@@ -586,8 +578,14 @@ internal class Scope
         public Alias Alias;
 
         public Dictionary<string, int> Positions;
+        
+        public Scope(Alias alias, Dictionary<string, int> positions)
+        {
+            Alias = alias;
+            Positions = positions;
+        }
 
-        static PropertyInfo miReader = ReflectionTools.GetPropertyInfo((IProjectionRow row) => row.Reader);
+        static readonly PropertyInfo miReader = ReflectionTools.GetPropertyInfo((IProjectionRow row) => row.Reader);
 
         public Expression GetColumnExpression(Expression row, Alias alias, string name, Type type)
         {
@@ -599,15 +597,15 @@ public Expression GetColumnExpression(Expression row, Alias alias, string name,
             return FieldReader.GetExpression(Expression.Property(row, miReader), position, type);
         }
 
-        static MethodInfo miLookupRequest = ReflectionTools.GetMethodInfo((IProjectionRow row) => row.LookupRequest<int, double>(null, 0, null)).GetGenericMethodDefinition();
-        static MethodInfo miLookup = ReflectionTools.GetMethodInfo((IProjectionRow row) => row.Lookup<int, double>(null, 0)).GetGenericMethodDefinition();
+        static readonly MethodInfo miLookupRequest = ReflectionTools.GetMethodInfo((IProjectionRow row) => row.LookupRequest<int, double>(null, 0, null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miLookup = ReflectionTools.GetMethodInfo((IProjectionRow row) => row.Lookup<int, double>(null, 0)).GetGenericMethodDefinition();
 
         public Expression LookupEager(Expression row, ChildProjectionExpression cProj)
         {
             if (cProj.IsLazyMList)
                 throw new InvalidOperationException("IsLazyMList not expected at this stage");
 
-            Type type = cProj.Projection.UniqueFunction == null ? cProj.Type.ElementType() : cProj.Type;
+            Type type = cProj.Projection.UniqueFunction == null ? cProj.Type.ElementType()! : cProj.Type;
 
             MethodInfo mi = miLookup.MakeGenericMethod(cProj.OuterKey.Type, type);
 
diff --git a/Signum.Engine/Linq/ExpressionVisitor/UpdateDeleteSimplifier.cs b/Signum.Engine/Linq/ExpressionVisitor/UpdateDeleteSimplifier.cs
index b6551d1f6e..277e9ade24 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/UpdateDeleteSimplifier.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/UpdateDeleteSimplifier.cs
@@ -1,4 +1,4 @@
-using System.Linq.Expressions;
+using System.Linq.Expressions;
 using Signum.Utilities;
 
 namespace Signum.Engine.Linq
@@ -8,25 +8,30 @@ class CommandSimplifier: DbExpressionVisitor
         bool removeSelectRowCount;
         AliasGenerator aliasGenerator;
 
+        public CommandSimplifier(bool removeSelectRowCount, AliasGenerator aliasGenerator)
+        {
+            this.removeSelectRowCount = removeSelectRowCount;
+            this.aliasGenerator = aliasGenerator;
+        }
 
         public static CommandExpression Simplify(CommandExpression ce, bool removeSelectRowCount, AliasGenerator aliasGenerator)
         {
-            return (CommandExpression)new CommandSimplifier { removeSelectRowCount = removeSelectRowCount, aliasGenerator = aliasGenerator }.Visit(ce);
+            return (CommandExpression)new CommandSimplifier(removeSelectRowCount, aliasGenerator).Visit(ce);
         }
 
         protected internal override Expression VisitSelectRowCount(SelectRowCountExpression src)
         {
             if (removeSelectRowCount)
-                return null;
+                return null!;
 
             return base.VisitSelectRowCount(src);
         }
 
         protected internal override Expression VisitDelete(DeleteExpression delete)
         {
-            var select = delete.Source as SelectExpression;
+            var select = (SelectExpression)delete.Source;
 
-            TableExpression table = select.From as TableExpression;
+            TableExpression? table = select.From as TableExpression;
 
             if (table == null || delete.Table != table.Table)
                 return delete;
@@ -84,7 +89,7 @@ private ColumnExpression ResolveColumn(ColumnExpression ce, SelectExpression sel
                 if(result == null)
                     return ce;
 
-                TableExpression table = (TableExpression)select.From;
+                TableExpression table = (TableExpression)select.From!;
 
                 if (table.Alias == result.Alias)
                 {
diff --git a/Signum.Engine/Linq/Meta/MetaEvaluator.cs b/Signum.Engine/Linq/Meta/MetaEvaluator.cs
index 1d73b2f779..925bed0d55 100644
--- a/Signum.Engine/Linq/Meta/MetaEvaluator.cs
+++ b/Signum.Engine/Linq/Meta/MetaEvaluator.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities.ExpressionTrees;
@@ -13,10 +13,10 @@ namespace Signum.Engine.Linq
     /// </summary>
     public class MetaEvaluator : ExpressionVisitor
     {
-        public static Expression Clean(Expression expression)
+        public static Expression? Clean(Expression expression)
         {
-            Expression expand = ExpressionCleaner.Clean(expression, MetaEvaluator.PartialEval, false);
-            Expression simplified = OverloadingSimplifier.Simplify(expand);
+            Expression? expand = ExpressionCleaner.Clean(expression, MetaEvaluator.PartialEval, false);
+            Expression? simplified = OverloadingSimplifier.Simplify(expand);
             return simplified;
         }
 
@@ -35,7 +35,7 @@ public static Expression PartialEval(Expression exp)
             return new MetaEvaluator { candidates = ExpressionNominator.Nominate(exp) }.Visit(exp);
         }
 
-        public override Expression Visit(Expression exp)
+        public override Expression? Visit(Expression exp)
         {
             if (exp == null)
             {
diff --git a/Signum.Engine/Linq/Meta/MetaExpression.cs b/Signum.Engine/Linq/Meta/MetaExpression.cs
index 307cbfdd6d..4f34777f5d 100644
--- a/Signum.Engine/Linq/Meta/MetaExpression.cs
+++ b/Signum.Engine/Linq/Meta/MetaExpression.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq.Expressions;
 using System.Reflection;
 using Signum.Entities;
@@ -69,7 +69,7 @@ public bool IsEntity
 
         public readonly Meta Meta;
 
-        public MetaExpression(Type type, Meta meta):
+        public MetaExpression(Type type, Meta? meta):
             base(MetaExpressionType.MetaExpression, type)
         {
             this.Meta = meta;
diff --git a/Signum.Engine/Linq/Meta/MetadataVisitor.cs b/Signum.Engine/Linq/Meta/MetadataVisitor.cs
index cf8f77585a..400fbfef51 100644
--- a/Signum.Engine/Linq/Meta/MetadataVisitor.cs
+++ b/Signum.Engine/Linq/Meta/MetadataVisitor.cs
@@ -24,7 +24,7 @@ internal class MetadataVisitor : ExpressionVisitor
 
         private MetadataVisitor() { }
 
-        static internal Dictionary<string, Meta> GatherMetadata(Expression expression)
+        static internal Dictionary<string, Meta?> GatherMetadata(Expression expression)
         {
             if (expression == null)
                 throw new ArgumentException("expression");
@@ -32,13 +32,10 @@ static internal Dictionary<string, Meta> GatherMetadata(Expression expression)
             if (!typeof(IQueryable).IsAssignableFrom(expression.Type))
                 throw new InvalidOperationException("Expression type is not IQueryable");
 
-            Expression simplified = MetaEvaluator.Clean(expression);
-
-            MetaProjectorExpression meta = new MetadataVisitor().Visit(simplified) as MetaProjectorExpression;
-
-            if (meta == null)
-                return null;
+            Expression? simplified = MetaEvaluator.Clean(expression);
 
+            var meta = (MetaProjectorExpression)new MetadataVisitor().Visit(simplified!);
+            
             var proj = meta.Projector;
 
             if (proj.NodeType != ExpressionType.New &&  //anonymous types
@@ -109,7 +106,7 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
                         if (m.Arguments.Count == 2)
                             return this.BindSelectMany(m.Type, m.GetArgument("source"), m.GetArgument("selector").StripQuotes(), null);
                         else
-                            return this.BindSelectMany(m.Type, m.GetArgument("source"), m.GetArgument("collectionSelector").StripQuotes(), m.TryGetArgument("resultSelector").StripQuotes());
+                            return this.BindSelectMany(m.Type, m.GetArgument("source"), m.GetArgument("collectionSelector").StripQuotes(), m.TryGetArgument("resultSelector")?.StripQuotes());
                     case "Join":
                         return this.BindJoin(
                             m.Type, m.GetArgument("outer"), m.GetArgument("inner"),
@@ -143,18 +140,18 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
                     case "Max":
                     case "Average":
                         return this.BindAggregate(m.Type, m.Method.Name.ToEnum<AggregateSqlFunction>(),
-                            m.GetArgument("source"), m.TryGetArgument("selector").StripQuotes());
+                            m.GetArgument("source"), m.TryGetArgument("selector")?.StripQuotes());
                     case "First":
                     case "FirstOrDefault":
                     case "Single":
                     case "SingleOrDefault":
                         return BindUniqueRow(m.Type, m.Method.Name.ToEnum<UniqueFunction>(),
-                            m.GetArgument("source"), m.TryGetArgument("predicate").StripQuotes());
+                            m.GetArgument("source"), m.TryGetArgument("predicate")?.StripQuotes());
                     case "FirstEx":
                     case "SingleEx":
                     case "SingleOrDefaultEx":
                         return BindUniqueRow(m.Type, m.Method.Name.RemoveEnd(2).ToEnum<UniqueFunction>(),
-                           m.GetArgument("collection"), m.TryGetArgument("predicate").StripQuotes());
+                           m.GetArgument("collection"), m.TryGetArgument("predicate")?.StripQuotes());
                     case "Distinct":
                         return BindDistinct(m.Type, m.GetArgument("source"));
                     case "Take":
@@ -225,7 +222,9 @@ private Expression MapAndVisit(LambdaExpression lambda, params MetaProjectorExpr
         public static MetaProjectorExpression AsProjection(Expression expression)
         {
             if (expression is MetaProjectorExpression mpe)
-                return (MetaProjectorExpression)mpe;
+                return mpe;
+
+            expression = expression!; /*CSBUG*/
 
             if (expression.NodeType == ExpressionType.New)
             {
@@ -234,7 +233,7 @@ public static MetaProjectorExpression AsProjection(Expression expression)
                     return (MetaProjectorExpression)nex.Arguments[1];
             }
 
-            Type elementType = expression.Type.ElementType();
+            Type? elementType = expression.Type.ElementType();
             if (elementType != null)
             {
                 if (expression is MetaExpression meta && meta.Meta is CleanMeta)
@@ -246,8 +245,7 @@ public static MetaProjectorExpression AsProjection(Expression expression)
                             new CleanMeta(route.TryGetImplementations(), route)));
                 }
 
-                return new MetaProjectorExpression(expression.Type,
-                     MakeVoidMeta(elementType));
+                return new MetaProjectorExpression(expression!/*CSBUG*/.Type, MakeVoidMeta(elementType));
             }
 
             throw new InvalidOperationException();
@@ -263,7 +261,7 @@ private Expression BindSkip(Type resultType, Expression source, Expression count
             return AsProjection(Visit(source));
         }
 
-        private Expression BindUniqueRow(Type resultType, UniqueFunction function, Expression source, LambdaExpression predicate)
+        private Expression BindUniqueRow(Type resultType, UniqueFunction function, Expression source, LambdaExpression? predicate)
         {
             return AsProjection(Visit(source)).Projector;
         }
@@ -293,7 +291,7 @@ private Expression BindContains(Type resultType, Expression source, Expression i
             return MakeVoidMeta(resultType);
         }
 
-        private Expression BindAggregate(Type resultType, AggregateSqlFunction aggregateFunction, Expression source, LambdaExpression selector)
+        private Expression BindAggregate(Type resultType, AggregateSqlFunction aggregateFunction, Expression source, LambdaExpression? selector)
         {
             MetaProjectorExpression mp = AsProjection(Visit(source));
             if (selector == null)
@@ -315,7 +313,7 @@ private Expression BindSelect(Type resultType, Expression source, LambdaExpressi
             return new MetaProjectorExpression(resultType, projector);
         }
 
-        protected virtual Expression BindSelectMany(Type resultType, Expression source, LambdaExpression collectionSelector, LambdaExpression resultSelector)
+        protected virtual Expression BindSelectMany(Type resultType, Expression source, LambdaExpression collectionSelector, LambdaExpression? resultSelector)
         {
             MetaProjectorExpression mp = AsProjection(Visit(source));
             MetaProjectorExpression collectionProjector = AsProjection(MapAndVisit(collectionSelector, mp));
@@ -359,7 +357,7 @@ protected virtual Expression BindThenBy(Expression source, LambdaExpression orde
             return AsProjection(Visit(source));
         }
 
-        public Type TableType(object value)
+        public Type? TableType(object value)
         {
             if (value == null)
                 return null;
@@ -380,7 +378,7 @@ public override Expression Visit(Expression exp)
 
         protected override Expression VisitConstant(ConstantExpression c)
         {
-            Type type = TableType(c.Value);
+            Type? type = TableType(c.Value);
             if (type != null)
             {
                 if (typeof(Entity).IsAssignableFrom(type))
@@ -452,6 +450,8 @@ static Expression BindMember(Expression source, MemberInfo member, Type memberTy
                 throw new InvalidOperationException("Property {0} not found on {1}".FormatWith(member.Name, mme.Type.TypeName()));
             }
 
+            source = source! /*CSBUG*/;
+
             if (typeof(ModifiableEntity).IsAssignableFrom(source.Type) || typeof(IEntity).IsAssignableFrom(source.Type))
             {
                 var pi = member as PropertyInfo ?? Reflector.TryFindPropertyInfo((FieldInfo)member);
diff --git a/Signum.Engine/Linq/TranslateResult.cs b/Signum.Engine/Linq/TranslateResult.cs
index b94e5c0744..63d8c465b4 100644
--- a/Signum.Engine/Linq/TranslateResult.cs
+++ b/Signum.Engine/Linq/TranslateResult.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -16,20 +16,20 @@ public interface ITranslateResult
 
         SqlPreCommandSimple MainCommand { get; set; }
 
-        object Execute();
-        Task<object> ExecuteAsync(CancellationToken token);
+        object? Execute();
+        Task<object?> ExecuteAsync(CancellationToken token);
 
         LambdaExpression GetMainProjector();
     }
 
     interface IChildProjection
     {
-        LookupToken Token { get; set; }
+        LookupToken Token { get; }
 
         void Fill(Dictionary<LookupToken, IEnumerable> lookups, IRetriever retriever);
         Task FillAsync(Dictionary<LookupToken, IEnumerable> lookups, IRetriever retriever, CancellationToken token);
 
-        SqlPreCommandSimple Command { get; set; }
+        SqlPreCommandSimple Command { get; }
 
         bool IsLazy { get; }
     }
@@ -38,10 +38,16 @@ interface IChildProjection
     class EagerChildProjection<K, V>: IChildProjection
     {
         public LookupToken Token { get; set; }
-
         public SqlPreCommandSimple Command { get; set; }
         internal Expression<Func<IProjectionRow, KeyValuePair<K, V>>> ProjectorExpression;
 
+        public EagerChildProjection(LookupToken token, SqlPreCommandSimple command, Expression<Func<IProjectionRow, KeyValuePair<K, V>>> projectorExpression)
+        {
+            Token = token;
+            Command = command;
+            ProjectorExpression = projectorExpression;
+        }
+
         public void Fill(Dictionary<LookupToken, IEnumerable> lookups, IRetriever retriever)
         {
             using (HeavyProfiler.Log("SQL", () => Command.sp_executesql()))
@@ -103,14 +109,21 @@ public bool IsLazy
 
     class LazyChildProjection<K, V> : IChildProjection
     {
-        public LookupToken Token { get; set; }
+        public LookupToken Token { get; }
 
-        public SqlPreCommandSimple Command { get; set; }
+        public SqlPreCommandSimple Command { get; }
         internal Expression<Func<IProjectionRow, KeyValuePair<K, MList<V>.RowIdElement>>> ProjectorExpression;
 
+        public LazyChildProjection(LookupToken token, SqlPreCommandSimple command, Expression<Func<IProjectionRow, KeyValuePair<K, MList<V>.RowIdElement>>> projectorExpression)
+        {
+            Token = token;
+            Command = command;
+            ProjectorExpression = projectorExpression;
+        }
+
         public void Fill(Dictionary<LookupToken, IEnumerable> lookups, IRetriever retriever)
         {
-            Dictionary<K, MList<V>> requests = (Dictionary<K, MList<V>>)lookups.TryGetC(Token);
+            Dictionary<K, MList<V>>? requests = (Dictionary<K, MList<V>>?)lookups.TryGetC(Token);
 
             if (requests == null)
                 return;
@@ -148,7 +161,7 @@ public void Fill(Dictionary<LookupToken, IEnumerable> lookups, IRetriever retrie
 
         public async Task FillAsync(Dictionary<LookupToken, IEnumerable> lookups, IRetriever retriever, CancellationToken token)
         {
-            Dictionary<K, MList<V>> requests = (Dictionary<K, MList<V>>)lookups.TryGetC(Token);
+            Dictionary<K, MList<V>>? requests = (Dictionary<K, MList<V>>?)lookups.TryGetC(Token);
 
             if (requests == null)
                 return;
@@ -197,21 +210,33 @@ class TranslateResult<T> : ITranslateResult
         internal List<IChildProjection> EagerProjections { get; set; }
         internal List<IChildProjection> LazyChildProjections { get; set; }
 
-        Dictionary<LookupToken, IEnumerable> lookups;
 
         public SqlPreCommandSimple MainCommand { get; set; }
         internal Expression<Func<IProjectionRow, T>> ProjectorExpression;
 
-        public object Execute()
+        public TranslateResult(
+            List<IChildProjection> eagerProjections, 
+            List<IChildProjection> lazyChildProjections,
+            SqlPreCommandSimple mainCommand, 
+            Expression<Func<IProjectionRow, T>> projectorExpression,
+            UniqueFunction? unique)
+        {
+            EagerProjections = eagerProjections;
+            LazyChildProjections = lazyChildProjections;
+            MainCommand = mainCommand;
+            ProjectorExpression = projectorExpression;
+            Unique = unique;
+        }
+
+        public object? Execute()
         {
             using (new EntityCache())
             using (Transaction tr = new Transaction())
             {
-                object result;
+                object? result;
                 using (var retriever = EntityCache.NewRetriever())
                 {
-                    if (EagerProjections.Any() || LazyChildProjections.Any())
-                        lookups = new Dictionary<LookupToken, IEnumerable>();
+                    var lookups = new Dictionary<LookupToken, IEnumerable>();
 
                     foreach (var child in EagerProjections)
                         child.Fill(lookups, retriever);
@@ -250,16 +275,15 @@ public object Execute()
             }
         }
 
-        public async Task<object> ExecuteAsync(CancellationToken token)
+        public async Task<object?> ExecuteAsync(CancellationToken token)
         {
             using (new EntityCache())
             using (Transaction tr = new Transaction())
             {
-                object result;
+                object? result;
                 using (var retriever = EntityCache.NewRetriever())
                 {
-                    if (EagerProjections.Any() || LazyChildProjections.Any())
-                        lookups = new Dictionary<LookupToken, IEnumerable>();
+                    var lookups = new Dictionary<LookupToken, IEnumerable>();
 
                     foreach (var child in EagerProjections)
                         child.Fill(lookups, retriever);
@@ -315,9 +339,9 @@ public string CleanCommandText()
         {
             try
             {
-                SqlPreCommand eager = EagerProjections?.Select(cp => cp.Command).Combine(Spacing.Double);
+                SqlPreCommand? eager = EagerProjections?.Select(cp => cp.Command).Combine(Spacing.Double);
 
-                SqlPreCommand lazy = LazyChildProjections?.Select(cp => cp.Command).Combine(Spacing.Double);
+                SqlPreCommand? lazy = LazyChildProjections?.Select(cp => cp.Command).Combine(Spacing.Double);
 
                 return SqlPreCommandConcat.Combine(Spacing.Double,
                     eager == null ? null : new SqlPreCommandSimple("--------- Eager Client Joins ----------------"),
@@ -325,7 +349,7 @@ public string CleanCommandText()
                     eager == null && lazy == null ? null : new SqlPreCommandSimple("--------- MAIN QUERY ------------------------"),
                     MainCommand,
                     lazy == null ? null :  new SqlPreCommandSimple("--------- Lazy Client Joins (if needed) -----"),
-                    lazy).PlainSql();
+                    lazy)!.PlainSql();
 
             }
             catch
diff --git a/Signum.Engine/Operations/Graph.cs b/Signum.Engine/Operations/Graph.cs
index b6af7dc82b..cbb50a8fb8 100644
--- a/Signum.Engine/Operations/Graph.cs
+++ b/Signum.Engine/Operations/Graph.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Engine.Basics;
@@ -21,14 +21,14 @@ public class Construct : _Construct<T>, IConstructOperation
             Type IOperation.OverridenType { get { return typeof(T); } }
             OperationType IOperation.OperationType { get { return OperationType.Constructor; } }
             bool IOperation.Returns { get { return true; } }
-            Type IOperation.ReturnType { get { return typeof(T); } }
-            IEnumerable<Enum> IOperation.UntypedFromStates { get { return null; } }
-            IEnumerable<Enum> IOperation.UntypedToStates { get { return Enumerable.Empty<Enum>(); } }
-            Type IOperation.StateType { get { return null; } }
+            Type? IOperation.ReturnType { get { return typeof(T); } }
+            IEnumerable<Enum>? IOperation.UntypedFromStates { get { return null; } }
+            IEnumerable<Enum>? IOperation.UntypedToStates { get { return Enumerable.Empty<Enum>(); } }
+            Type? IOperation.StateType { get { return null; } }
 
             public bool LogAlsoIfNotSaved { get; set; }
 
-            //public Func<object[], T> Construct { get; set; } (inherited)
+            //public Func<object[]?, T> Construct { get; set; } (inherited)
             public bool Lite { get { return false; } }
 
             public Construct(ConstructSymbol<T>.Simple symbol)
@@ -50,18 +50,18 @@ public static Construct Untyped<B>(ConstructSymbol<B>.Simple symbol)
                 return new Construct(symbol.Symbol);
             }
 
-            public void OverrideConstruct(Overrider<Func<object[], T>> overrider)
+            public void OverrideConstruct(Overrider<Func<object[]?, T>> overrider)
             {
                 this.Construct = overrider(this.Construct);
             }
 
-            IEntity IConstructOperation.Construct(params object[] args)
+            IEntity IConstructOperation.Construct(params object[]? args)
             {
                 using (HeavyProfiler.Log("Construct", () => operationSymbol.Key))
                 {
                     OperationLogic.AssertOperationAllowed(operationSymbol, typeof(T), inUserInterface: false);
 
-                    OperationLogEntity log = new OperationLogEntity
+                    OperationLogEntity? log = new OperationLogEntity
                     {
                         Operation = operationSymbol,
                         Start = TimeZoneManager.Now,
@@ -72,7 +72,7 @@ IEntity IConstructOperation.Construct(params object[] args)
                     {
                         using (Transaction tr = new Transaction())
                         {
-                            T result = null;
+                            T? result = null;
                             using (OperationLogic.AllowSave<T>())
                                 OperationLogic.OnSuroundOperation(this, log, null, args).EndUsing(_ =>
                                 {
@@ -92,7 +92,7 @@ IEntity IConstructOperation.Construct(params object[] args)
                             if (log != null)
                                 log.SaveLog();
 
-                            return tr.Commit(result);
+                            return tr.Commit(result!);
                         }
                     }
                     catch (Exception ex)
@@ -146,15 +146,15 @@ public class ConstructFrom<F> : IConstructorFromOperation
             OperationSymbol IOperation.OperationSymbol { get { return operationSymbol; } }
             Type IOperation.OverridenType { get { return typeof(F); } }
             OperationType IOperation.OperationType { get { return OperationType.ConstructorFrom; } }
-            IEnumerable<Enum> IOperation.UntypedFromStates { get { return null; } }
-            IEnumerable<Enum> IOperation.UntypedToStates { get { return Enumerable.Empty<Enum>(); } }
-            Type IOperation.StateType { get { return null; } }
+            IEnumerable<Enum>? IOperation.UntypedFromStates { get { return null; } }
+            IEnumerable<Enum>? IOperation.UntypedToStates { get { return Enumerable.Empty<Enum>(); } }
+            Type? IOperation.StateType { get { return null; } }
 
             public bool CanBeModified { get; set; }
             public bool LogAlsoIfNotSaved { get; set; }
 
             bool IOperation.Returns { get { return true; } }
-            Type IOperation.ReturnType { get { return typeof(T); } }
+            Type? IOperation.ReturnType { get { return typeof(T); } }
 
             protected readonly Type baseType;
             Type IEntityOperation.BaseType { get { return baseType; } }
@@ -162,17 +162,17 @@ public class ConstructFrom<F> : IConstructorFromOperation
 
             public bool CanBeNew { get; set; }
 
-            public Func<F, string> CanConstruct { get; set; }
+            public Func<F, string?>? CanConstruct { get; set; }
 
-            public ConstructFrom<F> OverrideCanConstruct(Overrider<Func<F, string>> overrider)
+            public ConstructFrom<F> OverrideCanConstruct(Overrider<Func<F, string?>> overrider)
             {
                 this.CanConstruct = overrider(this.CanConstruct ?? (f => null));
                 return this;
             }
 
-            public Func<F, object[], T> Construct { get; set; }
+            public Func<F, object[]?, T> Construct { get; set; } = null!;
 
-            public void OverrideConstruct(Overrider<Func<F, object[], T>> overrider)
+            public void OverrideConstruct(Overrider<Func<F, object[]?, T>> overrider)
             {
                 this.Construct = overrider(this.Construct);
             }
@@ -198,12 +198,12 @@ public static ConstructFrom<F> Untyped<B>(ConstructSymbol<B>.From<F> symbol)
                 return new ConstructFrom<F>(symbol.Symbol, symbol.BaseType);
             }
 
-            string IEntityOperation.CanExecute(IEntity entity)
+            string? IEntityOperation.CanExecute(IEntity entity)
             {
                 return OnCanConstruct(entity);
             }
 
-            string OnCanConstruct(IEntity entity)
+            string? OnCanConstruct(IEntity entity)
             {
                 if (entity.IsNew && !CanBeNew)
                     return EngineMessage.TheEntity0IsNew.NiceToString().FormatWith(entity);
@@ -214,17 +214,17 @@ string OnCanConstruct(IEntity entity)
                 return null;
             }
 
-            IEntity IConstructorFromOperation.Construct(IEntity origin, params object[] args)
+            IEntity IConstructorFromOperation.Construct(IEntity origin, params object[]? args)
             {
                 using (HeavyProfiler.Log("ConstructFrom", () => operationSymbol.Key))
                 {
                     OperationLogic.AssertOperationAllowed(operationSymbol, origin.GetType(), inUserInterface: false);
 
-                    string error = OnCanConstruct(origin);
+                    string? error = OnCanConstruct(origin);
                     if (error != null)
                         throw new ApplicationException(error);
 
-                    OperationLogEntity log = new OperationLogEntity
+                    OperationLogEntity? log = new OperationLogEntity
                     {
                         Operation = operationSymbol,
                         Start = TimeZoneManager.Now,
@@ -236,7 +236,7 @@ IEntity IConstructorFromOperation.Construct(IEntity origin, params object[] args
                     {
                         using (Transaction tr = new Transaction())
                         {
-                            T result = null;
+                            T? result = null;
                             using (OperationLogic.AllowSave(origin.GetType()))
                             using (OperationLogic.AllowSave<T>())
                                 OperationLogic.OnSuroundOperation(this, log, origin, args).EndUsing(_ =>
@@ -259,7 +259,7 @@ IEntity IConstructorFromOperation.Construct(IEntity origin, params object[] args
                             if (log != null)
                                 log.SaveLog();
 
-                            return tr.Commit(result);
+                            return tr.Commit(result!);
                         }
                     }
                     catch (Exception ex)
@@ -314,19 +314,19 @@ public class ConstructFromMany<F> : IConstructorFromManyOperation
             Type IOperation.OverridenType { get { return typeof(F); } }
             OperationType IOperation.OperationType { get { return OperationType.ConstructorFromMany; } }
             bool IOperation.Returns { get { return true; } }
-            Type IOperation.ReturnType { get { return typeof(T); } }
+            Type? IOperation.ReturnType { get { return typeof(T); } }
 
             protected readonly Type baseType;
             Type IConstructorFromManyOperation.BaseType { get { return baseType; } }
-            IEnumerable<Enum> IOperation.UntypedFromStates { get { return null; } }
-            IEnumerable<Enum> IOperation.UntypedToStates { get { return Enumerable.Empty<Enum>(); } }
-            Type IOperation.StateType { get { return null; } }
+            IEnumerable<Enum>? IOperation.UntypedFromStates { get { return null; } }
+            IEnumerable<Enum>? IOperation.UntypedToStates { get { return Enumerable.Empty<Enum>(); } }
+            Type? IOperation.StateType { get { return null; } }
 
             public bool LogAlsoIfNotSaved { get; set; }
 
-            public Func<List<Lite<F>>, object[], T> Construct { get; set; }
+            public Func<List<Lite<F>>, object[]?, T> Construct { get; set; } = null!;
 
-            public void OverrideConstruct(Overrider<Func<List<Lite<F>>, object[], T>> overrider)
+            public void OverrideConstruct(Overrider<Func<List<Lite<F>>, object[]?, T>> overrider)
             {
                 this.Construct = overrider(this.Construct);
             }
@@ -354,7 +354,7 @@ public static ConstructFromMany<F> Untyped<B>(ConstructSymbol<B>.FromMany<F> sym
             }
 
 
-            IEntity IConstructorFromManyOperation.Construct(IEnumerable<Lite<IEntity>> lites, params object[] args)
+            IEntity IConstructorFromManyOperation.Construct(IEnumerable<Lite<IEntity>> lites, params object[]? args)
             {
                 using (HeavyProfiler.Log("ConstructFromMany", () => operationSymbol.Key))
                 {
@@ -363,7 +363,7 @@ IEntity IConstructorFromManyOperation.Construct(IEnumerable<Lite<IEntity>> lites
                         OperationLogic.AssertOperationAllowed(operationSymbol, type, inUserInterface: false);
                     }
 
-                    OperationLogEntity log = new OperationLogEntity
+                    OperationLogEntity? log = new OperationLogEntity
                     {
                         Operation = operationSymbol,
                         Start = TimeZoneManager.Now,
@@ -374,7 +374,7 @@ IEntity IConstructorFromManyOperation.Construct(IEnumerable<Lite<IEntity>> lites
                     {
                         using (Transaction tr = new Transaction())
                         {
-                            T result = null;
+                            T? result = null;
 
                             using (OperationLogic.AllowSave<F>())
                             using (OperationLogic.AllowSave<T>())
@@ -398,7 +398,7 @@ IEntity IConstructorFromManyOperation.Construct(IEnumerable<Lite<IEntity>> lites
                             if (log != null)
                                 log.SaveLog();
 
-                            return tr.Commit(result);
+                            return tr.Commit(result!);
                         }
                     }
                     catch (Exception ex)
@@ -427,7 +427,7 @@ IEntity IConstructorFromManyOperation.Construct(IEnumerable<Lite<IEntity>> lites
                 }
             }
 
-            protected virtual T OnConstruct(List<Lite<F>> lites, object[] args)
+            protected virtual T OnConstruct(List<Lite<F>> lites, object[]? args)
             {
                 return Construct(lites, args);
             }
@@ -456,26 +456,26 @@ public class Execute : _Execute<T>, IExecuteOperation
             OperationType IOperation.OperationType { get { return OperationType.Execute; } }
             public bool CanBeModified { get; set; }
             bool IOperation.Returns { get { return true; } }
-            Type IOperation.ReturnType { get { return null; } }
-            Type IOperation.StateType { get { return null; } }
+            Type? IOperation.ReturnType { get { return null; } }
+            Type? IOperation.StateType { get { return null; } }
 
             Type IEntityOperation.BaseType { get { return Symbol.BaseType; } }
             bool IEntityOperation.HasCanExecute { get { return CanExecute != null; } }
-            IEnumerable<Enum> IOperation.UntypedFromStates { get { return Enumerable.Empty<Enum>(); } }
-            IEnumerable<Enum> IOperation.UntypedToStates { get { return Enumerable.Empty<Enum>(); } }
+            IEnumerable<Enum>? IOperation.UntypedFromStates { get { return Enumerable.Empty<Enum>(); } }
+            IEnumerable<Enum>? IOperation.UntypedToStates { get { return Enumerable.Empty<Enum>(); } }
 
             public bool CanBeNew { get; set; }
 
-            //public Action<T, object[]> Execute { get; set; } (inherited)
-            public Func<T, string> CanExecute { get; set; }
+            //public Action<T, object[]?> Execute { get; set; } (inherited)
+            public Func<T, string?>? CanExecute { get; set; }
 
-            public Execute OverrideCanExecute(Overrider<Func<T, string>> overrider)
+            public Execute OverrideCanExecute(Overrider<Func<T, string?>> overrider)
             {
                 this.CanExecute = overrider(this.CanExecute ?? (t => null));
                 return this;
             }
 
-            public void OverrideExecute(Overrider<Action<T, object[]>> overrider)
+            public void OverrideExecute(Overrider<Action<T, object[]?>> overrider)
             {
                 this.Execute = overrider(this.Execute);
             }
@@ -485,12 +485,12 @@ public Execute(ExecuteSymbol<T> symbol)
                 this.Symbol = symbol ?? throw AutoInitAttribute.ArgumentNullException(typeof(ExecuteSymbol<T>), nameof(symbol));
             }
 
-            string IEntityOperation.CanExecute(IEntity entity)
+            string? IEntityOperation.CanExecute(IEntity entity)
             {
                 return OnCanExecute((T)entity);
             }
 
-            protected virtual string OnCanExecute(T entity)
+            protected virtual string? OnCanExecute(T entity)
             {
                 if (entity.IsNew && !CanBeNew)
                     return EngineMessage.TheEntity0IsNew.NiceToString().FormatWith(entity);
@@ -501,13 +501,13 @@ protected virtual string OnCanExecute(T entity)
                 return null;
             }
 
-            void IExecuteOperation.Execute(IEntity entity, params object[] args)
+            void IExecuteOperation.Execute(IEntity entity, params object[]? args)
             {
                 using (HeavyProfiler.Log("Execute", () => Symbol.Symbol.Key))
                 {
                     OperationLogic.AssertOperationAllowed(Symbol.Symbol, entity.GetType(), inUserInterface: false);
 
-                    string error = OnCanExecute((T)entity);
+                    string? error = OnCanExecute((T)entity);
                     if (error != null)
                         throw new ApplicationException(error);
 
@@ -594,26 +594,26 @@ public class Delete : _Delete<T>, IDeleteOperation
             OperationType IOperation.OperationType { get { return OperationType.Delete; } }
             public bool CanBeModified { get; set; }
             bool IOperation.Returns { get { return false; } }
-            Type IOperation.ReturnType { get { return null; } }
-            IEnumerable<Enum> IOperation.UntypedFromStates { get { return Enumerable.Empty<Enum>(); } }
-            IEnumerable<Enum> IOperation.UntypedToStates { get { return null; } }
-            Type IOperation.StateType { get { return null; } }
+            Type? IOperation.ReturnType { get { return null; } }
+            IEnumerable<Enum>? IOperation.UntypedFromStates { get { return Enumerable.Empty<Enum>(); } }
+            IEnumerable<Enum>? IOperation.UntypedToStates { get { return null; } }
+            Type? IOperation.StateType { get { return null; } }
 
             public bool CanBeNew { get { return false; } }
 
             Type IEntityOperation.BaseType { get { return Symbol.BaseType; } }
             bool IEntityOperation.HasCanExecute { get { return CanDelete != null; } }
 
-            //public Action<T, object[]> Delete { get; set; } (inherited)
-            public Func<T, string> CanDelete { get; set; }
+            //public Action<T, object[]?> Delete { get; set; } (inherited)
+            public Func<T, string?>? CanDelete { get; set; }
 
-            public Delete OverrideCanDelete(Overrider<Func<T, string>> overrider)
+            public Delete OverrideCanDelete(Overrider<Func<T, string?>> overrider)
             {
                 this.CanDelete = overrider(this.CanDelete ?? (t => null));
                 return this;
             }
 
-            public void OverrideDelete(Overrider<Action<T, object[]>> overrider)
+            public void OverrideDelete(Overrider<Action<T, object[]?>> overrider)
             {
                 this.Delete = overrider(this.Delete);
             }
@@ -623,12 +623,12 @@ public Delete(DeleteSymbol<T> symbol)
                 this.Symbol = symbol ?? throw AutoInitAttribute.ArgumentNullException(typeof(DeleteSymbol<T>), nameof(symbol));
             }
 
-            string IEntityOperation.CanExecute(IEntity entity)
+            string? IEntityOperation.CanExecute(IEntity entity)
             {
                 return OnCanDelete((T)entity);
             }
 
-            protected virtual string OnCanDelete(T entity)
+            protected virtual string? OnCanDelete(T entity)
             {
                 if (entity.IsNew)
                     return EngineMessage.TheEntity0IsNew.NiceToString().FormatWith(entity);
@@ -639,13 +639,13 @@ protected virtual string OnCanDelete(T entity)
                 return null;
             }
 
-            void IDeleteOperation.Delete(IEntity entity, params object[] args)
+            void IDeleteOperation.Delete(IEntity entity, params object[]? args)
             {
                 using (HeavyProfiler.Log("Delete", () => Symbol.Symbol.Key))
                 {
                     OperationLogic.AssertOperationAllowed(Symbol.Symbol, entity.GetType(), inUserInterface: false);
 
-                    string error = OnCanDelete((T)entity);
+                    string? error = OnCanDelete((T)entity);
                     if (error != null)
                         throw new ApplicationException(error);
 
@@ -698,7 +698,7 @@ void IDeleteOperation.Delete(IEntity entity, params object[] args)
                 }
             }
 
-            protected virtual void OnDelete(T entity, object[] args)
+            protected virtual void OnDelete(T entity, object[]? args)
             {
                 Delete(entity, args);
             }
diff --git a/Signum.Engine/Operations/GraphState.cs b/Signum.Engine/Operations/GraphState.cs
index bb8e37042a..75e1b813cb 100644
--- a/Signum.Engine/Operations/GraphState.cs
+++ b/Signum.Engine/Operations/GraphState.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities;
@@ -35,8 +35,8 @@ public interface IGraphFromStatesOperation : IGraphOperation, IGraphHasFromState
         public class Construct : Graph<T>.Construct, IGraphToStateOperation
         {
             public List<S> ToStates { get; private set; } = new List<S>();
-            IEnumerable<Enum> IOperation.UntypedToStates { get { return ToStates.Cast<Enum>(); } }
-            Type IOperation.StateType { get { return typeof(S); } }
+            IEnumerable<Enum>? IOperation.UntypedToStates { get { return ToStates.Cast<Enum>(); } }
+            Type? IOperation.StateType { get { return typeof(S); } }
 
             public Construct(ConstructSymbol<T>.Simple symbol)
                 : base(symbol)
@@ -90,8 +90,8 @@ public class ConstructFrom<F> : Graph<T>.ConstructFrom<F>, IGraphToStateOperatio
             where F : class, IEntity
         {
             public List<S> ToStates { get; private set; } = new List<S>();
-            IEnumerable<Enum> IOperation.UntypedToStates { get { return ToStates.Cast<Enum>(); } }
-            Type IOperation.StateType { get { return typeof(S); } }
+            IEnumerable<Enum>? IOperation.UntypedToStates { get { return ToStates.Cast<Enum>(); } }
+            Type? IOperation.StateType { get { return typeof(S); } }
 
             public ConstructFrom(ConstructSymbol<T>.From<F> symbol)
                 : base(symbol)
@@ -135,8 +135,8 @@ public class ConstructFromMany<F> : Graph<T>.ConstructFromMany<F>, IGraphToState
             where F : class, IEntity
         {
             public List<S> ToStates { get; private set; } = new List<S>();
-            IEnumerable<Enum> IOperation.UntypedToStates { get { return ToStates.Cast<Enum>(); } }
-            Type IOperation.StateType { get { return typeof(S); } }
+            IEnumerable<Enum>? IOperation.UntypedToStates { get { return ToStates.Cast<Enum>(); } }
+            Type? IOperation.StateType { get { return typeof(S); } }
 
             public ConstructFromMany(ConstructSymbol<T>.FromMany<F> symbol)
                 : base(symbol)
@@ -182,9 +182,9 @@ public class Execute : Graph<T>.Execute, IGraphToStateOperation, IGraphFromState
         {
             public List<S> FromStates { get; private set; }
             public List<S> ToStates { get; private set; }
-            IEnumerable<Enum> IOperation.UntypedToStates { get { return ToStates.Cast<Enum>(); } }
-            IEnumerable<Enum> IOperation.UntypedFromStates { get { return FromStates.Cast<Enum>(); } }
-            Type IOperation.StateType { get { return typeof(S); } }
+            IEnumerable<Enum>? IOperation.UntypedToStates { get { return ToStates.Cast<Enum>(); } }
+            IEnumerable<Enum>? IOperation.UntypedFromStates { get { return FromStates.Cast<Enum>(); } }
+            Type? IOperation.StateType { get { return typeof(S); } }
 
             bool IGraphHasFromStatesOperation.HasFromStates
             {
@@ -200,14 +200,14 @@ public Execute(ExecuteSymbol<T> symbol)
 
             bool IEntityOperation.HasCanExecute { get { return true; } }
 
-            protected override string OnCanExecute(T entity)
+            protected override string? OnCanExecute(T entity)
             {
                 S state = Graph<T, S>.GetStateFunc(entity);
 
                 if (!FromStates.Contains(state))
                     return OperationMessage.StateShouldBe0InsteadOf1.NiceToString().FormatWith(
-                        FromStates.CommaOr(v => ((Enum)(object)v).NiceToString()),
-                        ((Enum)(object)state).NiceToString());
+                        FromStates.CommaOr(v => ((Enum)(object)v!).NiceToString()),
+                        ((Enum)(object)state!).NiceToString());
 
                 return base.OnCanExecute(entity);
             }
@@ -233,8 +233,8 @@ public override void AssertIsValid()
         public class Delete : Graph<T>.Delete, IGraphOperation, IGraphFromStatesOperation
         {
             public List<S> FromStates { get; private set; }
-            IEnumerable<Enum> IOperation.UntypedFromStates { get { return FromStates.Cast<Enum>(); } }
-            Type IOperation.StateType { get { return typeof(S); } }
+            IEnumerable<Enum>? IOperation.UntypedFromStates { get { return FromStates.Cast<Enum>(); } }
+            Type? IOperation.StateType { get { return typeof(S); } }
 
             bool IGraphHasFromStatesOperation.HasFromStates
             {
@@ -247,19 +247,19 @@ public Delete(DeleteSymbol<T> symbol)
                 FromStates = new List<S>();
             }
 
-            protected override string OnCanDelete(T entity)
+            protected override string? OnCanDelete(T entity)
             {
                 S state = Graph<T, S>.GetStateFunc(entity);
 
                 if (!FromStates.Contains(state))
                     return OperationMessage.StateShouldBe0InsteadOf1.NiceToString().FormatWith(
-                        FromStates.CommaOr(v => ((Enum)(object)v).NiceToString()),
-                        ((Enum)(object)state).NiceToString());
+                        FromStates.CommaOr(v => ((Enum)(object)v!).NiceToString()),
+                        ((Enum)(object)state!).NiceToString());
 
                 return base.OnCanDelete(entity);
             }
 
-            protected override void OnDelete(T entity, object[] args)
+            protected override void OnDelete(T entity, object[]? args)
             {
                 AssertGetState();
                 S oldState = Graph<T, S>.GetStateFunc(entity);
@@ -309,14 +309,14 @@ public static DirectedEdgedGraph<string, string> ToDirectedGraph()
         {
             DirectedEdgedGraph<string, string> result = new DirectedEdgedGraph<string, string>();
 
-            Action<string, string, OperationSymbol> Add = (from, to, key) =>
-                {
-                    Dictionary<string, string> dic = result.TryRelatedTo(from);
-                    if (dic == null || !dic.ContainsKey(to))
-                        result.Add(from, to, key.ToString());
-                    else
-                        result.Add(from, to, dic[to] + ", " + key.ToString());
-                };
+            void Add(string from, string to, OperationSymbol key)
+            {
+                Dictionary<string, string> dic = result.TryRelatedTo(from);
+                if (dic == null || !dic.ContainsKey(to))
+                    result.Add(from, to, key.ToString());
+                else
+                    result.Add(from, to, dic[to] + ", " + key.ToString());
+            }
 
             foreach (var item in OperationLogic.GraphOperations<T, S>())
             {
@@ -328,7 +328,7 @@ public static DirectedEdgedGraph<string, string> ToDirectedGraph()
 
                             foreach (var f in gOp.FromStates)
                                 foreach (var t in gOp.ToStates)
-                                    Add(f.ToString(), t.ToString(), item.OperationSymbol);
+                                    Add(f!.ToString(), t!.ToString(), item.OperationSymbol);
 
 
                         } break;
@@ -336,7 +336,7 @@ public static DirectedEdgedGraph<string, string> ToDirectedGraph()
                         {
                             Delete dOp = (Delete)item;
                             foreach (var f in dOp.FromStates)
-                                Add(f.ToString(), "[Deleted]", item.OperationSymbol);
+                                Add(f!.ToString(), "[Deleted]", item.OperationSymbol);
 
 
                         } break;
@@ -350,7 +350,7 @@ public static DirectedEdgedGraph<string, string> ToDirectedGraph()
 
                             var dtoState = (IGraphToStateOperation)item;
                             foreach (var t in dtoState.ToStates)
-                                Add(from, t.ToString(), item.OperationSymbol);
+                                Add(from, t!.ToString(), item.OperationSymbol);
 
                         } break;
                 }
diff --git a/Signum.Engine/Operations/Internal.cs b/Signum.Engine/Operations/Internal.cs
index 2b33615bf0..43efb2817d 100644
--- a/Signum.Engine/Operations/Internal.cs
+++ b/Signum.Engine/Operations/Internal.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using Signum.Entities;
 
@@ -6,48 +6,48 @@ namespace Signum.Engine.Operations.Internal
 {
     public interface IConstructOperation : IOperation
     {
-        IEntity Construct(params object[] parameters);
+        IEntity Construct(params object[]? parameters);
     }
 
     public interface IConstructorFromOperation : IEntityOperation
     {
-        IEntity Construct(IEntity entity, params object[] parameters);
+        IEntity Construct(IEntity entity, params object[]? parameters);
     }
 
     public interface IConstructorFromManyOperation : IOperation
     {
-        IEntity Construct(IEnumerable<Lite<IEntity>> lites, params object[] parameters);
+        IEntity Construct(IEnumerable<Lite<IEntity>> lites, params object[]? parameters);
 
         Type BaseType { get; }
     }
 
     public interface IExecuteOperation : IEntityOperation
     {
-        void Execute(IEntity entity, params object[] parameters);
+        void Execute(IEntity entity, params object[]? parameters);
     }
 
     public interface IDeleteOperation : IEntityOperation
     {
-        void Delete(IEntity entity, params object[] parameters);
+        void Delete(IEntity entity, params object[]? parameters);
     }
 
     //The only point of this clases is to avoid 'member names cannot be the same as their enclosing type' compilation message
     public class _Construct<T>
         where T : class, IEntity
     {
-        public Func<object[], T> Construct { get; set; }
+        public Func<object[]?, T> Construct { get; set; } = null!;
     }
 
     public class _Execute<T>
         where T : class, IEntity
     {
-        public Action<T, object[]> Execute { get; set; }
+        public Action<T, object[]?> Execute { get; set; } = null!;
     }
 
 
     public class _Delete<T>
       where T : class, IEntity
     {
-        public Action<T, object[]> Delete { get; set; }
+        public Action<T, object[]?> Delete { get; set; } = null!;
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Engine/Operations/OperationLogic.cs b/Signum.Engine/Operations/OperationLogic.cs
index e16a3d9035..2bac7068ac 100644
--- a/Signum.Engine/Operations/OperationLogic.cs
+++ b/Signum.Engine/Operations/OperationLogic.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -86,7 +86,7 @@ public static IDisposable AllowSave(Type type)
 
         public static void AssertStarted(SchemaBuilder sb)
         {
-            sb.AssertDefined(ReflectionTools.GetMethodInfo(() => Start(null)));
+            sb.AssertDefined(ReflectionTools.GetMethodInfo(() => Start(null!)));
         }
 
         public static void Start(SchemaBuilder sb)
@@ -221,12 +221,12 @@ static void EntityEventsGlobal_Saving(Entity ident)
         public static event SurroundOperationHandler SurroundOperation;
         public static event AllowOperationHandler AllowOperation;
 
-        internal static IDisposable OnSuroundOperation(IOperation operation, OperationLogEntity log, IEntity entity, object[] args)
+        internal static IDisposable? OnSuroundOperation(IOperation operation, OperationLogEntity log, IEntity? entity, object[]? args)
         {
-            return Disposable.Combine(SurroundOperation, f => f(operation, log, (Entity)entity, args));
+            return Disposable.Combine(SurroundOperation, f => f(operation, log, (Entity?)entity, args));
         }
 
-        internal static void SetExceptionData(Exception ex, OperationSymbol operationSymbol, IEntity entity, object[] args)
+        internal static void SetExceptionData(Exception ex, OperationSymbol operationSymbol, IEntity? entity, object[]? args)
         {
             ex.Data["operation"] = operationSymbol;
             ex.Data["entity"] = entity;
@@ -316,12 +316,10 @@ public static IEnumerable<OperationSymbol> AllSymbols()
 
         private static OperationInfo ToOperationInfo(IOperation oper)
         {
-            return new OperationInfo
+            return new OperationInfo(oper.OperationSymbol, oper.OperationType)
             {
-                OperationSymbol = oper.OperationSymbol,
                 CanBeModified = (oper as IEntityOperation)?.CanBeModified,
                 Returns = oper.Returns,
-                OperationType = oper.OperationType,
                 ReturnType = oper.ReturnType,
                 HasStates = (oper as IGraphHasFromStatesOperation)?.HasFromStates,
                 HasCanExecute = (oper as IEntityOperation)?.HasCanExecute,
@@ -350,7 +348,7 @@ public static Dictionary<OperationSymbol, string> ServiceCanExecute(Entity entit
 
 
         #region Execute
-        public static T Execute<T>(this T entity, ExecuteSymbol<T> symbol, params object[] args)
+        public static T Execute<T>(this T entity, ExecuteSymbol<T> symbol, params object[]? args)
             where T : class, IEntity
         {
             var op = Find<IExecuteOperation>(entity.GetType(), symbol.Symbol).AssertEntity((Entity)(IEntity)entity);
@@ -358,14 +356,14 @@ public static T Execute<T>(this T entity, ExecuteSymbol<T> symbol, params object
             return (T)(IEntity)entity;
         }
 
-        public static Entity ServiceExecute(IEntity entity, OperationSymbol operationSymbol, params object[] args)
+        public static Entity ServiceExecute(IEntity entity, OperationSymbol operationSymbol, params object[]? args)
         {
             var op = Find<IExecuteOperation>(entity.GetType(), operationSymbol).AssertEntity((Entity)(IEntity)entity);
             op.Execute(entity, args);
             return (Entity)(IEntity)entity;
         }
 
-        public static T ExecuteLite<T>(this Lite<T> lite, ExecuteSymbol<T> symbol, params object[] args)
+        public static T ExecuteLite<T>(this Lite<T> lite, ExecuteSymbol<T> symbol, params object[]? args)
             where T : class, IEntity
         {
             T entity = lite.RetrieveAndForget();
@@ -374,7 +372,7 @@ public static T ExecuteLite<T>(this Lite<T> lite, ExecuteSymbol<T> symbol, param
             return entity;
         }
 
-        public static Entity ServiceExecuteLite(Lite<IEntity> lite, OperationSymbol operationSymbol, params object[] args)
+        public static Entity ServiceExecuteLite(Lite<IEntity> lite, OperationSymbol operationSymbol, params object[]? args)
         {
             Entity entity = (Entity)lite.RetrieveAndForget();
             var op = Find<IExecuteOperation>(lite.EntityType, operationSymbol);
@@ -383,14 +381,14 @@ public static Entity ServiceExecuteLite(Lite<IEntity> lite, OperationSymbol oper
         }
 
 
-        public static string CanExecute<T>(this T entity, IEntityOperationSymbolContainer<T> symbol)
+        public static string? CanExecute<T>(this T entity, IEntityOperationSymbolContainer<T> symbol)
             where T : class, IEntity
         {
             var op = Find<IEntityOperation>(entity.GetType(), symbol.Symbol);
             return op.CanExecute(entity);
         }
 
-        public static string ServiceCanExecute(Entity entity, OperationSymbol operationSymbol)
+        public static string? ServiceCanExecute(Entity entity, OperationSymbol operationSymbol)
         {
             var op = Find<IEntityOperation>(entity.GetType(), operationSymbol);
             return op.CanExecute(entity);
@@ -399,7 +397,7 @@ public static string ServiceCanExecute(Entity entity, OperationSymbol operationS
 
         #region Delete
 
-        public static void DeleteLite<T>(this Lite<T> lite, DeleteSymbol<T> symbol, params object[] args)
+        public static void DeleteLite<T>(this Lite<T> lite, DeleteSymbol<T> symbol, params object[]? args)
             where T : class, IEntity
         {
             IEntity entity = lite.RetrieveAndForget();
@@ -407,21 +405,21 @@ public static void DeleteLite<T>(this Lite<T> lite, DeleteSymbol<T> symbol, para
             op.Delete(entity, args);
         }
 
-        public static void ServiceDelete(Lite<IEntity> lite, OperationSymbol operationSymbol, params object[] args)
+        public static void ServiceDelete(Lite<IEntity> lite, OperationSymbol operationSymbol, params object[]? args)
         {
             IEntity entity = lite.RetrieveAndForget();
             var op = Find<IDeleteOperation>(lite.EntityType, operationSymbol);
             op.Delete(entity, args);
         }
 
-        public static void Delete<T>(this T entity, DeleteSymbol<T> symbol, params object[] args)
+        public static void Delete<T>(this T entity, DeleteSymbol<T> symbol, params object[]? args)
             where T : class, IEntity
         {
             var op = Find<IDeleteOperation>(entity.GetType(), symbol.Symbol).AssertEntity((Entity)(IEntity)entity);
             op.Delete(entity, args);
         }
 
-        public static void ServiceDelete(Entity entity, OperationSymbol operationSymbol, params object[] args)
+        public static void ServiceDelete(Entity entity, OperationSymbol operationSymbol, params object[]? args)
         {
             var op = Find<IDeleteOperation>(entity.GetType(), operationSymbol).AssertEntity((Entity)(IEntity)entity);
             op.Delete(entity, args);
@@ -429,13 +427,13 @@ public static void ServiceDelete(Entity entity, OperationSymbol operationSymbol,
         #endregion
 
         #region Construct
-        public static Entity ServiceConstruct(Type type, OperationSymbol operationSymbol, params object[] args)
+        public static Entity ServiceConstruct(Type type, OperationSymbol operationSymbol, params object[]? args)
         {
             var op = Find<IConstructOperation>(type, operationSymbol);
             return (Entity)op.Construct(args);
         }
 
-        public static T Construct<T>(ConstructSymbol<T>.Simple symbol, params object[] args)
+        public static T Construct<T>(ConstructSymbol<T>.Simple symbol, params object[]? args)
             where T : class, IEntity
         {
             var op = Find<IConstructOperation>(typeof(T), symbol.Symbol);
@@ -445,7 +443,7 @@ public static T Construct<T>(ConstructSymbol<T>.Simple symbol, params object[] a
 
         #region ConstructFrom
 
-        public static T ConstructFrom<F, T>(this F entity, ConstructSymbol<T>.From<F> symbol, params object[] args)
+        public static T ConstructFrom<F, T>(this F entity, ConstructSymbol<T>.From<F> symbol, params object[]? args)
             where T : class, IEntity
             where F : class, IEntity
         {
@@ -453,13 +451,13 @@ public static T ConstructFrom<F, T>(this F entity, ConstructSymbol<T>.From<F> sy
             return (T)op.Construct(entity, args);
         }
 
-        public static Entity ServiceConstructFrom(IEntity entity, OperationSymbol operationSymbol, params object[] args)
+        public static Entity ServiceConstructFrom(IEntity entity, OperationSymbol operationSymbol, params object[]? args)
         {
             var op = Find<IConstructorFromOperation>(entity.GetType(), operationSymbol).AssertEntity((Entity)(object)entity);
             return (Entity)op.Construct(entity, args);
         }
 
-        public static T ConstructFromLite<F, T>(this Lite<F> lite, ConstructSymbol<T>.From<F> symbol, params object[] args)
+        public static T ConstructFromLite<F, T>(this Lite<F> lite, ConstructSymbol<T>.From<F> symbol, params object[]? args)
             where T : class, IEntity
             where F : class, IEntity
         {
@@ -467,7 +465,7 @@ public static T ConstructFromLite<F, T>(this Lite<F> lite, ConstructSymbol<T>.Fr
             return (T)op.Construct(Database.RetrieveAndForget(lite), args);
         }
 
-        public static Entity ServiceConstructFromLite(Lite<IEntity> lite, OperationSymbol operationSymbol, params object[] args)
+        public static Entity ServiceConstructFromLite(Lite<IEntity> lite, OperationSymbol operationSymbol, params object[]? args)
         {
             var op = Find<IConstructorFromOperation>(lite.EntityType, operationSymbol);
             return (Entity)op.Construct(Database.RetrieveAndForget(lite), args);
@@ -475,14 +473,14 @@ public static Entity ServiceConstructFromLite(Lite<IEntity> lite, OperationSymbo
         #endregion
 
         #region ConstructFromMany
-        public static Entity ServiceConstructFromMany(IEnumerable<Lite<IEntity>> lites, Type type, OperationSymbol operationSymbol, params object[] args)
+        public static Entity ServiceConstructFromMany(IEnumerable<Lite<IEntity>> lites, Type type, OperationSymbol operationSymbol, params object[]? args)
         {
             var onlyType = lites.Select(a => a.EntityType).Distinct().Only();
 
             return (Entity)Find<IConstructorFromManyOperation>(onlyType ?? type, operationSymbol).Construct(lites, args);
         }
 
-        public static T ConstructFromMany<F, T>(List<Lite<F>> lites, ConstructSymbol<T>.FromMany<F> symbol, params object[] args)
+        public static T ConstructFromMany<F, T>(List<Lite<F>> lites, ConstructSymbol<T>.FromMany<F> symbol, params object[]? args)
             where T : class, IEntity
             where F : class, IEntity
         {
@@ -510,13 +508,13 @@ public static T Find<T>(Type type, OperationSymbol operationSymbol)
 
         public static IOperation FindOperation(Type type, OperationSymbol operationSymbol)
         {
-            IOperation result = TryFindOperation(type, operationSymbol);
+            IOperation? result = TryFindOperation(type, operationSymbol);
             if (result == null)
                 throw new InvalidOperationException("Operation '{0}' not found for type {1}".FormatWith(operationSymbol, type));
             return result;
         }
 
-        public static IOperation TryFindOperation(Type type, OperationSymbol operationSymbol)
+        public static IOperation? TryFindOperation(Type type, OperationSymbol operationSymbol)
         {
             return operations.TryGetValue(type.CleanType())?.TryGetC(operationSymbol);
         }
@@ -603,7 +601,7 @@ select FindOperation(kvp.Value.FirstEx(), kvp.Key) into op
             return typeOperations.Concat(returnTypeOperations);
         }
 
-        public static string InState<T>(this T state, params T[] fromStates) where T : struct
+        public static string? InState<T>(this T state, params T[] fromStates) where T : struct
         {
             if (!fromStates.Contains(state))
                 return OperationMessage.StateShouldBe0InsteadOf1.NiceToString().FormatWith(
@@ -637,9 +635,9 @@ public static OperationType OperationType(Type type, OperationSymbol operationSy
             return FindOperation(type, operationSymbol).OperationType;
         }
 
-        public static Dictionary<OperationSymbol, string> GetContextualCanExecute(IEnumerable<Lite<IEntity>> lites, List<OperationSymbol> operationSymbols)
+        public static Dictionary<OperationSymbol, string>? GetContextualCanExecute(IEnumerable<Lite<IEntity>> lites, List<OperationSymbol> operationSymbols)
         {
-            Dictionary<OperationSymbol, string> result = null;
+            Dictionary<OperationSymbol, string>? result = null;
             using (ExecutionMode.Global())
             {
                 foreach (var grLites in lites.GroupBy(a => a.EntityType))
@@ -724,7 +722,7 @@ public static FluentInclude<T> WithDelete<T>(this FluentInclude<T> fi, DeleteSym
             return fi;
         }
 
-        public static FluentInclude<T> WithConstruct<T>(this FluentInclude<T> fi, ConstructSymbol<T>.Simple construct, Func<object[], T> constructFunction)
+        public static FluentInclude<T> WithConstruct<T>(this FluentInclude<T> fi, ConstructSymbol<T>.Simple construct, Func<object[]?, T> constructFunction)
                where T : Entity
         {
             new Graph<T>.Construct(construct)
@@ -751,25 +749,25 @@ public interface IOperation
         Type OverridenType { get; }
         OperationType OperationType { get; }
         bool Returns { get; }
-        Type ReturnType { get; }
+        Type? ReturnType { get; }
         void AssertIsValid();
 
-        IEnumerable<Enum> UntypedFromStates { get; }
-        IEnumerable<Enum> UntypedToStates { get; }
-        Type StateType { get; }
+        IEnumerable<Enum>? UntypedFromStates { get; }
+        IEnumerable<Enum>? UntypedToStates { get; }
+        Type? StateType { get; }
     }
 
     public interface IEntityOperation : IOperation
     {
         bool CanBeModified { get; }
         bool CanBeNew { get; }
-        string CanExecute(IEntity entity);
+        string? CanExecute(IEntity entity);
         bool HasCanExecute { get; }
         Type BaseType { get; }
     }
 
 
-    public delegate IDisposable SurroundOperationHandler(IOperation operation, OperationLogEntity log, Entity entity, object[] args);
+    public delegate IDisposable SurroundOperationHandler(IOperation operation, OperationLogEntity log, Entity? entity, object[]? args);
     public delegate void OperationHandler(IOperation operation, Entity entity);
     public delegate void ErrorOperationHandler(IOperation operation, Entity entity, Exception ex);
     public delegate bool AllowOperationHandler(OperationSymbol operationSymbol, Type entityType, bool inUserInterface);
diff --git a/Signum.Engine/Patterns/DeletePart.cs b/Signum.Engine/Patterns/DeletePart.cs
index 6bc4dce864..2e31ad37ef 100644
--- a/Signum.Engine/Patterns/DeletePart.cs
+++ b/Signum.Engine/Patterns/DeletePart.cs
@@ -1,4 +1,4 @@
-using Signum.Engine.Maps;
+using Signum.Engine.Maps;
 using Signum.Entities;
 using Signum.Utilities;
 using Signum.Utilities.DataStructures;
@@ -10,12 +10,12 @@ namespace Signum.Engine
 {
     public static class DeletePart
     {
-        static readonly Variable<ImmutableStack<Type>> avoidTypes = Statics.ThreadVariable<ImmutableStack<Type>>("avoidDeletePart");
-
+        static readonly Variable<ImmutableStack<Type/*?*/>> avoidTypes = Statics.ThreadVariable<ImmutableStack<Type>>("avoidDeletePart"); /*CSBUG*/ 
+ 
         public static bool ShouldAvoidDeletePart(Type partType)
         {
             var stack = avoidTypes.Value;
-            return stack != null && (stack.Contains(partType) || stack.Contains(null));
+            return stack != null && (stack.Contains(partType) || stack.Contains(null!));
         }
 
         /// <param name="partType">Use null for every type</param>
diff --git a/Signum.Engine/Retriever.cs b/Signum.Engine/Retriever.cs
index e02f739424..77873335d0 100644
--- a/Signum.Engine/Retriever.cs
+++ b/Signum.Engine/Retriever.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Entities;
@@ -16,12 +16,12 @@ public interface IRetriever : IDisposable
     {
         Dictionary<string, object> GetUserData();
 
-        T Complete<T>(PrimaryKey? id, Action<T> complete) where T : Entity;
-        T Request<T>(PrimaryKey? id) where T : Entity;
-        T RequestIBA<T>(PrimaryKey? typeId, string id) where T : class, IEntity;
-        Lite<T> RequestLite<T>(Lite<T> lite) where T : class, IEntity;
-        T ModifiablePostRetrieving<T>(T entity) where T : Modifiable;
-        IRetriever Parent { get; }
+        T? Complete<T>(PrimaryKey? id, Action<T> complete) where T : Entity;
+        T? Request<T>(PrimaryKey? id) where T : Entity;
+        T? RequestIBA<T>(PrimaryKey? typeId, string id) where T : class, IEntity;
+        Lite<T>? RequestLite<T>(Lite<T>? lite) where T : class, IEntity;
+        T? ModifiablePostRetrieving<T>(T? entity) where T : Modifiable;
+        IRetriever? Parent { get; }
 
         void CompleteAll();
         Task CompleteAllAsync(CancellationToken token);
@@ -31,10 +31,10 @@ public interface IRetriever : IDisposable
 
     class RealRetriever : IRetriever
     {
-        Dictionary<string, object> userData;
+        Dictionary<string, object>? userData;
         public Dictionary<string, object> GetUserData() => userData ?? (userData = new Dictionary<string, object>());
 
-        public IRetriever Parent
+        public IRetriever? Parent
         {
             get { return null; }
         }
@@ -46,8 +46,8 @@ public RealRetriever(EntityCache.RealEntityCache entityCache)
 
         EntityCache.RealEntityCache entityCache;
         Dictionary<(Type type, PrimaryKey id), Entity> retrieved = new Dictionary<(Type type, PrimaryKey id), Entity>();
-        Dictionary<Type, Dictionary<PrimaryKey, Entity>> requests;
-        Dictionary<(Type type, PrimaryKey id), List<Lite<IEntity>>> liteRequests;
+        Dictionary<Type, Dictionary<PrimaryKey, Entity>>? requests;
+        Dictionary<(Type type, PrimaryKey id), List<Lite<IEntity>>>? liteRequests;
         List<Modifiable> modifiablePostRetrieving = new List<Modifiable>();
 
         bool TryGetRequest((Type type, PrimaryKey id) key, out Entity value)
@@ -55,11 +55,11 @@ bool TryGetRequest((Type type, PrimaryKey id) key, out Entity value)
             if (requests != null && requests.TryGetValue(key.type, out Dictionary<PrimaryKey, Entity> dic) && dic.TryGetValue(key.id, out value))
                 return true;
 
-            value = null;
+            value = null!;
             return false;
         }
 
-        public T Complete<T>(PrimaryKey? id, Action<T> complete) where T : Entity
+        public T? Complete<T>(PrimaryKey? id, Action<T> complete) where T : Entity
         {
             if (id == null)
                 return null;
@@ -76,7 +76,7 @@ public T Complete<T>(PrimaryKey? id, Action<T> complete) where T : Entity
             if (TryGetRequest(tuple, out result))
             {
                 entity = (T)result;
-                requests[typeof(T)].Remove(id.Value);
+                requests![typeof(T)].Remove(id.Value);
             }
             else
             {
@@ -91,20 +91,20 @@ public T Complete<T>(PrimaryKey? id, Action<T> complete) where T : Entity
 
         static GenericInvoker<Func<RealRetriever, PrimaryKey?, Entity>> giRequest =
             new GenericInvoker<Func<RealRetriever, PrimaryKey?, Entity>>((rr, id) => rr.Request<Entity>(id));
-        public T Request<T>(PrimaryKey? id) where T : Entity
+        public T? Request<T>(PrimaryKey? id) where T : Entity
         {
             if (id == null)
                 return null;
 
             var tuple = (type: typeof(T), id: id.Value);
 
-            if (entityCache.TryGetValue(tuple, out Entity ident))
+            if (entityCache.TryGetValue(tuple, out Entity? ident))
                 return (T)ident;
 
             if (retrieved.TryGetValue(tuple, out ident))
                 return (T)ident;
 
-            ICacheController cc = Schema.Current.CacheController(typeof(T));
+            ICacheController? cc = Schema.Current.CacheController(typeof(T));
             if (cc != null && cc.Enabled)
             {
                 T entityFromCache = EntityCache.Construct<T>(id.Value);
@@ -113,7 +113,7 @@ public T Request<T>(PrimaryKey? id) where T : Entity
                 return entityFromCache;
             }
 
-            ident = (T)requests?.TryGetC(typeof(T))?.TryGetC(id.Value);
+            ident = (T?)requests?.TryGetC(typeof(T))?.TryGetC(id.Value);
             if (ident != null)
                 return (T)ident;
 
@@ -126,7 +126,7 @@ public T Request<T>(PrimaryKey? id) where T : Entity
             return entity;
         }
 
-        public T RequestIBA<T>(PrimaryKey? typeId, string id) where T : class, IEntity
+        public T? RequestIBA<T>(PrimaryKey? typeId, string id) where T : class, IEntity
         {
             if (id == null)
                 return null;
@@ -138,12 +138,12 @@ public T RequestIBA<T>(PrimaryKey? typeId, string id) where T : class, IEntity
             return (T)(IEntity)giRequest.GetInvoker(type)(this, parsedId);
         }
 
-        public Lite<T> RequestLite<T>(Lite<T> lite) where T : class, IEntity
+        public Lite<T>? RequestLite<T>(Lite<T>? lite) where T : class, IEntity
         {
             if (lite == null)
                 return null;
 
-            ICacheController cc = Schema.Current.CacheController(lite.EntityType);
+            ICacheController? cc = Schema.Current.CacheController(lite.EntityType);
             if (cc != null && cc.Enabled)
             {
                 lite.SetToString(cc.TryGetToString(lite.Id) ?? ("[" + EngineMessage.EntityWithType0AndId1NotFound.NiceToString().FormatWith(lite.EntityType.NiceName(), lite.Id) + "]"));
@@ -157,7 +157,7 @@ public Lite<T> RequestLite<T>(Lite<T> lite) where T : class, IEntity
             return lite;
         }
 
-        public T ModifiablePostRetrieving<T>(T modifiable) where T : Modifiable
+        public T? ModifiablePostRetrieving<T>(T? modifiable) where T : Modifiable
         {
             if (modifiable != null)
                 modifiablePostRetrieving.Add(modifiable);
@@ -190,8 +190,8 @@ public async Task CompleteAllPrivate(CancellationToken? token)
                     var group = requests.WithMax(a => a.Value.Count);
 
                     var dic = group.Value;
-                    ICacheController cc = Schema.Current.CacheController(group.Key);
 
+                    ICacheController? cc = Schema.Current.CacheController(group.Key);
                     if (cc != null && cc.Enabled)
                     {
                         cc.Load();
@@ -223,7 +223,7 @@ public async Task CompleteAllPrivate(CancellationToken? token)
             {
 
                 {
-                    List<(Type type, PrimaryKey id)> toRemove = null;
+                    List<(Type type, PrimaryKey id)>? toRemove = null;
                     foreach (var item in liteRequests)
                     {
                         var entity = retrieved.TryGetC(item.Key);
@@ -303,8 +303,7 @@ public async Task CompleteAllPrivate(CancellationToken? token)
             new GenericInvoker<Func<List<PrimaryKey>, CancellationToken?, Task<Dictionary<PrimaryKey, string>>>>((ids, token) => GetStrings<Entity>(ids, token));
         static async Task<Dictionary<PrimaryKey, string>> GetStrings<T>(List<PrimaryKey> ids, CancellationToken? token) where T : Entity
         {
-            ICacheController cc = Schema.Current.CacheController(typeof(T));
-
+            ICacheController? cc = Schema.Current.CacheController(typeof(T));
             if (cc != null && cc.Enabled)
             {
                 cc.Load();
@@ -344,39 +343,40 @@ public ModifiedState ModifiedState
 
     class ChildRetriever : IRetriever
     {
-        public Dictionary<string, object> GetUserData() => this.Parent.GetUserData();
+        public Dictionary<string, object> GetUserData() => this.parent.GetUserData();
 
         EntityCache.RealEntityCache entityCache;
-        public IRetriever Parent { get; set; }
+        public IRetriever parent;
+        public IRetriever? Parent => parent;
         public ChildRetriever(IRetriever parent, EntityCache.RealEntityCache entityCache)
         {
-            this.Parent = parent;
+            this.parent= parent;
             this.entityCache = entityCache;
         }
 
-        public T Complete<T>(PrimaryKey? id, Action<T> complete) where T : Entity
+        public T? Complete<T>(PrimaryKey? id, Action<T> complete) where T : Entity
         {
-            return Parent.Complete<T>(id, complete);
+            return parent.Complete<T>(id, complete);
         }
 
-        public T Request<T>(PrimaryKey? id) where T : Entity
+        public T? Request<T>(PrimaryKey? id) where T : Entity
         {
-            return Parent.Request<T>(id);
+            return parent.Request<T>(id);
         }
 
-        public T RequestIBA<T>(PrimaryKey? typeId, string id) where T : class, IEntity
+        public T? RequestIBA<T>(PrimaryKey? typeId, string id) where T : class, IEntity
         {
-            return Parent.RequestIBA<T>(typeId, id);
+            return parent.RequestIBA<T>(typeId, id);
         }
 
-        public Lite<T> RequestLite<T>(Lite<T> lite) where T : class, IEntity
+        public Lite<T>? RequestLite<T>(Lite<T>? lite) where T : class, IEntity
         {
-            return Parent.RequestLite<T>(lite);
+            return parent.RequestLite<T>(lite);
         }
 
-        public T ModifiablePostRetrieving<T>(T entity) where T : Modifiable
+        public T? ModifiablePostRetrieving<T>(T? entity) where T : Modifiable
         {
-            return Parent.ModifiablePostRetrieving(entity);
+            return parent.ModifiablePostRetrieving(entity);
         }
 
         public void CompleteAll()
diff --git a/Signum.Engine/Schema/Schema.Expressions.cs b/Signum.Engine/Schema/Schema.Expressions.cs
index 6ee7a3fef5..78861c1f8b 100644
--- a/Signum.Engine/Schema/Schema.Expressions.cs
+++ b/Signum.Engine/Schema/Schema.Expressions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
@@ -18,7 +18,7 @@ public partial class Table
     {
         internal Expression GetProjectorExpression(Alias tableAlias, QueryBinder binder)
         {
-            Expression id = GetIdExpression(tableAlias);
+            Expression? id = GetIdExpression(tableAlias);
 
             if (IsView)
             {
@@ -33,10 +33,10 @@ internal Expression GetProjectorExpression(Alias tableAlias, QueryBinder binder)
                 Schema.Current.AssertAllowed(Type, inUserInterface: false);
 
                 var period = GenerateSystemPeriod(tableAlias, binder);
-                var bindings = GenerateBindings(tableAlias, binder, id, period);
-                var mixins = GenerateMixins(tableAlias, binder, id, period);
+                var bindings = GenerateBindings(tableAlias, binder, id!, period);
+                var mixins = GenerateMixins(tableAlias, binder, id!, period);
 
-                var result = new EntityExpression(this.Type, (PrimaryKeyExpression)id, period, tableAlias, bindings, mixins, period, avoidExpandOnRetrieving: false);
+                var result = new EntityExpression(this.Type, (PrimaryKeyExpression)id!, period, tableAlias, bindings, mixins, period, avoidExpandOnRetrieving: false);
 
                 return result;
             }
@@ -44,7 +44,7 @@ internal Expression GetProjectorExpression(Alias tableAlias, QueryBinder binder)
 
         internal static ConstructorInfo intervalConstructor = typeof(Interval<DateTime>).GetConstructor(new[] { typeof(DateTime), typeof(DateTime) });
 
-        internal NewExpression GenerateSystemPeriod(Alias tableAlias, QueryBinder binder, bool force = false)
+        internal NewExpression? GenerateSystemPeriod(Alias tableAlias, QueryBinder binder, bool force = false)
         {
             return this.SystemVersioned != null && (force || binder.systemTime is SystemTime.Interval) ? Expression.New(intervalConstructor,
                 new ColumnExpression(typeof(DateTime), tableAlias, this.SystemVersioned.StartColumnName),
@@ -52,11 +52,12 @@ internal NewExpression GenerateSystemPeriod(Alias tableAlias, QueryBinder binder
             ) : null;
         }
 
-        internal ReadOnlyCollection<FieldBinding> GenerateBindings(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal ReadOnlyCollection<FieldBinding> GenerateBindings(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
-            List<FieldBinding> result = new List<FieldBinding>();
-
-           result.Add(new FieldBinding(Table.fiId, id));
+            List<FieldBinding> result = new List<FieldBinding>
+            {
+                new FieldBinding(Table.fiId, id)
+            };
 
             foreach (var ef in this.Fields.Values)
             {
@@ -72,7 +73,7 @@ internal ReadOnlyCollection<FieldBinding> GenerateBindings(Alias tableAlias, Que
             return result.ToReadOnly();
         }
 
-        internal ReadOnlyCollection<MixinEntityExpression> GenerateMixins(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal ReadOnlyCollection<MixinEntityExpression>? GenerateMixins(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
             if (this.Mixins == null)
                 return null;
@@ -81,7 +82,7 @@ internal ReadOnlyCollection<MixinEntityExpression> GenerateMixins(Alias tableAli
         }
 
 
-        internal Expression GetIdExpression(Alias alias)
+        internal Expression? GetIdExpression(Alias alias)
         {
             var field = Fields.TryGetC(Table.fiId.Name);
 
@@ -95,10 +96,10 @@ internal Expression GetIdExpression(Alias alias)
                     return new ColumnExpression(Signum.Entities.PrimaryKey.Type(fr.ReferenceTable.Type).Nullify(), alias, fr.Name);
             }
 
-            return field.Field.GetExpression(alias, null, null, null);
+            return field.Field!.GetExpression(alias, null!, null!, null);
         }
 
-        public EntityField GetViewPrimaryKey()
+        public EntityField? GetViewPrimaryKey()
         {
             return Fields.Values.FirstOrDefault(f => f.Field is IColumn && ((IColumn)f.Field).PrimaryKey);
         }
@@ -108,8 +109,8 @@ ColumnExpression ITablePrivate.GetPrimaryOrder(Alias alias)
             var res = GetIdExpression(alias);
 
             return res is PrimaryKeyExpression ?
-                (ColumnExpression)((PrimaryKeyExpression)res).Value:
-                (ColumnExpression)res;
+                (ColumnExpression)((PrimaryKeyExpression)res!).Value : /*CSBUG*/
+                (ColumnExpression)res!;
         }
     }
 
@@ -129,10 +130,10 @@ internal PrimaryKeyExpression BackColumnExpression(Alias tableAlias)
 
         internal ColumnExpression OrderExpression(Alias tableAlias)
         {
-            return new ColumnExpression(typeof(int), tableAlias, ((IColumn)this.Order).Name);
+            return new ColumnExpression(typeof(int), tableAlias, ((IColumn)this.Order!).Name);
         }
 
-        internal Expression FieldExpression(Alias tableAlias, QueryBinder binder, NewExpression externalPeriod, bool withRowId)
+        internal Expression FieldExpression(Alias tableAlias, QueryBinder binder, NewExpression? externalPeriod, bool withRowId)
         {
             var rowId = RowIdExpression(tableAlias);
 
@@ -157,11 +158,11 @@ internal Expression GetProjectorExpression(Alias tableAlias, QueryBinder binder)
             Type elementType = typeof(MListElement<,>).MakeGenericType(BackReference.FieldType, Field.FieldType);
 
             var rowId = RowIdExpression(tableAlias);
-            NewExpression period = GenerateSystemPeriod(tableAlias, binder);
+            NewExpression? period = GenerateSystemPeriod(tableAlias, binder);
 
             return new MListElementExpression(
                 rowId,
-                (EntityExpression)this.BackReference.GetExpression(tableAlias, binder, null, period),
+                (EntityExpression)this.BackReference.GetExpression(tableAlias, binder, null!, period),
                 this.Order == null ? null : OrderExpression(tableAlias),
                 this.Field.GetExpression(tableAlias, binder, rowId, period),
                 period,
@@ -169,9 +170,9 @@ internal Expression GetProjectorExpression(Alias tableAlias, QueryBinder binder)
                 tableAlias);
         }
 
-        internal NewExpression GenerateSystemPeriod(Alias tableAlias, QueryBinder binder, bool force = false)
+        internal NewExpression? GenerateSystemPeriod(Alias tableAlias, QueryBinder binder, bool force = false)
         {
-            return this.SystemVersioned != null || (force || binder.systemTime is SystemTime.Interval) ? Expression.New(Table.intervalConstructor,
+            return this.SystemVersioned != null && (force || binder.systemTime is SystemTime.Interval) ? Expression.New(Table.intervalConstructor,
                 new ColumnExpression(typeof(DateTime), tableAlias, this.SystemVersioned.StartColumnName),
                 new ColumnExpression(typeof(DateTime), tableAlias, this.SystemVersioned.EndColumnName)
             ) : null;
@@ -185,12 +186,12 @@ ColumnExpression ITablePrivate.GetPrimaryOrder(Alias alias)
 
     public abstract partial class Field
     {
-        internal abstract Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period);
+        internal abstract Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period);
     }
 
     public partial class FieldPrimaryKey
     {
-        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
             return new PrimaryKeyExpression(new ColumnExpression(this.Type.Nullify(), tableAlias, this.Name).Nullify());
         }
@@ -198,7 +199,7 @@ internal override Expression GetExpression(Alias tableAlias, QueryBinder binder,
 
     public partial class FieldValue
     {
-        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
             var column = new ColumnExpression(this.Type, tableAlias, this.Name);
 
@@ -213,7 +214,7 @@ public partial class FieldTicks
     {
         public static readonly PropertyInfo piDateTimeTicks = ReflectionTools.GetPropertyInfo((DateTime d) => d.Ticks);
 
-        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
             if (this.Type == this.FieldType)
                return new ColumnExpression(this.Type, tableAlias, this.Name);
@@ -227,9 +228,9 @@ internal override Expression GetExpression(Alias tableAlias, QueryBinder binder,
 
     public partial class FieldReference
     {
-        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
-            Type cleanType = IsLite ? Lite.Extract(FieldType) : FieldType;
+            Type cleanType = IsLite ? Lite.Extract(FieldType)! : FieldType;
 
             var result = new EntityExpression(cleanType, new PrimaryKeyExpression(new ColumnExpression(this.Type.Nullify(), tableAlias, Name)), period, null, null, null, null, AvoidExpandOnRetrieving);
 
@@ -242,7 +243,7 @@ internal override Expression GetExpression(Alias tableAlias, QueryBinder binder,
 
     public partial class FieldEnum
     {
-        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
             return Expression.Convert(new ColumnExpression(this.Type, tableAlias, Name), FieldType);
         }
@@ -250,7 +251,7 @@ internal override Expression GetExpression(Alias tableAlias, QueryBinder binder,
 
     public partial class FieldMList
     {
-        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
             return new MListExpression(FieldType, (PrimaryKeyExpression)id, period, TableMList); // keep back id empty for some seconds
         }
@@ -258,7 +259,7 @@ internal override Expression GetExpression(Alias tableAlias, QueryBinder binder,
 
     public partial class FieldEmbedded
     {
-        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
             var bindings = (from kvp in EmbeddedFields
                             let fi = kvp.Value.FieldInfo
@@ -276,7 +277,7 @@ internal override Expression GetExpression(Alias tableAlias, QueryBinder binder,
 
     public partial class FieldMixin
     {
-        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
             var bindings = (from kvp in Fields
                             let fi = kvp.Value.FieldInfo
@@ -290,12 +291,12 @@ internal override Expression GetExpression(Alias tableAlias, QueryBinder binder,
 
     public partial class FieldImplementedBy
     {
-        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
             var implementations = ImplementationColumns.SelectDictionary(t => t, (t, ic) =>
                  new EntityExpression(t, new PrimaryKeyExpression(new ColumnExpression(ic.Type.Nullify(), tableAlias, ic.Name)), period, null, null, null, null, AvoidExpandOnRetrieving));
 
-            var result = new ImplementedByExpression(IsLite ? Lite.Extract(FieldType) : FieldType, SplitStrategy, implementations);
+            var result = new ImplementedByExpression(IsLite ? Lite.Extract(FieldType)! : FieldType, SplitStrategy, implementations);
 
             if (this.IsLite)
                 return binder.MakeLite(result, null);
@@ -306,10 +307,10 @@ internal override Expression GetExpression(Alias tableAlias, QueryBinder binder,
 
     public partial class FieldImplementedByAll
     {
-        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression period)
+        internal override Expression GetExpression(Alias tableAlias, QueryBinder binder, Expression id, NewExpression? period)
         {
             Expression result = new ImplementedByAllExpression(
-                IsLite ? Lite.Extract(FieldType) : FieldType,
+                IsLite ? Lite.Extract(FieldType)! : FieldType,
                 new ColumnExpression(Column.Type, tableAlias, Column.Name),
                 new TypeImplementedByAllExpression(new PrimaryKeyExpression(new ColumnExpression(ColumnType.Type.Nullify(), tableAlias, ColumnType.Name))),
                 period);
diff --git a/Signum.Engine/Schema/Schema.Save.cs b/Signum.Engine/Schema/Schema.Save.cs
index 97d3be8376..18ca99ba6b 100644
--- a/Signum.Engine/Schema/Schema.Save.cs
+++ b/Signum.Engine/Schema/Schema.Save.cs
@@ -24,7 +24,7 @@ public Forbidden(HashSet<Entity>? set)
             this.set = set;
         }
 
-        public Forbidden(DirectedGraph<Entity> graph, Entity entity)
+        public Forbidden(DirectedGraph<Entity>? graph, Entity entity)
         {
             this.set = graph?.TryRelatedTo(entity);
         }
@@ -53,7 +53,7 @@ public EntityForbidden(Entity entity, Forbidden forbidden)
             this.Forbidden = forbidden;
         }
 
-        public EntityForbidden(Entity entity, DirectedGraph<Entity> graph)
+        public EntityForbidden(Entity entity, DirectedGraph<Entity>? graph)
         {
             this.Entity = (Entity)entity;
             this.Forbidden = new Forbidden(graph, entity);
@@ -65,7 +65,7 @@ public partial class Table
         ResetLazy<InsertCacheIdentity> inserterIdentity;
         ResetLazy<InsertCacheDisableIdentity> inserterDisableIdentity;
 
-        internal void InsertMany(List<Entity> list, DirectedGraph<Entity> backEdges)
+        internal void InsertMany(List<Entity> list, DirectedGraph<Entity>? backEdges)
         {
             using (HeavyProfiler.LogNoStackTrace("InsertMany", () => this.Type.TypeName()))
             {
@@ -98,8 +98,8 @@ class InsertCacheDisableIdentity
             public Func<string, string> SqlInsertPattern;
             public Func<object /*Entity*/, Forbidden, string, List<DbParameter>> InsertParameters;
 
-            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>> insertDisableIdentityCache =
-                new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>>();
+            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>> insertDisableIdentityCache =
+                new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>>();
 
             public InsertCacheDisableIdentity(Table table, Func<string, string> sqlInsertPattern, Func<object, Forbidden, string, List<DbParameter>> insertParameters)
             {
@@ -108,13 +108,13 @@ public InsertCacheDisableIdentity(Table table, Func<string, string> sqlInsertPat
                 InsertParameters = insertParameters;
             }
 
-            internal Action<List<Entity>, DirectedGraph<Entity>> GetInserter(int numElements)
+            internal Action<List<Entity>, DirectedGraph<Entity>?> GetInserter(int numElements)
             {
                 return insertDisableIdentityCache.GetOrAdd(numElements, (int num) => num == 1 ? GetInsertDisableIdentity() : GetInsertMultiDisableIdentity(num));
             }
 
 
-            Action<List<Entity>, DirectedGraph<Entity>> GetInsertDisableIdentity()
+            Action<List<Entity>, DirectedGraph<Entity>?> GetInsertDisableIdentity()
             {
                 string sqlSingle = SqlInsertPattern("");
 
@@ -140,7 +140,7 @@ Action<List<Entity>, DirectedGraph<Entity>> GetInsertDisableIdentity()
 
 
 
-            Action<List<Entity>, DirectedGraph<Entity>> GetInsertMultiDisableIdentity(int num)
+            Action<List<Entity>, DirectedGraph<Entity>?> GetInsertMultiDisableIdentity(int num)
             {
                 string sqlMulti = Enumerable.Range(0, num).ToString(i => SqlInsertPattern(i.ToString()), ";\r\n");
 
@@ -214,8 +214,8 @@ class InsertCacheIdentity
             public Func<string, bool, string> SqlInsertPattern;
             public Func<Entity, Forbidden, string, List<DbParameter>> InsertParameters;
 
-            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>> insertIdentityCache =
-               new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>>();
+            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>> insertIdentityCache =
+               new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>>();
 
             public InsertCacheIdentity(Table table, Func<string, bool, string> sqlInsertPattern, Func<Entity, Forbidden, string, List<DbParameter>> insertParameters)
             {
@@ -224,12 +224,12 @@ public InsertCacheIdentity(Table table, Func<string, bool, string> sqlInsertPatt
                 InsertParameters = insertParameters;
             }
 
-            internal Action<List<Entity>, DirectedGraph<Entity>> GetInserter(int numElements)
+            internal Action<List<Entity>, DirectedGraph<Entity>?> GetInserter(int numElements)
             {
                 return insertIdentityCache.GetOrAdd(numElements, (int num) => GetInsertMultiIdentity(num));
             }
 
-            Action<List<Entity>, DirectedGraph<Entity>> GetInsertMultiIdentity(int num)
+            Action<List<Entity>, DirectedGraph<Entity>?> GetInsertMultiIdentity(int num)
             {
                 string sqlMulti = new StringBuilder()
                     .AppendLine("DECLARE @MyTable TABLE (Id " + this.table.PrimaryKey.SqlDbType.ToString().ToUpperInvariant() + ");")
@@ -637,7 +637,7 @@ public SqlPreCommand InsertSqlSync(Entity ident, bool includeCollections = true,
             return SqlPreCommand.Combine(Spacing.Simple, declareParent, insert, setParent, collections)!;
         }
 
-        public SqlPreCommand? UpdateSqlSync<T>(T entity, Expression<Func<T, bool>> where, bool includeCollections = true, string? comment = null, string suffix = "")
+        public SqlPreCommand? UpdateSqlSync<T>(T entity, Expression<Func<T, bool>>? where, bool includeCollections = true, string? comment = null, string suffix = "")
             where T : Entity
         {
             if (typeof(T) != Type && where != null)
diff --git a/Signum.Engine/Schema/Schema.cs b/Signum.Engine/Schema/Schema.cs
index ffe4af0a39..aa05fa5380 100644
--- a/Signum.Engine/Schema/Schema.cs
+++ b/Signum.Engine/Schema/Schema.cs
@@ -241,7 +241,7 @@ internal void OnPreBulkInsert(Type type, bool inMListTable)
             return ee.CacheController;
         }
 
-        internal IEnumerable<FieldBinding> GetAdditionalQueryBindings(PropertyRoute parent, PrimaryKeyExpression id, NewExpression period)
+        internal IEnumerable<FieldBinding> GetAdditionalQueryBindings(PropertyRoute parent, PrimaryKeyExpression id, NewExpression? period)
         {
             //AssertAllowed(parent.RootType, inUserInterface: false);
 
diff --git a/Signum.Engine/Schema/SchemaBuilder/NameSequence.cs b/Signum.Engine/Schema/SchemaBuilder/NameSequence.cs
index 91bbca1fbe..cad72bc0d2 100644
--- a/Signum.Engine/Schema/SchemaBuilder/NameSequence.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/NameSequence.cs
@@ -1,11 +1,9 @@
-using Signum.Utilities;
+using Signum.Utilities;
 
 namespace Signum.Engine.Maps
 {
     public class NameSequence
     {
-        private NameSequence() { }
-
         public static readonly NameSequence Void = new VoidNameSequence();
 
         class VoidNameSequence : NameSequence
@@ -19,6 +17,7 @@ public override string ToString()
         readonly string Value;
         readonly NameSequence PreSequence;
 
+        private NameSequence() : this(null!, null!) { }
         private NameSequence(string value, NameSequence preSequence)
         {
             this.Value = value;
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
index 31097591f2..d3f6ad1cf6 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
@@ -496,7 +496,7 @@ public enum KindOfField
             if (route.FieldInfo != null && ReflectionTools.FieldEquals(route.FieldInfo, fiTicks))
                 return KindOfField.Ticks;
 
-            if (Settings.GetSqlDbType(Settings.FieldAttribute<SqlDbTypeAttribute>(route), route.Type) != null)
+            if (Settings.TryGetSqlDbType(Settings.FieldAttribute<SqlDbTypeAttribute>(route), route.Type) != null)
                 return KindOfField.Value;
 
             if (route.Type.UnNullify().IsEnum)
@@ -679,7 +679,7 @@ protected virtual FieldImplementedByAll GenerateFieldImplementedByAll(PropertyRo
 
         protected virtual FieldMList GenerateFieldMList(Table table, PropertyRoute route, NameSequence name)
         {
-            Type elementType = route.Type.ElementType();
+            Type elementType = route.Type.ElementType()!;
 
             if (table.Ticks == null)
                 throw new InvalidOperationException("Type '{0}' has field '{1}' but does not Ticks. MList requires concurrency control.".FormatWith(route.Parent!.Type.TypeName(), route.FieldInfo!.FieldName()));
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
index 3fe6d3da44..f75d1fc17c 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
@@ -25,12 +25,12 @@ public SchemaSettings()
         public PrimaryKeyAttribute DefaultPrimaryKeyAttribute = new PrimaryKeyAttribute(typeof(int), "ID");
         public int DefaultImplementedBySize = 40;
 
-        public Action<Type> AssertNotIncluded = null;
+        public Action<Type> AssertNotIncluded = null!;
 
         public int MaxNumberOfParameters = 2000;
         public int MaxNumberOfStatementsInSaveQueries = 16;
 
-        public ConcurrentDictionary<PropertyRoute, AttributeCollection> FieldAttributesCache = new ConcurrentDictionary<PropertyRoute, AttributeCollection>();
+        public ConcurrentDictionary<PropertyRoute, AttributeCollection?> FieldAttributesCache = new ConcurrentDictionary<PropertyRoute, AttributeCollection?>();
         public ConcurrentDictionary<Type, AttributeCollection> TypeAttributesCache = new ConcurrentDictionary<Type, AttributeCollection>();
 
         public Dictionary<Type, string> UdtSqlName = new Dictionary<Type, string>()
@@ -62,7 +62,7 @@ public SchemaSettings()
             {typeof(Guid), SqlDbType.UniqueIdentifier},
         };
 
-        internal Dictionary<Type, string> desambiguatedNames;
+        internal Dictionary<Type, string>? desambiguatedNames;
 
         Dictionary<SqlDbType, int> defaultSize = new Dictionary<SqlDbType, int>()
         {
@@ -83,10 +83,10 @@ public SchemaSettings()
         public AttributeCollection FieldAttributes<T, S>(Expression<Func<T, S>> propertyRoute)
             where T : IRootEntity
         {
-            return FieldAttributes(PropertyRoute.Construct(propertyRoute));
+            return FieldAttributes(PropertyRoute.Construct(propertyRoute))!;
         }
 
-        public AttributeCollection FieldAttributes(PropertyRoute propertyRoute)
+        public AttributeCollection? FieldAttributes(PropertyRoute propertyRoute)
         {
             using (HeavyProfiler.LogNoStackTrace("FieldAttributes"))
             {
@@ -99,9 +99,9 @@ public AttributeCollection FieldAttributes(PropertyRoute propertyRoute)
                                 return null;
                             return CreateFieldAttributeCollection(propertyRoute);
                         case PropertyRouteType.MListItems:
-                            if (propertyRoute.Parent.FieldInfo == null)
+                            if (propertyRoute.Parent!.FieldInfo == null)
                                 return null;
-                            return CreateFieldAttributeCollection(propertyRoute.Parent);
+                            return CreateFieldAttributeCollection(propertyRoute.Parent!);
                         default:
                             throw new InvalidOperationException("Route of type {0} not supported for this method".FormatWith(propertyRoute.PropertyRouteType));
                     }
@@ -111,7 +111,7 @@ public AttributeCollection FieldAttributes(PropertyRoute propertyRoute)
 
         AttributeCollection CreateFieldAttributeCollection(PropertyRoute route)
         {
-            var fieldAttributes = route.FieldInfo.GetCustomAttributes(false).Cast<Attribute>();
+            var fieldAttributes = route.FieldInfo!.GetCustomAttributes(false).Cast<Attribute>();
             var fieldAttributesInProperty = route.PropertyInfo == null ? Enumerable.Empty<Attribute>() :
                route.PropertyInfo.GetCustomAttributes(false).Cast<Attribute>().Where(a => AttributeCollection.IsCompatibleWith(a, AttributeTargets.Field));
             return new AttributeCollection(AttributeTargets.Field, fieldAttributes.Concat(fieldAttributesInProperty).ToList(), () => AssertNotIncluded(route.RootType));
@@ -164,7 +164,7 @@ public AttributeCollection TypeAttributes(Type entityType)
                 throw new InvalidOperationException($"In order to {errorContext} you need to override the attributes for {pr} {solution}");
         }
 
-        public A FieldAttribute<A>(PropertyRoute propertyRoute) where A : Attribute
+        public A? FieldAttribute<A>(PropertyRoute propertyRoute) where A : Attribute
         {
             using (HeavyProfiler.LogNoStackTrace("FieldAttribute"))
             {
@@ -175,13 +175,13 @@ public A FieldAttribute<A>(PropertyRoute propertyRoute) where A : Attribute
             }
         }
 
-        public V ValidatorAttribute<V>(PropertyRoute propertyRoute) where V: ValidatorAttribute
+        public V? ValidatorAttribute<V>(PropertyRoute propertyRoute) where V: ValidatorAttribute
         {
             if (!typeof(ModifiableEntity).IsAssignableFrom(propertyRoute.RootType))
                 return null;
 
             if (propertyRoute.PropertyRouteType == PropertyRouteType.MListItems)
-                propertyRoute = propertyRoute.Parent;
+                propertyRoute = propertyRoute.Parent!;
 
             if (propertyRoute.PropertyInfo == null)
                 return null;
@@ -223,13 +223,13 @@ private IsNullable GetIsNullablePrivate(PropertyRoute propertyRoute)
             if (ValidatorAttribute<NotNullValidatorAttribute>(propertyRoute) != null)
                 return IsNullable.No;
 
-            if (propertyRoute.Type == typeof(string))
-            {
-                var slv = ValidatorAttribute<StringLengthValidatorAttribute>(propertyRoute);
+            //if (propertyRoute.Type == typeof(string))
+            //{
+            //    var slv = ValidatorAttribute<StringLengthValidatorAttribute>(propertyRoute);
 
-                if (slv != null)
-                    return slv.AllowNulls ? IsNullable.Yes : IsNullable.No;
-            }
+            //    if (slv != null)
+            //        return slv.AllowNulls ? IsNullable.Yes : IsNullable.No;
+            //}
 
             return !propertyRoute.Type.IsValueType || propertyRoute.Type.IsNullable() ? IsNullable.Yes : IsNullable.No;
         }
@@ -268,7 +268,7 @@ public Implementations GetImplementations(PropertyRoute propertyRoute)
                 FieldAttribute<ImplementedByAllAttribute>(propertyRoute));
         }
 
-        internal SqlDbTypePair GetSqlDbType(SqlDbTypeAttribute att, Type type)
+        internal SqlDbTypePair GetSqlDbType(SqlDbTypeAttribute? att, Type type)
         {
             if (att != null && att.HasSqlDbType)
                 return new SqlDbTypePair(att.SqlDbType, att.UserDefinedTypeName);
@@ -276,7 +276,15 @@ internal SqlDbTypePair GetSqlDbType(SqlDbTypeAttribute att, Type type)
             return GetSqlDbTypePair(type.UnNullify());
         }
 
-        internal int? GetSqlSize(SqlDbTypeAttribute att, PropertyRoute? route, SqlDbType sqlDbType)
+        internal SqlDbTypePair? TryGetSqlDbType(SqlDbTypeAttribute? att, Type type)
+        {
+            if (att != null && att.HasSqlDbType)
+                return new SqlDbTypePair(att.SqlDbType, att.UserDefinedTypeName);
+
+            return TryGetSqlDbTypePair(type.UnNullify());
+        }
+
+        internal int? GetSqlSize(SqlDbTypeAttribute? att, PropertyRoute? route, SqlDbType sqlDbType)
         {
             if (att != null && att.HasSize)
                 return att.Size;
@@ -291,7 +299,7 @@ internal SqlDbTypePair GetSqlDbType(SqlDbTypeAttribute att, Type type)
             return defaultSize.TryGetS(sqlDbType);
         }
 
-        internal int? GetSqlScale(SqlDbTypeAttribute att, SqlDbType sqlDbType)
+        internal int? GetSqlScale(SqlDbTypeAttribute? att, SqlDbType sqlDbType)
         {
             if (att != null && att.HasScale)
             {
@@ -304,7 +312,7 @@ internal SqlDbTypePair GetSqlDbType(SqlDbTypeAttribute att, Type type)
             return defaultScale.TryGetS(sqlDbType);
         }
 
-        internal string GetCollate(SqlDbTypeAttribute att)
+        internal string? GetCollate(SqlDbTypeAttribute att)
         {
             if (att != null && att.Collation != null)
                 return att.Collation;
@@ -319,25 +327,34 @@ internal SqlDbType DefaultSqlType(Type type)
 
         public void Desambiguate(Type type, string cleanName)
         {
-            if (desambiguatedNames != null)
+            if (desambiguatedNames == null)
                 desambiguatedNames = new Dictionary<Type, string>();
 
             desambiguatedNames[type] = cleanName;
         }
 
         public SqlDbTypePair GetSqlDbTypePair(Type type)
+        {
+            var result = TryGetSqlDbTypePair(type);
+            if (result == null)
+                throw new ArgumentException($"Type {type.Name} has no DB representation");
+
+            return result;
+        }
+
+        public SqlDbTypePair? TryGetSqlDbTypePair(Type type)
         {
             if (TypeValues.TryGetValue(type, out SqlDbType result))
                 return new SqlDbTypePair(result, null);
 
-            string udtTypeName = GetUdtName(type);
+            string? udtTypeName = GetUdtName(type);
             if (udtTypeName != null)
                 return new SqlDbTypePair(SqlDbType.Udt, udtTypeName);
 
             return null;
         }
 
-        public string GetUdtName(Type udtType)
+        public string? GetUdtName(Type udtType)
         {
             var att = udtType.GetCustomAttribute<SqlUserDefinedTypeAttribute>();
 
@@ -357,11 +374,9 @@ public bool IsDbType(Type type)
     public class SqlDbTypePair
     {
         public SqlDbType SqlDbType { get; private set; }
-        public string UserDefinedTypeName { get; private set; }
-
-        public SqlDbTypePair() { }
-
-        public SqlDbTypePair(SqlDbType type, string udtTypeName)
+        public string? UserDefinedTypeName { get; private set; }
+        
+        public SqlDbTypePair(SqlDbType type, string? udtTypeName)
         {
             this.SqlDbType = type;
             this.UserDefinedTypeName = udtTypeName;
diff --git a/Signum.Engine/Schema/UniqueIndex.cs b/Signum.Engine/Schema/UniqueIndex.cs
index 5df6ea7de2..a877324259 100644
--- a/Signum.Engine/Schema/UniqueIndex.cs
+++ b/Signum.Engine/Schema/UniqueIndex.cs
@@ -169,7 +169,7 @@ static Type RemoveCasting(ref Expression body)
             if (body.NodeType == ExpressionType.Convert && body.Type == typeof(object))
                 body = ((UnaryExpression)body).Operand;
 
-            Type type = null;
+            Type? type = null;
             if ((body.NodeType == ExpressionType.Convert || body.NodeType == ExpressionType.TypeAs) &&
                 body.Type != typeof(object))
             {
diff --git a/Signum.Entities/DynamicQuery/Filter.cs b/Signum.Entities/DynamicQuery/Filter.cs
index f1f8ea7871..7624f28872 100644
--- a/Signum.Entities/DynamicQuery/Filter.cs
+++ b/Signum.Entities/DynamicQuery/Filter.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -47,8 +47,7 @@ public override IEnumerable<FilterCondition> GetFilterConditions()
 
         public override Expression GetExpression(BuildExpressionContext ctx)
         {
-            var anyAll = Token as CollectionAnyAllToken;
-            if(anyAll == null)
+            if (!(Token is CollectionAnyAllToken anyAll))
             {
                 return this.GroupOperation == FilterGroupOperation.And ?
                     Filters.Select(f => f.GetExpression(ctx)).AggregateAnd() :
@@ -56,8 +55,8 @@ public override Expression GetExpression(BuildExpressionContext ctx)
             }
             else
             {
-                Expression collection = anyAll.Parent.BuildExpression(ctx);
-                Type elementType = collection.Type.ElementType();
+                Expression collection = anyAll.Parent!.BuildExpression(ctx);
+                Type elementType = collection.Type.ElementType()!;
 
                 var p = Expression.Parameter(elementType, elementType.Name.Substring(0, 1).ToLower());
                 ctx.Replacemens.Add(anyAll, p);
@@ -90,7 +89,7 @@ public class FilterCondition : Filter
     {
         public QueryToken Token { get; }
         public FilterOperation Operation { get; }
-        public object Value { get; }
+        public object? Value { get; }
 
         public FilterCondition(QueryToken token, FilterOperation operation, object value)
         {
@@ -116,11 +115,11 @@ public override Expression GetExpression(BuildExpressionContext ctx)
             if (anyAll == null)
                 return GetConditionExpressionBasic(ctx);
 
-            Expression collection = anyAll.Parent.BuildExpression(ctx);
-            Type elementType = collection.Type.ElementType();
+            Expression collection = anyAll.Parent!.BuildExpression(ctx);
+            Type elementType = collection.Type.ElementType()!;
 
             var p = Expression.Parameter(elementType, elementType.Name.Substring(0, 1).ToLower());
-            ctx.Replacemens.Add(anyAll, p.BuildLiteNulifyUnwrapPrimaryKey(new[] { anyAll.GetPropertyRoute() }));
+            ctx.Replacemens.Add(anyAll, p.BuildLiteNulifyUnwrapPrimaryKey(new[] { anyAll.GetPropertyRoute()! }));
             var body = GetExpression(ctx);
             ctx.Replacemens.Remove(anyAll);
 
diff --git a/Signum.Entities/DynamicQuery/QueryUtils.cs b/Signum.Entities/DynamicQuery/QueryUtils.cs
index 735426ccdc..90c7d115ba 100644
--- a/Signum.Entities/DynamicQuery/QueryUtils.cs
+++ b/Signum.Entities/DynamicQuery/QueryUtils.cs
@@ -98,7 +98,7 @@ public static List<FilterOperation> GetFilterOperations(FilterType filtertype)
             return FilterOperations[filtertype];
         }
 
-        static Dictionary<FilterType, List<FilterOperation>> FilterOperations = new Dictionary<FilterType, List<FilterOperation>>
+        static readonly Dictionary<FilterType, List<FilterOperation>> FilterOperations = new Dictionary<FilterType, List<FilterOperation>>
         {
             {
                 FilterType.String, new List<FilterOperation>
@@ -419,7 +419,7 @@ public static LambdaExpression CreateOrderLambda(QueryToken token, BuildExpressi
         }
 
 
-        static MethodInfo miToLite = ReflectionTools.GetMethodInfo((Entity ident) => ident.ToLite()).GetGenericMethodDefinition();
+        static readonly MethodInfo miToLite = ReflectionTools.GetMethodInfo((Entity ident) => ident.ToLite()).GetGenericMethodDefinition();
         internal static Expression ExtractEntity(this Expression expression, bool idAndToStr)
         {
             if (expression.Type.IsLite())
@@ -430,7 +430,7 @@ internal static Expression ExtractEntity(this Expression expression, bool idAndT
                 if (!idAndToStr)
                     return Expression.Property(expression, "Entity");
             }
-            return expression;
+            return expression!; /*CSBUG*/
         }
 
         internal static Expression BuildLiteNulifyUnwrapPrimaryKey(this Expression expression, PropertyRoute[] routes)
@@ -496,12 +496,12 @@ internal static Type BuildLite(this Type type)
         }
 
 
-        static MethodInfo miContains = ReflectionTools.GetMethodInfo((string s) => s.Contains(s));
-        static MethodInfo miStartsWith = ReflectionTools.GetMethodInfo((string s) => s.StartsWith(s));
-        static MethodInfo miEndsWith = ReflectionTools.GetMethodInfo((string s) => s.EndsWith(s));
-        static MethodInfo miLike = ReflectionTools.GetMethodInfo((string s) => s.Like(s));
-        static MethodInfo miDistinctNullable = ReflectionTools.GetMethodInfo((string s) => LinqHints.DistinctNull<int>(null, null)).GetGenericMethodDefinition();
-        static MethodInfo miDistinct = ReflectionTools.GetMethodInfo((string s) => LinqHints.DistinctNull<string>(null, null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miContains = ReflectionTools.GetMethodInfo((string s) => s.Contains(s));
+        static readonly MethodInfo miStartsWith = ReflectionTools.GetMethodInfo((string s) => s.StartsWith(s));
+        static readonly MethodInfo miEndsWith = ReflectionTools.GetMethodInfo((string s) => s.EndsWith(s));
+        static readonly MethodInfo miLike = ReflectionTools.GetMethodInfo((string s) => s.Like(s));
+        static readonly MethodInfo miDistinctNullable = ReflectionTools.GetMethodInfo((string s) => LinqHints.DistinctNull<int>(null, null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miDistinct = ReflectionTools.GetMethodInfo((string s) => LinqHints.DistinctNull<string>(null, null)).GetGenericMethodDefinition();
 
         public static Expression GetCompareExpression(FilterOperation operation, Expression left, Expression right, bool inMemory = false)
         {
diff --git a/Signum.Entities/DynamicQuery/ResultTable.cs b/Signum.Entities/DynamicQuery/ResultTable.cs
index 890d29c83e..762f2d85f7 100644
--- a/Signum.Entities/DynamicQuery/ResultTable.cs
+++ b/Signum.Entities/DynamicQuery/ResultTable.cs
@@ -36,7 +36,7 @@ public ResultColumn(Column column, IList values)
         }
 
 
-#pragma warning disable CS8618 // Non-nullable field is uninitialized.
+#pragma warning disable CS8618, IDE0051 // Non-nullable field is uninitialized.
         ResultColumn(SerializationInfo info, StreamingContext context)
         {
             foreach (SerializationEntry entry in info)
@@ -49,7 +49,7 @@ public ResultColumn(Column column, IList values)
                 }
             }
         }
-#pragma warning restore CS8618 // Non-nullable field is uninitialized.
+#pragma warning restore CS8618, IDE0051 // Non-nullable field is uninitialized.
 
         GenericInvoker<Func<int, IList>> listBuilder = new GenericInvoker<Func<int, IList>>(num => new List<int>(num));
 
@@ -207,7 +207,7 @@ static object DeserializeLite(string str, Type defaultEntityType)
 
             string toStr = tmp.After(';');
 
-            Type type = string.IsNullOrEmpty(typeStr) ? defaultEntityType : TypeEntity.TryGetType(typeStr);
+            Type type = string.IsNullOrEmpty(typeStr) ? defaultEntityType : TypeEntity.TryGetType(typeStr)!;
 
             return Lite.Create(type, PrimaryKey.Parse(idStr, type), toStr);
         }
diff --git a/Signum.Entities/DynamicQuery/Tokens/AggregateToken.cs b/Signum.Entities/DynamicQuery/Tokens/AggregateToken.cs
index b182de936d..34527979cc 100644
--- a/Signum.Entities/DynamicQuery/Tokens/AggregateToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/AggregateToken.cs
@@ -62,7 +62,7 @@ public override string ToString()
         {
             string? suffix = GetNiceOperation();
 
-            return " ".CombineIfNotEmpty(AggregateFunction.NiceToString(), this.GeNiceDistinct(), this.GetNiceOperation(), this.GetNiceValue());
+            return " ".Combine(AggregateFunction.NiceToString(), this.GeNiceDistinct(), this.GetNiceOperation(), this.GetNiceValue());
         }
 
         public override string NiceName()
@@ -70,7 +70,7 @@ public override string NiceName()
             if (AggregateFunction == AggregateFunction.Count && Parent == null)
                 return AggregateFunction.NiceToString();
 
-            return " ".CombineIfNotEmpty(AggregateFunction.NiceToString(), this.GeNiceDistinct(), this.GetNiceOperation(), this.GetNiceValue(), "of", Parent);
+            return " ".Combine(AggregateFunction.NiceToString(), this.GeNiceDistinct(), this.GetNiceOperation(), this.GetNiceValue(), "of", Parent);
         }
 
         string? GetNiceOperation()
diff --git a/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs b/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs
index 40ab75ba78..f9adb3f91d 100644
--- a/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/AsTypeToken.cs
@@ -73,7 +73,7 @@ public override string? Unit
             var routeAllowed = GetPropertyRoute()!.IsAllowed();
 
             if (parentAllowed.HasText() && routeAllowed.HasText())
-                QueryTokenMessage.And.NiceToString().CombineIfNotEmpty(parentAllowed, routeAllowed);
+                QueryTokenMessage.And.NiceToString().Combine(parentAllowed, routeAllowed);
 
             return parentAllowed ?? routeAllowed;
         }
diff --git a/Signum.Entities/DynamicQuery/Tokens/CollectionAnyAllToken.cs b/Signum.Entities/DynamicQuery/Tokens/CollectionAnyAllToken.cs
index 53eff2cfcc..7c9e69ac8a 100644
--- a/Signum.Entities/DynamicQuery/Tokens/CollectionAnyAllToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/CollectionAnyAllToken.cs
@@ -14,13 +14,13 @@ public class CollectionAnyAllToken : QueryToken
     {
         public CollectionAnyAllType CollectionAnyAllType { get; private set; }
 
-        QueryToken parent;
+        readonly QueryToken parent;
         public override QueryToken? Parent => parent;
-        
-        Type elementType;
+
+        readonly Type elementType;
         internal CollectionAnyAllToken(QueryToken parent, CollectionAnyAllType type)
         {
-            elementType = parent.Type.ElementType();
+            elementType = parent.Type.ElementType()!;
             if (elementType == null)
                 throw new InvalidOperationException("not a collection");
 
@@ -125,10 +125,10 @@ public override string TypeColor
             get { return "#0000FF"; }
         }
 
-        static MethodInfo miAnyE = ReflectionTools.GetMethodInfo((IEnumerable<string> col) => col.Any(null)).GetGenericMethodDefinition();
-        static MethodInfo miAllE = ReflectionTools.GetMethodInfo((IEnumerable<string> col) => col.All(null)).GetGenericMethodDefinition();
-        static MethodInfo miAnyQ = ReflectionTools.GetMethodInfo((IQueryable<string> col) => col.Any(null)).GetGenericMethodDefinition();
-        static MethodInfo miAllQ = ReflectionTools.GetMethodInfo((IQueryable<string> col) => col.All(null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAnyE = ReflectionTools.GetMethodInfo((IEnumerable<string> col) => col.Any(null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAllE = ReflectionTools.GetMethodInfo((IEnumerable<string> col) => col.All(null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAnyQ = ReflectionTools.GetMethodInfo((IQueryable<string> col) => col.Any(null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAllQ = ReflectionTools.GetMethodInfo((IQueryable<string> col) => col.All(null)).GetGenericMethodDefinition();
 
         public Expression BuildAnyAll(Expression collection, ParameterExpression param, Expression body)
         {
diff --git a/Signum.Entities/DynamicQuery/Tokens/CollectionElementToken.cs b/Signum.Entities/DynamicQuery/Tokens/CollectionElementToken.cs
index 3056feef7b..98de049ebe 100644
--- a/Signum.Entities/DynamicQuery/Tokens/CollectionElementToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/CollectionElementToken.cs
@@ -17,11 +17,10 @@ public class CollectionElementToken : QueryToken
         QueryToken parent;
         public override QueryToken? Parent => parent;
 
-
-        Type elementType;
+        readonly Type elementType;
         internal CollectionElementToken(QueryToken parent, CollectionElementType type)
         {
-            elementType = parent.Type.ElementType();
+            elementType = parent.Type.ElementType()!;
             if (elementType == null)
                 throw new InvalidOperationException("not a collection");
 
@@ -104,7 +103,7 @@ public override bool HasElement()
             if (parent is ExtensionToken et && et.IsProjection)
                 return et.GetElementPropertyRoute();
 
-            PropertyRoute? pr = this.parent.GetPropertyRoute();
+            PropertyRoute? pr = this.parent!.GetPropertyRoute();
             if (pr != null && pr.Type.ElementType() != null)
                 return pr.Add("Item");
 
diff --git a/Signum.Entities/DynamicQuery/Tokens/DecimalSpecialTokens.cs b/Signum.Entities/DynamicQuery/Tokens/DecimalSpecialTokens.cs
index 931f74c097..cbe48cb8ee 100644
--- a/Signum.Entities/DynamicQuery/Tokens/DecimalSpecialTokens.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/DecimalSpecialTokens.cs
@@ -148,7 +148,7 @@ public override string Key
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
-            var exp = parent.Parent.BuildExpression(context);
+            var exp = parent.Parent!.BuildExpression(context);
 
             return RoundingExpressionGenerator.RoundExpression(exp, this.StepSize(), RoundingType.Ceil);
         }
diff --git a/Signum.Entities/DynamicQuery/Tokens/EntityToStringToken.cs b/Signum.Entities/DynamicQuery/Tokens/EntityToStringToken.cs
index b61ec97a34..a95b01b446 100644
--- a/Signum.Entities/DynamicQuery/Tokens/EntityToStringToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/EntityToStringToken.cs
@@ -10,7 +10,7 @@ namespace Signum.Entities.DynamicQuery
     [Serializable]
     public class EntityToStringToken : QueryToken
     {
-        QueryToken parent;
+        readonly QueryToken parent;
         public override QueryToken? Parent => parent;
 
         internal EntityToStringToken(QueryToken parent)
@@ -71,19 +71,9 @@ public override string? Unit
 
         public override PropertyRoute? GetPropertyRoute()
         {
-            PropertyRoute? pr = parent.GetPropertyRoute();
-            if (pr == null)
-            {
-                Type? type = Lite.Extract(pr.Type); //Because Parent.Type is always a lite
-                if (type != null)
-                    return PropertyRoute.Root(type).Add(miToStringProperty);
-            }
-            else
-            {
-                Type? type = Lite.Extract(pr.Type); //Because Add doesn't work with lites
-                if (type != null)
-                    return PropertyRoute.Root(type).Add(miToStringProperty);
-            }
+            Type? type = Lite.Extract(parent.GetPropertyRoute()?.Type ?? parent.Type);
+            if (type != null)
+                return PropertyRoute.Root(type).Add(miToStringProperty);
 
             return null;
         }
diff --git a/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs b/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
index 8b1f462646..b5ea070108 100644
--- a/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/ExtensionToken.cs
@@ -19,7 +19,7 @@ public ExtensionToken(QueryToken parent, string key, Type type, bool isProjectio
         {
             this.parent = parent ?? throw new ArgumentNullException(nameof(parent));
 
-            var shouldHaveImplementations = typeof(IEntity).IsAssignableFrom((isProjection ? type.ElementType() : type).CleanType());
+            var shouldHaveImplementations = typeof(IEntity).IsAssignableFrom((isProjection ? type.ElementType()! : type).CleanType());
 
             if (shouldHaveImplementations && implementations == null)
                 throw new ArgumentException(@"Impossible to determine automatically the implementations for extension token '{0}' (of type {1}) registered on type {2}.
diff --git a/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs b/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
index d56fb20635..c478173303 100644
--- a/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
@@ -362,7 +362,7 @@ public string NiceTypeName
 
                 if (IsCollection(type))
                 {
-                    return QueryTokenMessage.ListOf0.NiceToString().FormatWith(GetNiceTypeName(Type.ElementType(), GetElementImplementations()));
+                    return QueryTokenMessage.ListOf0.NiceToString().FormatWith(GetNiceTypeName(Type.ElementType()!, GetElementImplementations()));
                 }
 
                 return GetNiceTypeName(Type, GetImplementations());
diff --git a/Signum.Entities/FieldAttributes.cs b/Signum.Entities/FieldAttributes.cs
index 887b436b7a..b076e3d841 100644
--- a/Signum.Entities/FieldAttributes.cs
+++ b/Signum.Entities/FieldAttributes.cs
@@ -55,7 +55,7 @@ private IEnumerable<Type> Enumerate()
                 throw new InvalidOperationException("IsByAll");
         }
 
-        public static Implementations? TryFromAttributes(Type t, PropertyRoute route, ImplementedByAttribute ib, ImplementedByAllAttribute iba)
+        public static Implementations? TryFromAttributes(Type t, PropertyRoute route, ImplementedByAttribute? ib, ImplementedByAllAttribute? iba)
         {
             if (ib != null && iba != null)
                 throw new NotSupportedException("Route {0} contains both {1} and {2}".FormatWith(route, ib.GetType().Name, iba.GetType().Name));
@@ -70,7 +70,7 @@ private IEnumerable<Type> Enumerate()
         }
 
 
-        public static Implementations FromAttributes(Type t, PropertyRoute route, ImplementedByAttribute ib, ImplementedByAllAttribute iba)
+        public static Implementations FromAttributes(Type t, PropertyRoute route, ImplementedByAttribute? ib, ImplementedByAllAttribute? iba)
         {
             Implementations? imp = TryFromAttributes(t, route, ib, iba);
 
diff --git a/Signum.Entities/FieldNotificationAttributes.cs b/Signum.Entities/FieldNotificationAttributes.cs
index 777d981ff6..a649ff2957 100644
--- a/Signum.Entities/FieldNotificationAttributes.cs
+++ b/Signum.Entities/FieldNotificationAttributes.cs
@@ -40,7 +40,7 @@ internal static class AttributeManager<T>
                         return null;
 
                     return new TypeAttributePack(
-                        fields: list.Select(fi => ReflectionTools.CreateGetterUntyped(type, fi)).ToArray(),
+                        fields: list.Select(fi => ReflectionTools.CreateGetterUntyped(type, fi)!).ToArray(),
                         propertyNames: list.Select(fi => Reflector.FindPropertyInfo(fi).Name).ToArray()
                     );
                 });
@@ -59,7 +59,7 @@ public static bool FieldContainsAttribute(Type type, PropertyInfo pi)
 
         readonly static object[] EmptyArray = new object[0];
 
-        public static object[] FieldsWithAttribute(ModifiableEntity entity)
+        public static object?[] FieldsWithAttribute(ModifiableEntity entity)
         {
             TypeAttributePack? pack = GetFieldsAndProperties(entity.GetType());
 
@@ -87,10 +87,10 @@ public static object[] FieldsWithAttribute(ModifiableEntity entity)
 
     internal class TypeAttributePack
     {
-        public Func<object, object>[] Fields;
+        public Func<object, object?>[] Fields;
         public string[] PropertyNames;
 
-        public TypeAttributePack(Func<object, object>[] fields, string[] propertyNames)
+        public TypeAttributePack(Func<object, object?>[] fields, string[] propertyNames)
         {
             Fields = fields;
             PropertyNames = propertyNames;
diff --git a/Signum.Entities/Lite.cs b/Signum.Entities/Lite.cs
index d81f0dc2a4..277c83f517 100644
--- a/Signum.Entities/Lite.cs
+++ b/Signum.Entities/Lite.cs
@@ -320,7 +320,7 @@ public static Lite<T> Parse<T>(string liteKey) where T : class, IEntity
             if (!match.Success)
                 return ValidationMessage.InvalidFormat.NiceToString();
 
-            Type type = TypeEntity.TryGetType(match.Groups["type"].Value);
+            Type? type = TypeEntity.TryGetType(match.Groups["type"].Value);
             if (type == null)
                 return LiteMessage.Type0NotFound.NiceToString().FormatWith(match.Groups["type"].Value);
 
@@ -378,7 +378,7 @@ public static Lite<T> ToLiteFat<T>(this T entity)
         }
 
         [DebuggerStepThrough]
-        public static Lite<T> ToLiteFat<T>(this T entity, string toStr)
+        public static Lite<T> ToLiteFat<T>(this T entity, string? toStr)
           where T : class, IEntity
         {
             return (Lite<T>)giNewLiteFat.GetInvoker(entity.GetType())((Entity)(IEntity)entity, toStr ?? entity.ToString());
diff --git a/Signum.Entities/MList.cs b/Signum.Entities/MList.cs
index db3590bf3b..69de1a90fe 100644
--- a/Signum.Entities/MList.cs
+++ b/Signum.Entities/MList.cs
@@ -86,7 +86,9 @@ public override string ToString()
                 return "({0}) {1}".FormatWith(pre, Element);
             }
 
+#pragma warning disable IDE0051 // Remove unused private members
             private RowIdElement(SerializationInfo info, StreamingContext ctxt)
+#pragma warning restore IDE0051 // Remove unused private members
             {
                 this.RowId = null;
                 this.Element = default(T)!;
@@ -121,7 +123,7 @@ void ISerializable.GetObjectData(SerializationInfo info, StreamingContext contex
 
         [NonSerialized]
         NotifyCollectionChangedEventHandler? collectionChanged;
-        event NotifyCollectionChangedEventHandler INotifyCollectionChanged.CollectionChanged
+        public event NotifyCollectionChangedEventHandler CollectionChanged
         {
             add { collectionChanged += value; }
             remove { collectionChanged -= value; }
@@ -639,7 +641,7 @@ List<RowIdElement> IMListPrivate<T>.InnerList
             get { return this.innerList; }
         }
 
-        void IMListPrivate.InnerListModified(IList newItems, IList oldItems)
+        void IMListPrivate.InnerListModified(IList? newItems, IList? oldItems)
         {
             this.SetSelfModified();
 
@@ -807,7 +809,7 @@ public interface IMListPrivate
         void SetRowId(int index, PrimaryKey rowId);
         void ForceRowId(int index, PrimaryKey rowId);
 
-        void InnerListModified(IList newItems, IList oldItems);
+        void InnerListModified(IList? newItems, IList? oldItems);
 
         void AssignAndPostRetrieving(IMListPrivate newList);
     }
@@ -822,7 +824,7 @@ public interface IMListPrivate<T>  : IMListPrivate
 
     internal sealed class MListDebugging<T>
     {
-        private ICollection<T> collection;
+        private readonly ICollection<T> collection;
 
         public MListDebugging(ICollection<T> collection)
         {
diff --git a/Signum.Entities/MixinEntity.cs b/Signum.Entities/MixinEntity.cs
index ff9a304f89..cdaaacd15a 100644
--- a/Signum.Entities/MixinEntity.cs
+++ b/Signum.Entities/MixinEntity.cs
@@ -167,7 +167,7 @@ static class MixinSetterCache<T> where T : MixinEntity
 
             internal static Action<T, V> Setter<V>(PropertyInfo pi)
             {
-                return (Action<T, V>)cache.GetOrAdd(pi.Name, s => ReflectionTools.CreateSetter<T, V>(Reflector.FindFieldInfo(typeof(T), pi)));
+                return (Action<T, V>)cache.GetOrAdd(pi.Name, s => ReflectionTools.CreateSetter<T, V>(Reflector.FindFieldInfo(typeof(T), pi))!);
             }
         }
 
@@ -181,7 +181,7 @@ on nm.GetType() equals om.GetType()
 
             foreach (var pair in list)
             {
-                pair.nm.CopyFrom(pair.om, args);
+                pair.nm!.CopyFrom(pair.om!, args); /*CSBUG*/
             }
 
             return newEntity;
diff --git a/Signum.Entities/ModifiableEntity.cs b/Signum.Entities/ModifiableEntity.cs
index a8eb69c778..d56bd7b135 100644
--- a/Signum.Entities/ModifiableEntity.cs
+++ b/Signum.Entities/ModifiableEntity.cs
@@ -114,7 +114,7 @@ public PropertyKey(Type type, string propertyName)
             public override int GetHashCode() => Type.GetHashCode() ^ PropertyName.GetHashCode();
         }
 
-        static ConcurrentDictionary<PropertyKey, PropertyInfo> PropertyCache = new ConcurrentDictionary<PropertyKey, PropertyInfo>();
+        static readonly ConcurrentDictionary<PropertyKey, PropertyInfo> PropertyCache = new ConcurrentDictionary<PropertyKey, PropertyInfo>();
 
         protected PropertyInfo GetPropertyInfo(string propertyName)
         {
@@ -143,7 +143,7 @@ protected internal override void PostRetrieving()
 
         protected virtual void RebindEvents()
         {
-            foreach (INotifyCollectionChanged notify in AttributeManager<NotifyCollectionChangedAttribute>.FieldsWithAttribute(this))
+            foreach (INotifyCollectionChanged? notify in AttributeManager<NotifyCollectionChangedAttribute>.FieldsWithAttribute(this))
             {
                 if (notify == null)
                     continue;
@@ -432,7 +432,7 @@ public IntegrityCheck(ModifiableEntity me, Dictionary<string, string> errors)
 
         public override string ToString()
         {
-            return $"{Errors.Count} errors in {" ".CombineIfNotEmpty(Type.Name, Id)}\r\n"
+            return $"{Errors.Count} errors in {" ".Combine(Type.Name, Id)}\r\n"
                   + Errors.ToString(kvp => "    {0}: {1}".FormatWith(kvp.Key, kvp.Value), "\r\n");
         }
     }
@@ -451,7 +451,7 @@ public IntegrityCheckWithEntity(IntegrityCheck integrityCheck, ModifiableEntity
         public override string ToString()
         {
             var validators = Validator.GetPropertyValidators(Entity.GetType());
-            return $"{IntegrityCheck.Errors.Count} errors in {" ".CombineIfNotEmpty(IntegrityCheck.Type.Name, IntegrityCheck.Id)}\r\n"
+            return $"{IntegrityCheck.Errors.Count} errors in {" ".Combine(IntegrityCheck.Type.Name, IntegrityCheck.Id)}\r\n"
                   + IntegrityCheck.Errors.ToString(kvp => "    {0} ({1}): {2}".FormatWith(
                       kvp.Key,
                       validators.GetOrThrow(kvp.Key).GetValueUntyped(Entity), 
diff --git a/Signum.Entities/Patterns/CorruptEntity.cs b/Signum.Entities/Patterns/CorruptEntity.cs
index 2fba0adc08..02f3e819d5 100644
--- a/Signum.Entities/Patterns/CorruptEntity.cs
+++ b/Signum.Entities/Patterns/CorruptEntity.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using Signum.Utilities;
 
@@ -36,16 +36,18 @@ public static class Corruption
 
         public static bool Strict { get { return !allowed.Value; } }
 
-        public static IDisposable AllowScope()
+        public static IDisposable? AllowScope()
         {
-            if (allowed.Value) return null;
+            if (allowed.Value)
+                return null;
             allowed.Value = true;
             return new Disposable(() => allowed.Value = false);
         }
 
-        public static IDisposable DenyScope()
+        public static IDisposable? DenyScope()
         {
-            if (!allowed.Value) return null;
+            if (!allowed.Value)
+                return null;
             allowed.Value = false;
             return new Disposable(() => allowed.Value = true);
         }
diff --git a/Signum.Entities/Patterns/LockeableEntity.cs b/Signum.Entities/Patterns/LockeableEntity.cs
index f14d833a61..d85daef7ef 100644
--- a/Signum.Entities/Patterns/LockeableEntity.cs
+++ b/Signum.Entities/Patterns/LockeableEntity.cs
@@ -43,7 +43,7 @@ protected override bool Set<T>(ref T field, T value, [CallerMemberNameAttribute]
         protected override void ChildCollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs args)
         {
             if (this.locked)
-                throw new ApplicationException(EntityMessage.AttemptToAddRemove0InLockedEntity1.NiceToString(sender.GetType().ElementType().NicePluralName(), this.ToString()));
+                throw new ApplicationException(EntityMessage.AttemptToAddRemove0InLockedEntity1.NiceToString(sender.GetType().ElementType()!.NicePluralName(), this.ToString()));
 
             base.ChildCollectionChanged(sender, args);
         }
diff --git a/Signum.Entities/PropertyAttributes.cs b/Signum.Entities/PropertyAttributes.cs
index 6c649a52f8..36ca411d7b 100644
--- a/Signum.Entities/PropertyAttributes.cs
+++ b/Signum.Entities/PropertyAttributes.cs
@@ -29,7 +29,7 @@ public class UnitAttribute : Attribute
     {
         public static Dictionary<string, Func<string>> UnitTranslations = new Dictionary<string, Func<string>>();
 
-        public static string GetTranslation(string unitName)
+        public static string? GetTranslation(string unitName)
         {
             if (string.IsNullOrEmpty(unitName))
                 return null;
diff --git a/Signum.Entities/PropertyRoute.cs b/Signum.Entities/PropertyRoute.cs
index 67aedee18b..701e63c050 100644
--- a/Signum.Entities/PropertyRoute.cs
+++ b/Signum.Entities/PropertyRoute.cs
@@ -382,7 +382,7 @@ public static void SetIsAllowedCallback(Func<PropertyRoute, string> isAllowed)
             return null;
         }
 
-        static PropertyInfo piId = ReflectionTools.GetPropertyInfo((Entity a) => a.Id);
+        static readonly PropertyInfo piId = ReflectionTools.GetPropertyInfo((Entity a) => a.Id);
 
 
         public static List<PropertyRoute> GenerateRoutes(Type type, bool includeIgnored = true)
@@ -403,7 +403,7 @@ public static List<PropertyRoute> GenerateRoutes(Type type, bool includeIgnored
 
                 if (Reflector.IsMList(pi.PropertyType))
                 {
-                    Type colType = pi.PropertyType.ElementType();
+                    Type colType = pi.PropertyType.ElementType()!;
                     if (Reflector.IsEmbeddedEntity(colType))
                         result.AddRange(GenerateEmbeddedProperties(route.Add("Item"), includeIgnored));
                 }
@@ -432,7 +432,7 @@ static List<PropertyRoute> GenerateEmbeddedProperties(PropertyRoute embeddedProp
 
                     if (Reflector.IsMList(pi.PropertyType))
                     {
-                        Type colType = pi.PropertyType.ElementType();
+                        Type colType = pi.PropertyType.ElementType()!;
                         if (Reflector.IsEmbeddedEntity(colType))
                             result.AddRange(GenerateEmbeddedProperties(route.Add("Item"), includeIgnored));
                     }
@@ -508,7 +508,9 @@ public PropertyRoute SimplifyToPropertyOrRoot()
             }
         }
 
-        private PropertyRoute(SerializationInfo info, StreamingContext ctxt)
+#pragma warning disable IDE0051 // Remove unused private members
+        PropertyRoute(SerializationInfo info, StreamingContext ctxt)
+#pragma warning restore IDE0051 // Remove unused private members
         {
             string rootName = info.GetString("rootType");
 
diff --git a/Signum.Entities/Reflection/GraphExplorer.cs b/Signum.Entities/Reflection/GraphExplorer.cs
index bca73c788f..032867f0db 100644
--- a/Signum.Entities/Reflection/GraphExplorer.cs
+++ b/Signum.Entities/Reflection/GraphExplorer.cs
@@ -110,7 +110,7 @@ public static DirectedGraph<Modifiable> FromRootsEntity<T>(IEnumerable<T> roots)
 
             DirectedGraph<Modifiable> identGraph = DirectedGraph<Modifiable>.Generate(graph.Where(a => a is Entity), graph.RelatedTo);
 
-            var identErrors = identGraph.OfType<Entity>().Select(ident => ident.EntityIntegrityCheck()).Where(errors => errors != null).SelectMany(errors => errors.Values);
+            var identErrors = identGraph.OfType<Entity>().Select(ident => ident.EntityIntegrityCheck()).NotNull().SelectMany(errors => errors.Values);
 
             var modErros = graph.Except(identGraph).OfType<ModifiableEntity>()
                             .Select(a => a.IntegrityCheck())
@@ -324,7 +324,7 @@ private static XAttribute[] GetAttributes(IList list)
                new XAttribute("Label", (list.ToString() ?? "[null]") +  Modified((Modifiable)list)),
                new XAttribute("TypeName", list.GetType().TypeName()),
                new XAttribute("NodeRadius", 2),
-               new XAttribute("Background", ColorExtensions.ToHtmlColor(list.GetType().ElementType().FullName.GetHashCode())),
+               new XAttribute("Background", ColorExtensions.ToHtmlColor(list.GetType().ElementType()!.FullName.GetHashCode())),
             };
         }
 
diff --git a/Signum.Entities/Reflection/ModifyInspector.cs b/Signum.Entities/Reflection/ModifyInspector.cs
index 301009fe5e..cc80c8c010 100644
--- a/Signum.Entities/Reflection/ModifyInspector.cs
+++ b/Signum.Entities/Reflection/ModifyInspector.cs
@@ -10,29 +10,27 @@ namespace Signum.Entities.Reflection
 {
     public class ModifyInspector
     {
-        static Dictionary<Type, Func<object, object>[]> getterCache = new Dictionary<Type, Func<object, object>[]>();
-
-        static Func<object, object>[] ModifiableFieldGetters(Type type)
+        static readonly Dictionary<Type, Func<object, object?>[]> getterCache = new Dictionary<Type, Func<object, object?>[]>();
+        static Func<object, object?>[] ModifiableFieldGetters(Type type)
         {
             lock (getterCache)
                 return getterCache.GetOrCreate(type, () =>
                 {
                     FieldInfo[] aux = Reflector.InstanceFieldsInOrder(type);
                     return aux.Where(fi => Reflector.IsModifiableIdentifiableOrLite(fi.FieldType) && !IsIgnored(fi))
-                        .Select(fi => ReflectionTools.CreateGetterUntyped(type, fi)).ToArray();
+                        .Select(fi => ReflectionTools.CreateGetterUntyped(type, fi)!).ToArray();
                 });
         }
 
-        static Dictionary<Type, Func<object, object>[]> getterVirtualCache = new Dictionary<Type, Func<object, object>[]>();
-
-        static Func<object, object>[] ModifiableFieldGettersVirtual(Type type)
+        static readonly Dictionary<Type, Func<object, object?>[]> getterVirtualCache = new Dictionary<Type, Func<object, object?>[]>();
+        static Func<object, object?>[] ModifiableFieldGettersVirtual(Type type)
         {
             lock (getterVirtualCache)
                 return getterVirtualCache.GetOrCreate(type, () =>
                 {
                     FieldInfo[] aux = Reflector.InstanceFieldsInOrder(type);
                     return aux.Where(fi => Reflector.IsModifiableIdentifiableOrLite(fi.FieldType) && (!IsIgnored(fi) || IsQueryableProperty(fi)))
-                        .Select(fi => ReflectionTools.CreateGetterUntyped(type, fi)).ToArray();
+                        .Select(fi => ReflectionTools.CreateGetterUntyped(type, fi)!).ToArray();
                 });
         }
 
@@ -55,7 +53,7 @@ public static IEnumerable<Modifiable> FullExplore(Modifiable obj)
 
             if (Reflector.IsMList(obj.GetType()))
             {
-                Type t = obj.GetType().ElementType();
+                Type t = obj.GetType().ElementType()!;
                 if (Reflector.IsModifiableIdentifiableOrLite(t))
                 {
                     IEnumerable col = (IEnumerable)obj;
@@ -93,7 +91,7 @@ public static IEnumerable<Modifiable> FullExploreVirtual(Modifiable obj)
 
             if (Reflector.IsMList(obj.GetType()))
             {
-                Type t = obj.GetType().ElementType();
+                Type t = obj.GetType().ElementType()!;
                 if (Reflector.IsModifiableIdentifiableOrLite(t))
                 {
                     IEnumerable col = (IEnumerable)obj;
@@ -131,7 +129,7 @@ public static IEnumerable<Modifiable> EntityExplore(Modifiable obj)
 
             if (Reflector.IsMList(obj.GetType()))
             {
-                Type t = obj.GetType().ElementType();
+                Type t = obj.GetType().ElementType()!;
 
                 if (t.IsModifiable() && !t.IsEntity())
                 {
diff --git a/Signum.Entities/Services/Security.cs b/Signum.Entities/Services/Security.cs
index 80b81944a0..31d0f27328 100644
--- a/Signum.Entities/Services/Security.cs
+++ b/Signum.Entities/Services/Security.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Text;
 using System.Security.Cryptography;
 
@@ -19,9 +19,8 @@ public static string GetSHA1(string str)
         {
             SHA1 sha1 = SHA1Managed.Create();
             ASCIIEncoding encoding = new ASCIIEncoding();
-            byte[] stream = null;
             StringBuilder sb = new StringBuilder();
-            stream = sha1.ComputeHash(encoding.GetBytes(str));
+            byte[] stream = sha1.ComputeHash(encoding.GetBytes(str));
             for (int i = 0; i < stream.Length; i++)
                 sb.AppendFormat("{0:x2}", stream[i]);
             return sb.ToString();
@@ -103,4 +102,4 @@ public static string CalculateMD5Hash(byte[] inputBytes)
         }
 
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Entities/SystemTime.cs b/Signum.Entities/SystemTime.cs
index ef33aaa475..6d6fc991b2 100644
--- a/Signum.Entities/SystemTime.cs
+++ b/Signum.Entities/SystemTime.cs
@@ -133,7 +133,7 @@ public static Interval<DateTime> SystemPeriod<E, T>(this MListElement<E, T> mlis
 
 
         static ConstructorInfo ciInterval = ReflectionTools.GetConstuctorInfo(() => new Interval<DateTime>(new DateTime(), new DateTime()));
-        internal static Expression Intesection(this NewExpression? interval1, NewExpression? interval2)
+        internal static Expression? Intesection(this NewExpression? interval1, NewExpression? interval2)
         {
             if (interval1 == null)
                 return interval2;
diff --git a/Signum.React/Scripts/Signum.Entities.Basics.ts b/Signum.React/Scripts/Signum.Entities.Basics.ts
index ed27536bb5..98310ed3fa 100644
--- a/Signum.React/Scripts/Signum.Entities.Basics.ts
+++ b/Signum.React/Scripts/Signum.Entities.Basics.ts
@@ -67,8 +67,8 @@ export interface OperationLogEntity extends Entities.Entity {
   Type: "OperationLog";
   target: Entities.Lite<Entities.Entity> | null;
   origin: Entities.Lite<Entities.Entity> | null;
-  operation: Entities.OperationSymbol;
-  user: Entities.Lite<IUserEntity>;
+  operation: Entities.OperationSymbol | null;
+  user: Entities.Lite<IUserEntity> | null;
   start: string;
   end: string | null;
   exception: Entities.Lite<ExceptionEntity> | null;
@@ -77,14 +77,14 @@ export interface OperationLogEntity extends Entities.Entity {
 export const PropertyRouteEntity = new Type<PropertyRouteEntity>("PropertyRoute");
 export interface PropertyRouteEntity extends Entities.Entity {
   Type: "PropertyRoute";
-  path: string;
+  path: string | null;
   rootType: TypeEntity;
 }
 
 export const QueryEntity = new Type<QueryEntity>("Query");
 export interface QueryEntity extends Entities.Entity {
   Type: "Query";
-  key: string;
+  key: string | null;
 }
 
 export interface SemiSymbol extends Entities.Entity {
@@ -95,10 +95,10 @@ export interface SemiSymbol extends Entities.Entity {
 export const TypeEntity = new Type<TypeEntity>("Type");
 export interface TypeEntity extends Entities.Entity {
   Type: "Type";
-  tableName: string;
-  cleanName: string;
-  namespace: string;
-  className: string;
+  tableName: string | null;
+  cleanName: string | null;
+  namespace: string | null;
+  className: string | null;
 }
 
 
diff --git a/Signum.React/Scripts/Signum.Entities.ts b/Signum.React/Scripts/Signum.Entities.ts
index 7e12265029..5cd7dbee18 100644
--- a/Signum.React/Scripts/Signum.Entities.ts
+++ b/Signum.React/Scripts/Signum.Entities.ts
@@ -471,7 +471,7 @@ export module SelectorMessage {
 }
 
 export interface Symbol extends Entity {
-  key: string;
+  key: string | null;
 }
 
 export module SynchronizerMessage {
@@ -549,6 +549,7 @@ export module ValidationMessage {
   export const _0Have1ElementsButAllowedOnly2 = new MessageKey("ValidationMessage", "_0Have1ElementsButAllowedOnly2");
   export const _0IsEmpty = new MessageKey("ValidationMessage", "_0IsEmpty");
   export const _AtLeastOneValueIsNeeded = new MessageKey("ValidationMessage", "_AtLeastOneValueIsNeeded");
+  export const BeAString = new MessageKey("ValidationMessage", "BeAString");
 }
 
 export module VoidEnumMessage {
diff --git a/Signum.Utilities/DataStructures/DirectedEdgedGraph.cs b/Signum.Utilities/DataStructures/DirectedEdgedGraph.cs
index 2502f1956b..f28ebccc7d 100644
--- a/Signum.Utilities/DataStructures/DirectedEdgedGraph.cs
+++ b/Signum.Utilities/DataStructures/DirectedEdgedGraph.cs
@@ -7,6 +7,7 @@
 namespace Signum.Utilities.DataStructures
 {
     public class DirectedEdgedGraph<T, E> : IEnumerable<T>
+        where T: object
     {
         Dictionary<T, Dictionary<T, E>> adjacency;
         public IEqualityComparer<T> Comparer { get; private set; }
@@ -149,7 +150,7 @@ public static void RemoveFullNodeSymetric(DirectedEdgedGraph<T, E> original, Dir
             inverse.RemoveFullNode(node, to);
         }
 
-        Dictionary<T, E> TryGet(T node)
+        Dictionary<T, E>? TryGet(T node)
         {
             return adjacency.TryGetC(node);
         }
@@ -360,15 +361,15 @@ public override string ToString()
 
         public string ToGraphviz()
         {
-            return ToGraphviz(typeof(E).Name, a => a.ToString(), e => e.ToString());
+            return ToGraphviz(typeof(E).Name, a => a.ToString(), e => e?.ToString());
         }
 
         public string ToGraphviz(string name)
         {
-            return ToGraphviz(name, a => a.ToString(), e => e.ToString());
+            return ToGraphviz(name, a => a.ToString(), e => e?.ToString());
         }
 
-        public string ToGraphviz(string name, Func<T, string> getNodeLabel, Func<E, string> getEdgeLabel)
+        public string ToGraphviz(string name, Func<T, string> getNodeLabel, Func<E, string?> getEdgeLabel)
         {
             int num = 0;
             Dictionary<T, int> nodeDic = Nodes.ToDictionary(n => n, n => num++, Comparer);
@@ -385,7 +386,7 @@ public XDocument ToDGML()
             return ToDGML(
                 a => a.ToString() ?? "[null]",
                 a => ColorExtensions.ToHtmlColor(a.GetType().FullName.GetHashCode()),
-                e => e.ToString() ?? "[null]");
+                e => e?.ToString() ?? "[null]");
         }
 
         public XDocument ToDGML(Func<T, string> getNodeLabel, Func<T, string> getColor, Func<E, string>? getEdgeLabel = null)
@@ -545,7 +546,7 @@ public DirectedEdgedGraph<T, E> WhereEdges(Func<Edge<T, E>, bool> condition, boo
             }
         }
 
-        public List<T> ShortestPath(T from, T to, Func<E, int> getWeight)
+        public List<T>? ShortestPath(T from, T to, Func<E, int> getWeight)
         {
             //http://en.wikipedia.org/wiki/Dijkstra's_algorithm
 
diff --git a/Signum.Utilities/DataStructures/DirectedGraph.cs b/Signum.Utilities/DataStructures/DirectedGraph.cs
index bc811f22c6..25b2bea5a5 100644
--- a/Signum.Utilities/DataStructures/DirectedGraph.cs
+++ b/Signum.Utilities/DataStructures/DirectedGraph.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Collections;
@@ -7,8 +7,9 @@
 namespace Signum.Utilities.DataStructures
 {
     public class DirectedGraph<T> : IEnumerable<T>
+        where T : object
     {
-        Dictionary<T, HashSet<T>> adjacency;
+        readonly Dictionary<T, HashSet<T>> adjacency;
         public IEqualityComparer<T> Comparer { get; private set; }
 
         public DirectedGraph()
@@ -142,7 +143,7 @@ public static void RemoveFullNodeSymetric(DirectedGraph<T> original, DirectedGra
             inverse.RemoveFullNode(node, to);
         }
 
-        HashSet<T> TryGet(T node)
+        HashSet<T>? TryGet(T node)
         {
             return adjacency.TryGetC(node);
         }
@@ -464,7 +465,7 @@ public DirectedGraph<T> FeedbackEdgeSet()
                     continue;
                 }
 
-                Func<T, int> fanInOut = n => clone.RelatedTo(n).Count() - inv.RelatedTo(n).Count();
+                int fanInOut(T n) => clone.RelatedTo(n).Count() - inv.RelatedTo(n).Count();
 
                 MinMax<T> mm = clone.WithMinMaxPair(fanInOut);
 
@@ -502,7 +503,7 @@ public DirectedGraph<T> WhereEdges(Func<Edge<T>, bool> condition)
             return result;
         }
 
-        public List<T> ShortestPath(T from, T to)
+        public List<T>? ShortestPath(T from, T to)
         {
             //http://en.wikipedia.org/wiki/Dijkstra's_algorithm
 
diff --git a/Signum.Utilities/DataStructures/IntervalDictionaries/CubeDictionary.cs b/Signum.Utilities/DataStructures/IntervalDictionaries/CubeDictionary.cs
index 96864f7f9b..77a3105a11 100644
--- a/Signum.Utilities/DataStructures/IntervalDictionaries/CubeDictionary.cs
+++ b/Signum.Utilities/DataStructures/IntervalDictionaries/CubeDictionary.cs
@@ -70,7 +70,7 @@ public bool TryGetValue(K1 x, K2 y, K3 z, out V value)
                 !yDimension.TryGetValue(y, out int iy) ||
                 !zDimension.TryGetValue(z, out int iz) || !used[ix, iy, iz])
             {
-                value = default(V);
+                value = default(V)!;
                 return false;
             }
 
diff --git a/Signum.Utilities/DataStructures/IntervalDictionaries/Interval.cs b/Signum.Utilities/DataStructures/IntervalDictionaries/Interval.cs
index e108dfa86a..a9c13554c5 100644
--- a/Signum.Utilities/DataStructures/IntervalDictionaries/Interval.cs
+++ b/Signum.Utilities/DataStructures/IntervalDictionaries/Interval.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq.Expressions;
@@ -308,7 +308,7 @@ public override int GetHashCode()
             return min.GetHashCode();
         }
 
-        public string ToString(string format, IFormatProvider formatProvider)
+        public string ToString(string? format, IFormatProvider formatProvider)
         {
             if (string.IsNullOrEmpty(format))
                 return BuildString(formatProvider, "{0} - {1}", "< {0}", "{0} ≤", "All");
diff --git a/Signum.Utilities/DataStructures/IntervalDictionaries/IntervalDictionary.cs b/Signum.Utilities/DataStructures/IntervalDictionaries/IntervalDictionary.cs
index efb122ff22..4b800f5daf 100644
--- a/Signum.Utilities/DataStructures/IntervalDictionaries/IntervalDictionary.cs
+++ b/Signum.Utilities/DataStructures/IntervalDictionaries/IntervalDictionary.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Collections;
 using System.Linq;
@@ -153,7 +153,7 @@ public V TryGet(K key, V defaultValue)
 
         public bool TryGetValue(K key, out V value)
         {
-            value = default(V);
+            value = default(V)!;
 
             int index = PossibleIndex(key);
             if (index == -1)
@@ -287,7 +287,7 @@ public static class IntervalDictionaryExtensions
         public static IntervalDictionary<K, VR> Mix<K, V1, V2, VR>(this IntervalDictionary<K, V1> me, IntervalDictionary<K, V2> other, Func<Interval<K>, IntervalValue<V1>, IntervalValue<V2>, IntervalValue<VR>> mixer)
             where K : struct, IComparable<K>, IEquatable<K>
         {
-            Interval<K>[] keys = me.Intervals.Concat(other.Intervals).SelectMany(a => a.Elements()).Distinct().OrderBy().BiSelect((min, max) => new Interval<K>(min, max)).ToArray();
+            Interval<K>[] keys = me.Intervals.Concat(other.Intervals).SelectMany(a => a.Elements()).Distinct().OrderBy().BiSelectS((min, max) => new Interval<K>(min.Value, max.Value)).ToArray();
             return new IntervalDictionary<K, VR>(keys
                 .Select(k => new { Intervalo = k, Valor = mixer(k, me.TryGetValue(k.Min), other.TryGetValue(k.Min)) })
                 .Where(a => a.Valor.HasInterval).Select(a => KVP.Create(a.Intervalo, a.Valor.Value)));
@@ -296,14 +296,14 @@ public static IntervalDictionary<K, VR> Mix<K, V1, V2, VR>(this IntervalDictiona
         public static IntervalDictionary<K, VR> Collapse<K, V, VR>(this IEnumerable<IntervalDictionary<K, V>> collection, Func<Interval<K>, IEnumerable<V>, VR> mixer)
             where K : struct, IComparable<K>, IEquatable<K>
         {
-            Interval<K>[] keys = collection.SelectMany(a => a).SelectMany(a => a.Key.Elements()).Distinct().OrderBy().BiSelect((min, max) => new Interval<K>(min, max)).ToArray();
+            Interval<K>[] keys = collection.SelectMany(a => a).SelectMany(a => a.Key.Elements()).Distinct().OrderBy().BiSelectS((min, max) => new Interval<K>(min.Value, max.Value)).ToArray();
             return new IntervalDictionary<K, VR>(keys.Select(k => KVP.Create(k, mixer(k, collection.Select(intDic => intDic.TryGetValue(k.Min)).Where(vi => vi.HasInterval).Select(vi => vi.Value)))));
         }
 
         public static IntervalDictionary<K, VR> AggregateIntervalDictionary<K, V, VR>(this IEnumerable<(Interval<K> interval, V value)> collection, Func<Interval<K>, IEnumerable<V>, VR> mixer)
            where K : struct, IComparable<K>, IEquatable<K>
         {
-            Interval<K>[] keys = collection.SelectMany(a => a.interval.Elements()).Distinct().OrderBy().BiSelect((min, max) => new Interval<K>(min, max)).ToArray();
+            Interval<K>[] keys = collection.SelectMany(a => a.interval.Elements()).Distinct().OrderBy().BiSelectS((min, max) => new Interval<K>(min.Value, max.Value)).ToArray();
             return new IntervalDictionary<K, VR>(keys.Select(k => KVP.Create(k, mixer(k, collection.Where(a => a.interval.Subset(k)).Select(a => a.value)))));
         }
 
diff --git a/Signum.Utilities/DataStructures/IntervalDictionaries/SquareDictionary.cs b/Signum.Utilities/DataStructures/IntervalDictionaries/SquareDictionary.cs
index 5d14a0317f..077a2c5d01 100644
--- a/Signum.Utilities/DataStructures/IntervalDictionaries/SquareDictionary.cs
+++ b/Signum.Utilities/DataStructures/IntervalDictionaries/SquareDictionary.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 
@@ -62,7 +62,7 @@ public bool TryGetValue(K1 x, K2 y, out V value)
             if (!xDimension.TryGetValue(x, out int ix) ||
                 !yDimension.TryGetValue(y, out int iy) || !used[ix,iy])
             {
-                value = default(V);
+                value = default(V)!;
                 return false;
             }
 
diff --git a/Signum.Utilities/DataStructures/RecentsDictionary.cs b/Signum.Utilities/DataStructures/RecentsDictionary.cs
index cce52ae359..8fe5d0c11c 100644
--- a/Signum.Utilities/DataStructures/RecentsDictionary.cs
+++ b/Signum.Utilities/DataStructures/RecentsDictionary.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Text;
 using System.Collections;
@@ -28,7 +28,7 @@ public RecentDictionary(int capacity): this(capacity, null)
         {
         }
 
-        public RecentDictionary(int capacity, IEqualityComparer<K> comparer)
+        public RecentDictionary(int capacity, IEqualityComparer<K>? comparer)
         {
             this.capacity = capacity;
             keyToLink = new Dictionary<K, LinkedListNode<V>>(comparer);
@@ -83,7 +83,7 @@ public bool Contains(K key)
 
         public bool Remove(K key)
         {
-            LinkedListNode<V> link = keyToLink.TryGetC(key);
+            LinkedListNode<V>? link = keyToLink.TryGetC(key);
 
             if (link == null)
                 return false;
@@ -137,7 +137,7 @@ public bool TryGetValue(K key, out V value)
                 return true;
             }
 
-            value = default(V);
+            value = default(V)!;
             return false;
         }
 
@@ -181,7 +181,7 @@ public override string ToString()
                 if (buff.Length > 1)
                     buff.Append(", ");
 
-                buff.Append(item.ToString());
+                buff.Append(item?.ToString());
             }
 
             buff.Append("]");
diff --git a/Signum.Utilities/DescriptionManager.cs b/Signum.Utilities/DescriptionManager.cs
index 18db70bc06..d77b6310e1 100644
--- a/Signum.Utilities/DescriptionManager.cs
+++ b/Signum.Utilities/DescriptionManager.cs
@@ -123,7 +123,7 @@ public static class DescriptionManager
 
         public static event Func<Type, DescriptionOptions?> DefaultDescriptionOptions = t => t.IsEnum && t.Name.EndsWith("Message") ? DescriptionOptions.Members : (DescriptionOptions?)null;
         public static event Func<MemberInfo, bool> ShouldLocalizeMemeber = m => true;
-        public static event Action<CultureInfo,Type,MemberInfo> NotLocalizedMemeber ;
+        public static event Action<CultureInfo, MemberInfo> NotLocalizedMember;
 
         public static Dictionary<Type, Func<MemberInfo, string>> ExternalEnums = new Dictionary<Type, Func<MemberInfo, string>>
         {
@@ -131,14 +131,14 @@ public static class DescriptionManager
         };
 
 
-        static string Fallback(Type type, Func<LocalizedType, string> typeValue, Action<LocalizedType> notLocalized)
+        static string Fallback(Type type, Func<LocalizedType, string?> typeValue, Action<LocalizedType> notLocalized)
         {
             var cc = CultureInfo.CurrentUICulture;
             {
                 var loc = GetLocalizedType(type, cc);
                 if (loc != null)
                 {
-                    string result = typeValue(loc);
+                    string? result = typeValue(loc);
                     if (result != null)
                         return result;                  
                 }
@@ -149,17 +149,13 @@ static string Fallback(Type type, Func<LocalizedType, string> typeValue, Action<
                 var loc = GetLocalizedType(type, cc.Parent);
                 if (loc != null)
                 {
-                    string result = typeValue(loc);
+                    string? result = typeValue(loc);
                     if (result != null)
                         return result;              
                 }
-             
             }
 
-  
-
             var defaultCulture = LocalizedAssembly.GetDefaultAssemblyCulture(type.Assembly);
-            //if (defaultCulture != null)
             {
                 var loc = GetLocalizedType(type, CultureInfo.GetCultureInfo(defaultCulture));
                 if (loc == null)
@@ -168,10 +164,8 @@ static string Fallback(Type type, Func<LocalizedType, string> typeValue, Action<
                 if (notLocalized != null)
                     notLocalized.Invoke(loc);
                         
-                return typeValue(loc);
+                return typeValue(loc)!;
             }
-
-            //return null;
         }
 
 
@@ -184,7 +178,7 @@ public static string NiceName(this Type type)
                 return type.GetCustomAttribute<DescriptionAttribute>()?.Description ?? type.Name.NiceName();
             }
 
-            var result = Fallback(type, lt => lt.Description, lt => OnNotLocalizedMemeber(type, null));
+            var result = Fallback(type, lt => lt.Description, lt => OnNotLocalizedMember(type));
 
             if (result != null)
                 return result;
@@ -197,7 +191,7 @@ public static string NicePluralName(this Type type)
         {
             type = CleanType(type);
 
-            var result = Fallback(type, lt => lt.PluralDescription, lt => OnNotLocalizedMemeber(type,null));
+            var result = Fallback(type, lt => lt.PluralDescription, lt => OnNotLocalizedMember(type));
 
             if (result != null)
                 return result;
@@ -213,9 +207,6 @@ public static string NiceToString(this Enum a, params object[] args)
 
         public static string NiceToString(this Enum a)
         {
-            if (a == null)
-                return null;
-
             var fi = EnumFieldCache.Get(a.GetType()).TryGetC(a);
             if (fi != null)
                 return GetMemberNiceName(fi) ?? DefaultMemberDescription(fi);
@@ -263,23 +254,17 @@ static string GetMemberNiceName(MemberInfo memberInfo)
 
                 return memberInfo.GetCustomAttribute<DescriptionAttribute>()?.Description ?? memberInfo.Name.NiceName();
             }
-       
-            var result = Fallback(type, lt => lt.Members.TryGetC(memberInfo.Name), lt => OnNotLocalizedMemeber(null,memberInfo));
+
+            var result = Fallback(type, lt => lt.Members!.TryGetC(memberInfo.Name), lt => OnNotLocalizedMember(memberInfo));
             if (result != null)
                 return result;
 
-
-
             return result;
         }
 
-        private static void OnNotLocalizedMemeber(Type  type, MemberInfo memberInfo)
+        private static void OnNotLocalizedMember(MemberInfo memberInfo)
         {
-            if (NotLocalizedMemeber != null)
-            {
-                var cc = CultureInfo.CurrentUICulture;
-                NotLocalizedMemeber.Invoke(cc, type, memberInfo);
-            }
+            NotLocalizedMember?.Invoke(CultureInfo.CurrentUICulture, memberInfo);
         }
 
         public static char? GetGender(this Type type)
@@ -307,10 +292,10 @@ private static void OnNotLocalizedMemeber(Type  type, MemberInfo memberInfo)
             return null;
         }
 
-        static ConcurrentDictionary<CultureInfo, ConcurrentDictionary<Assembly, LocalizedAssembly>> localizations = 
-            new ConcurrentDictionary<CultureInfo, ConcurrentDictionary<Assembly, LocalizedAssembly>>();
+        static ConcurrentDictionary<CultureInfo, ConcurrentDictionary<Assembly, LocalizedAssembly?>> localizations = 
+            new ConcurrentDictionary<CultureInfo, ConcurrentDictionary<Assembly, LocalizedAssembly?>>();
 
-        public static LocalizedType GetLocalizedType(Type type, CultureInfo cultureInfo)
+        public static LocalizedType? GetLocalizedType(Type type, CultureInfo cultureInfo)
         {
             var la = GetLocalizedAssembly(type.Assembly, cultureInfo);
 
@@ -328,11 +313,11 @@ public static LocalizedType GetLocalizedType(Type type, CultureInfo cultureInfo)
             return null;
         }
 
-        public static LocalizedAssembly GetLocalizedAssembly(Assembly assembly, CultureInfo cultureInfo)
+        public static LocalizedAssembly? GetLocalizedAssembly(Assembly assembly, CultureInfo cultureInfo)
         {
             return localizations
-                .GetOrAdd(cultureInfo, ci => new ConcurrentDictionary<Assembly, LocalizedAssembly>())
-                .GetOrAdd(assembly, (Assembly a) => LocalizedAssembly.ImportXml(assembly, cultureInfo, forceCreate : false));
+                .GetOrAdd(cultureInfo, ci => new ConcurrentDictionary<Assembly, LocalizedAssembly?>())
+                .GetOrAdd(assembly, (Assembly a) => LocalizedAssembly.ImportXml(assembly, cultureInfo, forceCreate: false));
         }
 
         internal static DescriptionOptions? OnDefaultDescriptionOptions(Type type)
@@ -458,7 +443,7 @@ select lt.ExportXml()
             return doc;
         }
   
-        public static LocalizedAssembly ImportXml(Assembly assembly, CultureInfo cultureInfo, bool forceCreate)
+        public static LocalizedAssembly? ImportXml(Assembly assembly, CultureInfo cultureInfo, bool forceCreate)
         {
             var defaultCulture = GetDefaultAssemblyCulture(assembly);
 
@@ -469,7 +454,7 @@ public static LocalizedAssembly ImportXml(Assembly assembly, CultureInfo culture
 
             string fileName = TranslationFileName(assembly, cultureInfo);
 
-            XDocument doc = !File.Exists(fileName) ? null : XDocument.Load(fileName);
+            XDocument? doc = !File.Exists(fileName) ? null : XDocument.Load(fileName);
 
             if (!isDefault && !forceCreate && doc == null)
                 return null;
@@ -477,9 +462,9 @@ public static LocalizedAssembly ImportXml(Assembly assembly, CultureInfo culture
             return FromXml(assembly, cultureInfo, doc, null);
         }
 
-        public static LocalizedAssembly FromXml(Assembly assembly, CultureInfo cultureInfo, XDocument doc, Dictionary<string, string> replacements /*new -> old*/)
+        public static LocalizedAssembly FromXml(Assembly assembly, CultureInfo cultureInfo, XDocument? doc, Dictionary<string, string>? replacements /*new -> old*/)
         {
-            Dictionary<string, XElement> file = doc?.Element("Translations").Elements("Type")
+            Dictionary<string, XElement>? file = doc?.Element("Translations").Elements("Type")
                 .Select(x => KVP.Create(x.Attribute("Name").Value, x))
                 .Distinct(x => x.Key)
                 .ToDictionary();
@@ -513,11 +498,11 @@ public class LocalizedType
         public LocalizedAssembly Assembly { get; private set; }
         public DescriptionOptions Options { get; private set; }
 
-        public string Description { get; set; }
-        public string PluralDescription { get; set; }
+        public string? Description { get; set; }
+        public string? PluralDescription { get; set; }
         public char? Gender { get; set; }
 
-        public Dictionary<string, string> Members = new Dictionary<string, string>();
+        public Dictionary<string, string>? Members { get; set; }
 
         LocalizedType() { }
 
@@ -533,19 +518,19 @@ public XElement ExportXml()
 
                     !Options.IsSetAssert(DescriptionOptions.PluralDescription, Type) ||
                     PluralDescription == null ||
-                    (PluralDescription == NaturalLanguageTools.Pluralize(Description, Assembly.Culture)) ? null :
+                    (PluralDescription == NaturalLanguageTools.Pluralize(Description!, Assembly.Culture)) ? null :
                     new XAttribute("PluralDescription", PluralDescription),
 
                     !Options.IsSetAssert(DescriptionOptions.Gender, Type) ||
                     Gender == null ||
-                    (Gender == NaturalLanguageTools.GetGender(Description, Assembly.Culture)) ? null :
+                    (Gender == NaturalLanguageTools.GetGender(Description!, Assembly.Culture)) ? null :
                     new XAttribute("Gender", Gender.ToString()),
 
                     !Options.IsSetAssert(DescriptionOptions.Members, Type) ? null :
                      (from m in GetMembers(Type)
                       where DescriptionManager.OnShouldLocalizeMember(m)
                       orderby m.Name
-                      let value = Members.TryGetC(m.Name)
+                      let value = Members!.TryGetC(m.Name)
                       where value != null && !(Assembly.IsDefault && (DescriptionManager.DefaultMemberDescription(m) == value))
                       select new XElement("Member", new XAttribute("Name", m.Name), new XAttribute("Description", value)))
                 );
@@ -566,7 +551,7 @@ public static IEnumerable<MemberInfo> GetMembers(Type type)
 
         internal static LocalizedType ImportXml(Type type, DescriptionOptions opts, LocalizedAssembly assembly, XElement x)
         {
-            string description = !opts.IsSetAssert(DescriptionOptions.Description, type) ? null :
+            string? description = !opts.IsSetAssert(DescriptionOptions.Description, type) ? null :
                 (x == null || x.Attribute("Name").Value != type.Name ? null : x.Attribute("Description")?.Value) ??
                 (!assembly.IsDefault ? null : DescriptionManager.DefaultTypeDescription(type));
 
@@ -618,8 +603,8 @@ public bool Contains(string text)
         public bool ContainsDescription(string text)
         {
             return this.Type.Name.Contains(text, StringComparison.InvariantCultureIgnoreCase) ||
-                            this.Description != null && this.Description.Contains(text, StringComparison.InvariantCultureIgnoreCase) ||
-                            this.PluralDescription != null && this.Description.Contains(text, StringComparison.InvariantCultureIgnoreCase);
+                this.Description?.Contains(text, StringComparison.InvariantCultureIgnoreCase) == true ||
+                this.PluralDescription?.Contains(text, StringComparison.InvariantCultureIgnoreCase) == true;
         }
     }
 
diff --git a/Signum.Utilities/Disposable.cs b/Signum.Utilities/Disposable.cs
index cddf772f89..9819eeed35 100644
--- a/Signum.Utilities/Disposable.cs
+++ b/Signum.Utilities/Disposable.cs
@@ -28,7 +28,7 @@ public void Dispose()
             var secondEx = second as IDisposableException;
 
             if (firstEx == null && secondEx == null)
-                return new Disposable(() => { try { first.Dispose(); } finally { second.Dispose(); } });
+                return new Disposable(() => { try { first!.Dispose(); } finally { second!.Dispose(); } });
 
             return new DisposableException(              
                 ex =>
@@ -36,15 +36,15 @@ public void Dispose()
                     try { if (firstEx != null) firstEx.OnException(ex); }
                     finally { if (secondEx != null) secondEx.OnException(ex); }
                 },
-                () => { try { first.Dispose(); } finally { second.Dispose(); } });
+                () => { try { first!.Dispose(); } finally { second!.Dispose(); } });
         }
 
-        public static IDisposable Combine<Del>(Del delegated, Func<Del, IDisposable> invoke) where Del : class, ICloneable, ISerializable
+        public static IDisposable? Combine<Del>(Del delegated, Func<Del, IDisposable> invoke) where Del : class, ICloneable, ISerializable
         {
             if (delegated == null)
                 return null;
 
-            IDisposable result = null;
+            IDisposable? result = null;
             foreach (var func in delegated.GetInvocationListTyped())
             {
                 try
diff --git a/Signum.Utilities/ExpressionExpanderSamples.cs b/Signum.Utilities/ExpressionExpanderSamples.cs
index f778cf5f41..dcd0f7be03 100644
--- a/Signum.Utilities/ExpressionExpanderSamples.cs
+++ b/Signum.Utilities/ExpressionExpanderSamples.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -89,11 +89,11 @@ public static bool None<TSource>(this IEnumerable<TSource> source, Func<TSource,
 
     class ExpandContainsAny : IMethodExpander
 	{
-        static MethodInfo miContains = ReflectionTools.GetMethodInfo(() => "".Contains(""));
+        static readonly MethodInfo miContains = ReflectionTools.GetMethodInfo(() => "".Contains(""));
 
         public Expression Expand(Expression instance, Expression[] parameters, MethodInfo mi)
         {
-            var parts = (string[])ExpressionEvaluator.Eval(parameters[1]);
+            var parts = (string[])ExpressionEvaluator.Eval(parameters[1])!;
 
             return parts.Select(p => (Expression)Expression.Call(parameters[0], miContains, Expression.Constant(p))).AggregateOr();
         }
@@ -101,11 +101,11 @@ public Expression Expand(Expression instance, Expression[] parameters, MethodInf
 
     class ExpandContainsAll : IMethodExpander
     {
-        static MethodInfo miContains = ReflectionTools.GetMethodInfo(() => "".Contains(""));
+        static readonly MethodInfo miContains = ReflectionTools.GetMethodInfo(() => "".Contains(""));
 
         public Expression Expand(Expression instance, Expression[] parameters, MethodInfo mi)
         {
-            var parts = (string[])ExpressionEvaluator.Eval(parameters[1]);
+            var parts = (string[])ExpressionEvaluator.Eval(parameters[1])!;
 
             return parts.Select(p => (Expression)Expression.Call(parameters[0], miContains, Expression.Constant(p))).AggregateAnd();
         }
@@ -114,30 +114,27 @@ public Expression Expand(Expression instance, Expression[] parameters, MethodInf
 
     class ExpandNone : IMethodExpander 
     {
-        static MethodInfo miAnyEnumerable = ReflectionTools.GetMethodInfo(() => Enumerable.Any((IEnumerable<string>)null)).GetGenericMethodDefinition();
-        static MethodInfo miAnyQueryable = ReflectionTools.GetMethodInfo(() =>Queryable.Any((IQueryable<string>)null)).GetGenericMethodDefinition();
-        static MethodInfo miAnyEnumerableWithPredicate = ReflectionTools.GetMethodInfo(() =>Enumerable.Any((IEnumerable<string>)null, null)).GetGenericMethodDefinition();
-        static MethodInfo miAnyQueryableWithPredicate  = ReflectionTools.GetMethodInfo(() => Queryable.Any((IQueryable<string>)null, null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAnyEnumerable = ReflectionTools.GetMethodInfo(() => Enumerable.Any((IEnumerable<string>)null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAnyQueryable = ReflectionTools.GetMethodInfo(() =>Queryable.Any((IQueryable<string>)null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAnyEnumerableWithPredicate = ReflectionTools.GetMethodInfo(() =>Enumerable.Any((IEnumerable<string>)null, null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAnyQueryableWithPredicate  = ReflectionTools.GetMethodInfo(() => Queryable.Any((IQueryable<string>)null, null)).GetGenericMethodDefinition();
 
         public Expression Expand(Expression instance, Expression[] arguments, MethodInfo mi)
         {
             Type foo = mi.DeclaringType;
             Type bar = typeof(Queryable);
-            MethodInfo any = getAny(mi).MakeGenericMethod(mi.GetGenericArguments());
+            MethodInfo any = GetAny(mi).MakeGenericMethod(mi.GetGenericArguments());
             return Expression.Not(Expression.Call(any, arguments));
         }
 
-        private MethodInfo getAny(MethodInfo mi)
+        private MethodInfo GetAny(MethodInfo mi)
         {
-
             var parameters = mi.GetParameters();
             bool query = parameters[0].ParameterType.IsInstantiationOf(typeof(IQueryable<>));
             if (parameters.Length == 1)
                 return query ? miAnyQueryable : miAnyEnumerable;
             else
                 return query ? miAnyQueryableWithPredicate : miAnyEnumerableWithPredicate;
-            
-            
         }
     }
 
diff --git a/Signum.Utilities/ExpressionTrees/CSharpRenderer.cs b/Signum.Utilities/ExpressionTrees/CSharpRenderer.cs
index 2ff3a8c31c..02603e942e 100644
--- a/Signum.Utilities/ExpressionTrees/CSharpRenderer.cs
+++ b/Signum.Utilities/ExpressionTrees/CSharpRenderer.cs
@@ -102,7 +102,7 @@ static string TypeNameSimple(Type type, List<Type> globalGenericArguments)
             if (type.IsEnum)
                 return type.Name;
 
-            string result = BasicTypeNames.TryGetC(Type.GetTypeCode(type));
+            string? result = BasicTypeNames.TryGetC(Type.GetTypeCode(type));
             if (result != null)
                 return result;
 
@@ -142,8 +142,9 @@ public static string Value(object obj)
 
             if (obj is string s)
                 return ToSrtringLiteral(s);
-
-            if (obj.GetType().IsEnum)
+
+            obj = obj!/*CSBUG*/;
+            if (obj.GetType().IsEnum)
                 return $"{obj.GetType().FullName}.{obj.ToString()}";
 
             return obj.ToString();
diff --git a/Signum.Utilities/ExpressionTrees/ExpandableQueryProvider.cs b/Signum.Utilities/ExpressionTrees/ExpandableQueryProvider.cs
index 63675c30b9..221f66c975 100644
--- a/Signum.Utilities/ExpressionTrees/ExpandableQueryProvider.cs
+++ b/Signum.Utilities/ExpressionTrees/ExpandableQueryProvider.cs
@@ -29,7 +29,7 @@ public object Execute(Expression expression)
 
 		public IQueryable<S> CreateQuery<S>(Expression expression)
 		{
-            Expression res = ExpressionCleaner.Clean(expression);
+            Expression res = ExpressionCleaner.Clean(expression)!;
 			return new ExpandableQueryProvider<S>(_item.Provider.CreateQuery<S>(res));
 		}
 
@@ -38,12 +38,12 @@ public S Execute<S>(Expression expression)
 			return _item.Provider.Execute<S>(expression);
 		}
 
-		IEnumerator<T> IEnumerable<T>.GetEnumerator()
-		{
-			return _item.GetEnumerator();
-		}
+        public IEnumerator<T> GetEnumerator()
+        {
+            return _item.GetEnumerator();
+        }
 
-		public Type ElementType
+        public Type ElementType
 		{
 			get { return _item.ElementType; }
 		}
diff --git a/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs b/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs
index d5c645c6fe..72346ef88e 100644
--- a/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs
+++ b/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs
@@ -25,7 +25,7 @@ public class ExpressionCleaner : ExpressionVisitor
             return Clean(expr, ExpressionEvaluator.PartialEval, true);
         }
 
-        public static Expression Clean(Expression expr, Func<Expression, Expression> partialEval, bool shortCircuit)
+        public static Expression? Clean(Expression? expr, Func<Expression, Expression> partialEval, bool shortCircuit)
         {
             ExpressionCleaner ee = new ExpressionCleaner()
             {
@@ -59,7 +59,7 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
         {
             if (m.Method.DeclaringType == typeof(ExpressionExtensions) && m.Method.Name == "Evaluate")
             {
-                LambdaExpression lambda = (LambdaExpression)(ExpressionEvaluator.Eval(m.Arguments[0]));
+                LambdaExpression lambda = (LambdaExpression)ExpressionEvaluator.Eval(m.Arguments[0])!;
 
                 return Expression.Invoke(lambda, m.Arguments.Skip(1).ToArray());
             }
@@ -191,15 +191,13 @@ static bool IsStatic(MemberInfo mi)
             if (obj == null)
                 throw new InvalidOperationException("Expression field '{0}' is null".FormatWith(efa.Name));
 
-            var result = obj as LambdaExpression;
-
-            if (result == null)
+            if (!(obj is LambdaExpression result))
                 throw new InvalidOperationException("Expression field '{0}' does not contain a lambda expression".FormatWith(efa.Name, type.TypeName()));
 
             return result;
         }
 
-        static BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
+        static readonly BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
 
         static MemberInfo? GetMember(Type decType, MemberInfo mi)
         {
@@ -235,10 +233,9 @@ static bool IsStatic(MemberInfo mi)
 
         static MemberInfo? BaseMember(MemberInfo mi)
         {
-            MemberInfo result;
+            MemberInfo? result;
             if (mi is MethodInfo mti)
                 result = mti.GetBaseDefinition();
-
             else if (mi is PropertyInfo pi)
                 result = pi.GetBaseDefinition();
             else
diff --git a/Signum.Utilities/ExpressionTrees/ExpressionComparer.cs b/Signum.Utilities/ExpressionTrees/ExpressionComparer.cs
index 88f261fd2a..c77f53b666 100644
--- a/Signum.Utilities/ExpressionTrees/ExpressionComparer.cs
+++ b/Signum.Utilities/ExpressionTrees/ExpressionComparer.cs
@@ -26,12 +26,12 @@ protected ExpressionComparer(ScopedDictionary<ParameterExpression, ParameterExpr
             this.checkParameterNames = checkParameterNames;
         }
 
-        public static bool AreEqual( Expression a, Expression b, ScopedDictionary<ParameterExpression, ParameterExpression>? parameterScope = null, bool checkParameterNames = false)
+        public static bool AreEqual(Expression? a, Expression? b, ScopedDictionary<ParameterExpression, ParameterExpression>? parameterScope = null, bool checkParameterNames = false)
         {
             return new ExpressionComparer(parameterScope, checkParameterNames).Compare(a, b);
         }
 
-        protected virtual bool Compare(Expression a, Expression b)
+        protected virtual bool Compare(Expression? a, Expression? b)
         {
             if (a == b)
                 return true;
@@ -264,7 +264,7 @@ protected virtual bool CompareListInit(ListInitExpression a, ListInitExpression
                 && CompareList(a.Initializers, b.Initializers, CompareElementInit);
         }
 
-        protected static bool CompareList<T>(ReadOnlyCollection<T> a, ReadOnlyCollection<T> b, Func<T, T, bool> comparer)
+        protected static bool CompareList<T>(ReadOnlyCollection<T>? a, ReadOnlyCollection<T>? b, Func<T, T, bool> comparer)
         {
             if (a == b)
                 return true;
diff --git a/Signum.Utilities/ExpressionTrees/ExpressionEvaluator.cs b/Signum.Utilities/ExpressionTrees/ExpressionEvaluator.cs
index 345731919a..85b2ea34ab 100644
--- a/Signum.Utilities/ExpressionTrees/ExpressionEvaluator.cs
+++ b/Signum.Utilities/ExpressionTrees/ExpressionEvaluator.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq.Expressions;
 using System.Reflection;
@@ -12,9 +12,12 @@ namespace Signum.Utilities.ExpressionTrees
     /// </summary>
     public class ExpressionEvaluator : ExpressionVisitor
     {
-        HashSet<Expression> candidates;
-
-        private ExpressionEvaluator() { }
+        readonly HashSet<Expression> candidates;
+        
+        public ExpressionEvaluator(HashSet<Expression> candidates)
+        {
+            this.candidates = candidates;
+        }
 
         /// <summary>
         /// Performs evaluation & replacement of independent sub-trees
@@ -29,10 +32,10 @@ public static Expression PartialEval(Expression exp)
 
             HashSet<Expression> candidates = ExpressionNominator.Nominate(exp);
 
-            return new ExpressionEvaluator { candidates = candidates }.Visit(exp);
+            return new ExpressionEvaluator(candidates).Visit(exp)!;
         }
 
-        public static object Eval(Expression expression)
+        public static object? Eval(Expression expression)
         {
             switch (expression.NodeType)
             {
@@ -113,8 +116,8 @@ public static object Eval(Expression expression)
 
         public struct MethodKey : IEquatable<MethodKey>
         {
-            MethodInfo mi;
-            Type[] arguments;
+            readonly MethodInfo mi;
+            readonly Type[]? arguments;
 
             public MethodKey(MethodInfo mi)
             {
@@ -156,7 +159,8 @@ public override int GetHashCode()
                 var result = mi.MetadataToken ^ mi.DeclaringType.GetHashCode();
                 if (!mi.IsGenericMethod)
                     return result;
-                Type[] types = arguments;
+                
+                Type[] types = arguments!;
                 for (int i = 0; i < types.Length; i++)
                     result ^= i ^ types[i].GetHashCode();
 
@@ -164,61 +168,60 @@ public override int GetHashCode()
             }
         }
 
-        static ConcurrentDictionary<MethodKey, Func<object>> cachedStaticMethods = new ConcurrentDictionary<MethodKey, Func<object>>();
-        private static Func<object> GetStaticMethodCaller(MethodInfo mi)
+        static readonly ConcurrentDictionary<MethodKey, Func<object?>> cachedStaticMethods = new ConcurrentDictionary<MethodKey, Func<object?>>();
+        private static Func<object?> GetStaticMethodCaller(MethodInfo mi)
         {
             return cachedStaticMethods.GetOrAdd(new MethodKey(mi), (MethodKey _) =>
             {
-                return Expression.Lambda<Func<object>>(Expression.Convert(Expression.Call(mi), typeof(object))).Compile();
+                return Expression.Lambda<Func<object?>>(Expression.Convert(Expression.Call(mi), typeof(object))).Compile();
             });
         }
 
-        static ConcurrentDictionary<MethodKey, Func<object, object>> cachedExtensionMethods = new ConcurrentDictionary<MethodKey, Func<object, object>>();
-        private static Func<object, object> GetExtensionMethodCaller(MethodInfo mi)
+        static readonly ConcurrentDictionary<MethodKey, Func<object?, object?>> cachedExtensionMethods = new ConcurrentDictionary<MethodKey, Func<object?, object?>>();
+        private static Func<object?, object?> GetExtensionMethodCaller(MethodInfo mi)
         {
             return cachedExtensionMethods.GetOrAdd(new MethodKey(mi), (MethodKey _) =>
             {
                 ParameterExpression p = Expression.Parameter(typeof(object), "p");
-                return Expression.Lambda<Func<object, object>>(Expression.Convert(Expression.Call(mi, Expression.Convert(p, mi.GetParameters()[0].ParameterType)), typeof(object)), p).Compile();
+                return Expression.Lambda<Func<object?, object?>>(Expression.Convert(Expression.Call(mi, Expression.Convert(p, mi.GetParameters()[0].ParameterType)), typeof(object)), p).Compile();
             });
         }
 
 
-        static ConcurrentDictionary<MethodKey, Func<object, object>> cachedInstanceMethods = new ConcurrentDictionary<MethodKey, Func<object, object>>();
-        private static Func<object, object> GetInstanceMethodCaller(MethodInfo mi)
+        static readonly ConcurrentDictionary<MethodKey, Func<object?, object?>> cachedInstanceMethods = new ConcurrentDictionary<MethodKey, Func<object?, object?>>();
+        private static Func<object?, object?> GetInstanceMethodCaller(MethodInfo mi)
         {
             return cachedInstanceMethods.GetOrAdd(new MethodKey(mi), (MethodKey _) =>
             {
                 ParameterExpression p = Expression.Parameter(typeof(object), "p");
-                return Expression.Lambda<Func<object, object>>(Expression.Convert(Expression.Call(Expression.Convert(p, mi.DeclaringType), mi), typeof(object)), p).Compile();
+                return Expression.Lambda<Func<object?, object?>>(Expression.Convert(Expression.Call(Expression.Convert(p, mi.DeclaringType), mi), typeof(object)), p).Compile();
             });
         }
 
-        static ConcurrentDictionary<(Type type, string name), Func<object>> cachedStaticGetters = new ConcurrentDictionary<(Type type, string name), Func<object>>();
-        private static Func<object> GetStaticGetter(MemberInfo mi)
+        static readonly ConcurrentDictionary<(Type type, string name), Func<object?>> cachedStaticGetters = new ConcurrentDictionary<(Type type, string name), Func<object?>>();
+        private static Func<object?> GetStaticGetter(MemberInfo mi)
         {
             return cachedStaticGetters.GetOrAdd((type: mi.DeclaringType, name: mi.Name), _ =>
             {
-                return Expression.Lambda<Func<object>>(Expression.Convert(Expression.MakeMemberAccess(null, mi), typeof(object))).Compile();
+                return Expression.Lambda<Func<object?>>(Expression.Convert(Expression.MakeMemberAccess(null, mi), typeof(object?))).Compile();
             });
         }
 
-        static ConcurrentDictionary<(Type type, string name), Func<object, object>> cachedInstanceGetters = new ConcurrentDictionary<(Type type, string name), Func<object, object>>();
-        private static Func<object, object> GetInstanceGetter(MemberInfo mi)
+        static readonly ConcurrentDictionary<(Type type, string name), Func<object?, object?>> cachedInstanceGetters = new ConcurrentDictionary<(Type type, string name), Func<object?, object?>>();
+        private static Func<object?, object?> GetInstanceGetter(MemberInfo mi)
         {
             return cachedInstanceGetters.GetOrAdd((type: mi.DeclaringType, name: mi.Name), _ =>
             {
                 ParameterExpression p = Expression.Parameter(typeof(object), "p");
-                return Expression.Lambda<Func<object, object>>(Expression.Convert(Expression.MakeMemberAccess(Expression.Convert(p, mi.DeclaringType), mi), typeof(object)), p).Compile();
+                return Expression.Lambda<Func<object?, object?>>(Expression.Convert(Expression.MakeMemberAccess(Expression.Convert(p, mi.DeclaringType), mi), typeof(object)), p).Compile();
             });
         }
 
-        public override Expression Visit(Expression exp)
+        public override Expression? Visit(Expression? exp)
         {
             if (exp == null)
-            {
                 return null;
-            }
+
             if (this.candidates.Contains(exp))
             {
                 if (exp.NodeType == ExpressionType.Constant)
@@ -236,4 +239,4 @@ public override Expression Visit(Expression exp)
             return base.Visit(exp);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Utilities/ExpressionTrees/ExpressionHelper.cs b/Signum.Utilities/ExpressionTrees/ExpressionHelper.cs
index abb57f59e9..781b9fef5d 100644
--- a/Signum.Utilities/ExpressionTrees/ExpressionHelper.cs
+++ b/Signum.Utilities/ExpressionTrees/ExpressionHelper.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Diagnostics;
@@ -22,9 +22,8 @@ public static Expression TryConvert(this Expression expression, Type type)
         }
 
         [DebuggerStepThrough]
-        public static Expression TryRemoveConvert(this Expression expression, Func<Type, bool> isAllowed)
+        public static Expression? TryRemoveConvert(this Expression expression, Func<Type, bool> isAllowed)
         {
-
             if (expression.NodeType == ExpressionType.Convert && isAllowed(expression.Type))
                 return ((UnaryExpression)expression).Operand;
 
@@ -112,7 +111,7 @@ public static Expression GetArgument(this MethodCallExpression mce, string param
         }
 
         [DebuggerStepThrough]
-        public static Expression TryGetArgument(this MethodCallExpression mce, string parameterName)
+        public static Expression? TryGetArgument(this MethodCallExpression mce, string parameterName)
         {
             int index = FindParameter(mce.Method.GetParameters(), parameterName);
 
@@ -135,9 +134,6 @@ private static int FindParameter(ParameterInfo[] parameters, string parameterNam
         [DebuggerStepThrough]
         public static LambdaExpression StripQuotes(this Expression e)
         {
-            if (e == null)
-                return null;
-
             if (e is ConstantExpression)
                 return (LambdaExpression)((ConstantExpression)e).Value;
 
@@ -151,7 +147,7 @@ public static LambdaExpression StripQuotes(this Expression e)
         [DebuggerStepThrough]
         public static bool IsBase(this IQueryable query)
         {
-            ConstantExpression ce = query.Expression as ConstantExpression;
+            ConstantExpression? ce = query.Expression as ConstantExpression;
             return ce != null && ce.Value == query;
         }
 
diff --git a/Signum.Utilities/ExpressionTrees/ExpressionReplacer.cs b/Signum.Utilities/ExpressionTrees/ExpressionReplacer.cs
index e4853c683d..1d1c54fa14 100644
--- a/Signum.Utilities/ExpressionTrees/ExpressionReplacer.cs
+++ b/Signum.Utilities/ExpressionTrees/ExpressionReplacer.cs
@@ -1,29 +1,28 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq.Expressions;
 
 namespace Signum.Utilities.ExpressionTrees
 {
     public class ExpressionReplacer: ExpressionVisitor
     {
-        Dictionary<ParameterExpression, Expression> replacements = new Dictionary<ParameterExpression, Expression>();
+        Dictionary<ParameterExpression, Expression> replacements;
+
+        public ExpressionReplacer(Dictionary<ParameterExpression, Expression> replacements)
+        {
+            this.replacements = replacements;
+        }
 
         public static Expression Replace(InvocationExpression invocation)
         {
-            LambdaExpression lambda = invocation.Expression as LambdaExpression;
-            var replacer = new ExpressionReplacer()
-            {
-                replacements = 0.To(lambda.Parameters.Count).ToDictionaryEx(i => lambda.Parameters[i], i => invocation.Arguments[i])
-            };
+            LambdaExpression lambda = (LambdaExpression)invocation.Expression;
+            var replacer = new ExpressionReplacer(0.To(lambda.Parameters.Count).ToDictionaryEx(i => lambda.Parameters[i], i => invocation.Arguments[i]));
 
             return replacer.Visit(lambda.Body);
         }
 
         public static Expression Replace(Expression expression, Dictionary<ParameterExpression, Expression> replacements)
         {
-            var replacer = new ExpressionReplacer()
-            {
-                replacements = replacements
-            };
+            var replacer = new ExpressionReplacer(replacements);
 
             return replacer.Visit(expression);
         }
diff --git a/Signum.Utilities/ExpressionTrees/Query.cs b/Signum.Utilities/ExpressionTrees/Query.cs
index d7ad966698..a77a961945 100644
--- a/Signum.Utilities/ExpressionTrees/Query.cs
+++ b/Signum.Utilities/ExpressionTrees/Query.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Collections;
@@ -66,7 +66,7 @@ public override string ToString()
             if (expression is ConstantExpression ce && ce.Value == this)
                 return this.GetType().TypeName().CleanIdentifiers();
             else
-                return expression.ToString();
+                return expression!/*CSBUG*/.ToString();
         }
 
         public string QueryText
diff --git a/Signum.Utilities/ExpressionTrees/QueryProvider.cs b/Signum.Utilities/ExpressionTrees/QueryProvider.cs
index 7285ea5b80..aa5c60823d 100644
--- a/Signum.Utilities/ExpressionTrees/QueryProvider.cs
+++ b/Signum.Utilities/ExpressionTrees/QueryProvider.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;
@@ -40,7 +40,7 @@ S IQueryProvider.Execute<S>(Expression expression)
             return (S)this.Execute(expression);
         }
 
-        object IQueryProvider.Execute(Expression expression)
+        object? IQueryProvider.Execute(Expression expression)
         {
             return this.Execute(expression);
         }
diff --git a/Signum.Utilities/ExpressionTrees/QueryableAsyncExtensions.cs b/Signum.Utilities/ExpressionTrees/QueryableAsyncExtensions.cs
index d9f6069580..d36b708f33 100644
--- a/Signum.Utilities/ExpressionTrees/QueryableAsyncExtensions.cs
+++ b/Signum.Utilities/ExpressionTrees/QueryableAsyncExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -11,7 +11,7 @@ namespace Signum.Utilities.ExpressionTrees
 
     public interface IQueryProviderAsync : IQueryProvider
     {
-        Task<object> ExecuteAsync(Expression expression, CancellationToken token);
+        Task<object?> ExecuteAsync(Expression expression, CancellationToken token);
     }
 
     public static class QueryableAsyncExtensions
@@ -23,7 +23,7 @@ public static async Task<List<TSource>> ToListAsync<TSource>(this IQueryable<TSo
 
             var value = await provider.ExecuteAsync(source.Expression, token);
 
-            return (List<TSource>)value;
+            return (List<TSource>)value!;
         }
 
         public static Task<TSource[]> ToArrayAsync<TSource>(this IQueryable<TSource> source) => source.ToArrayAsync(CancellationToken.None);
@@ -33,16 +33,16 @@ public static async Task<TSource[]> ToArrayAsync<TSource>(this IQueryable<TSourc
 
             var value = await provider.ExecuteAsync(source.Expression, token);
 
-            return ((List<TSource>)value).ToArray();
+            return ((List<TSource>)value!).ToArray();
         }
 
         static async Task<R> Bind<R>(CancellationToken cancellationToken, Expression<Func<R>> bind)
         {
             var mce = (MethodCallExpression)bind.Body;
 
-            IQueryable query = (IQueryable)ExpressionEvaluator.Eval(mce.Arguments.FirstEx());
+            IQueryable query = (IQueryable)ExpressionEvaluator.Eval(mce.Arguments.FirstEx())!;
 
-            List<Expression> otherExpressions = mce.Arguments.Skip(1).Select(a => (Expression)ExpressionEvaluator.Eval(a)).ToList();
+            List<Expression> otherExpressions = mce.Arguments.Skip(1).Select(a => (Expression)ExpressionEvaluator.Eval(a)!).ToList();
 
             var mc2 = Expression.Call(mce.Method, otherExpressions.PreAnd(query.Expression));
 
diff --git a/Signum.Utilities/Extensions/ArgsExtensions.cs b/Signum.Utilities/Extensions/ArgsExtensions.cs
index d72badf7b2..135dc7dbf4 100644
--- a/Signum.Utilities/Extensions/ArgsExtensions.cs
+++ b/Signum.Utilities/Extensions/ArgsExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
@@ -9,18 +9,18 @@ namespace Signum.Utilities
 {
     public static class ArgsExtensions
     {
-        public static T GetArg<T>(this IEnumerable<object> args)
+        public static T GetArg<T>(this IEnumerable<object>? args)
         {
             return args.SmartConvertTo<T>().SingleEx(() => "{0} in the argument list".FormatWith(typeof(T))); ;
         }
 
-        public static T TryGetArgC<T>(this IEnumerable<object> args) where T : class
+        public static T TryGetArgC<T>(this IEnumerable<object>? args) where T : class
         {
             return args.SmartConvertTo<T>().SingleOrDefaultEx(
                 () => "There are more than one {0} in the argument list".FormatWith(typeof(T)));
         }
 
-        public static T? TryGetArgS<T>(this IEnumerable<object> args) where T : struct
+        public static T? TryGetArgS<T>(this IEnumerable<object>? args) where T : struct
         {
             var casted = args.SmartConvertTo<T>();
 
@@ -30,7 +30,7 @@ public static T TryGetArgC<T>(this IEnumerable<object> args) where T : class
             return casted.SingleEx(() => "{0} in the argument list".FormatWith(typeof(T)));
         }
 
-        static IEnumerable<T> SmartConvertTo<T>(this IEnumerable<object> args)
+        static IEnumerable<T> SmartConvertTo<T>(this IEnumerable<object>? args)
         {
             if (args == null)
                 yield break;
@@ -50,7 +50,7 @@ static IEnumerable<T> SmartConvertTo<T>(this IEnumerable<object> args)
                     yield return ReflectionTools.ChangeType<T>(obj);
                 }
                 else if (obj is List<object> list)
-                    yield return (T)giConvertListTo.GetInvoker(typeof(T).ElementType())(list);
+                    yield return (T)giConvertListTo.GetInvoker(typeof(T).ElementType()!)(list);
             }
         }
 
diff --git a/Signum.Utilities/Extensions/ColorExtensions.cs b/Signum.Utilities/Extensions/ColorExtensions.cs
index 1e0b473fd1..3c943daa1a 100644
--- a/Signum.Utilities/Extensions/ColorExtensions.cs
+++ b/Signum.Utilities/Extensions/ColorExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Drawing;
 using System.Globalization;
 
@@ -22,7 +22,7 @@ public static string ToHtml(this Color color)
             return ToHtmlColor(color.ToArgb());
         }
 
-        public static string TryToHtml(this Color? color)
+        public static string? TryToHtml(this Color? color)
         {
             if (color == null)
                 return null;
@@ -145,8 +145,8 @@ public static Color FromHex(string hex)
 
         public static void FromHex(string hex, out byte a, out byte r, out byte g, out byte b)
         {
-            hex = ToRgbaHex(hex);
-            if (hex == null || !uint.TryParse(hex, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var packedValue))
+            var nhex = ToRgbaHex(hex);
+            if (nhex == null || !uint.TryParse(nhex, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var packedValue))
             {
                 throw new ArgumentException("Hexadecimal string is not in the correct format.", nameof(hex));
             }
@@ -157,7 +157,7 @@ public static void FromHex(string hex, out byte a, out byte r, out byte g, out b
             b = (byte)(packedValue >> 8);
         }
 
-        private static string ToRgbaHex(string hex)
+        private static string? ToRgbaHex(string hex)
         {
             hex = hex.StartsWith("#") ? hex.Substring(1) : hex;
 
diff --git a/Signum.Utilities/Extensions/DateTimeExtensions.cs b/Signum.Utilities/Extensions/DateTimeExtensions.cs
index d92f5856e3..4360bf2a25 100644
--- a/Signum.Utilities/Extensions/DateTimeExtensions.cs
+++ b/Signum.Utilities/Extensions/DateTimeExtensions.cs
@@ -524,7 +524,7 @@ public DateSpan Invert()
 
         public override string ToString()
         {
-            string result = ", ".CombineIfNotEmpty(
+            string result = ", ".Combine(
                          Years == 0 ? null :
                          Years == 1 ? DateTimeMessage._0Year.NiceToString().FormatWith(Years) :
                                      DateTimeMessage._0Years.NiceToString().FormatWith(Years),
diff --git a/Signum.Utilities/Extensions/EnumExtensions.cs b/Signum.Utilities/Extensions/EnumExtensions.cs
index aad1cb602d..c12622e9fe 100644
--- a/Signum.Utilities/Extensions/EnumExtensions.cs
+++ b/Signum.Utilities/Extensions/EnumExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
@@ -90,7 +90,7 @@ public static bool TryParse(string value, Type enumType, bool ignoreCase, out En
         {
             if (!Enum.IsDefined(enumType, value) && !int.TryParse(value, out int rubish))
             {
-                result = null;
+                result = null!;
                 return false;
             }
             result = (Enum)Enum.Parse(enumType, value);
diff --git a/Signum.Utilities/Extensions/EnumerableExtensions.cs b/Signum.Utilities/Extensions/EnumerableExtensions.cs
index e54f876e11..312f2d95f1 100644
--- a/Signum.Utilities/Extensions/EnumerableExtensions.cs
+++ b/Signum.Utilities/Extensions/EnumerableExtensions.cs
@@ -11,6 +11,7 @@
 using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;
+using System.Runtime.CompilerServices;
 using System.Text;
 
 namespace Signum.Utilities
@@ -399,12 +400,12 @@ public Expression Expand(Expression instance, Expression[] arguments, MethodInfo
             }
         }
 
-        public static bool IsNullOrEmpty<T>(this IEnumerable<T>? collection)
+        public static bool IsNullOrEmpty<T>([NotNullWhenFalse]this IEnumerable<T>? collection)
         {
             return collection == null || collection.IsEmpty();
         }
 
-        public static bool HasItems<T>(this IEnumerable<T>? collection)
+        public static bool HasItems<T>([NotNullWhenTrue]this IEnumerable<T>? collection)
         {
             return collection != null && collection.Any();
         }
@@ -904,8 +905,7 @@ public static IEnumerable<S> BiSelectC<T, S>(this IEnumerable<T> collection, Fun
             {
                 if (!enumerator.MoveNext())
                     yield break;
-
-
+                
                 T firstItem = enumerator.Current;
                 if (options == BiSelectOptions.Initial || options == BiSelectOptions.InitialAndFinal)
                     yield return func(null, firstItem);
diff --git a/Signum.Utilities/Extensions/Extensions.cs b/Signum.Utilities/Extensions/Extensions.cs
index df9b9c7ba4..d307374667 100644
--- a/Signum.Utilities/Extensions/Extensions.cs
+++ b/Signum.Utilities/Extensions/Extensions.cs
@@ -4,6 +4,7 @@
 using System.Diagnostics;
 using System.Globalization;
 using System.Linq;
+using System.Runtime.CompilerServices;
 using System.Runtime.Serialization;
 using System.Web;
 
@@ -261,7 +262,7 @@ public static int NotFound(this int value, int defaultValue)
             return value == -1 ? defaultValue : value;
         }
 
-        public static T ThrowIfNull<T>(this T? t, string message)
+        public static T ThrowIfNull<T>([EnsuresNotNull]this T? t, string message)
          where T : struct
         {
             if (t == null)
@@ -269,7 +270,7 @@ public static T ThrowIfNull<T>(this T? t, string message)
             return t.Value;
         }
 
-        public static T ThrowIfNull<T>(this T t, string message)
+        public static T ThrowIfNull<T>([EnsuresNotNull]this T t, string message)
             where T : class
         {
             if (t == null)
@@ -278,7 +279,7 @@ public static T ThrowIfNull<T>(this T t, string message)
         }
 
 
-        public static T ThrowIfNull<T>(this T? t, Func<string> message)
+        public static T ThrowIfNull<T>([EnsuresNotNull]this T? t, Func<string> message)
          where T : struct
         {
             if (t == null)
@@ -286,7 +287,7 @@ public static T ThrowIfNull<T>(this T? t, Func<string> message)
             return t.Value;
         }
 
-        public static T ThrowIfNull<T>(this T t, Func<string> message)
+        public static T ThrowIfNull<T>([EnsuresNotNull]this T? t, Func<string> message)
             where T : class
         {
             if (t == null)
diff --git a/Signum.Utilities/Extensions/GroupExtensions.cs b/Signum.Utilities/Extensions/GroupExtensions.cs
index 17886d1046..3436374174 100644
--- a/Signum.Utilities/Extensions/GroupExtensions.cs
+++ b/Signum.Utilities/Extensions/GroupExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities.DataStructures;
@@ -21,7 +21,7 @@ public static Dictionary<K, V> GroupDistinctToDictionary<T, K, V>(this IEnumerab
                 .ToDictionaryEx(g => g.Key, g => g.Distinct().AssertSingle(g.Key));
         }
 
-        public static T AssertSingle<T>(this IEnumerable<T> collection, object key)
+        public static T AssertSingle<T>(this IEnumerable<T> collection, object? key)
         {
             int c = collection.Count();
             if (c == 0) throw new InvalidOperationException("No element exists with key '{0}'".FormatWith(key));
@@ -184,7 +184,7 @@ public static IEnumerable<IntervalWithEnd<T>> IntervalsOf<T>(this IEnumerable<T>
         public static List<IGrouping<T, T>> GroupWhen<T>(this IEnumerable<T> collection, Func<T, bool> isGroupKey, bool includeKeyInGroup = false, bool initialGroup = false)
         {
             List<IGrouping<T, T>> result = new List<IGrouping<T, T>>();
-            Grouping<T, T> group = null;
+            Grouping<T, T>? group = null;
             foreach (var item in collection)
             {
                 if (isGroupKey(item))
@@ -201,7 +201,7 @@ public static List<IGrouping<T, T>> GroupWhen<T>(this IEnumerable<T> collection,
                         if(!initialGroup)
                             throw new InvalidOperationException("Parameter initialGroup is false");
 
-                        group = new Grouping<T, T>(default(T));
+                        group = new Grouping<T, T>(default(T)!);
                         result.Add(group);
                     }
 
@@ -214,7 +214,7 @@ public static List<IGrouping<T, T>> GroupWhen<T>(this IEnumerable<T> collection,
 
         public static IEnumerable<IGrouping<K, T>> GroupWhenChange<T, K>(this IEnumerable<T> collection, Func<T, K> getGroupKey)
         {
-            Grouping<K, T> current = null;
+            Grouping<K, T>? current = null;
 
             foreach (var item in collection)
             {
@@ -225,7 +225,7 @@ public static IEnumerable<IGrouping<K, T>> GroupWhenChange<T, K>(this IEnumerabl
                         item
                     };
                 }
-                else if (current.Key.Equals(getGroupKey(item)))
+                else if (object.Equals(current.Key, getGroupKey(item)))
                 {
                     current.Add(item);
                 }
diff --git a/Signum.Utilities/Extensions/ReflectionExtensions.cs b/Signum.Utilities/Extensions/ReflectionExtensions.cs
index a001965b7c..bc00e7d943 100644
--- a/Signum.Utilities/Extensions/ReflectionExtensions.cs
+++ b/Signum.Utilities/Extensions/ReflectionExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
@@ -38,11 +38,12 @@ public static bool IsAnonymous(this Type type)
 
         public static Type ReturningType(this MemberInfo m)
         {
-            return (m is PropertyInfo) ? ((PropertyInfo)m).PropertyType :
-                (m is FieldInfo) ? ((FieldInfo)m).FieldType :
-                (m is MethodInfo) ? ((MethodInfo)m).ReturnType :
-                (m is ConstructorInfo) ? ((ConstructorInfo)m).DeclaringType :
-                (m is EventInfo) ? ((EventInfo)m).EventHandlerType : null;
+            return (m is PropertyInfo pi) ? pi.PropertyType :
+                (m is FieldInfo fi) ? fi.FieldType :
+                (m is MethodInfo mi) ? mi.ReturnType :
+                (m is ConstructorInfo ci) ? ci.DeclaringType :
+                (m is EventInfo ei) ? ei.EventHandlerType :
+                 throw new UnexpectedValueException(m! /*CSBUG*/);
         }
 
         public static bool HasAttribute<T>(this ICustomAttributeProvider mi) where T : Attribute
@@ -93,7 +94,7 @@ public static bool IsReadOnly(this PropertyInfo pi)
             return mi == null || !mi.IsPublic;
         }
 
-        public static Type ElementType(this Type ft)
+        public static Type? ElementType(this Type ft)
         {
             if (!typeof(IEnumerable).IsAssignableFrom(ft))
                 return null;
@@ -108,7 +109,7 @@ public static bool IsExtensionMethod(this MethodInfo m)
             return m.IsStatic && m.HasAttribute<ExtensionAttribute>();
         }
 
-        public static PropertyInfo GetBaseDefinition(this PropertyInfo propertyInfo)
+        public static PropertyInfo? GetBaseDefinition(this PropertyInfo propertyInfo)
         {
             var method = propertyInfo.GetAccessors(true)[0];
             if (method == null)
@@ -142,7 +143,7 @@ public static DateTime CompilationDate(this Assembly assembly)
                 const int c_PeHeaderOffset = 60;
                 const int c_LinkerTimestampOffset = 8;
                 byte[] b = new byte[2048];
-                System.IO.Stream s = null;
+                System.IO.Stream? s = null;
 
                 try
                 {
diff --git a/Signum.Utilities/Extensions/RegexExtensions.cs b/Signum.Utilities/Extensions/RegexExtensions.cs
index 5b80f409fb..b36766a9b0 100644
--- a/Signum.Utilities/Extensions/RegexExtensions.cs
+++ b/Signum.Utilities/Extensions/RegexExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.RegularExpressions;
@@ -41,7 +41,11 @@ public static T MostSimilar<T>(this IEnumerable<T> collection, Func<T, string> s
         }
 
         public static IEnumerable<R> JoinSimilar<T, S, R>(this List<T> outer, List<S> inner,
-            Func<T, string> outerKeySelector, Func<S, string> innerKeySelector, Func<T, S, int, R> resultSelector)
+            Func<T, string> outerKeySelector, 
+            Func<S, string> innerKeySelector, 
+            Func<T, S, int, R> resultSelector)
+            where T : object
+            where S : object
         {
             StringDistance sd = new StringDistance();
             Dictionary<Tuple<T, S>, int> distances = (from o in outer
@@ -61,7 +65,7 @@ select KVP.Create(Tuple.Create(o, i),
             }
         }
 
-        public static IEnumerable<(Match match, string after)> SplitAfter(this Regex regex, string input)
+        public static IEnumerable<(Match? match, string after)> SplitAfter(this Regex regex, string input)
         {
             var matches = regex.Matches(input).Cast<Match>().ToList();
 
diff --git a/Signum.Utilities/Extensions/StringExtensions.cs b/Signum.Utilities/Extensions/StringExtensions.cs
index eb1a42c015..638c65c019 100644
--- a/Signum.Utilities/Extensions/StringExtensions.cs
+++ b/Signum.Utilities/Extensions/StringExtensions.cs
@@ -11,14 +11,18 @@ namespace Signum.Utilities
 {
     public static class StringExtensions
     {
+#pragma warning disable IDE0052 // Remove unread private members
         static readonly Expression<Func<string, bool>> HasTextExpression = str => (str ?? "").Length > 0;
+#pragma warning restore IDE0052 // Remove unread private members
         [ExpressionField("HasTextExpression")]
         public static bool HasText(this string? str)
         {
             return !string.IsNullOrEmpty(str);
         }
 
+#pragma warning disable IDE0052 // Remove unread private members
         static readonly Expression<Func<string, string, string>> DefaultTextExpression = (a, b) => ((a ?? "").Length > 0) ? a : b;
+#pragma warning restore IDE0052 // Remove unread private members
         [ExpressionField("DefaultTextExpression")]
         public static string DefaultText(this string? str, string defaultText)
         {
@@ -41,17 +45,17 @@ public static bool Contains(this string source, string toCheck, StringComparison
             return source.IndexOf(toCheck, comp) >= 0;
         }
 
-        public static string? Add(this string? str, string separator, string? part)
+        public static string Add(this string? str, string separator, string? part)
         {
             if (str.HasText())
             {
                 if (part.HasText())
                     return str + separator + part;
                 else
-                    return str;
+                    return str ?? "";
             }
             else
-                return part;
+                return part ?? "";
         }
 
         public static string? AddLine(this string? str, string part)
@@ -710,7 +714,7 @@ public static bool Wildcards(this string fileName, IEnumerable<string> wildcards
             return wildcards.Any(wc => fileName.Wildcards(wc));
         }
 
-        static Dictionary<string, string> wildcardsPatterns = new Dictionary<string, string>();
+        static readonly Dictionary<string, string> wildcardsPatterns = new Dictionary<string, string>();
         public static bool Wildcards(this string fileName, string wildcard)
         {
             var pattern = wildcardsPatterns.GetOrCreate(wildcard, wildcard.Replace(".", "[.]").Replace("*", ".*").Replace("?", "."));
@@ -749,8 +753,8 @@ public static string ToComputerSize(this long value)
             return ToComputerSize(value, false);
         }
 
-        static string[] abbreviations = new[] { "Bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };
-        static string[] magnitudes = new[] { "Bytes", "KBytes", "MBytes", "GBytes", "TBytes", "PBytes", "EBytes", "ZBytes", "YBytes" };
+        static readonly string[] abbreviations = new[] { "Bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };
+        static readonly string[] magnitudes = new[] { "Bytes", "KBytes", "MBytes", "GBytes", "TBytes", "PBytes", "EBytes", "ZBytes", "YBytes" };
         public static string ToComputerSize(this long value, bool useAbbreviations)
         {
             double valor = value;
@@ -760,27 +764,8 @@ public static string ToComputerSize(this long value, bool useAbbreviations)
 
             return "{0:#,###.00} {1}".FormatWith(valor, (useAbbreviations ? abbreviations : magnitudes)[i]);
         }
-
-        public static string Combine(this string separator, params object[] elements)
-        {
-            StringBuilder? sb = null;
-            foreach (var item in elements)
-            {
-                if (item != null)
-                {
-                    if (sb == null)
-                        sb = new StringBuilder();
-                    else
-                        sb.Append(separator);
-
-                    sb.Append(item.ToString());
-                }
-            }
-
-            return sb == null ? "" : sb.ToString();  // Remove at the end is faster
-        }
-
-        public static string CombineIfNotEmpty(this string separator, params object?[] elements)
+        
+        public static string Combine(this string separator, params object?[] elements)
         {
             StringBuilder? sb = null;
             foreach (var item in elements)
diff --git a/Signum.Utilities/Extensions/StringExtensions.md b/Signum.Utilities/Extensions/StringExtensions.md
index be63bfebe6..9ed5493ffe 100644
--- a/Signum.Utilities/Extensions/StringExtensions.md
+++ b/Signum.Utilities/Extensions/StringExtensions.md
@@ -463,20 +463,20 @@ It's useful for code generation, like C# or SQL statements:
 //  Address
 //FROM Customers
 ```
-### Combine / CombineIfNotEmpty
+### Combine / Combine
 
 Given a separator `this`, combines a sequence of string `params` writing the separator in between.
 
 ```C#
 public static string Combine(this string separator, params object[] elements)
-public static string CombineIfNotEmpty(this string separator, params object[] elements)
+public static string Combine(this string separator, params object[] elements)
 ```
 
-CombineIfNotEmpty ignores null or empty elements.
+Combine ignores null or empty elements.
 
 ```C#
 ",".Combine(0, null, "", "hola"); //returns 0,,,hola
-",".CombineIfNotEmpty(0, null, "", "hola"); //returns 0,hola
+",".Combine(0, null, "", "hola"); //returns 0,hola
 ```
 
 ### ToComputerSize
diff --git a/Signum.Utilities/Extensions/TimeSpanExtensions.cs b/Signum.Utilities/Extensions/TimeSpanExtensions.cs
index df885fd0f4..3aac177b5e 100644
--- a/Signum.Utilities/Extensions/TimeSpanExtensions.cs
+++ b/Signum.Utilities/Extensions/TimeSpanExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Text;
 
 namespace Signum.Utilities
diff --git a/Signum.Utilities/Extensions/TreeHelper.cs b/Signum.Utilities/Extensions/TreeHelper.cs
index 6d7d94ef65..6e09b5e3b8 100644
--- a/Signum.Utilities/Extensions/TreeHelper.cs
+++ b/Signum.Utilities/Extensions/TreeHelper.cs
@@ -15,16 +15,16 @@ public static ObservableCollection<Node<T>> ToTreeC<T>(IEnumerable<T> collection
 
             Dictionary<T, Node<T>> dic = new Dictionary<T, Node<T>>();
 
-            Func<T, Node<T>> createNode = null;
+            Func<T, Node<T>> createNode = null!;
 
             createNode = item => dic.GetOrCreate(item, () =>
-                {
-                    Node<T> itemNode = new Node<T>(item);
-                    T parent = getParent(item);
-                    Node<T> parentNode = parent != null ? createNode(parent) : top;
-                    parentNode.Children.Add(itemNode);
-                    return itemNode;
-                });
+            {
+                Node<T> itemNode = new Node<T>(item);
+                T parent = getParent(item);
+                Node<T> parentNode = parent != null ? createNode(parent) : top;
+                parentNode.Children.Add(itemNode);
+                return itemNode;
+            });
 
             foreach (var item in collection)
             {
@@ -41,7 +41,7 @@ public static ObservableCollection<Node<T>> ToTreeS<T>(IEnumerable<T> collection
 
             Dictionary<T, Node<T>> dic = new Dictionary<T, Node<T>>();
 
-            Func<T, Node<T>> createNode = null;
+            Func<T, Node<T>> createNode = null!;
 
             createNode = item => dic.GetOrCreate(item, () =>
             {
@@ -84,7 +84,7 @@ public static IEnumerable<T> DepthFirst<T>(T root, Func<T, IEnumerable<T>> child
             }
         }
 
-        public static ObservableCollection<Node<S>> SelectTree<T, S>(ObservableCollection<Node<T>> nodes, Func<T, S> selector)
+        public static ObservableCollection<Node<S>>? SelectTree<T, S>(ObservableCollection<Node<T>> nodes, Func<T, S> selector)
         {
             return nodes.Select(n => new Node<S>(selector(n.Value), SelectTree(n.Children, selector))).ToObservableCollection();
         }
@@ -123,7 +123,7 @@ public static ObservableCollection<Node<S>> SelectSimplifyTreeS<T, S>(Observable
             return result;
         }
 
-        public static ObservableCollection<Node<T>> Apply<T>(ObservableCollection<Node<T>> collection, Func<ObservableCollection<Node<T>>, ObservableCollection<Node<T>>> action)
+        public static ObservableCollection<Node<T>>? Apply<T>(ObservableCollection<Node<T>> collection, Func<ObservableCollection<Node<T>>, ObservableCollection<Node<T>>> action)
         {
             return action(collection).Select(a => new Node<T>(a.Value, Apply(a.Children, action))).ToObservableCollection();
         }
@@ -134,7 +134,7 @@ public class Node<T> : INotifyPropertyChanged
         public T Value { get; set; }
         public ObservableCollection<Node<T>> Children { get; set; }
 
-        public Node(T value, ObservableCollection<Node<T>> children)
+        public Node(T value, ObservableCollection<Node<T>>? children)
         {
             Value = value;
             Children = children ?? new ObservableCollection<Node<T>>();
diff --git a/Signum.Utilities/NaturalLanguage/German.cs b/Signum.Utilities/NaturalLanguage/German.cs
index a1d4918fde..395689da41 100644
--- a/Signum.Utilities/NaturalLanguage/German.cs
+++ b/Signum.Utilities/NaturalLanguage/German.cs
@@ -7,7 +7,7 @@ namespace Signum.Utilities.NaturalLanguage
     public class GermanPluralizer : IPluralizer
     {
         //http://www.alemansencillo.com/el-plural-en-aleman#TOC-Reglas-generales-aplicables-a-todos
-        Dictionary<string, string> terminationsFemenine = new Dictionary<string, string>
+        readonly Dictionary<string, string> terminationsFemenine = new Dictionary<string, string>
         {
             {"itis", "itiden"},
             {"sis", "sen"},
@@ -18,8 +18,7 @@ public class GermanPluralizer : IPluralizer
             {"a", "en"},
             {"", "en"},
         };
-
-        Dictionary<string, string> terminationsMasculine = new Dictionary<string, string>
+        readonly Dictionary<string, string> terminationsMasculine = new Dictionary<string, string>
         {
             {"ant", "anten"},
             {"ent", "enten"},
@@ -29,8 +28,7 @@ public class GermanPluralizer : IPluralizer
             {"e", "en"},
             {"", "e"},
         };
-
-        Dictionary<string, string> terminationsNeutro = new Dictionary<string, string>
+        readonly Dictionary<string, string> terminationsNeutro = new Dictionary<string, string>
         {
             {"nis", "nisse"},
             {"um", "a"},
@@ -44,7 +42,7 @@ public string MakePlural(string singularName)
             if (string.IsNullOrEmpty(singularName))
                 return singularName;
 
-            string last = singularName.TryAfterLast(' ');
+            string? last = singularName.TryAfterLast(' ');
             if (last != null)
                 return singularName.BeforeLast(' ') + " " + MakePlural(last);
 
@@ -67,7 +65,7 @@ public string MakePlural(string singularName)
 
     public class GermanGenderDetector : IGenderDetector
     {
-        Dictionary<string, char> terminations = new Dictionary<string, char>
+        readonly Dictionary<string, char> terminations = new Dictionary<string, char>
         {
             //http://www.alemansencillo.com/genero-de-los-sustantivos-masculinos
             {"ich", 'm' },
@@ -136,18 +134,13 @@ public class GermanGenderDetector : IGenderDetector
 
             return null;
         }
-        
-        ReadOnlyCollection<PronomInfo> pronoms = new ReadOnlyCollection<PronomInfo>(new[]
+
+        public ReadOnlyCollection<PronomInfo> Pronoms { get; } = new ReadOnlyCollection<PronomInfo>(new[]
         {
             new PronomInfo('m', "der", "die"),
             new PronomInfo('f', "die", "die"),
             new PronomInfo('n', "das", "die"),
         });
-
-        public ReadOnlyCollection<PronomInfo> Pronoms
-        {
-            get { return pronoms; }
-        }
     }
 
 
diff --git a/Signum.Utilities/NaturalLanguage/Spanish.cs b/Signum.Utilities/NaturalLanguage/Spanish.cs
index 9fa3e77728..fa0824c215 100644
--- a/Signum.Utilities/NaturalLanguage/Spanish.cs
+++ b/Signum.Utilities/NaturalLanguage/Spanish.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq;
@@ -129,9 +129,9 @@ public string ToNumber(decimal number, NumberWriterSettings settings)
                 settings.UnitGender == 'f' ? (bool?)true :
                 settings.UnitGender == 'm' ? (bool?)false : null;
 
- 	        string signo = null;
-            string integerPart = null;
-            string decimalPart = null;
+ 	        string? signo = null;
+            string? integerPart = null;
+            string? decimalPart = null;
 
             if (number < 0)
             {
@@ -161,7 +161,7 @@ public string ToNumber(decimal number, NumberWriterSettings settings)
         }
         private static string ConvertNumber(long num, bool? femenine, string singular, string plural)
         {
-            string result = null;
+            string? result = null;
             long numAux = num;
             for (int i = 0; numAux > 0; i++, numAux /= 1000)
                 result = " ".Combine(ConvertTrio((int)(numAux % 1000), i, femenine), " ", result);
@@ -173,7 +173,7 @@ private static string ConvertNumber(long num, bool? femenine, string singular, s
             return separator.Combine(result ?? "cero", numMod1M == 1 ? singular : plural);
         }
 
-        static string ConvertTrio(int val, int group, bool? femenine)
+        static string? ConvertTrio(int val, int group, bool? femenine)
         {
             string trio = val.ToString("000");
 
@@ -184,14 +184,14 @@ static string ConvertTrio(int val, int group, bool? femenine)
             if (cent == 0 && dec == 0 && unit == 0 && group % 2 == 1)
                 return null;
 
-            string groupName = UnitsGroup(group, unit != 1 || dec > 0 || cent > 0);
+            string? groupName = UnitsGroup(group, unit != 1 || dec > 0 || cent > 0);
 
             string num = CentsDecsUnits(cent, dec, unit, group >= 2 ? null : femenine);
 
             return " ".Combine(val == 1 && groupName == "mil" ? null : num, groupName);
         }
 
-        static string UnitsGroup(int numGroup, bool plural)
+        static string? UnitsGroup(int numGroup, bool plural)
         {
             //en función de la cantidad de elementos que haya en enteros tendremos los
             //billones, millones, unidades...
@@ -252,7 +252,7 @@ static string DecsUnits(int decena, int unit, bool? femenine)
             }
         }
 
-        static string Units(int num, bool? femenine)
+        static string? Units(int num, bool? femenine)
         {
             switch (num)
             {
@@ -272,7 +272,7 @@ static string Units(int num, bool? femenine)
             }
         }
 
-        static string Decs(int num)
+        static string? Decs(int num)
         {
             switch (num)
             {
@@ -290,7 +290,7 @@ static string Decs(int num)
             }
         }
 
-        static string Cents(int num, bool femenine)
+        static string? Cents(int num, bool femenine)
         {
             switch (num)
             {
diff --git a/Signum.Utilities/NotNullAttributes.cs b/Signum.Utilities/NotNullAttributes.cs
new file mode 100644
index 0000000000..038a2f56d4
--- /dev/null
+++ b/Signum.Utilities/NotNullAttributes.cs
@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+
+namespace System.Runtime.CompilerServices
+{
+    [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false)]
+    public class AssertsTrueAttribute : Attribute
+    {
+        public AssertsTrueAttribute() { }
+    }
+    [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false)]
+    public class AssertsFalseAttribute : Attribute
+    {
+        public AssertsFalseAttribute() { }
+    }
+    [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false)]
+    public class EnsuresNotNullAttribute : Attribute
+    {
+        public EnsuresNotNullAttribute() { }
+    }
+    [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false)]
+    public class NotNullWhenFalseAttribute : Attribute
+    {
+        public NotNullWhenFalseAttribute() { }
+    }
+    [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false)]
+    public class NotNullWhenTrueAttribute : Attribute
+    {
+        public NotNullWhenTrueAttribute() { }
+    }
+}
diff --git a/Signum.Utilities/ProgressProxy.cs b/Signum.Utilities/ProgressProxy.cs
index 57ebe9809b..ed7cc94d47 100644
--- a/Signum.Utilities/ProgressProxy.cs
+++ b/Signum.Utilities/ProgressProxy.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace Signum.Utilities
 {
@@ -6,7 +6,7 @@ public class ProgressProxy
     {
         const int numUpdates = 10000;
 
-        private string currentTask;
+        private string? currentTask;
 
         private int min;
         private int max;
@@ -42,7 +42,7 @@ public int Position
             }
         }
 
-        public string CurrentTask
+        public string? CurrentTask
         {
             get { return currentTask; }
         }
diff --git a/Signum.Utilities/Reflection/ReflectionTools.cs b/Signum.Utilities/Reflection/ReflectionTools.cs
index 41fa4da332..89921a4441 100644
--- a/Signum.Utilities/Reflection/ReflectionTools.cs
+++ b/Signum.Utilities/Reflection/ReflectionTools.cs
@@ -103,8 +103,7 @@ public static ConstructorInfo BaseConstuctorInfo(LambdaExpression constuctor)
             if (body.NodeType == ExpressionType.Convert)
                 body = ((UnaryExpression)body).Operand;
 
-            NewExpression? ex = body as NewExpression;
-            if (ex == null)
+            if (!(body is NewExpression ex))
                 throw new ArgumentException("The lambda 'constuctor' should be an expression constructing an object");
 
             return ex.Constructor;
@@ -288,9 +287,7 @@ public static Type GetReceiverType<T, R>(Expression<Func<T, R>> lambda)
                 return (Action<T, object?>)exp.Compile();
             }
         }
-
-        static Module module = ((Expression<Func<int>>)(() => 2)).Compile().Method.Module;
-
+        
         public static Action<object, object?>? CreateSetterUntyped(Type type, MemberInfo m)
         {
             using (HeavyProfiler.LogNoStackTrace("CreateSetterUntyped"))
@@ -463,13 +460,13 @@ public static T Parse<T>(string value, CultureInfo culture)
                 return (T)Convert.ChangeType(value, utype, culture);
         }
 
-        public static object Parse(string value, Type type, CultureInfo culture)
+        public static object? Parse(string value, Type type, CultureInfo culture)
         {
             if (type == typeof(string))
-                return (object)value;
+                return value;
 
             if (value == null || value == "")
-                return (object?)null;
+                return null;
 
             Type utype = type.UnNullify();
             if (utype.IsEnum)
@@ -489,7 +486,7 @@ public static bool TryParse<T>(string value, out T result)
             }
             else
             {
-                result = default(T);
+                result = default(T)!;
                 return false;
             }
         }
@@ -503,7 +500,7 @@ public static bool TryParse<T>(string value,  CultureInfo ci, out T result)
             }
             else
             {
-                result = default(T);
+                result = default(T)!;
                 return false;
             }
         }
diff --git a/Signum.Utilities/Reflection/TupleExtensions.cs b/Signum.Utilities/Reflection/TupleExtensions.cs
index 0458cc7bd6..4696ec5cef 100644
--- a/Signum.Utilities/Reflection/TupleExtensions.cs
+++ b/Signum.Utilities/Reflection/TupleExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
@@ -31,7 +31,7 @@ public static Type TupleOf(int numParameters)
                 case 6: return typeof(Tuple<,,,,,>);
                 case 7: return typeof(Tuple<,,,,,,>);
                 case 8: return typeof(Tuple<,,,,,,,>);
-                default: return null;
+                default: throw new UnexpectedValueException(numParameters);
             }
         }
 
diff --git a/Signum.Utilities/Statics.cs b/Signum.Utilities/Statics.cs
index 10d2eb62bf..0eb566994d 100644
--- a/Signum.Utilities/Statics.cs
+++ b/Signum.Utilities/Statics.cs
@@ -158,7 +158,7 @@ public override void Clean()
 
     public abstract class SessionVariable<T>: Variable<T>
     {
-        public abstract Func<T>? ValueFactory { get; set; }
+        public Func<T> ValueFactory { get; set; }
 
         protected internal SessionVariable(string name)
             : base(name)
@@ -191,7 +191,7 @@ public SessionVariable<T> CreateVariable<T>(string name)
 
         class VoidVariable<T> : SessionVariable<T>
         {
-            public override Func<T>? ValueFactory { get; set; }
+            //public override Func<T> ValueFactory { get; set; }
 
             public VoidVariable(string name)
                 : base(name)
@@ -227,7 +227,7 @@ public SessionVariable<T> CreateVariable<T>(string name)
 
         class SingletonVariable<T> : SessionVariable<T>
         {
-            public override Func<T>? ValueFactory { get; set; }
+            //public override Func<T> ValueFactory { get; set; }
 
             public SingletonVariable(string name)
                 : base(name)
@@ -297,11 +297,12 @@ public OverrideableVariable(SessionVariable<T> variable)
                 this.variable = variable;
             }
 
-            public override Func<T>? ValueFactory
-            {
-                get { return variable.ValueFactory; }
-                set { variable.ValueFactory = value; }
-            }
+            /*CSBUG*/
+            //public override Func<T> ValueFactory
+            //{
+            //    get { return variable.ValueFactory; }
+            //    set { variable.ValueFactory = value; }
+            //}
 
             public override T Value
             {
diff --git a/Signum.Utilities/Synchronization/ThreadSafeEnumerator.cs b/Signum.Utilities/Synchronization/ThreadSafeEnumerator.cs
index eb9bbcc9be..d3587812ce 100644
--- a/Signum.Utilities/Synchronization/ThreadSafeEnumerator.cs
+++ b/Signum.Utilities/Synchronization/ThreadSafeEnumerator.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Collections;
 using System.Threading;
@@ -34,7 +34,7 @@ public T Current
             get { return current.Value; }
         }
 
-        object IEnumerator.Current
+        object? IEnumerator.Current
         {
             get { return current.Value; }
         }
@@ -46,7 +46,7 @@ public bool MoveNext()
                 if (moveNext && (moveNext = enumerator.MoveNext()))
                     current.Value = enumerator.Current;
                 else
-                    current.Value = default(T);
+                    current.Value = default(T)!;
 
                 return moveNext; 
             }
diff --git a/Signum.Utilities/Tsv.cs b/Signum.Utilities/Tsv.cs
index c41f1fabcd..eb2751b323 100644
--- a/Signum.Utilities/Tsv.cs
+++ b/Signum.Utilities/Tsv.cs
@@ -102,7 +102,7 @@ public static void ToTsv<T>(this IEnumerable<T> collection, Stream stream, Encod
                     {
                         for (int i = 0; i < members.Count; i++)
                         {
-                            var obj = members[i].Getter(item);
+                            var obj = members[i].Getter!(item);
 
                             var str = toString[i](obj);
 
@@ -197,7 +197,7 @@ static string HandleSpaces(string p)
                     {
                         e.Data["row"] = line;
 
-                        if (defOptions.SkipError == null || !options.SkipError(e, tsvLine))
+                        if (defOptions.SkipError?.Invoke(e, tsvLine) != true)
                             throw new ParseCsvException(e);
                     }
 
@@ -247,7 +247,7 @@ public static T ReadLine<T>(string tsvLine, TsvReadOptions<T>? options = null)
                 {
                     str = vals[i];
                     object? val = parsers[i](str);
-                    members[i].Setter(t, val);
+                    members[i].Setter!(t, val);
                 }
                 catch (Exception e)
                 {

From 06ef8e83be801baef9d5135a966233cfff8acf3f Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Thu, 24 Jan 2019 22:59:44 +0100
Subject: [PATCH 10/25] more on nullables

---
 .../CodeGeneration/LogicCodeGenerator.cs      |  2 +-
 Signum.Engine/Connection/FieldReader.cs       | 17 +++++-----
 Signum.Engine/GlobalLazy.cs                   |  6 ++--
 .../ExpressionVisitor/GroupEntityCleaner.cs   |  6 ++--
 .../Linq/ExpressionVisitor/OrderByRewriter.cs | 33 +++++++++----------
 Signum.Engine/Linq/Meta/MetaEvaluator.cs      | 16 +++++----
 Signum.Engine/Linq/Meta/MetadataVisitor.cs    | 21 +++++-------
 7 files changed, 49 insertions(+), 52 deletions(-)

diff --git a/Signum.Engine/CodeGeneration/LogicCodeGenerator.cs b/Signum.Engine/CodeGeneration/LogicCodeGenerator.cs
index b58f51cc8c..ccdfaa62e1 100644
--- a/Signum.Engine/CodeGeneration/LogicCodeGenerator.cs
+++ b/Signum.Engine/CodeGeneration/LogicCodeGenerator.cs
@@ -424,7 +424,7 @@ protected virtual string GetWithVirtualMList(Type type, PropertyInfo p, Property
             if (!pi.HasAttribute<IgnoreAttribute>())
                 return null;
 
-            var t = pi.PropertyType.ElementType();
+            var t = pi.PropertyType.ElementType()!;
 
             var backProperty = Reflector.PublicInstancePropertiesInOrder(t).SingleOrDefaultEx(bp => IsVirtualMListBackReference(bp, pi.DeclaringType));
 
diff --git a/Signum.Engine/Connection/FieldReader.cs b/Signum.Engine/Connection/FieldReader.cs
index 92b1aeb482..16e10a199f 100644
--- a/Signum.Engine/Connection/FieldReader.cs
+++ b/Signum.Engine/Connection/FieldReader.cs
@@ -566,12 +566,11 @@ public static Expression GetIsNull(Expression reader, int ordinal)
 
         internal FieldReaderException CreateFieldReaderException(Exception ex)
         {
-            return new FieldReaderException(ex)
-            {
-                Ordinal = LastOrdinal,
-                ColumnName = reader.GetName(LastOrdinal),
-                ColumnType = reader.GetFieldType(LastOrdinal),
-            };
+            return new FieldReaderException(ex, 
+                ordinal:  LastOrdinal,
+                columnName: reader.GetName(LastOrdinal),
+                columnType: reader.GetFieldType(LastOrdinal)
+            );
         }
     }
 
@@ -583,8 +582,10 @@ public FieldReaderException(Exception inner, int ordinal, string columnName, Typ
             this.Ordinal = ordinal;
             this.ColumnName = columnName;
             this.ColumnType = columnType;
-        }
-        protected FieldReaderException(
+        }
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
+        protected FieldReaderException(
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
           System.Runtime.Serialization.SerializationInfo info,
           System.Runtime.Serialization.StreamingContext context)
             : base(info, context) { }
diff --git a/Signum.Engine/GlobalLazy.cs b/Signum.Engine/GlobalLazy.cs
index 1833ea90fd..51bae85fdb 100644
--- a/Signum.Engine/GlobalLazy.cs
+++ b/Signum.Engine/GlobalLazy.cs
@@ -1,4 +1,4 @@
-using Signum.Utilities;
+using Signum.Utilities;
 using Signum.Utilities.ExpressionTrees;
 using System;
 using System.Collections.Generic;
@@ -38,7 +38,7 @@ public InvalidateWith(params Type[] types)
 
     public static class GlobalLazy
     {
-        static HashSet<IResetLazy> registeredLazyList = new HashSet<IResetLazy>();
+        static readonly HashSet<IResetLazy> registeredLazyList = new HashSet<IResetLazy>();
         public static List<ResetLazyStats> Statistics()
         {
             return registeredLazyList.Select(a => a.Stats()).OrderByDescending(x=>x.SumLoadTime).ToList();
@@ -51,7 +51,7 @@ public static ResetLazy<T> WithoutInvalidations<T>(Func<T> func, LazyThreadSafet
             {
                 using (ExecutionMode.Global())
                 using (HeavyProfiler.Log("ResetLazy", () => typeof(T).TypeName()))
-                using (Transaction tr = Transaction.InTestTransaction ? null : Transaction.ForceNew())
+                using (Transaction? tr = Transaction.InTestTransaction ? null : Transaction.ForceNew())
                 using (new EntityCache(EntityCacheType.ForceNewSealed))
                 {
                     var value = func();
diff --git a/Signum.Engine/Linq/ExpressionVisitor/GroupEntityCleaner.cs b/Signum.Engine/Linq/ExpressionVisitor/GroupEntityCleaner.cs
index 76327dffbe..395318e8b6 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/GroupEntityCleaner.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/GroupEntityCleaner.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq.Expressions;
 
 namespace Signum.Engine.Linq
@@ -14,7 +14,7 @@ public static Expression Clean(Expression source)
         public override Expression Visit(Expression exp)
         {
             if (exp == null)
-                return null;
+                return null!;
 
             if (exp.Type == typeof(Type))
                 return VisitType(exp);
@@ -59,7 +59,7 @@ protected internal override Expression VisitLiteReference(LiteReferenceExpressio
         public override Expression Visit(Expression exp)
         {
             if (exp == null)
-                return null;
+                return null!;
 
             if (exp.Type == typeof(Type))
                 return VisitType(exp);
diff --git a/Signum.Engine/Linq/ExpressionVisitor/OrderByRewriter.cs b/Signum.Engine/Linq/ExpressionVisitor/OrderByRewriter.cs
index 0cfeb55646..b8cf9ac3fd 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/OrderByRewriter.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/OrderByRewriter.cs
@@ -1,4 +1,4 @@
-using Signum.Entities.DynamicQuery;
+using Signum.Entities.DynamicQuery;
 using Signum.Utilities;
 using System;
 using System.Collections.Generic;
@@ -10,9 +10,9 @@ namespace Signum.Engine.Linq
 {
     internal class OrderByRewriter : DbExpressionVisitor
     {
-        List<ColumnExpression> gatheredKeys;
-        ReadOnlyCollection<OrderExpression> gatheredOrderings;
-        SelectExpression outerMostSelect;
+        List<ColumnExpression>? gatheredKeys;
+        ReadOnlyCollection<OrderExpression>? gatheredOrderings;
+        SelectExpression? outerMostSelect;
         bool hasProjectionInProjector;
 
         private OrderByRewriter() { }
@@ -73,7 +73,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
                     gatheredKeys = new List<ColumnExpression>();
             }
 
-            List<ColumnExpression> savedKeys = null;
+            List<ColumnExpression>? savedKeys = null;
             if (gatheredKeys != null && (select.IsDistinct || select.GroupBy.HasItems() || select.IsAllAggregates))
                 savedKeys = gatheredKeys.ToList();
 
@@ -82,7 +82,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
             if (savedKeys != null)
                 gatheredKeys = savedKeys;
 
-            List<ColumnDeclaration> newColumns = null;
+            List<ColumnDeclaration>? newColumns = null;
 
             if (select.GroupBy.HasItems())
             {
@@ -96,7 +96,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
 
                     foreach (var ge in select.GroupBy)
                     {
-                        var cd = cg.Columns.FirstOrDefault(a => DbExpressionComparer.AreEqual(a.Expression, ge));
+                        var cd = cg.Columns.NotNull().FirstOrDefault(a => DbExpressionComparer.AreEqual(a.Expression, ge));
 
                         if (cd != null)
                             newKeys.Add(cd);
@@ -105,7 +105,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
                     }
 
                     if (cg.Columns.Count() != select.Columns.Count)
-                        newColumns = cg.Columns.ToList();
+                        newColumns = cg.Columns.NotNull().ToList();
 
                     gatheredKeys.AddRange(newKeys.Select(cd => new ColumnExpression(cd.Expression.Type, select.Alias, cd.Name)));
                 }
@@ -137,7 +137,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
             if (select.OrderBy.Count > 0)
                 this.PrependOrderings(select.OrderBy);
 
-            ReadOnlyCollection<OrderExpression> orderings = null;
+            ReadOnlyCollection<OrderExpression>? orderings = null;
 
             if (isOuterMost && !IsCountSumOrAvg(select) || select.Top != null)
             {
@@ -150,7 +150,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
             if (AreEqual(select.OrderBy, orderings) && !select.IsReverse && newColumns == null)
                 return select;
 
-            return new SelectExpression(select.Alias, select.IsDistinct, select.Top, (IEnumerable<ColumnDeclaration>)newColumns ?? select.Columns,
+            return new SelectExpression(select.Alias, select.IsDistinct, select.Top, (IEnumerable<ColumnDeclaration>?)newColumns ?? select.Columns,
                 select.From, select.Where, orderings, select.GroupBy, select.SelectOptions & ~SelectOptions.Reverse);
         }
 
@@ -164,7 +164,7 @@ protected internal override Expression VisitRowNumber(RowNumberExpression rowNum
 
         protected internal override Expression VisitScalar(ScalarExpression scalar)
         {
-            if (!scalar.Select.IsForXmlPathEmpty)
+            if (!scalar.Select!.IsForXmlPathEmpty)
             {
                 using (Scope())
                     return base.VisitScalar(scalar);
@@ -174,7 +174,7 @@ protected internal override Expression VisitScalar(ScalarExpression scalar)
                 using (Scope())
                 {
                     var oldOuterMostSelect = outerMostSelect;
-                    outerMostSelect = scalar.Select;
+                    outerMostSelect = scalar.Select!;
 
                     var result = base.VisitScalar(scalar);
                     outerMostSelect = oldOuterMostSelect;
@@ -199,7 +199,7 @@ protected internal override Expression VisitIn(InExpression @in)
                     return base.VisitIn(@in);
         }
 
-        static bool AreEqual(IEnumerable<OrderExpression> col1, IEnumerable<OrderExpression> col2)
+        static bool AreEqual(IEnumerable<OrderExpression>? col1, IEnumerable<OrderExpression>? col2)
         {
             bool col1Empty = col1 == null || col1.IsEmpty();
             bool col2Empty = col2 == null || col2.IsEmpty();
@@ -231,8 +231,7 @@ private bool IsCountSumOrAvg(SelectExpression select)
                     exp = ((BinaryExpression)exp).Left;
             }
 
-            AggregateExpression aggExp = exp as AggregateExpression;
-            if (aggExp == null)
+            if (!(exp is AggregateExpression aggExp))
                 return false;
 
             return aggExp.AggregateFunction == AggregateSqlFunction.Count ||
@@ -246,7 +245,7 @@ protected internal override Expression VisitJoin(JoinExpression join)
         {
             SourceExpression left = this.VisitSource(join.Left);
 
-            ReadOnlyCollection<OrderExpression> leftOrders = this.gatheredOrderings;
+            ReadOnlyCollection<OrderExpression>? leftOrders = this.gatheredOrderings;
             this.gatheredOrderings = null;
 
             SourceExpression right = join.Right is TableExpression ? join.Right : this.VisitSource(join.Right);
@@ -302,7 +301,7 @@ static Expression CleanCast(Expression exp)
             return exp;
         }
 
-        protected void PrependOrderings(ReadOnlyCollection<OrderExpression> newOrderings)
+        protected void PrependOrderings(ReadOnlyCollection<OrderExpression>? newOrderings)
         {
             if (!newOrderings.IsNullOrEmpty())
             {
diff --git a/Signum.Engine/Linq/Meta/MetaEvaluator.cs b/Signum.Engine/Linq/Meta/MetaEvaluator.cs
index 925bed0d55..8985f6af0a 100644
--- a/Signum.Engine/Linq/Meta/MetaEvaluator.cs
+++ b/Signum.Engine/Linq/Meta/MetaEvaluator.cs
@@ -21,8 +21,11 @@ public class MetaEvaluator : ExpressionVisitor
         }
 
         HashSet<Expression> candidates;
-
-        private MetaEvaluator() { }
+        
+        public MetaEvaluator(HashSet<Expression> candidates)
+        {
+            this.candidates = candidates;
+        }
 
         /// <summary>
         /// Performs evaluation & replacement of independent sub-trees
@@ -32,15 +35,14 @@ private MetaEvaluator() { }
         /// <returns>A new tree with sub-trees evaluated and replaced.</returns>
         public static Expression PartialEval(Expression exp)
         {
-            return new MetaEvaluator { candidates = ExpressionNominator.Nominate(exp) }.Visit(exp);
+            return new MetaEvaluator(candidates: ExpressionNominator.Nominate(exp)).Visit(exp);
         }
 
-        public override Expression? Visit(Expression exp)
+        public override Expression Visit(Expression exp)
         {
             if (exp == null)
-            {
-                return null;
-            }
+                return null!;
+
             if (this.candidates.Contains(exp) && exp.NodeType != ExpressionType.Constant)
             {
                 if (exp.Type.IsInstantiationOf(typeof(IQueryable<>)))
diff --git a/Signum.Engine/Linq/Meta/MetadataVisitor.cs b/Signum.Engine/Linq/Meta/MetadataVisitor.cs
index 400fbfef51..392ab931ee 100644
--- a/Signum.Engine/Linq/Meta/MetadataVisitor.cs
+++ b/Signum.Engine/Linq/Meta/MetadataVisitor.cs
@@ -24,7 +24,7 @@ internal class MetadataVisitor : ExpressionVisitor
 
         private MetadataVisitor() { }
 
-        static internal Dictionary<string, Meta?> GatherMetadata(Expression expression)
+        static internal Dictionary<string, Meta?>? GatherMetadata(Expression expression)
         {
             if (expression == null)
                 throw new ArgumentException("expression");
@@ -572,19 +572,16 @@ protected override Expression VisitBinary(BinaryExpression b)
         {
             var right = Visit(b.Right);
             var left = Visit(b.Left);
-
-            var mRight = right as MetaExpression;
-            var mLeft = left as MetaExpression;
-
+            
             Implementations? imps =
-                mRight != null && mRight.Meta.Implementations != null &&
-                mLeft != null && mLeft.Meta.Implementations != null ?
+                right is MetaExpression mRight && mRight.Meta.Implementations != null &&
+                left is MetaExpression mLeft && mLeft.Meta.Implementations != null ?
                 AggregateImplementations(new[] {
                     mRight.Meta.Implementations.Value,
                     mLeft.Meta.Implementations.Value }) :
                 (Implementations?)null;
 
-            return MakeDirtyMeta(b.Type, imps, left, right);
+            return MakeDirtyMeta(b.Type, imps, left!, right!); /*CSBUG*/
         }
 
         protected override Expression VisitConditional(ConditionalExpression c)
@@ -592,18 +589,16 @@ protected override Expression VisitConditional(ConditionalExpression c)
             var ifTrue = Visit(c.IfTrue);
             var ifFalse = Visit(c.IfFalse);
 
-            var mIfTrue = ifTrue as MetaExpression;
-            var mIfFalse = ifFalse as MetaExpression;
 
             Implementations? imps =
-                mIfTrue != null && mIfTrue.Meta.Implementations != null &&
-                mIfFalse != null && mIfFalse.Meta.Implementations != null ?
+                ifTrue is MetaExpression mIfTrue && mIfTrue.Meta.Implementations != null &&
+                ifFalse is MetaExpression mIfFalse && mIfFalse.Meta.Implementations != null ?
                 AggregateImplementations(new[] {
                     mIfTrue.Meta.Implementations.Value,
                     mIfFalse.Meta.Implementations.Value }) :
                 (Implementations?)null;
 
-            return MakeDirtyMeta(c.Type, imps, Visit(c.Test), ifTrue, ifFalse);
+            return MakeDirtyMeta(c.Type, imps, Visit(c.Test), ifTrue!, ifFalse!); /*CSBUG*/
         }
     }
 }

From c8a0be6defa949025eb479efb545e3a86215ef8b Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Sat, 26 Jan 2019 10:50:04 +0100
Subject: [PATCH 11/25] Signum.Engine not nullable

---
 Signum.Engine/Basics/PropertyRouteLogic.cs    |  8 +--
 Signum.Engine/Basics/QueryLogic.cs            |  8 +--
 Signum.Engine/Basics/SemiSymbolLogic.cs       | 16 ++---
 Signum.Engine/Basics/SymbolLogic.cs           | 10 ++--
 Signum.Engine/CodeGeneration/CodeGenerator.cs |  2 +-
 .../CodeGeneration/ReactCodeGenerator.cs      | 31 +++++-----
 Signum.Engine/Connection/SqlConnector.cs      |  8 +--
 Signum.Engine/Database.cs                     | 16 ++---
 .../DynamicQuery/ExpressionContainer.cs       |  4 +-
 Signum.Engine/Engine/Saver.cs                 |  2 +-
 Signum.Engine/Engine/SchemaGenerator.cs       | 34 +++++------
 Signum.Engine/Engine/SchemaSynchronizer.cs    |  4 +-
 Signum.Engine/Engine/SqlBuilder.cs            |  6 +-
 Signum.Engine/Engine/SqlUtils.cs              |  8 +--
 Signum.Engine/Linq/DbExpressions.Signum.cs    |  4 +-
 .../DbExpressionNominator.cs                  |  2 +-
 .../OverloadingSimplifier.cs                  |  6 +-
 .../Linq/ExpressionVisitor/QueryFilterer.cs   | 10 ++--
 .../Linq/ExpressionVisitor/QueryFormatter.cs  |  4 +-
 .../Linq/ExpressionVisitor/QueryRebinder.cs   | 18 +++---
 .../RedundantSubqueryRemover.cs               | 38 ++++++------
 .../Linq/ExpressionVisitor/SmartEqualizer.cs  | 58 +++++++++----------
 .../ExpressionVisitor/UnusedColumnRemover.cs  | 12 ++--
 Signum.Engine/Linq/Meta/MetaExpression.cs     |  4 +-
 Signum.Engine/Linq/Meta/MetadataVisitor.cs    | 10 ++--
 Signum.Engine/Linq/ProjectionReader.cs        | 15 ++---
 Signum.Engine/Patterns/VirtualMList.cs        |  8 +--
 Signum.Engine/Schema/Schema.Basics.cs         |  4 +-
 Signum.Engine/Schema/Schema.Delete.cs         |  6 +-
 Signum.Engine/Schema/Schema.Save.cs           | 14 ++---
 Signum.Engine/Schema/Schema.cs                |  4 +-
 Signum.Engine/Schema/SchemaAssets.cs          | 55 +++++++++---------
 .../Schema/SchemaBuilder/SchemaBuilder.cs     |  8 +--
 .../SchemaBuilder/SchemaBuilderSettings.cs    |  2 +-
 Signum.Engine/Schema/UniqueIndex.cs           | 20 ++++---
 Signum.Engine/Signum.Engine.csproj            |  6 +-
 Signum.Entities/Basics/OperationLog.cs        |  2 +
 Signum.Entities/DynamicQuery/QueryUtils.cs    |  2 +-
 .../DynamicQuery/Tokens/NetPropertyToken.cs   |  4 +-
 Signum.Entities/MList.cs                      |  2 +-
 Signum.Entities/ModifiableEntity.cs           |  2 +
 Signum.Entities/ObjectDumper.cs               |  6 +-
 .../EntityStructuralEqualityComparer.cs       |  4 +-
 Signum.Entities/Reflection/GraphExplorer.cs   |  4 +-
 Signum.Entities/Reflection/Reflector.cs       |  2 +-
 Signum.Entities/Signum.Entities.csproj        |  6 +-
 Signum.Utilities/ConsoleSwitch.cs             |  8 ++-
 .../DataStructures/ImmutableStack.cs          |  3 -
 .../IntervalDictionaries/Interval.cs          |  2 +
 .../IntervalDictionary.cs                     | 11 +++-
 .../ExpressionTrees/CSharpRenderer.cs         |  5 +-
 Signum.Utilities/ExpressionTrees/Query.cs     |  2 +-
 .../QueryableAsyncExtensions.cs               |  2 +-
 Signum.Utilities/Extensions/Extensions.cs     |  2 +-
 .../Extensions/ReflectionExtensions.cs        |  2 +-
 .../Extensions/StringExtensions.cs            | 13 ++---
 Signum.Utilities/Polymorphic.cs               | 10 ++++
 Signum.Utilities/Profiler/HeavyProfiler.cs    |  2 +-
 .../Reflection/ReflectionTools.cs             | 10 ++--
 Signum.Utilities/Signum.Utilities.csproj      |  2 +-
 Signum.Utilities/Statics.cs                   | 33 +++++------
 .../Synchronization/CultureInfoUtils.cs       |  2 +-
 Signum.Utilities/Synchronization/ResetLazy.cs |  2 +-
 63 files changed, 310 insertions(+), 300 deletions(-)

diff --git a/Signum.Engine/Basics/PropertyRouteLogic.cs b/Signum.Engine/Basics/PropertyRouteLogic.cs
index 59e54621d9..40acbd3fb7 100644
--- a/Signum.Engine/Basics/PropertyRouteLogic.cs
+++ b/Signum.Engine/Basics/PropertyRouteLogic.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Entities.Basics;
@@ -40,7 +40,7 @@ public static void Start(SchemaBuilder sb)
             }
         }
 
-        private static SqlPreCommand PropertyRouteLogic_PreDeleteSqlSync(Entity arg)
+        private static SqlPreCommand? PropertyRouteLogic_PreDeleteSqlSync(Entity arg)
         {
             Table table = Schema.Current.Table<PropertyRouteEntity>();
 
@@ -51,13 +51,13 @@ private static SqlPreCommand PropertyRouteLogic_PreDeleteSqlSync(Entity arg)
             return prs.Select(pr => table.DeleteSqlSync(pr, p => p.RootType.CleanName == pr.RootType.CleanName && p.Path == pr.Path)).Combine(Spacing.Simple);
         }
 
-        public static PropertyRouteEntity TryGetPropertyRouteEntity(TypeEntity entity, string path)
+        public static PropertyRouteEntity? TryGetPropertyRouteEntity(TypeEntity entity, string path)
         {
             return Properties.Value.TryGetC(entity)?.TryGetC(path);
         }
 
         public const string PropertiesFor = "Properties For:{0}";
-        static SqlPreCommand SynchronizeProperties(Replacements rep)
+        static SqlPreCommand? SynchronizeProperties(Replacements rep)
         {
             var current = Administrator.TryRetrieveAll<PropertyRouteEntity>(rep).AgGroupToDictionary(a => a.RootType.CleanName, g => g.ToDictionaryEx(f => f.Path, "PropertyEntity in the database with path"));
 
diff --git a/Signum.Engine/Basics/QueryLogic.cs b/Signum.Engine/Basics/QueryLogic.cs
index 098bd87b52..4968ad0d97 100644
--- a/Signum.Engine/Basics/QueryLogic.cs
+++ b/Signum.Engine/Basics/QueryLogic.cs
@@ -104,7 +104,7 @@ public static object ToQueryName(string queryKey)
             return QueryNames.GetOrThrow(queryKey, "QueryName with unique name {0} not found");
         }
 
-        public static object TryToQueryName(string queryKey)
+        public static object? TryToQueryName(string queryKey)
         {
             return QueryNames.TryGetC(queryKey);
         }
@@ -133,17 +133,17 @@ public static List<QueryEntity> GetTypeQueries(TypeEntity typeEntity)
 
         public const string QueriesKey = "Queries";
 
-        static SqlPreCommand Schema_Generating()
+        static SqlPreCommand? Schema_Generating()
         {
             Table table = Schema.Current.Table<QueryEntity>();
 
             var should = GenerateQueries();
 
-            return should.Select((q, i) => table.InsertSqlSync(q, suffix: i.ToString())).Combine(Spacing.Simple).PlainSqlCommand();
+            return should.Select((q, i) => table.InsertSqlSync(q, suffix: i.ToString())).Combine(Spacing.Simple)?.PlainSqlCommand();
 
         }
 
-        static SqlPreCommand SynchronizeQueries(Replacements replacements)
+        static SqlPreCommand? SynchronizeQueries(Replacements replacements)
         {
             var should = GenerateQueries();
 
diff --git a/Signum.Engine/Basics/SemiSymbolLogic.cs b/Signum.Engine/Basics/SemiSymbolLogic.cs
index 94bc4cede0..63c5a73c71 100644
--- a/Signum.Engine/Basics/SemiSymbolLogic.cs
+++ b/Signum.Engine/Basics/SemiSymbolLogic.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Engine.Maps;
@@ -49,8 +49,8 @@ public static void Start(SchemaBuilder sb, Func<IEnumerable<T>> getSemiSymbols)
                           (c, s) => { s.SetIdAndProps(c); return s; },
                           "caching " + typeof(T).Name);
 
-                        SemiSymbol.SetFromDatabase<T>(current.ToDictionary(a => a.Key));
-                        return result.ToDictionary(a => a.Key);
+                        SemiSymbol.SetFromDatabase<T>(current.ToDictionary(a => a.Key!));
+                        return result.ToDictionary(a => a.Key!);
                     }
                 },
                 new InvalidateWith(typeof(T)),
@@ -74,7 +74,7 @@ static void SymbolLogic_Retrieved(T ident)
                 }
         }
 
-        static SqlPreCommand Schema_Generating()
+        static SqlPreCommand? Schema_Generating()
         {
             Table table = Schema.Current.Table<T>();
 
@@ -89,12 +89,12 @@ private static IEnumerable<T> CreateSemiSymbols()
 
             using (CultureInfoUtils.ChangeCulture(Schema.Current.ForceCultureInfo))
                 foreach (var item in should)
-                    item.Name = item.NiceToString();
+                    item.Name = item.NiceToString()!;
 
             return should;
         }
 
-        static SqlPreCommand Schema_Synchronizing(Replacements replacements)
+        static SqlPreCommand? Schema_Synchronizing(Replacements replacements)
         {
             Table table = Schema.Current.Table<T>();
 
@@ -103,8 +103,8 @@ static SqlPreCommand Schema_Synchronizing(Replacements replacements)
 
             using (replacements.WithReplacedDatabaseName())
                 return Synchronizer.SynchronizeScriptReplacing(replacements, typeof(T).Name, Spacing.Double,
-                    should.ToDictionary(s => s.Key),
-                    current.Where(c => c.Key.HasText()).ToDictionary(c => c.Key),
+                    should.ToDictionary(s => s.Key!),
+                    current.Where(c => c.Key.HasText()).ToDictionary(c => c.Key!),
                     createNew: (k, s) => table.InsertSqlSync(s),
                     removeOld: (k, c) => table.DeleteSqlSync(c, s => s.Key == c.Key),
                     mergeBoth: (k, s, c) =>
diff --git a/Signum.Engine/Basics/SymbolLogic.cs b/Signum.Engine/Basics/SymbolLogic.cs
index 29d3528939..ee27736c57 100644
--- a/Signum.Engine/Basics/SymbolLogic.cs
+++ b/Signum.Engine/Basics/SymbolLogic.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Engine.Maps;
@@ -93,16 +93,16 @@ static void SymbolLogic_Retrieved(T ident)
                 }
         }
 
-        static SqlPreCommand Schema_Generating()
+        static SqlPreCommand? Schema_Generating()
         {
             Table table = Schema.Current.Table<T>();
 
             IEnumerable<T> should = getSymbols();
 
-            return should.Select((a, i) => table.InsertSqlSync(a, suffix: i.ToString())).Combine(Spacing.Simple).PlainSqlCommand();
+            return should.Select((a, i) => table.InsertSqlSync(a, suffix: i.ToString())).Combine(Spacing.Simple)?.PlainSqlCommand();
         }
 
-        static SqlPreCommand Schema_Synchronizing(Replacements replacements)
+        static SqlPreCommand? Schema_Synchronizing(Replacements replacements)
         {
             Table table = Schema.Current.Table<T>();
 
@@ -136,7 +136,7 @@ public static ICollection<T> Symbols
             get { return AssertStarted().Values; }
         }
 
-        public static T TryToSymbol(string key)
+        public static T? TryToSymbol(string key)
         {
             return AssertStarted().TryGetC(key);
         }
diff --git a/Signum.Engine/CodeGeneration/CodeGenerator.cs b/Signum.Engine/CodeGeneration/CodeGenerator.cs
index c97c2e15cf..5f9535fb4e 100644
--- a/Signum.Engine/CodeGeneration/CodeGenerator.cs
+++ b/Signum.Engine/CodeGeneration/CodeGenerator.cs
@@ -63,7 +63,7 @@ public static IEnumerable<Module> GetModules(Dictionary<Type, bool> types, strin
                 if (selected.IsNullOrEmpty())
                     yield break;
 
-                string? moduleName = GetDefaultModuleName(selected, solutionName);
+                string moduleName = GetDefaultModuleName(selected, solutionName)!;
                 SafeConsole.WriteColor(ConsoleColor.Gray, $"Module name? ([Enter] for '{moduleName}'):");
 
                 moduleName = Console.ReadLine().DefaultText(moduleName!);
diff --git a/Signum.Engine/CodeGeneration/ReactCodeGenerator.cs b/Signum.Engine/CodeGeneration/ReactCodeGenerator.cs
index 0417aa19d6..69e1b04433 100644
--- a/Signum.Engine/CodeGeneration/ReactCodeGenerator.cs
+++ b/Signum.Engine/CodeGeneration/ReactCodeGenerator.cs
@@ -15,10 +15,10 @@ namespace Signum.Engine.CodeGeneration
 {
     public class ReactCodeGenerator
     {
-        public string SolutionName;
-        public string SolutionFolder;
+        public string SolutionName = null!;
+        public string SolutionFolder = null!;
 
-        public Schema CurrentSchema;
+        public Schema CurrentSchema = null!;
 
         public virtual void GenerateReactFromEntities()
         {
@@ -73,7 +73,7 @@ public virtual void GenerateReactFromEntities()
             }
         }
 
-        protected virtual void WriteFile(Func<string> getContent, Func<string> getFileName, ref bool? overwriteFiles)
+        protected virtual void WriteFile(Func<string?> getContent, Func<string> getFileName, ref bool? overwriteFiles)
         {
             var content = getContent();
             if (content == null)
@@ -82,7 +82,6 @@ protected virtual void WriteFile(Func<string> getContent, Func<string> getFileNa
 
             var fileName = getFileName();
 
-
             FileTools.CreateParentDirectory(fileName);
             if (!File.Exists(fileName) || SafeConsole.Ask(ref overwriteFiles, "Overwrite {0}?".FormatWith(fileName)))
                 File.WriteAllText(fileName, content, Encoding.UTF8);
@@ -150,7 +149,7 @@ public IEnumerable<Module> ReactGetModules(Dictionary<Type, bool> types, string
 
                 var directories = Directory.GetDirectories(GetProjectFolder(), "App\\").Select(a => Path.GetFileName(a));
 
-                string moduleName;
+                string? moduleName;
                 if (directories.IsEmpty())
                 {
                     moduleName = AskModuleName(solutionName, selectedTypes);
@@ -168,11 +167,7 @@ public IEnumerable<Module> ReactGetModules(Dictionary<Type, bool> types, string
                 if (!moduleName.HasText())
                     yield break;
 
-                yield return new Module
-                {
-                    ModuleName = moduleName,
-                    Types = selectedTypes.ToList()
-                };
+                yield return new Module(moduleName, selectedTypes.ToList());
 
                 types.SetRange(selectedTypes, a => a, a => true);
             }
@@ -181,10 +176,10 @@ public IEnumerable<Module> ReactGetModules(Dictionary<Type, bool> types, string
 
         private static string AskModuleName(string solutionName, Type[] selected)
         {
-            string moduleName = CodeGenerator.GetDefaultModuleName(selected, solutionName);
+            string? moduleName = CodeGenerator.GetDefaultModuleName(selected, solutionName);
             SafeConsole.WriteColor(ConsoleColor.Gray, $"Module name? ([Enter] for '{moduleName}'):");
 
-            moduleName = Console.ReadLine().DefaultText(moduleName);
+            moduleName = Console.ReadLine().DefaultText(moduleName!);
             return moduleName;
         }
 
@@ -195,7 +190,7 @@ protected virtual List<Type> CandidateTypes()
             return assembly.GetTypes().Where(t => t.IsModifiableEntity() && !t.IsAbstract && !typeof(MixinEntity).IsAssignableFrom(t)).ToList();
         }
 
-        protected virtual string WriteServerFile(Module mod)
+        protected virtual string? WriteServerFile(Module mod)
         {
             if (!ShouldWriteServerFile(mod))
                 return null;
@@ -248,7 +243,7 @@ protected virtual string WriteServerStartMethod(Module mod)
         }
 
 
-        protected virtual string WriteControllerFile(Module mod)
+        protected virtual string? WriteControllerFile(Module mod)
         {
             if (!ShouldWriteControllerFile(mod))
                 return null;
@@ -434,7 +429,7 @@ protected virtual string WriteEntityComponentFile(Type type)
 
             foreach (var pi in GetProperties(type))
             {
-                string prop = WriteProperty(pi, v);
+                string? prop = WriteProperty(pi, v);
                 if (prop != null)
                     sb.AppendLine(prop.Indent(8));
             }
@@ -447,7 +442,7 @@ protected virtual string WriteEntityComponentFile(Type type)
             return sb.ToString();
         }
 
-        protected virtual string WriteProperty(PropertyInfo pi, string v)
+        protected virtual string? WriteProperty(PropertyInfo pi, string v)
         {
             if (pi.PropertyType.IsLite() || pi.PropertyType.IsIEntity())
                 return WriteEntityProperty(pi, v);
@@ -466,7 +461,7 @@ protected virtual string WriteProperty(PropertyInfo pi, string v)
 
         protected virtual string WriteMListProperty(PropertyInfo pi, string v)
         {
-            var elementType = pi.PropertyType.ElementType().CleanType();
+            var elementType = pi.PropertyType.ElementType()!.CleanType();
 
             if (!(elementType.IsLite() || elementType.IsModifiableEntity()))
                 return $"{{ /* {pi.PropertyType.TypeName()} not supported */ }}";
diff --git a/Signum.Engine/Connection/SqlConnector.cs b/Signum.Engine/Connection/SqlConnector.cs
index e8293c8003..cb7dbfaf8e 100644
--- a/Signum.Engine/Connection/SqlConnector.cs
+++ b/Signum.Engine/Connection/SqlConnector.cs
@@ -134,8 +134,8 @@ SqlCommand NewCommand(SqlPreCommandSimple preCommand, SqlConnection? overridenCo
                 cmd.Connection = overridenConnection;
             else
             {
-                cmd.Connection = (SqlConnection)Transaction.CurrentConnection;
-                cmd.Transaction = (SqlTransaction)Transaction.CurrentTransaccion;
+                cmd.Connection = (SqlConnection)Transaction.CurrentConnection!;
+                cmd.Transaction = (SqlTransaction)Transaction.CurrentTransaccion!;
             }
 
             cmd.CommandText = preCommand.Sql;
@@ -394,9 +394,9 @@ protected internal override void BulkCopy(DataTable dt, ObjectName destinationTa
         {
             using (SqlConnection? con = EnsureConnection())
             using (SqlBulkCopy bulkCopy = new SqlBulkCopy(
-                options.HasFlag(SqlBulkCopyOptions.UseInternalTransaction) ? con : (SqlConnection)Transaction.CurrentConnection,
+                options.HasFlag(SqlBulkCopyOptions.UseInternalTransaction) ? con : (SqlConnection)Transaction.CurrentConnection!,
                 options,
-                options.HasFlag(SqlBulkCopyOptions.UseInternalTransaction) ? null : (SqlTransaction)Transaction.CurrentTransaccion))
+                options.HasFlag(SqlBulkCopyOptions.UseInternalTransaction) ? null : (SqlTransaction)Transaction.CurrentTransaccion!))
             using (HeavyProfiler.Log("SQL", () => destinationTable.ToString() + " Rows:" + dt.Rows.Count))
             {
                 bulkCopy.BulkCopyTimeout = timeout ?? Connector.ScopeTimeout ?? this.CommandTimeout ?? bulkCopy.BulkCopyTimeout;
diff --git a/Signum.Engine/Database.cs b/Signum.Engine/Database.cs
index 46b0419365..3f2e460981 100644
--- a/Signum.Engine/Database.cs
+++ b/Signum.Engine/Database.cs
@@ -123,7 +123,7 @@ public static T Retrieve<T>(PrimaryKey id) where T : Entity
             {
                 if (EntityCache.Created)
                 {
-                    T cached = EntityCache.Get<T>(id);
+                    T? cached = EntityCache.Get<T>(id);
 
                     if (cached != null)
                         return cached;
@@ -143,7 +143,7 @@ public static T Retrieve<T>(PrimaryKey id) where T : Entity
                         using (new EntityCache())
                         using (var r = EntityCache.NewRetriever())
                         {
-                            result = r.Request<T>(id);
+                            result = r.Request<T>(id)!;
 
                             r.CompleteAll();
                         }
@@ -171,7 +171,7 @@ public static async Task<T> RetrieveAsync<T>(PrimaryKey id, CancellationToken to
             {
                 if (EntityCache.Created)
                 {
-                    T cached = EntityCache.Get<T>(id);
+                    T? cached = EntityCache.Get<T>(id);
 
                     if (cached != null)
                         return cached;
@@ -191,7 +191,7 @@ public static async Task<T> RetrieveAsync<T>(PrimaryKey id, CancellationToken to
                         using (new EntityCache())
                         using (var r = EntityCache.NewRetriever())
                         {
-                            result = r.Request<T>(id);
+                            result = r.Request<T>(id)!;
 
                             await r.CompleteAllAsync(token);
                         }
@@ -471,7 +471,7 @@ public static List<T> RetrieveAll<T>()
                             using (new EntityCache())
                             using (var r = EntityCache.NewRetriever())
                             {
-                                result = cc.GetAllIds().Select(id => r.Request<T>(id)).ToList();
+                                result = cc.GetAllIds().Select(id => r.Request<T>(id)!).ToList();
 
                                 r.CompleteAll();
                             }
@@ -510,7 +510,7 @@ public static async Task<List<T>> RetrieveAllAsync<T>(CancellationToken token)
                             using (new EntityCache())
                             using (var r = EntityCache.NewRetriever())
                             {
-                                result = cc.GetAllIds().Select(id => r.Request<T>(id)).ToList();
+                                result = cc.GetAllIds().Select(id => r.Request<T>(id)!).ToList();
 
                                 await r.CompleteAllAsync(token);
                             }
@@ -687,7 +687,7 @@ static List<T> RetrieveFromDatabaseOrCache<T>(List<PrimaryKey> ids, string? mess
                     using (new EntityCache())
                     using (var rr = EntityCache.NewRetriever())
                     {
-                        result = ids.Select(id => rr.Request<T>(id)).ToList();
+                        result = ids.Select(id => rr.Request<T>(id)!).ToList();
 
                         rr.CompleteAll();
                     }
@@ -781,7 +781,7 @@ static async Task<List<T>> RetrieveFromDatabaseOrCache<T>(List<PrimaryKey> ids,
                     using (new EntityCache())
                     using (var rr = EntityCache.NewRetriever())
                     {
-                        result = ids.Select(id => rr.Request<T>(id)).ToList();
+                        result = ids.Select(id => rr.Request<T>(id)!).ToList();
 
                         await rr.CompleteAllAsync(token);
                     }
diff --git a/Signum.Engine/DynamicQuery/ExpressionContainer.cs b/Signum.Engine/DynamicQuery/ExpressionContainer.cs
index 91dd05e6e9..b1b14776bf 100644
--- a/Signum.Engine/DynamicQuery/ExpressionContainer.cs
+++ b/Signum.Engine/DynamicQuery/ExpressionContainer.cs
@@ -212,7 +212,7 @@ public IEnumerable<QueryToken> GetAllTokens(QueryToken parent)
                     var cleanType = me!.Type.CleanType();
 
                     result.PropertyRoute = cm.PropertyRoutes.Only();
-                    result.Implementations = me!.Meta.Implementations;
+                    result.Implementations = me.Meta.Implementations;
                     result.Format = ColumnDescriptionFactory.GetFormat(cm.PropertyRoutes);
                     result.Unit = ColumnDescriptionFactory.GetUnit(cm.PropertyRoutes);
                 }
@@ -301,7 +301,7 @@ protected internal virtual ExtensionToken CreateToken(QueryToken parent)
                     result.Unit = dirtyMeta.CleanMetas.Select(cm => ColumnDescriptionFactory.GetUnit(cm.PropertyRoutes)).Distinct().Only();
                 }
 
-                result.IsAllowed = () => (me == null || me.Meta == null) ? null : me.Meta.IsAllowed();
+                result.IsAllowed = () => me?.Meta.IsAllowed();
 
                 if (ForcePropertyRoute != null)
                     result.PropertyRoute = ForcePropertyRoute!;
diff --git a/Signum.Engine/Engine/Saver.cs b/Signum.Engine/Engine/Saver.cs
index f71de66bd7..0581eeb4a6 100644
--- a/Signum.Engine/Engine/Saver.cs
+++ b/Signum.Engine/Engine/Saver.cs
@@ -83,7 +83,7 @@ public static void Save(Entity[] entities)
         private static void SaveGraph(Schema schema, DirectedGraph<Entity> identifiables)
         {
             //takes apart the 'forbidden' connections from the good ones
-            DirectedGraph<Entity> backEdges = identifiables.FeedbackEdgeSet();
+            DirectedGraph<Entity>? backEdges = identifiables.FeedbackEdgeSet();
 
             if (backEdges.IsEmpty())
                 backEdges = null;
diff --git a/Signum.Engine/Engine/SchemaGenerator.cs b/Signum.Engine/Engine/SchemaGenerator.cs
index 14c2774e32..ee89dc8b45 100644
--- a/Signum.Engine/Engine/SchemaGenerator.cs
+++ b/Signum.Engine/Engine/SchemaGenerator.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using Signum.Engine.Maps;
 using Signum.Utilities;
@@ -9,7 +9,7 @@ namespace Signum.Engine
 {
     public static class SchemaGenerator
     {
-        public static SqlPreCommand CreateSchemasScript()
+        public static SqlPreCommand? CreateSchemasScript()
         {
             Schema s = Schema.Current;
 
@@ -21,16 +21,16 @@ public static SqlPreCommand CreateSchemasScript()
                 .Combine(Spacing.Simple);
         }
 
-        public static SqlPreCommand CreateTablesScript()
+        public static SqlPreCommand? CreateTablesScript()
         {
             Schema s = Schema.Current;
             List<ITable> tables = s.GetDatabaseTables().Where(t => !s.IsExternalDatabase(t.Name.Schema.Database)).ToList();
 
-            SqlPreCommand createTables = tables.Select(SqlBuilder.CreateTableSql).Combine(Spacing.Double).PlainSqlCommand();
+            SqlPreCommand? createTables = tables.Select(SqlBuilder.CreateTableSql).Combine(Spacing.Double)?.PlainSqlCommand();
 
-            SqlPreCommand foreignKeys = tables.Select(SqlBuilder.AlterTableForeignKeys).Combine(Spacing.Double).PlainSqlCommand();
+            SqlPreCommand? foreignKeys = tables.Select(SqlBuilder.AlterTableForeignKeys).Combine(Spacing.Double)?.PlainSqlCommand();
 
-            SqlPreCommand indices = tables.Select(t =>
+            SqlPreCommand? indices = tables.Select(t =>
             {
                 var allIndexes = t.GeneratAllIndexes().Where(a => !(a is PrimaryClusteredIndex)); ;
 
@@ -41,23 +41,23 @@ public static SqlPreCommand CreateTablesScript()
 
                 return SqlPreCommand.Combine(Spacing.Double, mainIndices, historyIndices);
 
-            }).NotNull().Combine(Spacing.Double).PlainSqlCommand();
+            }).NotNull().Combine(Spacing.Double)?.PlainSqlCommand();
 
 
             return SqlPreCommand.Combine(Spacing.Triple, createTables, foreignKeys, indices);
         }
 
-        public static SqlPreCommand InsertEnumValuesScript()
+        public static SqlPreCommand? InsertEnumValuesScript()
         {
             return (from t in Schema.Current.Tables.Values
                     let enumType = EnumEntity.Extract(t.Type)
                     where enumType != null
                     select EnumEntity.GetEntities(enumType).Select((e, i) => t.InsertSqlSync(e, suffix: t.Name.Name + i)).Combine(Spacing.Simple)
-                    ).Combine(Spacing.Double).PlainSqlCommand();
+                    ).Combine(Spacing.Double)?.PlainSqlCommand();
         }
 
 
-        public static SqlPreCommand SnapshotIsolation()
+        public static SqlPreCommand? SnapshotIsolation()
         {
             if (!Connector.Current.AllowsSetSnapshotIsolation)
                 return null;
@@ -71,13 +71,13 @@ public static SqlPreCommand SnapshotIsolation()
                 list.Add(Connector.Current.DatabaseName());
             }
 
-            var cmd = list
+            var cmd = list.NotNull()
                 .Where(db => !SnapshotIsolationEnabled(db))
-                .Select(a => SqlPreCommand.Combine(Spacing.Simple,
-                    SqlBuilder.SetSingleUser(a),
-                    SqlBuilder.SetSnapshotIsolation(a, true),
-                    SqlBuilder.MakeSnapshotIsolationDefault(a, true),
-                    SqlBuilder.SetMultiUser(a))
+                .Select(db => SqlPreCommand.Combine(Spacing.Simple,
+                    SqlBuilder.SetSingleUser(db),
+                    SqlBuilder.SetSnapshotIsolation(db, true),
+                    SqlBuilder.MakeSnapshotIsolationDefault(db, true),
+                    SqlBuilder.SetMultiUser(db))
                 ).Combine(Spacing.Double);
 
             return cmd;
@@ -90,4 +90,4 @@ private static bool SnapshotIsolationEnabled(string dbName)
             return result;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Engine/Engine/SchemaSynchronizer.cs b/Signum.Engine/Engine/SchemaSynchronizer.cs
index 6d5cf261ba..d132c09c00 100644
--- a/Signum.Engine/Engine/SchemaSynchronizer.cs
+++ b/Signum.Engine/Engine/SchemaSynchronizer.cs
@@ -1055,7 +1055,7 @@ bool ColumnsChanged(DiffTable dif, Index mix)
             return true;
         }
 
-        private static bool IdenticalColumns(DiffTable dif, IColumn[] modColumns, List<DiffIndexColumn> diffColumns)
+        private static bool IdenticalColumns(DiffTable dif, IColumn[]? modColumns, List<DiffIndexColumn> diffColumns)
         {
             if ((modColumns?.Length ?? 0) != diffColumns.Count)
                 return false;
@@ -1065,7 +1065,7 @@ private static bool IdenticalColumns(DiffTable dif, IColumn[] modColumns, List<D
 
             var difColumns = diffColumns.Select(cn => dif.Columns.Values.SingleOrDefault(dc => dc.Name == cn.ColumnName)).ToList(); //Ny old name
 
-            var perfect = difColumns.ZipOrDefault(modColumns, (dc, mc) => dc != null && mc != null && dc.ColumnEquals(mc, ignorePrimaryKey: true, ignoreIdentity: true, ignoreGenerateAlways: true)).All(a => a);
+            var perfect = difColumns.ZipOrDefault(modColumns!, (dc, mc) => dc != null && mc != null && dc.ColumnEquals(mc, ignorePrimaryKey: true, ignoreIdentity: true, ignoreGenerateAlways: true)).All(a => a);
             return perfect;
         }
 
diff --git a/Signum.Engine/Engine/SqlBuilder.cs b/Signum.Engine/Engine/SqlBuilder.cs
index b126814b58..c132db966b 100644
--- a/Signum.Engine/Engine/SqlBuilder.cs
+++ b/Signum.Engine/Engine/SqlBuilder.cs
@@ -80,7 +80,7 @@ static SqlPreCommand DropViewIndex(ObjectName viewName, string index)
 
         public static SqlPreCommand AlterTableAddPeriod(ITable table)
         {
-            return new SqlPreCommandSimple($"ALTER TABLE {table.Name} ADD {Period(table.SystemVersioned)}");
+            return new SqlPreCommandSimple($"ALTER TABLE {table.Name} ADD {Period(table.SystemVersioned!)}");
         }
 
         static string Period(SystemVersionedInfo sv) {
@@ -98,7 +98,7 @@ public static SqlPreCommand AlterTableDropPeriod(ITable table)
 
         public static SqlPreCommand AlterTableEnableSystemVersioning(ITable table)
         {
-            return new SqlPreCommandSimple($"ALTER TABLE {table.Name} SET (SYSTEM_VERSIONING = ON (HISTORY_TABLE = {table.SystemVersioned.TableName}))");
+            return new SqlPreCommandSimple($"ALTER TABLE {table.Name} SET (SYSTEM_VERSIONING = ON (HISTORY_TABLE = {table.SystemVersioned!.TableName}))");
         }
 
         public static SqlPreCommand AlterTableDisableSystemVersioning(ObjectName tableName)
@@ -401,7 +401,7 @@ public static SqlPreCommand CreateIndexBasic(Index index, bool forHistoryTable)
             var include = index.IncludeColumns.HasItems() ? $" INCLUDE ({index.IncludeColumns.ToString(c => c.Name.SqlEscape(), ", ")})" : null;
             var where = index.Where.HasText() ? $" WHERE {index.Where}" : "";
 
-            var tableName = forHistoryTable ? index.Table.SystemVersioned.TableName : index.Table.Name;
+            var tableName = forHistoryTable ? index.Table.SystemVersioned!.TableName : index.Table.Name;
 
             return new SqlPreCommandSimple($"CREATE {indexType} {index.IndexName} ON {tableName}({columns}){include}{where}");
         }
diff --git a/Signum.Engine/Engine/SqlUtils.cs b/Signum.Engine/Engine/SqlUtils.cs
index e36fc5e2bb..337e8d1781 100644
--- a/Signum.Engine/Engine/SqlUtils.cs
+++ b/Signum.Engine/Engine/SqlUtils.cs
@@ -218,7 +218,7 @@ public static string SqlEscape(this string ident)
             return ident;
         }
 
-        public static SqlPreCommand RemoveDuplicatedIndices()
+        public static SqlPreCommand? RemoveDuplicatedIndices()
         {
             var plainData = (from s in Database.View<SysSchemas>()
                              from t in s.Tables()
@@ -238,7 +238,7 @@ from c in t.Columns()
                              }).ToList();
 
             var tables = plainData.AgGroupToDictionary(a => a.table,
-                gr => gr.AgGroupToDictionary(a => new { a.index, a.is_unique },
+                gr => gr.AgGroupToDictionary(a => new { a.index, a.is_unique }, 
                     gr2 => gr2.OrderBy(a => a.index_column_id)
                         .Select(a => a.column + (a.is_included_column ? "(K)" : "(I)") + (a.is_descending_key ? "(D)" : "(A)"))
                         .ToString("|")));
@@ -248,10 +248,10 @@ from c in t.Columns()
                 .Where(gr => gr.Count() > 1)
                 .Select(gr =>
                 {
-                    var best = gr.OrderByDescending(a => a.is_unique).ThenByDescending(a => a.index.StartsWith("IX")).ThenByDescending(a => a.index).First();
+                    var best = gr.OrderByDescending(a => a.is_unique).ThenByDescending(a => a.index!/*CSBUG*/.StartsWith("IX")).ThenByDescending(a => a.index).First();
 
                     return gr.Where(g => g != best)
-                        .Select(g => SqlBuilder.DropIndex(t.Key, g.index))
+                        .Select(g => SqlBuilder.DropIndex(t.Key!, g.index!))
                         .PreAnd(new SqlPreCommandSimple("-- DUPLICATIONS OF {0}".FormatWith(best.index))).Combine(Spacing.Simple);
                 })
             ).Combine(Spacing.Double);
diff --git a/Signum.Engine/Linq/DbExpressions.Signum.cs b/Signum.Engine/Linq/DbExpressions.Signum.cs
index 74ba5e50f7..ff5155f762 100644
--- a/Signum.Engine/Linq/DbExpressions.Signum.cs
+++ b/Signum.Engine/Linq/DbExpressions.Signum.cs
@@ -454,10 +454,10 @@ protected override Expression Accept(DbExpressionVisitor visitor)
     internal class AdditionalFieldExpression : DbExpression
     {
         public readonly PrimaryKeyExpression BackID; // not readonly
-        public readonly NewExpression ExternalPeriod;
+        public readonly NewExpression? ExternalPeriod;
         public readonly PropertyRoute Route;
 
-        public AdditionalFieldExpression(Type type, PrimaryKeyExpression backID, NewExpression externalPeriod, PropertyRoute route)
+        public AdditionalFieldExpression(Type type, PrimaryKeyExpression backID, NewExpression? externalPeriod, PropertyRoute route)
             : base(DbExpressionType.AdditionalField, type)
         {
             this.BackID = backID;
diff --git a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
index 062692a671..e168f98f94 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
@@ -41,7 +41,7 @@ internal class DbExpressionNominator : DbExpressionVisitor
         T Add<T>(T expression) where T : Expression?
         {
             if (expression == null)
-                return null;
+                return null!;
 
             this.candidates.Add(expression);
             return expression;
diff --git a/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs b/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
index e9aee96131..e1eb73d666 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
@@ -248,7 +248,7 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
                 {
                     var source = Visit(m.GetArgument("source"));
 
-                    Type elemType = source.Type.ElementType();
+                    Type elemType = source.Type.ElementType()!;
 
                     ParameterExpression pe = Expression.Parameter(elemType);
 
@@ -261,7 +261,7 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
                 {
                     var source = Visit(m.GetArgument("source"));
 
-                    Type elemType = source.Type.ElementType();
+                    Type elemType = source.Type.ElementType()!;
 
                     ParameterExpression pe = Expression.Parameter(elemType);
 
@@ -279,7 +279,7 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
                 if (mi.Name.Contains("Last"))
                 {
                     var source = Visit(m.GetArgument("source"));
-                    var predicate = (LambdaExpression)Visit(m.TryGetArgument("predicate").StripQuotes());
+                    var predicate = (LambdaExpression)Visit(m.TryGetArgument("predicate")?.StripQuotes());
 
                     Expression reverse = Expression.Call((query ? miReverseQ : miReverseE).MakeGenericMethod(paramTypes[0]), source);
 
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs
index 5d61ea352d..dce2404f94 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs
@@ -39,8 +39,8 @@ protected override Expression VisitConstant(ConstantExpression c)
 
                             if (rawFilter != null)
                             {
-                                Expression clean = ExpressionCleaner.Clean(rawFilter);
-                                var cleanFilter = (LambdaExpression)OverloadingSimplifier.Simplify(clean);
+                                Expression clean = ExpressionCleaner.Clean(rawFilter)!;
+                                var cleanFilter = (LambdaExpression)OverloadingSimplifier.Simplify(clean)!;
 
                                 return Expression.Call(miWhere.MakeGenericMethod(queryType), query.Expression, cleanFilter);
                             }
@@ -56,8 +56,8 @@ protected override Expression VisitConstant(ConstantExpression c)
                                 var param = Expression.Parameter(queryType, "mle");
                                 var lambda = Expression.Lambda(Expression.Invoke(rawFilter, Expression.Property(param, "Parent")), param);
 
-                                Expression clean = ExpressionCleaner.Clean(lambda);
-                                var cleanFilter = (LambdaExpression)OverloadingSimplifier.Simplify(clean);
+                                Expression clean = ExpressionCleaner.Clean(lambda)!;
+                                var cleanFilter = (LambdaExpression)OverloadingSimplifier.Simplify(clean)!;
 
                                 return Expression.Call(miWhere.MakeGenericMethod(queryType), query.Expression, cleanFilter);
                             }
@@ -71,7 +71,7 @@ protected override Expression VisitConstant(ConstantExpression c)
                     /// <summary>
                     /// Replaces every expression like ConstantExpression{ Type = IQueryable, Value = complexExpr } by complexExpr
                     /// </summary>
-                    return DbQueryProvider.Clean(query.Expression, filter, null);
+                    return DbQueryProvider.Clean(query.Expression, filter, null)!;
                 }
             }
 
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs
index c6c0c5aafb..51a76f2db7 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs
@@ -316,7 +316,7 @@ protected internal override Expression VisitIn(InExpression inExpression)
             if (inExpression.Select == null)
             {
                 bool any = false;
-                foreach (var obj in inExpression.Values)
+                foreach (var obj in inExpression.Values!)
                 {
                     VisitConstant(Expression.Constant(obj));
                     sb.Append(",");
@@ -572,7 +572,7 @@ protected internal override Expression VisitSqlTableValuedFunction(SqlTableValue
 
         private void AppendColumn(ColumnDeclaration column)
         {
-            ColumnExpression c = column.Expression as ColumnExpression;
+            ColumnExpression? c = column.Expression as ColumnExpression;
 
             if (column.Name.HasText() && (c == null || c.Name != column.Name))
             {
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryRebinder.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryRebinder.cs
index 398d6675a0..15909da986 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryRebinder.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryRebinder.cs
@@ -11,7 +11,7 @@ namespace Signum.Engine.Linq
 {
     internal class QueryRebinder : DbExpressionVisitor
     {
-        ImmutableStack<Dictionary<ColumnExpression, ColumnExpression>> scopes = ImmutableStack<Dictionary<ColumnExpression, ColumnExpression>>.Empty;
+        ImmutableStack<Dictionary<ColumnExpression, ColumnExpression?>> scopes = ImmutableStack<Dictionary<ColumnExpression, ColumnExpression?>>.Empty;
 
         public Dictionary<ColumnExpression, ColumnExpression?> CurrentScope { get { return scopes.Peek(); } }
 
@@ -185,7 +185,7 @@ protected internal override Expression VisitInsertSelect(InsertSelectExpression
 
         protected internal override Expression VisitSelect(SelectExpression select)
         {
-            Dictionary<ColumnExpression, ColumnExpression?> askedColumns = CurrentScope.Keys.Where(k => select.KnownAliases.Contains(k.Alias)).ToDictionary(k => k, k => (ColumnExpression)null);
+            Dictionary<ColumnExpression, ColumnExpression?> askedColumns = CurrentScope.Keys.Where(k => select.KnownAliases.Contains(k.Alias)).ToDictionary(k => k, k => (ColumnExpression?)null);
             Dictionary<ColumnExpression, ColumnExpression?> externalAnswers = CurrentScope.Where(kvp => !select.KnownAliases.Contains(kvp.Key.Alias) && kvp.Value != null).ToDictionary();
 
             var disposable = NewScope();//SCOPE START
@@ -261,11 +261,9 @@ private ReadOnlyCollection<ColumnDeclaration> AnswerAndExpand(ReadOnlyCollection
                     ColumnExpression? colExp = CurrentScope[col];
                     //if (expr is ColumnExpression colExp)
                     //{
-                    ColumnDeclaration cd = cg.Columns.FirstOrDefault(c => c.Expression.Equals(colExp));
+                    ColumnDeclaration? cd = cg.Columns.FirstOrDefault(c => c!.Expression.Equals(colExp));
                     if (cd == null)
-                    {
-                        cd = cg.MapColumn(colExp);
-                    }
+                        cd = cg.MapColumn(colExp!);
 
                     askedColumns[col] = new ColumnExpression(col.Type, currentAlias, cd.Name);
                     //}
@@ -278,20 +276,20 @@ private ReadOnlyCollection<ColumnDeclaration> AnswerAndExpand(ReadOnlyCollection
 
 
             if (columns.Count != cg.Columns.Count())
-                return cg.Columns.ToReadOnly();
+                return cg.Columns.NotNull().ToReadOnly();
 
             return columns;
         }
 
         public IDisposable NewScope()
         {
-            scopes = scopes.Push(new Dictionary<ColumnExpression, ColumnExpression>());
+            scopes = scopes.Push(new Dictionary<ColumnExpression, ColumnExpression?>());
             return new Disposable(() => scopes = scopes.Pop());
         }
 
         protected internal override Expression VisitColumn(ColumnExpression column)
         {
-            if (CurrentScope.TryGetValue(column, out ColumnExpression result))
+            if (CurrentScope.TryGetValue(column, out ColumnExpression? result))
                 return result ?? column;
             else
             {
@@ -302,7 +300,7 @@ protected internal override Expression VisitColumn(ColumnExpression column)
 
         protected internal override Expression VisitScalar(ScalarExpression scalar)
         {
-            var column = scalar.Select.Columns.SingleEx();
+            var column = scalar.Select!.Columns.SingleEx();
 
             VisitColumn(new ColumnExpression(scalar.Type, scalar.Select.Alias, column.Name ?? "-"));
 
diff --git a/Signum.Engine/Linq/ExpressionVisitor/RedundantSubqueryRemover.cs b/Signum.Engine/Linq/ExpressionVisitor/RedundantSubqueryRemover.cs
index 083f577f4d..53173dbd49 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/RedundantSubqueryRemover.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/RedundantSubqueryRemover.cs
@@ -1,7 +1,8 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq.Expressions;
 using System.Collections.ObjectModel;
 using Signum.Utilities.ExpressionTrees;
+using Signum.Utilities;
 
 namespace Signum.Engine.Linq
 {
@@ -23,7 +24,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
             select = (SelectExpression)base.VisitSelect(select);
 
             // first remove all purely redundant subqueries
-            List<SelectExpression> redundant = RedundantSubqueryGatherer.Gather(select.From);
+            List<SelectExpression>? redundant = RedundantSubqueryGatherer.Gather(select.From!);
             if (redundant != null)
             {
                 select = (SelectExpression)SubqueryRemover.Remove(select, redundant);
@@ -37,7 +38,7 @@ protected internal override Expression VisitProjection(ProjectionExpression proj
             proj = (ProjectionExpression)base.VisitProjection(proj);
             if (proj.Select.From is SelectExpression)
             {
-                List<SelectExpression> redundant = RedundantSubqueryGatherer.Gather(proj.Select);
+                List<SelectExpression>? redundant = RedundantSubqueryGatherer.Gather(proj.Select);
                 if (redundant != null)
                 {
                     proj = (ProjectionExpression)SubqueryRemover.Remove(proj, redundant);
@@ -50,7 +51,7 @@ internal static bool IsSimpleProjection(SelectExpression select)
         {
             foreach (ColumnDeclaration decl in select.Columns)
             {
-                ColumnExpression col = decl.Expression as ColumnExpression;
+                ColumnExpression? col = decl.Expression as ColumnExpression;
                 if (col == null || decl.Name != col.Name)
                 {
                     return false;
@@ -62,7 +63,7 @@ internal static bool IsSimpleProjection(SelectExpression select)
         internal static bool IsNameMapProjection(SelectExpression select)
         {
             if (select.From is TableExpression) return false;
-            SelectExpression fromSelect = select.From as SelectExpression;
+            SelectExpression? fromSelect = select.From as SelectExpression;
             if (fromSelect == null || select.Columns.Count != fromSelect.Columns.Count)
                 return false;
             ReadOnlyCollection<ColumnDeclaration> fromColumns = fromSelect.Columns;
@@ -70,7 +71,7 @@ internal static bool IsNameMapProjection(SelectExpression select)
             // in from.
             for (int i = 0, n = select.Columns.Count; i < n; i++)
             {
-                ColumnExpression col = select.Columns[i].Expression as ColumnExpression;
+                ColumnExpression? col = select.Columns[i].Expression as ColumnExpression;
                 if (col == null || !(col.Name == fromColumns[i].Name))
                     return false;
             }
@@ -84,13 +85,9 @@ internal static bool IsInitialProjection(SelectExpression select)
 
         class RedundantSubqueryGatherer : DbExpressionVisitor
         {
-            List<SelectExpression> redundant;
-
-            private RedundantSubqueryGatherer()
-            {
-            }
-
-            internal static List<SelectExpression> Gather(Expression source)
+            List<SelectExpression>? redundant;
+            
+            internal static List<SelectExpression>? Gather(Expression source)
             {
                 RedundantSubqueryGatherer gatherer = new RedundantSubqueryGatherer();
                 gatherer.Visit(source);
@@ -163,13 +160,13 @@ protected internal override Expression VisitSelect(SelectExpression select)
                 // logic except for the existence of a where clause
                 while (CanMergeWithFrom(select, wasTopLevel))
                 {
-                    SelectExpression fromSelect = GetLeftMostSelect(select.From);
+                    SelectExpression? fromSelect = GetLeftMostSelect(select.From!);
 
                     // remove the redundant subquery
                     select = (SelectExpression)SubqueryRemover.Remove(select, new[] { fromSelect });
 
                     // merge where expressions
-                    Expression where = select.Where;
+                    Expression? where = select.Where;
                     if (fromSelect.Where != null)
                     {
                         if (where != null)
@@ -184,7 +181,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
                     var orderBy = select.OrderBy.Count > 0 ? select.OrderBy : fromSelect.OrderBy;
                     var groupBy = select.GroupBy.Count > 0 ? select.GroupBy : fromSelect.GroupBy;
                     //Expression skip = select.Skip != null ? select.Skip : fromSelect.Skip;
-                    Expression top = select.Top != null ? select.Top : fromSelect.Top;
+                    Expression? top = select.Top ?? fromSelect.Top;
                     bool isDistinct = select.IsDistinct | fromSelect.IsDistinct;
 
                     if (where != select.Where
@@ -215,11 +212,13 @@ static bool IsColumnProjection(SelectExpression select)
 
             static bool CanMergeWithFrom(SelectExpression select, bool isTopLevel)
             {
-                SelectExpression fromSelect = GetLeftMostSelect(select.From);
+                SelectExpression? fromSelect = GetLeftMostSelect(select.From!);
                 if (fromSelect == null)
                     return false;
+
                 if (!IsColumnProjection(fromSelect))
                     return false;
+
                 bool selHasOrderBy = select.OrderBy.Count > 0;
                 bool selHasGroupBy = select.GroupBy.Count > 0;
 
@@ -243,7 +242,7 @@ static bool CanMergeWithFrom(SelectExpression select, bool isTopLevel)
                     return false;
 
                 // cannot move forward a take if outer has take or skip or distinct
-                if (fromSelect.Top != null && (select.Top != null || /*select.Skip != null ||*/ select.IsDistinct || selHasGroupBy || HasApplyJoin(select.From) || select.Where != null))
+                if (fromSelect.Top != null && (select.Top != null || /*select.Skip != null ||*/ select.IsDistinct || selHasGroupBy || HasApplyJoin(select.From!) || select.Where != null))
                     return false;
                 // cannot move forward a skip if outer has skip or distinct
                 //if (fromSelect.Skip != null && (select.Skip != null || select.Distinct || selHasAggregates || selHasGroupBy))
@@ -261,7 +260,8 @@ static SelectExpression GetLeftMostSelect(Expression source)
 
                 if (source is JoinExpression join)
                     return GetLeftMostSelect(join.Left);
-                return null;
+
+                throw new UnexpectedValueException(source);
             }
 
             static bool HasApplyJoin(SourceExpression source)
diff --git a/Signum.Engine/Linq/ExpressionVisitor/SmartEqualizer.cs b/Signum.Engine/Linq/ExpressionVisitor/SmartEqualizer.cs
index 70e2155067..3804d4d2df 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/SmartEqualizer.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/SmartEqualizer.cs
@@ -56,11 +56,11 @@ public static Expression PolymorphicEqual(Expression exp1, Expression exp2)
                 exp1 = ConstanToNewExpression(exp1) ?? exp1;
                 exp2 = ConstanToNewExpression(exp2) ?? exp2;
 
-                return (exp1 as NewExpression).Arguments.ZipStrict(
-                       (exp2 as NewExpression).Arguments, (o, i) => SmartEqualizer.PolymorphicEqual(o, i)).AggregateAnd();
+                return ((NewExpression)exp1).Arguments.ZipStrict(
+                       ((NewExpression)exp2).Arguments, (o, i) => SmartEqualizer.PolymorphicEqual(o, i)).AggregateAnd();
             }
 
-            Expression result;
+            Expression? result;
             result = PrimaryKeyEquals(exp1, exp2);
             if (result != null)
                 return result;
@@ -101,7 +101,7 @@ public static Expression PolymorphicEqual(Expression exp1, Expression exp2)
             return EqualNullable(exp1, exp2);
         }
 
-        private static Expression EnumEquals(Expression exp1, Expression exp2)
+        private static Expression? EnumEquals(Expression exp1, Expression exp2)
         {
             var exp1Clean = RemoveConvertChain(exp1);
             var exp2Clean = RemoveConvertChain(exp2);
@@ -124,7 +124,7 @@ private static Expression EnumEquals(Expression exp1, Expression exp2)
             return null;
         }
         
-        private static Expression ConstantToDayOfWeek(Expression exp)
+        private static Expression? ConstantToDayOfWeek(Expression exp)
         {
             if (exp is ConstantExpression c)
             {
@@ -150,10 +150,8 @@ private static Expression RemoveConvertChain(Expression exp)
 
             }
         }
-
-
-
-        private static Expression ConstanToNewExpression(Expression exp)
+        
+        private static Expression? ConstanToNewExpression(Expression exp)
         {
             var ce = exp as ConstantExpression;
 
@@ -172,7 +170,7 @@ private static Expression ConstanToNewExpression(Expression exp)
             return Expression.New(ci, ci.GetParameters().Select(p => Expression.Constant(values.GetOrThrow(p.Name), p.ParameterType)));
         }
 
-        public static Expression PrimaryKeyEquals(Expression exp1, Expression exp2)
+        public static Expression? PrimaryKeyEquals(Expression exp1, Expression exp2)
         {
             if (exp1.Type.UnNullify() == typeof(PrimaryKey) || exp2.Type.UnNullify() == typeof(PrimaryKey))
             {
@@ -185,7 +183,7 @@ public static Expression PrimaryKeyEquals(Expression exp1, Expression exp2)
             return null;
         }
 
-        public static Expression ObjectEquals(Expression expr1, Expression expr2)
+        public static Expression? ObjectEquals(Expression expr1, Expression expr2)
         {
             if (expr1.Type == typeof(object) && expr2.Type == typeof(object))
             {
@@ -195,8 +193,8 @@ public static Expression ObjectEquals(Expression expr1, Expression expr2)
                 if (left == null && right == null)
                     return null;
 
-                left = left ?? ChangeConstant(expr1, right.Type);
-                right = right ?? ChangeConstant(expr2, left.Type);
+                left = left ?? ChangeConstant(expr1, right!.Type);
+                right = right ?? ChangeConstant(expr2, left!.Type);
 
                 if (left == null || right == null)
                     return null;
@@ -207,7 +205,7 @@ public static Expression ObjectEquals(Expression expr1, Expression expr2)
             return null;
         }
 
-        private static Expression ChangeConstant(Expression exp, Type type)
+        private static Expression? ChangeConstant(Expression exp, Type type)
         {
             if (exp is ConstantExpression ce)
             {
@@ -230,7 +228,7 @@ private static Expression ChangeConstant(Expression exp, Type type)
             return null;
         }
 
-        private static Expression UncastObject(Expression expr)
+        private static Expression? UncastObject(Expression expr)
         {
             if (expr.NodeType == ExpressionType.Convert)
                 return ((UnaryExpression)expr).Operand;
@@ -281,7 +279,7 @@ static bool LessThanOrEqual(Guid a, Guid b)
                 return a.CompareTo(b) <= 0;
             }
 
-            public static MethodInfo GetMethod(ExpressionType type)
+            public static MethodInfo? GetMethod(ExpressionType type)
             {
                 switch (type)
                 {
@@ -318,7 +316,7 @@ public static Expression UnwrapPrimaryKey(Expression unary)
             return unary;
         }
 
-        private static Expression ConditionalEquals(Expression exp1, Expression exp2)
+        private static Expression? ConditionalEquals(Expression exp1, Expression exp2)
         {
             if (Schema.Current.Settings.IsDbType(exp1.Type)||
                 Schema.Current.Settings.IsDbType(exp2.Type))
@@ -341,7 +339,7 @@ private static Expression DispachConditional(ConditionalExpression ce, Expressio
             return SmartOr(SmartAnd(ce.Test, ifTrue), SmartAnd(SmartNot(ce.Test), ifFalse));
         }
 
-        private static Expression CoalesceEquals(Expression exp1, Expression exp2)
+        private static Expression? CoalesceEquals(Expression exp1, Expression exp2)
         {
             if (Schema.Current.Settings.IsDbType(exp1.Type)||
                 Schema.Current.Settings.IsDbType(exp2.Type))
@@ -405,7 +403,7 @@ private static Expression SmartOr(Expression e1, Expression e2)
             return Expression.Or(e1, e2);
         }
 
-        private static Expression TypeEquals(Expression exp1, Expression exp2)
+        private static Expression? TypeEquals(Expression exp1, Expression exp2)
         {
             if (exp1.Type != typeof(Type) || exp2.Type != typeof(Type))
                 return null;
@@ -455,7 +453,7 @@ private static Expression TypeConstantEntityEquals(ConstantExpression ce, TypeEn
             return False;
         }
 
-        private static Expression TypeConstantIbEquals(ConstantExpression ce, TypeImplementedByExpression typeIb)
+        private static Expression? TypeConstantIbEquals(ConstantExpression ce, TypeImplementedByExpression typeIb)
         {
             if (ce.IsNull())
             {
@@ -466,7 +464,7 @@ private static Expression TypeConstantIbEquals(ConstantExpression ce, TypeImplem
 
             var externalId = typeIb.TypeImplementations.TryGetC(type);
 
-            return NotEqualToNull(externalId);
+            return externalId == null ? False : NotEqualToNull(externalId);
         }
 
         private static Expression TypeConstantIbaEquals(ConstantExpression ce, TypeImplementedByAllExpression typeIba)
@@ -575,7 +573,7 @@ internal static Expression TypeIn(Expression typeExpr, IEnumerable<Type> collect
 
         public static Expression In(Expression element, object[] values)
         {
-            var nominate = DbExpressionNominator.FullNominate(element);
+            var nominate = DbExpressionNominator.FullNominate(element)!;
 
             if (nominate is ToDayOfWeekExpression dowe)
             {
@@ -599,7 +597,7 @@ public static Expression InPrimaryKey(Expression element, PrimaryKey[] values)
             if (cleanElement == NewId)
                 return False;
 
-            return InExpression.FromValues(DbExpressionNominator.FullNominate(cleanElement), cleanValues);
+            return InExpression.FromValues(DbExpressionNominator.FullNominate(cleanElement)!, cleanValues);
         }
 
         private static Expression DispachConditionalTypesIn(ConditionalExpression ce, IEnumerable<Type> collection)
@@ -650,7 +648,7 @@ static Expression EntityIn(Expression newItem, Dictionary<Type, PrimaryKey[]> en
 
 
 
-        public static Expression LiteEquals(Expression e1, Expression e2)
+        public static Expression? LiteEquals(Expression e1, Expression e2)
         {
             if ( e1.Type.IsLite() || e2.Type.IsLite())
             {
@@ -663,7 +661,7 @@ public static Expression LiteEquals(Expression e1, Expression e2)
             return null;
         }
 
-        public static Expression MListElementEquals(Expression e1, Expression e2)
+        public static Expression? MListElementEquals(Expression e1, Expression e2)
         {
             if (e1 is MListElementExpression || e2 is MListElementExpression)
             {
@@ -695,7 +693,7 @@ private static Expression GetEntity(Expression liteExp)
             return liteReference.Reference;
         }
 
-        public static Expression EntityEquals(Expression e1, Expression e2)
+        public static Expression? EntityEquals(Expression e1, Expression e2)
         {
             e1 = ConstantToEntity(e1) ?? e1;
             e2 = ConstantToEntity(e2) ?? e2;
@@ -804,9 +802,9 @@ static Expression NotEqualToNull(PrimaryKeyExpression exp)
             return NotEqualNullable(exp.Value, new SqlConstantExpression(null, exp.ValueType));
         }
 
-        public static Expression ConstantToEntity(Expression expression)
+        public static Expression? ConstantToEntity(Expression expression)
         {
-            ConstantExpression c = expression as ConstantExpression;
+            ConstantExpression? c = expression as ConstantExpression;
             if (c == null)
                 return null;
 
@@ -828,9 +826,9 @@ public static Expression ConstantToEntity(Expression expression)
 
 
 
-        public static Expression ConstantToLite(Expression expression)
+        public static Expression? ConstantToLite(Expression expression)
         {
-            ConstantExpression c = expression as ConstantExpression;
+            ConstantExpression? c = expression as ConstantExpression;
             if (c == null)
                 return null;
 
diff --git a/Signum.Engine/Linq/ExpressionVisitor/UnusedColumnRemover.cs b/Signum.Engine/Linq/ExpressionVisitor/UnusedColumnRemover.cs
index da35a0d10e..570aa6d42c 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/UnusedColumnRemover.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/UnusedColumnRemover.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq;
@@ -48,7 +48,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
             Expression where = this.Visit(select.Where);
             ReadOnlyCollection<Expression> groupBy = select.GroupBy.Select(e => IsConstant(e) ? null : Visit(e)).NotNull().ToReadOnly();
 
-            SourceExpression from = this.VisitSource(select.From);
+            SourceExpression? from = this.VisitSource(select.From!);
 
             if (columns != select.Columns || orderbys != select.OrderBy || where != select.Where || from != select.From || groupBy != select.GroupBy)
                 return new SelectExpression(select.Alias, select.IsDistinct, select.Top, columns, from, where, orderbys, groupBy, select.SelectOptions);
@@ -74,7 +74,7 @@ protected internal override Expression VisitScalar(ScalarExpression scalar)
 
         private void AddSingleColumn(SubqueryExpression subQuery)
         {
-            if (subQuery.Select.Columns.Count != 1)
+            if (subQuery.Select!.Columns.Count != 1)
                 throw new InvalidOperationException("Subquery has {0} columns: {1}".FormatWith(subQuery.Select.Columns.Count, subQuery.ToString()));
             allColumnsUsed.GetOrCreate(subQuery.Select.Alias).Add(subQuery.Select.Columns[0].Name);
         }
@@ -105,7 +105,7 @@ protected internal override Expression VisitJoin(JoinExpression join)
         {
             if (join.JoinType == JoinType.SingleRowLeftOuterJoin)
             {
-                var source = join.Right as SourceWithAliasExpression;
+                var source = (SourceWithAliasExpression)join.Right;
 
                 var hs = allColumnsUsed.TryGetC(source.Alias);
 
@@ -165,7 +165,7 @@ protected internal override Expression VisitInsertSelect(InsertSelectExpression
 
         protected internal override Expression VisitRowNumber(RowNumberExpression rowNumber)
         {
-            var orderBys = Visit(rowNumber.OrderBy, o => IsConstant(o.Expression) ? null : Visit(o.Expression).Let(e => e == o.Expression ? o : new OrderExpression(o.OrderType, e))); ;
+            var orderBys = Visit(rowNumber.OrderBy, o => IsConstant(o.Expression) ? null! : Visit(o.Expression).Let(e => e == o.Expression ? o : new OrderExpression(o.OrderType, e))); ;
             if (orderBys != rowNumber.OrderBy)
                 return new RowNumberExpression(orderBys);
             return rowNumber;
@@ -183,4 +183,4 @@ protected internal override Expression VisitChildProjection(ChildProjectionExpre
             return child;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Engine/Linq/Meta/MetaExpression.cs b/Signum.Engine/Linq/Meta/MetaExpression.cs
index 4f34777f5d..1d0c4484d4 100644
--- a/Signum.Engine/Linq/Meta/MetaExpression.cs
+++ b/Signum.Engine/Linq/Meta/MetaExpression.cs
@@ -67,9 +67,9 @@ public bool IsEntity
             get { return typeof(ModifiableEntity).IsAssignableFrom(Type); }
         }
 
-        public readonly Meta Meta;
+        public Meta Meta { get; private set; }
 
-        public MetaExpression(Type type, Meta? meta):
+        public MetaExpression(Type type, Meta meta):
             base(MetaExpressionType.MetaExpression, type)
         {
             this.Meta = meta;
diff --git a/Signum.Engine/Linq/Meta/MetadataVisitor.cs b/Signum.Engine/Linq/Meta/MetadataVisitor.cs
index 392ab931ee..ba3d5be742 100644
--- a/Signum.Engine/Linq/Meta/MetadataVisitor.cs
+++ b/Signum.Engine/Linq/Meta/MetadataVisitor.cs
@@ -24,7 +24,7 @@ internal class MetadataVisitor : ExpressionVisitor
 
         private MetadataVisitor() { }
 
-        static internal Dictionary<string, Meta?>? GatherMetadata(Expression expression)
+        static internal Dictionary<string, Meta?> GatherMetadata(Expression expression)
         {
             if (expression == null)
                 throw new ArgumentException("expression");
@@ -41,7 +41,7 @@ private MetadataVisitor() { }
             if (proj.NodeType != ExpressionType.New &&  //anonymous types
                 proj.NodeType != ExpressionType.MemberInit && // not-anonymous type
                 !(proj is MetaExpression && ((MetaExpression)proj).IsEntity)) // raw-entity!
-                return null;
+                throw new UnexpectedValueException(proj);
 
             PropertyInfo[] props = proj.Type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
 
@@ -457,13 +457,13 @@ static Expression BindMember(Expression source, MemberInfo member, Type memberTy
                 var pi = member as PropertyInfo ?? Reflector.TryFindPropertyInfo((FieldInfo)member);
 
                 if (pi == null)
-                    return new MetaExpression(memberType, null);
+                    return new MetaExpression(memberType, new DirtyMeta(null, new Meta[0]));
 
                 MetaExpression meta = (MetaExpression)source;
 
                 if (meta.Meta.Implementations != null)
                 {
-                    var routes = meta.Meta.Implementations.Value.Types.Select(t=> PropertyRoute.Root(t).Add(pi)).ToArray();
+                    var routes = meta.Meta.Implementations.Value.Types.Select(t => PropertyRoute.Root(t).Add(pi)).ToArray();
 
                     return new MetaExpression(memberType, new CleanMeta(GetImplementations(routes, memberType), routes));
                 }
@@ -542,7 +542,7 @@ protected override Expression VisitUnary(UnaryExpression u)
 
             if (u.NodeType == ExpressionType.Convert || u.NodeType == ExpressionType.TypeAs)
             {
-                var imps = exp.Meta.Implementations?.Let(s => CastImplementations(s, u.Type.CleanType()));
+                var imps = exp.Meta?.Implementations?.Let(s => CastImplementations(s, u.Type.CleanType()));
 
                 return new MetaExpression(u.Type, exp.Meta is DirtyMeta ?
                     (Meta)new DirtyMeta(imps, ((DirtyMeta)exp.Meta).CleanMetas.Cast<Meta>().ToArray()) :
diff --git a/Signum.Engine/Linq/ProjectionReader.cs b/Signum.Engine/Linq/ProjectionReader.cs
index 0b6d2d011c..0b8f2e4f0b 100644
--- a/Signum.Engine/Linq/ProjectionReader.cs
+++ b/Signum.Engine/Linq/ProjectionReader.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
@@ -32,14 +32,12 @@ internal class ProjectionRowEnumerator<T> : IProjectionRow, IEnumerator<T>
     {
         public FieldReader Reader { get; private set;}
         public IRetriever Retriever { get; private set; }
-
-        public IProjectionRow Parent { get; private set; }
-
+        
         public CancellationToken Token { get; private set; }
 
         DbDataReader dataReader;
 
-        T current;
+        T current = default(T)!;
         Func<IProjectionRow, T> projector;
         Expression<Func<IProjectionRow, T>> projectorExpression;
 
@@ -63,7 +61,7 @@ public T Current
             get { return this.current; }
         }
 
-        object IEnumerator.Current
+        object? IEnumerator.Current
         {
             get { return this.current; }
         }
@@ -110,7 +108,7 @@ public MList<S> LookupRequest<K, S>(LookupToken token, K key, MList<S> field)
 
     internal class ProjectionRowEnumerable<T> : IEnumerable<T>, IEnumerable
     {
-        ProjectionRowEnumerator<T> enumerator;
+        ProjectionRowEnumerator<T>? enumerator;
 
         internal ProjectionRowEnumerable(ProjectionRowEnumerator<T> enumerator)
         {
@@ -119,8 +117,7 @@ internal ProjectionRowEnumerable(ProjectionRowEnumerator<T> enumerator)
 
         public IEnumerator<T> GetEnumerator()
         {
-            return Interlocked.Exchange(ref enumerator, null)
-                .ThrowIfNull("Cannot enumerate more than once");
+            return Interlocked.Exchange(ref enumerator, null).ThrowIfNull("Cannot enumerate more than once");
         }
 
         IEnumerator IEnumerable.GetEnumerator()
diff --git a/Signum.Engine/Patterns/VirtualMList.cs b/Signum.Engine/Patterns/VirtualMList.cs
index c35f6548f7..e07411f61f 100644
--- a/Signum.Engine/Patterns/VirtualMList.cs
+++ b/Signum.Engine/Patterns/VirtualMList.cs
@@ -132,8 +132,8 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
                 sb.Schema.EntityEvents<T>().RegisterBinding<MList<L>>(mListField,
                      shouldSet: () => !lazyRetrieve.Value && !VirtualMList.ShouldAvoidMListType(typeof(L)),
                      valueExpression: e => Database.Query<L>().Where(line => backReference.Evaluate(line) == e.ToLite()).ExpandLite(line => backReference.Evaluate(line), ExpandLite.ToStringLazy).ToVirtualMListWithOrder(),
-                     valueFunction: (e, retriever) => Schema.Current.CacheController<L>().Enabled ?
-                     Schema.Current.CacheController<L>().RequestByBackReference<T>(retriever, backReference, e.ToLite()).ToVirtualMListWithOrder():
+                     valueFunction: (e, retriever) => Schema.Current.CacheController<L>()!.Enabled ?
+                     Schema.Current.CacheController<L>()!.RequestByBackReference<T>(retriever, backReference, e.ToLite()).ToVirtualMListWithOrder():
                      Database.Query<L>().Where(line => backReference.Evaluate(line) == e.ToLite()).ExpandLite(line => backReference.Evaluate(line), ExpandLite.ToStringLazy).ToVirtualMListWithOrder()
 
                 );
@@ -143,8 +143,8 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
                 sb.Schema.EntityEvents<T>().RegisterBinding(mListField,
                     shouldSet: () => !lazyRetrieve.Value && !VirtualMList.ShouldAvoidMListType(typeof(L)),
                     valueExpression: e => Database.Query<L>().Where(line => backReference.Evaluate(line) == e.ToLite()).ExpandLite(line => backReference.Evaluate(line), ExpandLite.ToStringLazy).ToVirtualMList(),
-                    valueFunction: (e, retriever) => Schema.Current.CacheController<L>().Enabled ?
-                    Schema.Current.CacheController<L>().RequestByBackReference<T>(retriever, backReference, e.ToLite()).ToVirtualMList() :
+                    valueFunction: (e, retriever) => Schema.Current.CacheController<L>()!.Enabled ?
+                    Schema.Current.CacheController<L>()!.RequestByBackReference<T>(retriever, backReference, e.ToLite()).ToVirtualMList() :
                     Database.Query<L>().Where(line => backReference.Evaluate(line) == e.ToLite()).ExpandLite(line => backReference.Evaluate(line), ExpandLite.ToStringLazy).ToVirtualMList()
                 );
             }
diff --git a/Signum.Engine/Schema/Schema.Basics.cs b/Signum.Engine/Schema/Schema.Basics.cs
index f1355d08d9..6926fe18fe 100644
--- a/Signum.Engine/Schema/Schema.Basics.cs
+++ b/Signum.Engine/Schema/Schema.Basics.cs
@@ -147,7 +147,7 @@ public void GenerateColumns()
             inserterDisableIdentity = new ResetLazy<InsertCacheDisableIdentity>(() => InsertCacheDisableIdentity.InitializeInsertDisableIdentity(this));
             inserterIdentity = new ResetLazy<InsertCacheIdentity>(() => InsertCacheIdentity.InitializeInsertIdentity(this));
             updater = new ResetLazy<UpdateCache>(() => UpdateCache.InitializeUpdate(this));
-            saveCollections = new ResetLazy<CollectionsCache>(() => CollectionsCache.InitializeCollections(this));
+            saveCollections = new ResetLazy<CollectionsCache?>(() => CollectionsCache.InitializeCollections(this));
         }
 
         public Field GetField(MemberInfo member)
@@ -325,7 +325,7 @@ public virtual IEnumerable<Index> GenerateIndexes(ITable table)
             return new[] { UniqueIndex };
         }
 
-        public virtual UniqueIndex? GenerateUniqueIndex(ITable table, UniqueIndexAttribute attribute)
+        public virtual UniqueIndex? GenerateUniqueIndex(ITable table, UniqueIndexAttribute? attribute)
         {
             if (attribute == null)
                 return null;
diff --git a/Signum.Engine/Schema/Schema.Delete.cs b/Signum.Engine/Schema/Schema.Delete.cs
index 8858582858..41561cf92e 100644
--- a/Signum.Engine/Schema/Schema.Delete.cs
+++ b/Signum.Engine/Schema/Schema.Delete.cs
@@ -27,7 +27,7 @@ public SqlPreCommand DeleteSqlSync<T>(T entity, Expression<Func<T, bool>>? where
             var main = new SqlPreCommandSimple("DELETE {0} WHERE {1} = {2} --{3}"
                     .FormatWith(Name, this.PrimaryKey.Name.SqlEscape(), variableOrId, comment ?? entity.ToString()));
 
-            return SqlPreCommand.Combine(Spacing.Simple, declaration, pre, collections, main);
+            return SqlPreCommand.Combine(Spacing.Simple, declaration, pre, collections, main)!;
         }
 
         int parameterIndex;
@@ -45,9 +45,9 @@ private SqlPreCommand DeclarePrimaryKeyVariable<T>(T entity, Expression<Func<T,
             return result;
         }
 
-        public event Func<Entity, SqlPreCommand> PreDeleteSqlSync;
+        public event Func<Entity, SqlPreCommand?> PreDeleteSqlSync;
 
-        SqlPreCommand OnPreDeleteSqlSync(Entity entity)
+        SqlPreCommand? OnPreDeleteSqlSync(Entity entity)
         {
             if (PreDeleteSqlSync == null)
                 return null;
diff --git a/Signum.Engine/Schema/Schema.Save.cs b/Signum.Engine/Schema/Schema.Save.cs
index 18ca99ba6b..b2f37c0c97 100644
--- a/Signum.Engine/Schema/Schema.Save.cs
+++ b/Signum.Engine/Schema/Schema.Save.cs
@@ -353,7 +353,7 @@ internal bool SetToStrField(Entity entity)
 
         internal static FieldInfo fiId = ReflectionTools.GetFieldInfo((Entity i) => i.id);
 
-        internal void UpdateMany(List<Entity> list, DirectedGraph<Entity> backEdges)
+        internal void UpdateMany(List<Entity> list, DirectedGraph<Entity>? backEdges)
         {
             using (HeavyProfiler.LogNoStackTrace("UpdateMany", () => this.Type.TypeName()))
             {
@@ -369,8 +369,8 @@ class UpdateCache
             public Func<string, bool, string> SqlUpdatePattern;
             public Func<Entity, long, Forbidden, string, List<DbParameter>> UpdateParameters;
 
-            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>> updateCache =
-                new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>>>();
+            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>> updateCache =
+                new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>>();
 
             public UpdateCache(Table table, Func<string, bool, string> sqlUpdatePattern, Func<Entity, long, Forbidden, string, List<DbParameter>> updateParameters)
             {
@@ -379,12 +379,12 @@ public UpdateCache(Table table, Func<string, bool, string> sqlUpdatePattern, Fun
                 UpdateParameters = updateParameters;
             }
 
-            public Action<List<Entity>, DirectedGraph<Entity>> GetUpdater(int numElements)
+            public Action<List<Entity>, DirectedGraph<Entity>?> GetUpdater(int numElements)
             {
                 return updateCache.GetOrAdd(numElements, num => num == 1 ? GenerateUpdate() : GetUpdateMultiple(num));
             }
 
-            Action<List<Entity>, DirectedGraph<Entity>> GenerateUpdate()
+            Action<List<Entity>, DirectedGraph<Entity>?> GenerateUpdate()
             {
                 string sqlUpdate = SqlUpdatePattern("", false);
 
@@ -427,7 +427,7 @@ Action<List<Entity>, DirectedGraph<Entity>> GenerateUpdate()
                 }
             }
 
-            Action<List<Entity>, DirectedGraph<Entity>> GetUpdateMultiple(int num)
+            Action<List<Entity>, DirectedGraph<Entity>?> GetUpdateMultiple(int num)
             {
                 string sqlMulti = new StringBuilder()
                       .AppendLine("DECLARE @NotFound TABLE (Id " + this.table.PrimaryKey.SqlDbType.ToString().ToUpperInvariant() + ");")
@@ -602,7 +602,7 @@ public CollectionsCache(Func<Entity, string, bool, SqlPreCommand> insertCollecti
             }
         }
 
-        ResetLazy<CollectionsCache> saveCollections;
+        ResetLazy<CollectionsCache?> saveCollections;
 
 
         public SqlPreCommand InsertSqlSync(Entity ident, bool includeCollections = true, string? comment = null, string suffix = "")
diff --git a/Signum.Engine/Schema/Schema.cs b/Signum.Engine/Schema/Schema.cs
index aa05fa5380..e093da820b 100644
--- a/Signum.Engine/Schema/Schema.cs
+++ b/Signum.Engine/Schema/Schema.cs
@@ -697,10 +697,8 @@ public Implementations FindImplementations(PropertyRoute route)
             Expression e = MetadataVisitor.JustVisit(lambda, new MetaExpression(route.Parent!.Type, new CleanMeta(route.Parent!.TryGetImplementations(), new[] { route.Parent! })));
 
             MetaExpression? me = e as MetaExpression;
-            if (me == null)
-                return null;
 
-            return me.Meta.Implementations;
+            return me?.Meta.Implementations;
         }
 
         /// <summary>
diff --git a/Signum.Engine/Schema/SchemaAssets.cs b/Signum.Engine/Schema/SchemaAssets.cs
index 1dfdc69e6f..f408261bf2 100644
--- a/Signum.Engine/Schema/SchemaAssets.cs
+++ b/Signum.Engine/Schema/SchemaAssets.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using Signum.Utilities;
 using Signum.Engine.SchemaInfoTables;
@@ -7,18 +7,18 @@ namespace Signum.Engine.Maps
 {
     public class SchemaAssets
     {
-        internal SqlPreCommand Schema_Generating()
+        internal SqlPreCommand? Schema_Generating()
         {
-            SqlPreCommand views = GenerateViews();
-            SqlPreCommand procedures = GenerateProcedures();
+            SqlPreCommand? views = GenerateViews();
+            SqlPreCommand? procedures = GenerateProcedures();
 
             return SqlPreCommand.Combine(Spacing.Triple, views, procedures);
         }
 
-        internal SqlPreCommand Schema_Synchronizing(Replacements replacements)
+        internal SqlPreCommand? Schema_Synchronizing(Replacements replacements)
         {
-            SqlPreCommand views = SyncViews(replacements);
-            SqlPreCommand procedures = SyncProcedures(replacements);
+            SqlPreCommand? views = SyncViews(replacements);
+            SqlPreCommand? procedures = SyncProcedures(replacements);
 
             return SqlPreCommand.Combine(Spacing.Triple, views, procedures);
         }
@@ -34,6 +34,12 @@ public class View
             public ObjectName Name;
             public string Definition;
 
+            public View(ObjectName name, string definition)
+            {
+                Name = name;
+                Definition = definition;
+            }
+
             public SqlPreCommandSimple CreateView()
             {
                 return new SqlPreCommandSimple("CREATE VIEW {0} ".FormatWith(Name) + Definition) { GoBefore = true, GoAfter = true };
@@ -53,19 +59,15 @@ public View IncludeView(string viewName, string viewDefinition)
         public Dictionary<ObjectName, View> Views = new Dictionary<ObjectName, View>();
         public View IncludeView(ObjectName viewName, string viewDefinition)
         {
-            return Views[viewName] = new View
-            {
-                Name = viewName,
-                Definition = viewDefinition
-            };
+            return Views[viewName] = new View(viewName, viewDefinition);
         }
 
-        SqlPreCommand GenerateViews()
+        SqlPreCommand? GenerateViews()
         {
             return Views.Values.Select(v => v.CreateView()).Combine(Spacing.Double);
         }
 
-        SqlPreCommand SyncViews(Replacements replacements)
+        SqlPreCommand? SyncViews(Replacements replacements)
         {
             var oldView = Schema.Current.DatabaseNames().SelectMany(db =>
             {
@@ -98,12 +100,7 @@ public Procedure IncludeStoreProcedure(string procedureName, string procedureCod
 
         public Procedure IncludeStoreProcedure(ObjectName procedureName, string procedureCodeAndArguments)
         {
-            return StoreProcedures[procedureName] =  new Procedure
-            {
-                ProcedureName = procedureName,
-                ProcedureCodeAndArguments = procedureCodeAndArguments,
-                ProcedureType = "PROCEDURE"
-            };
+            return StoreProcedures[procedureName] = new Procedure("PROCEDURE", procedureName, procedureCodeAndArguments);
         }
 
         public Procedure IncludeUserDefinedFunction(string functionName, string functionCodeAndArguments)
@@ -113,20 +110,15 @@ public Procedure IncludeUserDefinedFunction(string functionName, string function
 
         public Procedure IncludeUserDefinedFunction(ObjectName functionName, string functionCodeAndArguments)
         {
-            return StoreProcedures[functionName] = new Procedure
-            {
-                ProcedureName = functionName,
-                ProcedureCodeAndArguments = functionCodeAndArguments,
-                ProcedureType = "FUNCTION"
-            };
+            return StoreProcedures[functionName] = new Procedure("FUNCTION", functionName, functionCodeAndArguments);
         }
 
-        SqlPreCommand GenerateProcedures()
+        SqlPreCommand? GenerateProcedures()
         {
             return StoreProcedures.Select(p => p.Value.CreateSql()).Combine(Spacing.Double);
         }
 
-        SqlPreCommand SyncProcedures(Replacements replacements)
+        SqlPreCommand? SyncProcedures(Replacements replacements)
         {
             var oldProcedures = Schema.Current.DatabaseNames().SelectMany(db =>
             {
@@ -156,6 +148,13 @@ public class Procedure
             public ObjectName ProcedureName;
             public string ProcedureCodeAndArguments;
 
+            public Procedure(string procedureType, ObjectName procedureName, string procedureCodeAndArguments)
+            {
+                ProcedureType = procedureType;
+                ProcedureName = procedureName;
+                ProcedureCodeAndArguments = procedureCodeAndArguments;
+            }
+
             public SqlPreCommandSimple CreateSql()
             {
                 return new SqlPreCommandSimple("CREATE {0} {1} ".FormatWith(ProcedureType, ProcedureName) + ProcedureCodeAndArguments) { GoBefore = true, GoAfter = true };
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
index d3f6ad1cf6..80a0a30c36 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
@@ -292,7 +292,7 @@ void Complete(Table table)
             }
         }
 
-        public SystemVersionedInfo? ToSystemVersionedInfo(SystemVersionedAttribute att, ObjectName tableName)
+        public SystemVersionedInfo? ToSystemVersionedInfo(SystemVersionedAttribute? att, ObjectName tableName)
         {
             if (att == null)
                 return null;
@@ -437,7 +437,7 @@ protected virtual Field GenerateField(ITable table, PropertyRoute route, NameSeq
 
                 //field name generation
                 NameSequence name;
-                ColumnNameAttribute vc = Settings.FieldAttribute<ColumnNameAttribute>(route);
+                ColumnNameAttribute? vc = Settings.FieldAttribute<ColumnNameAttribute>(route);
                 if (vc != null && vc.Name.HasText())
                     name = NameSequence.Void.Add(vc.Name);
                 else if (route.PropertyRouteType != PropertyRouteType.MListItems)
@@ -801,7 +801,7 @@ private SchemaName GetSchemaName(TableNameAttribute tn)
             return schema;
         }
 
-        public virtual ObjectName GenerateTableNameCollection(Table table, NameSequence name, TableNameAttribute tn)
+        public virtual ObjectName GenerateTableNameCollection(Table table, NameSequence name, TableNameAttribute? tn)
         {
             SchemaName sn = tn != null ? GetSchemaName(tn) : SchemaName.Default;
 
@@ -846,7 +846,7 @@ public virtual string GenerateFieldName(PropertyRoute route, KindOfField kindOfF
             }
         }
 
-        public virtual string GenerateBackReferenceName(Type type, BackReferenceColumnNameAttribute attribute)
+        public virtual string GenerateBackReferenceName(Type type, BackReferenceColumnNameAttribute? attribute)
         {
             return attribute?.Name ?? "ParentID";
         }
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
index f75d1fc17c..4f1349e974 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
@@ -312,7 +312,7 @@ internal SqlDbTypePair GetSqlDbType(SqlDbTypeAttribute? att, Type type)
             return defaultScale.TryGetS(sqlDbType);
         }
 
-        internal string? GetCollate(SqlDbTypeAttribute att)
+        internal string? GetCollate(SqlDbTypeAttribute? att)
         {
             if (att != null && att.Collation != null)
                 return att.Collation;
diff --git a/Signum.Engine/Schema/UniqueIndex.cs b/Signum.Engine/Schema/UniqueIndex.cs
index a877324259..d895e9fae8 100644
--- a/Signum.Engine/Schema/UniqueIndex.cs
+++ b/Signum.Engine/Schema/UniqueIndex.cs
@@ -16,9 +16,9 @@ public class Index
     {
         public ITable Table { get; private set; }
         public IColumn[] Columns { get; private set; }
-        public IColumn[] IncludeColumns { get; set; }
+        public IColumn[]? IncludeColumns { get; set; }
 
-        public string Where { get; set; }
+        public string? Where { get; set; }
 
         public static IColumn[] GetColumnsFromFields(params Field[] fields)
         {
@@ -95,7 +95,7 @@ public override string IndexName
             get { return "UIX_{0}".FormatWith(ColumnSignature()).TryStart(Connector.Current.MaxNameLength); }
         }
 
-        public string ViewName
+        public string? ViewName
         {
             get
             {
@@ -140,7 +140,7 @@ static IColumn[] GetColumns(IFieldFinder finder, LambdaExpression field)
         {
             var body = field.Body;
 
-            Type type = RemoveCasting(ref body);
+            Type? type = RemoveCasting(ref body);
 
             body = IndexWhereExpressionVisitor.RemoveLiteEntity(body);
 
@@ -164,7 +164,7 @@ where type.IsAssignableFrom(ic.Key)
             return Index.GetColumnsFromFields(f);
         }
 
-        static Type RemoveCasting(ref Expression body)
+        static Type? RemoveCasting(ref Expression body)
         {
             if (body.NodeType == ExpressionType.Convert && body.Type == typeof(object))
                 body = ((UnaryExpression)body).Operand;
@@ -187,12 +187,14 @@ public class IndexWhereExpressionVisitor : ExpressionVisitor
 
         IFieldFinder RootFinder;
 
+        public IndexWhereExpressionVisitor(IFieldFinder rootFinder)
+        {
+            RootFinder = rootFinder;
+        }
+
         public static string GetIndexWhere(LambdaExpression lambda, IFieldFinder rootFiender)
         {
-            IndexWhereExpressionVisitor visitor = new IndexWhereExpressionVisitor
-            {
-                RootFinder = rootFiender
-            };
+            IndexWhereExpressionVisitor visitor = new IndexWhereExpressionVisitor(rootFiender);
 
             var newLambda = (LambdaExpression)ExpressionEvaluator.PartialEval(lambda);
 
diff --git a/Signum.Engine/Signum.Engine.csproj b/Signum.Engine/Signum.Engine.csproj
index b309f217c9..961a8f4250 100644
--- a/Signum.Engine/Signum.Engine.csproj
+++ b/Signum.Engine/Signum.Engine.csproj
@@ -4,11 +4,15 @@
     <TargetFramework>netcoreapp2.2</TargetFramework>
     <LangVersion>8.0</LangVersion>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-    <NullableReferenceTypes>true</NullableReferenceTypes>
+    <NullableContextOptions>enable</NullableContextOptions>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
+  
+  <PropertyGroup>
+    <NoWarn>1701;1702;8629</NoWarn>
+  </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Signum.Analyzer" Version="1.0.1" />
     <PackageReference Include="Signum.MSBuildTask" Version="1.0.3" />
diff --git a/Signum.Entities/Basics/OperationLog.cs b/Signum.Entities/Basics/OperationLog.cs
index 61b91df511..76733b745f 100644
--- a/Signum.Entities/Basics/OperationLog.cs
+++ b/Signum.Entities/Basics/OperationLog.cs
@@ -24,7 +24,9 @@ public class OperationLogEntity : Entity
 
         static Expression<Func<OperationLogEntity, double?>> DurationExpression =
             log => (double?)(log.End - log.Start).Value.TotalMilliseconds;
+#pragma warning disable SF0002 // Use ExpressionFieldAttribute in non-trivial method or property CSBUG
         [ExpressionField("DurationExpression"), Unit("ms")]
+#pragma warning restore SF0002 // Use ExpressionFieldAttribute in non-trivial method or property
         public double? Duration
         {
             get { return End == null ? null : DurationExpression.Evaluate(this); }
diff --git a/Signum.Entities/DynamicQuery/QueryUtils.cs b/Signum.Entities/DynamicQuery/QueryUtils.cs
index 90c7d115ba..5bd960d680 100644
--- a/Signum.Entities/DynamicQuery/QueryUtils.cs
+++ b/Signum.Entities/DynamicQuery/QueryUtils.cs
@@ -430,7 +430,7 @@ internal static Expression ExtractEntity(this Expression expression, bool idAndT
                 if (!idAndToStr)
                     return Expression.Property(expression, "Entity");
             }
-            return expression!; /*CSBUG*/
+            return expression;
         }
 
         internal static Expression BuildLiteNulifyUnwrapPrimaryKey(this Expression expression, PropertyRoute[] routes)
diff --git a/Signum.Entities/DynamicQuery/Tokens/NetPropertyToken.cs b/Signum.Entities/DynamicQuery/Tokens/NetPropertyToken.cs
index fcbb872729..d32fc32c73 100644
--- a/Signum.Entities/DynamicQuery/Tokens/NetPropertyToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/NetPropertyToken.cs
@@ -39,7 +39,7 @@ public override Type Type
                 return
                     MemberInfo is PropertyInfo pi ? pi.PropertyType.Nullify() :
                     MemberInfo is MethodInfo mi ? mi.ReturnType.Nullify() :
-                    throw new UnexpectedValueException(MemberInfo! /*CSBUG*/);
+                    throw new UnexpectedValueException(MemberInfo);
             }
         }
 
@@ -62,7 +62,7 @@ protected override Expression BuildExpressionInternal(BuildExpressionContext con
             var prop =
                 MemberInfo is PropertyInfo pi ? (Expression)Expression.Property(result.UnNullify(), pi) :
                 MemberInfo is MethodInfo mi ? (mi.IsStatic ? Expression.Call(null, mi, result.UnNullify()) : Expression.Call(result.UnNullify(), mi)) :
-                throw new UnexpectedValueException(MemberInfo! /*CSBUG*/);
+                throw new UnexpectedValueException(MemberInfo);
 
             return Expression.Call(miInSql.MakeGenericMethod(prop.Type), prop).Nullify();
         }
diff --git a/Signum.Entities/MList.cs b/Signum.Entities/MList.cs
index 69de1a90fe..73edeae855 100644
--- a/Signum.Entities/MList.cs
+++ b/Signum.Entities/MList.cs
@@ -616,7 +616,7 @@ void IList.Remove(object value)
         object? IList.this[int index]
         {
             get { return this[index]; }
-            set { this[index] = (T)value; }
+            set { this[index] = (T)value!; }
         }
 
         void ICollection.CopyTo(Array array, int index)
diff --git a/Signum.Entities/ModifiableEntity.cs b/Signum.Entities/ModifiableEntity.cs
index d56bd7b135..dfa7614a3e 100644
--- a/Signum.Entities/ModifiableEntity.cs
+++ b/Signum.Entities/ModifiableEntity.cs
@@ -124,7 +124,9 @@ protected PropertyInfo GetPropertyInfo(string propertyName)
         }
 
         static Expression<Func<ModifiableEntity, string>> ToStringPropertyExpression = m => m.ToString();
+#pragma warning disable SF0002 // Use ExpressionFieldAttribute in non-trivial method or property CSBUG
         [HiddenProperty, ExpressionField("ToStringPropertyExpression")]
+#pragma warning restore SF0002 // Use ExpressionFieldAttribute in non-trivial method or property
         public string ToStringProperty
         {
             get
diff --git a/Signum.Entities/ObjectDumper.cs b/Signum.Entities/ObjectDumper.cs
index 078a89f4cb..db8276e176 100644
--- a/Signum.Entities/ObjectDumper.cs
+++ b/Signum.Entities/ObjectDumper.cs
@@ -44,8 +44,8 @@ class DumpVisitor
             HashSet<object> objects = new HashSet<Object>(ReferenceEqualityComparer<object>.Default);
             public StringBuilder Sb = new StringBuilder();
             int level = 0;
-            ShowIgnoredFields showIgnoredFields;
-            bool showByteArrays;
+            readonly ShowIgnoredFields showIgnoredFields;
+            readonly bool showByteArrays;
 
             public DumpVisitor(ShowIgnoredFields showIgnoredFields, bool showByteArrays)
             {
@@ -69,7 +69,7 @@ public void DumpObject(object o)
                     return;
                 }
 
-                Type t = o!.GetType(); /*CSBUG*/
+                Type t = o.GetType();
 
                 if (IsDelegate(t))
                 {
diff --git a/Signum.Entities/Reflection/EntityStructuralEqualityComparer.cs b/Signum.Entities/Reflection/EntityStructuralEqualityComparer.cs
index 9d9a5dd53c..3203649ba0 100644
--- a/Signum.Entities/Reflection/EntityStructuralEqualityComparer.cs
+++ b/Signum.Entities/Reflection/EntityStructuralEqualityComparer.cs
@@ -267,7 +267,7 @@ public override int GetHashCode(IList<T> obj)
 
     public abstract class EqualityComparerResolverWithCache : IEqualityComparerResolver
     {
-        Dictionary<(Type, PropertyInfo?), IEqualityComparer> cache = new Dictionary<(Type, PropertyInfo?), IEqualityComparer>();
+        readonly Dictionary<(Type, PropertyInfo?), IEqualityComparer> cache = new Dictionary<(Type, PropertyInfo?), IEqualityComparer>();
         public virtual IEqualityComparer GetEqualityComparer(Type type, PropertyInfo? pi)
         {
             if (cache.TryGetValue((type, pi), out var comparer))
@@ -280,7 +280,7 @@ public virtual IEqualityComparer GetEqualityComparer(Type type, PropertyInfo? pi
                 if (comp is ICompletableComparer cc)
                     cc.Complete(this, pi);
 
-                return comp! /*CSBUG*/;
+                return comp;
             }
         }
 
diff --git a/Signum.Entities/Reflection/GraphExplorer.cs b/Signum.Entities/Reflection/GraphExplorer.cs
index 032867f0db..eda8003de8 100644
--- a/Signum.Entities/Reflection/GraphExplorer.cs
+++ b/Signum.Entities/Reflection/GraphExplorer.cs
@@ -157,7 +157,7 @@ public static DirectedGraph<Modifiable> PreSaving(Func<DirectedGraph<Modifiable>
                 if (m is ModifiableEntity me)
                     me.SetTemporalErrors(null);
 
-                m!.PreSaving(ctx); /*CSBUG*/
+                m.PreSaving(ctx);
             });
         }
 
@@ -194,7 +194,7 @@ public static DirectedGraph<Modifiable> PreSaving(Func<DirectedGraph<Modifiable>
         }
 
 
-        static string[] colors =
+        static readonly string[] colors =
         {
              "aquamarine1",  "aquamarine4", "blue", "blueviolet",
              "brown4", "burlywood", "cadetblue1", "cadetblue",
diff --git a/Signum.Entities/Reflection/Reflector.cs b/Signum.Entities/Reflection/Reflector.cs
index 495d6658ce..4500e1bf8e 100644
--- a/Signum.Entities/Reflection/Reflector.cs
+++ b/Signum.Entities/Reflection/Reflector.cs
@@ -209,7 +209,7 @@ public static MemberInfo[] GetMemberListUntyped(LambdaExpression lambdaToField)
             if (e is UnaryExpression ue && ue.NodeType == ExpressionType.Convert && ue.Type == typeof(object))
                 e = ue.Operand;
 
-            MemberInfo[] result = GetMemberListBase(e! /*CSBUG*/);
+            MemberInfo[] result = GetMemberListBase(e);
 
             return result;
         }
diff --git a/Signum.Entities/Signum.Entities.csproj b/Signum.Entities/Signum.Entities.csproj
index 715a252080..8d977101ff 100644
--- a/Signum.Entities/Signum.Entities.csproj
+++ b/Signum.Entities/Signum.Entities.csproj
@@ -4,11 +4,15 @@
     <TargetFramework>netcoreapp2.2</TargetFramework>
     <LangVersion>8.0</LangVersion>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-    <NullableReferenceTypes>true</NullableReferenceTypes>
+    <NullableContextOptions>enable</NullableContextOptions>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <NoWarn>1701;1702;8629</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="Signum.Analyzer" Version="1.0.1" />
     <PackageReference Include="Signum.MSBuildTask" Version="1.0.3" />
diff --git a/Signum.Utilities/ConsoleSwitch.cs b/Signum.Utilities/ConsoleSwitch.cs
index 6d7d7c58eb..3655611882 100644
--- a/Signum.Utilities/ConsoleSwitch.cs
+++ b/Signum.Utilities/ConsoleSwitch.cs
@@ -9,9 +9,9 @@ public class ConsoleSwitch<K, V> : IEnumerable<KeyValuePair<string, WithDescript
         where K : object
         where V : class
     {
-        Dictionary<string, WithDescription<V>> dictionary = new Dictionary<string, WithDescription<V>>(StringComparer.InvariantCultureIgnoreCase);
-        Dictionary<int, string> separators = new Dictionary<int, string>();
-        string welcomeMessage;
+        readonly Dictionary<string, WithDescription<V>> dictionary = new Dictionary<string, WithDescription<V>>(StringComparer.InvariantCultureIgnoreCase);
+        readonly Dictionary<int, string> separators = new Dictionary<int, string>();
+        readonly string welcomeMessage;
 
         public ConsoleSwitch()
             : this(ConsoleMessage.SelectOneOfTheFollowingOptions.NiceToString())
@@ -176,7 +176,9 @@ IEnumerable<WithDescription<V>> GetValuesRange(string line)
                 if (from.HasValue && to == null)
                     return dictionary.Keys.Skip(from.Value).Select(s => dictionary.GetOrThrow(s));
 
+#pragma warning disable CS8629 // Nullable value type may be null. CSBUG
                 return dictionary.Keys.Skip(from.Value).Take((to.Value + 1) - from.Value).Select(s => dictionary.GetOrThrow(s));
+#pragma warning restore CS8629 // Nullable value type may be null.
             }
             else
             {
diff --git a/Signum.Utilities/DataStructures/ImmutableStack.cs b/Signum.Utilities/DataStructures/ImmutableStack.cs
index 077b696ea7..579561525b 100644
--- a/Signum.Utilities/DataStructures/ImmutableStack.cs
+++ b/Signum.Utilities/DataStructures/ImmutableStack.cs
@@ -5,10 +5,7 @@
 
 namespace Signum.Utilities.DataStructures
 {
-   
-
     public class ImmutableStack<T> : IEnumerable<T> 
-        where T : object /*CSBUG*/
     {
         class ImmutableFullStack : ImmutableStack<T>
         {
diff --git a/Signum.Utilities/DataStructures/IntervalDictionaries/Interval.cs b/Signum.Utilities/DataStructures/IntervalDictionaries/Interval.cs
index a9c13554c5..6b66003dfa 100644
--- a/Signum.Utilities/DataStructures/IntervalDictionaries/Interval.cs
+++ b/Signum.Utilities/DataStructures/IntervalDictionaries/Interval.cs
@@ -277,7 +277,9 @@ public int CompareTo(NullableInterval<T> other)
             if (temp != 0)
                 return temp;
 
+#pragma warning disable CS8629 // Nullable value type may be null. CSBUG
             return min.Value.CompareTo(other.min.Value);
+#pragma warning restore CS8629 // Nullable value type may be null.
         }
 
         public int CompareTo(object obj)
diff --git a/Signum.Utilities/DataStructures/IntervalDictionaries/IntervalDictionary.cs b/Signum.Utilities/DataStructures/IntervalDictionaries/IntervalDictionary.cs
index 4b800f5daf..24506faaec 100644
--- a/Signum.Utilities/DataStructures/IntervalDictionaries/IntervalDictionary.cs
+++ b/Signum.Utilities/DataStructures/IntervalDictionaries/IntervalDictionary.cs
@@ -11,7 +11,7 @@ namespace Signum.Utilities.DataStructures
     public class IntervalDictionary<K,V>: IEnumerable<KeyValuePair<Interval<K>, V>>
         where K: struct, IComparable<K>, IEquatable<K>
     {
-        SortedList<Interval<K>, V> dic = new SortedList<Interval<K>, V>();
+        readonly SortedList<Interval<K>, V> dic = new SortedList<Interval<K>, V>();
 
         public IntervalDictionary()
         {
@@ -147,7 +147,8 @@ public V this[K key]
 
         public V TryGet(K key, V defaultValue)
         {
-            this.TryGetValue(key, out defaultValue);
+            if (this.TryGetValue(key, out var value))
+                return value;
             return defaultValue;
         }
 
@@ -287,7 +288,9 @@ public static class IntervalDictionaryExtensions
         public static IntervalDictionary<K, VR> Mix<K, V1, V2, VR>(this IntervalDictionary<K, V1> me, IntervalDictionary<K, V2> other, Func<Interval<K>, IntervalValue<V1>, IntervalValue<V2>, IntervalValue<VR>> mixer)
             where K : struct, IComparable<K>, IEquatable<K>
         {
+#pragma warning disable CS8629 // Nullable value type may be null. CSBUG
             Interval<K>[] keys = me.Intervals.Concat(other.Intervals).SelectMany(a => a.Elements()).Distinct().OrderBy().BiSelectS((min, max) => new Interval<K>(min.Value, max.Value)).ToArray();
+#pragma warning restore CS8629 // Nullable value type may be null.
             return new IntervalDictionary<K, VR>(keys
                 .Select(k => new { Intervalo = k, Valor = mixer(k, me.TryGetValue(k.Min), other.TryGetValue(k.Min)) })
                 .Where(a => a.Valor.HasInterval).Select(a => KVP.Create(a.Intervalo, a.Valor.Value)));
@@ -296,14 +299,18 @@ public static IntervalDictionary<K, VR> Mix<K, V1, V2, VR>(this IntervalDictiona
         public static IntervalDictionary<K, VR> Collapse<K, V, VR>(this IEnumerable<IntervalDictionary<K, V>> collection, Func<Interval<K>, IEnumerable<V>, VR> mixer)
             where K : struct, IComparable<K>, IEquatable<K>
         {
+#pragma warning disable CS8629 // Nullable value type may be null.
             Interval<K>[] keys = collection.SelectMany(a => a).SelectMany(a => a.Key.Elements()).Distinct().OrderBy().BiSelectS((min, max) => new Interval<K>(min.Value, max.Value)).ToArray();
+#pragma warning restore CS8629 // Nullable value type may be null.
             return new IntervalDictionary<K, VR>(keys.Select(k => KVP.Create(k, mixer(k, collection.Select(intDic => intDic.TryGetValue(k.Min)).Where(vi => vi.HasInterval).Select(vi => vi.Value)))));
         }
 
         public static IntervalDictionary<K, VR> AggregateIntervalDictionary<K, V, VR>(this IEnumerable<(Interval<K> interval, V value)> collection, Func<Interval<K>, IEnumerable<V>, VR> mixer)
            where K : struct, IComparable<K>, IEquatable<K>
         {
+#pragma warning disable CS8629 // Nullable value type may be null.
             Interval<K>[] keys = collection.SelectMany(a => a.interval.Elements()).Distinct().OrderBy().BiSelectS((min, max) => new Interval<K>(min.Value, max.Value)).ToArray();
+#pragma warning restore CS8629 // Nullable value type may be null.
             return new IntervalDictionary<K, VR>(keys.Select(k => KVP.Create(k, mixer(k, collection.Where(a => a.interval.Subset(k)).Select(a => a.value)))));
         }
 
diff --git a/Signum.Utilities/ExpressionTrees/CSharpRenderer.cs b/Signum.Utilities/ExpressionTrees/CSharpRenderer.cs
index 02603e942e..86c9aa2d62 100644
--- a/Signum.Utilities/ExpressionTrees/CSharpRenderer.cs
+++ b/Signum.Utilities/ExpressionTrees/CSharpRenderer.cs
@@ -132,7 +132,7 @@ public static string CleanIdentifiers(this string str)
                 .Replace("<>h__TransparentIdentifier", "τ");
         }
 
-        public static string Value(object obj)
+        public static string Value(object? obj)
         {
             if (obj == null)
                 return "null";
@@ -142,8 +142,7 @@ public static string Value(object obj)
 
             if (obj is string s)
                 return ToSrtringLiteral(s);
-
-            obj = obj!/*CSBUG*/;
+            
             if (obj.GetType().IsEnum)
                 return $"{obj.GetType().FullName}.{obj.ToString()}";
 
diff --git a/Signum.Utilities/ExpressionTrees/Query.cs b/Signum.Utilities/ExpressionTrees/Query.cs
index a77a961945..f5d77cbdbd 100644
--- a/Signum.Utilities/ExpressionTrees/Query.cs
+++ b/Signum.Utilities/ExpressionTrees/Query.cs
@@ -66,7 +66,7 @@ public override string ToString()
             if (expression is ConstantExpression ce && ce.Value == this)
                 return this.GetType().TypeName().CleanIdentifiers();
             else
-                return expression!/*CSBUG*/.ToString();
+                return expression.ToString();
         }
 
         public string QueryText
diff --git a/Signum.Utilities/ExpressionTrees/QueryableAsyncExtensions.cs b/Signum.Utilities/ExpressionTrees/QueryableAsyncExtensions.cs
index d36b708f33..51149897d0 100644
--- a/Signum.Utilities/ExpressionTrees/QueryableAsyncExtensions.cs
+++ b/Signum.Utilities/ExpressionTrees/QueryableAsyncExtensions.cs
@@ -50,7 +50,7 @@ static async Task<R> Bind<R>(CancellationToken cancellationToken, Expression<Fun
 
             var value = await provider.ExecuteAsync(mc2, cancellationToken);
 
-            return (R)value;
+            return (R)value!;
         }
 
         static Task<R> BindAsyncWithoutCancellationToken___<R>(Expression<Func<R>> bind)
diff --git a/Signum.Utilities/Extensions/Extensions.cs b/Signum.Utilities/Extensions/Extensions.cs
index d307374667..17f0972b4b 100644
--- a/Signum.Utilities/Extensions/Extensions.cs
+++ b/Signum.Utilities/Extensions/Extensions.cs
@@ -270,7 +270,7 @@ public static T ThrowIfNull<T>([EnsuresNotNull]this T? t, string message)
             return t.Value;
         }
 
-        public static T ThrowIfNull<T>([EnsuresNotNull]this T t, string message)
+        public static T ThrowIfNull<T>([EnsuresNotNull]this T? t, string message)
             where T : class
         {
             if (t == null)
diff --git a/Signum.Utilities/Extensions/ReflectionExtensions.cs b/Signum.Utilities/Extensions/ReflectionExtensions.cs
index bc00e7d943..7c02699bea 100644
--- a/Signum.Utilities/Extensions/ReflectionExtensions.cs
+++ b/Signum.Utilities/Extensions/ReflectionExtensions.cs
@@ -43,7 +43,7 @@ public static Type ReturningType(this MemberInfo m)
                 (m is MethodInfo mi) ? mi.ReturnType :
                 (m is ConstructorInfo ci) ? ci.DeclaringType :
                 (m is EventInfo ei) ? ei.EventHandlerType :
-                 throw new UnexpectedValueException(m! /*CSBUG*/);
+                 throw new UnexpectedValueException(m);
         }
 
         public static bool HasAttribute<T>(this ICustomAttributeProvider mi) where T : Attribute
diff --git a/Signum.Utilities/Extensions/StringExtensions.cs b/Signum.Utilities/Extensions/StringExtensions.cs
index 638c65c019..2f6cd282d7 100644
--- a/Signum.Utilities/Extensions/StringExtensions.cs
+++ b/Signum.Utilities/Extensions/StringExtensions.cs
@@ -4,6 +4,7 @@
 using System.IO;
 using System.Linq;
 using System.Linq.Expressions;
+using System.Runtime.CompilerServices;
 using System.Text;
 using System.Text.RegularExpressions;
 
@@ -15,7 +16,7 @@ public static class StringExtensions
         static readonly Expression<Func<string, bool>> HasTextExpression = str => (str ?? "").Length > 0;
 #pragma warning restore IDE0052 // Remove unread private members
         [ExpressionField("HasTextExpression")]
-        public static bool HasText(this string? str)
+        public static bool HasText([NotNullWhenTrue]this string? str)
         {
             return !string.IsNullOrEmpty(str);
         }
@@ -439,11 +440,8 @@ public static string Start(this string str, int numChars)
             return str.Substring(0, numChars);
         }
 
-        public static string? TryStart(this string? str, int numChars)
+        public static string TryStart(this string str, int numChars)
         {
-            if (str == null)
-                return null;
-
             if (numChars > str.Length)
                 return str;
 
@@ -458,11 +456,8 @@ public static string End(this string str, int numChars)
             return str.Substring(str.Length - numChars, numChars);
         }
 
-        public static string? TryEnd(this string? str, int numChars)
+        public static string TryEnd(this string str, int numChars)
         {
-            if (str == null)
-                return null;
-
             if (numChars > str.Length)
                 return str;
 
diff --git a/Signum.Utilities/Polymorphic.cs b/Signum.Utilities/Polymorphic.cs
index 68315a3424..e9d4720525 100644
--- a/Signum.Utilities/Polymorphic.cs
+++ b/Signum.Utilities/Polymorphic.cs
@@ -226,52 +226,62 @@ public static class PolymorphicExtensions
 
 
         public static void Register<T, S>(this Polymorphic<Action<T>> polymorphic, Action<S> action) where S : T
+            where T : class
         {
             polymorphic.SetDefinition(typeof(S), t => action((S)t));
         }
 
         public static void Register<T, S, P0>(this Polymorphic<Action<T, P0>> polymorphic, Action<S, P0> action) where S : T
+            where T : class
         {
             polymorphic.SetDefinition(typeof(S), (t, p0) => action((S)t, p0));
         }
 
         public static void Register<T, S, P0, P1>(this Polymorphic<Action<T, P0, P1>> polymorphic, Action<S, P0, P1> action) where S : T
+            where T : class
         {
             polymorphic.SetDefinition(typeof(S), (t, p0, p1) => action((S)t, p0, p1));
         }
 
         public static void Register<T, S, P0, P1, P2>(this Polymorphic<Action<T, P0, P1, P2>> polymorphic, Action<S, P0, P1, P2> action) where S : T
+            where T : class
         {
             polymorphic.SetDefinition(typeof(S), (t, p0, p1, p2) => action((S)t, p0, p1, p2));
         }
 
         public static void Register<T, S, P0, P1, P2, P3>(this Polymorphic<Action<T, P0, P1, P2, P3>> polymorphic, Action<S, P0, P1, P2, P3> action) where S : T
+            where T : class
         {
             polymorphic.SetDefinition(typeof(S), (t, p0, p1, p2, p3) => action((S)t, p0, p1, p2, p3));
         }
 
 
         public static void Register<T, S, R>(this Polymorphic<Func<T, R>> polymorphic, Func<S, R> func) where S : T
+            where T : class
         {
             polymorphic.SetDefinition(typeof(S), t => func((S)t));
         }
 
         public static void Register<T, S, P0, R>(this Polymorphic<Func<T, P0, R>> polymorphic, Func<S, P0, R> func) where S : T
+            where T : class
         {
             polymorphic.SetDefinition(typeof(S), (t, p0) => func((S)t, p0));
         }
 
         public static void Register<T, S, P0, P1, R>(this Polymorphic<Func<T, P0, P1, R>> polymorphic, Func<S, P0, P1, R> func) where S : T
+            where T : class
         {
             polymorphic.SetDefinition(typeof(S), (t, p0, p1) => func((S)t, p0, p1));
         }
 
         public static void Register<T, S, P0, P1, P2, R>(this Polymorphic<Func<T, P0, P1, P2, R>> polymorphic, Func<S, P0, P1, P2, R> func) where S : T
+            where T : class
         {
             polymorphic.SetDefinition(typeof(S), (t, p0, p1, p2) => func((S)t, p0, p1, p2));
         }
 
         public static void Register<T, S, P0, P1, P2, P3, R>(this Polymorphic<Func<T, P0, P1, P2, P3, R>> polymorphic, Func<S, P0, P1, P2, P3, R> func) where S : T
+            where T : class
         {
             polymorphic.SetDefinition(typeof(S), (t, p0, p1, p2, p3) => func((S)t, p0, p1, p2, p3));
         }
diff --git a/Signum.Utilities/Profiler/HeavyProfiler.cs b/Signum.Utilities/Profiler/HeavyProfiler.cs
index 556f5e2d16..458e4d609c 100644
--- a/Signum.Utilities/Profiler/HeavyProfiler.cs
+++ b/Signum.Utilities/Profiler/HeavyProfiler.cs
@@ -113,7 +113,7 @@ public static T LogValueNoStackTrace<T>(string role, Func<T> valueFactory)
         {
             long beforeStart = PerfCounter.Ticks;
          
-            if (enabled == false || TimeLimit.Value < beforeStart)
+            if (enabled == false || TimeLimit! < beforeStart)
             {
                 enabled = false;
                 Clean();
diff --git a/Signum.Utilities/Reflection/ReflectionTools.cs b/Signum.Utilities/Reflection/ReflectionTools.cs
index 89921a4441..0bcec9612f 100644
--- a/Signum.Utilities/Reflection/ReflectionTools.cs
+++ b/Signum.Utilities/Reflection/ReflectionTools.cs
@@ -403,7 +403,7 @@ public static T Parse<T>(string value)
                 return (T)(object)value;
 
             if (value == null || value == "")
-                return (T)(object?)null;
+                return (T)(object?)null!;
 
             Type utype = typeof(T).UnNullify();
             if (utype.IsEnum)
@@ -449,7 +449,7 @@ public static T Parse<T>(string value, CultureInfo culture)
                 return (T)(object)value;
 
             if (value == null || value == "")
-                return (T)(object?)null;
+                return (T)(object?)null!;
 
             Type utype = typeof(T).UnNullify();
             if (utype.IsEnum)
@@ -481,7 +481,7 @@ public static bool TryParse<T>(string value, out T result)
         {
             if (TryParse(value, typeof(T), CultureInfo.CurrentCulture, out object? objResult))
             {
-                result = (T)objResult;
+                result = (T)objResult!;
                 return true;
             }
             else
@@ -495,7 +495,7 @@ public static bool TryParse<T>(string value,  CultureInfo ci, out T result)
         {
             if (TryParse(value, typeof(T), ci, out object? objResult))
             {
-                result = (T)objResult;
+                result = (T)objResult!;
                 return true;
             }
             else
@@ -701,7 +701,7 @@ public static bool TryParse(string value, Type type, CultureInfo ci, out object?
         public static T ChangeType<T>(object value)
         {
             if (value == null)
-                return (T)(object?)null;
+                return (T)(object?)null!;
 
             if (value.GetType() == typeof(T))
                 return (T)value;
diff --git a/Signum.Utilities/Signum.Utilities.csproj b/Signum.Utilities/Signum.Utilities.csproj
index eadfd1b5af..0b16398a45 100644
--- a/Signum.Utilities/Signum.Utilities.csproj
+++ b/Signum.Utilities/Signum.Utilities.csproj
@@ -4,7 +4,7 @@
     <TargetFramework>netcoreapp2.2</TargetFramework>
     <LangVersion>8.0</LangVersion>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-    <NullableReferenceTypes>true</NullableReferenceTypes>
+    <NullableContextOptions>enable</NullableContextOptions>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <Platforms>x64</Platforms>
   </PropertyGroup>
diff --git a/Signum.Utilities/Statics.cs b/Signum.Utilities/Statics.cs
index 0eb566994d..01dc2aa263 100644
--- a/Signum.Utilities/Statics.cs
+++ b/Signum.Utilities/Statics.cs
@@ -8,7 +8,7 @@ namespace Signum.Utilities
 {
     public static class Statics
     {
-        static Dictionary<string, IThreadVariable> threadVariables = new Dictionary<string, IThreadVariable>();
+        static readonly Dictionary<string, IThreadVariable> threadVariables = new Dictionary<string, IThreadVariable>();
 
         public static ThreadVariable<T> ThreadVariable<T>(string name, bool avoidExportImport = false)
         {
@@ -56,7 +56,7 @@ public static void CleanThreadContextAndAssert()
                 throw new InvalidOperationException("The thread variable \r\n" + errors);
         }
 
-        static Dictionary<string, IUntypedVariable> sessionVariables = new Dictionary<string, IUntypedVariable>();
+        static readonly Dictionary<string, IUntypedVariable> sessionVariables = new Dictionary<string, IUntypedVariable>();
 
         public static SessionVariable<T> SessionVariable<T>(string name)
         {
@@ -101,7 +101,7 @@ public Variable(string name)
         public object? UntypedValue
         {
             get { return Value; }
-            set { Value = (T)value; }
+            set { Value = (T)value!; }
         }
 
         public bool IsClean
@@ -138,7 +138,7 @@ public interface IThreadVariable: IUntypedVariable
 
     public class ThreadVariable<T> : Variable<T>, IThreadVariable
     {
-        AsyncLocal<T> store = new AsyncLocal<T>();
+        readonly AsyncLocal<T> store = new AsyncLocal<T>();
 
         internal ThreadVariable(string name) : base(name) { }
 
@@ -158,7 +158,7 @@ public override void Clean()
 
     public abstract class SessionVariable<T>: Variable<T>
     {
-        public Func<T> ValueFactory { get; set; }
+        public abstract Func<T> ValueFactory { get; set; }
 
         protected internal SessionVariable(string name)
             : base(name)
@@ -191,7 +191,7 @@ public SessionVariable<T> CreateVariable<T>(string name)
 
         class VoidVariable<T> : SessionVariable<T>
         {
-            //public override Func<T> ValueFactory { get; set; }
+            public override Func<T> ValueFactory { get; set; }
 
             public VoidVariable(string name)
                 : base(name)
@@ -227,7 +227,7 @@ public SessionVariable<T> CreateVariable<T>(string name)
 
         class SingletonVariable<T> : SessionVariable<T>
         {
-            //public override Func<T> ValueFactory { get; set; }
+            public override Func<T> ValueFactory { get; set; }
 
             public SingletonVariable(string name)
                 : base(name)
@@ -238,7 +238,7 @@ public override T Value
                 get
                 {
                     if (singletonSession.TryGetValue(Name, out object? result))
-                        return (T)result;
+                        return (T)result!;
 
                     return GetDefaulValue();
                 }
@@ -289,20 +289,19 @@ public SessionVariable<T> CreateVariable<T>(string name)
 
         class OverrideableVariable<T> : SessionVariable<T>
         {
-            SessionVariable<T> variable;
+            readonly SessionVariable<T> variable;
 
             public OverrideableVariable(SessionVariable<T> variable)
                 : base(variable.Name)
             {
                 this.variable = variable;
             }
-
-            /*CSBUG*/
-            //public override Func<T> ValueFactory
-            //{
-            //    get { return variable.ValueFactory; }
-            //    set { variable.ValueFactory = value; }
-            //}
+            
+            public override Func<T> ValueFactory
+            {
+                get { return variable.ValueFactory; }
+                set { variable.ValueFactory = value; }
+            }
 
             public override T Value
             {
@@ -313,7 +312,7 @@ public override T Value
                     if (dic != null)
                     {
                         if (dic.TryGetValue(Name, out object? result))
-                            return (T)result;
+                            return (T)result!;
 
                         return GetDefaulValue();
                     }
diff --git a/Signum.Utilities/Synchronization/CultureInfoUtils.cs b/Signum.Utilities/Synchronization/CultureInfoUtils.cs
index f860657b1a..0f2290cee6 100644
--- a/Signum.Utilities/Synchronization/CultureInfoUtils.cs
+++ b/Signum.Utilities/Synchronization/CultureInfoUtils.cs
@@ -39,7 +39,7 @@ public static class CultureInfoUtils
             return ChangeCulture(CultureInfo.GetCultureInfo(cultureName));
         }
 
-        public static IDisposable? ChangeCulture(CultureInfo ci)
+        public static IDisposable? ChangeCulture(CultureInfo? ci)
         {
             if (ci == null)
                 return null;
diff --git a/Signum.Utilities/Synchronization/ResetLazy.cs b/Signum.Utilities/Synchronization/ResetLazy.cs
index ab5de3b2a6..7e3420c266 100644
--- a/Signum.Utilities/Synchronization/ResetLazy.cs
+++ b/Signum.Utilities/Synchronization/ResetLazy.cs
@@ -29,7 +29,7 @@ public ResetLazyStats(Type type)
 
 
     [ComVisible(false)]
-    public class ResetLazy<T>: IResetLazy where T : class
+    public class ResetLazy<T>: IResetLazy
     {
         class Box
         {

From 7664706e817ebf07ead2a2fd818f90d6b3a39927 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Mon, 28 Jan 2019 08:01:49 +0100
Subject: [PATCH 12/25] bring Try back to live

---
 Signum.Utilities/Extensions/Extensions.cs | 51 +++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/Signum.Utilities/Extensions/Extensions.cs b/Signum.Utilities/Extensions/Extensions.cs
index 17f0972b4b..ced4c0fa34 100644
--- a/Signum.Utilities/Extensions/Extensions.cs
+++ b/Signum.Utilities/Extensions/Extensions.cs
@@ -300,6 +300,57 @@ public static R Let<T, R>(this T t, Func<T, R> func)
             return func(t);
         }
 
+        public delegate R? TryCC<T, R>(T val) where T : class where R : class;
+        public static R? Try<T, R>(this T? t, TryCC<T, R> func) where T : class where R : class
+        {
+            if (t == null)
+                return null;
+            return func(t);
+        }
+
+        public delegate R TryCS<T, R>(T val) where T : class where R : struct;
+        public static R? Try<T, R>(this T? t, TryCS<T, R> func) where T : class where R : struct
+        {
+            if (t == null)
+                return null;
+            return func(t);
+        }
+
+        public delegate R? TryCN<T, R>(T val) where T : class where R : struct;
+        public static R? Try<T, R>(this T? t, TryCN<T, R> func) where T : class where R : struct
+        {
+            if (t == null)
+                return null;
+            return func(t);
+        }
+
+        public delegate R? TrySC<T, R>(T val) where T : struct where R : class;
+        public static R? Try<T, R>(this T? t, TrySC<T, R> func) where T : struct where R : class
+        {
+            if (t == null)
+                return null;
+            return func(t.Value);
+        }
+
+        public delegate R TrySS<T, R>(T val) where T : struct where R : struct;
+        public static R? Try<T, R>(this T? t, TrySS<T, R> func) where T : struct where R : struct
+        {
+            if (t == null)
+                return null;
+
+            return func(t.Value);
+        }
+
+        public delegate R? TrySN<T, R>(T val) where T : struct where R : struct;
+        public static R? Try<T, R>(this T? t, TrySN<T, R> func) where T : struct where R : struct
+        {
+            if (t == null)
+                return null;
+
+            return func(t.Value);
+        }
+
+
         public static T Do<T>(this T t, Action<T> action)
         {
             action(t);

From ec253447d53dc8935a5eff38f500310d5ce15920 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Mon, 28 Jan 2019 08:02:01 +0100
Subject: [PATCH 13/25] update tests

---
 Signum.Entities/Lite.cs                       |  4 +-
 Signum.Test/Environment/Entities.cs           | 50 +++++++++----------
 Signum.Test/Environment/MusicLoader.cs        |  6 +--
 Signum.Test/Environment/MusicLogic.cs         |  4 +-
 Signum.Test/Environment/MusicStarter.cs       |  2 +-
 Signum.Test/ExtensionsTest.cs                 |  2 +-
 Signum.Test/LinqProvider/GroupByTest.cs       |  8 +--
 Signum.Test/LinqProvider/OrderByTest.cs       |  4 +-
 .../LinqProvider/SelectImplementations.cs     | 10 ++--
 Signum.Test/LinqProvider/SelectNestedTest.cs  |  4 +-
 Signum.Test/LinqProvider/SelectTest.cs        | 20 ++++----
 Signum.Test/LinqProvider/UnsafeUpdateTest.cs  | 30 +++++------
 Signum.Test/LinqProvider/WhereTest.cs         |  8 +--
 Signum.Test/MetaTest.cs                       | 12 ++---
 Signum.Test/ObjectNameTest.cs                 | 10 ++--
 Signum.Test/Signum.Test.csproj                |  8 ++-
 16 files changed, 94 insertions(+), 88 deletions(-)

diff --git a/Signum.Entities/Lite.cs b/Signum.Entities/Lite.cs
index 277c83f517..480a095c86 100644
--- a/Signum.Entities/Lite.cs
+++ b/Signum.Entities/Lite.cs
@@ -412,7 +412,7 @@ public Expression Expand(Expression instance, Expression[] arguments, MethodInfo
 
 
         [MethodExpander(typeof(IsExpander))]
-        public static bool Is<T>(this T entity1, T entity2)
+        public static bool Is<T>(this T? entity1, T? entity2)
              where T : class, IEntity
         {
             if (entity1 == null && entity2 == null)
@@ -431,7 +431,7 @@ public static bool Is<T>(this T entity1, T entity2)
         }
 
         [MethodExpander(typeof(IsExpander))]
-        public static bool Is<T>(this Lite<T> lite1, Lite<T> lite2)
+        public static bool Is<T>(this Lite<T>? lite1, Lite<T>? lite2)
           where T : class, IEntity
         {
             if (lite1 == null && lite2 == null)
diff --git a/Signum.Test/Environment/Entities.cs b/Signum.Test/Environment/Entities.cs
index 07a33eafb6..02100c07f4 100644
--- a/Signum.Test/Environment/Entities.cs
+++ b/Signum.Test/Environment/Entities.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Signum.Entities;
@@ -16,14 +16,14 @@ namespace Signum.Test.Environment
     public class NoteWithDateEntity : Entity
     {
         [Nullable]
-        [StringLengthValidator(AllowNulls = false, Min = 3, MultiLine = true)]
+        [StringLengthValidator(Min = 3, MultiLine = true)]
         public string Text { get; set; }
 
         [ImplementedByAll]
         public IEntity Target { get; set; }
 
         [ImplementedByAll]
-        public Lite<IEntity> OtherTarget { get; set; }
+        public Lite<IEntity>? OtherTarget { get; set; }
 
         public DateTime CreationTime { get; set; }
 
@@ -38,7 +38,7 @@ public class ColaboratorsMixin : MixinEntity
     {
         ColaboratorsMixin(Entity mainEntity, MixinEntity next) : base(mainEntity, next) { }
 
-        [NotNullValidator, NoRepeatValidator]
+        [NoRepeatValidator]
         public MList<ArtistEntity> Colaborators { get; set; } = new MList<ArtistEntity>();
     }
 
@@ -53,7 +53,7 @@ public interface IAuthorEntity : IEntity
     {
         string Name { get; }
 
-        AwardEntity LastAward { get; }
+        AwardEntity? LastAward { get; }
 
         string FullName { get; }
 
@@ -63,7 +63,7 @@ public interface IAuthorEntity : IEntity
     [Serializable, EntityKind(EntityKind.Shared, EntityData.Transactional)]
     public class ArtistEntity : Entity, IAuthorEntity
     {
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 100)]
+        [StringLengthValidator(Min = 3, Max = 100)]
         public string Name { get; set; }
 
         public bool Dead { get; set; }
@@ -80,7 +80,7 @@ public bool IsMale
         }
 
         [ImplementedByAll]
-        public AwardEntity LastAward { get; set; }
+        public AwardEntity? LastAward { get; set; }
 
         static Expression<Func<ArtistEntity, IEnumerable<Lite<Entity>>>> FriendsCovariantExpression =
             a => a.Friends;
@@ -93,7 +93,7 @@ public IEnumerable<Lite<Entity>> FriendsCovariant()
         public MList<Lite<ArtistEntity>> Friends { get; set; } = new MList<Lite<ArtistEntity>>();
 
         [Ignore]
-        [NotNullValidator, NoRepeatValidator]
+        [NoRepeatValidator]
         public MList<AwardNominationEntity> Nominations { get; set; } = new MList<AwardNominationEntity>();
 
 
@@ -157,16 +157,16 @@ public enum Status
     public class BandEntity : Entity, IAuthorEntity
     {
         [UniqueIndex]
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 100)]
+        [StringLengthValidator(Min = 3, Max = 100)]
         public string Name { get; set; }
 
         [NotNullValidator]
         public MList<ArtistEntity> Members { get; set; } = new MList<ArtistEntity>();
 
         [ImplementedBy(typeof(GrammyAwardEntity), typeof(AmericanMusicAwardEntity))]
-        public AwardEntity LastAward { get; set; }
+        public AwardEntity? LastAward { get; set; }
 
-        [NotNullValidator, ImplementedBy(typeof(GrammyAwardEntity), typeof(AmericanMusicAwardEntity))]
+        [ImplementedBy(typeof(GrammyAwardEntity), typeof(AmericanMusicAwardEntity))]
         public MList<AwardEntity> OtherAwards { get; set; } = new MList<AwardEntity>();
 
         static Expression<Func<BandEntity, string>> FullNameExpression =
@@ -204,7 +204,7 @@ public abstract class AwardEntity : Entity
     {
         public int Year { get; set; }
 
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 100)]
+        [StringLengthValidator(Min = 3, Max = 100)]
         public string Category { get; set; }
 
         public AwardResult Result { get; set; }
@@ -242,12 +242,12 @@ public class PersonalAwardEntity : AwardEntity
     public class LabelEntity : Entity
     {
         [UniqueIndex]
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 100)]
+        [StringLengthValidator(Min = 3, Max = 100)]
         public string Name { get; set; }
 
         public CountryEntity Country { get; set; }
 
-        public Lite<LabelEntity> Owner { get; set; }
+        public Lite<LabelEntity>? Owner { get; set; }
 
         [UniqueIndex]
         public SqlHierarchyId Node { get; set; }
@@ -270,7 +270,7 @@ public static class LabelOperation
     public class CountryEntity : Entity
     {
         [UniqueIndex]
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 100)]
+        [StringLengthValidator(Min = 3, Max = 100)]
         public string Name { get; set; }
 
         public override string ToString()
@@ -283,20 +283,19 @@ public override string ToString()
     public class AlbumEntity : Entity, ISecretContainer
     {
         [UniqueIndex]
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 100)]
+        [StringLengthValidator(Min = 3, Max = 100)]
         public string Name { get; set; }
 
         [NumberBetweenValidator(1900, 2100)]
         public int Year { get; set; }
 
         [ImplementedBy(typeof(ArtistEntity), typeof(BandEntity))]
-        [NotNullValidator]
         public IAuthorEntity Author { get; set; }
 
-        [NotNullValidator, PreserveOrder]
+        [PreserveOrder]
         public MList<SongEmbedded> Songs { get; set; } = new MList<SongEmbedded>();
 
-        public SongEmbedded BonusTrack { get; set; }
+        public SongEmbedded? BonusTrack { get; set; }
 
         public LabelEntity Label { get; set; }
 
@@ -339,7 +338,7 @@ public static class AlbumOperation
     [Serializable]
     public class SongEmbedded : EmbeddedEntity
     {
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 100)]
+        [StringLengthValidator(Min = 3, Max = 100)]
         public string Name { get; set; }
 
         TimeSpan? duration;
@@ -371,6 +370,7 @@ public class AwardNominationEntity : Entity, ICanBeOrdered
         [ImplementedBy(typeof(ArtistEntity), typeof(BandEntity))]
         public Lite<IAuthorEntity> Author { get; set; }
 
+        [Nullable]
         [ImplementedBy(typeof(GrammyAwardEntity), typeof(PersonalAwardEntity), typeof(AmericanMusicAwardEntity))]
         public Lite<AwardEntity> Award { get; set; }
 
@@ -379,7 +379,7 @@ public class AwardNominationEntity : Entity, ICanBeOrdered
         public int Order { get; set; }
 
         [PreserveOrder]
-        [NotNullValidator, NoRepeatValidator]
+        [NoRepeatValidator]
         public MList<NominationPointEmbedded> Points { get; set; } = new MList<NominationPointEmbedded>();
     }
 
@@ -392,7 +392,7 @@ public class NominationPointEmbedded : EmbeddedEntity
     [Serializable, EntityKind(EntityKind.Main, EntityData.Transactional)]
     public class ConfigEntity : Entity
     {
-        public EmbeddedConfigEmbedded EmbeddedConfig { get; set; }
+        public EmbeddedConfigEmbedded? EmbeddedConfig { get; set; }
     }
 
     [AutoInit]
@@ -403,9 +403,9 @@ public static class ConfigOperation
 
     public class EmbeddedConfigEmbedded : EmbeddedEntity
     {
-        public Lite<LabelEntity> DefaultLabel { get; set; }
+        public Lite<LabelEntity>? DefaultLabel { get; set; }
 
-        [NotNullValidator, NoRepeatValidator]
+        [NoRepeatValidator]
         public MList<Lite<GrammyAwardEntity>> Awards { get; set; } = new MList<Lite<GrammyAwardEntity>>();
     }
 
@@ -455,7 +455,7 @@ public class IntValue : IView
     public class FolderEntity : Entity
     {
         [UniqueIndex]
-        [StringLengthValidator(AllowNulls = false, Max = 100)]
+        [StringLengthValidator(Max = 100)]
         public string Name { get; set; }
 
         public Lite<FolderEntity> Parent { get; set; }
diff --git a/Signum.Test/Environment/MusicLoader.cs b/Signum.Test/Environment/MusicLoader.cs
index 89b69fbc1a..fed9f01952 100644
--- a/Signum.Test/Environment/MusicLoader.cs
+++ b/Signum.Test/Environment/MusicLoader.cs
@@ -1,4 +1,4 @@
-using Microsoft.SqlServer.Types;
+using Microsoft.SqlServer.Types;
 using Signum.Engine;
 using Signum.Engine.Operations;
 using Signum.Entities;
@@ -112,7 +112,7 @@ public static void Load()
             new NoteWithDateEntity { CreationTime = new DateTime(2009, 6, 25, 0, 0, 0), Text = "Death on June, 25th", Target = michael }
                 .Execute(NoteWithDateOperation.Save);
 
-            new NoteWithDateEntity { CreationTime = new DateTime(2000, 1, 1, 0, 0, 0), Text = null, Target = michael }
+            new NoteWithDateEntity { CreationTime = new DateTime(2000, 1, 1, 0, 0, 0), Text = null!, Target = michael }
                 .SetMixin((CorruptMixin c) => c.Corrupt, true)
                 .Do(n => n.Mixin<ColaboratorsMixin>().Colaborators.Add(michael))
                 .Execute(NoteWithDateOperation.Save);
@@ -235,7 +235,7 @@ public static void Load()
             new AwardNominationEntity { Author = smashingPumpkins.ToLite(), Award = ama.ToLite() }.Save();
 
             new AwardNominationEntity { Author = michael.ToLite(), Award = pa.ToLite() }.Save();
-            new AwardNominationEntity { Author = michael.ToLite(), Award = null}.Save();
+            new AwardNominationEntity { Author = michael.ToLite(), Award = null!}.Save();
 
             new ConfigEntity
             {
diff --git a/Signum.Test/Environment/MusicLogic.cs b/Signum.Test/Environment/MusicLogic.cs
index ae5190c96f..3e9b4e6f7e 100644
--- a/Signum.Test/Environment/MusicLogic.cs
+++ b/Signum.Test/Environment/MusicLogic.cs
@@ -1,4 +1,4 @@
-using Signum.Engine;
+using Signum.Engine;
 using Signum.Engine.Basics;
 using Signum.Engine.DynamicQuery;
 using Signum.Engine.Maps;
@@ -237,7 +237,7 @@ public static void Register()
             new ConstructFrom<BandEntity>(AlbumOperation.CreateAlbumFromBand)
             {
                 ToStates = { AlbumState.Saved },
-                Construct = (BandEntity band, object[] args) =>
+                Construct = (BandEntity band, object[]? args) =>
                     new AlbumEntity
                     {
                         Author = band,
diff --git a/Signum.Test/Environment/MusicStarter.cs b/Signum.Test/Environment/MusicStarter.cs
index b81a12eeb6..4459b16416 100644
--- a/Signum.Test/Environment/MusicStarter.cs
+++ b/Signum.Test/Environment/MusicStarter.cs
@@ -66,7 +66,7 @@ public static void Start(string connectionString)
             if (!Schema.Current.Settings.TypeValues.ContainsKey(typeof(TimeSpan)))
             {
                 sb.Settings.FieldAttributes((AlbumEntity a) => a.Songs[0].Duration).Add(new Signum.Entities.IgnoreAttribute());
-                sb.Settings.FieldAttributes((AlbumEntity a) => a.BonusTrack.Duration).Add(new Signum.Entities.IgnoreAttribute());
+                sb.Settings.FieldAttributes((AlbumEntity a) => a.BonusTrack!.Duration).Add(new Signum.Entities.IgnoreAttribute());
             }
 
             if(sqlVersion > SqlServerVersion.SqlServer2008)
diff --git a/Signum.Test/ExtensionsTest.cs b/Signum.Test/ExtensionsTest.cs
index ac809f6a38..919e4b9da9 100644
--- a/Signum.Test/ExtensionsTest.cs
+++ b/Signum.Test/ExtensionsTest.cs
@@ -18,7 +18,7 @@ public void CartesianProduct()
         [Fact]
         public void DelegateOrder()
         {
-            Action action = null;
+            Action action = null!;
             action += A;
             action += B;
 
diff --git a/Signum.Test/LinqProvider/GroupByTest.cs b/Signum.Test/LinqProvider/GroupByTest.cs
index f74b9b0d62..39290ac6d1 100644
--- a/Signum.Test/LinqProvider/GroupByTest.cs
+++ b/Signum.Test/LinqProvider/GroupByTest.cs
@@ -1,4 +1,4 @@
-using Xunit;
+using Xunit;
 using Signum.Engine;
 using Signum.Entities;
 using Signum.Test.Environment;
@@ -577,7 +577,7 @@ where a.Songs.Count > 1
                             Last = a.Songs.OrderByDescending(s => s.Name).FirstOrDefault()
                         }).ToList();
 
-            Assert.True(list.All(a => a.FirstName != a.Last.Name));
+            Assert.True(list.All(a => a.FirstName != a.Last!/*CSBUG*/.Name));
         }
 
         [Fact]
@@ -593,7 +593,7 @@ where g.Count() > 1
                             Last = g.OrderByDescending(s => s.Name).FirstOrDefault()
                         }).ToList();
 
-            Assert.True(list.All(a => a.FirstName != a.Last.Name));
+            Assert.True(list.All(a => a.FirstName != a.Last!/*CSBUG*/.Name));
 
 
         }
@@ -612,7 +612,7 @@ where songs.Count > 1
                             Last = songs.OrderByDescending(s => s.Name).FirstOrDefault()
                         }).ToList();
 
-            Assert.True(list.All(a => a.FirstName != a.Last.Name));
+            Assert.True(list.All(a => a.FirstName != a.Last!/*CSBUG*/.Name));
 
 
         }
diff --git a/Signum.Test/LinqProvider/OrderByTest.cs b/Signum.Test/LinqProvider/OrderByTest.cs
index 9c4b50c8aa..c72a6064ca 100644
--- a/Signum.Test/LinqProvider/OrderByTest.cs
+++ b/Signum.Test/LinqProvider/OrderByTest.cs
@@ -138,7 +138,7 @@ public void OrderByIgnore()
                 Database.Query<AlbumEntity>().Where(a => a.Songs.OrderBy(s => s.Name).All(s => s.Name.StartsWith("a"))).Select(a => a.Id).ToList();
 
             using (AsserNoQueryWith("ORDER"))
-                Database.Query<AlbumEntity>().Where(a => a.Songs.OrderBy(s => s.Name).Contains(null)).Select(a => a.Id).ToList();
+                Database.Query<AlbumEntity>().Where(a => a.Songs.OrderBy(s => s.Name).Contains(null!)).Select(a => a.Id).ToList();
 
 
 
@@ -155,7 +155,7 @@ public void OrderByIgnore()
                 Database.Query<AlbumEntity>().OrderBy(a => a.Name).All(s => s.Name.StartsWith("a"));
 
             using (AsserNoQueryWith("ORDER"))
-                Database.Query<AlbumEntity>().OrderBy(a => a.Name).Contains(null);
+                Database.Query<AlbumEntity>().OrderBy(a => a.Name).Contains(null!);
         }
 
 
diff --git a/Signum.Test/LinqProvider/SelectImplementations.cs b/Signum.Test/LinqProvider/SelectImplementations.cs
index 8c377fbc79..5588358959 100644
--- a/Signum.Test/LinqProvider/SelectImplementations.cs
+++ b/Signum.Test/LinqProvider/SelectImplementations.cs
@@ -1,4 +1,4 @@
-using Xunit;
+using Xunit;
 using Signum.Engine;
 using Signum.Entities;
 using Signum.Test.Environment;
@@ -30,7 +30,7 @@ public void SelectType()
         public void SelectTypeNull()
         {
             var list = Database.Query<LabelEntity>()
-                .Select(a => new { Label = a.ToLite(), Owner = a.Owner, OwnerType = a.Owner.Entity.GetType() }).ToList();
+                .Select(a => new { Label = a.ToLite(), Owner = a.Owner, OwnerType = a.Owner!.Entity.GetType() }).ToList();
         }
 
         [Fact]
@@ -266,21 +266,21 @@ public void SelectCastIBPolymorphicSwitch()
         public void SelectCastIBPolymorphicForceNullify()
         {
             var list = (from a in Database.Query<AwardNominationEntity>()
-                        select (int?)a.Award.Entity.Year).ToList();
+                        select (int?)a.Award!.Entity.Year).ToList();
         }
 
         [Fact]
         public void SelectCastIBPolymorphicIBUnion()
         {
             var list = (from a in Database.Query<AlbumEntity>()
-                        select a.Author.CombineUnion().LastAward.ToLite()).ToList();
+                        select a.Author.CombineUnion().LastAward.Try(la => la.ToLite())).ToList();
         }
 
         [Fact]
         public void SelectCastIBPolymorphicIBSwitch()
         {
             var list = (from a in Database.Query<AlbumEntity>()
-                        select a.Author.CombineCase().LastAward.ToLite()).ToList();
+                        select a.Author.CombineCase().LastAward.Try(la => la.ToLite())).ToList();
         }
 
         [Fact]
diff --git a/Signum.Test/LinqProvider/SelectNestedTest.cs b/Signum.Test/LinqProvider/SelectNestedTest.cs
index 93c6134244..ecb33c31d1 100644
--- a/Signum.Test/LinqProvider/SelectNestedTest.cs
+++ b/Signum.Test/LinqProvider/SelectNestedTest.cs
@@ -1,4 +1,4 @@
-using System.Linq;
+using System.Linq;
 using Xunit;
 using Signum.Engine;
 using Signum.Entities;
@@ -40,7 +40,7 @@ public void SelecteNestedIB()
         public void SelecteNullableLookupColumns()
         {
             var neasted = (from l in Database.Query<LabelEntity>()
-                           join o in Database.Query<LabelEntity>().DefaultIfEmpty() on l.Owner.Entity equals o
+                           join o in Database.Query<LabelEntity>().DefaultIfEmpty() on l.Owner!.Entity equals o
                            group l.ToLite() by o.ToLite() into g
                            select new
                            {
diff --git a/Signum.Test/LinqProvider/SelectTest.cs b/Signum.Test/LinqProvider/SelectTest.cs
index f587b85d75..c717aeae04 100644
--- a/Signum.Test/LinqProvider/SelectTest.cs
+++ b/Signum.Test/LinqProvider/SelectTest.cs
@@ -90,7 +90,7 @@ public void SelectAnonymous()
         [Fact]
         public void SelectNoColumns()
         {
-            var list = Database.Query<AlbumEntity>().Select(a => new { DateTime.Now, Album = (AlbumEntity)null, Artist = (Lite<ArtistEntity>)null }).ToList();
+            var list = Database.Query<AlbumEntity>().Select(a => new { DateTime.Now, Album = (AlbumEntity?)null, Artist = (Lite<ArtistEntity>?)null }).ToList();
         }
 
         [Fact]
@@ -146,7 +146,7 @@ public void SelectConditionalToLite()
         public void SelectConditionalToLiteNull()
         {
             var list = (from l in Database.Query<LabelEntity>()
-                        let owner = (l.Owner == null ? null : l.Owner).Entity
+                        let owner = (l.Owner == null ? null : l.Owner)!.Entity
                         select owner.ToLite(owner.Name)).ToList();
         }
 #pragma warning restore IDE0029 // Use coalesce expression
@@ -162,7 +162,7 @@ public void SelectConditionalGetType()
         public void SelectCoallesceMember()
         {
             var list = (from l in Database.Query<LabelEntity>()
-                        select (l.Owner.Entity ?? l).Name).ToList();
+                        select (l.Owner!.Entity ?? l).Name).ToList();
 
         }
 
@@ -170,7 +170,7 @@ public void SelectCoallesceMember()
         public void SelectCoallesceToLite()
         {
             var list = (from l in Database.Query<LabelEntity>()
-                        select (l.Owner.Entity ?? l).ToLite()).ToList();
+                        select (l.Owner!.Entity ?? l).ToLite()).ToList();
 
         }
 
@@ -178,7 +178,7 @@ public void SelectCoallesceToLite()
         public void SelectCoallesceGetType()
         {
             var list = (from l in Database.Query<LabelEntity>()
-                        select (l.Owner.Entity ?? l).GetType()).ToList();
+                        select (l.Owner!.Entity ?? l).GetType()).ToList();
 
         }
 
@@ -400,7 +400,7 @@ public void SelectAvoidNominateEntity()
                  select new
                  {
                      a.Name,
-                     Friend = (Lite<BandEntity>)null
+                     Friend = (Lite<BandEntity>?)null
                  }).ToList();
         }
 
@@ -506,14 +506,14 @@ where mich.Name.Contains("Michael")
         [Fact]
         public void SelectIBAId()
         {
-            var list = Database.Query<ArtistEntity>().Select(a => (PrimaryKey?)a.LastAward.Id).ToList();
+            var list = Database.Query<ArtistEntity>().Select(a => a.LastAward.Try(la => la.Id)).ToList();
         }
 
         [Fact]
         public void SelectIBAIdObject()
         {
             var e = Assert.Throws<InvalidOperationException>(() =>
-                Database.Query<ArtistEntity>().Select(a => ((int?)a.LastAward.Id).InSql()).ToList());
+                Database.Query<ArtistEntity>().Select(a => a.LastAward.Try(la => (int?)la.Id).InSql()).ToList());
 
             Assert.Contains("translated", e.Message);
         }
@@ -562,7 +562,7 @@ public void SelectToStringLite()
         public void SelectConditionEnum()
         {
             var results = from b in Database.Query<BandEntity>()
-                          let ga = (GrammyAwardEntity)b.LastAward
+                          let ga = (GrammyAwardEntity?)b.LastAward
                           select (AwardResult?)(ga.Result < ga.Result ? (int)ga.Result : (int)ga.Result).InSql();
 
             results.ToList();
@@ -633,7 +633,7 @@ public void SelectView()
         [Fact]
         public void SelectRetrieve()
         {
-            var e = Assert.Throws<InvalidOperationException>(() => Database.Query<LabelEntity>().Select(l => l.Owner.Retrieve()).ToList());
+            var e = Assert.Throws<InvalidOperationException>(() => Database.Query<LabelEntity>().Select(l => l.Owner!.Retrieve()).ToList());
             Assert.Contains("not supported", e.Message);
         }
 
diff --git a/Signum.Test/LinqProvider/UnsafeUpdateTest.cs b/Signum.Test/LinqProvider/UnsafeUpdateTest.cs
index 09a0ef5ffa..43e3d6b395 100644
--- a/Signum.Test/LinqProvider/UnsafeUpdateTest.cs
+++ b/Signum.Test/LinqProvider/UnsafeUpdateTest.cs
@@ -51,7 +51,7 @@ public void UpdateValueNull()
         {
             using (Transaction tr = new Transaction())
             {
-                int count = Database.Query<NoteWithDateEntity>().UnsafeUpdate().Set(a => a.Text, a => null).Execute();
+                int count = Database.Query<NoteWithDateEntity>().UnsafeUpdate().Set(a => a.Text, a => null!).Execute();
                 //tr.Commit();
             }
 
@@ -112,7 +112,7 @@ public void UpdateEfie()
                 .Execute();
 
                 Assert.False(Database.Query<AlbumEntity>().Any(a => a.BonusTrack == null));
-                Assert.Equal("Mana Mana", Database.Query<AlbumEntity>().Select(a => a.BonusTrack.Name).Distinct().SingleEx());
+                Assert.Equal("Mana Mana", Database.Query<AlbumEntity>().Select(a => a.BonusTrack.Try(b => b.Name)).Distinct().SingleEx());
 
                 //tr.Commit();
             }
@@ -129,7 +129,7 @@ public void UpdateEfieNull()
                     .Execute();
 
                 Assert.True(Database.Query<AlbumEntity>().All(a => a.BonusTrack == null));
-                Assert.True(Database.Query<AlbumEntity>().All(a => a.BonusTrack.Name == null));
+                Assert.True(Database.Query<AlbumEntity>().All(a => a.BonusTrack.Try(bt => bt.Name) == null));
                 //tr.Commit();
             }
         }
@@ -150,7 +150,7 @@ public void UpdateEfieConditional()
                     .Set(a => a.BonusTrack, a => (int)a.Id % 2 == 0 ? song : null)
                 .Execute();
 
-                Assert.True(Database.Query<AlbumEntity>().All(a => (int)a.Id % 2 == 0 ? a.BonusTrack.Name == "Mana Mana" : a.BonusTrack.Name == null));
+                Assert.True(Database.Query<AlbumEntity>().All(a => (int)a.Id % 2 == 0 ? a.BonusTrack.Try(b => b.Name) == "Mana Mana" : a.BonusTrack.Try(b => b.Name) == null));
 
                 //tr.Commit();
             }
@@ -252,7 +252,7 @@ public void UpdateFieNull()
             using (Transaction tr = new Transaction())
             {
                 int count = Database.Query<AlbumEntity>().UnsafeUpdate()
-                    .Set(a => a.Label, a => null)
+                    .Set(a => a.Label, a => null!)
                     .Execute();
                 //tr.Commit();
             }
@@ -283,7 +283,7 @@ public void UpdateIbFieConditional()
                 ArtistEntity michael = Database.Query<ArtistEntity>().SingleEx(a => a.Dead);
 
                 int count = Database.Query<AlbumEntity>().UnsafeUpdate()
-                    .Set(a => a.Author, a => a.Id > 1 ? michael : null)
+                    .Set(a => a.Author, a => a.Id > 1 ? michael : null!)
                     .Execute();
                 //tr.Commit();
             }
@@ -295,7 +295,7 @@ public void UpdateIbNull()
             using (Transaction tr = new Transaction())
             {
                 int count = Database.Query<AlbumEntity>().UnsafeUpdate()
-                    .Set(a => a.Author, a => null)
+                    .Set(a => a.Author, a => null!)
                     .Execute();
                 //tr.Commit();
             }
@@ -336,7 +336,7 @@ public void UpdateIbaNull()
             using (Transaction tr = new Transaction())
             {
                 int count = Database.Query<NoteWithDateEntity>().UnsafeUpdate()
-                    .Set(a => a.Target, a => null)
+                    .Set(a => a.Target, a => null!)
                     .Execute();
                 //tr.Commit();
             }
@@ -364,7 +364,7 @@ public void UpdateIbaConditional()
                 ArtistEntity michael = Database.Query<ArtistEntity>().SingleEx(a => a.Dead);
 
                 int count = Database.Query<NoteWithDateEntity>().UnsafeUpdate()
-                    .Set(a => a.Target, a => a.CreationTime > DateTime.Now ? michael : null)
+                    .Set(a => a.Target, a => a.CreationTime > DateTime.Now ? michael : null!)
                     .Execute();
                 //tr.Commit();
             }
@@ -420,7 +420,7 @@ public void UpdateEmbeddedField()
             using (Transaction tr = new Transaction())
             {
                 int count = Database.Query<AlbumEntity>().UnsafeUpdate()
-                    .Set(a => a.BonusTrack.Name, a => a.BonusTrack.Name + " - ")
+                    .Set(a => a.BonusTrack!.Name, a => a.BonusTrack!.Name + " - ")
                     .Execute();
                 //tr.Commit();
             }
@@ -447,8 +447,8 @@ public void UnsafeUpdatePart()
             {
                 int count = Database.Query<AlbumEntity>()
                     .Select(a => new { a.Label, Album = a })
-                    .UnsafeUpdatePart(p => p.Label)
-                    .Set(a => a.Name, p => p.Label.Name + "/" + p.Album.Id)
+                    .UnsafeUpdatePart(p => p.Label!)
+                    .Set(a => a.Name, p => p.Label!.Name + "/" + p.Album!.Id)
                     .Execute();
 
                 var list = Database.Query<LabelEntity>().Select(a => a.Name);
@@ -515,7 +515,7 @@ from mle in a.MListElements(_ => _.Songs)
                              {
                                  LabelId = a.Label.Id,
                                  mle
-                             }).UnsafeUpdateMListPart(p => p.mle)
+                             }).UnsafeUpdateMListPart(p => p.mle!) /*CSBUG*/
                             .Set(mle => mle.Element.Seconds, p => (int)p.LabelId)
                             .Execute();
 
@@ -542,7 +542,7 @@ public void UnsafeUpdatePartExpand()
             using (Transaction tr = new Transaction())
             {
                 Database.Query<LabelEntity>()
-                    .UnsafeUpdatePart(lb => lb.Owner.Entity.Country)
+                    .UnsafeUpdatePart(lb => lb.Owner!.Entity.Country)
                     .Set(ctr => ctr.Name, lb => lb.Name)
                     .Execute();
             }
@@ -556,7 +556,7 @@ public void UnsafeUpdateNullableEmbeddedValue()
             {
                 Database.Query<AlbumEntity>()
                     .UnsafeUpdate()
-                    .Set(ctr => ctr.BonusTrack.Index, lb => 2)
+                    .Set(ctr => ctr.BonusTrack!.Index, lb => 2)
                     .Execute();
             }
         }
diff --git a/Signum.Test/LinqProvider/WhereTest.cs b/Signum.Test/LinqProvider/WhereTest.cs
index 47ee8fdb2a..7f5fbfde62 100644
--- a/Signum.Test/LinqProvider/WhereTest.cs
+++ b/Signum.Test/LinqProvider/WhereTest.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using Xunit;
 using Signum.Engine;
@@ -201,7 +201,7 @@ where a.Author is ArtistEntity
         [Fact]
         public void WhereRefersTo1()
         {
-            var lite = (Lite<BandEntity>)null;
+            var lite = (Lite<BandEntity>?)null;
 
             var first = Database.Query<BandEntity>().Where(b => lite.Is(b)).FirstOrDefault();
 
@@ -211,7 +211,7 @@ public void WhereRefersTo1()
         [Fact]
         public void WhereRefersTo2()
         {
-            var entity = (BandEntity)null;
+            var entity = (BandEntity?)null;
 
             var first = Database.Query<BandEntity>().Where(b => b.ToLite().Is(entity)).FirstOrDefault();
 
@@ -340,7 +340,7 @@ public void WhereOutsideIs()
         [Fact]
         public void WhereOutsideCast()
         {
-            var albums = Database.Query<BandEntity>().Where(a => ((PersonalAwardEntity)a.LastAward) != null).ToList();
+            var albums = Database.Query<BandEntity>().Where(a => ((PersonalAwardEntity?)a.LastAward) != null).ToList();
         }
 
         [Fact]
diff --git a/Signum.Test/MetaTest.cs b/Signum.Test/MetaTest.cs
index 5df6a643ca..c8d8957a37 100644
--- a/Signum.Test/MetaTest.cs
+++ b/Signum.Test/MetaTest.cs
@@ -66,7 +66,7 @@ join a in Database.Query<AlbumEntity>() on l equals a.Label
             Assert.IsType<CleanMeta>(dic["Name"]);
             Assert.IsType<DirtyMeta>(dic["Sum"]);
 
-            var metas = ((DirtyMeta)dic["Sum"]).CleanMetas;
+            var metas = ((DirtyMeta)dic["Sum"]!).CleanMetas;
             Assert.Equal("(Album).Name,(Label).Name", metas.SelectMany(cm => cm.PropertyRoutes).Distinct().ToString(","));
         }
 
@@ -81,7 +81,7 @@ join a in Database.Query<AlbumEntity>() on l equals a.Label into g
             Assert.IsType<CleanMeta>(dic["Name"]);
             Assert.IsType<DirtyMeta>(dic["Num"]);
 
-            Assert.True(((DirtyMeta)dic["Num"]).CleanMetas.Count == 0);
+            Assert.True(((DirtyMeta)dic["Num"]!).CleanMetas.Count == 0);
         }
 
         [Fact]
@@ -95,7 +95,7 @@ group a by a.Label into g
             Assert.IsType<CleanMeta>(dic["Key"]);
             Assert.IsType<DirtyMeta>(dic["Num"]);
 
-            Assert.True(((DirtyMeta)dic["Num"]).CleanMetas.Count == 0);
+            Assert.True(((DirtyMeta)dic["Num"]!).CleanMetas.Count == 0);
         }
 
         [Fact]
@@ -110,7 +110,7 @@ from s in a.Songs
             Assert.IsType<CleanMeta>(dic["Name"]);
             Assert.IsType<CleanMeta>(dic["Song"]);
 
-            Assert.Equal("(Album).Songs/Name", ((CleanMeta)dic["Song"]).PropertyRoutes[0].ToString());
+            Assert.Equal("(Album).Songs/Name", ((CleanMeta)dic["Song"]!).PropertyRoutes[0].ToString());
         }
 
         [Fact]
@@ -121,7 +121,7 @@ from a in Database.Query<AlbumEntity>()
                     select new { Author = (ArtistEntity)a.Author ?? (IAuthorEntity)(BandEntity)a.Author }
                     );
 
-            DirtyMeta meta = (DirtyMeta)dic["Author"];
+            DirtyMeta meta = (DirtyMeta)dic["Author"]!;
 
             Assert.Equal(meta.Implementations, Implementations.By(typeof(ArtistEntity), typeof(BandEntity)));
         }
@@ -134,7 +134,7 @@ from a in Database.Query<AlbumEntity>()
                     select new { Author = a.Id > 1 ? (ArtistEntity)a.Author : (IAuthorEntity)(BandEntity)a.Author }
                     );
 
-            DirtyMeta meta = (DirtyMeta)dic["Author"];
+            DirtyMeta meta = (DirtyMeta)dic["Author"]!;
 
             Assert.Equal(meta.Implementations, Implementations.By(typeof(ArtistEntity), typeof(BandEntity)));
         }
diff --git a/Signum.Test/ObjectNameTest.cs b/Signum.Test/ObjectNameTest.cs
index 52d6f8f8d8..28cacc0161 100644
--- a/Signum.Test/ObjectNameTest.cs
+++ b/Signum.Test/ObjectNameTest.cs
@@ -1,4 +1,4 @@
-using Xunit;
+using Xunit;
 using Signum.Engine.Maps;
 
 namespace Signum.Test
@@ -45,8 +45,8 @@ public void ParseServerName()
             var simple = ObjectName.Parse("[FROM].[SELECT].[WHERE].[TOP]");
             Assert.Equal("TOP", simple.Name);
             Assert.Equal("WHERE", simple.Schema.Name);
-            Assert.Equal("SELECT", simple.Schema.Database.Name);
-            Assert.Equal("FROM", simple.Schema.Database.Server.Name);
+            Assert.Equal("SELECT", simple.Schema.Database!.Name);
+            Assert.Equal("FROM", simple.Schema.Database!.Server!.Name);
         }
 
 
@@ -56,8 +56,8 @@ public void ParseServerNameSuperComplex()
             var simple = ObjectName.Parse("[FROM].[SELECT].[WHERE].[TOP.DISTINCT]");
             Assert.Equal("TOP.DISTINCT", simple.Name);
             Assert.Equal("WHERE", simple.Schema.Name);
-            Assert.Equal("SELECT", simple.Schema.Database.Name);
-            Assert.Equal("FROM", simple.Schema.Database.Server.Name);
+            Assert.Equal("SELECT", simple.Schema.Database!.Name);
+            Assert.Equal("FROM", simple.Schema.Database!.Server!.Name);
         }
     }
 }
diff --git a/Signum.Test/Signum.Test.csproj b/Signum.Test/Signum.Test.csproj
index 96ecf5bd41..785fd30a99 100644
--- a/Signum.Test/Signum.Test.csproj
+++ b/Signum.Test/Signum.Test.csproj
@@ -2,12 +2,18 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp2.2</TargetFramework>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>8.0</LangVersion>
     <UserSecretsId>SignumTest</UserSecretsId>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
+    <NullableContextOptions>enable</NullableContextOptions>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <NoWarn>1701;1702;8629;8618</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="dotMorten.Microsoft.SqlServer.Types" Version="1.1.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="2.2.0" />

From ad1d2dd9361764fd7b8d7d793ef9e7a0ae0a7526 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Tue, 29 Jan 2019 07:48:09 +0100
Subject: [PATCH 14/25] remove many CSBUG

---
 Signum.Engine/Connection/SqlConnector.cs      |  2 +-
 Signum.Engine/DynamicQuery/DynamicQuery.cs    |  8 +--
 Signum.Engine/Engine/SchemaSynchronizer.cs    |  4 +-
 Signum.Engine/Engine/SqlBuilder.cs            |  3 +-
 Signum.Engine/Engine/SqlPreCommand.cs         |  6 +--
 Signum.Engine/Linq/DbQueryProvider.cs         |  2 +-
 .../ChildProjectionFlattener.cs               |  2 +-
 .../Linq/ExpressionVisitor/ColumnProjector.cs |  1 -
 .../ExpressionVisitor/ConditionsRewriter.cs   |  4 +-
 .../DbExpressionNominator.cs                  | 10 ++--
 .../Linq/ExpressionVisitor/EntityCompleter.cs |  2 +-
 .../OverloadingSimplifier.cs                  |  2 +-
 .../Linq/ExpressionVisitor/QueryBinder.cs     | 53 ++++++++-----------
 .../Linq/ExpressionVisitor/QueryFormatter.cs  |  2 +-
 .../ExpressionVisitor/TranslatorBuilder.cs    |  2 +-
 Signum.Engine/Linq/Meta/MetadataVisitor.cs    | 10 ++--
 Signum.Engine/Patterns/DeletePart.cs          |  4 +-
 Signum.Engine/Schema/Schema.Basics.cs         |  6 +--
 Signum.Engine/Schema/Schema.Expressions.cs    |  6 +--
 .../Schema/SchemaBuilder/SchemaBuilder.cs     | 15 +++---
 Signum.React/Signum.React.csproj              |  6 +--
 Signum.Utilities/ExpressionTrees/Query.cs     |  2 +-
 .../ExpressionTrees/QueryProvider.cs          |  4 +-
 23 files changed, 69 insertions(+), 87 deletions(-)

diff --git a/Signum.Engine/Connection/SqlConnector.cs b/Signum.Engine/Connection/SqlConnector.cs
index cb7dbfaf8e..ecf73140f0 100644
--- a/Signum.Engine/Connection/SqlConnector.cs
+++ b/Signum.Engine/Connection/SqlConnector.cs
@@ -387,7 +387,7 @@ Exception ReplaceException(Exception ex, SqlPreCommandSimple command)
                 }
             }
 
-            return ex! /*CSBUG*/;
+            return ex;
         }
 
         protected internal override void BulkCopy(DataTable dt, ObjectName destinationTable, SqlBulkCopyOptions options, int? timeout)
diff --git a/Signum.Engine/DynamicQuery/DynamicQuery.cs b/Signum.Engine/DynamicQuery/DynamicQuery.cs
index 0db3f0f21e..b384e4f294 100644
--- a/Signum.Engine/DynamicQuery/DynamicQuery.cs
+++ b/Signum.Engine/DynamicQuery/DynamicQuery.cs
@@ -678,7 +678,7 @@ public static async Task<DEnumerableCount<T>> TryPaginateAsync<T>(this DQueryabl
                 return new DEnumerableCount<T>(listTask, query.Context, countTask);
             }
 
-            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination!.GetType().Name)); /*CSBUG*/
+            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination.GetType().Name));
         }
 
         public static DEnumerableCount<T> TryPaginate<T>(this DQueryable<T> query, Pagination pagination)
@@ -713,7 +713,7 @@ public static DEnumerableCount<T> TryPaginate<T>(this DQueryable<T> query, Pagin
                 return new DEnumerableCount<T>(list, query.Context, count);
             }
 
-            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination!.GetType().Name)); /*CSBUG*/
+            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination.GetType().Name));
         }
 
         public static DEnumerableCount<T> TryPaginate<T>(this DEnumerable<T> collection, Pagination pagination)
@@ -751,7 +751,7 @@ public static DEnumerableCount<T> TryPaginate<T>(this DEnumerable<T> collection,
                 return new DEnumerableCount<T>(list, collection.Context, totalElements ?? collection.Collection.Count());
             }
 
-            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination!.GetType().Name)); /*CSBUG*/
+            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination.GetType().Name));
         }
 
         public static DEnumerableCount<T> TryPaginate<T>(this DEnumerableCount<T> collection, Pagination pagination)
@@ -780,7 +780,7 @@ public static DEnumerableCount<T> TryPaginate<T>(this DEnumerableCount<T> collec
                 return new DEnumerableCount<T>(c, collection.Context, collection.TotalElements);
             }
 
-            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination!.GetType().Name));/*CSBUG*/
+            throw new InvalidOperationException("pagination type {0} not expexted".FormatWith(pagination.GetType().Name));
         }
 
         #endregion
diff --git a/Signum.Engine/Engine/SchemaSynchronizer.cs b/Signum.Engine/Engine/SchemaSynchronizer.cs
index d132c09c00..80a2d1c1a2 100644
--- a/Signum.Engine/Engine/SchemaSynchronizer.cs
+++ b/Signum.Engine/Engine/SchemaSynchronizer.cs
@@ -518,9 +518,7 @@ public static string GetDefaultValue(ITable table, IColumn column, Replacements
 
                 return $"CONVERT(datetime2, '{date:yyyy-MM-dd HH:mm:ss.fffffff}')";
             }
-
-            column = column!; /*CSBUG*/
-
+            
             string typeDefault = forceDefaultValue ??
                 (SqlBuilder.IsNumber(column.SqlDbType) ? "0" :
                 SqlBuilder.IsString(column.SqlDbType) ? "''" :
diff --git a/Signum.Engine/Engine/SqlBuilder.cs b/Signum.Engine/Engine/SqlBuilder.cs
index c132db966b..a68e036227 100644
--- a/Signum.Engine/Engine/SqlBuilder.cs
+++ b/Signum.Engine/Engine/SqlBuilder.cs
@@ -211,7 +211,6 @@ public static string CreateColumn(IColumn c, DefaultConstraint? constraint)
                 null;
 
             var defaultConstraint = constraint != null ? $"CONSTRAINT {constraint.Name} DEFAULT " + constraint.QuotedDefinition : null;
-            c = c!;/*CSBUG*/
 
             return $" ".Combine(
                 c.Name.SqlEscape(),
@@ -316,7 +315,7 @@ public static SqlPreCommand CreateIndex(Index index, Replacements? checkUnique)
             }
             else
             {
-                return CreateIndexBasic(index! /*CSBUG*/, forHistoryTable: false);
+                return CreateIndexBasic(index, forHistoryTable: false);
             }
         }
 
diff --git a/Signum.Engine/Engine/SqlPreCommand.cs b/Signum.Engine/Engine/SqlPreCommand.cs
index a4953cedd9..97a7e6e5ad 100644
--- a/Signum.Engine/Engine/SqlPreCommand.cs
+++ b/Signum.Engine/Engine/SqlPreCommand.cs
@@ -179,16 +179,16 @@ internal static string Encode(object value)
             if (value is bool b)
                 return (b ? 1 : 0).ToString();
 
-            if (Schema.Current.Settings.UdtSqlName.TryGetValue(value!.GetType() /*CSBUG*/, out var name))
+            if (Schema.Current.Settings.UdtSqlName.TryGetValue(value.GetType(), out var name))
                 return "CAST('{0}' AS {1})".FormatWith(value, name);
 
-            if (value!.GetType().IsEnum /*CSBUG*/)
+            if (value.GetType().IsEnum)
                 return Convert.ToInt32(value).ToString();
 
             if (value is byte[] bytes)
                 return "0x" + BitConverter.ToString(bytes).Replace("-", "");
 
-            return value!.ToString(); /*CSBUG*/
+            return value.ToString();
         }
 
         protected internal override void PlainSql(StringBuilder sb)
diff --git a/Signum.Engine/Linq/DbQueryProvider.cs b/Signum.Engine/Linq/DbQueryProvider.cs
index 1cde442546..5f50200e3a 100644
--- a/Signum.Engine/Linq/DbQueryProvider.cs
+++ b/Signum.Engine/Linq/DbQueryProvider.cs
@@ -31,7 +31,7 @@ public SqlPreCommandSimple GetMainSqlCommand(Expression expression)
             return this.Translate(expression, tr => tr.MainCommand);
         }
 
-        public override object Execute(Expression expression) /*CSBUG*/
+        public override object? Execute(Expression expression)
         {
             using (HeavyProfiler.Log("DBQuery", () => expression.Type.TypeName()))
                 return this.Translate(expression, tr => tr.Execute()!);
diff --git a/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs b/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs
index a24344c1a7..ebcc154314 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/ChildProjectionFlattener.cs
@@ -248,7 +248,7 @@ private static IEnumerable<ColumnExpression> KeysTable(TableExpression table)
                 if (table.Table is Table t && t.IsView)
                     yield return new ColumnExpression(typeof(int), table.Alias, t.Columns.Values.Single(a => a.PrimaryKey).Name);
                 else
-                    yield return new ColumnExpression(typeof(int), table.Alias, table!.Table.PrimaryKey.Name); /*CSBUG*/
+                    yield return new ColumnExpression(typeof(int), table.Alias, table.Table.PrimaryKey.Name);
             }
 
             private static IEnumerable<ColumnExpression> KeysSelect(SelectExpression select)
diff --git a/Signum.Engine/Linq/ExpressionVisitor/ColumnProjector.cs b/Signum.Engine/Linq/ExpressionVisitor/ColumnProjector.cs
index 9ee029e943..57bc2bcb2f 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/ColumnProjector.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/ColumnProjector.cs
@@ -135,7 +135,6 @@ public override Expression Visit(Expression expression)
                 }
                 else
                 {
-                    expression = expression! /*CSBUG*/;
                     if (expression.Type.UnNullify().IsEnum)
                     {
                         var convert = expression.TryConvert(expression.Type.IsNullable() ? typeof(int?) : typeof(int));
diff --git a/Signum.Engine/Linq/ExpressionVisitor/ConditionsRewriter.cs b/Signum.Engine/Linq/ExpressionVisitor/ConditionsRewriter.cs
index 149dacebf9..f0c30b34fc 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/ConditionsRewriter.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/ConditionsRewriter.cs
@@ -113,8 +113,8 @@ static bool IsSqlCondition(Expression expression)
                     return false;
             }
 
-            var exp = expression as DbExpression;
-            switch (exp!.DbNodeType) /*CSBUG*/
+            var exp = (DbExpression)expression;
+            switch (exp.DbNodeType)
             {
                 case DbExpressionType.Exists:
                 case DbExpressionType.Like:
diff --git a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
index e168f98f94..3d519cb28e 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/DbExpressionNominator.cs
@@ -667,8 +667,8 @@ private bool ExtractDayOfWeek(Expression exp, out Expression? result)
                 return true;
             }
 
-            if (exp!/*CSBUG*/.NodeType == ExpressionType.Convert && exp!/*CSBUG*/.Type.UnNullify() == typeof(DayOfWeek))
-                return ExtractDayOfWeek(((UnaryExpression)exp!/*CSBUG*/).Operand, out result);
+            if (exp.NodeType == ExpressionType.Convert && exp.Type.UnNullify() == typeof(DayOfWeek))
+                return ExtractDayOfWeek(((UnaryExpression)exp).Operand, out result);
 
             result = null;
             return false;
@@ -732,12 +732,12 @@ private Expression ConvertToSqlCoallesce(BinaryExpression b)
             if (left is SqlFunctionExpression fLeft && fLeft.SqlFunction == SqlFunction.COALESCE.ToString())
                 expressions.AddRange(fLeft.Arguments);
             else
-                expressions.Add(left!/*CSBUG*/);
+                expressions.Add(left);
 
             if (right is SqlFunctionExpression fRight && fRight.SqlFunction == SqlFunction.COALESCE.ToString())
                 expressions.AddRange(fRight.Arguments);
             else
-                expressions.Add(right!/*CSBUG*/);
+                expressions.Add(right);
 
             return Add(new SqlFunctionExpression(b.Type, null, SqlFunction.COALESCE.ToString(), expressions));
         }
@@ -901,8 +901,6 @@ protected override Expression VisitConditional(ConditionalExpression c)
                 }
                 else
                 {
-                    ifFalse = ifFalse!; /*CSBUG*/
-
                     if (ifTrue.IsNull() && ifFalse.IsNull())
                         return ifTrue; //cond? null: null doesn't work in sql
 
diff --git a/Signum.Engine/Linq/ExpressionVisitor/EntityCompleter.cs b/Signum.Engine/Linq/ExpressionVisitor/EntityCompleter.cs
index 8819a55069..bb282d13b4 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/EntityCompleter.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/EntityCompleter.cs
@@ -184,7 +184,7 @@ protected internal override Expression VisitAdditionalField(AdditionalFieldExpre
             if (newEx is ProjectionExpression newProj && newProj.Projector.Type.IsInstantiationOf(typeof(MList<>.RowIdElement)))
                 return new MListProjectionExpression(afe.Type, newProj);
 
-            return newEx!; /*CSBUG*/
+            return newEx;
         }
 
         protected internal override Expression VisitProjection(ProjectionExpression proj)
diff --git a/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs b/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
index e1eb73d666..eb780e0653 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
@@ -471,7 +471,7 @@ private Expression CallToString(Expression expression)
             var visitedToStrExp = Visit(toStrExp);
 
             return Expression.Condition(
-                Expression.Equal(expression, Expression.Constant(null, expression!/*CSBUG*/.Type.Nullify())),
+                Expression.Equal(expression, Expression.Constant(null, expression.Type.Nullify())),
                 Expression.Constant(null, typeof(string)),
                 Visit(visitedToStrExp));
         }
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
index 2466d16d64..6cb6754b98 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
@@ -224,7 +224,7 @@ private Expression BindExpandEntity(Type type, Expression source, LambdaExpressi
                             kvp => kvp.Key,
                             kvp => kvp.Value.WithExpandEntity(expandEntity)));
 
-                    throw new NotImplementedException("Expand Entity not supported for " + e!/*CSBUG*/.GetType());
+                    throw new NotImplementedException("Expand Entity not supported for " + e.GetType());
                 });
 
             return new ProjectionExpression(projection.Select, newProjector, projection.UniqueFunction, projection.Type);
@@ -279,7 +279,7 @@ private Expression ChangeProjector(int index, MemberInfo[] members, Expression p
                     ee = Completed(ee);
 
 
-                    var fi = m as FieldInfo ?? Reflector.FindFieldInfo(m!/*CSBUG*/.DeclaringType, (PropertyInfo)m! /*CSBUG*/);
+                    var fi = m as FieldInfo ?? Reflector.FindFieldInfo(m.DeclaringType, (PropertyInfo)m);
 
                     var newBinding = ChangeProjector(index + 1, members, ee.GetBinding(fi), changeExpression);
 
@@ -291,7 +291,7 @@ private Expression ChangeProjector(int index, MemberInfo[] members, Expression p
                 }
                 else if (projector is NewExpression ne)
                 {
-                    var p = (PropertyInfo)m! /*CSBUG*/;
+                    var p = (PropertyInfo)m;
 
                     var mIndex = ne.Members.IndexOf(pi => ReflectionTools.PropertyEquals((PropertyInfo)pi, p));
 
@@ -322,7 +322,7 @@ private Expression ChangeProjector(int index, MemberInfo[] members, Expression p
                 }
             }
 
-            throw new NotImplementedException($"ChangeProjector not implemented for projector of type {projector!/*CSBUG*/.Type} and member {m}");
+            throw new NotImplementedException($"ChangeProjector not implemented for projector of type {projector.Type} and member {m}");
         }
 
         string? currentTableHint;
@@ -366,7 +366,7 @@ private Expression MapVisitExpand(LambdaExpression lambda, ProjectionExpression
             return MapVisitExpand(lambda, projection.Projector, projection.Select);
         }
 
-        internal Expression MapVisitExpand(LambdaExpression lambda, Expression projector, SourceExpression? source)
+        internal Expression MapVisitExpand(LambdaExpression lambda, Expression projector, SourceExpression source)
         {
             using (SetCurrentSource(source))
             {
@@ -890,7 +890,7 @@ private Expression BindAnyAll(Type resultType, Expression source, LambdaExpressi
                 if (predicate != null)
                     source = Expression.Call(typeof(Enumerable), "Where", method.GetGenericArguments(), source, predicate);
 
-                ProjectionExpression projection = this.VisitCastProjection(source!/*CSBUG*/);
+                ProjectionExpression projection = this.VisitCastProjection(source);
                 Expression result = new ExistsExpression(projection.Select);
                 if (isAll)
                     result = Expression.Not(result);
@@ -1231,14 +1231,14 @@ private Expression GetOrderExpression(LambdaExpression lambda, ProjectionExpress
                 {
                     expr = ((MethodCallExpression)expr).Arguments[0];
                 }
-                else if (expr!/*CSBUG*/.Type == typeof(Type))
+                else if (expr.Type == typeof(Type))
                 {
-                    expr = ExtractTypeId(expr!/*CSBUG*/);
+                    expr = ExtractTypeId(expr);
                 }
 
-                if (expr!/*CSBUG*/.Type.UnNullify() == typeof(PrimaryKey))
+                if (expr.Type.UnNullify() == typeof(PrimaryKey))
                 {
-                    expr = SmartEqualizer.UnwrapPrimaryKey(expr!/*CSBUG*/);
+                    expr = SmartEqualizer.UnwrapPrimaryKey(expr);
                 }
 
                 return DbExpressionNominator.FullNominate(expr)!;
@@ -1460,14 +1460,14 @@ public Expression BindMethodCall(MethodCallExpression m)
 
                     return toStr;
                 }
-                else if (source!/*CSBUG*/.NodeType == ExpressionType.Convert && source!/*CSBUG*/.Type.UnNullify().IsEnum)
+                else if (source.NodeType == ExpressionType.Convert && source.Type.UnNullify().IsEnum)
                 {
-                    var table = Schema.Current.Table(EnumEntity.Generate(source!/*CSBUG*/.Type.UnNullify()));
+                    var table = Schema.Current.Table(EnumEntity.Generate(source.Type.UnNullify()));
 
                     if (table != null)
                     {
-                        var ee = new EntityExpression(EnumEntity.Generate(source!/*CSBUG*/.Type.UnNullify()),
-                            new PrimaryKeyExpression(((UnaryExpression)source!/*CSBUG*/).Operand.Nullify()), null, null, null, null, null, false);
+                        var ee = new EntityExpression(EnumEntity.Generate(source.Type.UnNullify()),
+                            new PrimaryKeyExpression(((UnaryExpression)source).Operand.Nullify()), null, null, null, null, null, false);
 
                         return Completed(ee).GetBinding(EntityExpression.ToStrField);
                     }
@@ -1573,7 +1573,7 @@ private ConditionalExpression DispatchConditional(MethodCallExpression m, Expres
                 }
             }
 
-            source = RemoveProjectionConvert(source!/*CSBUG*/);
+            source = RemoveProjectionConvert(source);
 
             switch (source.NodeType)
             {
@@ -1968,7 +1968,7 @@ internal static PrimaryKeyExpression ExtractTypeId(Expression exp)
                     TypeConstant(imp.Key).Nullify(), acum)));
             }
 
-            throw new InvalidOperationException("Impossible to extract TypeId from {0}".FormatWith(exp!/*CSBUG*/.ToString()));
+            throw new InvalidOperationException("Impossible to extract TypeId from {0}".FormatWith(exp.ToString()));
         }
 
         protected override Expression VisitInvocation(InvocationExpression iv)
@@ -2217,7 +2217,7 @@ internal CommandExpression BindDelete(Expression source)
                 commands.Add(new DeleteExpression(vn, false, pr.Select, SmartEqualizer.EqualNullable(id, eee.GetViewId())));
             }
             else
-                throw new InvalidOperationException("Delete not supported for {0}".FormatWith(pr.Projector!/*CSBUG*/.GetType().TypeName()));
+                throw new InvalidOperationException("Delete not supported for {0}".FormatWith(pr.Projector.GetType().TypeName()));
 
             commands.Add(new SelectRowCountExpression());
 
@@ -2242,7 +2242,7 @@ internal CommandExpression BindUpdate(Expression source, LambdaExpression? partS
                 entity is EntityExpression entEx ? (ITable)entEx.Table :
                 entity is EmbeddedEntityExpression eeEx ? (ITable)eeEx.ViewTable!:
                 entity is MListElementExpression mlistEx ? (ITable)mlistEx.Table!:
-                throw new UnexpectedValueException(entity!/*CSBUG*/);
+                throw new UnexpectedValueException(entity);
 
             Alias alias = aliasGenerator.Table(table.Name);
 
@@ -2303,7 +2303,7 @@ internal CommandExpression BindUpdate(Expression source, LambdaExpression? partS
                 table = eee.ViewTable!;
             }
             else
-                throw new InvalidOperationException("Update not supported for {0}".FormatWith(entity!/*CSBUG*/.GetType().TypeName()));
+                throw new InvalidOperationException("Update not supported for {0}".FormatWith(entity.GetType().TypeName()));
 
 
             var result = new CommandAggregateExpression(new CommandExpression[]
@@ -2349,8 +2349,6 @@ internal CommandExpression BindInsert(Expression source, LambdaExpression constr
                 assignments.Add(new ColumnAssignment(entityTable.Ticks.Name, Expression.Constant(0L, typeof(long))));
             }
 
-            table = table!; /*CSBUG*/
-
             var isHistory = this.systemTime is SystemTime.HistoryTable;
 
             var result = new CommandAggregateExpression(new CommandExpression[]
@@ -2554,9 +2552,9 @@ public UnionAllRequest Completed(ImplementedByExpression ib)
 
         ImmutableStack<SourceExpression> currentSource = ImmutableStack<SourceExpression>.Empty;
 
-        public IDisposable SetCurrentSource(SourceExpression? source)
+        public IDisposable SetCurrentSource(SourceExpression source)
         {
-            this.currentSource = currentSource.Push(source!/*CSBUG*/);
+            this.currentSource = currentSource.Push(source);
             return new Disposable(() => currentSource = currentSource.Pop());
         }
 
@@ -2690,8 +2688,6 @@ public PrimaryKeyExpression GetId(Expression expression)
                 return aggregate;
             }
 
-            expression = expression!;/*CSBUG*/
-
             if (expression.NodeType == ExpressionType.Conditional)
             {
                 var con = (ConditionalExpression)expression;
@@ -2735,8 +2731,6 @@ public Expression GetIdString(Expression expression)
             if (expression is ImplementedByAllExpression iba)
                 return iba.Id;
 
-            expression = expression!; /*CSBUG*/
-
             if (expression.NodeType == ExpressionType.Conditional)
             {
                 var con = (ConditionalExpression)expression;
@@ -2781,7 +2775,6 @@ public Expression GetEntityType(Expression expression)
                 return iba.TypeId;
             }
 
-            expression = expression!; /*CSBUG*/
             if (expression.NodeType == ExpressionType.Conditional)
             {
                 var con = (ConditionalExpression)expression;
@@ -2866,7 +2859,7 @@ internal ProjectionExpression MListProjection(MListExpression mle, bool withRowI
 
             var parentEntity = new EntityExpression(af.Route.RootType, af.BackID, af.ExternalPeriod, null, null, null, null, false);
 
-            var expression = this.MapVisitExpand(cleanLambda, parentEntity, null);
+            var expression = this.MapVisitExpand(cleanLambda, parentEntity, null!);
 
             if(expression is MethodCallExpression mce)
             {
@@ -3213,7 +3206,7 @@ select Expression.Or(
                     source = new JoinExpression(JoinType.SingleRowLeftOuterJoin, source, unionAll, condition);
                 }
 
-                r!/*CSBUG*/.Consumed = true;
+                r.Consumed = true;
             }
             return source;
         }
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs
index 51a76f2db7..8cc7ffb875 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryFormatter.cs
@@ -674,7 +674,7 @@ protected internal override SourceExpression VisitSource(SourceExpression source
             else
                 this.VisitJoin((JoinExpression)source);
 
-            return source!; /*CSBUG*/
+            return source;
         }
 
         protected internal override Expression VisitJoin(JoinExpression join)
diff --git a/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs b/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs
index 1c9d1d6855..bc7aed2a05 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs
@@ -189,7 +189,7 @@ static internal Expression<Func<IProjectionRow, T>> Build<T>(Expression expressi
             Expression NullifyColumn(Expression exp)
             {
                 if (!(exp is ColumnExpression ce))
-                    return exp!; /*CSBUG*/
+                    return exp;
 
                 if (ce.Type.IsNullable() || ce.Type.IsClass)
                     return ce;
diff --git a/Signum.Engine/Linq/Meta/MetadataVisitor.cs b/Signum.Engine/Linq/Meta/MetadataVisitor.cs
index ba3d5be742..6aba1266c4 100644
--- a/Signum.Engine/Linq/Meta/MetadataVisitor.cs
+++ b/Signum.Engine/Linq/Meta/MetadataVisitor.cs
@@ -224,8 +224,6 @@ public static MetaProjectorExpression AsProjection(Expression expression)
             if (expression is MetaProjectorExpression mpe)
                 return mpe;
 
-            expression = expression!; /*CSBUG*/
-
             if (expression.NodeType == ExpressionType.New)
             {
                 NewExpression nex = (NewExpression)expression;
@@ -245,7 +243,7 @@ public static MetaProjectorExpression AsProjection(Expression expression)
                             new CleanMeta(route.TryGetImplementations(), route)));
                 }
 
-                return new MetaProjectorExpression(expression!/*CSBUG*/.Type, MakeVoidMeta(elementType));
+                return new MetaProjectorExpression(expression.Type, MakeVoidMeta(elementType));
             }
 
             throw new InvalidOperationException();
@@ -450,8 +448,6 @@ static Expression BindMember(Expression source, MemberInfo member, Type memberTy
                 throw new InvalidOperationException("Property {0} not found on {1}".FormatWith(member.Name, mme.Type.TypeName()));
             }
 
-            source = source! /*CSBUG*/;
-
             if (typeof(ModifiableEntity).IsAssignableFrom(source.Type) || typeof(IEntity).IsAssignableFrom(source.Type))
             {
                 var pi = member as PropertyInfo ?? Reflector.TryFindPropertyInfo((FieldInfo)member);
@@ -581,7 +577,7 @@ protected override Expression VisitBinary(BinaryExpression b)
                     mLeft.Meta.Implementations.Value }) :
                 (Implementations?)null;
 
-            return MakeDirtyMeta(b.Type, imps, left!, right!); /*CSBUG*/
+            return MakeDirtyMeta(b.Type, imps, left, right);
         }
 
         protected override Expression VisitConditional(ConditionalExpression c)
@@ -598,7 +594,7 @@ protected override Expression VisitConditional(ConditionalExpression c)
                     mIfFalse.Meta.Implementations.Value }) :
                 (Implementations?)null;
 
-            return MakeDirtyMeta(c.Type, imps, Visit(c.Test), ifTrue!, ifFalse!); /*CSBUG*/
+            return MakeDirtyMeta(c.Type, imps, Visit(c.Test), ifTrue, ifFalse);
         }
     }
 }
diff --git a/Signum.Engine/Patterns/DeletePart.cs b/Signum.Engine/Patterns/DeletePart.cs
index 2e31ad37ef..062317efe0 100644
--- a/Signum.Engine/Patterns/DeletePart.cs
+++ b/Signum.Engine/Patterns/DeletePart.cs
@@ -10,7 +10,7 @@ namespace Signum.Engine
 {
     public static class DeletePart
     {
-        static readonly Variable<ImmutableStack<Type/*?*/>> avoidTypes = Statics.ThreadVariable<ImmutableStack<Type>>("avoidDeletePart"); /*CSBUG*/ 
+        static readonly Variable<ImmutableStack<Type?>> avoidTypes = Statics.ThreadVariable<ImmutableStack<Type?>>("avoidDeletePart"); /*CSBUG*/ 
  
         public static bool ShouldAvoidDeletePart(Type partType)
         {
@@ -21,7 +21,7 @@ public static bool ShouldAvoidDeletePart(Type partType)
         /// <param name="partType">Use null for every type</param>
         public static IDisposable AvoidDeletePart(Type partType)
         {
-            avoidTypes.Value = (avoidTypes.Value ?? ImmutableStack<Type>.Empty).Push(partType);
+            avoidTypes.Value = (avoidTypes.Value ?? ImmutableStack<Type?>.Empty).Push(partType);
 
             return new Disposable(() => avoidTypes.Value = avoidTypes.Value.Pop());
         }
diff --git a/Signum.Engine/Schema/Schema.Basics.cs b/Signum.Engine/Schema/Schema.Basics.cs
index 6926fe18fe..e64e20fd81 100644
--- a/Signum.Engine/Schema/Schema.Basics.cs
+++ b/Signum.Engine/Schema/Schema.Basics.cs
@@ -162,9 +162,7 @@ public Field GetField(MemberInfo member)
                     return Mixins.GetOrThrow(mi.GetGenericArguments().Single());
                 }
             }
-
-            member = member! /*CSBUG*/;
-
+            
             FieldInfo fi = member as FieldInfo ?? Reflector.FindFieldInfo(Type, (PropertyInfo)member);
 
             if (fi == null)
@@ -192,8 +190,6 @@ public Field GetField(MemberInfo member)
                 return Mixins?.TryGetC((Type)member);
             }
 
-            member = member!; /*CSBUG*/
-
             FieldInfo fi = member as FieldInfo ??  Reflector.TryFindFieldInfo(Type, (PropertyInfo)member)!;
 
             if (fi == null)
diff --git a/Signum.Engine/Schema/Schema.Expressions.cs b/Signum.Engine/Schema/Schema.Expressions.cs
index 78861c1f8b..f1c6746231 100644
--- a/Signum.Engine/Schema/Schema.Expressions.cs
+++ b/Signum.Engine/Schema/Schema.Expressions.cs
@@ -108,12 +108,12 @@ ColumnExpression ITablePrivate.GetPrimaryOrder(Alias alias)
         {
             var res = GetIdExpression(alias);
 
-            return res is PrimaryKeyExpression ?
-                (ColumnExpression)((PrimaryKeyExpression)res!).Value : /*CSBUG*/
+            return res is PrimaryKeyExpression pe?
+                (ColumnExpression)pe.Value :
                 (ColumnExpression)res!;
         }
     }
-
+    
     public partial class TableMList
     {
         internal PrimaryKeyExpression RowIdExpression(Alias tableAlias)
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
index 80a0a30c36..40cd0bb8e5 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
@@ -637,13 +637,16 @@ protected virtual FieldImplementedBy GenerateFieldImplementedBy(ITable table, Pr
 
             bool avoidForeignKey = Settings.FieldAttribute<AvoidForeignKeyAttribute>(route) != null;
 
-            var implementations = types.ToDictionary(t => t, t => new ImplementationColumn(
-                name: name.Add(TypeLogic.GetCleanName(t)).ToString(),
-                referenceTable: Include(t, route)
-                )
+            var implementations = types.ToDictionary<Type, Type, ImplementationColumn>(t => t, t =>
             {
-                Nullable = nullable,
-                AvoidForeignKey = avoidForeignKey,
+                var rt = Include(t, route);
+
+                string impName = name.Add(TypeLogic.GetCleanName(t)).ToString();
+                return new ImplementationColumn(impName, referenceTable: rt)
+                {
+                    Nullable = nullable,
+                    AvoidForeignKey = avoidForeignKey,
+                };
             });
 
             return new FieldImplementedBy(route, implementations)
diff --git a/Signum.React/Signum.React.csproj b/Signum.React/Signum.React.csproj
index 19eee7f830..05cf381940 100644
--- a/Signum.React/Signum.React.csproj
+++ b/Signum.React/Signum.React.csproj
@@ -3,10 +3,10 @@
   <PropertyGroup>
     <TargetFramework>netcoreapp2.2</TargetFramework>
     <TypeScriptToolsVersion>3.2</TypeScriptToolsVersion>
-    <LangVersion>latest</LangVersion>
-    <OutputType>Library</OutputType>
+    <LangVersion>8.0</LangVersion>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-    <StartupObject></StartupObject>
+    <NullableContextOptions>enable</NullableContextOptions>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
diff --git a/Signum.Utilities/ExpressionTrees/Query.cs b/Signum.Utilities/ExpressionTrees/Query.cs
index f5d77cbdbd..9dd97aab83 100644
--- a/Signum.Utilities/ExpressionTrees/Query.cs
+++ b/Signum.Utilities/ExpressionTrees/Query.cs
@@ -53,7 +53,7 @@ public IQueryProvider Provider
         [DebuggerStepThrough]
         public IEnumerator<T> GetEnumerator()
         {
-            return ((IEnumerable<T>)this.provider.Execute(this.expression)).GetEnumerator();
+            return ((IEnumerable<T>)this.provider.Execute(this.expression)!).GetEnumerator();
         }
 
         IEnumerator IEnumerable.GetEnumerator()
diff --git a/Signum.Utilities/ExpressionTrees/QueryProvider.cs b/Signum.Utilities/ExpressionTrees/QueryProvider.cs
index aa5c60823d..e24dd963b0 100644
--- a/Signum.Utilities/ExpressionTrees/QueryProvider.cs
+++ b/Signum.Utilities/ExpressionTrees/QueryProvider.cs
@@ -37,7 +37,7 @@ IQueryable IQueryProvider.CreateQuery(Expression expression)
 
         S IQueryProvider.Execute<S>(Expression expression)
         {
-            return (S)this.Execute(expression);
+            return (S)this.Execute(expression)!;
         }
 
         object? IQueryProvider.Execute(Expression expression)
@@ -46,6 +46,6 @@ S IQueryProvider.Execute<S>(Expression expression)
         }
 
         public abstract string GetQueryText(Expression expression);
-        public abstract object Execute(Expression expression);
+        public abstract object? Execute(Expression expression);
     }
 }

From 305f1e9978fd85ac04b3392b3935d12254076a1b Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Tue, 29 Jan 2019 19:31:11 +0100
Subject: [PATCH 15/25] more on not nullables

---
 Signum.Engine/DynamicQuery/AutoDynamicQuery.cs |  2 +-
 Signum.Engine/DynamicQuery/DynamicQuery.cs     |  2 +-
 .../Linq/ExpressionVisitor/QueryBinder.cs      |  3 +++
 .../RedundantSubqueryRemover.cs                |  6 +++---
 .../Linq/ExpressionVisitor/SmartEqualizer.cs   |  8 ++++----
 Signum.Engine/Linq/Meta/MetadataVisitor.cs     | 10 ++++++----
 .../SchemaBuilder/SchemaBuilderSettings.cs     |  6 +++---
 Signum.Entities/Basics/Exception.cs            |  2 +-
 Signum.Entities/FieldAttributes.cs             |  4 ++--
 .../Filters/SignumExceptionFilterAttribute.cs  | 12 ++++++------
 Signum.Test/Environment/Entities.cs            |  4 ++--
 Signum.Test/MetaTest.cs                        | 18 +++++++++---------
 Signum.Test/ObjectNameTest.cs                  |  1 +
 Signum.Utilities/NotNullAttributes.cs          | 16 ++++++++++++++++
 14 files changed, 58 insertions(+), 36 deletions(-)

diff --git a/Signum.Engine/DynamicQuery/AutoDynamicQuery.cs b/Signum.Engine/DynamicQuery/AutoDynamicQuery.cs
index 84a40fdea5..5d5915dbd3 100644
--- a/Signum.Engine/DynamicQuery/AutoDynamicQuery.cs
+++ b/Signum.Engine/DynamicQuery/AutoDynamicQuery.cs
@@ -21,7 +21,7 @@ public AutoDynamicQueryCore(IQueryable<T> query)
         {
             this.Query = query;
 
-            metas = DynamicQueryCore.QueryMetadata(Query);
+            metas = DynamicQueryCore.QueryMetadata(Query).ThrowIfNull("Query should be an anoynmous type");
 
             StaticColumns = MemberEntryFactory.GenerateList<T>(MemberOptions.Properties | MemberOptions.Fields)
               .Select((e, i) => new ColumnDescriptionFactory(i, e.MemberInfo, metas[e.MemberInfo.Name])).ToArray();
diff --git a/Signum.Engine/DynamicQuery/DynamicQuery.cs b/Signum.Engine/DynamicQuery/DynamicQuery.cs
index b384e4f294..da11b3f249 100644
--- a/Signum.Engine/DynamicQuery/DynamicQuery.cs
+++ b/Signum.Engine/DynamicQuery/DynamicQuery.cs
@@ -113,7 +113,7 @@ public static AutoDynamicQueryCore<T> FromSelector<E, T>(Expression<Func<E, T>>
             return new AutoDynamicQueryCore<T>(Database.Query<E>().Select(selector));
         }
 
-        public static Dictionary<string, Meta?> QueryMetadata(IQueryable query)
+        public static Dictionary<string, Meta?>? QueryMetadata(IQueryable query)
         {
             return MetadataVisitor.GatherMetadata(query.Expression);
         }
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
index 6cb6754b98..9a4080d9ab 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
@@ -3153,6 +3153,9 @@ public static Expression ExpandJoins(Expression expression, QueryBinder binder,
 
         protected internal override SourceExpression VisitSource(SourceExpression source)
         {
+            if (source == null)
+                return null!;
+
             var reqs = requests.TryGetC(source);
 
             //if (reqs != null)
diff --git a/Signum.Engine/Linq/ExpressionVisitor/RedundantSubqueryRemover.cs b/Signum.Engine/Linq/ExpressionVisitor/RedundantSubqueryRemover.cs
index 53173dbd49..2089253b0b 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/RedundantSubqueryRemover.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/RedundantSubqueryRemover.cs
@@ -160,7 +160,7 @@ protected internal override Expression VisitSelect(SelectExpression select)
                 // logic except for the existence of a where clause
                 while (CanMergeWithFrom(select, wasTopLevel))
                 {
-                    SelectExpression? fromSelect = GetLeftMostSelect(select.From!);
+                    SelectExpression fromSelect = GetLeftMostSelect(select.From!)!;
 
                     // remove the redundant subquery
                     select = (SelectExpression)SubqueryRemover.Remove(select, new[] { fromSelect });
@@ -253,7 +253,7 @@ static bool CanMergeWithFrom(SelectExpression select, bool isTopLevel)
                 return true;
             }
 
-            static SelectExpression GetLeftMostSelect(Expression source)
+            static SelectExpression? GetLeftMostSelect(Expression source)
             {
                 if (source is SelectExpression select)
                     return select;
@@ -261,7 +261,7 @@ static SelectExpression GetLeftMostSelect(Expression source)
                 if (source is JoinExpression join)
                     return GetLeftMostSelect(join.Left);
 
-                throw new UnexpectedValueException(source);
+                return null;
             }
 
             static bool HasApplyJoin(SourceExpression source)
diff --git a/Signum.Engine/Linq/ExpressionVisitor/SmartEqualizer.cs b/Signum.Engine/Linq/ExpressionVisitor/SmartEqualizer.cs
index 3804d4d2df..f5ec035b3a 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/SmartEqualizer.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/SmartEqualizer.cs
@@ -318,8 +318,8 @@ public static Expression UnwrapPrimaryKey(Expression unary)
 
         private static Expression? ConditionalEquals(Expression exp1, Expression exp2)
         {
-            if (Schema.Current.Settings.IsDbType(exp1.Type)||
-                Schema.Current.Settings.IsDbType(exp2.Type))
+            if (Schema.Current.Settings.IsDbType(exp1.Type.UnNullify())||
+                Schema.Current.Settings.IsDbType(exp2.Type.UnNullify()))
                 return null;
 
             if (exp1 is ConditionalExpression ce1)
@@ -341,8 +341,8 @@ private static Expression DispachConditional(ConditionalExpression ce, Expressio
 
         private static Expression? CoalesceEquals(Expression exp1, Expression exp2)
         {
-            if (Schema.Current.Settings.IsDbType(exp1.Type)||
-                Schema.Current.Settings.IsDbType(exp2.Type))
+            if (Schema.Current.Settings.IsDbType(exp1.Type.UnNullify()) ||
+                Schema.Current.Settings.IsDbType(exp2.Type.UnNullify()))
                 return null;
 
             if (exp1.NodeType == ExpressionType.Coalesce)
diff --git a/Signum.Engine/Linq/Meta/MetadataVisitor.cs b/Signum.Engine/Linq/Meta/MetadataVisitor.cs
index 6aba1266c4..f9a6573e27 100644
--- a/Signum.Engine/Linq/Meta/MetadataVisitor.cs
+++ b/Signum.Engine/Linq/Meta/MetadataVisitor.cs
@@ -24,7 +24,7 @@ internal class MetadataVisitor : ExpressionVisitor
 
         private MetadataVisitor() { }
 
-        static internal Dictionary<string, Meta?> GatherMetadata(Expression expression)
+        static internal Dictionary<string, Meta?>? GatherMetadata(Expression expression)
         {
             if (expression == null)
                 throw new ArgumentException("expression");
@@ -34,14 +34,16 @@ private MetadataVisitor() { }
 
             Expression? simplified = MetaEvaluator.Clean(expression);
 
-            var meta = (MetaProjectorExpression)new MetadataVisitor().Visit(simplified!);
-            
+            var meta = (MetaProjectorExpression?)new MetadataVisitor().Visit(simplified!);
+            if (meta == null)
+                return null;
+
             var proj = meta.Projector;
 
             if (proj.NodeType != ExpressionType.New &&  //anonymous types
                 proj.NodeType != ExpressionType.MemberInit && // not-anonymous type
                 !(proj is MetaExpression && ((MetaExpression)proj).IsEntity)) // raw-entity!
-                throw new UnexpectedValueException(proj);
+                return null;
 
             PropertyInfo[] props = proj.Type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
 
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
index 4f1349e974..0b5b0b9be8 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
@@ -211,10 +211,10 @@ internal IsNullable GetIsNullable(PropertyRoute propertyRoute, bool forceNull)
 
         private IsNullable GetIsNullablePrivate(PropertyRoute propertyRoute)
         {
-            if (FieldAttribute<NotNullableAttribute>(propertyRoute) != null)
+            if (FieldAttribute<ForceNotNullableAttribute>(propertyRoute) != null)
                 return IsNullable.No;
 
-            if (FieldAttribute<NullableAttribute>(propertyRoute) != null)
+            if (FieldAttribute<ForceNullableAttribute>(propertyRoute) != null)
                 return IsNullable.Yes;
 
             if (propertyRoute.PropertyRouteType == PropertyRouteType.MListItems)
@@ -366,7 +366,7 @@ public SqlDbTypePair GetSqlDbTypePair(Type type)
 
         public bool IsDbType(Type type)
         {
-            return type.IsEnum || GetSqlDbTypePair(type) != null;
+            return type.IsEnum || TryGetSqlDbTypePair(type) != null;
         }
 
     }
diff --git a/Signum.Entities/Basics/Exception.cs b/Signum.Entities/Basics/Exception.cs
index 49c40de353..282a85c521 100644
--- a/Signum.Entities/Basics/Exception.cs
+++ b/Signum.Entities/Basics/Exception.cs
@@ -28,7 +28,7 @@ public ExceptionEntity(Exception ex)
 
         public DateTime CreationDate { get; private set; } = TimeZoneManager.Now;
 
-        [NotNullable, SqlDbType(Size = 100)]
+        [ForceNotNullable, SqlDbType(Size = 100)]
         public string? ExceptionType { get; set; }
 
         [SqlDbType(Size = int.MaxValue)]
diff --git a/Signum.Entities/FieldAttributes.cs b/Signum.Entities/FieldAttributes.cs
index b076e3d841..b3ee96e33a 100644
--- a/Signum.Entities/FieldAttributes.cs
+++ b/Signum.Entities/FieldAttributes.cs
@@ -226,7 +226,7 @@ public sealed class FieldWithoutPropertyAttribute : Attribute
     }
 
     [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
-    public sealed class NotNullableAttribute : Attribute
+    public sealed class ForceNotNullableAttribute : Attribute
     {
     }
 
@@ -236,7 +236,7 @@ public sealed class NotNullableAttribute : Attribute
     /// This attribute is only necessary in the case an entity field is not-nullable but you can not make the DB column nullable because of legacy data, or cycles in a graph of entities.
     /// </summary>
     [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
-    public sealed class NullableAttribute : Attribute
+    public sealed class ForceNullableAttribute: Attribute
     {
     }
 
diff --git a/Signum.React/Filters/SignumExceptionFilterAttribute.cs b/Signum.React/Filters/SignumExceptionFilterAttribute.cs
index 3e2b6b4a5e..73ef544505 100644
--- a/Signum.React/Filters/SignumExceptionFilterAttribute.cs
+++ b/Signum.React/Filters/SignumExceptionFilterAttribute.cs
@@ -72,11 +72,11 @@ public async Task OnResourceExecutionAsync(ResourceExecutingContext precontext,
             }
         }
 
-        private string Try(int size, Func<string> getValue)
+        private string? Try(int size, Func<string?> getValue)
         {
             try
             {
-                return getValue().TryStart(size);
+                return getValue()?.TryStart(size);
             }
             catch(Exception e)
             {
@@ -96,9 +96,9 @@ public string ReadAllBody(HttpContext httpContext)
             return Encoding.UTF8.GetString(httpContext.Request.Body.ReadAllBytes());
         }
 
-        private object TryGetProp(HttpContext context, string key)
+        private object? TryGetProp(HttpContext context, string key)
         {
-            object result = null;
+            object? result;
             context.Items.TryGetValue(key, out result);
             return result;
         }
@@ -134,10 +134,10 @@ public HttpError(Exception e)
             this.InnerException = e.InnerException == null ? null : new HttpError(e.InnerException);
         }
 
-        public string ExceptionId;
+        public string? ExceptionId;
         public string ExceptionMessage;
         public string ExceptionType;
         public string StackTrace;
-        public HttpError InnerException;
+        public HttpError? InnerException;
     }
 }
diff --git a/Signum.Test/Environment/Entities.cs b/Signum.Test/Environment/Entities.cs
index 02100c07f4..91a05885e6 100644
--- a/Signum.Test/Environment/Entities.cs
+++ b/Signum.Test/Environment/Entities.cs
@@ -15,7 +15,7 @@ namespace Signum.Test.Environment
         Mixin(typeof(ColaboratorsMixin)), PrimaryKey(typeof(Guid))]
     public class NoteWithDateEntity : Entity
     {
-        [Nullable]
+        [ForceNullable]
         [StringLengthValidator(Min = 3, MultiLine = true)]
         public string Text { get; set; }
 
@@ -370,7 +370,7 @@ public class AwardNominationEntity : Entity, ICanBeOrdered
         [ImplementedBy(typeof(ArtistEntity), typeof(BandEntity))]
         public Lite<IAuthorEntity> Author { get; set; }
 
-        [Nullable]
+        [ForceNullable]
         [ImplementedBy(typeof(GrammyAwardEntity), typeof(PersonalAwardEntity), typeof(AmericanMusicAwardEntity))]
         public Lite<AwardEntity> Award { get; set; }
 
diff --git a/Signum.Test/MetaTest.cs b/Signum.Test/MetaTest.cs
index c8d8957a37..a101ba23f2 100644
--- a/Signum.Test/MetaTest.cs
+++ b/Signum.Test/MetaTest.cs
@@ -26,14 +26,14 @@ public void MetaNoMetadata()
         [Fact]
         public void MetaRawEntity()
         {
-            var dic = DynamicQueryCore.QueryMetadata(Database.Query<NoteWithDateEntity>());
+            var dic = DynamicQueryCore.QueryMetadata(Database.Query<NoteWithDateEntity>())!;
             Assert.NotNull(dic);
         }
 
         [Fact]
         public void MetaAnonymousType()
         {
-            var dic = DynamicQueryCore.QueryMetadata(Database.Query<NoteWithDateEntity>().Select(a => new { a.Target, a.Text, a.ToString().Length, Sum = a.ToString() + a.ToString() }));
+            var dic = DynamicQueryCore.QueryMetadata(Database.Query<NoteWithDateEntity>().Select(a => new { a.Target, a.Text, a.ToString().Length, Sum = a.ToString() + a.ToString() }))!;
             Assert.IsType<CleanMeta>(dic["Target"]);
             Assert.IsType<CleanMeta>(dic["Text"]);
             Assert.IsType<DirtyMeta>(dic["Length"]);
@@ -49,7 +49,7 @@ public class Bla
         [Fact]
         public void MetaNamedType()
         {
-            var dic = DynamicQueryCore.QueryMetadata(Database.Query<NoteWithDateEntity>().Select(a => new Bla { ToStr = a.ToString(), Length = a.ToString().Length }));
+            var dic = DynamicQueryCore.QueryMetadata(Database.Query<NoteWithDateEntity>().Select(a => new Bla { ToStr = a.ToString(), Length = a.ToString().Length }))!;
             Assert.IsType<CleanMeta>(dic["ToStr"]);
             Assert.IsType<DirtyMeta>(dic["Length"]);
         }
@@ -60,7 +60,7 @@ public void MetaComplexJoin()
             var dic = DynamicQueryCore.QueryMetadata(
                     from l in Database.Query<LabelEntity>()
                     join a in Database.Query<AlbumEntity>() on l equals a.Label
-                    select new { Label = l.Name, Name = a.Name, Sum = l.Name.Length + a.Name });
+                    select new { Label = l.Name, Name = a.Name, Sum = l.Name.Length + a.Name })!;
 
             Assert.IsType<CleanMeta>(dic["Label"]);
             Assert.IsType<CleanMeta>(dic["Name"]);
@@ -76,7 +76,7 @@ public void MetaComplexJoinGroup()
             var dic = DynamicQueryCore.QueryMetadata(
                       from l in Database.Query<LabelEntity>()
                       join a in Database.Query<AlbumEntity>() on l equals a.Label into g
-                      select new { l.Name, Num = g.Count() });
+                      select new { l.Name, Num = g.Count() })!;
 
             Assert.IsType<CleanMeta>(dic["Name"]);
             Assert.IsType<DirtyMeta>(dic["Num"]);
@@ -90,7 +90,7 @@ public void MetaComplexGroup()
             var dic = DynamicQueryCore.QueryMetadata(
                     from a in Database.Query<AlbumEntity>()
                     group a by a.Label into g
-                    select new { g.Key, Num = g.Count() });
+                    select new { g.Key, Num = g.Count() })!;
 
             Assert.IsType<CleanMeta>(dic["Key"]);
             Assert.IsType<DirtyMeta>(dic["Num"]);
@@ -105,7 +105,7 @@ public void MetaSelectMany()
                     from a in Database.Query<AlbumEntity>()
                     from s in a.Songs
                     select new { a.Name, Song = s.Name }
-                    );
+                    )!;
 
             Assert.IsType<CleanMeta>(dic["Name"]);
             Assert.IsType<CleanMeta>(dic["Song"]);
@@ -119,7 +119,7 @@ public void MetaCoallesce()
             var dic = DynamicQueryCore.QueryMetadata(
                     from a in Database.Query<AlbumEntity>()
                     select new { Author = (ArtistEntity)a.Author ?? (IAuthorEntity)(BandEntity)a.Author }
-                    );
+                    )!;
 
             DirtyMeta meta = (DirtyMeta)dic["Author"]!;
 
@@ -132,7 +132,7 @@ public void MetaConditional()
             var dic = DynamicQueryCore.QueryMetadata(
                     from a in Database.Query<AlbumEntity>()
                     select new { Author = a.Id > 1 ? (ArtistEntity)a.Author : (IAuthorEntity)(BandEntity)a.Author }
-                    );
+                    )!;
 
             DirtyMeta meta = (DirtyMeta)dic["Author"]!;
 
diff --git a/Signum.Test/ObjectNameTest.cs b/Signum.Test/ObjectNameTest.cs
index 28cacc0161..c102e71c29 100644
--- a/Signum.Test/ObjectNameTest.cs
+++ b/Signum.Test/ObjectNameTest.cs
@@ -1,5 +1,6 @@
 using Xunit;
 using Signum.Engine.Maps;
+using System.Globalization;
 
 namespace Signum.Test
 {
diff --git a/Signum.Utilities/NotNullAttributes.cs b/Signum.Utilities/NotNullAttributes.cs
index 038a2f56d4..91db8e26c7 100644
--- a/Signum.Utilities/NotNullAttributes.cs
+++ b/Signum.Utilities/NotNullAttributes.cs
@@ -5,6 +5,22 @@
 
 namespace System.Runtime.CompilerServices
 {
+    [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false)]
+    public class NullableAttribute : Attribute
+    {
+        public NullableAttribute(byte b) {
+            B = b;
+        }
+
+        public NullableAttribute(byte[] bs)
+        {
+            Bs = bs;
+        }
+
+        public byte? B { get; }
+        public byte[]? Bs { get; }
+    }
+
     [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false)]
     public class AssertsTrueAttribute : Attribute
     {

From e6f1fc5b7c5bc040c9412218250f681d4712d711 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Thu, 31 Jan 2019 00:04:05 +0100
Subject: [PATCH 16/25] more on not nullable (including TSGenerator)

---
 Signum.Engine/Engine/SchemaSynchronizer.cs    |  6 +-
 .../Linq/ExpressionVisitor/QueryBinder.cs     |  2 +-
 Signum.Entities/DynamicQuery/Filter.cs        |  6 +-
 Signum.Entities/DynamicQuery/QueryUtils.cs    |  4 +-
 Signum.Entities/DynamicQuery/Requests.cs      |  4 +-
 Signum.Entities/PropertyAttributes.cs         |  2 +-
 Signum.Entities/SystemTime.cs                 |  9 +-
 Signum.Entities/Validator.cs                  |  3 +
 Signum.Framework.sln                          | 61 ++++++--------
 .../ApiControllers/OperationController.cs     | 37 ++++++---
 .../ApiControllers/QueryController.cs         | 31 ++++---
 .../ApiControllers/ReflectionController.cs    |  4 +-
 .../Facades/LambdaToJavascriptConverter.cs    | 12 +--
 Signum.React/Facades/ReflectionServer.cs      | 56 +++++++------
 Signum.React/Facades/SignumServer.cs          | 20 +++--
 .../Filters/ProfilerFilterAttribute.cs        | 10 +--
 Signum.React/Filters/SignumFilters.cs         | 16 ++--
 .../JsonConverters/ArgsJsonConverter.cs       | 17 ++--
 .../JsonConverters/EntityJsonConverter.cs     | 83 +++++++++++--------
 .../JsonSerializerExtensions.cs               |  8 +-
 .../JsonConverters/LiteJsonConverter.cs       | 20 ++---
 .../JsonConverters/MListJsonConverter.cs      | 20 ++---
 .../JsonConverters/TimeSpanConverter.cs       |  6 +-
 .../JsonModelValidators/DefaultValidator.cs   | 52 ++++++------
 .../SignumObjectValidator.cs                  |  7 +-
 .../Scripts/Signum.Entities.Basics.ts         | 32 +++----
 Signum.React/Scripts/Signum.Entities.ts       |  2 +-
 Signum.React/Signum.React.csproj              |  8 +-
 .../EntityDeclarationGenerator.cs             | 19 +++--
 .../Properties/launchSettings.json            |  4 +-
 Signum.TSGenerator/Signum.TSGenerator.csproj  |  2 +-
 Signum.TSGenerator/Signum.TSGenerator.nuspec  |  2 +-
 .../Reflection/ReflectionTools.cs             |  2 +-
 Signum.Utilities/Tsv.cs                       |  2 +-
 34 files changed, 303 insertions(+), 266 deletions(-)

diff --git a/Signum.Engine/Engine/SchemaSynchronizer.cs b/Signum.Engine/Engine/SchemaSynchronizer.cs
index 4c29d91781..3cd83fcb66 100644
--- a/Signum.Engine/Engine/SchemaSynchronizer.cs
+++ b/Signum.Engine/Engine/SchemaSynchronizer.cs
@@ -449,9 +449,9 @@ private static SqlPreCommand UpdateCompatible(Replacements replacements, ITable
             return SqlPreCommand.Combine(Spacing.Simple,
                 NotNullUpdate(tab.Name, tabCol, defaultValue, goBefore),
                 SqlBuilder.AlterTableAlterColumn(tab, tabCol, difCol.DefaultConstraint?.Name),
-                history ? NotNullUpdate(tab.SystemVersioned.TableName, tabCol, defaultValue, goBefore) : null,
-                history ? SqlBuilder.AlterTableAlterColumn(tab, tabCol, difCol.DefaultConstraint?.Name, tab.SystemVersioned.TableName) : null
-            );
+                history ? NotNullUpdate(tab.SystemVersioned!.TableName, tabCol, defaultValue, goBefore) : null,
+                history ? SqlBuilder.AlterTableAlterColumn(tab, tabCol, difCol.DefaultConstraint?.Name, tab.SystemVersioned!.TableName) : null
+            )!;
         }
 
         private static SqlPreCommandSimple NotNullUpdate(ObjectName tab, IColumn tabCol, string defaultValue, bool goBefore)
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
index 9a4080d9ab..30ef635e43 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
@@ -31,7 +31,7 @@ internal class QueryBinder : ExpressionVisitor
 
         internal AliasGenerator aliasGenerator;
 
-        internal SystemTime systemTime;
+        internal SystemTime? systemTime;
 
         public QueryBinder(AliasGenerator aliasGenerator)
         {
diff --git a/Signum.Entities/DynamicQuery/Filter.cs b/Signum.Entities/DynamicQuery/Filter.cs
index 7624f28872..6f3d69488d 100644
--- a/Signum.Entities/DynamicQuery/Filter.cs
+++ b/Signum.Entities/DynamicQuery/Filter.cs
@@ -30,10 +30,10 @@ public abstract class Filter
     public class FilterGroup : Filter
     {
         public FilterGroupOperation GroupOperation { get; }
-        public QueryToken Token { get; }
+        public QueryToken? Token { get; }
         public List<Filter> Filters { get; }
 
-        public FilterGroup(FilterGroupOperation groupOperation, QueryToken token, List<Filter> filters)
+        public FilterGroup(FilterGroupOperation groupOperation, QueryToken? token, List<Filter> filters)
         {
             this.GroupOperation = groupOperation;
             this.Token = token;
@@ -91,7 +91,7 @@ public class FilterCondition : Filter
         public FilterOperation Operation { get; }
         public object? Value { get; }
 
-        public FilterCondition(QueryToken token, FilterOperation operation, object value)
+        public FilterCondition(QueryToken token, FilterOperation operation, object? value)
         {
             this.Token = token;
             this.Operation = operation;
diff --git a/Signum.Entities/DynamicQuery/QueryUtils.cs b/Signum.Entities/DynamicQuery/QueryUtils.cs
index 5bd960d680..c0ef15ae9d 100644
--- a/Signum.Entities/DynamicQuery/QueryUtils.cs
+++ b/Signum.Entities/DynamicQuery/QueryUtils.cs
@@ -217,7 +217,7 @@ public static List<FilterOperation> GetFilterOperations(FilterType filtertype)
             return null;
         }
 
-        public static List<QueryToken> SubTokens(this QueryToken token, QueryDescription qd, SubTokensOptions options)
+        public static List<QueryToken> SubTokens(this QueryToken? token, QueryDescription qd, SubTokensOptions options)
         {
             var result = SubTokensBasic(token, qd, options);
 
@@ -299,7 +299,7 @@ private static IEnumerable<QueryToken> AggregateTokens(QueryToken? token, QueryD
         }
 
         public static Func<bool> MergeEntityColumns = null;
-        static List<QueryToken> SubTokensBasic(QueryToken token, QueryDescription qd, SubTokensOptions options)
+        static List<QueryToken> SubTokensBasic(QueryToken? token, QueryDescription qd, SubTokensOptions options)
         {
             if (token == null)
             {
diff --git a/Signum.Entities/DynamicQuery/Requests.cs b/Signum.Entities/DynamicQuery/Requests.cs
index c5ac1a62f7..0e4b629390 100644
--- a/Signum.Entities/DynamicQuery/Requests.cs
+++ b/Signum.Entities/DynamicQuery/Requests.cs
@@ -194,8 +194,8 @@ public Paginate WithCurrentPage(int newPage)
     [Serializable]
     public class QueryValueRequest : BaseQueryRequest
     {
-        public QueryToken ValueToken { get; set; }
-        public SystemTime SystemTime { get; set; }
+        public QueryToken? ValueToken { get; set; }
+        public SystemTime? SystemTime { get; set; }
 
         public List<CollectionElementToken> Multiplications
         {
diff --git a/Signum.Entities/PropertyAttributes.cs b/Signum.Entities/PropertyAttributes.cs
index 36ca411d7b..fc7607cf69 100644
--- a/Signum.Entities/PropertyAttributes.cs
+++ b/Signum.Entities/PropertyAttributes.cs
@@ -29,7 +29,7 @@ public class UnitAttribute : Attribute
     {
         public static Dictionary<string, Func<string>> UnitTranslations = new Dictionary<string, Func<string>>();
 
-        public static string? GetTranslation(string unitName)
+        public static string? GetTranslation(string? unitName)
         {
             if (string.IsNullOrEmpty(unitName))
                 return null;
diff --git a/Signum.Entities/SystemTime.cs b/Signum.Entities/SystemTime.cs
index 6d6fc991b2..c7f5e49ec3 100644
--- a/Signum.Entities/SystemTime.cs
+++ b/Signum.Entities/SystemTime.cs
@@ -9,13 +9,12 @@ namespace Signum.Entities
 {
     public abstract class SystemTime
     {
-        static Variable<SystemTime> currentVariable = Statics.ThreadVariable<SystemTime>("systemTime");
-
-        public static SystemTime Current => currentVariable.Value;
-
+        static Variable<SystemTime?> currentVariable = Statics.ThreadVariable<SystemTime?>("systemTime");
 
+        public static SystemTime? Current => currentVariable.Value;
+        
         public static IDisposable Override(DateTime asOf) => Override(new SystemTime.AsOf(asOf));
-        public static IDisposable Override(SystemTime systemTime)
+        public static IDisposable Override(SystemTime? systemTime)
         {
             var old = currentVariable.Value;
             currentVariable.Value = systemTime;
diff --git a/Signum.Entities/Validator.cs b/Signum.Entities/Validator.cs
index b4745de5de..4349d01bd5 100644
--- a/Signum.Entities/Validator.cs
+++ b/Signum.Entities/Validator.cs
@@ -136,6 +136,7 @@ public interface IPropertyValidator
     {
         PropertyInfo PropertyInfo { get; }
         List<ValidatorAttribute> Validators { get; }
+        bool Required { get; }
 
         string? PropertyCheck(ModifiableEntity modifiableEntity);
         object? GetValueUntyped(ModifiableEntity entity);
@@ -156,6 +157,8 @@ public class PropertyValidator<T> : IPropertyValidator
 
         public Func<T, PropertyInfo, string>? StaticPropertyValidation { get; set; }
 
+        public bool Required => throw new NotImplementedException();
+
         internal PropertyValidator(PropertyInfo pi)
         {
             this.PropertyInfo = pi;
diff --git a/Signum.Framework.sln b/Signum.Framework.sln
index 78e912af38..262d9e42c4 100644
--- a/Signum.Framework.sln
+++ b/Signum.Framework.sln
@@ -1,53 +1,46 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 2012
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Signum.Utilities", "Signum.Utilities\Signum.Utilities.csproj", "{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}"
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.28516.95
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.Utilities", "Signum.Utilities\Signum.Utilities.csproj", "{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Signum.Entities", "Signum.Entities\Signum.Entities.csproj", "{F2B51D08-498D-4C9F-8112-9521A7762B02}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.Entities", "Signum.Entities\Signum.Entities.csproj", "{F2B51D08-498D-4C9F-8112-9521A7762B02}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Signum.Engine", "Signum.Engine\Signum.Engine.csproj", "{7F2DB6FE-C109-4057-B207-C62A767F905D}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.Engine", "Signum.Engine\Signum.Engine.csproj", "{7F2DB6FE-C109-4057-B207-C62A767F905D}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Signum.Test", "Signum.Test\Signum.Test.csproj", "{DE565EB3-EE44-469D-B6B9-C8F3CA0712EF}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.Test", "Signum.Test\Signum.Test.csproj", "{DE565EB3-EE44-469D-B6B9-C8F3CA0712EF}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Signum.TSGenerator", "Signum.TSGenerator\Signum.TSGenerator.csproj", "{32990F1A-6A78-439E-8194-68F05AA1CCB1}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.TSGenerator", "Signum.TSGenerator\Signum.TSGenerator.csproj", "{32990F1A-6A78-439E-8194-68F05AA1CCB1}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Signum.MSBuildTask", "Signum.MSBuildTask\Signum.MSBuildTask.csproj", "{5D992EC2-1F54-4B7B-AF47-CB76E340B658}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.MSBuildTask", "Signum.MSBuildTask\Signum.MSBuildTask.csproj", "{5D992EC2-1F54-4B7B-AF47-CB76E340B658}"
 EndProject
 Global
-	GlobalSection(TestCaseManagementSettings) = postSolution
-		CategoryFile = Signum.Framework.vsmdi
-	EndGlobalSection
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
 		Release|Any CPU = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}.Release|Any CPU.Build.0 = Release|Any CPU
-		{F2B51D08-498D-4C9F-8112-9521A7762B02}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{F2B51D08-498D-4C9F-8112-9521A7762B02}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{F2B51D08-498D-4C9F-8112-9521A7762B02}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{F2B51D08-498D-4C9F-8112-9521A7762B02}.Release|Any CPU.Build.0 = Release|Any CPU
-		{7F2DB6FE-C109-4057-B207-C62A767F905D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{7F2DB6FE-C109-4057-B207-C62A767F905D}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{7F2DB6FE-C109-4057-B207-C62A767F905D}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{7F2DB6FE-C109-4057-B207-C62A767F905D}.Release|Any CPU.Build.0 = Release|Any CPU
-		{DE565EB3-EE44-469D-B6B9-C8F3CA0712EF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{DE565EB3-EE44-469D-B6B9-C8F3CA0712EF}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{DE565EB3-EE44-469D-B6B9-C8F3CA0712EF}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{DE565EB3-EE44-469D-B6B9-C8F3CA0712EF}.Release|Any CPU.Build.0 = Release|Any CPU
-		{32990F1A-6A78-439E-8194-68F05AA1CCB1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{32990F1A-6A78-439E-8194-68F05AA1CCB1}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{32990F1A-6A78-439E-8194-68F05AA1CCB1}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{32990F1A-6A78-439E-8194-68F05AA1CCB1}.Release|Any CPU.Build.0 = Release|Any CPU
-		{5D992EC2-1F54-4B7B-AF47-CB76E340B658}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{5D992EC2-1F54-4B7B-AF47-CB76E340B658}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{5D992EC2-1F54-4B7B-AF47-CB76E340B658}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{5D992EC2-1F54-4B7B-AF47-CB76E340B658}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}.Debug|Any CPU.ActiveCfg = Debug|x64
+		{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}.Release|Any CPU.ActiveCfg = Release|x64
+		{F2B51D08-498D-4C9F-8112-9521A7762B02}.Debug|Any CPU.ActiveCfg = Debug|x64
+		{F2B51D08-498D-4C9F-8112-9521A7762B02}.Release|Any CPU.ActiveCfg = Release|x64
+		{7F2DB6FE-C109-4057-B207-C62A767F905D}.Debug|Any CPU.ActiveCfg = Debug|x64
+		{7F2DB6FE-C109-4057-B207-C62A767F905D}.Release|Any CPU.ActiveCfg = Release|x64
+		{DE565EB3-EE44-469D-B6B9-C8F3CA0712EF}.Debug|Any CPU.ActiveCfg = Debug|x64
+		{DE565EB3-EE44-469D-B6B9-C8F3CA0712EF}.Release|Any CPU.ActiveCfg = Release|x64
+		{32990F1A-6A78-439E-8194-68F05AA1CCB1}.Debug|Any CPU.ActiveCfg = Debug|x64
+		{32990F1A-6A78-439E-8194-68F05AA1CCB1}.Release|Any CPU.ActiveCfg = Release|x64
+		{5D992EC2-1F54-4B7B-AF47-CB76E340B658}.Debug|Any CPU.ActiveCfg = Debug|x64
+		{5D992EC2-1F54-4B7B-AF47-CB76E340B658}.Release|Any CPU.ActiveCfg = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {43C7947A-C55C-455D-AB21-DD8E9242E72F}
+	EndGlobalSection
+	GlobalSection(TestCaseManagementSettings) = postSolution
+		CategoryFile = Signum.Framework.vsmdi
+	EndGlobalSection
 EndGlobal
diff --git a/Signum.React/ApiControllers/OperationController.cs b/Signum.React/ApiControllers/OperationController.cs
index 6dbafb2245..d565443e17 100644
--- a/Signum.React/ApiControllers/OperationController.cs
+++ b/Signum.React/ApiControllers/OperationController.cs
@@ -20,7 +20,7 @@ namespace Signum.React.ApiControllers
     public class OperationController : Controller
     {
         [HttpPost("api/operation/construct"), ValidateModelFilter, ProfilerActionSplitter]
-        public EntityPackTS Construct([Required, FromBody]ConstructOperationRequest request)
+        public EntityPackTS? Construct([Required, FromBody]ConstructOperationRequest request)
         {
             var entityType = TypeLogic.GetType(request.type);
 
@@ -30,7 +30,7 @@ public EntityPackTS Construct([Required, FromBody]ConstructOperationRequest requ
         }
 
         [HttpPost("api/operation/constructFromEntity"), ProfilerActionSplitter]
-        public EntityPackTS ConstructFromEntity([Required, FromBody]EntityOperationRequest request)
+        public EntityPackTS? ConstructFromEntity([Required, FromBody]EntityOperationRequest request)
         {
             var entity = OperationLogic.ServiceConstructFrom(request.entity, request.GetOperationSymbol(request.entity.GetType()), request.args);
 
@@ -38,7 +38,7 @@ public EntityPackTS ConstructFromEntity([Required, FromBody]EntityOperationReque
         }
 
         [HttpPost("api/operation/constructFromLite"), ProfilerActionSplitter]
-        public EntityPackTS ConstructFromLite([Required, FromBody]LiteOperationRequest request)
+        public EntityPackTS? ConstructFromLite([Required, FromBody]LiteOperationRequest request)
         {
             var entity = OperationLogic.ServiceConstructFromLite(request.lite, request.GetOperationSymbol(request.lite.EntityType), request.args);
             return entity == null ? null: SignumServer.GetEntityPack(entity);
@@ -87,11 +87,11 @@ public void DeleteLite([Required, FromBody]LiteOperationRequest request)
         }
 
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
         [JsonConverter(typeof(ArgsJsonConverter))]
         public class ConstructOperationRequest : BaseOperationRequest
         {
             public string type { get; set; }
-
         }
 
 
@@ -113,11 +113,11 @@ public class BaseOperationRequest
         {
             public string operationKey { get; set; }
 
-            public object[] args { get; set; }
+            public object[]? args { get; set; }
 
             public OperationSymbol GetOperationSymbol(Type entityType) => ParseOperationAssert(this.operationKey, entityType, this.args);
 
-            public static OperationSymbol ParseOperationAssert(string operationKey, Type entityType, object[] args = null)
+            public static OperationSymbol ParseOperationAssert(string operationKey, Type entityType, object[]? args = null)
             {
                 var symbol = SymbolLogic<OperationSymbol>.ToSymbol(operationKey);
 
@@ -128,6 +128,7 @@ public static OperationSymbol ParseOperationAssert(string operationKey, Type ent
 
             public override string ToString() => operationKey;
         }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         [HttpPost("api/operation/constructFromMany"), ProfilerActionSplitter]
         public EntityPackTS ConstructFromMany([Required, FromBody]MultiOperationRequest request)
@@ -145,7 +146,7 @@ public MultiOperationResponse ConstructFromMultiple([Required, FromBody]MultiOpe
             var errors = ForeachMultiple(request.lites, lite =>
                 OperationLogic.ServiceConstructFromLite(lite, request.GetOperationSymbol(lite.EntityType), request.args));
 
-            return new MultiOperationResponse { errors = errors };
+            return new MultiOperationResponse(errors);
         }
 
 
@@ -155,7 +156,7 @@ public MultiOperationResponse ExecuteMultiple([Required, FromBody]MultiOperation
             var errors = ForeachMultiple(request.lites, lite =>
                         OperationLogic.ServiceExecuteLite(lite, request.GetOperationSymbol(lite.EntityType), request.args));
 
-            return new MultiOperationResponse { errors = errors };
+            return new MultiOperationResponse(errors);
         }
 
         [HttpPost("api/operation/deleteMultiple"), ProfilerActionSplitter]
@@ -164,7 +165,7 @@ public MultiOperationResponse DeleteMultiple([Required, FromBody]MultiOperationR
             var errors = ForeachMultiple(request.lites, lite =>
                     OperationLogic.ServiceDelete(lite, request.GetOperationSymbol(lite.EntityType), request.args));
 
-            return new MultiOperationResponse { errors = errors };
+            return new MultiOperationResponse(errors);
         }
 
         static Dictionary<string, string> ForeachMultiple(IEnumerable<Lite<Entity>> lites, Action<Lite<Entity>> action)
@@ -188,15 +189,22 @@ static Dictionary<string, string> ForeachMultiple(IEnumerable<Lite<Entity>> lite
         }
 
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
         [JsonConverter(typeof(ArgsJsonConverter))]
         public class MultiOperationRequest : BaseOperationRequest
         {
             public string type { get; set; }
             public Lite<Entity>[] lites { get; set; }
         }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         public class MultiOperationResponse
         {
+            public MultiOperationResponse(Dictionary<string, string> errors)
+            {
+                this.errors = errors;
+            }
+
             public Dictionary<string, string> errors { get; set; }
         }
 
@@ -209,19 +217,26 @@ public StateCanExecuteResponse StateCanExecutes([Required, FromBody]StateCanExec
                 .Select(operationKey => types.Select(t => BaseOperationRequest.ParseOperationAssert(operationKey, t)).Distinct().SingleEx())
                 .ToList();
 
-            var result = OperationLogic.GetContextualCanExecute(request.lites, operationSymbols);
+            var result = OperationLogic.GetContextualCanExecute(request.lites, operationSymbols)!;
 
-            return new StateCanExecuteResponse { canExecutes = result.SelectDictionary(a => a.Key, v => v) };
+            return new StateCanExecuteResponse(result.SelectDictionary(a => a.Key, v => v));
         }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
         public class StateCanExecuteRequest
         {
             public string[] operationKeys { get; set; }
             public Lite<Entity>[] lites { get; set; }
         }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         public class StateCanExecuteResponse
         {
+            public StateCanExecuteResponse(Dictionary<string, string> canExecutes)
+            {
+                this.canExecutes = canExecutes;
+            }
+
             public Dictionary<string, string> canExecutes { get; set; }
         }
 
diff --git a/Signum.React/ApiControllers/QueryController.cs b/Signum.React/ApiControllers/QueryController.cs
index 058bc0edbb..53bced9496 100644
--- a/Signum.React/ApiControllers/QueryController.cs
+++ b/Signum.React/ApiControllers/QueryController.cs
@@ -23,6 +23,8 @@
 
 namespace Signum.React.ApiControllers
 {
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
+
     [ValidateModelFilter]
     public class QueryController : ControllerBase
     {
@@ -111,7 +113,6 @@ public class ParseTokensRequest
         {
             public string queryKey;
             public List<TokenRequest> tokens;
-
         }
 
         [HttpPost("api/query/subTokens")]
@@ -131,7 +132,7 @@ public List<QueryTokenTS> SubTokens([Required, FromBody]SubTokensRequest request
         public class SubTokensRequest
         {
             public string queryKey;
-            public string token;
+            public string? token;
             public SubTokensOptions options;
         }
 
@@ -149,7 +150,7 @@ public async Task<List<Lite<Entity>>> GetEntitiesWithFilter([Required, FromBody]
         }
 
         [HttpPost("api/query/queryValue"), ProfilerActionSplitter]
-        public async Task<object> QueryValue([Required, FromBody]QueryValueRequestTS request, CancellationToken token)
+        public async Task<object?> QueryValue([Required, FromBody]QueryValueRequestTS request, CancellationToken token)
         {
             return await QueryLogic.Queries.ExecuteQueryValueAsync(request.ToQueryCountRequest(), token);
         }
@@ -277,7 +278,7 @@ public static FilterTS FromFilter(Filter filter)
             if (filter is FilterGroup fg)
                 return new FilterGroupTS
                 {
-                    token = fg.Token.FullKey(),
+                    token = fg.Token?.FullKey(),
                     groupOperation = fg.GroupOperation,
                     filters = fg.Filters.Select(f => FromFilter(f)).ToList(),
                 };
@@ -290,16 +291,14 @@ public class FilterConditionTS : FilterTS
     {
         public string token;
         public FilterOperation operation;
-        public object value;
+        public object? value;
 
         public override Filter ToFilter(QueryDescription qd, bool canAggregate)
         {
             var options = SubTokensOptions.CanElement | SubTokensOptions.CanAnyAll | (canAggregate ? SubTokensOptions.CanAggregate : 0);
             var parsedToken = QueryUtils.Parse(token, qd, options);
             var expectedValueType = operation.IsList() ? typeof(ObservableCollection<>).MakeGenericType(parsedToken.Type.Nullify()) : parsedToken.Type;
-
-
-
+            
             var val = value is JToken ?
                  ((JToken)value).ToObject(expectedValueType, JsonSerializer.Create(SignumServer.JsonSerializerSettings)) :
                  value;
@@ -313,7 +312,7 @@ public override Filter ToFilter(QueryDescription qd, bool canAggregate)
     public class FilterGroupTS : FilterTS
     {
         public FilterGroupOperation groupOperation;
-        public string token;
+        public string? token;
         public List<FilterTS> filters;
 
         public override Filter ToFilter(QueryDescription qd, bool canAggregate)
@@ -461,15 +460,15 @@ public class ColumnDescriptionTS
         public string typeColor;
         public string niceTypeName;
         public FilterType? filterType;
-        public string unit;
-        public string format;
+        public string? unit;
+        public string? format;
         public string displayName;
         public bool isGroupable;
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)]
         public bool hasOrderAdapter;
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)]
         public bool preferEquals;
-        public string propertyRoute;
+        public string? propertyRoute;
 
         public ColumnDescriptionTS(ColumnDescription a, object queryName)
         {
@@ -545,15 +544,15 @@ public QueryTokenTS(QueryToken qt, bool recursive)
         public QueryTokenType? queryTokenType;
         public TypeReferenceTS type;
         public FilterType? filterType;
-        public string format;
-        public string unit;
+        public string? format;
+        public string? unit;
         public bool isGroupable;
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)]
         public bool hasOrderAdapter;
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)]
         public bool preferEquals;
-        public QueryTokenTS parent;
-        public string propertyRoute;
+        public QueryTokenTS? parent;
+        public string? propertyRoute;
     }
 
     public enum QueryTokenType
diff --git a/Signum.React/ApiControllers/ReflectionController.cs b/Signum.React/ApiControllers/ReflectionController.cs
index 0c78365347..06284d57c7 100644
--- a/Signum.React/ApiControllers/ReflectionController.cs
+++ b/Signum.React/ApiControllers/ReflectionController.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using Signum.React.Facades;
 using Signum.Entities.Basics;
 using Signum.Engine.Basics;
@@ -16,7 +16,7 @@ public Dictionary<string, TypeInfoTS> Types()
         }
 
         [HttpGet("api/reflection/typeEntity/{typeName}")]
-        public TypeEntity GetTypeEntity(string typeName)
+        public TypeEntity? GetTypeEntity(string typeName)
         {
             return TypeLogic.TryGetType(typeName)?.ToTypeEntity();
         }
diff --git a/Signum.React/Facades/LambdaToJavascriptConverter.cs b/Signum.React/Facades/LambdaToJavascriptConverter.cs
index 092fae82e8..5703cdaf0c 100644
--- a/Signum.React/Facades/LambdaToJavascriptConverter.cs
+++ b/Signum.React/Facades/LambdaToJavascriptConverter.cs
@@ -1,4 +1,4 @@
-using Signum.Entities;
+using Signum.Entities;
 using Signum.Entities.Reflection;
 using Signum.Utilities;
 using Signum.Utilities.ExpressionTrees;
@@ -12,7 +12,7 @@ namespace Signum.React.Facades
 {
     internal class LambdaToJavascriptConverter
     {
-        public static string ToJavascript(LambdaExpression lambdaExpression)
+        public static string? ToJavascript(LambdaExpression lambdaExpression)
         {
             if (lambdaExpression == null)
                 return null;
@@ -32,7 +32,7 @@ public static string ToJavascript(LambdaExpression lambdaExpression)
             { "\r", ""},
         };
 
-        private static string ToJavascript(ParameterExpression param, Expression expr)
+        private static string? ToJavascript(ParameterExpression param, Expression expr)
         {
             if (param == expr)
                 return "e";
@@ -126,7 +126,7 @@ private static string ToJavascript(ParameterExpression param, Expression expr)
             return null;
         }
 
-        private static string ToJavascriptToString(ParameterExpression param, Expression expr, string format = null)
+        private static string? ToJavascriptToString(ParameterExpression param, Expression expr, string? format = null)
         {
             var r = ToJavascript(param, expr);
 
@@ -139,7 +139,7 @@ private static string ToJavascriptToString(ParameterExpression param, Expression
             if (expr.Type.IsModifiableEntity() || expr.Type.IsLite() || expr.Type.IsIEntity())
                 return "getToString(" + r + ")";
 
-            string formatFull = format == null ? null : (", '" + format + "'");
+            string? formatFull = format == null ? null : (", '" + format + "'");
 
             if (expr.Type.UnNullify() == typeof(DateTime))
                 return "dateToString(" + r + formatFull + ")";
@@ -153,4 +153,4 @@ private static string ToJavascriptToString(ParameterExpression param, Expression
             return "valToString(" + r + ")";
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.React/Facades/ReflectionServer.cs b/Signum.React/Facades/ReflectionServer.cs
index 82bb905432..85316d5a3d 100644
--- a/Signum.React/Facades/ReflectionServer.cs
+++ b/Signum.React/Facades/ReflectionServer.cs
@@ -181,18 +181,19 @@ select KVP.Create(GetTypeName(type), OnAddTypeExtension(new TypeInfoTS
                               EntityData = type.IsIEntity() ? EntityKindCache.GetEntityData(type) : (EntityData?)null,
                               IsLowPopulation = type.IsIEntity() ? EntityKindCache.IsLowPopulation(type) : false,
                               IsSystemVersioned = type.IsIEntity() ? schema.Table(type).SystemVersioned != null : false,
-                              ToStringFunction = typeof(Symbol).IsAssignableFrom(type) ? null : LambdaToJavascriptConverter.ToJavascript(ExpressionCleaner.GetFieldExpansion(type, miToString)),
+                              ToStringFunction = typeof(Symbol).IsAssignableFrom(type) ? null : LambdaToJavascriptConverter.ToJavascript(ExpressionCleaner.GetFieldExpansion(type, miToString)!),
                               QueryDefined = queries.QueryDefined(type),
-                              Members = PropertyRoute.GenerateRoutes(type).Where(pr => InTypeScript(pr))
+                              Members = PropertyRoute.GenerateRoutes(type)
+                                .Where(pr => InTypeScript(pr))
                                 .ToDictionary(p => p.PropertyString(), p =>
                                 {
                                     var mi = new MemberInfoTS
                                     {
-                                        NiceName = p.PropertyInfo?.NiceName(),
-                                        TypeNiceName = GetTypeNiceName(p.PropertyInfo?.PropertyType),
+                                        NiceName = p.PropertyInfo!.NiceName(),
+                                        TypeNiceName = GetTypeNiceName(p.PropertyInfo!.PropertyType),
                                         Format = p.PropertyRouteType == PropertyRouteType.FieldOrProperty ? Reflector.FormatString(p) : null,
                                         IsReadOnly = !IsId(p) && (p.PropertyInfo?.IsReadOnly() ?? false),
-                                        Required = !IsId(p) && ((p.Type.IsValueType && !p.Type.IsNullable()) || Validator.TryGetPropertyValidator(p).Validators.Any(v => !v.DisabledInModelBinder && (v is NotNullValidatorAttribute || v is StringLengthValidatorAttribute s && s.AllowNulls == false))),
+                                        Required = !IsId(p) && ((p.Type.IsValueType && !p.Type.IsNullable()) || Validator.TryGetPropertyValidator(p)!.Validators.Any(v => (v is NotNullValidatorAttribute) && !v.DisabledInModelBinder)),
                                         Unit = UnitAttribute.GetTranslation(p.PropertyInfo?.GetCustomAttribute<UnitAttribute>()?.UnitName),
                                         Type = new TypeReferenceTS(IsId(p) ? PrimaryKey.Type(type).Nullify() : p.PropertyInfo?.PropertyType, p.Type.IsMList() ? p.Add("Item").TryGetImplementations() : p.TryGetImplementations()),
                                         IsMultiline = Validator.TryGetPropertyValidator(p)?.Validators.OfType<StringLengthValidatorAttribute>().FirstOrDefault()?.MultiLine ?? false,
@@ -214,7 +215,8 @@ select KVP.Create(GetTypeName(type), OnAddTypeExtension(new TypeInfoTS
 
         public static bool InTypeScript(PropertyRoute pr)
         {
-            return (pr.Parent == null || InTypeScript(pr.Parent)) && (pr.PropertyInfo == null || (pr.PropertyInfo.GetCustomAttribute<InTypeScriptAttribute>()?.GetInTypeScript() ?? !IsExpression(pr.Parent.Type, pr.PropertyInfo)));
+            return (pr.Parent == null || InTypeScript(pr.Parent)) && 
+                (pr.PropertyInfo == null || (pr.PropertyInfo.GetCustomAttribute<InTypeScriptAttribute>()?.GetInTypeScript() ?? !IsExpression(pr.Parent!.Type, pr.PropertyInfo)));
         }
 
         private static bool IsExpression(Type type, PropertyInfo propertyInfo)
@@ -222,7 +224,7 @@ private static bool IsExpression(Type type, PropertyInfo propertyInfo)
             return propertyInfo.SetMethod == null && ExpressionCleaner.HasExpansions(type, propertyInfo);
         }
 
-        static string GetTypeNiceName(Type type)
+        static string? GetTypeNiceName(Type type)
         {
             if (type.IsModifiableEntity() && !type.IsEntity())
                 return type.NiceName();
@@ -232,8 +234,8 @@ static string GetTypeNiceName(Type type)
         public static bool IsId(PropertyRoute p)
         {
             return p.PropertyRouteType == PropertyRouteType.FieldOrProperty &&
-                p.PropertyInfo.Name == nameof(Entity.Id) &&
-                p.Parent.PropertyRouteType == PropertyRouteType.Root;
+                p.PropertyInfo!.Name == nameof(Entity.Id) &&
+                p.Parent!.PropertyRouteType == PropertyRouteType.Root;
         }
 
         public static Dictionary<string, TypeInfoTS> GetEnums(IEnumerable<Type> allTypes)
@@ -300,7 +302,7 @@ private static (FieldInfo FieldInfo, PrimaryKey? IdOrNull) GetSymbolInfo(FieldIn
                 return (s.FieldInfo, s.IdOrNull);
 
             if(v is SemiSymbol semiS)
-                return (semiS.FieldInfo, semiS.IdOrNull);
+                return (semiS.FieldInfo!, semiS.IdOrNull);
 
             throw new InvalidOperationException();
         }
@@ -320,13 +322,13 @@ public class TypeInfoTS
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "kind")]
         public KindOfType Kind { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "fullName")]
-        public string FullName { get; set; }
+        public string FullName { get; set; } = null!;
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "niceName")]
-        public string NiceName { get; set; }
+        public string? NiceName { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "nicePluralName")]
-        public string NicePluralName { get; set; }
+        public string? NicePluralName { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "gender")]
-        public string Gender { get; set; }
+        public string? Gender { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "entityKind")]
         public EntityKind? EntityKind { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "entityData")]
@@ -336,13 +338,13 @@ public class TypeInfoTS
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore, PropertyName = "isSystemVersioned")]
         public bool IsSystemVersioned { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "toStringFunction")]
-        public string ToStringFunction { get; set; }
+        public string? ToStringFunction { get; set; }
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore, PropertyName = "queryDefined")]
         public bool QueryDefined { get; internal set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "members")]
-        public Dictionary<string, MemberInfoTS> Members { get; set; }
+        public Dictionary<string, MemberInfoTS> Members { get; set; } = null!;
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "operations")]
-        public Dictionary<string, OperationInfoTS> Operations { get; set; }
+        public Dictionary<string, OperationInfoTS>? Operations { get; set; }
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore, PropertyName = "requiresEntityPack")]
         public bool RequiresEntityPack { get; set; }
 
@@ -356,19 +358,19 @@ public class TypeInfoTS
     public class MemberInfoTS
     {
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "type")]
-        public TypeReferenceTS Type { get; set; }
+        public TypeReferenceTS? Type { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "niceName")]
-        public string NiceName { get; set; }
+        public string? NiceName { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "typeNiceName")]
-        public string TypeNiceName { get; set; }
+        public string? TypeNiceName { get; set; }
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore, PropertyName = "isReadOnly")]
         public bool IsReadOnly { get; set; }
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore, PropertyName = "required")]
         public bool Required { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "unit")]
-        public string Unit { get; set; }
+        public string? Unit { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "format")]
-        public string Format { get; set; }
+        public string? Format { get; set; }
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore, PropertyName = "isIgnoredEnum")]
         public bool IsIgnoredEnum { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "maxLength")]
@@ -379,7 +381,7 @@ public class MemberInfoTS
         public bool PreserveOrder { get; internal set; }
 
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "id")]
-        public object Id { get; set; }
+        public object? Id { get; set; }
 
         [JsonExtensionData]
         public Dictionary<string, object> Extension { get; set; } = new Dictionary<string, object>();
@@ -424,9 +426,11 @@ public class TypeReferenceTS
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "name")]
         public string Name { get; set; }
         [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "typeNiceName")]
-        public string TypeNiceName { get; set; }
+        public string? TypeNiceName { get; set; }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
         public TypeReferenceTS() { }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
         public TypeReferenceTS(Type type, Implementations? implementations)
         {
             this.IsCollection = type != typeof(string) && type != typeof(byte[]) && type.ElementType() != null;
@@ -454,11 +458,11 @@ private static string TypeScriptType(Type type)
         private static Type CleanMList(Type type)
         {
             if (type.IsMList())
-                type = type.ElementType();
+                type = type.ElementType()!;
             return type;
         }
 
-        public static string BasicType(Type type)
+        public static string? BasicType(Type type)
         {
             if (type.IsEnum)
                 return null;
diff --git a/Signum.React/Facades/SignumServer.cs b/Signum.React/Facades/SignumServer.cs
index 2e6a587dfd..060354d6eb 100644
--- a/Signum.React/Facades/SignumServer.cs
+++ b/Signum.React/Facades/SignumServer.cs
@@ -1,4 +1,4 @@
-using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Mvc;
 using Newtonsoft.Json;
@@ -79,11 +79,9 @@ public static EntityPackTS GetEntityPack(Entity entity)
         {
             var canExecutes = OperationLogic.ServiceCanExecute(entity);
 
-            var result = new EntityPackTS
-            {
-                entity = entity,
-                canExecute = canExecutes.ToDictionary(a => a.Key.Key, a => a.Value)
-            };
+            var result = new EntityPackTS(entity,
+                canExecutes.ToDictionary(a => a.Key.Key, a => a.Value)
+            );
 
             foreach (var action in EntityPackTS.AddExtension.GetInvocationListTyped())
             {
@@ -100,8 +98,14 @@ public class EntityPackTS
         public Dictionary<string, string> canExecute { get; set; }
 
         [JsonExtensionData]
-        public Dictionary<string, object> Extension { get; set; } = new Dictionary<string, object>();
+        public Dictionary<string, object> extension { get; set; } = new Dictionary<string, object>();
 
         public static Action<EntityPackTS> AddExtension;
+
+        public EntityPackTS(Entity entity, Dictionary<string, string> canExecute)
+        {
+            this.entity = entity;
+            this.canExecute = canExecute;
+        }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.React/Filters/ProfilerFilterAttribute.cs b/Signum.React/Filters/ProfilerFilterAttribute.cs
index 868b43f541..a29363f986 100644
--- a/Signum.React/Filters/ProfilerFilterAttribute.cs
+++ b/Signum.React/Filters/ProfilerFilterAttribute.cs
@@ -1,4 +1,4 @@
-using Microsoft.AspNetCore.Mvc.Controllers;
+using Microsoft.AspNetCore.Mvc.Controllers;
 using Microsoft.AspNetCore.Mvc.Filters;
 using Signum.Utilities;
 using Signum.Utilities.ExpressionTrees;
@@ -10,14 +10,14 @@ namespace Signum.React.Filters
     [AttributeUsage(AttributeTargets.Method, Inherited = false, AllowMultiple = true)]
     public class ProfilerActionSplitterAttribute : Attribute
     {
-        readonly string requestKey;
+        readonly string? requestKey;
 
-        public ProfilerActionSplitterAttribute(string requestKey = null)
+        public ProfilerActionSplitterAttribute(string? requestKey = null)
         {
             this.requestKey = requestKey;
         }
 
-        public string RequestKey
+        public string? RequestKey
         {
             get { return requestKey; }
         }
@@ -43,4 +43,4 @@ public static string GetActionDescription(FilterContext actionContext)
             return action;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.React/Filters/SignumFilters.cs b/Signum.React/Filters/SignumFilters.cs
index 299eb666ba..5225dfd50d 100644
--- a/Signum.React/Filters/SignumFilters.cs
+++ b/Signum.React/Filters/SignumFilters.cs
@@ -1,4 +1,4 @@
-using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Extensions;
 using Microsoft.AspNetCore.Mvc.Filters;
 using Signum.Entities.Basics;
@@ -11,7 +11,7 @@ namespace Signum.React.Filters
 {
     public class SignumAuthenticationResult
     {
-        public IUserEntity User { get; set; }
+        public IUserEntity? User { get; set; }
     }
 
     public class SignumEnableBufferingFilter : IResourceFilter
@@ -45,7 +45,7 @@ public SignumAuthenticationFilter() : base("Signum_User"){ }
 
         public static readonly IList<Func<FilterContext, SignumAuthenticationResult>> Authenticators = new List<Func<FilterContext, SignumAuthenticationResult>>();
 
-        private static SignumAuthenticationResult Authenticate(ResourceExecutingContext actionContext)
+        private static SignumAuthenticationResult? Authenticate(ResourceExecutingContext actionContext)
         {
             foreach (var item in Authenticators)
             {
@@ -57,7 +57,7 @@ private static SignumAuthenticationResult Authenticate(ResourceExecutingContext
             return null;
         }
 
-        public override IDisposable GetResource(ResourceExecutingContext context)
+        public override IDisposable? GetResource(ResourceExecutingContext context)
         {
             var result = Authenticate(context);
 
@@ -98,7 +98,7 @@ public class SignumTimesTrackerFilter : SignumDisposableResourceFilter
     {
         public SignumTimesTrackerFilter() : base("Signum_TimesTracker") {  }
 
-        public override IDisposable GetResource(ResourceExecutingContext context)
+        public override IDisposable? GetResource(ResourceExecutingContext context)
         {
             string action = ProfilerActionSplitterAttribute.GetActionDescription(context);
             return TimeTracker.Start(action);
@@ -109,7 +109,7 @@ public class SignumHeavyProfilerFilter : SignumDisposableResourceFilter
     {
         public SignumHeavyProfilerFilter() : base("Signum_HeavyProfiler") { }
 
-        public override IDisposable GetResource(ResourceExecutingContext context)
+        public override IDisposable? GetResource(ResourceExecutingContext context)
         {
             return HeavyProfiler.Log("Web.API " + context.HttpContext.Request.Method, () => context.HttpContext.Request.GetDisplayUrl());
         }
@@ -124,7 +124,7 @@ public SignumDisposableResourceFilter(string key)
             this.ResourceKey = key;
         }
 
-        public abstract IDisposable GetResource(ResourceExecutingContext context);
+        public abstract IDisposable? GetResource(ResourceExecutingContext context);
 
         public void OnResourceExecuting(ResourceExecutingContext context)
         {
@@ -140,4 +140,4 @@ public void OnResourceExecuted(ResourceExecutedContext context)
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.React/JsonConverters/ArgsJsonConverter.cs b/Signum.React/JsonConverters/ArgsJsonConverter.cs
index c7a7ea609d..49e78d5482 100644
--- a/Signum.React/JsonConverters/ArgsJsonConverter.cs
+++ b/Signum.React/JsonConverters/ArgsJsonConverter.cs
@@ -1,4 +1,4 @@
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using Signum.Engine;
 using Signum.Entities;
@@ -12,14 +12,13 @@ namespace Signum.React.Json
 {
     public class ArgsJsonConverter : JsonConverter
     {
-        public static Dictionary<OperationSymbol, Func<JToken, object>> CustomOperationArgsConverters =
-            new Dictionary<OperationSymbol, Func<JToken, object>>();
+        public static Dictionary<OperationSymbol, Func<JToken, object?>> CustomOperationArgsConverters = new Dictionary<OperationSymbol, Func<JToken, object?>>();
 
-        public static void RegisterCustomOperationArgsConverter(OperationSymbol operationSymbol, Func<JToken, object> converter)
+        public static void RegisterCustomOperationArgsConverter(OperationSymbol operationSymbol, Func<JToken, object?> converter)
         {
-            CustomOperationArgsConverters[operationSymbol] =
-                CustomOperationArgsConverters.TryGetC(operationSymbol) +
-                converter;
+            Func<JToken, object?>? a = CustomOperationArgsConverters.TryGetC(operationSymbol); /*CSBUG*/
+
+            CustomOperationArgsConverters[operationSymbol] = a + converter;
         }
 
         public override bool CanConvert(Type objectType)
@@ -50,7 +49,7 @@ public override object ReadJson(JsonReader reader, Type objectType, object exist
         private object ConvertObject(JToken token, JsonSerializer serializer, OperationSymbol operationSymbol)
         {
             if (token == null)
-                return null;
+                return null!;
 
             if (token is JValue)
             {
@@ -81,4 +80,4 @@ private object ConvertObject(JToken token, JsonSerializer serializer, OperationS
             return conv.GetInvocationListTyped().Select(f => conv(token)).NotNull().FirstOrDefault();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.React/JsonConverters/EntityJsonConverter.cs b/Signum.React/JsonConverters/EntityJsonConverter.cs
index 6da6c32495..1497364526 100644
--- a/Signum.React/JsonConverters/EntityJsonConverter.cs
+++ b/Signum.React/JsonConverters/EntityJsonConverter.cs
@@ -1,4 +1,4 @@
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 using Signum.Engine;
 using Signum.Engine.Basics;
 using Signum.Engine.Maps;
@@ -27,7 +27,7 @@ public static Dictionary<string, PropertyConverter> GetPropertyConverters(Type t
                 Validator.GetPropertyValidators(_t).Values
                 .Where(pv => ShouldSerialize(pv.PropertyInfo))
                 .Select(pv => new PropertyConverter(_t, pv))
-                .ToDictionary(a => a.PropertyValidator.PropertyInfo.Name.FirstLower())
+                .ToDictionary(a => a.PropertyValidator!.PropertyInfo.Name.FirstLower())
             );
         }
 
@@ -47,13 +47,13 @@ static bool ShouldSerialize(PropertyInfo pi)
             return true;
         }
 
-        public readonly IPropertyValidator PropertyValidator;
-        public readonly Func<object, object> GetValue;
-        public readonly Action<object, object> SetValue;
+        public readonly IPropertyValidator? PropertyValidator;
+        public readonly Func<object, object?>? GetValue;
+        public readonly Action<object, object?>? SetValue;
 
 
-        public Action<ReadJsonPropertyContext> CustomReadJsonProperty { get; set; }
-        public Action<WriteJsonPropertyContext> CustomWriteJsonProperty { get; set; }
+        public Action<ReadJsonPropertyContext>? CustomReadJsonProperty { get; set; }
+        public Action<WriteJsonPropertyContext>? CustomWriteJsonProperty { get; set; }
 
         public bool AvoidValidate { get; set; }
 
@@ -70,12 +70,12 @@ public PropertyConverter(Type type, IPropertyValidator pv)
 
         public override string ToString()
         {
-            return this.PropertyValidator?.PropertyInfo.Name;
+            return this.PropertyValidator?.PropertyInfo.Name ?? "";
         }
 
         internal bool IsNotNull()
         {
-            var pi = this.PropertyValidator.PropertyInfo;
+            var pi = this.PropertyValidator!.PropertyInfo;
 
             return pi.PropertyType.IsValueType && !pi.PropertyType.IsNullable();
         }
@@ -83,6 +83,15 @@ internal bool IsNotNull()
 
     public class ReadJsonPropertyContext
     {
+        public ReadJsonPropertyContext(JsonReader jsonReader, JsonSerializer jsonSerializer, PropertyConverter propertyConverter, ModifiableEntity entity, PropertyRoute parentPropertyRoute)
+        {
+            JsonReader = jsonReader;
+            JsonSerializer = jsonSerializer;
+            PropertyConverter = propertyConverter;
+            Entity = entity;
+            ParentPropertyRoute = parentPropertyRoute;
+        }
+
         public JsonReader JsonReader { get; internal set; }
         public JsonSerializer JsonSerializer { get; internal set; }
 
@@ -93,6 +102,16 @@ public class ReadJsonPropertyContext
 
     public class WriteJsonPropertyContext
     {
+        public WriteJsonPropertyContext(ModifiableEntity entity, string lowerCaseName, PropertyConverter propertyConverter, PropertyRoute parentPropertyRoute, JsonWriter jsonWriter, JsonSerializer jsonSerializer)
+        {
+            Entity = entity;
+            LowerCaseName = lowerCaseName;
+            PropertyConverter = propertyConverter;
+            ParentPropertyRoute = parentPropertyRoute;
+            JsonWriter = jsonWriter;
+            JsonSerializer = jsonSerializer;
+        }
+
         public ModifiableEntity Entity { get; internal set; }
         public string LowerCaseName { get; internal set; }
         public PropertyConverter PropertyConverter { get; internal set; }
@@ -208,19 +227,18 @@ public void WriteJsonProperty(JsonWriter writer, JsonSerializer serializer, Modi
         {
             if (pc.CustomWriteJsonProperty != null)
             {
-                pc.CustomWriteJsonProperty(new WriteJsonPropertyContext
-                {
-                    JsonWriter = writer,
-                    JsonSerializer = serializer,
-                    LowerCaseName = lowerCaseName,
-                    Entity = mod,
-                    ParentPropertyRoute = route,
-                    PropertyConverter = pc
-                });
+                pc.CustomWriteJsonProperty(new WriteJsonPropertyContext(
+                    entity : mod,
+                    lowerCaseName : lowerCaseName,
+                    propertyConverter : pc,
+                    parentPropertyRoute : route,
+                    jsonWriter : writer,
+                    jsonSerializer  : serializer
+                ));
             }
             else
             {
-                var pr = route.Add(pc.PropertyValidator.PropertyInfo);
+                var pr = route.Add(pc.PropertyValidator!.PropertyInfo);
 
                 string error = CanReadPropertyRoute?.Invoke(pr);
 
@@ -230,7 +248,7 @@ public void WriteJsonProperty(JsonWriter writer, JsonSerializer serializer, Modi
                 using (JsonSerializerExtensions.SetCurrentPropertyRoute(pr))
                 {
                     writer.WritePropertyName(lowerCaseName);
-                    serializer.Serialize(writer, pc.GetValue(mod));
+                    serializer.Serialize(writer, pc.GetValue!(mod)!);
                     if (writer.WriteState == WriteState.Property)
                         throw new InvalidOperationException($"Impossible to serialize '{mod}' to JSON. Maybe there is a cycle?");
                 }
@@ -245,7 +263,7 @@ static EntityJsonConverter()
             AfterDeserilization.Register((ModifiableEntity e) => { });
         }
 
-        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        public override object? ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
         {
             using (HeavyProfiler.LogNoStackTrace("ReadJson", () => objectType.Name))
             {
@@ -310,21 +328,20 @@ public void ReadJsonProperty(JsonReader reader, JsonSerializer serializer, Modif
         {
             if (pc.CustomReadJsonProperty != null)
             {
-                pc.CustomReadJsonProperty(new ReadJsonPropertyContext
-                {
-                    JsonReader = reader,
-                    JsonSerializer = serializer,
-                    Entity = entity,
-                    ParentPropertyRoute = parentRoute,
-                    PropertyConverter = pc,
-                });
+                pc.CustomReadJsonProperty(new ReadJsonPropertyContext(
+                    jsonReader : reader,
+                    jsonSerializer : serializer,
+                    entity : entity,
+                    parentPropertyRoute : parentRoute,
+                    propertyConverter : pc
+                ));
             }
             else
             {
 
-                object oldValue = pc.GetValue(entity);
+                object? oldValue = pc.GetValue!(entity);
 
-                var pi = pc.PropertyValidator.PropertyInfo;
+                var pi = pc.PropertyValidator!.PropertyInfo;
 
                 var pr = parentRoute.Add(pi);
 
@@ -359,7 +376,7 @@ public void ReadJsonProperty(JsonReader reader, JsonSerializer serializer, Modif
             }
         }
 
-        private bool IsEquals(object newValue, object oldValue)
+        private bool IsEquals(object newValue, object? oldValue)
         {
             if (newValue is byte[] && oldValue is byte[])
                 return MemCompare.Compare((byte[])newValue, (byte[])oldValue);
@@ -515,4 +532,4 @@ public static bool Compare(byte[] b1, byte[] b2)
             return b1.Length == b2.Length && memcmp(b1, b2, b1.Length) == 0;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.React/JsonConverters/JsonSerializerExtensions.cs b/Signum.React/JsonConverters/JsonSerializerExtensions.cs
index 49bb54bcc8..cff0f89f5b 100644
--- a/Signum.React/JsonConverters/JsonSerializerExtensions.cs
+++ b/Signum.React/JsonConverters/JsonSerializerExtensions.cs
@@ -8,7 +8,7 @@ namespace Signum.React.Json
 {
     public static class JsonSerializerExtensions
     {
-        public static object DeserializeValue(this JsonSerializer serializer, JsonReader reader, Type valueType, object oldValue)
+        public static object DeserializeValue(this JsonSerializer serializer, JsonReader reader, Type valueType, object? oldValue)
         {
             if (oldValue != null)
             {
@@ -31,14 +31,14 @@ public static void Assert(this JsonReader reader, JsonToken expected)
         }
 
 
-        static readonly ThreadVariable<PropertyRoute> currentPropertyRoute = Statics.ThreadVariable<PropertyRoute>("jsonPropertyRoute");
+        static readonly ThreadVariable<PropertyRoute?> currentPropertyRoute = Statics.ThreadVariable<PropertyRoute?>("jsonPropertyRoute");
 
-        public static PropertyRoute CurrentPropertyRoute
+        public static PropertyRoute? CurrentPropertyRoute
         {
             get { return currentPropertyRoute.Value; }
         }
 
-        public static IDisposable SetCurrentPropertyRoute(PropertyRoute route)
+        public static IDisposable SetCurrentPropertyRoute(PropertyRoute? route)
         {
             var old = currentPropertyRoute.Value;
 
diff --git a/Signum.React/JsonConverters/LiteJsonConverter.cs b/Signum.React/JsonConverters/LiteJsonConverter.cs
index 89bada16a1..8db15e2258 100644
--- a/Signum.React/JsonConverters/LiteJsonConverter.cs
+++ b/Signum.React/JsonConverters/LiteJsonConverter.cs
@@ -1,4 +1,4 @@
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 using Signum.Engine.Basics;
 using Signum.Entities;
 using System;
@@ -36,17 +36,17 @@ public override void WriteJson(JsonWriter writer, object value, JsonSerializer s
             writer.WriteEndObject();
         }
 
-        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        public override object? ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
         {
             if (reader.TokenType == JsonToken.Null)
                 return null;
 
             reader.Assert(JsonToken.StartObject);
 
-            string toString = null;
-            string idObj = null;
-            string typeStr = null;
-            Entity entity = null;
+            string? toString = null;
+            string? idObj = null;
+            string? typeStr = null;
+            Entity? entity = null;
 
             reader.Read();
             while (reader.TokenType == JsonToken.PropertyName)
@@ -68,12 +68,12 @@ public override object ReadJson(JsonReader reader, Type objectType, object exist
 
             reader.Assert(JsonToken.EndObject);
 
-            Type type = TypeLogic.GetType(typeStr);
+            Type type = TypeLogic.GetType(typeStr!);
 
             PrimaryKey? idOrNull = idObj == null ? (PrimaryKey?)null : PrimaryKey.Parse(idObj, type);
 
             if (entity == null)
-                return Lite.Create(type, idOrNull.Value, toString);
+                return Lite.Create(type, idOrNull.Value, toString!);
 
             var result = entity.ToLiteFat(toString);
 
@@ -85,7 +85,7 @@ public override object ReadJson(JsonReader reader, Type objectType, object exist
 
             var existing = existingValue as Lite<Entity>;
 
-            if (existing.Is(result) && existing.EntityOrNull == null && result.EntityOrNull != null)
+            if (existing.Is(result) && existing!.EntityOrNull == null && result.EntityOrNull != null)
             {
                 existing.SetEntity(result.EntityOrNull);
                 return existing;
@@ -96,4 +96,4 @@ public override object ReadJson(JsonReader reader, Type objectType, object exist
     }
 
 
-}
\ No newline at end of file
+}
diff --git a/Signum.React/JsonConverters/MListJsonConverter.cs b/Signum.React/JsonConverters/MListJsonConverter.cs
index e254d0c5e6..f8077db8d0 100644
--- a/Signum.React/JsonConverters/MListJsonConverter.cs
+++ b/Signum.React/JsonConverters/MListJsonConverter.cs
@@ -1,4 +1,4 @@
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 using Signum.Engine;
 using Signum.Engine.Maps;
 using Signum.Entities;
@@ -20,7 +20,7 @@ public override bool CanConvert(Type objectType)
 
         public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
         {
-            giWriteJsonInternal.GetInvoker(value.GetType().ElementType())(writer, (IMListPrivate)value, serializer);
+            giWriteJsonInternal.GetInvoker(value.GetType().ElementType()!)(writer, (IMListPrivate)value, serializer);
         }
 
         static GenericInvoker<Action<JsonWriter, IMListPrivate, JsonSerializer>> giWriteJsonInternal = new GenericInvoker<Action<JsonWriter, IMListPrivate, JsonSerializer>>(
@@ -29,7 +29,7 @@ public override void WriteJson(JsonWriter writer, object value, JsonSerializer s
         static void WriteJsonInternal<T>(JsonWriter writer, MList<T> value, JsonSerializer serializer)
         {
             writer.WriteStartArray();
-            var pr = JsonSerializerExtensions.CurrentPropertyRoute;
+            var pr = JsonSerializerExtensions.CurrentPropertyRoute!;
 
             var elementPr = pr.Add("Item");
 
@@ -54,7 +54,7 @@ static void WriteJsonInternal<T>(JsonWriter writer, MList<T> value, JsonSerializ
 
         public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
         {
-            return giReadJsonInternal.GetInvoker(objectType.ElementType())(reader, (IMListPrivate)existingValue, serializer);
+            return giReadJsonInternal.GetInvoker(objectType.ElementType()!)(reader, (IMListPrivate)existingValue, serializer);
         }
 
         static GenericInvoker<Func<JsonReader, IMListPrivate, JsonSerializer, IMListPrivate>> giReadJsonInternal =
@@ -68,7 +68,7 @@ static MList<T> ReadJsonInternal<T>(JsonReader reader, IMListPrivate<T> existing
 
             var newList = new List<MList<T>.RowIdElement>();
 
-            var pr = JsonSerializerExtensions.CurrentPropertyRoute;
+            var pr = JsonSerializerExtensions.CurrentPropertyRoute!;
 
             var elementPr = pr.Add("Item");
 
@@ -99,7 +99,7 @@ static MList<T> ReadJsonInternal<T>(JsonReader reader, IMListPrivate<T> existing
                     reader.Read();
                     if (rowIdValue != null && !rowIdValue.Equals(GraphExplorer.DummyRowId.Object))
                     {
-                        var rowId = new PrimaryKey((IComparable)ReflectionTools.ChangeType(rowIdValue, rowIdType));
+                        var rowId = new PrimaryKey((IComparable)ReflectionTools.ChangeType(rowIdValue, rowIdType)!);
 
                         var oldValue = dic.TryGetS(rowId);
 
@@ -113,7 +113,7 @@ static MList<T> ReadJsonInternal<T>(JsonReader reader, IMListPrivate<T> existing
                         {
                             T newValue = (T)serializer.DeserializeValue(reader, typeof(T), oldValue.Value.Element);
 
-                            if (oldValue.Value.Element.Equals(newValue))
+                            if (oldValue.Value.Element!.Equals(newValue))
                                 newList.Add(new MList<T>.RowIdElement(newValue, rowId, oldValue.Value.OldIndex));
                             else
                                 newList.Add(new MList<T>.RowIdElement(newValue));
@@ -137,7 +137,7 @@ static MList<T> ReadJsonInternal<T>(JsonReader reader, IMListPrivate<T> existing
             if (existingValue == null) //Strange case...
             {
                 if (newList.IsEmpty())
-                    return null;
+                    return null!;
                 else
                     existingValue = new MList<T>();
             }
@@ -158,7 +158,7 @@ private static Type GetRowIdTypeFromAttribute(PropertyRoute route)
         {
             var settings = Schema.Current.Settings;
             var att = settings.FieldAttribute<PrimaryKeyAttribute>(route) ??
-                (route.IsVirtualMList() ? settings.TypeAttribute<PrimaryKeyAttribute>(route.Type.ElementType()) : null) ??
+                (route.IsVirtualMList() ? settings.TypeAttribute<PrimaryKeyAttribute>(route.Type.ElementType()!) : null) ??
                 settings.DefaultPrimaryKeyAttribute;
 
             return att.Type;
@@ -173,4 +173,4 @@ private static bool GetPreserveOrderFromAttribute(PropertyRoute route)
     }
 
 
-}
\ No newline at end of file
+}
diff --git a/Signum.React/JsonConverters/TimeSpanConverter.cs b/Signum.React/JsonConverters/TimeSpanConverter.cs
index 842a7584e5..253dc4ccc2 100644
--- a/Signum.React/JsonConverters/TimeSpanConverter.cs
+++ b/Signum.React/JsonConverters/TimeSpanConverter.cs
@@ -1,4 +1,4 @@
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 using Signum.Utilities;
 using System;
 
@@ -16,7 +16,7 @@ public override void WriteJson(JsonWriter writer, object value, JsonSerializer s
             writer.WriteValue(((TimeSpan?) value)?.ToString());
         }
 
-        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        public override object? ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
         {
             var str = reader.Value as string;
             return string.IsNullOrEmpty(str) ? (TimeSpan?)null : TimeSpan.Parse(str);
@@ -24,4 +24,4 @@ public override object ReadJson(JsonReader reader, Type objectType, object exist
     }
 
 
-}
\ No newline at end of file
+}
diff --git a/Signum.React/JsonModelValidators/DefaultValidator.cs b/Signum.React/JsonModelValidators/DefaultValidator.cs
index 609c05e226..91e8e71796 100644
--- a/Signum.React/JsonModelValidators/DefaultValidator.cs
+++ b/Signum.React/JsonModelValidators/DefaultValidator.cs
@@ -1,4 +1,4 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
@@ -73,11 +73,11 @@ public ValidationVisitor(
         protected ValidationStack CurrentPath { get; }
 #pragma warning restore PUB0001
 
-        protected object Container { get; set; }
-        protected string Key { get; set; }
-        protected object Model { get; set; }
-        protected ModelMetadata Metadata { get; set; }
-        protected IValidationStrategy Strategy { get; set; }
+        protected object? Container { get; set; }
+        protected string? Key { get; set; }
+        protected object? Model { get; set; }
+        protected ModelMetadata? Metadata { get; set; }
+        protected IValidationStrategy? Strategy { get; set; }
 
         /// <summary>
         /// Indicates whether validation of a complex type should be performed if validation fails for any of its children. The default behavior is false.
@@ -103,7 +103,7 @@ public bool Validate(ModelMetadata metadata, string key, object model)
         /// <param name="model">The model object.</param>
         /// <param name="alwaysValidateAtTopLevel">If <c>true</c>, applies validation rules even if the top-level value is <c>null</c>.</param>
         /// <returns><c>true</c> if the object is valid, otherwise <c>false</c>.</returns>
-        public virtual bool Validate(ModelMetadata metadata, string key, object model, bool alwaysValidateAtTopLevel)
+        public virtual bool Validate(ModelMetadata? metadata, string key, object model, bool alwaysValidateAtTopLevel)
         {
             if (model == null && key != null && !alwaysValidateAtTopLevel)
             {
@@ -181,7 +181,7 @@ protected virtual bool ValidateNode()
             }
         }
 
-        protected virtual bool Visit(ModelMetadata metadata, string key, object model)
+        protected virtual bool Visit(ModelMetadata? metadata, string key, object model)
         {
             RuntimeHelpers.EnsureSufficientExecutionStack();
 
@@ -211,7 +211,7 @@ protected virtual bool Visit(ModelMetadata metadata, string key, object model)
 
             using (StateManager.Recurse(this, key ?? string.Empty, metadata, model, strategy))
             {
-                if (Metadata.IsEnumerableType)
+                if (Metadata!.IsEnumerableType)
                 {
                     return VisitComplexType(DefaultCollectionValidationStrategy.Instance);
                 }
@@ -230,7 +230,7 @@ protected virtual bool VisitComplexType(IValidationStrategy defaultStrategy)
         {
             var isValid = true;
 
-            if (Model != null && Metadata.ValidateChildren)
+            if (Model != null && Metadata!.ValidateChildren)
             {
                 var strategy = Strategy ?? defaultStrategy;
                 isValid = VisitChildren(strategy);
@@ -240,7 +240,7 @@ protected virtual bool VisitComplexType(IValidationStrategy defaultStrategy)
                 // Suppress validation for the entries matching this prefix. This will temporarily set
                 // the current node to 'skipped' but we're going to visit it right away, so subsequent
                 // code will set it to 'valid' or 'invalid'
-                SuppressValidation(Key);
+                SuppressValidation(Key!);
             }
 
             // Double-checking HasReachedMaxErrors just in case this model has no properties.
@@ -257,7 +257,7 @@ protected virtual bool VisitSimpleType()
         {
             if (ModelState.HasReachedMaxErrors)
             {
-                SuppressValidation(Key);
+                SuppressValidation(Key!);
                 return false;
             }
 
@@ -303,12 +303,10 @@ protected virtual void SuppressValidation(string key)
             }
         }
 
-        protected virtual ValidationStateEntry GetValidationEntry(object model)
+        protected virtual ValidationStateEntry? GetValidationEntry(object model)
         {
             if (model == null || ValidationState == null)
-            {
                 return null;
-            }
 
             ValidationState.TryGetValue(model, out var entry);
             return entry;
@@ -320,16 +318,16 @@ protected struct StateManager : IDisposable
             private readonly object _container;
             private readonly string _key;
             private readonly ModelMetadata _metadata;
-            private readonly object _model;
-            private readonly object _newModel;
-            private readonly IValidationStrategy _strategy;
+            private readonly object? _model;
+            private readonly object? _newModel;
+            private readonly IValidationStrategy? _strategy;
 
             public static StateManager Recurse(
                 ValidationVisitor visitor,
                 string key,
-                ModelMetadata metadata,
-                object model,
-                IValidationStrategy strategy)
+                ModelMetadata? metadata,
+                object? model,
+                IValidationStrategy? strategy)
             {
                 var recursifier = new StateManager(visitor, model);
 
@@ -342,15 +340,15 @@ public static StateManager Recurse(
                 return recursifier;
             }
 
-            public StateManager(ValidationVisitor visitor, object newModel)
+            public StateManager(ValidationVisitor visitor, object? newModel)
             {
                 _visitor = visitor;
                 _newModel = newModel;
 
-                _container = _visitor.Container;
-                _key = _visitor.Key;
-                _metadata = _visitor.Metadata;
-                _model = _visitor.Model;
+                _container = _visitor.Container!;
+                _key = _visitor.Key!;
+                _metadata = _visitor.Metadata!;
+                _model = _visitor.Model!;
                 _strategy = _visitor.Strategy;
             }
 
@@ -366,4 +364,4 @@ public void Dispose()
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.React/JsonModelValidators/SignumObjectValidator.cs b/Signum.React/JsonModelValidators/SignumObjectValidator.cs
index b261f8d62d..036aabda62 100644
--- a/Signum.React/JsonModelValidators/SignumObjectValidator.cs
+++ b/Signum.React/JsonModelValidators/SignumObjectValidator.cs
@@ -174,7 +174,7 @@ private bool ValidateLite(Lite<Entity> lite)
         private bool ValidateMList(IMListPrivate mlist)
         {
             bool isValid = true;
-            Type elementType = mlist.GetType().ElementType();
+            Type elementType = mlist.GetType().ElementType()!;
 
             int i = 0;
             foreach (object element in (IEnumerable)mlist)
@@ -212,15 +212,14 @@ private bool ValidateModifiableEntity(ModifiableEntity mod)
                         if (kvp.Value.AvoidValidate)
                             continue;
 
-                        string error = kvp.Value.PropertyValidator.PropertyCheck(mod);
-
+                        string? error = kvp.Value.PropertyValidator!.PropertyCheck(mod);
                         if (error != null)
                         {
                             isValid = false;
                             ModelState.AddModelError(this.Key + "." + kvp.Key, error);
                         }
 
-                        var val = kvp.Value.GetValue(mod);
+                        var val = kvp.Value.GetValue!(mod);
                         if (this.CurrentPath.Push(val))
                         {
                             using (StateManager.Recurse(this, this.Key + "." + kvp.Key, null, val, null))
diff --git a/Signum.React/Scripts/Signum.Entities.Basics.ts b/Signum.React/Scripts/Signum.Entities.Basics.ts
index 98310ed3fa..5c01566fb3 100644
--- a/Signum.React/Scripts/Signum.Entities.Basics.ts
+++ b/Signum.React/Scripts/Signum.Entities.Basics.ts
@@ -24,7 +24,7 @@ export interface DeleteLogParametersEmbedded extends Entities.EmbeddedEntity {
 export const DeleteLogsTypeOverridesEmbedded = new Type<DeleteLogsTypeOverridesEmbedded>("DeleteLogsTypeOverridesEmbedded");
 export interface DeleteLogsTypeOverridesEmbedded extends Entities.EmbeddedEntity {
   Type: "DeleteLogsTypeOverridesEmbedded";
-  type?: Entities.Lite<TypeEntity> | null;
+  type?: Entities.Lite<TypeEntity>;
   deleteLogsWithMoreThan?: number | null;
   cleanLogsWithMoreThan?: number | null;
 }
@@ -34,12 +34,12 @@ export interface ExceptionEntity extends Entities.Entity {
   Type: "Exception";
   creationDate?: string;
   exceptionType?: string | null;
-  exceptionMessage?: string | null;
+  exceptionMessage?: string;
   exceptionMessageHash?: number;
-  stackTrace?: string | null;
+  stackTrace?: string;
   stackTraceHash?: number;
   threadId?: number;
-  user?: Entities.Lite<IUserEntity> | null;
+  user?: Entities.Lite<IUserEntity>;
   environment?: string | null;
   version?: string | null;
   userAgent?: string | null;
@@ -65,40 +65,40 @@ export interface IUserEntity extends Entities.Entity {
 export const OperationLogEntity = new Type<OperationLogEntity>("OperationLog");
 export interface OperationLogEntity extends Entities.Entity {
   Type: "OperationLog";
-  target: Entities.Lite<Entities.Entity> | null;
-  origin: Entities.Lite<Entities.Entity> | null;
-  operation: Entities.OperationSymbol | null;
-  user: Entities.Lite<IUserEntity> | null;
+  target: Entities.Lite<Entities.Entity>;
+  origin: Entities.Lite<Entities.Entity>;
+  operation: Entities.OperationSymbol;
+  user: Entities.Lite<IUserEntity>;
   start: string;
   end: string | null;
-  exception: Entities.Lite<ExceptionEntity> | null;
+  exception: Entities.Lite<ExceptionEntity>;
 }
 
 export const PropertyRouteEntity = new Type<PropertyRouteEntity>("PropertyRoute");
 export interface PropertyRouteEntity extends Entities.Entity {
   Type: "PropertyRoute";
-  path: string | null;
+  path: string;
   rootType: TypeEntity;
 }
 
 export const QueryEntity = new Type<QueryEntity>("Query");
 export interface QueryEntity extends Entities.Entity {
   Type: "Query";
-  key: string | null;
+  key: string;
 }
 
 export interface SemiSymbol extends Entities.Entity {
   key?: string | null;
-  name?: string | null;
+  name?: string;
 }
 
 export const TypeEntity = new Type<TypeEntity>("Type");
 export interface TypeEntity extends Entities.Entity {
   Type: "Type";
-  tableName: string | null;
-  cleanName: string | null;
-  namespace: string | null;
-  className: string | null;
+  tableName: string;
+  cleanName: string;
+  namespace: string;
+  className: string;
 }
 
 
diff --git a/Signum.React/Scripts/Signum.Entities.ts b/Signum.React/Scripts/Signum.Entities.ts
index 5cd7dbee18..b33677adbd 100644
--- a/Signum.React/Scripts/Signum.Entities.ts
+++ b/Signum.React/Scripts/Signum.Entities.ts
@@ -471,7 +471,7 @@ export module SelectorMessage {
 }
 
 export interface Symbol extends Entity {
-  key: string | null;
+  key: string;
 }
 
 export module SynchronizerMessage {
diff --git a/Signum.React/Signum.React.csproj b/Signum.React/Signum.React.csproj
index 1d59fccd5e..c33ebdbc2b 100644
--- a/Signum.React/Signum.React.csproj
+++ b/Signum.React/Signum.React.csproj
@@ -7,9 +7,15 @@
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
     <NullableContextOptions>enable</NullableContextOptions>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <OutputType>Library</OutputType>
+    <StartupObject></StartupObject>
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <NoWarn>1701;1702;8629</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.App" />
     <PackageReference Include="Microsoft.TypeScript.MSBuild" Version="3.2.3">
@@ -24,7 +30,7 @@
   
   <ItemGroup>
     <PackageReference Include="Signum.Analyzer" Version="1.0.1" />
-    <PackageReference Include="Signum.TSGenerator" Version="1.0.3" />
+    <PackageReference Include="Signum.TSGenerator" Version="2.0.0-beta" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/Signum.TSGenerator/EntityDeclarationGenerator.cs b/Signum.TSGenerator/EntityDeclarationGenerator.cs
index acb0020e04..f4c543959f 100644
--- a/Signum.TSGenerator/EntityDeclarationGenerator.cs
+++ b/Signum.TSGenerator/EntityDeclarationGenerator.cs
@@ -1,4 +1,4 @@
-using Mono.Cecil;
+using Mono.Cecil;
 using System;
 using System.Collections;
 using System.Collections.Generic;
@@ -480,14 +480,10 @@ public static bool GetTypescriptNull(this PropertyDefinition p)
             if (IsCollection(p.PropertyType))
                 return false;
 
-            if (GetTypescriptUndefined(p.DeclaringType) == false &&
-                p.CustomAttributes.Any(a =>
-                a.AttributeType.Name == "NotNullableAttribute" ||
-                a.AttributeType.Name == "NotNullValidatorAttribute" ||
-                a.AttributeType.Name == "StringLengthValidatorAttribute" && a.Properties.Any(na => na.Name == "AllowNulls" && false.Equals(na.Argument.Value))))
-                return false;
-
-            return !p.PropertyType.IsValueType || p.PropertyType.UnNullify() != p.PropertyType;
+            if (p.PropertyType.IsValueType)
+                return p.PropertyType.IsNullable();
+            else
+                return p.CustomAttributes.Any(a => a.AttributeType.Name == "NullableAttribute" && ((byte)2).Equals(a.ConstructorArguments[0].Value));
         }
 
         private static string FirstLower(string name)
@@ -495,6 +491,11 @@ private static string FirstLower(string name)
             return char.ToLowerInvariant(name[0]) + name.Substring(1);
         }
 
+        public static bool IsNullable(this TypeReference type)
+        {
+            return type is GenericInstanceType gtype && gtype.ElementType.Name == "Nullable`1";
+        }
+
         public static TypeReference UnNullify(this TypeReference type)
         {
             return type is GenericInstanceType gtype && gtype.ElementType.Name == "Nullable`1" ? gtype.GenericArguments.Single() : type;
diff --git a/Signum.TSGenerator/Properties/launchSettings.json b/Signum.TSGenerator/Properties/launchSettings.json
index 631d48475e..c7ae0b7438 100644
--- a/Signum.TSGenerator/Properties/launchSettings.json
+++ b/Signum.TSGenerator/Properties/launchSettings.json
@@ -2,8 +2,8 @@
   "profiles": {
     "Signum.TSGenerator": {
       "commandName": "Project",
-      "commandLineArgs": "\"obj\\Debug\\netcoreapp2.1\\Signum.React.Extensions.dll\" \"D:\\Signum\\SouthwindCore\\Extensions\\Signum.React.Extensions\\obj\\SignumReferences.txt\" \"D:\\Signum\\SouthwindCore\\Extensions\\Signum.React.Extensions\\obj\\SignumContent.txt\"",
-      "workingDirectory": "D:\\Signum\\SouthwindCore\\Extensions\\Signum.React.Extensions\\"
+      "commandLineArgs": "\"obj\\Debug\\netcoreapp2.1\\Signum.React.dll\" \"D:\\Signum\\Southwind\\Framework\\Signum.React\\obj\\SignumReferences.txt\" \"D:\\Signum\\Southwind\\Framework\\Signum.React\\obj\\SignumContent.txt\"",
+      "workingDirectory": "D:\\Signum\\Southwind\\Framework\\Signum.React\\"
     }
   }
 }
\ No newline at end of file
diff --git a/Signum.TSGenerator/Signum.TSGenerator.csproj b/Signum.TSGenerator/Signum.TSGenerator.csproj
index 11cd4341d4..b9cf6bc8c8 100644
--- a/Signum.TSGenerator/Signum.TSGenerator.csproj
+++ b/Signum.TSGenerator/Signum.TSGenerator.csproj
@@ -9,7 +9,7 @@
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
     <LangVersion>latest</LangVersion>
     <Platforms>x64</Platforms>
-    <Version>1.0.3</Version>
+    <Version>2.0.0-beta</Version>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/Signum.TSGenerator/Signum.TSGenerator.nuspec b/Signum.TSGenerator/Signum.TSGenerator.nuspec
index 7c67f6bd45..820edc202d 100644
--- a/Signum.TSGenerator/Signum.TSGenerator.nuspec
+++ b/Signum.TSGenerator/Signum.TSGenerator.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>Signum.TSGenerator</id>
-    <version>1.0.3</version>
+    <version>2.0.0-beta</version>
     <title>TypeScript generator for Signum Framework applications</title>
     <authors>Olmo del Corral</authors>
     <licenseUrl>https://opensource.org/licenses/MIT</licenseUrl>
diff --git a/Signum.Utilities/Reflection/ReflectionTools.cs b/Signum.Utilities/Reflection/ReflectionTools.cs
index 0bcec9612f..98be3eed45 100644
--- a/Signum.Utilities/Reflection/ReflectionTools.cs
+++ b/Signum.Utilities/Reflection/ReflectionTools.cs
@@ -724,7 +724,7 @@ public static T ChangeType<T>(object value)
             }
         }
 
-        public static object? ChangeType(object value, Type type)
+        public static object? ChangeType(object? value, Type type)
         {
             if (value == null)
                 return null;
diff --git a/Signum.Utilities/Tsv.cs b/Signum.Utilities/Tsv.cs
index 11c6492552..af92cc2fae 100644
--- a/Signum.Utilities/Tsv.cs
+++ b/Signum.Utilities/Tsv.cs
@@ -120,7 +120,7 @@ public static void ToTsv<T>(this IEnumerable<T> collection, Stream stream, Encod
             }
         }
 
-        private static Func<object, string> GetToString<T>(TsvColumnInfo<T> column, CultureInfo? culture, Func<TsvColumnInfo<T>, Func<object, string>>? toStringFactory)
+        private static Func<object, string> GetToString<T>(TsvColumnInfo<T> column, CultureInfo culture, Func<TsvColumnInfo<T>, Func<object, string>>? toStringFactory)
         {
             if (toStringFactory != null)
             {

From 0cdaaa2324948f264c9c00dc858995f4e0a38544 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Sun, 10 Feb 2019 13:45:13 +0100
Subject: [PATCH 17/25] remove AutoPropertyAnalyzer

---
 .../Signum.Analyzer.Test/AutoPropertyTest.cs  | 234 ------------------
 .../Signum.Analyzer/AutoPropertyAnalyzer.cs   | 162 ------------
 .../AutoPropertyCodeFixProvider.cs            | 132 ----------
 3 files changed, 528 deletions(-)
 delete mode 100644 Signum.Analyzer/Signum.Analyzer.Test/AutoPropertyTest.cs
 delete mode 100644 Signum.Analyzer/Signum.Analyzer/AutoPropertyAnalyzer.cs
 delete mode 100644 Signum.Analyzer/Signum.Analyzer/AutoPropertyCodeFixProvider.cs

diff --git a/Signum.Analyzer/Signum.Analyzer.Test/AutoPropertyTest.cs b/Signum.Analyzer/Signum.Analyzer.Test/AutoPropertyTest.cs
deleted file mode 100644
index f4a913ac67..0000000000
--- a/Signum.Analyzer/Signum.Analyzer.Test/AutoPropertyTest.cs
+++ /dev/null
@@ -1,234 +0,0 @@
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CodeFixes;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-using System;
-using TestHelper;
-using Signum.Analyzer;
-
-namespace Signum.Analyzer.Test
-{
-    [TestClass]
-    public class AutoPropertyTest : CodeFixVerifier
-    {
-        protected override CodeFixProvider GetCSharpCodeFixProvider()
-        {
-            return new AutoPropertyCodeFixProvider();
-        }
-
-        protected override DiagnosticAnalyzer GetCSharpDiagnosticAnalyzer()
-        {
-            return new AutoPropertyAnalyzer();
-        }
-
-        //Diagnostic and CodeFix both triggered and checked for
-        [TestMethod]
-        public void AutoPropTest1()
-        {
-            var test = @"
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Diagnostics;
-using Signum.Entities;
-
-namespace ConsoleApplication1
-{
-    class MyEntity : Entity
-    {   
-        [NotNullable, SqlDbType(Size = 24)]
-        string phone;
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 24), TelephoneValidator]
-        public string Phone
-        {
-            get { return phone; }
-            set { Set(ref phone, value); }
-        }
-    }
-}";
-
-            VerifyCSharpDiagnostic(test, new DiagnosticResult
-            {
-                Id = AutoPropertyAnalyzer.DiagnosticId,
-                Message = "Properties in 'MyEntity' could be transformed to auto-property",
-                Severity = DiagnosticSeverity.Warning,
-            });
-
-            var fixtest = @"
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Diagnostics;
-using Signum.Entities;
-
-namespace ConsoleApplication1
-{
-    class MyEntity : Entity
-    {
-        [NotNullable, SqlDbType(Size = 24)]
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 24), TelephoneValidator]
-        public string Phone { get; set; }
-    }
-}";
-            VerifyCSharpFix(test, fixtest);
-        }
-
-
-        [TestMethod]
-        public void AutoPropTest2()
-        {
-            var test = @"
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Diagnostics;
-using Signum.Entities;
-using Signum.Utilities;
-using System.Linq.Expressions;
-
-namespace ConsoleApplication1
-{
-    class MyEntity : Entity
-    {
-        [NotNullable, SqlDbType(Size = 24)]
-        string phone;
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 24), TelephoneValidator]
-        public string Phone
-        {
-            get { return phone; }
-            set { Set(ref phone, value); }
-        }
-
-        string bla;
-        public string SuperPhone => Phone;
-
-        [NotNullable, SqlDbType(Size = 24)]
-        string phone2;
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 24), TelephoneValidator]
-        public string Phone2
-        {
-            get { return phone2; }
-            internal set { SetToStr(ref phone2, value); }
-        }
-
-        int number;
-        public int Number
-        {
-            get { return number; }
-            set { Set(ref number, value); }
-        }
-
-        DateTime creationDate = TimeZoneManager.Now;
-        public DateTime CreationDate
-        {
-            get { return creationDate; }
-            private set { Set(ref creationDate, value); }
-        }
-
-        int? synchronizeSchema;       
-        [Unit(""ms"")]
-        public int? SynchronizeSchema
-        {
-            get { return synchronizeSchema; }
-            set { Set(ref synchronizeSchema, value); }
-        }
-
-        object queryName;
-        [NotNullValidator]
-        public object QueryName
-        {
-            get { return queryName; }
-        }
-
-        [NonSerialized]
-        bool needNewQuery;
-        public bool NeedNewQuery
-        {
-            get { return needNewQuery; }
-            set { Set(ref needNewQuery, value); }
-        }
-
-        static Expression<Func<MyEntity, string>> ToStringExpressions =
-            entity => entity.phone2;
-        public override string ToString()
-        {
-            return ToStringExpressions.Evaluate(this);
-        }
-    }
-}";
-
-            VerifyCSharpDiagnostic(test, new DiagnosticResult
-            {
-                Id = AutoPropertyAnalyzer.DiagnosticId,
-                Message = "Properties in 'MyEntity' could be transformed to auto-property",
-                Severity = DiagnosticSeverity.Warning
-            });
-
-            var fixtest = @"
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Diagnostics;
-using Signum.Entities;
-using Signum.Utilities;
-using System.Linq.Expressions;
-
-namespace ConsoleApplication1
-{
-    class MyEntity : Entity
-    {
-        [NotNullable, SqlDbType(Size = 24)]
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 24), TelephoneValidator]
-        public string Phone { get; set; }
-
-        string bla;
-        public string SuperPhone => Phone;
-
-        [NotNullable, SqlDbType(Size = 24)]
-        [StringLengthValidator(AllowNulls = false, Min = 3, Max = 24), TelephoneValidator]
-        public string Phone2 { get; internal set; }
-
-        public int Number { get; set; }
-
-        public DateTime CreationDate { get; private set; } = TimeZoneManager.Now;
-
-        [Unit(""ms"")]
-        public int? SynchronizeSchema { get; set; }
-
-        object queryName;
-        [NotNullValidator]
-        public object QueryName
-        {
-            get { return queryName; }
-        }
-
-        [NonSerialized]
-        bool needNewQuery;
-        public bool NeedNewQuery
-        {
-            get { return needNewQuery; }
-            set { Set(ref needNewQuery, value); }
-        }
-
-        static Expression<Func<MyEntity, string>> ToStringExpressions =
-            entity => entity.Phone2;
-        public override string ToString()
-        {
-            return ToStringExpressions.Evaluate(this);
-        }
-    }
-}";
-            VerifyCSharpFix(test, fixtest);
-        }
-        
-
-    }
-}
\ No newline at end of file
diff --git a/Signum.Analyzer/Signum.Analyzer/AutoPropertyAnalyzer.cs b/Signum.Analyzer/Signum.Analyzer/AutoPropertyAnalyzer.cs
deleted file mode 100644
index f17d567864..0000000000
--- a/Signum.Analyzer/Signum.Analyzer/AutoPropertyAnalyzer.cs
+++ /dev/null
@@ -1,162 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Collections.Immutable;
-using System.Linq;
-using System.Threading;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace Signum.Analyzer
-{
-    [DiagnosticAnalyzer(LanguageNames.CSharp)]
-    public class AutoPropertyAnalyzer : DiagnosticAnalyzer
-    {
-        public const string DiagnosticId = "SF0001";
-
-        internal static DiagnosticDescriptor Rule = new DiagnosticDescriptor(DiagnosticId, 
-            "Use auto-properties in entities",
-            "Properties in '{0}' could be transformed to auto-property", "Entities", 
-            DiagnosticSeverity.Warning, 
-            isEnabledByDefault: true,
-            description: "Entities with auto-properties will be converted by a Signum.MsBuildTask into the expanded pattern");
-
-        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get { return ImmutableArray.Create(Rule); } }
-
-        public override void Initialize(AnalysisContext context)
-        {
-            context.RegisterSyntaxNodeAction(AnalyzePropertySymbol, SyntaxKind.ClassDeclaration);
-        }
-
-
-        static void AnalyzePropertySymbol(SyntaxNodeAnalysisContext context)
-        {
-            try
-            {
-
-                var classDeclaration = (ClassDeclarationSyntax)context.Node;
-                var symbol = context.SemanticModel.GetDeclaredSymbol(classDeclaration);
-
-                if (!InheritsFrom(symbol, "Signum.Entities.ModifiableEntity"))
-                    return;
-
-                var properties = classDeclaration.Members.OfType<PropertyDeclarationSyntax>()
-                    .Where(p => IsSimpleProperty(p, classDeclaration))
-                    .ToList();
-
-                if (properties.Count == 0)
-                    return;
-
-                var diagnostic = Diagnostic.Create(Rule, classDeclaration.Identifier.GetLocation(),
-                    properties.Select(p => p.Identifier.GetLocation()),
-                    classDeclaration.Identifier.ToString());
-
-                context.ReportDiagnostic(diagnostic);
-            }
-            catch (Exception e)
-            {
-                throw new Exception(context.SemanticModel.SyntaxTree.FilePath + "\r\n" + e.Message + "\r\n" + e.StackTrace);
-            }
-        }
-
-        static string[] AvoidAttributes = new[] { "NonSerialized" };
-
-        public static bool IsSimpleProperty(PropertyDeclarationSyntax property, ClassDeclarationSyntax classParent)
-        {
-            FieldDeclarationSyntax field = PreviosField(classParent, property);
-            if (field == null)
-                return false;
-
-            if (field.AttributeLists.Any(al => al.Attributes.Any(a => AvoidAttributes.Contains(LastName(a.Name)))))
-                return false;
-
-            if (property.AccessorList == null)
-                return false;
-
-            var getter = property.AccessorList.Accessors.Where(a => a.Kind() == SyntaxKind.GetAccessorDeclaration).Only();
-            if (getter == null || !IsValidGetter(getter, field))
-                return false;
-
-            var setter = property.AccessorList.Accessors.Where(a => a.Kind() == SyntaxKind.SetAccessorDeclaration).Only();
-            if (setter == null || !IsValidSetter(setter, field))
-                return false;
-
-            return true;
-        }
-
-        private static string LastName(NameSyntax s)
-        {
-            if (s is IdentifierNameSyntax)
-                return ((IdentifierNameSyntax)s).Identifier.Text;
-
-            if (s is QualifiedNameSyntax)
-                return LastName(((QualifiedNameSyntax)s).Right);
-
-            return null;
-        }
-
-        public static FieldDeclarationSyntax PreviosField(ClassDeclarationSyntax classParent, PropertyDeclarationSyntax property)
-        {
-            var index = classParent.Members.IndexOf(property);
-            if (index == -1 || index == 0)
-                return null;
-
-            return classParent.Members[index - 1] as FieldDeclarationSyntax;
-        }
-
-        static bool IsValidGetter(AccessorDeclarationSyntax getter, FieldDeclarationSyntax field)
-        {
-            var exp = (getter.Body?.Statements.Only() as ReturnStatementSyntax)?.Expression;
-
-            if (exp == null)
-                return false;
-
-            if (RemoveThis((exp as InvocationExpressionSyntax)?.Expression)?.Identifier.ToFullString() == "Get")
-                exp = ((InvocationExpressionSyntax)exp).ArgumentList.Arguments.FirstOrDefault()?.Expression;
-            
-            return RemoveThis(exp)?.Identifier.Text == field.Declaration.Variables.Only()?.Identifier.Text;
-        }
-
-        private static IdentifierNameSyntax RemoveThis(ExpressionSyntax exp)
-        {
-            if (((exp as MemberAccessExpressionSyntax)?.Expression is ThisExpressionSyntax))
-                exp = (exp as MemberAccessExpressionSyntax).Name;
-            return exp as IdentifierNameSyntax;
-        }
-
-        static bool IsValidSetter(AccessorDeclarationSyntax setter, FieldDeclarationSyntax field)
-        {
-            var exp = (setter.Body?.Statements.Only() as ExpressionStatementSyntax)?.Expression;
-
-            if (exp == null)
-                return false;
-
-            var inv = exp as InvocationExpressionSyntax;
-            if (inv == null)
-                return false;
-
-            var methodName = RemoveThis(inv.Expression)?.Identifier.ToFullString();
-            if (methodName != "Set" && methodName != "SetToStr")
-                return false;
-
-            var firsArg = ((InvocationExpressionSyntax)exp).ArgumentList.Arguments.FirstOrDefault()?.Expression;
-
-            return RemoveThis(firsArg)?.Identifier.Text == field.Declaration.Variables.Only()?.Identifier.Text;
-        }
-
-        static bool InheritsFrom(INamedTypeSymbol symbol, string fullName)
-        {
-            while (true)
-            {
-                if (symbol.ToString() == fullName)
-                    return true;
-
-                if (symbol.BaseType == null)
-                    return false;
-
-                symbol = symbol.BaseType;
-            }
-        }
-    }
-}
diff --git a/Signum.Analyzer/Signum.Analyzer/AutoPropertyCodeFixProvider.cs b/Signum.Analyzer/Signum.Analyzer/AutoPropertyCodeFixProvider.cs
deleted file mode 100644
index aa922315af..0000000000
--- a/Signum.Analyzer/Signum.Analyzer/AutoPropertyCodeFixProvider.cs
+++ /dev/null
@@ -1,132 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Collections.Immutable;
-using System.Composition;
-using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CodeFixes;
-using Microsoft.CodeAnalysis.CodeActions;
-using Microsoft.CodeAnalysis.CSharp;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Rename;
-using Microsoft.CodeAnalysis.Text;
-using Microsoft.CodeAnalysis.Options;
-using Microsoft.CodeAnalysis.Formatting;
-
-namespace Signum.Analyzer
-{
-    [ExportCodeFixProvider(LanguageNames.CSharp, Name = nameof(AutoPropertyCodeFixProvider)), Shared]
-    public class AutoPropertyCodeFixProvider : CodeFixProvider
-    {
-        public sealed override ImmutableArray<string> FixableDiagnosticIds
-        {
-            get { return ImmutableArray.Create(AutoPropertyAnalyzer.DiagnosticId); }
-        }
-
-        public sealed override FixAllProvider GetFixAllProvider()
-        {
-            return WellKnownFixAllProviders.BatchFixer;
-        }
-
-        public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
-        {
-            var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
-            
-            var diagnostic = context.Diagnostics.First();
-            var diagnosticSpan = diagnostic.Location.SourceSpan;
-            
-            var declaration = root.FindToken(diagnosticSpan.Start).Parent.AncestorsAndSelf().OfType<ClassDeclarationSyntax>().First();
-
-            context.RegisterCodeFix(
-                CodeAction.Create("Convert to auto-property", c => AutoPropertyFixer.FixAllProperties(context.Document, declaration, c), "Convert to auto-property"),
-                diagnostic);
-
-            //context.RegisterCodeFix(
-            //    CodeAction.Create("Convert to auto-property", c => AutoPropertyFixer.FixProperty(context.Document, declaration, c), "Convert to auto-property"),
-            //    diagnostic);
-        }
-    }
-
-
-
-    public static class AutoPropertyFixer
-    {
-        public static async Task<Solution> FixAllProperties(Document document, ClassDeclarationSyntax parentClass, CancellationToken cancellationToken)
-        {
-            var currentSolution = document.Project.Solution;
-            var currentDocument = document;
-            var currentClass = parentClass;
-
-            while(true)
-            {
-                var property = currentClass.Members.OfType<PropertyDeclarationSyntax>().FirstOrDefault(p => AutoPropertyAnalyzer.IsSimpleProperty(p, currentClass));
-                if (property == null)
-                    return currentSolution;
-                try {
-                    currentSolution = await FixProperty(currentDocument, property, cancellationToken);
-                    currentDocument = currentSolution.GetDocument(currentDocument.Id);
-                    currentClass = (await currentDocument.GetSyntaxRootAsync()).DescendantNodes().OfType<ClassDeclarationSyntax>()
-                        .FirstOrDefault(a => a.Identifier.ToString() == currentClass.Identifier.ToString());
-                }
-                catch (Exception)
-                {
-                    return currentSolution;
-                }
-            }
-        }
-
-        public static async Task<Solution> FixProperty(Document document, PropertyDeclarationSyntax property, CancellationToken cancellationToken)
-        {
-            var classParent = (ClassDeclarationSyntax)property.Parent;
-
-            var field = AutoPropertyAnalyzer.PreviosField(classParent, property);
-            var fieldVariable = field.Declaration.Variables.Single();
-
-            var semanticModel = await document.GetSemanticModelAsync();
-            var symbol = semanticModel.GetDeclaredSymbol(fieldVariable);
-            var solution = document.Project.Solution;
-            solution = await Renamer.RenameSymbolAsync(solution, symbol, property.Identifier.ToString(), solution.Workspace.Options, cancellationToken);
-
-            document = solution.GetDocument(document.Id);
-            var root = await document.GetSyntaxRootAsync();
-            classParent = root.DescendantNodes().OfType<ClassDeclarationSyntax>().SingleOrDefault(c => c.Identifier.IsEquivalentTo(classParent.Identifier));
-            field = classParent.Members.OfType<FieldDeclarationSyntax>().SingleOrDefault(f => f.Declaration.Variables.Any(v => v.Identifier.ToString() == property.Identifier.ToString()));
-            fieldVariable = field.Declaration.Variables.Single();
-
-            var oldProperty = classParent.Members.OfType<PropertyDeclarationSyntax>().SingleOrDefault(a => a.Identifier.ToString() == property.Identifier.ToString());
-
-            var newProperty = SyntaxFactory.PropertyDeclaration(
-                new SyntaxList<AttributeListSyntax>().AddRange(field.AttributeLists).AddRange(oldProperty.AttributeLists),
-                oldProperty.Modifiers,
-                oldProperty.Type,
-                null,
-                oldProperty.Identifier,
-                SyntaxFactory.AccessorList(SyntaxFactory.List(
-                    property.AccessorList.Accessors.Select(a => a.WithBody(null).WithSemicolonToken(SyntaxFactory.Token(SyntaxKind.SemicolonToken)))
-                )));
-            
-            var leading = field.DescendantTokens().First().LeadingTrivia;
-
-            var first = newProperty.DescendantTokens().First();
-            newProperty = newProperty.ReplaceToken(first, first.WithLeadingTrivia(leading));
-
-
-            if (fieldVariable.Initializer != null)
-                newProperty = newProperty.WithInitializer(fieldVariable.Initializer).WithSemicolonToken(field.SemicolonToken);
-
-            var members = classParent.Members.Replace(oldProperty, newProperty);
-            members = members.Remove(members.Single(m => m.IsEquivalentTo(field)));
-            var newClass = classParent.WithMembers(members);
-
-            var docNode = await document.GetSyntaxRootAsync(cancellationToken);
-            docNode = docNode.ReplaceNode(classParent, newClass);
-
-            docNode = Formatter.Format(docNode, solution.Workspace);
-            var resultSolution = solution.WithDocumentSyntaxRoot(document.Id, docNode);
-
-            return resultSolution;
-        }
-    }
-}
\ No newline at end of file

From f6c80727112f74423c60bfb0e9edc29d6ba51952 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Sun, 10 Feb 2019 13:45:59 +0100
Subject: [PATCH 18/25] fix Signum.Analyzer.Tests

---
 .../ExpressionFieldTest.cs                    | 95 ++++++++++---------
 .../Helpers/CodeFixVerifier.Helper.cs         |  6 +-
 .../Helpers/DiagnosticVerifier.Helper.cs      | 36 +++++--
 .../Signum.Analyzer.Test/LiteCastTest.cs      | 10 +-
 .../Signum.Analyzer.Test/LiteEqualiyTest.cs   | 19 ++--
 .../Signum.Analyzer.Test.csproj               |  9 +-
 .../Verifiers/CodeFixVerifier.cs              | 24 ++---
 .../Verifiers/DiagnosticVerifier.cs           | 37 ++------
 .../ExpressionFieldAnalyzer.cs                | 13 ++-
 .../Signum.Analyzer/LiteEqualityAnalyzer.cs   |  8 +-
 10 files changed, 125 insertions(+), 132 deletions(-)

diff --git a/Signum.Analyzer/Signum.Analyzer.Test/ExpressionFieldTest.cs b/Signum.Analyzer/Signum.Analyzer.Test/ExpressionFieldTest.cs
index b43b55df9e..2df3e414e0 100644
--- a/Signum.Analyzer/Signum.Analyzer.Test/ExpressionFieldTest.cs
+++ b/Signum.Analyzer/Signum.Analyzer.Test/ExpressionFieldTest.cs
@@ -1,4 +1,4 @@
-using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CodeFixes;
 using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
@@ -63,7 +63,7 @@ public void ExpressionNoReturn()
         public static int OperationLogs(this Entity e)
         {
             var a = 2;
-        }");
+        }", assertErrors: false);
         }
 
         [TestMethod]
@@ -74,7 +74,7 @@ public void ExpressionNoReturnExpression()
         public static int OperationLogs(this Entity e)
         {
             return;
-        }");
+        }", assertErrors: false);
         }
 
         [TestMethod]
@@ -82,7 +82,7 @@ public void ExpressionNoGetter()
         {
             TestDiagnostic("no getter", @"        
         [ExpressionField]
-        public static int OperationLogs { set; }");
+        public static int OperationLogs { set; }", assertErrors: false);
         }
 
         [TestMethod]
@@ -98,7 +98,7 @@ public void ExpressionMethodExpressionBody()
         {
             TestDiagnostic("no invocation", @"        
         [ExpressionField]
-        public static int OperationLogs => 1");
+        public static int OperationLogs => 1;");
         }
 
         [TestMethod]
@@ -106,7 +106,7 @@ public void ExpressionGetterExpressionBody()
         {
             TestDiagnostic("no invocation", @"        
         [ExpressionField]
-        public static int OperationLogs(this Entity e) => 1");
+        public static int OperationLogs(this Entity e) => 1;");
         }
 
         [TestMethod]
@@ -115,7 +115,7 @@ public void ExpressionNoEvaluate()
             TestDiagnostic("no Evaluate", @"
         static Expression<Func<Entity, int>> MyExpression;         
         [ExpressionField]
-        public static int OperationLogs(this Entity e) => MyExpression.Invoke(e)");
+        public static int OperationLogs(this Entity e) => MyExpression.Invoke(e)", assertErrors: false);
         }
 
         [TestMethod]
@@ -124,7 +124,7 @@ public void ExpressionNoStaticField()
             TestDiagnostic("no static field", @"
         static Expression<Func<Entity, int>> MyExpression { get; }         
         [ExpressionField]
-        public static int OperationLogs(this Entity e) => MyExpression.Evaluate(e)");
+        public static int OperationLogs(this Entity e) => MyExpression.Evaluate(e)", assertErrors: false);
         }
 
         [TestMethod]
@@ -133,25 +133,25 @@ public void ExpressionThis()
             TestDiagnostic("first argument should be 'this'", @"
         static Expression<Func<Entity, int>> MyExpression;        
         [ExpressionField]
-        public int OperationLogs(this Entity e) => MyExpression.Evaluate(e)");
+        public int OperationLogs(this Entity e) => MyExpression.Evaluate(e)", assertErrors: false);
         }
 
         [TestMethod]
         public void ExpressionMissingArgument()
         {
             TestDiagnostic("missing argument 'e'", @"
-        static Expression<Func<Bla, int>> MyExpression;        
+        static Expression<Func<int>> MyExpression;        
         [ExpressionField]
-        public int OperationLogs(this Entity e) => MyExpression.Evaluate(this)");
+        public static int OperationLogs(this Entity e) => MyExpression.Evaluate();", includeExpression: true);
         }
 
         [TestMethod]
         public void ExpressionExtra()
         {
             TestDiagnostic("extra parameters", @"
-        static Expression<Func<Bla, Entity, Entity, int>> MyExpression;        
+        static Expression<Func<Entity, Entity, int>> MyExpression;        
         [ExpressionField]
-        public int OperationLogs(this Entity e) => MyExpression.Evaluate(this, e, e)");
+        public static int OperationLogs(this Entity e) => MyExpression.Evaluate(e, e);", assertErrors: false);
         }
 
         [TestMethod]
@@ -160,44 +160,44 @@ public void ExpressionCorrect()
             TestDiagnostic(null, @"
         static Expression<Func<Bla, Entity, int>> MyExpression;        
         [ExpressionField]
-        public int OperationLogs(this Entity e) => MyExpression.Evaluate(this, e)");
+        public int OperationLogs(Entity e) => MyExpression.Evaluate(this, e);", staticClass: false, includeExpression: true);
         }
 
         [TestMethod]
         public void ExpressionExplicitNotFound()
         {
             TestDiagnostic("field 'MyExpression' not found", @"
-        static Expression<Func<Bla, Entity, int>> MyExpressionBad;        
+        static Expression<Func<Entity, int>> MyExpressionBad;        
         [ExpressionField(""MyExpression"")]
-        public int OperationLogs(this Entity e) => 0");
+        public static int OperationLogs(this Entity e) => 0;", assertErrors: false);
         }
 
         [TestMethod]
         public void ExpressionExplicitWrongType()
         {
-            TestDiagnostic("type of 'MyExpression' should be 'Expression<Func<Bla, Entity, int>>'", @"
-        static Expression<Func<Entity, int>> MyExpression;        
+            TestDiagnostic("type of 'MyExpression' should be 'Expression<Func<Entity, int>>'", @"
+        static Expression<Func<Entity, long, int>> MyExpression;        
         [ExpressionField(""MyExpression"")]
-        public int OperationLogs(this Entity e) => 0", withIncludes: true);
+        public static int OperationLogs(this Entity e) => 0;", includeExpression: true);
         }
 
         [TestMethod]
         public void ExpressionExplicitCorrect()
         {
             TestDiagnostic(null, @"
-        static Expression<Func<Bla, Entity, int>> MyExpression;        
+        static Expression<Func<Entity, int>> MyExpression;        
         [ExpressionField(""MyExpression"")]
-        public int OperationLogs(this Entity e) => 0", withIncludes: true);
+        public static int OperationLogs(this Entity e) => 0;", includeExpression: true);
         }
 
 
-        private void TestDiagnostic(string expectedError, string code, bool withIncludes = false)
+        private void TestDiagnostic(string expectedError, string code, bool includeExpression = false, bool staticClass = true, bool assertErrors = true)
         {
-            string test = Surround(code, withIncludes: withIncludes);
+            string test = Surround(code, includeExpression, staticClass);
             if (expectedError == null)
-                VerifyCSharpDiagnostic(test, new DiagnosticResult[0]);
+                VerifyCSharpDiagnostic(test, assertErrors, new DiagnosticResult[0]);
             else
-                VerifyCSharpDiagnostic(test, new DiagnosticResult
+                VerifyCSharpDiagnostic(test, assertErrors, new DiagnosticResult
                 {
                     Id = ExpressionFieldAnalyzer.DiagnosticId,
                     Message = string.Format("'OperationLogs' should reference an static field of type Expression<T> with the same signature ({0})", expectedError),
@@ -205,9 +205,9 @@ private void TestDiagnostic(string expectedError, string code, bool withIncludes
                 });
         }
 
-        private static string Surround(string expression, bool withIncludes = false)
+        private static string Surround(string member, bool includeExpression = false, bool staticClass = true)
         {
-            return @"
+            return $@"
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -216,17 +216,17 @@ private static string Surround(string expression, bool withIncludes = false)
 using System.Diagnostics;
 using Signum.Entities;
 using Signum.Utilities;
-using Signum.Utilities.ExpressionTrees;" + (withIncludes ? @"
-using System.Linq.Expressions;" : null) +  @"
+using Signum.Utilities.ExpressionTrees;
+{(includeExpression ? @"using System.Linq.Expressions;
+" : null)}
 
 namespace ConsoleApplication1
-{
-    class Bla
-    {"
-+ expression +
-@"
-    }
-}";
+{{
+    {(staticClass ? "static" : null)} class Bla
+    {{
+{member}
+    }}
+}}";
         }
 
         [TestMethod]
@@ -252,23 +252,23 @@ public void ExpressionFixInstanceProperty()
 
         static Expression<Func<Bla, string>> GetIdExpression = @this => @this.ToString();
         [ExpressionField]
-        public string GetId => GetIdExpression.Evaluate(this);");
+        public string GetId => GetIdExpression.Evaluate(this);", staticClass: false);
         }
 
         [TestMethod]
         public void ExpressionFixInstancePropertyImplicitThis()
         {
             TestCodeFix(@"
-        string id;
+        string? id;
 
         [ExpressionField]
-        public string GetId => id;",
+        public string? GetId => id;",
         @"
-        string id;
+        string? id;
 
-        static Expression<Func<Bla, string>> GetIdExpression = @this => @this.id;
+        static Expression<Func<Bla, string? >> GetIdExpression = @this => @this.id;
         [ExpressionField]
-        public string GetId => GetIdExpression.Evaluate(this);");
+        public string? GetId => GetIdExpression.Evaluate(this);", staticClass: false);
         }
 
         [TestMethod]
@@ -282,7 +282,7 @@ public void ExpressionFixInstancePropertyStatementImplicitThis()
 
         static Expression<Func<Bla, string>> GetIdExpression = @this => @this.ToString();
         [ExpressionField]
-        public string GetId { get { return GetIdExpression.Evaluate(this); } }");
+        public string GetId { get { return GetIdExpression.Evaluate(this); } }", staticClass: false);
         }
         
 
@@ -302,9 +302,12 @@ public void ExpressionFixDiagnosticStatic2()
         public static int GetId(Entity e) => GetIdExpression2.Evaluate(e);");
         }
 
-        private void TestCodeFix(string initial, string final)
+        private void TestCodeFix(string initial, string final, bool staticClass = true)
         {
-            VerifyCSharpFix(Surround(initial), Surround(final, withIncludes:true));
+            VerifyCSharpFix(
+                Surround(initial, includeExpression: false, staticClass: staticClass),
+                Surround(final, includeExpression: true, staticClass: staticClass),
+            assertNoInitialErrors: false);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Analyzer/Signum.Analyzer.Test/Helpers/CodeFixVerifier.Helper.cs b/Signum.Analyzer/Signum.Analyzer.Test/Helpers/CodeFixVerifier.Helper.cs
index c88cd4e68c..2acd1ebe4b 100644
--- a/Signum.Analyzer/Signum.Analyzer.Test/Helpers/CodeFixVerifier.Helper.cs
+++ b/Signum.Analyzer/Signum.Analyzer.Test/Helpers/CodeFixVerifier.Helper.cs
@@ -33,12 +33,12 @@ private static Document ApplyFix(Document document, CodeAction codeAction)
         /// Note: Considers Diagnostics to be the same if they have the same Ids.  In the case of multiple diagnostics with the same Id in a row,
         /// this method may not necessarily return the new one.
         /// </summary>
-        /// <param name="diagnostics">The Diagnostics that existed in the code before the CodeFix was applied</param>
+        /// <param name="oldDiagnostics">The Diagnostics that existed in the code before the CodeFix was applied</param>
         /// <param name="newDiagnostics">The Diagnostics that exist in the code after the CodeFix was applied</param>
         /// <returns>A list of Diagnostics that only surfaced in the code after the CodeFix was applied</returns>
-        private static IEnumerable<Diagnostic> GetNewDiagnostics(IEnumerable<Diagnostic> diagnostics, IEnumerable<Diagnostic> newDiagnostics)
+        private static IEnumerable<Diagnostic> GetNewDiagnostics(IEnumerable<Diagnostic> oldDiagnostics, IEnumerable<Diagnostic> newDiagnostics)
         {
-            var oldArray = diagnostics.OrderBy(d => d.Location.SourceSpan.Start).ToArray();
+            var oldArray = oldDiagnostics.OrderBy(d => d.Location.SourceSpan.Start).ToArray();
             var newArray = newDiagnostics.OrderBy(d => d.Location.SourceSpan.Start).ToArray();
 
             int oldIndex = 0;
diff --git a/Signum.Analyzer/Signum.Analyzer.Test/Helpers/DiagnosticVerifier.Helper.cs b/Signum.Analyzer/Signum.Analyzer.Test/Helpers/DiagnosticVerifier.Helper.cs
index 993c7c69e2..270a90b637 100644
--- a/Signum.Analyzer/Signum.Analyzer.Test/Helpers/DiagnosticVerifier.Helper.cs
+++ b/Signum.Analyzer/Signum.Analyzer.Test/Helpers/DiagnosticVerifier.Helper.cs
@@ -8,6 +8,8 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
+using System.ComponentModel;
+using System.IO;
 using System.Linq;
 using System.Linq.Expressions;
 
@@ -24,8 +26,14 @@ public abstract partial class DiagnosticVerifier
         private static readonly MetadataReference CSharpSymbolsReference = MetadataReference.CreateFromFile(typeof(CSharpCompilation).Assembly.Location);
         private static readonly MetadataReference CodeAnalysisReference = MetadataReference.CreateFromFile(typeof(Compilation).Assembly.Location);
         private static readonly MetadataReference SystemLinqExpression = MetadataReference.CreateFromFile(typeof(Expression).Assembly.Location);
-        private static readonly MetadataReference SystemRuntimeReference= MetadataReference.CreateFromFile(@"C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.netcore.app\2.1.0\ref\netcoreapp2.1\System.Runtime.dll"/*typeof(ValueType).Assembly.Location*/);
+
+
+
+        private static readonly MetadataReference SystemPrivateCorLib = MetadataReference.CreateFromFile(typeof(Func<>).Assembly.Location);
+        private static readonly MetadataReference SystemRuntimeReference = MetadataReference.CreateFromFile(Path.Combine(Path.GetDirectoryName(typeof(Func<>).Assembly.Location), "System.Runtime.dll"));
         private static readonly MetadataReference SystemRuntime = MetadataReference.CreateFromFile(typeof(DateTime).Assembly.Location);
+        private static readonly MetadataReference SystemObjectModel = MetadataReference.CreateFromFile(typeof(INotifyPropertyChanged).Assembly.Location);
+        private static readonly MetadataReference SystemComponentModelTypeConverter = MetadataReference.CreateFromFile(typeof(IDataErrorInfo).Assembly.Location);
         private static readonly MetadataReference SignumUtilitiesReference = MetadataReference.CreateFromFile(typeof(Csv).Assembly.Location);
         private static readonly MetadataReference SignumEntitiesReference = MetadataReference.CreateFromFile(typeof(Entity).Assembly.Location);
         private static readonly MetadataReference SignumEngineReference = MetadataReference.CreateFromFile(typeof(Database).Assembly.Location);
@@ -44,9 +52,10 @@ public abstract partial class DiagnosticVerifier
         /// <param name="language">The language the source classes are in</param>
         /// <param name="analyzer">The analyzer to be run on the sources</param>
         /// <returns>An IEnumerable of Diagnostics that surfaced in the source code, sorted by Location</returns>
-        private static Diagnostic[] GetSortedDiagnostics(string[] sources, string language, DiagnosticAnalyzer analyzer)
+        private static Diagnostic[] GetSortedDiagnostics(string[] sources, string language, bool assertErrors, DiagnosticAnalyzer analyzer)
         {
-            return GetSortedDiagnosticsFromDocuments(analyzer, GetDocuments(sources, language));
+            var docs = GetDocuments(sources, language);
+            return GetSortedDiagnosticsFromDocuments(analyzer, assertErrors, docs);
         }
 
         /// <summary>
@@ -56,7 +65,7 @@ private static Diagnostic[] GetSortedDiagnostics(string[] sources, string langua
         /// <param name="analyzer">The analyzer to run on the documents</param>
         /// <param name="documents">The Documents that the analyzer will be run on</param>
         /// <returns>An IEnumerable of Diagnostics that surfaced in the source code, sorted by Location</returns>
-        protected static Diagnostic[] GetSortedDiagnosticsFromDocuments(DiagnosticAnalyzer analyzer, Document[] documents)
+        protected static Diagnostic[] GetSortedDiagnosticsFromDocuments(DiagnosticAnalyzer analyzer, bool assertErrors, Document[] documents)
         {
             var projects = new HashSet<Project>();
             foreach (var document in documents)
@@ -67,7 +76,15 @@ protected static Diagnostic[] GetSortedDiagnosticsFromDocuments(DiagnosticAnalyz
             var diagnostics = new List<Diagnostic>();
             foreach (var project in projects)
             {
-                var compilationWithAnalyzers = project.GetCompilationAsync().Result.WithAnalyzers(ImmutableArray.Create(analyzer));
+                var compilation = project.GetCompilationAsync().Result;
+                if (assertErrors)
+                {
+                    var errors = compilation.GetDiagnostics();
+                    if (errors.Any(a => a.Severity == DiagnosticSeverity.Error))
+                        throw new InvalidOperationException("Errors found:\n" + errors.Where(a => a.Severity == DiagnosticSeverity.Error).ToString("\n").Indent(2));
+                }   
+
+                var compilationWithAnalyzers = compilation.WithAnalyzers(ImmutableArray.Create(analyzer));
                 var diags = compilationWithAnalyzers.GetAnalyzerDiagnosticsAsync().Result;
                 foreach (var diag in diags)
                 {
@@ -116,7 +133,7 @@ private static Diagnostic[] SortDiagnostics(IEnumerable<Diagnostic> diagnostics)
         /// <returns>A Tuple containing the Documents produced from the sources and their TextSpans if relevant</returns>
         private static Document[] GetDocuments(string[] sources, string language)
         {
-            if (language != LanguageNames.CSharp && language != LanguageNames.VisualBasic)
+            if (language != LanguageNames.CSharp)
             {
                 throw new ArgumentException("Unsupported Language");
             }
@@ -158,14 +175,19 @@ private static Project CreateProject(string[] sources, string language = Languag
 
             var solution = new AdhocWorkspace()
                 .CurrentSolution
-                .AddProject(projectId, TestProjectName, TestProjectName, language)
+                .AddProject( projectId, TestProjectName, TestProjectName, language)
+                .WithProjectParseOptions(projectId, new CSharpParseOptions(LanguageVersion.CSharp8))
+                .WithProjectCompilationOptions(projectId, new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary).WithNullableContextOptions(NullableContextOptions.Enable))
                 .AddMetadataReference(projectId, CorlibReference)
                 .AddMetadataReference(projectId, SystemCoreReference)
                 .AddMetadataReference(projectId, CSharpSymbolsReference)
                 .AddMetadataReference(projectId, CodeAnalysisReference)
+                .AddMetadataReference(projectId, SystemPrivateCorLib)
                 .AddMetadataReference(projectId, SystemRuntimeReference)
                 .AddMetadataReference(projectId, SystemLinqExpression)
                 .AddMetadataReference(projectId, SystemRuntime)
+                .AddMetadataReference(projectId, SystemObjectModel)
+                .AddMetadataReference(projectId, SystemComponentModelTypeConverter)
                 .AddMetadataReference(projectId, SignumUtilitiesReference)
                 .AddMetadataReference(projectId, SignumEntitiesReference)
                 .AddMetadataReference(projectId, SignumEngineReference);
diff --git a/Signum.Analyzer/Signum.Analyzer.Test/LiteCastTest.cs b/Signum.Analyzer/Signum.Analyzer.Test/LiteCastTest.cs
index 459f59b107..325c926512 100644
--- a/Signum.Analyzer/Signum.Analyzer.Test/LiteCastTest.cs
+++ b/Signum.Analyzer/Signum.Analyzer.Test/LiteCastTest.cs
@@ -1,4 +1,4 @@
-using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CodeFixes;
 using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
@@ -74,13 +74,13 @@ public void IsToLite()
             ");
         }
 
-        private void TestDiagnostic(string expectedError, string code, bool withIncludes = false)
+        private void TestDiagnostic(string expectedError, string code, bool withIncludes = false, bool assertNoErrors = true)
         {
             string test = Surround(code, withIncludes: withIncludes);
             if (expectedError == null)
-                VerifyCSharpDiagnostic(test, new DiagnosticResult[0]);
+                VerifyCSharpDiagnostic(test, assertNoErrors, new DiagnosticResult[0]);
             else
-                VerifyCSharpDiagnostic(test, new DiagnosticResult
+                VerifyCSharpDiagnostic(test, assertNoErrors, new DiagnosticResult
                 {
                     Id = LiteCastAnalyzer.DiagnosticId,
                     Message = expectedError,
@@ -115,4 +115,4 @@ void Foo()
 }";
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Analyzer/Signum.Analyzer.Test/LiteEqualiyTest.cs b/Signum.Analyzer/Signum.Analyzer.Test/LiteEqualiyTest.cs
index fefb9b8d91..135dc727c2 100644
--- a/Signum.Analyzer/Signum.Analyzer.Test/LiteEqualiyTest.cs
+++ b/Signum.Analyzer/Signum.Analyzer.Test/LiteEqualiyTest.cs
@@ -1,4 +1,4 @@
-using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CodeFixes;
 using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
@@ -30,7 +30,6 @@ public void CompareLiteAndEntity()
         [TestMethod]
         public void CompareIncompatibleTypes()
         {
-         
             TestDiagnostic("Impossible to compare Lite<AppleEntity> and Lite<OrangeEntity>", @"
 Lite<AppleEntity> apple = null;
 Lite<OrangeEntity> orange = null;
@@ -41,7 +40,6 @@ public void CompareIncompatibleTypes()
         [TestMethod]
         public void CompareIncompatibleAbstractTypes()
         {
-
             TestDiagnostic("Impossible to compare Lite<AbstractBananaEntity> and Lite<OrangeEntity>", @"
 Lite<AbstractBananaEntity> banana = null;
 Lite<OrangeEntity> orange = null;
@@ -55,7 +53,7 @@ public void CompareBaseType()
 
             TestDiagnostic(null, @"
 Lite<Entity> type = null;
-Lite<QueryEntity> query = null;
+Lite<OrangeEntity> query = null;
 var condition = type == query;       
             ");
         }
@@ -81,16 +79,13 @@ public void CompareDifferentInterfaceEntity()
             ");
         }
 
-
-
-
-        private void TestDiagnostic(string expectedError, string code, bool withIncludes = false)
+        private void TestDiagnostic(string expectedError, string code,  bool withIncludes = false, bool assertErrors = true)
         {
             string test = Surround(code, withIncludes: withIncludes);
             if (expectedError == null)
-                VerifyCSharpDiagnostic(test, new DiagnosticResult[0]);
+                VerifyCSharpDiagnostic(test, assertErrors, new DiagnosticResult[0]);
             else
-                VerifyCSharpDiagnostic(test, new DiagnosticResult
+                VerifyCSharpDiagnostic(test, assertErrors, new DiagnosticResult
                 {
                     Id = LiteEqualityAnalyzer.DiagnosticId,
                     Message = expectedError,
@@ -119,7 +114,7 @@ public interface IMan : IEntity {}
     public class AppleEntity : Entity {}
     public class OrangeEntity : Entity {}
 
-    public abstracr class AbstractBananaEntity : Entity {}
+    public abstract class AbstractBananaEntity : Entity {}
 
     class Bla
     {  
@@ -132,4 +127,4 @@ void Foo()
 }";
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Signum.Analyzer/Signum.Analyzer.Test/Signum.Analyzer.Test.csproj b/Signum.Analyzer/Signum.Analyzer.Test/Signum.Analyzer.Test.csproj
index 8055f444cf..8d0a2e7b6f 100644
--- a/Signum.Analyzer/Signum.Analyzer.Test/Signum.Analyzer.Test.csproj
+++ b/Signum.Analyzer/Signum.Analyzer.Test/Signum.Analyzer.Test.csproj
@@ -1,15 +1,18 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
+    <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
+
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="2.6.2">
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="2.6.3">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="2.10.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.1.0-beta1-19102-01" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.1.0-beta1-19102-01" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="1.4.0" />
     <PackageReference Include="MSTest.TestFramework" Version="1.4.0" />
diff --git a/Signum.Analyzer/Signum.Analyzer.Test/Verifiers/CodeFixVerifier.cs b/Signum.Analyzer/Signum.Analyzer.Test/Verifiers/CodeFixVerifier.cs
index ececdea522..c40a0f70f5 100644
--- a/Signum.Analyzer/Signum.Analyzer.Test/Verifiers/CodeFixVerifier.cs
+++ b/Signum.Analyzer/Signum.Analyzer.Test/Verifiers/CodeFixVerifier.cs
@@ -41,23 +41,11 @@ protected virtual CodeFixProvider GetBasicCodeFixProvider()
         /// <param name="newSource">A class in the form of a string after the CodeFix was applied to it</param>
         /// <param name="codeFixIndex">Index determining which codefix to apply if there are multiple</param>
         /// <param name="allowNewCompilerDiagnostics">A bool controlling whether or not the test will fail if the CodeFix introduces other warnings after being applied</param>
-        protected void VerifyCSharpFix(string oldSource, string newSource, int? codeFixIndex = null, bool allowNewCompilerDiagnostics = false)
+        protected void VerifyCSharpFix(string oldSource, string newSource, int? codeFixIndex = null, bool assertNoInitialErrors = true, bool allowNewCompilerDiagnostics = false)
         {
-            VerifyFix(LanguageNames.CSharp, GetCSharpDiagnosticAnalyzer(), GetCSharpCodeFixProvider(), oldSource, newSource, codeFixIndex, allowNewCompilerDiagnostics);
+            VerifyFix(LanguageNames.CSharp, GetCSharpDiagnosticAnalyzer(), GetCSharpCodeFixProvider(), oldSource, newSource, codeFixIndex, assertNoInitialErrors, allowNewCompilerDiagnostics);
         }
-
-        /// <summary>
-        /// Called to test a VB codefix when applied on the inputted string as a source
-        /// </summary>
-        /// <param name="oldSource">A class in the form of a string before the CodeFix was applied to it</param>
-        /// <param name="newSource">A class in the form of a string after the CodeFix was applied to it</param>
-        /// <param name="codeFixIndex">Index determining which codefix to apply if there are multiple</param>
-        /// <param name="allowNewCompilerDiagnostics">A bool controlling whether or not the test will fail if the CodeFix introduces other warnings after being applied</param>
-        protected void VerifyBasicFix(string oldSource, string newSource, int? codeFixIndex = null, bool allowNewCompilerDiagnostics = false)
-        {
-            VerifyFix(LanguageNames.VisualBasic, GetBasicDiagnosticAnalyzer(), GetBasicCodeFixProvider(), oldSource, newSource, codeFixIndex, allowNewCompilerDiagnostics);
-        }
-
+        
         /// <summary>
         /// General verifier for codefixes.
         /// Creates a Document from the source string, then gets diagnostics on it and applies the relevant codefixes.
@@ -71,10 +59,10 @@ protected void VerifyBasicFix(string oldSource, string newSource, int? codeFixIn
         /// <param name="newSource">A class in the form of a string after the CodeFix was applied to it</param>
         /// <param name="codeFixIndex">Index determining which codefix to apply if there are multiple</param>
         /// <param name="allowNewCompilerDiagnostics">A bool controlling whether or not the test will fail if the CodeFix introduces other warnings after being applied</param>
-        private void VerifyFix(string language, DiagnosticAnalyzer analyzer, CodeFixProvider codeFixProvider, string oldSource, string newSource, int? codeFixIndex, bool allowNewCompilerDiagnostics)
+        private void VerifyFix(string language, DiagnosticAnalyzer analyzer, CodeFixProvider codeFixProvider, string oldSource, string newSource, int? codeFixIndex, bool assertNoInitialErrors, bool allowNewCompilerDiagnostics)
         {
             var document = CreateDocument(oldSource, language);
-            var analyzerDiagnostics = GetSortedDiagnosticsFromDocuments(analyzer, new[] { document });
+            var analyzerDiagnostics = GetSortedDiagnosticsFromDocuments(analyzer, assertNoInitialErrors, new[] { document });
             var compilerDiagnostics = GetCompilerDiagnostics(document);
             var attempts = analyzerDiagnostics.Length;
 
@@ -96,7 +84,7 @@ private void VerifyFix(string language, DiagnosticAnalyzer analyzer, CodeFixProv
                 }
 
                 document = ApplyFix(document, actions.ElementAt(0));
-                analyzerDiagnostics = GetSortedDiagnosticsFromDocuments(analyzer, new[] { document });
+                analyzerDiagnostics = GetSortedDiagnosticsFromDocuments(analyzer, false , new[] { document });
 
                 var newCompilerDiagnostics = GetNewDiagnostics(compilerDiagnostics, GetCompilerDiagnostics(document));
 
diff --git a/Signum.Analyzer/Signum.Analyzer.Test/Verifiers/DiagnosticVerifier.cs b/Signum.Analyzer/Signum.Analyzer.Test/Verifiers/DiagnosticVerifier.cs
index 515da767aa..918b7bc11a 100644
--- a/Signum.Analyzer/Signum.Analyzer.Test/Verifiers/DiagnosticVerifier.cs
+++ b/Signum.Analyzer/Signum.Analyzer.Test/Verifiers/DiagnosticVerifier.cs
@@ -39,21 +39,11 @@ protected virtual DiagnosticAnalyzer GetBasicDiagnosticAnalyzer()
         /// </summary>
         /// <param name="source">A class in the form of a string to run the analyzer on</param>
         /// <param name="expected"> DiagnosticResults that should appear after the analyzer is run on the source</param>
-        protected void VerifyCSharpDiagnostic(string source, params DiagnosticResult[] expected)
+        protected void VerifyCSharpDiagnostic(string source, bool assertErrors, params DiagnosticResult[] expected)
         {
-            VerifyDiagnostics(new[] { source }, LanguageNames.CSharp, GetCSharpDiagnosticAnalyzer(), expected);
-        }
-
-        /// <summary>
-        /// Called to test a VB DiagnosticAnalyzer when applied on the single inputted string as a source
-        /// Note: input a DiagnosticResult for each Diagnostic expected
-        /// </summary>
-        /// <param name="source">A class in the form of a string to run the analyzer on</param>
-        /// <param name="expected">DiagnosticResults that should appear after the analyzer is run on the source</param>
-        protected void VerifyBasicDiagnostic(string source, params DiagnosticResult[] expected)
-        {
-            VerifyDiagnostics(new[] { source }, LanguageNames.VisualBasic, GetBasicDiagnosticAnalyzer(), expected);
+            VerifyDiagnostics(new[] { source }, LanguageNames.CSharp, assertErrors, GetCSharpDiagnosticAnalyzer(), expected);
         }
+        
 
         /// <summary>
         /// Called to test a C# DiagnosticAnalyzer when applied on the inputted strings as a source
@@ -61,22 +51,11 @@ protected void VerifyBasicDiagnostic(string source, params DiagnosticResult[] ex
         /// </summary>
         /// <param name="sources">An array of strings to create source documents from to run the analyzers on</param>
         /// <param name="expected">DiagnosticResults that should appear after the analyzer is run on the sources</param>
-        protected void VerifyCSharpDiagnostic(string[] sources, params DiagnosticResult[] expected)
-        {
-            VerifyDiagnostics(sources, LanguageNames.CSharp, GetCSharpDiagnosticAnalyzer(), expected);
-        }
-
-        /// <summary>
-        /// Called to test a VB DiagnosticAnalyzer when applied on the inputted strings as a source
-        /// Note: input a DiagnosticResult for each Diagnostic expected
-        /// </summary>
-        /// <param name="sources">An array of strings to create source documents from to run the analyzers on</param>
-        /// <param name="expected">DiagnosticResults that should appear after the analyzer is run on the sources</param>
-        protected void VerifyBasicDiagnostic(string[] sources, params DiagnosticResult[] expected)
+        protected void VerifyCSharpDiagnostic(string[] sources, bool assertNoErrors, params DiagnosticResult[] expected)
         {
-            VerifyDiagnostics(sources, LanguageNames.VisualBasic, GetBasicDiagnosticAnalyzer(), expected);
+            VerifyDiagnostics(sources, LanguageNames.CSharp, assertNoErrors, GetCSharpDiagnosticAnalyzer(), expected);
         }
-
+        
         /// <summary>
         /// General method that gets a collection of actual diagnostics found in the source after the analyzer is run, 
         /// then verifies each of them.
@@ -85,9 +64,9 @@ protected void VerifyBasicDiagnostic(string[] sources, params DiagnosticResult[]
         /// <param name="language">The language of the classes represented by the source strings</param>
         /// <param name="analyzer">The analyzer to be run on the source code</param>
         /// <param name="expected">DiagnosticResults that should appear after the analyzer is run on the sources</param>
-        private void VerifyDiagnostics(string[] sources, string language, DiagnosticAnalyzer analyzer, params DiagnosticResult[] expected)
+        private void VerifyDiagnostics(string[] sources, string language, bool assertErrors, DiagnosticAnalyzer analyzer, params DiagnosticResult[] expected)
         {
-            var diagnostics = GetSortedDiagnostics(sources, language, analyzer);
+            var diagnostics = GetSortedDiagnostics(sources, language, assertErrors, analyzer);
             VerifyDiagnosticResults(diagnostics, analyzer, expected);
         }
 
diff --git a/Signum.Analyzer/Signum.Analyzer/ExpressionFieldAnalyzer.cs b/Signum.Analyzer/Signum.Analyzer/ExpressionFieldAnalyzer.cs
index c439b45d90..bf42bec443 100644
--- a/Signum.Analyzer/Signum.Analyzer/ExpressionFieldAnalyzer.cs
+++ b/Signum.Analyzer/Signum.Analyzer/ExpressionFieldAnalyzer.cs
@@ -26,11 +26,11 @@ public class ExpressionFieldAnalyzer : DiagnosticAnalyzer
 
         public override void Initialize(AnalysisContext context)
         {
-            context.RegisterSyntaxNodeAction(AnalyzePropertySymbol, SyntaxKind.Attribute);
+            context.RegisterSyntaxNodeAction(AnalyzeAttributeSymbol, SyntaxKind.Attribute);
         }
 
 
-        static void AnalyzePropertySymbol(SyntaxNodeAnalysisContext context)
+        static void AnalyzeAttributeSymbol(SyntaxNodeAnalysisContext context)
         {
             try
             {
@@ -92,9 +92,12 @@ static void AnalyzePropertySymbol(SyntaxNodeAnalysisContext context)
 
                     if (!expressionType.Equals(fieldSymbol.Type))
                     {
-                        var minimalParts = expressionType.ToMinimalDisplayString(context.SemanticModel, member.GetLocation().SourceSpan.Start);
-                        Diagnostic(context, ident, att.GetLocation(), string.Format("type of '{0}' should be '{1}'", fieldName, minimalParts));
-                        return;
+                        //if (!expressionType.ToString().Equals(fieldSymbol.Type.ToString())) // Till there is an API to express nullability
+                        {
+                            var minimalParts = expressionType.ToMinimalDisplayString(context.SemanticModel, member.GetLocation().SourceSpan.Start);
+                            Diagnostic(context, ident, att.GetLocation(), string.Format("type of '{0}' should be '{1}'", fieldName, minimalParts));
+                            return;
+                        }
                     }
                 }
                 else
diff --git a/Signum.Analyzer/Signum.Analyzer/LiteEqualityAnalyzer.cs b/Signum.Analyzer/Signum.Analyzer/LiteEqualityAnalyzer.cs
index c627b6f347..c2fe501356 100644
--- a/Signum.Analyzer/Signum.Analyzer/LiteEqualityAnalyzer.cs
+++ b/Signum.Analyzer/Signum.Analyzer/LiteEqualityAnalyzer.cs
@@ -1,4 +1,4 @@
-using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Diagnostics;
@@ -18,7 +18,7 @@ public class LiteEqualityAnalyzer : DiagnosticAnalyzer
         
         private static DiagnosticDescriptor RuleLiteEntity = new DiagnosticDescriptor(DiagnosticId,
             "Prevents comparisons between Lite<T> and T",
-            "Impossible to compare Lite<T> and T. Consider using RefersTo method", "Lite",
+            "Impossible to compare Lite<T> and T. Consider using 'Is' extension method", "Lite",
             DiagnosticSeverity.Error,
             isEnabledByDefault: true,
             description: "Checks that Lite<T> and T are not compared directly. C# doesn't catch this because Lite<T> is implemented as an interface to have co-variance");
@@ -61,8 +61,8 @@ private void AnalyzeNode(SyntaxNodeAnalysisContext context)
 
                 if (tLeft != null && 
                     tRight != null &&
-                    !tLeft.IsAbstract &&
-                    !tRight.IsAbstract &&
+                    tLeft.TypeKind != TypeKind.Interface &&
+                    tRight.TypeKind != TypeKind.Interface &&
                     !tLeft.GetBaseTypesAndThis().Contains(tRight) &&
                     !tRight.GetBaseTypesAndThis().Contains(tLeft))
                 {

From 9f87d04969d3c8e9ff6953da57a2825437551513 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Sun, 10 Feb 2019 13:46:58 +0100
Subject: [PATCH 19/25] update Analyzer but not working (waiting for
 https://github.com/dotnet/roslyn/issues/33078)

---
 Signum.Analyzer/Signum.Analyzer.sln             |  9 ++-------
 .../PublishProfiles/FolderProfile.pubxml        | 13 +++++++++++++
 .../Signum.Analyzer/Signum.Analyzer.csproj      | 17 +++++++++++------
 3 files changed, 26 insertions(+), 13 deletions(-)
 create mode 100644 Signum.Analyzer/Signum.Analyzer/Properties/PublishProfiles/FolderProfile.pubxml

diff --git a/Signum.Analyzer/Signum.Analyzer.sln b/Signum.Analyzer/Signum.Analyzer.sln
index 25588b883a..1647a07130 100644
--- a/Signum.Analyzer/Signum.Analyzer.sln
+++ b/Signum.Analyzer/Signum.Analyzer.sln
@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.28010.2041
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.28516.95
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.Engine", "..\Signum.Engine\Signum.Engine.csproj", "{7F2DB6FE-C109-4057-B207-C62A767F905D}"
 EndProject
@@ -9,8 +9,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.Entities", "..\Signu
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.Utilities", "..\Signum.Utilities\Signum.Utilities.csproj", "{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.MSBuildTask", "..\Signum.MSBuildTask\Signum.MSBuildTask.csproj", "{7B29A947-1044-4F86-8A76-E1D2D6371CF3}"
-EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.Analyzer", "Signum.Analyzer\Signum.Analyzer.csproj", "{C7E2DF3E-E66A-41E2-87E8-230F20CA533A}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Signum.Analyzer.Test", "Signum.Analyzer.Test\Signum.Analyzer.Test.csproj", "{AA518395-1E01-430A-9AC2-45CDB9476C8B}"
@@ -30,9 +28,6 @@ Global
 		{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}.Debug|Any CPU.ActiveCfg = Debug|x64
 		{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}.Debug|Any CPU.Build.0 = Debug|x64
 		{F7D3F72D-741D-4F67-8CF8-CD41B9035FED}.Release|Any CPU.ActiveCfg = Release|x64
-		{7B29A947-1044-4F86-8A76-E1D2D6371CF3}.Debug|Any CPU.ActiveCfg = Debug|x64
-		{7B29A947-1044-4F86-8A76-E1D2D6371CF3}.Debug|Any CPU.Build.0 = Debug|x64
-		{7B29A947-1044-4F86-8A76-E1D2D6371CF3}.Release|Any CPU.ActiveCfg = Release|x64
 		{C7E2DF3E-E66A-41E2-87E8-230F20CA533A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{C7E2DF3E-E66A-41E2-87E8-230F20CA533A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{C7E2DF3E-E66A-41E2-87E8-230F20CA533A}.Release|Any CPU.ActiveCfg = Release|Any CPU
diff --git a/Signum.Analyzer/Signum.Analyzer/Properties/PublishProfiles/FolderProfile.pubxml b/Signum.Analyzer/Signum.Analyzer/Properties/PublishProfiles/FolderProfile.pubxml
new file mode 100644
index 0000000000..fee35bb752
--- /dev/null
+++ b/Signum.Analyzer/Signum.Analyzer/Properties/PublishProfiles/FolderProfile.pubxml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+https://go.microsoft.com/fwlink/?LinkID=208121. 
+-->
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <PublishProtocol>FileSystem</PublishProtocol>
+    <Configuration>Release</Configuration>
+    <Platform>Any CPU</Platform>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <PublishDir>bin\Debug\netstandard2.0\publish\</PublishDir>
+  </PropertyGroup>
+</Project>
\ No newline at end of file
diff --git a/Signum.Analyzer/Signum.Analyzer/Signum.Analyzer.csproj b/Signum.Analyzer/Signum.Analyzer/Signum.Analyzer.csproj
index 9e73c31d03..88c07fb76c 100644
--- a/Signum.Analyzer/Signum.Analyzer/Signum.Analyzer.csproj
+++ b/Signum.Analyzer/Signum.Analyzer/Signum.Analyzer.csproj
@@ -1,14 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard1.3</TargetFramework>
+    <TargetFramework>netstandard2.0</TargetFramework>
     <IncludeBuildOutput>false</IncludeBuildOutput>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
   </PropertyGroup>
 
   <PropertyGroup>
     <PackageId>Signum.Analyzer</PackageId>
-    <PackageVersion>1.0.1</PackageVersion>
+    <PackageVersion>2.0.0-beta</PackageVersion>
     <Authors>Olmo del Corral</Authors>
     <PackageProjectUrl>http://www.signumframework.com</PackageProjectUrl>
     <RepositoryUrl>https://github.com/signumsoftware/framework</RepositoryUrl>
@@ -18,19 +18,24 @@
     <PackageTags>Signum.Analyzer, analyzers</PackageTags>
     <NoPackageAnalysis>true</NoPackageAnalysis>
     <PackageLicenseUrl>https://opensource.org/licenses/MIT</PackageLicenseUrl>
-    <Version>1.0.1</Version>
+    <Version>2.0.0-beta</Version>
     <PackageIconUrl>https://raw.githubusercontent.com/signumsoftware/framework/master/SignumLogo.png</PackageIconUrl>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="2.6.2" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="2.10.0" PrivateAssets="all" />
+    <Compile Remove="bin\**" />
+    <EmbeddedResource Remove="bin\**" />
+    <None Remove="bin\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="2.6.3" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.1.0-beta1-19102-01" PrivateAssets="all" />
     <PackageReference Update="NETStandard.Library" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>
     <None Update="tools\*.ps1" CopyToOutputDirectory="Always" Pack="true" PackagePath="" />
-    <None Include="$(OutputPath)\$(AssemblyName).dll" Pack="true" PackagePath="analyzers/dotnet/cs" Visible="false" />
   </ItemGroup>
 
 </Project>

From 2f5df3d2723146d828cfe04d7cc9a8d9f9612211 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Sun, 10 Feb 2019 13:47:18 +0100
Subject: [PATCH 20/25] more on nullability check

---
 Signum.Engine/Connection/SqlConnector.cs       |  2 +-
 Signum.Engine/Database.cs                      |  4 ++--
 .../DynamicQuery/DynamicQueryContainer.cs      |  2 +-
 Signum.Engine/Engine/Synchronizer.cs           |  4 ++--
 Signum.Engine/LinqExpandHints.cs               |  6 +++---
 Signum.Engine/Operations/OperationLogic.cs     |  2 +-
 Signum.Engine/Patterns/VirtualMList.cs         | 10 +++++-----
 Signum.Engine/Retriever.cs                     |  8 ++++----
 Signum.Engine/Schema/EntityEvents.cs           |  8 ++++----
 Signum.Engine/Schema/FluentInclude.cs          |  4 ++--
 Signum.Engine/Schema/Schema.cs                 | 12 +++++++-----
 .../Schema/SchemaBuilder/SchemaBuilder.cs      |  4 ++--
 .../SchemaBuilder/SchemaBuilderSettings.cs     |  6 +++---
 Signum.Engine/Schema/UniqueIndex.cs            |  4 +---
 Signum.Entities/Basics/OperationLog.cs         |  2 +-
 Signum.Entities/DynamicQuery/ResultTable.cs    | 18 +++++++++---------
 Signum.Entities/Lite.cs                        |  8 ++++----
 Signum.Entities/ModifiableEntity.cs            | 14 +++++++-------
 Signum.Entities/PropertyRoute.cs               |  4 ++--
 Signum.Entities/Symbol.md                      |  1 -
 Signum.Entities/ValidationAttributes.cs        |  4 ++--
 Signum.Entities/Validator.cs                   |  8 ++++----
 Signum.React/Signum.React.csproj               |  2 +-
 Signum.Test/Signum.Test.csproj                 |  2 +-
 Signum.Utilities/DescriptionManager.cs         |  2 +-
 Signum.Utilities/Disposable.cs                 |  2 +-
 .../Extensions/DictionaryExtensions.cs         | 11 ++++++++++-
 .../Extensions/EnumerableExtensions.cs         | 12 ++++++------
 Signum.Utilities/Extensions/Extensions.cs      |  2 +-
 .../Extensions/StringExtensions.cs             | 12 ++++++++++++
 Signum.Utilities/Reflection/ReflectionTools.cs |  6 +++---
 Signum.Utilities/SafeConsole.cs                | 14 +++++++-------
 32 files changed, 110 insertions(+), 90 deletions(-)

diff --git a/Signum.Engine/Connection/SqlConnector.cs b/Signum.Engine/Connection/SqlConnector.cs
index ecf73140f0..8e3273bd0b 100644
--- a/Signum.Engine/Connection/SqlConnector.cs
+++ b/Signum.Engine/Connection/SqlConnector.cs
@@ -458,7 +458,7 @@ public override bool AllowsMultipleQueries
             get { return true; }
         }
 
-        public SqlConnector ForDatabase(Maps.DatabaseName database)
+        public SqlConnector ForDatabase(Maps.DatabaseName? database)
         {
             if (database == null)
                 return this;
diff --git a/Signum.Engine/Database.cs b/Signum.Engine/Database.cs
index 3f2e460981..466ed2f2db 100644
--- a/Signum.Engine/Database.cs
+++ b/Signum.Engine/Database.cs
@@ -148,7 +148,7 @@ public static T Retrieve<T>(PrimaryKey id) where T : Entity
                             r.CompleteAll();
                         }
 
-                        if (filter != null && !filter.InMemoryFunction(result))
+                        if (filter != null && !filter.InMemoryFunction!(result))
                             throw new EntityNotFoundException(typeof(T), id);
 
                         return result;
@@ -196,7 +196,7 @@ public static async Task<T> RetrieveAsync<T>(PrimaryKey id, CancellationToken to
                             await r.CompleteAllAsync(token);
                         }
 
-                        if (filter != null && !filter.InMemoryFunction(result))
+                        if (filter != null && !filter.InMemoryFunction!(result))
                             throw new EntityNotFoundException(typeof(T), id);
 
                         return result;
diff --git a/Signum.Engine/DynamicQuery/DynamicQueryContainer.cs b/Signum.Engine/DynamicQuery/DynamicQueryContainer.cs
index 7b59b6ff1d..cf52f9dd01 100644
--- a/Signum.Engine/DynamicQuery/DynamicQueryContainer.cs
+++ b/Signum.Engine/DynamicQuery/DynamicQueryContainer.cs
@@ -102,7 +102,7 @@ async Task<T> ExecuteAsync<T>(ExecuteType executeType, object queryName, BaseQue
             }
         }
 
-        public event Func<ExecuteType, object, BaseQueryRequest?, IDisposable> QueryExecuted;
+        public event Func<ExecuteType, object, BaseQueryRequest?, IDisposable?> QueryExecuted;
 
         public enum ExecuteType
         {
diff --git a/Signum.Engine/Engine/Synchronizer.cs b/Signum.Engine/Engine/Synchronizer.cs
index e16993c802..f1f11dc963 100644
--- a/Signum.Engine/Engine/Synchronizer.cs
+++ b/Signum.Engine/Engine/Synchronizer.cs
@@ -315,9 +315,9 @@ public class AutoReplacementContext
         {
             public string ReplacementKey;
             public string OldValue;
-            public List<string> NewValues;
+            public List<string>? NewValues;
 
-            public AutoReplacementContext(string replacementKey, string oldValue, List<string> newValues)
+            public AutoReplacementContext(string replacementKey, string oldValue, List<string>? newValues)
             {
                 ReplacementKey = replacementKey;
                 OldValue = oldValue;
diff --git a/Signum.Engine/LinqExpandHints.cs b/Signum.Engine/LinqExpandHints.cs
index 98de5d86ea..cf76196200 100644
--- a/Signum.Engine/LinqExpandHints.cs
+++ b/Signum.Engine/LinqExpandHints.cs
@@ -1,4 +1,4 @@
-using Signum.Entities;
+using Signum.Entities;
 using System;
 using System.Linq;
 using System.Linq.Expressions;
@@ -8,7 +8,7 @@ namespace Signum.Engine
 {
     public static class LinqHintsExpand
     {
-        public static IQueryable<T> ExpandLite<T, L>(this IQueryable<T> source, Expression<Func<T, Lite<L>>> liteSelector, ExpandLite expandLite)
+        public static IQueryable<T> ExpandLite<T, L>(this IQueryable<T> source, Expression<Func<T, Lite<L>?>> liteSelector, ExpandLite expandLite)
             where L : class, IEntity
         {
             if (source == null)
@@ -17,7 +17,7 @@ public static IQueryable<T> ExpandLite<T, L>(this IQueryable<T> source, Expressi
             return source.Provider.CreateQuery<T>(Expression.Call(null, ((MethodInfo)MethodBase.GetCurrentMethod()).MakeGenericMethod(new Type[] { typeof(T), typeof(L) }), new Expression[] { source.Expression, Expression.Quote(liteSelector), Expression.Constant(expandLite) }));
         }
 
-        public static IQueryable<T> ExpandEntity<T, L>(this IQueryable<T> source, Expression<Func<T, L>> entitySelector, ExpandEntity expandEntity)
+        public static IQueryable<T> ExpandEntity<T, L>(this IQueryable<T> source, Expression<Func<T, L?>> entitySelector, ExpandEntity expandEntity)
             where L : class, IEntity
         {
             if (source == null)
diff --git a/Signum.Engine/Operations/OperationLogic.cs b/Signum.Engine/Operations/OperationLogic.cs
index 2bac7068ac..8d02b3f42e 100644
--- a/Signum.Engine/Operations/OperationLogic.cs
+++ b/Signum.Engine/Operations/OperationLogic.cs
@@ -767,7 +767,7 @@ public interface IEntityOperation : IOperation
     }
 
 
-    public delegate IDisposable SurroundOperationHandler(IOperation operation, OperationLogEntity log, Entity? entity, object[]? args);
+    public delegate IDisposable? SurroundOperationHandler(IOperation operation, OperationLogEntity log, Entity? entity, object[]? args);
     public delegate void OperationHandler(IOperation operation, Entity entity);
     public delegate void ErrorOperationHandler(IOperation operation, Entity entity, Exception ex);
     public delegate bool AllowOperationHandler(OperationSymbol operationSymbol, Type entityType, bool inUserInterface);
diff --git a/Signum.Engine/Patterns/VirtualMList.cs b/Signum.Engine/Patterns/VirtualMList.cs
index 3a46098ec4..cc0deab22b 100644
--- a/Signum.Engine/Patterns/VirtualMList.cs
+++ b/Signum.Engine/Patterns/VirtualMList.cs
@@ -56,14 +56,14 @@ public static IDisposable ConsiderNewType(Type parentType)
 
         public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
             Expression<Func<T, MList<L>>> mListField,
-            Expression<Func<L, Lite<T>>> getBackReference,
+            Expression<Func<L, Lite<T>?>> backReference,
             ExecuteSymbol<L> saveOperation,
             DeleteSymbol<L> deleteOperation)
             where T : Entity
             where L : Entity
         {
 
-            return fi.WithVirtualMList(mListField, getBackReference,
+            return fi.WithVirtualMList(mListField, backReference,
                 onSave: saveOperation == null ? null : new Action<L, T>((line, e) =>
                 {
                     line.Execute(saveOperation);
@@ -76,7 +76,7 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
 
         public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
             Expression<Func<T, MList<L>>> mListField,
-            Expression<Func<L, Lite<T>>> backReference,
+            Expression<Func<L, Lite<T>?>> backReference,
             Action<L, T>? onSave = null,
             Action<L, T>? onRemove = null,
             bool? lazyRetrieve = null,
@@ -259,7 +259,7 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
 
         public static FluentInclude<T> WithVirtualMListInitializeOnly<T, L>(this FluentInclude<T> fi,
             Expression<Func<T, MList<L>>> mListField,
-            Expression<Func<L, Lite<T>>> backReference,
+            Expression<Func<L, Lite<T>?>> backReference,
             Action<L, T>? onSave = null)
             where T : Entity
             where L : Entity
@@ -345,7 +345,7 @@ private static Expression SafeAccess(ParameterExpression param, MemberExpression
                 );
         }
 
-        public static Action<L, Lite<T>>? CreateSetter<T, L>(Expression<Func<L, Lite<T>>> getBackReference)
+        public static Action<L, Lite<T>>? CreateSetter<T, L>(Expression<Func<L, Lite<T>?>> getBackReference)
             where T : Entity
             where L : Entity
         {
diff --git a/Signum.Engine/Retriever.cs b/Signum.Engine/Retriever.cs
index 77873335d0..eba81a4d62 100644
--- a/Signum.Engine/Retriever.cs
+++ b/Signum.Engine/Retriever.cs
@@ -18,7 +18,7 @@ public interface IRetriever : IDisposable
 
         T? Complete<T>(PrimaryKey? id, Action<T> complete) where T : Entity;
         T? Request<T>(PrimaryKey? id) where T : Entity;
-        T? RequestIBA<T>(PrimaryKey? typeId, string id) where T : class, IEntity;
+        T? RequestIBA<T>(PrimaryKey? typeId, string? id) where T : class, IEntity;
         Lite<T>? RequestLite<T>(Lite<T>? lite) where T : class, IEntity;
         T? ModifiablePostRetrieving<T>(T? entity) where T : Modifiable;
         IRetriever? Parent { get; }
@@ -126,7 +126,7 @@ bool TryGetRequest((Type type, PrimaryKey id) key, out Entity value)
             return entity;
         }
 
-        public T? RequestIBA<T>(PrimaryKey? typeId, string id) where T : class, IEntity
+        public T? RequestIBA<T>(PrimaryKey? typeId, string? id) where T : class, IEntity
         {
             if (id == null)
                 return null;
@@ -307,7 +307,7 @@ static async Task<Dictionary<PrimaryKey, string>> GetStrings<T>(List<PrimaryKey>
             if (cc != null && cc.Enabled)
             {
                 cc.Load();
-                return ids.ToDictionary(a => a, a => cc.TryGetToString(a));
+                return ids.ToDictionary(a => a, a => cc.TryGetToString(a)!);
             }
             else if (token != null)
             {
@@ -364,7 +364,7 @@ public ChildRetriever(IRetriever parent, EntityCache.RealEntityCache entityCache
             return parent.Request<T>(id);
         }
 
-        public T? RequestIBA<T>(PrimaryKey? typeId, string id) where T : class, IEntity
+        public T? RequestIBA<T>(PrimaryKey? typeId, string? id) where T : class, IEntity
         {
             return parent.RequestIBA<T>(typeId, id);
         }
diff --git a/Signum.Engine/Schema/EntityEvents.cs b/Signum.Engine/Schema/EntityEvents.cs
index a7b2047402..3d0311763a 100644
--- a/Signum.Engine/Schema/EntityEvents.cs
+++ b/Signum.Engine/Schema/EntityEvents.cs
@@ -53,7 +53,7 @@ internal IEnumerable<FilterQueryResult<T>> OnFilterQuery()
             if (FilterQuery == null)
                 return Enumerable.Empty<FilterQueryResult<T>>();
 
-            return FilterQuery.GetInvocationListTyped().Select(f => f()).ToList();
+            return FilterQuery.GetInvocationListTyped().Select(f => f()).NotNull().ToList();
         }
 
         internal IDisposable? OnPreUnsafeDelete(IQueryable<T> entityQuery)
@@ -246,7 +246,7 @@ Action<T, M, IRetriever> CreateSetter()
     public delegate void RetrievedEventHandler<T>(T ident) where T : Entity;
     public delegate void SavingEventHandler<T>(T ident) where T : Entity;
     public delegate void SavedEventHandler<T>(T ident, SavedEventArgs args) where T : Entity;
-    public delegate FilterQueryResult<T> FilterQueryEventHandler<T>() where T : Entity;
+    public delegate FilterQueryResult<T>? FilterQueryEventHandler<T>() where T : Entity;
     public delegate void AlternativeRetriveEventHandler<T>(PrimaryKey id, AlternativeRetrieveArgs<T> args) where T : Entity;
 
     public delegate IDisposable? PreUnsafeDeleteHandler<T>(IQueryable<T> entityQuery);
@@ -276,14 +276,14 @@ public interface IFilterQueryResult
 
     public class FilterQueryResult<T> : IFilterQueryResult where T : Entity
     {
-        public FilterQueryResult(Expression<Func<T, bool>> inDatabaseExpression, Func<T, bool> inMemoryFunction)
+        public FilterQueryResult(Expression<Func<T, bool>> inDatabaseExpression, Func<T, bool>? inMemoryFunction)
         {
             this.InDatabaseExpresson = inDatabaseExpression;
             this.InMemoryFunction = inMemoryFunction;
         }
 
         public readonly Expression<Func<T, bool>> InDatabaseExpresson;
-        public readonly Func<T, bool> InMemoryFunction;
+        public readonly Func<T, bool>? InMemoryFunction;
 
         LambdaExpression IFilterQueryResult.InDatabaseExpression { get { return this.InDatabaseExpresson; } }
     }
diff --git a/Signum.Engine/Schema/FluentInclude.cs b/Signum.Engine/Schema/FluentInclude.cs
index 056880f8fb..5709087fe2 100644
--- a/Signum.Engine/Schema/FluentInclude.cs
+++ b/Signum.Engine/Schema/FluentInclude.cs
@@ -15,13 +15,13 @@ public FluentInclude(Table table, SchemaBuilder schemaBuilder)
             SchemaBuilder = schemaBuilder;
         }
 
-        public FluentInclude<T> WithUniqueIndex(Expression<Func<T, object>> fields, Expression<Func<T, bool>>? where = null, Expression<Func<T, object>>? includeFields = null)
+        public FluentInclude<T> WithUniqueIndex(Expression<Func<T, object?>> fields, Expression<Func<T, bool>>? where = null, Expression<Func<T, object?>>? includeFields = null)
         {
             this.SchemaBuilder.AddUniqueIndex<T>(fields, where, includeFields);
             return this;
         }
 
-        public FluentInclude<T> WithIndex(Expression<Func<T, object>> fields, 
+        public FluentInclude<T> WithIndex(Expression<Func<T, object?>> fields, 
             Expression<Func<T, bool>>? where = null, 
             Expression<Func<T, object>>? includeFields = null)
         {
diff --git a/Signum.Engine/Schema/Schema.cs b/Signum.Engine/Schema/Schema.cs
index e093da820b..db182d5547 100644
--- a/Signum.Engine/Schema/Schema.cs
+++ b/Signum.Engine/Schema/Schema.cs
@@ -66,7 +66,7 @@ public Dictionary<Type, Table> Tables
 
         #region Events
 
-        public event Func<Type, bool, string> IsAllowedCallback;
+        public event Func<Type, bool, string?> IsAllowedCallback;
 
         public string? IsAllowed(Type type, bool inUserInterface)
         {
@@ -317,7 +317,7 @@ internal IEnumerable<FieldBinding> GetAdditionalQueryBindings(PropertyRoute pare
             
             return new FilterQueryResult<T>(
                 a => one!.InDatabaseExpresson.Evaluate(a) && two.InDatabaseExpresson.Evaluate(a),
-                a => one!.InMemoryFunction(a) && two!.InMemoryFunction(a));
+                a => one!.InMemoryFunction!(a) && two!.InMemoryFunction!(a));
         }
 
         public Func<T, bool> GetInMemoryFilter<T>(bool userInterface)
@@ -801,7 +801,7 @@ public interface ICacheController
         void Complete(Entity entity, IRetriever retriver);
 
         string GetToString(PrimaryKey id);
-        string TryGetToString(PrimaryKey id);
+        string? TryGetToString(PrimaryKey id);
     }
 
     public class InvalidateEventArgs : EventArgs { }
@@ -823,9 +823,11 @@ void ICacheController.Complete(Entity entity, IRetriever retriver)
         public abstract void Complete(T entity, IRetriever retriver);
 
         public abstract string GetToString(PrimaryKey id);
-        public abstract string TryGetToString(PrimaryKey id);
+        public abstract string? TryGetToString(PrimaryKey id);
 
-        public abstract List<T> RequestByBackReference<R>(IRetriever retriever, Expression<Func<T, Lite<R>>> backReference, Lite<R> lite)
+        public abstract List<T> RequestByBackReference<R>(IRetriever retriever, Expression<Func<T, Lite<R>?>> backReference, Lite<R> lite)
             where R : Entity;
     }
+
+
 }
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
index 40cd0bb8e5..8444a348d4 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
@@ -66,7 +66,7 @@ public Schema Schema
         }
 
 
-        public UniqueIndex AddUniqueIndex<T>(Expression<Func<T, object>> fields, Expression<Func<T, bool>>? where = null, Expression<Func<T, object>>? includeFields = null) where T : Entity
+        public UniqueIndex AddUniqueIndex<T>(Expression<Func<T, object?>> fields, Expression<Func<T, bool>>? where = null, Expression<Func<T, object?>>? includeFields = null) where T : Entity
         {
             var table = Schema.Table<T>();
 
@@ -89,7 +89,7 @@ public UniqueIndex AddUniqueIndex<T>(Expression<Func<T, object>> fields, Express
             return index;
         }
 
-        public Index AddIndex<T>(Expression<Func<T, object>> fields, 
+        public Index AddIndex<T>(Expression<Func<T, object?>> fields, 
             Expression<Func<T, bool>>? where = null, 
             Expression<Func<T, object>>? includeFields = null) where T : Entity
         {
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
index 0b5b0b9be8..20b0de01be 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
@@ -234,13 +234,13 @@ private IsNullable GetIsNullablePrivate(PropertyRoute propertyRoute)
             return !propertyRoute.Type.IsValueType || propertyRoute.Type.IsNullable() ? IsNullable.Yes : IsNullable.No;
         }
 
-        public bool ImplementedBy<T>(Expression<Func<T, object>> propertyRoute, Type typeToImplement) where T : Entity
+        public bool ImplementedBy<T>(Expression<Func<T, object?>> propertyRoute, Type typeToImplement) where T : Entity
         {
             var imp = GetImplementations(propertyRoute);
             return !imp.IsByAll && imp.Types.Contains(typeToImplement);
         }
 
-        public void AssertImplementedBy<T>(Expression<Func<T, object>> propertyRoute, Type typeToImplement) where T : Entity
+        public void AssertImplementedBy<T>(Expression<Func<T, object?>> propertyRoute, Type typeToImplement) where T : Entity
         {
             var route = PropertyRoute.Construct(propertyRoute);
 
@@ -252,7 +252,7 @@ public void AssertImplementedBy<T>(Expression<Func<T, object>> propertyRoute, Ty
                     Implementations.ConsiderMessage(route, imp.Types.And(typeToImplement).ToString(t => $"typeof({t.TypeName()})", ", ")));
         }
 
-        public Implementations GetImplementations<T>(Expression<Func<T, object>> propertyRoute) where T : Entity
+        public Implementations GetImplementations<T>(Expression<Func<T, object?>> propertyRoute) where T : Entity
         {
             return GetImplementations(PropertyRoute.Construct(propertyRoute));
         }
diff --git a/Signum.Engine/Schema/UniqueIndex.cs b/Signum.Engine/Schema/UniqueIndex.cs
index d895e9fae8..c145105dbe 100644
--- a/Signum.Engine/Schema/UniqueIndex.cs
+++ b/Signum.Engine/Schema/UniqueIndex.cs
@@ -128,9 +128,7 @@ from c in GetColumns(finder, Expression.Lambda(Expression.Convert(a, typeof(obje
                 
                 return resultColumns.ToArray();
             }
-
-
-
+            
             return GetColumns(finder, columns);
         }
 
diff --git a/Signum.Entities/Basics/OperationLog.cs b/Signum.Entities/Basics/OperationLog.cs
index 76733b745f..3596cea406 100644
--- a/Signum.Entities/Basics/OperationLog.cs
+++ b/Signum.Entities/Basics/OperationLog.cs
@@ -24,7 +24,7 @@ public class OperationLogEntity : Entity
 
         static Expression<Func<OperationLogEntity, double?>> DurationExpression =
             log => (double?)(log.End - log.Start).Value.TotalMilliseconds;
-#pragma warning disable SF0002 // Use ExpressionFieldAttribute in non-trivial method or property CSBUG
+#pragma warning disable SF0002 // Use ExpressionFieldAttribute in non-trivial method or property
         [ExpressionField("DurationExpression"), Unit("ms")]
 #pragma warning restore SF0002 // Use ExpressionFieldAttribute in non-trivial method or property
         public double? Duration
diff --git a/Signum.Entities/DynamicQuery/ResultTable.cs b/Signum.Entities/DynamicQuery/ResultTable.cs
index 762f2d85f7..97278e028a 100644
--- a/Signum.Entities/DynamicQuery/ResultTable.cs
+++ b/Signum.Entities/DynamicQuery/ResultTable.cs
@@ -276,7 +276,7 @@ public DataTable ToDataTablePivot(int rowColumnIndex, int columnColumnIndex, int
 
             string Null = "- NULL -";
 
-            Dictionary<object, Dictionary<object, object>> dictionary =
+            Dictionary<object, Dictionary<object, object?>> dictionary =
                 this.Rows
                 .AgGroupToDictionary(
                     row => row[rowColumnIndex] ?? Null,
@@ -298,7 +298,7 @@ public DataTable ToDataTablePivot(int rowColumnIndex, int columnColumnIndex, int
             foreach (var kvp in dictionary)
             {
                 result.Rows.Add(
-                    allColumns.Select(val => defConverter.ConvertValue(kvp.Value.TryGetC(val), valueColumn.Column))
+                    allColumns.Select(val => defConverter.ConvertValue(kvp.Value.TryGetCN(val), valueColumn.Column))
                     .PreAnd(defConverter.ConvertValue(kvp.Key, rowColumn.Column))
                     .ToArray());
             }
@@ -417,12 +417,12 @@ public bool IsDirty
             }
         }
 
-        public object this[int columnIndex]
+        public object? this[int columnIndex]
         {
             get { return Table.Columns[columnIndex].Values[Index]; }
         }
 
-        public object this[ResultColumn column]
+        public object? this[ResultColumn column]
         {
             get { return column.Values[Index]; }
         }
@@ -445,22 +445,22 @@ public Lite<Entity>? TryEntity
 
         public T GetValue<T>(string columnName)
         {
-            return (T)this[Table.Columns.Where(c => c.Column.Name == columnName).SingleEx(() => columnName)];
+            return (T)this[Table.Columns.Where(c => c.Column.Name == columnName).SingleEx(() => columnName)]!;
         }
 
         public T GetValue<T>(int columnIndex)
         {
-            return (T)this[columnIndex];
+            return (T)this[columnIndex]!;
         }
 
         public T GetValue<T>(ResultColumn column)
         {
-            return (T)this[column];
+            return (T)this[column]!;
         }
 
-        public object[] GetValues(ResultColumn[] columnArray)
+        public object?[] GetValues(ResultColumn[] columnArray)
         {
-            var result = new object[columnArray.Length];
+            var result = new object?[columnArray.Length];
             for (int i = 0; i < columnArray.Length; i++)
             {
                 result[i] = this[columnArray[i]];
diff --git a/Signum.Entities/Lite.cs b/Signum.Entities/Lite.cs
index 480a095c86..f7b915a099 100644
--- a/Signum.Entities/Lite.cs
+++ b/Signum.Entities/Lite.cs
@@ -345,7 +345,7 @@ public static Lite<Entity> Create(Type type, PrimaryKey id)
             return giNewLite.GetInvoker(type)(id, null);
         }
 
-        public static Lite<Entity> Create(Type type, PrimaryKey id, string toStr)
+        public static Lite<Entity> Create(Type type, PrimaryKey id, string? toStr)
         {
             return giNewLite.GetInvoker(type)(id, toStr);
         }
@@ -361,7 +361,7 @@ public static Lite<T> ToLite<T>(this T entity)
         }
 
         [DebuggerStepThrough]
-        public static Lite<T> ToLite<T>(this T entity, string toStr)
+        public static Lite<T> ToLite<T>(this T entity, string? toStr)
             where T : class, IEntity
         {
             if (entity.IsNew)
@@ -471,7 +471,7 @@ public Expression Expand(Expression instance, Expression[] arguments, MethodInfo
         }
 
         [MethodExpander(typeof(IsEntityLiteExpander))]
-        public static bool Is<T>(this T entity1, Lite<T> lite2)
+        public static bool Is<T>(this T? entity1, Lite<T>? lite2)
              where T : class, IEntity
         {
             if (entity1 == null && lite2 == null)
@@ -511,7 +511,7 @@ public Expression Expand(Expression instance, Expression[] arguments, MethodInfo
         }
 
         [MethodExpander(typeof(IsLiteEntityExpander))]
-        public static bool Is<T>(this Lite<T> lite1, T entity2)
+        public static bool Is<T>(this Lite<T>? lite1, T? entity2)
             where T : class, IEntity
         {
             if (lite1 == null && entity2 == null)
diff --git a/Signum.Entities/ModifiableEntity.cs b/Signum.Entities/ModifiableEntity.cs
index 4e0dd5908d..aaecbc8e32 100644
--- a/Signum.Entities/ModifiableEntity.cs
+++ b/Signum.Entities/ModifiableEntity.cs
@@ -77,7 +77,7 @@ protected virtual bool Set<T>(ref T field, T value, [CallerMemberName]string? au
 
             SetSelfModified();
             field = value;
-            
+
             if (field is INotifyCollectionChanged cola)
             {
                 if (AttributeManager<NotifyCollectionChangedAttribute>.FieldContainsAttribute(GetType(), pi))
@@ -87,7 +87,7 @@ protected virtual bool Set<T>(ref T field, T value, [CallerMemberName]string? au
                     foreach (ModifiableEntity item in (IEnumerable)cola)
                         item.SetParentEntity(this);
             }
-            
+
             if (field is ModifiableEntity moda)
             {
                 if (AttributeManager<NotifyChildPropertyAttribute>.FieldContainsAttribute(GetType(), pi))
@@ -102,7 +102,7 @@ protected virtual bool Set<T>(ref T field, T value, [CallerMemberName]string? au
 
             return true;
         }
-        
+
         struct PropertyKey : IEquatable<PropertyKey>
         {
             public PropertyKey(Type type, string propertyName)
@@ -129,7 +129,7 @@ protected PropertyInfo GetPropertyInfo(string propertyName)
         }
 
         static Expression<Func<ModifiableEntity, string>> ToStringPropertyExpression = m => m.ToString();
-#pragma warning disable SF0002 // Use ExpressionFieldAttribute in non-trivial method or property CSBUG
+#pragma warning disable SF0002 // Use ExpressionFieldAttribute in non-trivial method or property
         [HiddenProperty, ExpressionField("ToStringPropertyExpression")]
 #pragma warning restore SF0002 // Use ExpressionFieldAttribute in non-trivial method or property
         public string ToStringProperty
@@ -140,7 +140,7 @@ public string ToStringProperty
                 return str.HasText() ? str : this.GetType().NiceName();
             }
         }
-
+        
         #region Collection Events
 
         protected internal override void PostRetrieving()
@@ -327,7 +327,7 @@ public string? Error
             }
         }
 
-        public string? PropertyCheck(Expression<Func<object>> property)
+        public string? PropertyCheck(Expression<Func<object?>> property)
         {
             return PropertyCheck(ReflectionTools.GetPropertyInfo(property).Name);
         }
@@ -347,7 +347,7 @@ public string? Error
             return null;
         }
 
-        protected static void Validate<T>(Expression<Func<T, object>> property, Func<T, PropertyInfo, string> validate) where T : ModifiableEntity
+        protected static void Validate<T>(Expression<Func<T, object?>> property, Func<T, PropertyInfo, string?> validate) where T : ModifiableEntity
         {
             Validator.PropertyValidator(property).StaticPropertyValidation += validate;
         }
diff --git a/Signum.Entities/PropertyRoute.cs b/Signum.Entities/PropertyRoute.cs
index 701e63c050..39e7f1b1e5 100644
--- a/Signum.Entities/PropertyRoute.cs
+++ b/Signum.Entities/PropertyRoute.cs
@@ -367,12 +367,12 @@ public Implementations GetImplementations()
             return FindImplementations(this);
         }
 
-        public static void SetIsAllowedCallback(Func<PropertyRoute, string> isAllowed)
+        public static void SetIsAllowedCallback(Func<PropertyRoute, string?> isAllowed)
         {
             IsAllowedCallback = isAllowed;
         }
 
-        static Func<PropertyRoute, string> IsAllowedCallback;
+        static Func<PropertyRoute, string?> IsAllowedCallback;
 
         public string? IsAllowed()
         {
diff --git a/Signum.Entities/Symbol.md b/Signum.Entities/Symbol.md
index e0772c9844..6eb90c8d03 100644
--- a/Signum.Entities/Symbol.md
+++ b/Signum.Entities/Symbol.md
@@ -166,4 +166,3 @@ In fact, we could classify entities depending their *staticness-dynamicness* lik
 * **Log Entities:** Automatically created by the system, and removed after some time. (i.e.: `OperationLogEntity`)
 
 **DOWN: Dynamic and unfrequently used**
- 
\ No newline at end of file
diff --git a/Signum.Entities/ValidationAttributes.cs b/Signum.Entities/ValidationAttributes.cs
index 8098f0925b..f887a6f714 100644
--- a/Signum.Entities/ValidationAttributes.cs
+++ b/Signum.Entities/ValidationAttributes.cs
@@ -851,11 +851,11 @@ public class StateValidator<E, S> : IEnumerable
         Func<E, S> getState;
         string[] propertyNames;
         PropertyInfo[] properties;
-        Func<E, object>[] getters;
+        Func<E, object?>[] getters;
 
         Dictionary<S, bool?[]> dictionary = new Dictionary<S, bool?[]>();
 
-        public StateValidator(Func<E, S> getState, params Expression<Func<E, object>>[] propertyGetters)
+        public StateValidator(Func<E, S> getState, params Expression<Func<E, object?>>[] propertyGetters)
         {
             this.getState = getState;
             this.properties = propertyGetters.Select(p => ReflectionTools.GetPropertyInfo(p)).ToArray();
diff --git a/Signum.Entities/Validator.cs b/Signum.Entities/Validator.cs
index 4349d01bd5..559bc02249 100644
--- a/Signum.Entities/Validator.cs
+++ b/Signum.Entities/Validator.cs
@@ -24,7 +24,7 @@ public static IDisposable ModelBinderScope()
             return new Disposable(() => inModelBinderVariable.Value = old);
         }
 
-        public static Func<ModifiableEntity, PropertyInfo, string> GlobalValidation { get; set; }
+        public static Func<ModifiableEntity, PropertyInfo, string?> GlobalValidation { get; set; }
 
         static Polymorphic<Dictionary<string, IPropertyValidator>> validators =
             new Polymorphic<Dictionary<string, IPropertyValidator>>(PolymorphicMerger.InheritDictionary, typeof(ModifiableEntity));
@@ -54,7 +54,7 @@ static void GenerateType<T>() where T : ModifiableEntity
 
   
 
-        public static PropertyValidator<T> OverridePropertyValidator<T>(Expression<Func<T, object>> property) where T : ModifiableEntity
+        public static PropertyValidator<T> OverridePropertyValidator<T>(Expression<Func<T, object?>> property) where T : ModifiableEntity
         {
             GenerateType<T>();
 
@@ -74,7 +74,7 @@ public static PropertyValidator<T> OverridePropertyValidator<T>(Expression<Func<
             return result;
         }
 
-        public static PropertyValidator<T> PropertyValidator<T>(Expression<Func<T, object>> property) where T : ModifiableEntity
+        public static PropertyValidator<T> PropertyValidator<T>(Expression<Func<T, object?>> property) where T : ModifiableEntity
         {
             GenerateType<T>();
 
@@ -155,7 +155,7 @@ public class PropertyValidator<T> : IPropertyValidator
         public Func<T, bool>? IsApplicableParentChildPropertyValidation { get; set; }
         public Func<T, bool>? IsApplicableStaticPropertyValidation { get; set; }
 
-        public Func<T, PropertyInfo, string>? StaticPropertyValidation { get; set; }
+        public Func<T, PropertyInfo, string?>? StaticPropertyValidation { get; set; }
 
         public bool Required => throw new NotImplementedException();
 
diff --git a/Signum.React/Signum.React.csproj b/Signum.React/Signum.React.csproj
index c33ebdbc2b..35dcec7fe0 100644
--- a/Signum.React/Signum.React.csproj
+++ b/Signum.React/Signum.React.csproj
@@ -18,7 +18,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.App" />
-    <PackageReference Include="Microsoft.TypeScript.MSBuild" Version="3.2.3">
+    <PackageReference Include="Microsoft.TypeScript.MSBuild" Version="3.3.1">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
diff --git a/Signum.Test/Signum.Test.csproj b/Signum.Test/Signum.Test.csproj
index 785fd30a99..a379b5febb 100644
--- a/Signum.Test/Signum.Test.csproj
+++ b/Signum.Test/Signum.Test.csproj
@@ -20,6 +20,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.2.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="2.2.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
+    <PackageReference Include="Signum.Analyzer" Version="1.0.1" />
     <PackageReference Include="xunit" Version="2.4.1" /> 
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1">
       <PrivateAssets>all</PrivateAssets>
@@ -34,7 +35,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Signum.Analyzer" Version="1.0.1" />
     <PackageReference Include="Signum.MSBuildTask" Version="1.0.3" />
   </ItemGroup>
 
diff --git a/Signum.Utilities/DescriptionManager.cs b/Signum.Utilities/DescriptionManager.cs
index d77b6310e1..2e878a970e 100644
--- a/Signum.Utilities/DescriptionManager.cs
+++ b/Signum.Utilities/DescriptionManager.cs
@@ -200,7 +200,7 @@ public static string NicePluralName(this Type type)
                 NaturalLanguageTools.Pluralize(DefaultTypeDescription(type)); 
         }
 
-        public static string NiceToString(this Enum a, params object[] args)
+        public static string NiceToString(this Enum a, params object?[] args)
         {
             return a.NiceToString().FormatWith(args);
         }
diff --git a/Signum.Utilities/Disposable.cs b/Signum.Utilities/Disposable.cs
index 9819eeed35..7d900d835b 100644
--- a/Signum.Utilities/Disposable.cs
+++ b/Signum.Utilities/Disposable.cs
@@ -39,7 +39,7 @@ public void Dispose()
                 () => { try { first!.Dispose(); } finally { second!.Dispose(); } });
         }
 
-        public static IDisposable? Combine<Del>(Del delegated, Func<Del, IDisposable> invoke) where Del : class, ICloneable, ISerializable
+        public static IDisposable? Combine<Del>(Del delegated, Func<Del, IDisposable?> invoke) where Del : class, ICloneable, ISerializable
         {
             if (delegated == null)
                 return null;
diff --git a/Signum.Utilities/Extensions/DictionaryExtensions.cs b/Signum.Utilities/Extensions/DictionaryExtensions.cs
index 2c102d9b36..fd344075a0 100644
--- a/Signum.Utilities/Extensions/DictionaryExtensions.cs
+++ b/Signum.Utilities/Extensions/DictionaryExtensions.cs
@@ -23,6 +23,13 @@ public static V TryGet<K, V>(this IReadOnlyDictionary<K, V> dictionary, K key, V
             return null;
         }
 
+        public static V? TryGetCN<K, V>(this IReadOnlyDictionary<K, V?> dictionary, K key) where V : class
+        {
+            if (dictionary.TryGetValue(key, out V? result))
+                return result;
+            return null;
+        }
+
         public static V? TryGetS<K, V>(this IReadOnlyDictionary<K, V> dictionary, K key) where V : struct
         {
             if (dictionary.TryGetValue(key, out V result))
@@ -47,7 +54,9 @@ public static V TryGet<K, V>(this IReadOnlyDictionary<K, V> dictionary, K key, V
             return result;
         }
 
-        public static V GetOrAdd<K, V>(this ConcurrentDictionary<K, V> dictionary, K key) where V : new()
+        public static V GetOrAdd<K, V>(this ConcurrentDictionary<K, V> dictionary, K key)
+            where K : object
+            where V : new()
         {
             return dictionary.GetOrAdd(key, k => new V());
         }
diff --git a/Signum.Utilities/Extensions/EnumerableExtensions.cs b/Signum.Utilities/Extensions/EnumerableExtensions.cs
index 312f2d95f1..0b8a9fcc71 100644
--- a/Signum.Utilities/Extensions/EnumerableExtensions.cs
+++ b/Signum.Utilities/Extensions/EnumerableExtensions.cs
@@ -500,7 +500,7 @@ public static string ToString<T>(this IEnumerable<T> source, string separator)
             return sb.ToString();  // Remove at the end is faster
         }
 
-        public static string ToString<T>(this IEnumerable<T> source, Func<T, string> toString, string separator)
+        public static string ToString<T>(this IEnumerable<T> source, Func<T, string?> toString, string separator)
         {
             StringBuilder? sb = null;
             foreach (var item in source)
@@ -519,7 +519,7 @@ public static string ToString<T>(this IEnumerable<T> source, Func<T, string> toS
             return sb.ToString();  // Remove at the end is faster
         }
 
-        public static string ToString<T>(this IQueryable<T> source, Expression<Func<T, string>> toString, string separator)
+        public static string ToString<T>(this IQueryable<T> source, Expression<Func<T, string?>> toString, string separator)
         {
             return source.Select(toString).ToString(separator);
         }
@@ -529,17 +529,17 @@ public static string CommaAnd<T>(this IEnumerable<T> collection)
             return CommaString(collection.Select(a => a!.ToString()).ToArray(), CollectionMessage.And.NiceToString());
         }
 
-        public static string CommaAnd<T>(this IEnumerable<T> collection, Func<T, string> toString)
+        public static string CommaAnd<T>(this IEnumerable<T> collection, Func<T, string?> toString)
         {
             return CommaString(collection.Select(toString).ToArray(), CollectionMessage.And.NiceToString());
         }
 
         public static string CommaOr<T>(this IEnumerable<T> collection)
         {
-            return CommaString(collection.Select(a => a!.ToString()).ToArray(), CollectionMessage.Or.NiceToString());
+            return CommaString(collection.Select(a => a?.ToString()).ToArray(), CollectionMessage.Or.NiceToString());
         }
 
-        public static string CommaOr<T>(this IEnumerable<T> collection, Func<T, string> toString)
+        public static string CommaOr<T>(this IEnumerable<T> collection, Func<T, string?> toString)
         {
             return CommaString(collection.Select(toString).ToArray(), CollectionMessage.Or.NiceToString());
         }
@@ -554,7 +554,7 @@ public static string Comma<T>(this IEnumerable<T> collection, Func<T, string> to
             return CommaString(collection.Select(toString).ToArray(), lastSeparator);
         }
 
-        static string CommaString(this string[] values, string lastSeparator)
+        static string CommaString(this string?[] values, string lastSeparator)
         {
             if (values.Length == 0)
                 return "";
diff --git a/Signum.Utilities/Extensions/Extensions.cs b/Signum.Utilities/Extensions/Extensions.cs
index ced4c0fa34..8f7602a60a 100644
--- a/Signum.Utilities/Extensions/Extensions.cs
+++ b/Signum.Utilities/Extensions/Extensions.cs
@@ -421,7 +421,7 @@ public static IEnumerable<T> Follow<T>(this T? start, FuncSN<T, T?> next) where
                 yield return i.Value;
         }
 
-        public static IEnumerable<D> GetInvocationListTyped<D>(this D multicastDelegate)
+        public static IEnumerable<D> GetInvocationListTyped<D>(this D? multicastDelegate)
             where D : class, ICloneable, ISerializable
         {
             if (multicastDelegate == null)
diff --git a/Signum.Utilities/Extensions/StringExtensions.cs b/Signum.Utilities/Extensions/StringExtensions.cs
index 2f6cd282d7..ceae580bd7 100644
--- a/Signum.Utilities/Extensions/StringExtensions.cs
+++ b/Signum.Utilities/Extensions/StringExtensions.cs
@@ -33,6 +33,18 @@ public static string DefaultText(this string? str, string defaultText)
                 return defaultText;
         }
 
+#pragma warning disable IDE0052 // Remove unread private members
+        static readonly Expression<Func<string, string>> EmtpyToNullExpression = a => a == null || a.Length == 0 ? null : a;
+#pragma warning restore IDE0052 // Remove unread private members
+        [ExpressionField("EmtpyToNullExpression")]
+        public static string? EmtpyToNull(this string? str)
+        {
+            if (!str.HasText())
+                return null;
+
+            return str;
+        }
+
         public static string AssertHasText(this string? str, string errorMessage)
         {
             if (str.HasText())
diff --git a/Signum.Utilities/Reflection/ReflectionTools.cs b/Signum.Utilities/Reflection/ReflectionTools.cs
index 98be3eed45..75625d332d 100644
--- a/Signum.Utilities/Reflection/ReflectionTools.cs
+++ b/Signum.Utilities/Reflection/ReflectionTools.cs
@@ -505,12 +505,12 @@ public static bool TryParse<T>(string value,  CultureInfo ci, out T result)
             }
         }
 
-        public static bool TryParse(string value, Type type, out object? result)
+        public static bool TryParse(string? value, Type type, out object? result)
         {
             return TryParse(value, type, CultureInfo.CurrentCulture, out result);
         }
 
-        public static bool TryParse(string value, Type type, CultureInfo ci, out object? result)
+        public static bool TryParse(string? value, Type type, CultureInfo ci, out object? result)
         {
             if (type == typeof(string))
             {
@@ -698,7 +698,7 @@ public static bool TryParse(string value, Type type, CultureInfo ci, out object?
             }
         }
 
-        public static T ChangeType<T>(object value)
+        public static T ChangeType<T>(object? value)
         {
             if (value == null)
                 return (T)(object?)null!;
diff --git a/Signum.Utilities/SafeConsole.cs b/Signum.Utilities/SafeConsole.cs
index f29af664a0..b0913eb5cc 100644
--- a/Signum.Utilities/SafeConsole.cs
+++ b/Signum.Utilities/SafeConsole.cs
@@ -12,17 +12,17 @@ public static class SafeConsole
         public static readonly object SyncKey = new object();
         static bool needToClear = false;
 
-        public static void WriteSameLine(string format, params object[] parameters)
+        public static void WriteSameLine(string? format, params object?[] parameters)
         {
             WriteSameLine(string.Format(format, parameters));
         }
 
-        public static void WriteSameLine(string str)
+        public static void WriteSameLine(string? str)
         {
             if (needToClear)
-                str = str.PadChopRight(Console.BufferWidth - 1);
+                str = str?.PadChopRight(Console.BufferWidth - 1);
             else
-                str = str.TryStart(Console.BufferWidth - 1)!;
+                str = str?.TryStart(Console.BufferWidth - 1)!;
 
             Console.WriteLine(str);
 
@@ -57,12 +57,12 @@ public static void WriteColor(ConsoleColor color, string str)
 
 
 
-        public static void WriteLineColor(ConsoleColor color, string format, params object[] parameters)
+        public static void WriteLineColor(ConsoleColor color, string? format, params object?[] parameters)
         {
             WriteLineColor(color, string.Format(format, parameters));
         }
 
-        public static void WriteLineColor(ConsoleColor color, string str)
+        public static void WriteLineColor(ConsoleColor color, string? str)
         {
             ConsoleColor old = Console.ForegroundColor;
             Console.ForegroundColor = color;
@@ -70,7 +70,7 @@ public static void WriteLineColor(ConsoleColor color, string str)
             Console.ForegroundColor = old;
         }
 
-        public static void WriteSameLineColor(ConsoleColor color, string str)
+        public static void WriteSameLineColor(ConsoleColor color, string? str)
         {
             ConsoleColor old = Console.ForegroundColor;
             Console.ForegroundColor = color;

From d50cc89683daf155ac225468786d46710d2de43d Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Wed, 13 Feb 2019 17:01:46 +0100
Subject: [PATCH 21/25] more on no nullable

---
 Signum.Engine/Database.cs                     |    5 +-
 .../DynamicQuery/ManualDynamicQuery.cs        |    2 +-
 Signum.Engine/Engine/SchemaSynchronizer.cs    |    2 +-
 .../OverloadingSimplifier.cs                  |   18 +-
 Signum.Engine/Operations/OperationLogic.cs    |    2 +-
 Signum.Engine/Patterns/VirtualMList.cs        |   16 +-
 Signum.Engine/Retriever.cs                    |    4 +-
 Signum.Engine/Schema/Schema.Delete.cs         |    2 +-
 Signum.Engine/Schema/Schema.Save.cs           | 2824 ++++++++---------
 .../Schema/SchemaBuilder/SchemaBuilder.cs     |    4 +-
 .../SchemaBuilder/SchemaBuilderSettings.cs    |   17 +-
 Signum.Engine/Signum.Engine.csproj            |    4 -
 Signum.Entities/Basics/Exception.cs           |    3 +-
 Signum.Entities/Basics/OperationLog.cs        |    2 +-
 Signum.Entities/Basics/PropertyRouteEntity.cs |    1 -
 Signum.Entities/DynamicQuery/ResultTable.cs   |    2 +-
 .../DynamicQuery/Tokens/QueryToken.cs         |    4 +-
 Signum.Entities/FieldAttributes.cs            |    6 +-
 Signum.Entities/MList.cs                      |    8 +-
 Signum.Entities/Signum.Entities.csproj        |    4 -
 Signum.Entities/ValidationAttributes.cs       |    7 +-
 Signum.Entities/Validator.cs                  |    7 +-
 .../ApiControllers/QueryController.cs         |   12 +-
 Signum.React/Facades/ReflectionServer.cs      |    2 +-
 Signum.React/Filters/SignumFilters.cs         |    2 +-
 .../JsonConverters/LiteJsonConverter.cs       |    2 +-
 .../JsonConverters/MListJsonConverter.cs      |    2 +-
 .../Scripts/Signum.Entities.Basics.ts         |   68 +-
 .../Scripts/Signum.Entities.Patterns.ts       |    2 +-
 Signum.React/Scripts/Signum.Entities.ts       |    4 +-
 Signum.React/Signum.React.csproj              |    8 +-
 .../EntityDeclarationGenerator.cs             |   24 +-
 .../Properties/launchSettings.json            |   14 +-
 .../Signum.TSGenerator.2.0.0-beta2.nupkg      |  Bin 0 -> 261558 bytes
 Signum.TSGenerator/Signum.TSGenerator.csproj  |    2 +-
 Signum.TSGenerator/Signum.TSGenerator.nuspec  |    2 +-
 Signum.Test/Environment/Entities.cs           |    1 -
 Signum.Utilities/Csv.cs                       |    7 +-
 Signum.Utilities/DescriptionManager.cs        |    6 +-
 .../ExpressionExpanderAttributes.cs           |    3 +-
 .../ExpressionTrees/ExpressionCleaner.cs      |   14 +-
 .../Extensions/EnumerableExtensions.cs        |    2 +
 Signum.Utilities/Extensions/FileExtensions.cs |    4 +-
 Signum.Utilities/Extensions/TreeHelper.cs     |    5 +-
 .../NaturalLanguage/NaturalLanguageTools.cs   |    2 +
 Signum.Utilities/NotNullAttributes.cs         |   15 +-
 Signum.Utilities/Profiler/HeavyProfiler.cs    |    2 +-
 Signum.Utilities/Reflection/GenericInvoker.cs |   13 +-
 Signum.Utilities/Signum.Utilities.csproj      |    4 -
 Signum.Utilities/Statics.cs                   |    8 +-
 Signum.Utilities/StringDistance.cs            |    2 +-
 51 files changed, 1594 insertions(+), 1582 deletions(-)
 create mode 100644 Signum.TSGenerator/Signum.TSGenerator.2.0.0-beta2.nupkg

diff --git a/Signum.Engine/Database.cs b/Signum.Engine/Database.cs
index 466ed2f2db..44a85af0e3 100644
--- a/Signum.Engine/Database.cs
+++ b/Signum.Engine/Database.cs
@@ -314,11 +314,8 @@ public static async Task<Lite<T>> RetrieveLiteAsync<T>(PrimaryKey id, Cancellati
             }
         }
 
-        public static Lite<T>? FillToString<T>(this Lite<T> lite) where T : class, IEntity
+        public static Lite<T> FillToString<T>(this Lite<T> lite) where T : class, IEntity
         {
-            if (lite == null)
-                return null;
-
             lite.SetToString(GetToStr(lite.EntityType, lite.Id));
 
             return lite;
diff --git a/Signum.Engine/DynamicQuery/ManualDynamicQuery.cs b/Signum.Engine/DynamicQuery/ManualDynamicQuery.cs
index 7f15801a4a..9077d2b5a8 100644
--- a/Signum.Engine/DynamicQuery/ManualDynamicQuery.cs
+++ b/Signum.Engine/DynamicQuery/ManualDynamicQuery.cs
@@ -83,7 +83,7 @@ public override async Task<ResultTable> ExecuteQueryGroupAsync(QueryRequest requ
                 req.Pagination = new Pagination.Paginate(1, 1);
                 req.Columns.Add(new Column(this.EntityColumnFactory().BuildColumnDescription(), QueryName));
                 var result = await Execute(req, GetQueryDescription(), cancellationToken);
-                return result.TotalElements.Value;
+                return result.TotalElements!.Value;
             }
 
             else if (request.ValueToken is AggregateToken)
diff --git a/Signum.Engine/Engine/SchemaSynchronizer.cs b/Signum.Engine/Engine/SchemaSynchronizer.cs
index 3cd83fcb66..9301583cb3 100644
--- a/Signum.Engine/Engine/SchemaSynchronizer.cs
+++ b/Signum.Engine/Engine/SchemaSynchronizer.cs
@@ -911,7 +911,7 @@ private static Entity Clone(Entity current)
         {
             var instance = (Entity)Activator.CreateInstance(current.GetType());
             instance.toStr = current.toStr;
-            instance.id = (int)current.id.Value + 1000000;
+            instance.id = (int)current.id!.Value + 1000000;
             return instance;
         }
 
diff --git a/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs b/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
index eb780e0653..9f38bad865 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
@@ -50,10 +50,7 @@ internal class OverloadingSimplifier : ExpressionVisitor
 
         static MethodInfo miWhereIndexQ = ReflectionTools.GetMethodInfo(() => Queryable.Where((IQueryable<string>)null, (a, i) => false)).GetGenericMethodDefinition();
         static MethodInfo miWhereIndexE = ReflectionTools.GetMethodInfo(() => Enumerable.Where((IEnumerable<string>)null, (a, i) => false)).GetGenericMethodDefinition();
-
-        static MethodInfo miContainsQ = ReflectionTools.GetMethodInfo(() => Queryable.Contains((IQueryable<string>)null, null)).GetGenericMethodDefinition();
-        static MethodInfo miContainsE = ReflectionTools.GetMethodInfo(() => Enumerable.Contains((IEnumerable<string>)null, null)).GetGenericMethodDefinition();
-
+        
         static MethodInfo miElementAtQ = ReflectionTools.GetMethodInfo(() => Queryable.ElementAt((IQueryable<string>)null, 0)).GetGenericMethodDefinition();
         static MethodInfo miElementAtE = ReflectionTools.GetMethodInfo(() => Enumerable.ElementAt((IEnumerable<string>)null, 0)).GetGenericMethodDefinition();
 
@@ -405,6 +402,19 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
                 }
             }
 
+            if(m.Method.DeclaringType == typeof (Signum.Utilities.Extensions) && m.Method.Name == "Try")
+            {
+                var t = m.GetArgument("t");
+                var func = (LambdaExpression)m.GetArgument("func");
+
+                var result = ExpressionReplacer.Replace(func.Body, new Dictionary<ParameterExpression, Expression>
+                {
+                    { func.Parameters.SingleEx(), t.UnNullify() }
+                }).Nullify();
+
+                return Visit(result);
+            }
+
             if (m.Method.DeclaringType == typeof(string) && m.Method.Name == nameof(string.Format))
                 return VisitFormat(m);
 
diff --git a/Signum.Engine/Operations/OperationLogic.cs b/Signum.Engine/Operations/OperationLogic.cs
index 8d02b3f42e..c1c9b4c13e 100644
--- a/Signum.Engine/Operations/OperationLogic.cs
+++ b/Signum.Engine/Operations/OperationLogic.cs
@@ -160,7 +160,7 @@ public static void ExceptionLogic_DeleteLogs(DeleteLogParametersEmbedded paramet
             if (dateLimit == null)
                 return;
 
-            Database.Query<OperationLogEntity>().Where(o => o.Start < dateLimit.Value).UnsafeDeleteChunksLog(parameters, sb, token);
+            Database.Query<OperationLogEntity>().Where(o => o.Start < dateLimit!.Value).UnsafeDeleteChunksLog(parameters, sb, token);
         }
 
         static void OperationLogic_Initializing()
diff --git a/Signum.Engine/Patterns/VirtualMList.cs b/Signum.Engine/Patterns/VirtualMList.cs
index cc0deab22b..5edb7c6f84 100644
--- a/Signum.Engine/Patterns/VirtualMList.cs
+++ b/Signum.Engine/Patterns/VirtualMList.cs
@@ -87,11 +87,9 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
             var mListPropertRoute = PropertyRoute.Construct(mListField);
             RegisteredVirtualMLists.GetOrCreate(typeof(T)).Add(typeof(L), mListPropertRoute);
 
-            if (lazyRetrieve == null)
-                lazyRetrieve = (typeof(L) == typeof(T));
-
-            if (lazyDelete == null)
-                lazyDelete = (typeof(L) == typeof(T));
+            
+            var defLazyRetrieve = lazyRetrieve ?? (typeof(L) == typeof(T));
+            var defLazyDelete = lazyDelete ?? (typeof(L) == typeof(T));
 
             Func<T, MList<L>> getMList = GetAccessor(mListField);
             Action<L, Lite<T>>? setter = null;
@@ -104,7 +102,7 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
 
             var sb = fi.SchemaBuilder;
 
-            if (lazyRetrieve.Value)
+            if (defLazyRetrieve)
             {
                 sb.Schema.EntityEvents<T>().Retrieved += (T e) =>
                 {
@@ -130,7 +128,7 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
             if (preserveOrder)
             {
                 sb.Schema.EntityEvents<T>().RegisterBinding<MList<L>>(mListField,
-                     shouldSet: () => !lazyRetrieve.Value && !VirtualMList.ShouldAvoidMListType(typeof(L)),
+                     shouldSet: () => !defLazyRetrieve && !VirtualMList.ShouldAvoidMListType(typeof(L)),
                      valueExpression: e => Database.Query<L>().Where(line => backReference.Evaluate(line) == e.ToLite()).ExpandLite(line => backReference.Evaluate(line), ExpandLite.ToStringLazy).ToVirtualMListWithOrder(),
                      valueFunction: (e, retriever) => Schema.Current.CacheController<L>()!.Enabled ?
                      Schema.Current.CacheController<L>()!.RequestByBackReference<T>(retriever, backReference, e.ToLite()).ToVirtualMListWithOrder():
@@ -141,7 +139,7 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
             else
             {
                 sb.Schema.EntityEvents<T>().RegisterBinding(mListField,
-                    shouldSet: () => !lazyRetrieve.Value && !VirtualMList.ShouldAvoidMListType(typeof(L)),
+                    shouldSet: () => !defLazyRetrieve && !VirtualMList.ShouldAvoidMListType(typeof(L)),
                     valueExpression: e => Database.Query<L>().Where(line => backReference.Evaluate(line) == e.ToLite()).ExpandLite(line => backReference.Evaluate(line), ExpandLite.ToStringLazy).ToVirtualMList(),
                     valueFunction: (e, retriever) => Schema.Current.CacheController<L>()!.Enabled ?
                     Schema.Current.CacheController<L>()!.RequestByBackReference<T>(retriever, backReference, e.ToLite()).ToVirtualMList() :
@@ -242,7 +240,7 @@ public static FluentInclude<T> WithVirtualMList<T, L>(this FluentInclude<T> fi,
 
                 //You can do a VirtualMList to itself at the table level, but there should not be cycles inside the instances
                 var toDelete = Database.Query<L>().Where(se => query.Any(e => backReference.Evaluate(se).Is(e)));
-                if (lazyDelete.Value)
+                if (defLazyDelete)
                 {
                     if (toDelete.Any())
                         toDelete.UnsafeDelete();
diff --git a/Signum.Engine/Retriever.cs b/Signum.Engine/Retriever.cs
index eba81a4d62..fbff836006 100644
--- a/Signum.Engine/Retriever.cs
+++ b/Signum.Engine/Retriever.cs
@@ -131,7 +131,7 @@ bool TryGetRequest((Type type, PrimaryKey id) key, out Entity value)
             if (id == null)
                 return null;
 
-            Type type = TypeLogic.IdToType[typeId.Value];
+            Type type = TypeLogic.IdToType[typeId!.Value];
 
             var parsedId = PrimaryKey.Parse(id, type);
 
@@ -312,7 +312,7 @@ static async Task<Dictionary<PrimaryKey, string>> GetStrings<T>(List<PrimaryKey>
             else if (token != null)
             {
                 var tasks = ids.GroupsOf(Schema.Current.Settings.MaxNumberOfParameters)
-                   .Select(gr => Database.Query<T>().Where(e => gr.Contains(e.Id)).Select(a => KVP.Create(a.Id, a.ToString())).ToListAsync(token.Value))
+                   .Select(gr => Database.Query<T>().Where(e => gr.Contains(e.Id)).Select(a => KVP.Create(a.Id, a.ToString())).ToListAsync(token!.Value))
                    .ToList();
 
                 var list = await Task.WhenAll(tasks);
diff --git a/Signum.Engine/Schema/Schema.Delete.cs b/Signum.Engine/Schema/Schema.Delete.cs
index 41561cf92e..8064bfd690 100644
--- a/Signum.Engine/Schema/Schema.Delete.cs
+++ b/Signum.Engine/Schema/Schema.Delete.cs
@@ -36,7 +36,7 @@ private SqlPreCommand DeclarePrimaryKeyVariable<T>(T entity, Expression<Func<T,
             var query = DbQueryProvider.Single.GetMainSqlCommand(Database.Query<T>().Where(where).Select(a => a.Id).Expression);
 
             string variableName = SqlParameterBuilder.GetParameterName(this.Name.Name + "Id_" + (parameterIndex++));
-            entity.SetId(new Entities.PrimaryKey(entity.id.Value.Object, variableName));
+            entity.SetId(new Entities.PrimaryKey(entity.id!.Value.Object, variableName));
 
             string queryString = query.PlainSql().Lines().ToString(" ");
 
diff --git a/Signum.Engine/Schema/Schema.Save.cs b/Signum.Engine/Schema/Schema.Save.cs
index b2f37c0c97..154a57fe6d 100644
--- a/Signum.Engine/Schema/Schema.Save.cs
+++ b/Signum.Engine/Schema/Schema.Save.cs
@@ -1,104 +1,104 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Signum.Entities;
-using Signum.Utilities;
-using Signum.Entities.Reflection;
-using System.Linq.Expressions;
-using System.Reflection;
-using Signum.Utilities.Reflection;
-using System.Data;
-using Signum.Utilities.ExpressionTrees;
-using System.Text;
-using Signum.Utilities.DataStructures;
-using System.Data.Common;
-using System.Collections.Concurrent;
-using Signum.Engine.Basics;
-
-namespace Signum.Engine.Maps
-{
-    public struct Forbidden
-    {
-        public Forbidden(HashSet<Entity>? set)
-        {
-            this.set = set;
-        }
-
-        public Forbidden(DirectedGraph<Entity>? graph, Entity entity)
-        {
-            this.set = graph?.TryRelatedTo(entity);
-        }
-
-        readonly HashSet<Entity>? set;
-
-        public bool IsEmpty
-        {
-            get { return set == null || set.Count == 0; }
-        }
-
-        public bool Contains(Entity entity)
-        {
-            return set != null && set.Contains(entity);
-        }
-    }
-
-    public struct EntityForbidden
-    {
-        public readonly Entity Entity;
-        public readonly Forbidden Forbidden;
-
-        public EntityForbidden(Entity entity, Forbidden forbidden)
-        {
-            this.Entity = (Entity)entity;
-            this.Forbidden = forbidden;
-        }
-
-        public EntityForbidden(Entity entity, DirectedGraph<Entity>? graph)
-        {
-            this.Entity = (Entity)entity;
-            this.Forbidden = new Forbidden(graph, entity);
-        }
-    }
-
-    public partial class Table
-    {
-        ResetLazy<InsertCacheIdentity> inserterIdentity;
-        ResetLazy<InsertCacheDisableIdentity> inserterDisableIdentity;
-
-        internal void InsertMany(List<Entity> list, DirectedGraph<Entity>? backEdges)
-        {
-            using (HeavyProfiler.LogNoStackTrace("InsertMany", () => this.Type.TypeName()))
-            {
-                if (IdentityBehaviour)
-                {
-                    InsertCacheIdentity ic = inserterIdentity.Value;
-                    list.SplitStatements(this.Columns.Count, ls => ic.GetInserter(ls.Count)(ls, backEdges));
-                }
-                else
-                {
-                    InsertCacheDisableIdentity ic = inserterDisableIdentity.Value;
-                    list.SplitStatements(this.Columns.Count, ls => ic.GetInserter(ls.Count)(ls, backEdges));
-                }
-            }
-        }
-
-        internal object[] BulkInsertDataRow(object/*Entity or IView*/ entity)
-        {
-            var parameters = IdentityBehaviour ?
-                inserterIdentity.Value.InsertParameters((Entity)entity, new Forbidden(), "") :
-                inserterDisableIdentity.Value.InsertParameters(entity, new Forbidden(), "");
-
-            return parameters.Select(a => a.Value).ToArray();
-        }
-
-        class InsertCacheDisableIdentity
-        {
-            internal Table table;
-
-            public Func<string, string> SqlInsertPattern;
-            public Func<object /*Entity*/, Forbidden, string, List<DbParameter>> InsertParameters;
-
-            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>> insertDisableIdentityCache =
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Signum.Entities;
+using Signum.Utilities;
+using Signum.Entities.Reflection;
+using System.Linq.Expressions;
+using System.Reflection;
+using Signum.Utilities.Reflection;
+using System.Data;
+using Signum.Utilities.ExpressionTrees;
+using System.Text;
+using Signum.Utilities.DataStructures;
+using System.Data.Common;
+using System.Collections.Concurrent;
+using Signum.Engine.Basics;
+
+namespace Signum.Engine.Maps
+{
+    public struct Forbidden
+    {
+        public Forbidden(HashSet<Entity>? set)
+        {
+            this.set = set;
+        }
+
+        public Forbidden(DirectedGraph<Entity>? graph, Entity entity)
+        {
+            this.set = graph?.TryRelatedTo(entity);
+        }
+
+        readonly HashSet<Entity>? set;
+
+        public bool IsEmpty
+        {
+            get { return set == null || set.Count == 0; }
+        }
+
+        public bool Contains(Entity entity)
+        {
+            return set != null && set.Contains(entity);
+        }
+    }
+
+    public struct EntityForbidden
+    {
+        public readonly Entity Entity;
+        public readonly Forbidden Forbidden;
+
+        public EntityForbidden(Entity entity, Forbidden forbidden)
+        {
+            this.Entity = (Entity)entity;
+            this.Forbidden = forbidden;
+        }
+
+        public EntityForbidden(Entity entity, DirectedGraph<Entity>? graph)
+        {
+            this.Entity = (Entity)entity;
+            this.Forbidden = new Forbidden(graph, entity);
+        }
+    }
+
+    public partial class Table
+    {
+        ResetLazy<InsertCacheIdentity> inserterIdentity;
+        ResetLazy<InsertCacheDisableIdentity> inserterDisableIdentity;
+
+        internal void InsertMany(List<Entity> list, DirectedGraph<Entity>? backEdges)
+        {
+            using (HeavyProfiler.LogNoStackTrace("InsertMany", () => this.Type.TypeName()))
+            {
+                if (IdentityBehaviour)
+                {
+                    InsertCacheIdentity ic = inserterIdentity.Value;
+                    list.SplitStatements(this.Columns.Count, ls => ic.GetInserter(ls.Count)(ls, backEdges));
+                }
+                else
+                {
+                    InsertCacheDisableIdentity ic = inserterDisableIdentity.Value;
+                    list.SplitStatements(this.Columns.Count, ls => ic.GetInserter(ls.Count)(ls, backEdges));
+                }
+            }
+        }
+
+        internal object[] BulkInsertDataRow(object/*Entity or IView*/ entity)
+        {
+            var parameters = IdentityBehaviour ?
+                inserterIdentity.Value.InsertParameters((Entity)entity, new Forbidden(), "") :
+                inserterDisableIdentity.Value.InsertParameters(entity, new Forbidden(), "");
+
+            return parameters.Select(a => a.Value).ToArray();
+        }
+
+        class InsertCacheDisableIdentity
+        {
+            internal Table table;
+
+            public Func<string, string> SqlInsertPattern;
+            public Func<object /*Entity*/, Forbidden, string, List<DbParameter>> InsertParameters;
+
+            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>> insertDisableIdentityCache =
                 new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>>();
 
             public InsertCacheDisableIdentity(Table table, Func<string, string> sqlInsertPattern, Func<object, Forbidden, string, List<DbParameter>> insertParameters)
@@ -106,115 +106,115 @@ public InsertCacheDisableIdentity(Table table, Func<string, string> sqlInsertPat
                 this.table = table;
                 SqlInsertPattern = sqlInsertPattern;
                 InsertParameters = insertParameters;
-            }
-
-            internal Action<List<Entity>, DirectedGraph<Entity>?> GetInserter(int numElements)
-            {
-                return insertDisableIdentityCache.GetOrAdd(numElements, (int num) => num == 1 ? GetInsertDisableIdentity() : GetInsertMultiDisableIdentity(num));
-            }
-
-
-            Action<List<Entity>, DirectedGraph<Entity>?> GetInsertDisableIdentity()
-            {
-                string sqlSingle = SqlInsertPattern("");
-
-                return (list, graph) =>
-                {
-                    Entity entity = list.Single();
-
-                    AssertHasId(entity);
-                    
-                    entity.Ticks = TimeZoneManager.Now.Ticks;
-
-                    table.SetToStrField(entity);
-
-                    var forbidden = new Forbidden(graph, entity);
-
-                    new SqlPreCommandSimple(sqlSingle, InsertParameters(entity, forbidden, "")).ExecuteNonQuery();
-
-                    entity.IsNew = false;
-                    if (table.saveCollections.Value != null)
-                        table.saveCollections.Value.InsertCollections(new List<EntityForbidden> { new EntityForbidden(entity, forbidden) });
-                };
-            }
-
-
-
-            Action<List<Entity>, DirectedGraph<Entity>?> GetInsertMultiDisableIdentity(int num)
-            {
-                string sqlMulti = Enumerable.Range(0, num).ToString(i => SqlInsertPattern(i.ToString()), ";\r\n");
-
-                return (entities, graph) =>
-                {
-                    for (int i = 0; i < num; i++)
-                    {
-                        var entity = entities[i];
-                        AssertHasId(entity);
-
-                        entity.Ticks = TimeZoneManager.Now.Ticks;
-
-                        table.SetToStrField(entity);
-                    }
-
-                    List<DbParameter> result = new List<DbParameter>();
-                    for (int i = 0; i < entities.Count; i++)
-                        result.AddRange(InsertParameters(entities[i], new Forbidden(graph, entities[i]), i.ToString()));
-
-                    new SqlPreCommandSimple(sqlMulti, result).ExecuteNonQuery();
-                    for (int i = 0; i < num; i++)
-                    {
-                        Entity ident = entities[i];
-
-                        ident.IsNew = false;
-                    }
-
-                    if (table.saveCollections.Value != null)
-                        table.saveCollections.Value.InsertCollections(entities.Select(e => new EntityForbidden(e, graph)).ToList());
-                };
-            }
-
-            internal static InsertCacheDisableIdentity InitializeInsertDisableIdentity(Table table)
-            {
-                using (HeavyProfiler.LogNoStackTrace("InitializeInsertDisableIdentity", () => table.Type.TypeName()))
-                {
-                    var trios = new List<Table.Trio>();
-                    var assigments = new List<Expression>();
-                    var paramIdent = Expression.Parameter(typeof(object) /*Entity*/, "ident");
-                    var paramForbidden = Expression.Parameter(typeof(Forbidden), "forbidden");
-                    var paramSuffix = Expression.Parameter(typeof(string), "suffix");
-
-                    var cast = Expression.Parameter(table.Type, "casted");
-                    assigments.Add(Expression.Assign(cast, Expression.Convert(paramIdent, table.Type)));
-
-                    foreach (var item in table.Fields.Values)
-                        item.Field.CreateParameter(trios, assigments, Expression.Field(cast, item.FieldInfo), paramForbidden, paramSuffix);
-
-                    if (table.Mixins != null)
-                        foreach (var item in table.Mixins.Values)
-                            item.CreateParameter(trios, assigments, cast, paramForbidden, paramSuffix);
-
-                    Func<string, string> insertPattern = (suffix) =>
-                        "INSERT {0} ({1})\r\n VALUES ({2})".FormatWith(table.Name,
-                        trios.ToString(p => p.SourceColumn.SqlEscape(), ", "),
-                        trios.ToString(p => p.ParameterName + suffix, ", "));
-
-                    var expr = Expression.Lambda<Func<object, Forbidden, string, List<DbParameter>>>(
-                        CreateBlock(trios.Select(a => a.ParameterBuilder), assigments), paramIdent, paramForbidden, paramSuffix);
-
-                    
-                    return new InsertCacheDisableIdentity(table, insertPattern, expr.Compile());
-                }
-            }
-        }
-
-        class InsertCacheIdentity
-        {
-            internal Table table;
-
-            public Func<string, bool, string> SqlInsertPattern;
-            public Func<Entity, Forbidden, string, List<DbParameter>> InsertParameters;
-
-            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>> insertIdentityCache =
+            }
+
+            internal Action<List<Entity>, DirectedGraph<Entity>?> GetInserter(int numElements)
+            {
+                return insertDisableIdentityCache.GetOrAdd(numElements, (int num) => num == 1 ? GetInsertDisableIdentity() : GetInsertMultiDisableIdentity(num));
+            }
+
+
+            Action<List<Entity>, DirectedGraph<Entity>?> GetInsertDisableIdentity()
+            {
+                string sqlSingle = SqlInsertPattern("");
+
+                return (list, graph) =>
+                {
+                    Entity entity = list.Single();
+
+                    AssertHasId(entity);
+                    
+                    entity.Ticks = TimeZoneManager.Now.Ticks;
+
+                    table.SetToStrField(entity);
+
+                    var forbidden = new Forbidden(graph, entity);
+
+                    new SqlPreCommandSimple(sqlSingle, InsertParameters(entity, forbidden, "")).ExecuteNonQuery();
+
+                    entity.IsNew = false;
+                    if (table.saveCollections.Value != null)
+                        table.saveCollections.Value.InsertCollections(new List<EntityForbidden> { new EntityForbidden(entity, forbidden) });
+                };
+            }
+
+
+
+            Action<List<Entity>, DirectedGraph<Entity>?> GetInsertMultiDisableIdentity(int num)
+            {
+                string sqlMulti = Enumerable.Range(0, num).ToString(i => SqlInsertPattern(i.ToString()), ";\r\n");
+
+                return (entities, graph) =>
+                {
+                    for (int i = 0; i < num; i++)
+                    {
+                        var entity = entities[i];
+                        AssertHasId(entity);
+
+                        entity.Ticks = TimeZoneManager.Now.Ticks;
+
+                        table.SetToStrField(entity);
+                    }
+
+                    List<DbParameter> result = new List<DbParameter>();
+                    for (int i = 0; i < entities.Count; i++)
+                        result.AddRange(InsertParameters(entities[i], new Forbidden(graph, entities[i]), i.ToString()));
+
+                    new SqlPreCommandSimple(sqlMulti, result).ExecuteNonQuery();
+                    for (int i = 0; i < num; i++)
+                    {
+                        Entity ident = entities[i];
+
+                        ident.IsNew = false;
+                    }
+
+                    if (table.saveCollections.Value != null)
+                        table.saveCollections.Value.InsertCollections(entities.Select(e => new EntityForbidden(e, graph)).ToList());
+                };
+            }
+
+            internal static InsertCacheDisableIdentity InitializeInsertDisableIdentity(Table table)
+            {
+                using (HeavyProfiler.LogNoStackTrace("InitializeInsertDisableIdentity", () => table.Type.TypeName()))
+                {
+                    var trios = new List<Table.Trio>();
+                    var assigments = new List<Expression>();
+                    var paramIdent = Expression.Parameter(typeof(object) /*Entity*/, "ident");
+                    var paramForbidden = Expression.Parameter(typeof(Forbidden), "forbidden");
+                    var paramSuffix = Expression.Parameter(typeof(string), "suffix");
+
+                    var cast = Expression.Parameter(table.Type, "casted");
+                    assigments.Add(Expression.Assign(cast, Expression.Convert(paramIdent, table.Type)));
+
+                    foreach (var item in table.Fields.Values)
+                        item.Field.CreateParameter(trios, assigments, Expression.Field(cast, item.FieldInfo), paramForbidden, paramSuffix);
+
+                    if (table.Mixins != null)
+                        foreach (var item in table.Mixins.Values)
+                            item.CreateParameter(trios, assigments, cast, paramForbidden, paramSuffix);
+
+                    Func<string, string> insertPattern = (suffix) =>
+                        "INSERT {0} ({1})\r\n VALUES ({2})".FormatWith(table.Name,
+                        trios.ToString(p => p.SourceColumn.SqlEscape(), ", "),
+                        trios.ToString(p => p.ParameterName + suffix, ", "));
+
+                    var expr = Expression.Lambda<Func<object, Forbidden, string, List<DbParameter>>>(
+                        CreateBlock(trios.Select(a => a.ParameterBuilder), assigments), paramIdent, paramForbidden, paramSuffix);
+
+                    
+                    return new InsertCacheDisableIdentity(table, insertPattern, expr.Compile());
+                }
+            }
+        }
+
+        class InsertCacheIdentity
+        {
+            internal Table table;
+
+            public Func<string, bool, string> SqlInsertPattern;
+            public Func<Entity, Forbidden, string, List<DbParameter>> InsertParameters;
+
+            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>> insertIdentityCache =
                new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>>();
 
             public InsertCacheIdentity(Table table, Func<string, bool, string> sqlInsertPattern, Func<Entity, Forbidden, string, List<DbParameter>> insertParameters)
@@ -224,152 +224,152 @@ public InsertCacheIdentity(Table table, Func<string, bool, string> sqlInsertPatt
                 InsertParameters = insertParameters;
             }
 
-            internal Action<List<Entity>, DirectedGraph<Entity>?> GetInserter(int numElements)
-            {
-                return insertIdentityCache.GetOrAdd(numElements, (int num) => GetInsertMultiIdentity(num));
-            }
-
-            Action<List<Entity>, DirectedGraph<Entity>?> GetInsertMultiIdentity(int num)
-            {
-                string sqlMulti = new StringBuilder()
-                    .AppendLine("DECLARE @MyTable TABLE (Id " + this.table.PrimaryKey.SqlDbType.ToString().ToUpperInvariant() + ");")
-                    .AppendLines(Enumerable.Range(0, num).Select(i => SqlInsertPattern(i.ToString(), true)))
-                    .AppendLine("SELECT Id from @MyTable").ToString();
-
-                return (entities, graph) =>
-                {
-                    for (int i = 0; i < num; i++)
-                    {
-                        var entity = entities[i];
-                        AssertNoId(entity);
-
-                        entity.Ticks = TimeZoneManager.Now.Ticks;
-
-                        table.SetToStrField(entity);
-                    }
-
-                    List<DbParameter> result = new List<DbParameter>();
-                    for (int i = 0; i < entities.Count; i++)
-                        result.AddRange(InsertParameters(entities[i], new Forbidden(graph, entities[i]), i.ToString()));
-
-                    DataTable dt = new SqlPreCommandSimple(sqlMulti, result).ExecuteDataTable();
-
-                    for (int i = 0; i < num; i++)
-                    {
-                        Entity ident = entities[i];
-
-                        ident.id = new PrimaryKey((IComparable)dt.Rows[i][0]);
-                        ident.IsNew = false;
-                    }
-
-                    if (table.saveCollections.Value != null)
-                        table.saveCollections.Value.InsertCollections(entities.Select(e => new EntityForbidden(e, graph)).ToList());
-                };
-
-            }
-
-            internal static InsertCacheIdentity InitializeInsertIdentity(Table table)
-            {
-                using (HeavyProfiler.LogNoStackTrace("InitializeInsertIdentity", () => table.Type.TypeName()))
-                {
-                    var trios = new List<Table.Trio>();
-                    var assigments = new List<Expression>();
-                    var paramIdent = Expression.Parameter(typeof(Entity), "ident");
-                    var paramForbidden = Expression.Parameter(typeof(Forbidden), "forbidden");
-                    var paramSuffix = Expression.Parameter(typeof(string), "suffix");
-
-                    var cast = Expression.Parameter(table.Type, "casted");
-                    assigments.Add(Expression.Assign(cast, Expression.Convert(paramIdent, table.Type)));
-
-                    foreach (var item in table.Fields.Values.Where(a => !(a.Field is FieldPrimaryKey)))
-                        item.Field.CreateParameter(trios, assigments, Expression.Field(cast, item.FieldInfo), paramForbidden, paramSuffix);
-
-                    if (table.Mixins != null)
-                        foreach (var item in table.Mixins.Values)
-                            item.CreateParameter(trios, assigments, cast, paramForbidden, paramSuffix);
-
-                    Func<string, bool, string> sqlInsertPattern = (suffix, output) =>
-                        "INSERT {0} ({1})\r\n{2} VALUES ({3})".FormatWith(table.Name,
-                        trios.ToString(p => p.SourceColumn.SqlEscape(), ", "),
-                        output ? "OUTPUT INSERTED.Id into @MyTable \r\n" : null,
-                        trios.ToString(p => p.ParameterName + suffix, ", "));
-
-
-                    var expr = Expression.Lambda<Func<Entity, Forbidden, string, List<DbParameter>>>(
-                        CreateBlock(trios.Select(a => a.ParameterBuilder), assigments), paramIdent, paramForbidden, paramSuffix);
-                    
-                    return new InsertCacheIdentity(table, sqlInsertPattern, expr.Compile());
-                }
-            }
+            internal Action<List<Entity>, DirectedGraph<Entity>?> GetInserter(int numElements)
+            {
+                return insertIdentityCache.GetOrAdd(numElements, (int num) => GetInsertMultiIdentity(num));
+            }
+
+            Action<List<Entity>, DirectedGraph<Entity>?> GetInsertMultiIdentity(int num)
+            {
+                string sqlMulti = new StringBuilder()
+                    .AppendLine("DECLARE @MyTable TABLE (Id " + this.table.PrimaryKey.SqlDbType.ToString().ToUpperInvariant() + ");")
+                    .AppendLines(Enumerable.Range(0, num).Select(i => SqlInsertPattern(i.ToString(), true)))
+                    .AppendLine("SELECT Id from @MyTable").ToString();
+
+                return (entities, graph) =>
+                {
+                    for (int i = 0; i < num; i++)
+                    {
+                        var entity = entities[i];
+                        AssertNoId(entity);
+
+                        entity.Ticks = TimeZoneManager.Now.Ticks;
+
+                        table.SetToStrField(entity);
+                    }
+
+                    List<DbParameter> result = new List<DbParameter>();
+                    for (int i = 0; i < entities.Count; i++)
+                        result.AddRange(InsertParameters(entities[i], new Forbidden(graph, entities[i]), i.ToString()));
+
+                    DataTable dt = new SqlPreCommandSimple(sqlMulti, result).ExecuteDataTable();
+
+                    for (int i = 0; i < num; i++)
+                    {
+                        Entity ident = entities[i];
+
+                        ident.id = new PrimaryKey((IComparable)dt.Rows[i][0]);
+                        ident.IsNew = false;
+                    }
+
+                    if (table.saveCollections.Value != null)
+                        table.saveCollections.Value.InsertCollections(entities.Select(e => new EntityForbidden(e, graph)).ToList());
+                };
+
+            }
+
+            internal static InsertCacheIdentity InitializeInsertIdentity(Table table)
+            {
+                using (HeavyProfiler.LogNoStackTrace("InitializeInsertIdentity", () => table.Type.TypeName()))
+                {
+                    var trios = new List<Table.Trio>();
+                    var assigments = new List<Expression>();
+                    var paramIdent = Expression.Parameter(typeof(Entity), "ident");
+                    var paramForbidden = Expression.Parameter(typeof(Forbidden), "forbidden");
+                    var paramSuffix = Expression.Parameter(typeof(string), "suffix");
+
+                    var cast = Expression.Parameter(table.Type, "casted");
+                    assigments.Add(Expression.Assign(cast, Expression.Convert(paramIdent, table.Type)));
+
+                    foreach (var item in table.Fields.Values.Where(a => !(a.Field is FieldPrimaryKey)))
+                        item.Field.CreateParameter(trios, assigments, Expression.Field(cast, item.FieldInfo), paramForbidden, paramSuffix);
+
+                    if (table.Mixins != null)
+                        foreach (var item in table.Mixins.Values)
+                            item.CreateParameter(trios, assigments, cast, paramForbidden, paramSuffix);
+
+                    Func<string, bool, string> sqlInsertPattern = (suffix, output) =>
+                        "INSERT {0} ({1})\r\n{2} VALUES ({3})".FormatWith(table.Name,
+                        trios.ToString(p => p.SourceColumn.SqlEscape(), ", "),
+                        output ? "OUTPUT INSERTED.Id into @MyTable \r\n" : null,
+                        trios.ToString(p => p.ParameterName + suffix, ", "));
+
+
+                    var expr = Expression.Lambda<Func<Entity, Forbidden, string, List<DbParameter>>>(
+                        CreateBlock(trios.Select(a => a.ParameterBuilder), assigments), paramIdent, paramForbidden, paramSuffix);
+                    
+                    return new InsertCacheIdentity(table, sqlInsertPattern, expr.Compile());
+                }
+            }
+        }
+
+        static void AssertHasId(Entity ident)
+        {
+            if (ident.IdOrNull == null)
+                throw new InvalidOperationException("{0} should have an Id, since the table has no Identity".FormatWith(ident, ident.IdOrNull));
+        }
+
+        static void AssertNoId(Entity ident)
+        {
+            if (ident.IdOrNull != null)
+                throw new InvalidOperationException("{0} is new, but has Id {1}".FormatWith(ident, ident.IdOrNull));
+        }
+
+
+        public IColumn? ToStrColumn
+        {
+            get
+            {
+
+                if (Fields.TryGetValue("toStr", out EntityField entity))
+                    return (IColumn)entity.Field;
+
+                return null;
+            }
         }
-
-        static void AssertHasId(Entity ident)
-        {
-            if (ident.IdOrNull == null)
-                throw new InvalidOperationException("{0} should have an Id, since the table has no Identity".FormatWith(ident, ident.IdOrNull));
-        }
-
-        static void AssertNoId(Entity ident)
-        {
-            if (ident.IdOrNull != null)
-                throw new InvalidOperationException("{0} is new, but has Id {1}".FormatWith(ident, ident.IdOrNull));
-        }
-
-
-        public IColumn? ToStrColumn
-        {
-            get
-            {
-
-                if (Fields.TryGetValue("toStr", out EntityField entity))
-                    return (IColumn)entity.Field;
-
-                return null;
-            }
-        }
-
-        internal bool SetToStrField(Entity entity)
-        {
-            var toStrColumn = ToStrColumn;
-            if (toStrColumn != null)
-            {
-                string newStr;
-                using (CultureInfoUtils.ChangeCultureUI(Schema.Current.ForceCultureInfo))
-                    newStr = entity.ToString();
-
-                if (newStr.HasText() && toStrColumn.Size.HasValue && newStr.Length > toStrColumn.Size)
-                    newStr = newStr.Substring(0, toStrColumn.Size.Value);
-
-                if (entity.toStr != newStr)
-                {
-                    entity.toStr = newStr;
-                    return true;
-                }
-            }
-
-            return false;
-        }
-
-
-        internal static FieldInfo fiId = ReflectionTools.GetFieldInfo((Entity i) => i.id);
-
-        internal void UpdateMany(List<Entity> list, DirectedGraph<Entity>? backEdges)
-        {
-            using (HeavyProfiler.LogNoStackTrace("UpdateMany", () => this.Type.TypeName()))
-            {
-                var uc = updater.Value;
-                list.SplitStatements(this.Columns.Count + 2, ls => uc.GetUpdater(ls.Count)(ls, backEdges));
-            }
-        }
-
-        class UpdateCache
-        {
-            internal Table table;
-
-            public Func<string, bool, string> SqlUpdatePattern;
-            public Func<Entity, long, Forbidden, string, List<DbParameter>> UpdateParameters;
-
-            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>> updateCache =
+
+        internal bool SetToStrField(Entity entity)
+        {
+            var toStrColumn = ToStrColumn;
+            if (toStrColumn != null)
+            {
+                string newStr;
+                using (CultureInfoUtils.ChangeCultureUI(Schema.Current.ForceCultureInfo))
+                    newStr = entity.ToString();
+
+                if (newStr.HasText() && toStrColumn.Size.HasValue && newStr.Length > toStrColumn.Size)
+                    newStr = newStr.Substring(0, toStrColumn.Size.Value);
+
+                if (entity.toStr != newStr)
+                {
+                    entity.toStr = newStr;
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+
+        internal static FieldInfo fiId = ReflectionTools.GetFieldInfo((Entity i) => i.id);
+
+        internal void UpdateMany(List<Entity> list, DirectedGraph<Entity>? backEdges)
+        {
+            using (HeavyProfiler.LogNoStackTrace("UpdateMany", () => this.Type.TypeName()))
+            {
+                var uc = updater.Value;
+                list.SplitStatements(this.Columns.Count + 2, ls => uc.GetUpdater(ls.Count)(ls, backEdges));
+            }
+        }
+
+        class UpdateCache
+        {
+            internal Table table;
+
+            public Func<string, bool, string> SqlUpdatePattern;
+            public Func<Entity, long, Forbidden, string, List<DbParameter>> UpdateParameters;
+
+            ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>> updateCache =
                 new ConcurrentDictionary<int, Action<List<Entity>, DirectedGraph<Entity>?>>();
 
             public UpdateCache(Table table, Func<string, bool, string> sqlUpdatePattern, Func<Entity, long, Forbidden, string, List<DbParameter>> updateParameters)
@@ -377,189 +377,189 @@ public UpdateCache(Table table, Func<string, bool, string> sqlUpdatePattern, Fun
                 this.table = table;
                 SqlUpdatePattern = sqlUpdatePattern;
                 UpdateParameters = updateParameters;
-            }
-
-            public Action<List<Entity>, DirectedGraph<Entity>?> GetUpdater(int numElements)
-            {
-                return updateCache.GetOrAdd(numElements, num => num == 1 ? GenerateUpdate() : GetUpdateMultiple(num));
-            }
-
-            Action<List<Entity>, DirectedGraph<Entity>?> GenerateUpdate()
-            {
-                string sqlUpdate = SqlUpdatePattern("", false);
-
-                if (table.Ticks != null)
-                {
-                    return (uniList, graph) =>
-                    {
-                        Entity ident = uniList.Single();
-                        Entity entity = (Entity)ident;
-
-                        long oldTicks = entity.Ticks;
-                        entity.Ticks = TimeZoneManager.Now.Ticks;
-
-                        table.SetToStrField(ident);
-
-                        var forbidden = new Forbidden(graph, ident);
-
-                        int num = (int)new SqlPreCommandSimple(sqlUpdate, UpdateParameters(ident, oldTicks, forbidden, "")).ExecuteNonQuery();
-                        if (num != 1)
-                            throw new ConcurrencyException(ident.GetType(), ident.Id);
-
-                        if (table.saveCollections.Value != null)
-                            table.saveCollections.Value.UpdateCollections(new List<EntityForbidden> { new EntityForbidden(ident, forbidden) });
-                    };
-                }
-                else
-                {
-                    return (uniList, graph) =>
-                    {
-                        Entity ident = uniList.Single();
-
-                        table.SetToStrField(ident);
-
-                        var forbidden = new Forbidden(graph, ident);
-
-                        int num = (int)new SqlPreCommandSimple(sqlUpdate, UpdateParameters(ident, -1, forbidden, "")).ExecuteNonQuery();
-                        if (num != 1)
-                            throw new EntityNotFoundException(ident.GetType(), ident.Id);
-                    };
-                }
-            }
-
-            Action<List<Entity>, DirectedGraph<Entity>?> GetUpdateMultiple(int num)
-            {
-                string sqlMulti = new StringBuilder()
-                      .AppendLine("DECLARE @NotFound TABLE (Id " + this.table.PrimaryKey.SqlDbType.ToString().ToUpperInvariant() + ");")
-                      .AppendLines(Enumerable.Range(0, num).Select(i => SqlUpdatePattern(i.ToString(), true)))
-                      .AppendLine("SELECT Id from @NotFound").ToString();
-
-                if (table.Ticks != null)
-                {
-                    return (idents, graph) =>
-                    {
-                        List<DbParameter> parameters = new List<DbParameter>();
-                        for (int i = 0; i < num; i++)
-                        {
-                            Entity entity = (Entity)idents[i];
-
-                            long oldTicks = entity.Ticks;
-                            entity.Ticks = TimeZoneManager.Now.Ticks;
-
-                            parameters.AddRange(UpdateParameters(entity, oldTicks, new Forbidden(graph, entity), i.ToString()));
-                        }
-
-                        DataTable dt = new SqlPreCommandSimple(sqlMulti, parameters).ExecuteDataTable();
-
-                        if (dt.Rows.Count > 0)
-                            throw new ConcurrencyException(table.Type, dt.Rows.Cast<DataRow>().Select(r => new PrimaryKey((IComparable)r[0])).ToArray());
-
-                        if (table.saveCollections.Value != null)
-                            table.saveCollections.Value.UpdateCollections(idents.Select(e => new EntityForbidden(e, new Forbidden(graph, e))).ToList());
-                    };
-                }
-                else
-                {
-                    return (idents, graph) =>
-                    {
-                        List<DbParameter> parameters = new List<DbParameter>();
-                        for (int i = 0; i < num; i++)
-                        {
-                            var ident = idents[i];
-                            parameters.AddRange(UpdateParameters(ident, -1, new Forbidden(graph, ident), i.ToString()));
-                        }
-
-                        DataTable dt = new SqlPreCommandSimple(sqlMulti, parameters).ExecuteDataTable();
-
-                        if (dt.Rows.Count > 0)
-                            throw new EntityNotFoundException(table.Type, dt.Rows.Cast<DataRow>().Select(r => new PrimaryKey((IComparable)r[0])).ToArray());
-
-                        for (int i = 0; i < num; i++)
-                        {
-                            Entity ident = idents[i];
-                        }
-
-                        if (table.saveCollections.Value != null)
-                            table.saveCollections.Value.UpdateCollections(idents.Select(e => new EntityForbidden(e, new Forbidden(graph, e))).ToList());
-                    };
-                }
-            }
-
-            internal static UpdateCache InitializeUpdate(Table table)
-            {
-                using (HeavyProfiler.LogNoStackTrace("InitializeUpdate", () => table.Type.TypeName()))
-                {
-                    var trios = new List<Trio>();
-                    var assigments = new List<Expression>();
-                    var paramIdent = Expression.Parameter(typeof(Entity), "ident");
-                    var paramForbidden = Expression.Parameter(typeof(Forbidden), "forbidden");
-                    var paramOldTicks = Expression.Parameter(typeof(long), "oldTicks");
-                    var paramSuffix = Expression.Parameter(typeof(string), "suffix");
-
-                    var cast = Expression.Parameter(table.Type);
-                    assigments.Add(Expression.Assign(cast, Expression.Convert(paramIdent, table.Type)));
-
-                    foreach (var item in table.Fields.Values.Where(a => !(a.Field is FieldPrimaryKey)))
-                        item.Field.CreateParameter(trios, assigments, Expression.Field(cast, item.FieldInfo), paramForbidden, paramSuffix);
-
-                    if (table.Mixins != null)
-                        foreach (var item in table.Mixins.Values)
-                            item.CreateParameter(trios, assigments, cast, paramForbidden, paramSuffix);
-
-                    var pb = Connector.Current.ParameterBuilder;
-
-                    string idParamName = ParameterBuilder.GetParameterName("id");
-
-                    string oldTicksParamName = ParameterBuilder.GetParameterName("old_ticks");
-
-                    Func<string, bool, string> sqlUpdatePattern = (suffix, output) =>
-                    {
-                        string update = "UPDATE {0} SET \r\n{1}\r\n WHERE {2} = {3}".FormatWith(
-                            table.Name,
-                            trios.ToString(p => "{0} = {1}".FormatWith(p.SourceColumn.SqlEscape(), p.ParameterName + suffix).Indent(2), ",\r\n"),
-                            table.PrimaryKey.Name.SqlEscape(),
-                            idParamName + suffix);
-
-
-                        if (table.Ticks != null)
-                            update += " AND {0} = {1}".FormatWith(table.Ticks.Name.SqlEscape(), oldTicksParamName + suffix);
-
-                        if (!output)
-                            return update;
-                        else
-                            return update + "\r\nIF @@ROWCOUNT = 0 INSERT INTO @NotFound (id) VALUES ({0})".FormatWith(idParamName + suffix);
-                    };
-
-                    List<Expression> parameters = new List<Expression>();
-
-                    parameters.Add(pb.ParameterFactory(Trio.Concat(idParamName, paramSuffix), table.PrimaryKey.SqlDbType, null, false,
-                        Expression.Field(Expression.Property(Expression.Field(paramIdent, fiId), "Value"), "Object")));
-
-                    if (table.Ticks != null)
-                    {
-                        parameters.Add(pb.ParameterFactory(Trio.Concat(oldTicksParamName, paramSuffix), table.Ticks.SqlDbType, null, false, table.Ticks.ConvertTicks(paramOldTicks)));
-                    }
-
-                    parameters.AddRange(trios.Select(a => (Expression)a.ParameterBuilder));
-
-                    var expr = Expression.Lambda<Func<Entity, long, Forbidden, string, List<DbParameter>>>(
-                        CreateBlock(parameters, assigments), paramIdent, paramOldTicks, paramForbidden, paramSuffix);
-
-                    
-                    return new UpdateCache(table, sqlUpdatePattern, expr.Compile());
-                }
-            }
-
-        }
-
-        ResetLazy<UpdateCache> updater;
-
-
-        class CollectionsCache
-        {
-            public Func<Entity, string, bool, SqlPreCommand> InsertCollectionsSync;
-
-            public Action<List<EntityForbidden>> InsertCollections;
+            }
+
+            public Action<List<Entity>, DirectedGraph<Entity>?> GetUpdater(int numElements)
+            {
+                return updateCache.GetOrAdd(numElements, num => num == 1 ? GenerateUpdate() : GetUpdateMultiple(num));
+            }
+
+            Action<List<Entity>, DirectedGraph<Entity>?> GenerateUpdate()
+            {
+                string sqlUpdate = SqlUpdatePattern("", false);
+
+                if (table.Ticks != null)
+                {
+                    return (uniList, graph) =>
+                    {
+                        Entity ident = uniList.Single();
+                        Entity entity = (Entity)ident;
+
+                        long oldTicks = entity.Ticks;
+                        entity.Ticks = TimeZoneManager.Now.Ticks;
+
+                        table.SetToStrField(ident);
+
+                        var forbidden = new Forbidden(graph, ident);
+
+                        int num = (int)new SqlPreCommandSimple(sqlUpdate, UpdateParameters(ident, oldTicks, forbidden, "")).ExecuteNonQuery();
+                        if (num != 1)
+                            throw new ConcurrencyException(ident.GetType(), ident.Id);
+
+                        if (table.saveCollections.Value != null)
+                            table.saveCollections.Value.UpdateCollections(new List<EntityForbidden> { new EntityForbidden(ident, forbidden) });
+                    };
+                }
+                else
+                {
+                    return (uniList, graph) =>
+                    {
+                        Entity ident = uniList.Single();
+
+                        table.SetToStrField(ident);
+
+                        var forbidden = new Forbidden(graph, ident);
+
+                        int num = (int)new SqlPreCommandSimple(sqlUpdate, UpdateParameters(ident, -1, forbidden, "")).ExecuteNonQuery();
+                        if (num != 1)
+                            throw new EntityNotFoundException(ident.GetType(), ident.Id);
+                    };
+                }
+            }
+
+            Action<List<Entity>, DirectedGraph<Entity>?> GetUpdateMultiple(int num)
+            {
+                string sqlMulti = new StringBuilder()
+                      .AppendLine("DECLARE @NotFound TABLE (Id " + this.table.PrimaryKey.SqlDbType.ToString().ToUpperInvariant() + ");")
+                      .AppendLines(Enumerable.Range(0, num).Select(i => SqlUpdatePattern(i.ToString(), true)))
+                      .AppendLine("SELECT Id from @NotFound").ToString();
+
+                if (table.Ticks != null)
+                {
+                    return (idents, graph) =>
+                    {
+                        List<DbParameter> parameters = new List<DbParameter>();
+                        for (int i = 0; i < num; i++)
+                        {
+                            Entity entity = (Entity)idents[i];
+
+                            long oldTicks = entity.Ticks;
+                            entity.Ticks = TimeZoneManager.Now.Ticks;
+
+                            parameters.AddRange(UpdateParameters(entity, oldTicks, new Forbidden(graph, entity), i.ToString()));
+                        }
+
+                        DataTable dt = new SqlPreCommandSimple(sqlMulti, parameters).ExecuteDataTable();
+
+                        if (dt.Rows.Count > 0)
+                            throw new ConcurrencyException(table.Type, dt.Rows.Cast<DataRow>().Select(r => new PrimaryKey((IComparable)r[0])).ToArray());
+
+                        if (table.saveCollections.Value != null)
+                            table.saveCollections.Value.UpdateCollections(idents.Select(e => new EntityForbidden(e, new Forbidden(graph, e))).ToList());
+                    };
+                }
+                else
+                {
+                    return (idents, graph) =>
+                    {
+                        List<DbParameter> parameters = new List<DbParameter>();
+                        for (int i = 0; i < num; i++)
+                        {
+                            var ident = idents[i];
+                            parameters.AddRange(UpdateParameters(ident, -1, new Forbidden(graph, ident), i.ToString()));
+                        }
+
+                        DataTable dt = new SqlPreCommandSimple(sqlMulti, parameters).ExecuteDataTable();
+
+                        if (dt.Rows.Count > 0)
+                            throw new EntityNotFoundException(table.Type, dt.Rows.Cast<DataRow>().Select(r => new PrimaryKey((IComparable)r[0])).ToArray());
+
+                        for (int i = 0; i < num; i++)
+                        {
+                            Entity ident = idents[i];
+                        }
+
+                        if (table.saveCollections.Value != null)
+                            table.saveCollections.Value.UpdateCollections(idents.Select(e => new EntityForbidden(e, new Forbidden(graph, e))).ToList());
+                    };
+                }
+            }
+
+            internal static UpdateCache InitializeUpdate(Table table)
+            {
+                using (HeavyProfiler.LogNoStackTrace("InitializeUpdate", () => table.Type.TypeName()))
+                {
+                    var trios = new List<Trio>();
+                    var assigments = new List<Expression>();
+                    var paramIdent = Expression.Parameter(typeof(Entity), "ident");
+                    var paramForbidden = Expression.Parameter(typeof(Forbidden), "forbidden");
+                    var paramOldTicks = Expression.Parameter(typeof(long), "oldTicks");
+                    var paramSuffix = Expression.Parameter(typeof(string), "suffix");
+
+                    var cast = Expression.Parameter(table.Type);
+                    assigments.Add(Expression.Assign(cast, Expression.Convert(paramIdent, table.Type)));
+
+                    foreach (var item in table.Fields.Values.Where(a => !(a.Field is FieldPrimaryKey)))
+                        item.Field.CreateParameter(trios, assigments, Expression.Field(cast, item.FieldInfo), paramForbidden, paramSuffix);
+
+                    if (table.Mixins != null)
+                        foreach (var item in table.Mixins.Values)
+                            item.CreateParameter(trios, assigments, cast, paramForbidden, paramSuffix);
+
+                    var pb = Connector.Current.ParameterBuilder;
+
+                    string idParamName = ParameterBuilder.GetParameterName("id");
+
+                    string oldTicksParamName = ParameterBuilder.GetParameterName("old_ticks");
+
+                    Func<string, bool, string> sqlUpdatePattern = (suffix, output) =>
+                    {
+                        string update = "UPDATE {0} SET \r\n{1}\r\n WHERE {2} = {3}".FormatWith(
+                            table.Name,
+                            trios.ToString(p => "{0} = {1}".FormatWith(p.SourceColumn.SqlEscape(), p.ParameterName + suffix).Indent(2), ",\r\n"),
+                            table.PrimaryKey.Name.SqlEscape(),
+                            idParamName + suffix);
+
+
+                        if (table.Ticks != null)
+                            update += " AND {0} = {1}".FormatWith(table.Ticks.Name.SqlEscape(), oldTicksParamName + suffix);
+
+                        if (!output)
+                            return update;
+                        else
+                            return update + "\r\nIF @@ROWCOUNT = 0 INSERT INTO @NotFound (id) VALUES ({0})".FormatWith(idParamName + suffix);
+                    };
+
+                    List<Expression> parameters = new List<Expression>();
+
+                    parameters.Add(pb.ParameterFactory(Trio.Concat(idParamName, paramSuffix), table.PrimaryKey.SqlDbType, null, false,
+                        Expression.Field(Expression.Property(Expression.Field(paramIdent, fiId), "Value"), "Object")));
+
+                    if (table.Ticks != null)
+                    {
+                        parameters.Add(pb.ParameterFactory(Trio.Concat(oldTicksParamName, paramSuffix), table.Ticks.SqlDbType, null, false, table.Ticks.ConvertTicks(paramOldTicks)));
+                    }
+
+                    parameters.AddRange(trios.Select(a => (Expression)a.ParameterBuilder));
+
+                    var expr = Expression.Lambda<Func<Entity, long, Forbidden, string, List<DbParameter>>>(
+                        CreateBlock(parameters, assigments), paramIdent, paramOldTicks, paramForbidden, paramSuffix);
+
+                    
+                    return new UpdateCache(table, sqlUpdatePattern, expr.Compile());
+                }
+            }
+
+        }
+
+        ResetLazy<UpdateCache> updater;
+
+
+        class CollectionsCache
+        {
+            public Func<Entity, string, bool, SqlPreCommand> InsertCollectionsSync;
+
+            public Action<List<EntityForbidden>> InsertCollections;
             public Action<List<EntityForbidden>> UpdateCollections;
 
             public CollectionsCache(Func<Entity, string, bool, SqlPreCommand> insertCollectionsSync, 
@@ -571,889 +571,889 @@ public CollectionsCache(Func<Entity, string, bool, SqlPreCommand> insertCollecti
                 UpdateCollections = updateCollections;
             }
 
-            internal static CollectionsCache? InitializeCollections(Table table)
-            {
-                using (HeavyProfiler.LogNoStackTrace("InitializeCollections", () => table.Type.TypeName()))
-                {
-                    var caches =
-                        (from rt in table.TablesMList()
-                         select rt.cache.Value).ToList();
-
-                    if (caches.IsEmpty())
-                        return null;
-                    else
-                    {
+            internal static CollectionsCache? InitializeCollections(Table table)
+            {
+                using (HeavyProfiler.LogNoStackTrace("InitializeCollections", () => table.Type.TypeName()))
+                {
+                    var caches =
+                        (from rt in table.TablesMList()
+                         select rt.cache.Value).ToList();
+
+                    if (caches.IsEmpty())
+                        return null;
+                    else
+                    {
                         return new CollectionsCache(
-                            insertCollections: (entities) =>
-                            {
-                                foreach (var rc in caches)
-                                    rc.RelationalInserts(entities);
+                            insertCollections: (entities) =>
+                            {
+                                foreach (var rc in caches)
+                                    rc.RelationalInserts(entities);
                             },
                             updateCollections: (entities) =>
                            {
                                foreach (var rc in caches)
                                    rc.RelationalUpdates(entities);
                            },
-                            insertCollectionsSync: (ident, suffix, replaceParameter) =>
-                                caches.Select((rc, i) => rc.RelationalUpdateSync(ident, suffix + "_" + i.ToString(), replaceParameter)).Combine(Spacing.Double)!
-                        );
-                    }
-                }
-            }
-        }
-
-        ResetLazy<CollectionsCache?> saveCollections;
-
-
-        public SqlPreCommand InsertSqlSync(Entity ident, bool includeCollections = true, string? comment = null, string suffix = "")
-        {
-            PrepareEntitySync(ident);
-            SetToStrField(ident);
-
-            SqlPreCommandSimple insert = IdentityBehaviour ?
-                new SqlPreCommandSimple(
-                    inserterIdentity.Value.SqlInsertPattern(suffix, false),
-                    inserterIdentity.Value.InsertParameters(ident, new Forbidden(), suffix)).AddComment(comment) :
-                new SqlPreCommandSimple(
-                    inserterDisableIdentity.Value.SqlInsertPattern(suffix),
-                    inserterDisableIdentity.Value.InsertParameters(ident, new Forbidden(), suffix)).AddComment(comment);
-
-            if (!includeCollections)
-                return insert;
-
-            var cc = saveCollections.Value;
-            if (cc == null)
-                return insert;
-
-            SqlPreCommand collections = cc.InsertCollectionsSync((Entity)ident, suffix, false);
-
-            if (collections == null)
-                return insert;
-
-            SqlPreCommand declareParent = new SqlPreCommandSimple("DECLARE @parentId INT") { GoBefore = true };
-
-            SqlPreCommand setParent = new SqlPreCommandSimple("SET @parentId = @@Identity");
-
-            return SqlPreCommand.Combine(Spacing.Simple, declareParent, insert, setParent, collections)!;
-        }
-
-        public SqlPreCommand? UpdateSqlSync<T>(T entity, Expression<Func<T, bool>>? where, bool includeCollections = true, string? comment = null, string suffix = "")
-            where T : Entity
-        {
-            if (typeof(T) != Type && where != null)
-                throw new InvalidOperationException("Invalid table");
-
-            PrepareEntitySync(entity);
-
-            if (SetToStrField(entity))
-                entity.SetSelfModified();
-
-            if (entity.Modified == ModifiedState.Clean || entity.Modified == ModifiedState.Sealed)
-                return null;
-
-            var uc = updater.Value;
-            var sql = uc.SqlUpdatePattern(suffix, false);
-            var parameters = uc.UpdateParameters(entity, (entity as Entity)?.Ticks ?? -1, new Forbidden(), suffix);
-
-            SqlPreCommand? update;
-            if (where != null)
-            {
-                update = SqlPreCommand.Combine(Spacing.Simple,
-                    DeclarePrimaryKeyVariable(entity, where),
-                    new SqlPreCommandSimple(sql, parameters).AddComment(comment).ReplaceFirstParameter(entity.Id.VariableName));
-            }
-            else
-            {
-                update = new SqlPreCommandSimple(sql, parameters).AddComment(comment);
-            }
-
-            if (!includeCollections)
-                return update;
-
-            var cc = saveCollections.Value;
-            if (cc == null)
-                return update;
-
-            SqlPreCommand collections = cc.InsertCollectionsSync((Entity)entity, suffix, where != null);
-
-            return SqlPreCommand.Combine(Spacing.Simple, update, collections);
-        }
-
-        void PrepareEntitySync(Entity entity)
-        {
-            Schema current = Schema.Current;
-            DirectedGraph<Modifiable> modifiables = Saver.PreSaving(() => GraphExplorer.FromRoot(entity));
-
-            var error = GraphExplorer.FullIntegrityCheck(modifiables);
-            if (error != null)
-            {
-#if DEBUG
-                throw new IntegrityCheckException(error.WithEntities(modifiables));
-#else
-                throw new IntegrityCheckException(error);
-#endif
-            }
-            GraphExplorer.PropagateModifications(modifiables.Inverse());
-        }
-
-        public class Trio
-        {
-            public Trio(IColumn column, Expression value, Expression suffix)
-            {
-                this.SourceColumn = column.Name;
-                this.ParameterName = Engine.ParameterBuilder.GetParameterName(column.Name);
-                this.ParameterBuilder = Connector.Current.ParameterBuilder.ParameterFactory(Concat(this.ParameterName, suffix), column.SqlDbType, column.UserDefinedTypeName, column.Nullable.ToBool(), value);
-            }
-
-            public string SourceColumn;
-            public string ParameterName;
-            public MemberInitExpression ParameterBuilder; //Expression<DbParameter>
-
-            public override string ToString()
-            {
-                return "{0} {1} {2}".FormatWith(SourceColumn, ParameterName, ParameterBuilder.ToString());
-            }
-
-            static MethodInfo miConcat = ReflectionTools.GetMethodInfo(() => string.Concat("", ""));
-
-            internal static Expression Concat(string baseName, Expression suffix)
-            {
-                return Expression.Call(null, miConcat, Expression.Constant(baseName), suffix);
-            }
-        }
-
-        static ConstructorInfo ciNewList = ReflectionTools.GetConstuctorInfo(() => new List<DbParameter>(1));
-
-        public static Expression CreateBlock(IEnumerable<Expression> parameters, IEnumerable<Expression> assigments)
-        {
-            return Expression.Block(assigments.OfType<BinaryExpression>().Select(a => (ParameterExpression)a.Left),
-                assigments.And(
-                Expression.ListInit(Expression.New(ciNewList, Expression.Constant(parameters.Count())),
-                parameters)));
-        }
-    }
-
-
-    public partial class TableMList
-    {
-        internal interface IMListCache
-        {
-            SqlPreCommand? RelationalUpdateSync(Entity parent, string suffix, bool replaceParameter);
-            void RelationalInserts(List<EntityForbidden> entities);
-            void RelationalUpdates(List<EntityForbidden> entities);
-
-            object[] BulkInsertDataRow(Entity entity, object value, int order);
+                            insertCollectionsSync: (ident, suffix, replaceParameter) =>
+                                caches.Select((rc, i) => rc.RelationalUpdateSync(ident, suffix + "_" + i.ToString(), replaceParameter)).Combine(Spacing.Double)!
+                        );
+                    }
+                }
+            }
+        }
+
+        ResetLazy<CollectionsCache?> saveCollections;
+
+
+        public SqlPreCommand InsertSqlSync(Entity ident, bool includeCollections = true, string? comment = null, string suffix = "")
+        {
+            PrepareEntitySync(ident);
+            SetToStrField(ident);
+
+            SqlPreCommandSimple insert = IdentityBehaviour ?
+                new SqlPreCommandSimple(
+                    inserterIdentity.Value.SqlInsertPattern(suffix, false),
+                    inserterIdentity.Value.InsertParameters(ident, new Forbidden(), suffix)).AddComment(comment) :
+                new SqlPreCommandSimple(
+                    inserterDisableIdentity.Value.SqlInsertPattern(suffix),
+                    inserterDisableIdentity.Value.InsertParameters(ident, new Forbidden(), suffix)).AddComment(comment);
+
+            if (!includeCollections)
+                return insert;
+
+            var cc = saveCollections.Value;
+            if (cc == null)
+                return insert;
+
+            SqlPreCommand collections = cc.InsertCollectionsSync((Entity)ident, suffix, false);
+
+            if (collections == null)
+                return insert;
+
+            SqlPreCommand declareParent = new SqlPreCommandSimple("DECLARE @parentId INT") { GoBefore = true };
+
+            SqlPreCommand setParent = new SqlPreCommandSimple("SET @parentId = @@Identity");
+
+            return SqlPreCommand.Combine(Spacing.Simple, declareParent, insert, setParent, collections)!;
+        }
+
+        public SqlPreCommand? UpdateSqlSync<T>(T entity, Expression<Func<T, bool>>? where, bool includeCollections = true, string? comment = null, string suffix = "")
+            where T : Entity
+        {
+            if (typeof(T) != Type && where != null)
+                throw new InvalidOperationException("Invalid table");
+
+            PrepareEntitySync(entity);
+
+            if (SetToStrField(entity))
+                entity.SetSelfModified();
+
+            if (entity.Modified == ModifiedState.Clean || entity.Modified == ModifiedState.Sealed)
+                return null;
+
+            var uc = updater.Value;
+            var sql = uc.SqlUpdatePattern(suffix, false);
+            var parameters = uc.UpdateParameters(entity, (entity as Entity)?.Ticks ?? -1, new Forbidden(), suffix);
+
+            SqlPreCommand? update;
+            if (where != null)
+            {
+                update = SqlPreCommand.Combine(Spacing.Simple,
+                    DeclarePrimaryKeyVariable(entity, where),
+                    new SqlPreCommandSimple(sql, parameters).AddComment(comment).ReplaceFirstParameter(entity.Id.VariableName));
+            }
+            else
+            {
+                update = new SqlPreCommandSimple(sql, parameters).AddComment(comment);
+            }
+
+            if (!includeCollections)
+                return update;
+
+            var cc = saveCollections.Value;
+            if (cc == null)
+                return update;
+
+            SqlPreCommand collections = cc.InsertCollectionsSync((Entity)entity, suffix, where != null);
+
+            return SqlPreCommand.Combine(Spacing.Simple, update, collections);
+        }
+
+        void PrepareEntitySync(Entity entity)
+        {
+            Schema current = Schema.Current;
+            DirectedGraph<Modifiable> modifiables = Saver.PreSaving(() => GraphExplorer.FromRoot(entity));
+
+            var error = GraphExplorer.FullIntegrityCheck(modifiables);
+            if (error != null)
+            {
+#if DEBUG
+                throw new IntegrityCheckException(error.WithEntities(modifiables));
+#else
+                throw new IntegrityCheckException(error);
+#endif
+            }
+            GraphExplorer.PropagateModifications(modifiables.Inverse());
+        }
+
+        public class Trio
+        {
+            public Trio(IColumn column, Expression value, Expression suffix)
+            {
+                this.SourceColumn = column.Name;
+                this.ParameterName = Engine.ParameterBuilder.GetParameterName(column.Name);
+                this.ParameterBuilder = Connector.Current.ParameterBuilder.ParameterFactory(Concat(this.ParameterName, suffix), column.SqlDbType, column.UserDefinedTypeName, column.Nullable.ToBool(), value);
+            }
+
+            public string SourceColumn;
+            public string ParameterName;
+            public MemberInitExpression ParameterBuilder; //Expression<DbParameter>
+
+            public override string ToString()
+            {
+                return "{0} {1} {2}".FormatWith(SourceColumn, ParameterName, ParameterBuilder.ToString());
+            }
+
+            static MethodInfo miConcat = ReflectionTools.GetMethodInfo(() => string.Concat("", ""));
+
+            internal static Expression Concat(string baseName, Expression suffix)
+            {
+                return Expression.Call(null, miConcat, Expression.Constant(baseName), suffix);
+            }
+        }
+
+        static ConstructorInfo ciNewList = ReflectionTools.GetConstuctorInfo(() => new List<DbParameter>(1));
+
+        public static Expression CreateBlock(IEnumerable<Expression> parameters, IEnumerable<Expression> assigments)
+        {
+            return Expression.Block(assigments.OfType<BinaryExpression>().Select(a => (ParameterExpression)a.Left),
+                assigments.And(
+                Expression.ListInit(Expression.New(ciNewList, Expression.Constant(parameters.Count())),
+                parameters)));
+        }
+    }
+
+
+    public partial class TableMList
+    {
+        internal interface IMListCache
+        {
+            SqlPreCommand? RelationalUpdateSync(Entity parent, string suffix, bool replaceParameter);
+            void RelationalInserts(List<EntityForbidden> entities);
+            void RelationalUpdates(List<EntityForbidden> entities);
+
+            object[] BulkInsertDataRow(Entity entity, object value, int order);
         }
 
 #pragma warning disable CS8618 // Non-nullable field is uninitialized.
         internal class TableMListCache<T> : IMListCache
 #pragma warning restore CS8618 // Non-nullable field is uninitialized.
-        {
-            internal TableMList table;
-
-            internal Func<string, string> sqlDelete;
-            public Func<Entity, string, DbParameter> DeleteParameter;
-            public ConcurrentDictionary<int, Action<List<Entity>>> deleteCache = new ConcurrentDictionary<int, Action<List<Entity>>>();
-
-            Action<List<Entity>> GetDelete(int numEntities)
-            {
-                return deleteCache.GetOrAdd(numEntities, num =>
-                {
-                    string sql = Enumerable.Range(0, num).ToString(i => sqlDelete(i.ToString()), ";\r\n");
-
-                    return list =>
-                    {
-                        List<DbParameter> parameters = new List<DbParameter>();
-                        for (int i = 0; i < num; i++)
-                        {
-                            parameters.Add(DeleteParameter(list[i], i.ToString()));
-                        }
-                        new SqlPreCommandSimple(sql, parameters).ExecuteNonQuery();
-                    };
-                });
-            }
-
-            internal Func<int, string> sqlDeleteExcept;
-            public Func<MListDelete, List<DbParameter>> DeleteExceptParameter;
-            public ConcurrentDictionary<int, Action<MListDelete>> deleteExceptCache = new ConcurrentDictionary<int, Action<MListDelete>>();
-
-            Action<MListDelete> GetDeleteExcept(int numExceptions)
-            {
-                return deleteExceptCache.GetOrAdd(numExceptions, num =>
-                {
-                    string sql = sqlDeleteExcept(numExceptions); Enumerable.Range(0, num).ToString(i => sqlDelete(i.ToString()), ";\r\n");
-
-                    return delete =>
-                    {
-                        new SqlPreCommandSimple(sql, DeleteExceptParameter(delete)).ExecuteNonQuery();
-                    };
-                });
-            }
-
-            public struct MListDelete
-            {
-                public readonly Entity Entity;
-                public readonly PrimaryKey[] ExceptRowIds;
-
-                public MListDelete(Entity ident, PrimaryKey[] exceptRowIds)
-                {
-                    this.Entity = ident;
-                    this.ExceptRowIds = exceptRowIds;
-                }
-            }
-
-            internal bool hasOrder = false;
-            internal bool isEmbeddedEntity = false;
-            internal Func<string, string> sqlUpdate;
-            public Func<Entity, PrimaryKey, T, int, Forbidden, string, List<DbParameter>> UpdateParameters;
-            public ConcurrentDictionary<int, Action<List<MListUpdate>>> updateCache =
-                new ConcurrentDictionary<int, Action<List<MListUpdate>>>();
-
-            Action<List<MListUpdate>> GetUpdate(int numElements)
-            {
-                return updateCache.GetOrAdd(numElements, num =>
-                {
-                    string sql = Enumerable.Range(0, num).ToString(i => sqlUpdate(i.ToString()), ";\r\n");
-
-                    return (List<MListUpdate> list) =>
-                    {
-                        List<DbParameter> parameters = new List<DbParameter>();
-                        for (int i = 0; i < num; i++)
-                        {
-                            var pair = list[i];
-
-                            var row = pair.MList.InnerList[pair.Index];
-
-                            parameters.AddRange(UpdateParameters(pair.Entity, row.RowId.Value, row.Element, pair.Index, pair.Forbidden, i.ToString()));
-                        }
-                        new SqlPreCommandSimple(sql, parameters).ExecuteNonQuery();
-                    };
-                });
-            }
-
-            public struct MListUpdate
-            {
-                public readonly Entity Entity;
-                public readonly Forbidden Forbidden;
-                public readonly IMListPrivate<T> MList;
-                public readonly int Index;
-
-                public MListUpdate(EntityForbidden ef, MList<T> mlist, int index)
-                {
-                    this.Entity = ef.Entity;
-                    this.Forbidden = ef.Forbidden;
-                    this.MList = mlist;
-                    this.Index = index;
-                }
-            }
-
-            internal Func<string, bool, string> sqlInsert;
-            public Func<Entity, T, int, Forbidden, string, List<DbParameter>> InsertParameters;
-            public ConcurrentDictionary<int, Action<List<MListInsert>>> insertCache =
-                new ConcurrentDictionary<int, Action<List<MListInsert>>>();
-
-            Action<List<MListInsert>> GetInsert(int numElements)
-            {
-                return insertCache.GetOrAdd(numElements, num =>
-                {
-                    string sqlMulti = new StringBuilder()
-                          .AppendLine("DECLARE @MyTable TABLE (Id " + this.table.PrimaryKey.SqlDbType.ToString().ToUpperInvariant() + ");")
-                          .AppendLines(Enumerable.Range(0, num).Select(i => sqlInsert(i.ToString(), true)))
-                          .AppendLine("SELECT Id from @MyTable").ToString();
-
-                    return (List<MListInsert> list) =>
-                    {
-                        List<DbParameter> result = new List<DbParameter>();
-                        for (int i = 0; i < num; i++)
-                        {
-                            var pair = list[i];
-                            result.AddRange(InsertParameters(pair.Entity, pair.MList.InnerList[pair.Index].Element, pair.Index, pair.Forbidden, i.ToString()));
-                        }
-
-                        DataTable dt = new SqlPreCommandSimple(sqlMulti, result).ExecuteDataTable();
-
-                        for (int i = 0; i < num; i++)
-                        {
-                            var pair = list[i];
-
-                            pair.MList.SetRowId(pair.Index, new PrimaryKey((IComparable)dt.Rows[i][0]));
-
-                            if (this.hasOrder)
-                                pair.MList.SetOldIndex(pair.Index);
-                        }
-                    };
-                });
-            }
-
-            public struct MListInsert
-            {
-                public readonly Entity Entity;
-                public readonly Forbidden Forbidden;
-                public readonly IMListPrivate<T> MList;
-                public readonly int Index;
-
-                public MListInsert(EntityForbidden ef, MList<T> mlist, int index)
-                {
-                    this.Entity = ef.Entity;
-                    this.Forbidden = ef.Forbidden;
-                    this.MList = mlist;
-                    this.Index = index;
-                }
-            }
-
-            public object[] BulkInsertDataRow(Entity entity, object value, int order)
-            {
-                return InsertParameters(entity, (T)value, order, new Forbidden(null), "").Select(a => a.Value).ToArray();
-            }
-
-            public Func<Entity, MList<T>> Getter;
-
-            public void RelationalInserts(List<EntityForbidden> entities)
-            {
-                List<MListInsert> toInsert = new List<MListInsert>();
-
-                foreach (var ef in entities)
-                {
-                    if (!ef.Forbidden.IsEmpty)
-                        continue; //Will be called again
-
-                    MList<T> collection = Getter(ef.Entity);
-
-                    if (collection == null)
-                        continue;
-
-                    if (collection.Modified == ModifiedState.Clean)
-                        continue;
-
-                    for (int i = 0; i < collection.Count; i++)
-                    {
-                        toInsert.Add(new MListInsert(ef, collection, i));
-                    }
-                }
-
-                toInsert.SplitStatements(this.table.Columns.Count, list => GetInsert(list.Count)(list));
-            }
-
-            public void RelationalUpdates(List<EntityForbidden> idents)
-            {
-                List<Entity> toDelete = new List<Entity>();
-                List<MListDelete> toDeleteExcept = new List<MListDelete>();
-                List<MListInsert> toInsert = new List<MListInsert>();
-                List<MListUpdate> toUpdate = new List<MListUpdate>();
-
-                foreach (var ef in idents)
-                {
-                    if (!ef.Forbidden.IsEmpty)
-                        continue; //Will be called again
-
-                    MList<T> collection = Getter(ef.Entity);
-
-                    if (collection == null)
-                        toDelete.Add(ef.Entity);
-                    else
-                    {
-                        if (collection.Modified == ModifiedState.Clean)
-                            continue;
-
-                        var innerList = ((IMListPrivate<T>)collection).InnerList;
-
-                        var exceptions = innerList.Select(a => a.RowId).NotNull().ToArray();
-
-                        if (exceptions.IsEmpty())
-                            toDelete.Add(ef.Entity);
-                        else
-                            toDeleteExcept.Add(new MListDelete(ef.Entity, exceptions));
-
-                        if (isEmbeddedEntity || hasOrder)
-                        {
-                            for (int i = 0; i < innerList.Count; i++)
-                            {
-                                var row = innerList[i];
-
-                                if (row.RowId.HasValue)
-                                {
-                                    if (hasOrder && row.OldIndex != i ||
-                                       isEmbeddedEntity && ((ModifiableEntity)(object)row.Element!).IsGraphModified)
-                                    {
-                                        toUpdate.Add(new MListUpdate(ef, collection, i));
-                                    }
-                                }
-                            }
-                        }
-
-                        for (int i = 0; i < innerList.Count; i++)
-                        {
-                            if (innerList[i].RowId == null)
-                                toInsert.Add(new MListInsert(ef, collection, i));
-                        }
-                    }
-                }
-
-                toDelete.SplitStatements(2, list => GetDelete(list.Count)(list));
-
-                toDeleteExcept.ForEach(e => GetDeleteExcept(e.ExceptRowIds.Length)(e));
-                toUpdate.SplitStatements(this.table.Columns.Count + 2, listPairs => GetUpdate(listPairs.Count)(listPairs));
-                toInsert.SplitStatements(this.table.Columns.Count, listPairs => GetInsert(listPairs.Count)(listPairs));
-            }
-
-            public SqlPreCommand? RelationalUpdateSync(Entity parent, string suffix, bool replaceParameter)
-            {
-                MList<T> collection = Getter(parent);
-
-                if (collection == null)
-                {
-                    if (parent.IsNew)
-                        return null;
-
-                    return new SqlPreCommandSimple(sqlDelete(suffix), new List<DbParameter> { DeleteParameter(parent, suffix) })
-                        .ReplaceFirstParameter(replaceParameter ? parent.Id.VariableName : null);
-                }
-
-                if (collection.Modified == ModifiedState.Clean)
-                    return null;
-
-                if (parent.IsNew)
-                {
-                    return collection.Select((e, i) =>
-                    {
-                        var parameters = InsertParameters(parent, e, i, new Forbidden(new HashSet<Entity> { parent }), suffix + "_" + i);
-                        var parentId = parameters.First(); // wont be replaced, generating @parentId
-                        parameters.RemoveAt(0);
-                        string script = sqlInsert(suffix + "_" + i, false);
-                        script = script.Replace(parentId.ParameterName, "@parentId");
-                        return new SqlPreCommandSimple(script, parameters).AddComment(e?.ToString());
-                    }).Combine(Spacing.Simple);
-                }
-                else
-                {
-                    return SqlPreCommand.Combine(Spacing.Simple,
-                        new SqlPreCommandSimple(sqlDelete(suffix), new List<DbParameter> { DeleteParameter(parent, suffix) }).ReplaceFirstParameter(replaceParameter ? parent.Id.VariableName : null),
-                        collection.Select((e, i) => new SqlPreCommandSimple(sqlInsert(suffix + "_" + i, false), InsertParameters(parent, e, i, new Forbidden(), suffix + "_" + i))
-                            .AddComment(e?.ToString())
-                            .ReplaceFirstParameter(replaceParameter ? parent.Id.VariableName : null)
-                        ).Combine(Spacing.Simple));
-                }
-            }
-        }
-
-        static GenericInvoker<Func<TableMList, IMListCache>> giCreateCache =
-            new GenericInvoker<Func<TableMList, IMListCache>>((TableMList rt) => rt.CreateCache<int>());
-
-        internal Lazy<IMListCache> cache;
-
-        TableMListCache<T> CreateCache<T>()
-        {
-            var pb = Connector.Current.ParameterBuilder;
-
-            TableMListCache<T> result = new TableMListCache<T>
-            {
-                table = this,
-                Getter = entity => (MList<T>)Getter(entity),
-
-                sqlDelete = suffix => "DELETE {0} WHERE {1} = {2}".FormatWith(Name, BackReference.Name.SqlEscape(), ParameterBuilder.GetParameterName(BackReference.Name + suffix)),
-                DeleteParameter = (ident, suffix) => pb.CreateReferenceParameter(ParameterBuilder.GetParameterName(BackReference.Name + suffix), ident.Id, this.BackReference.ReferenceTable.PrimaryKey),
-
-                sqlDeleteExcept = num =>
-                {
-                    var sql = "DELETE {0} WHERE {1} = {2}"
-                        .FormatWith(Name, BackReference.Name.SqlEscape(), ParameterBuilder.GetParameterName(BackReference.Name));
-
-                    sql += " AND {0} NOT IN ({1})"
-                        .FormatWith(PrimaryKey.Name.SqlEscape(), 0.To(num).Select(i => ParameterBuilder.GetParameterName("e" + i)).ToString(", "));
-
-                    return sql;
-                },
-
-                DeleteExceptParameter = delete =>
-                {
-                    var list = new List<DbParameter>
-                    {
-                    pb.CreateReferenceParameter(ParameterBuilder.GetParameterName(BackReference.Name), delete.Entity.Id, BackReference)
-                    };
-
-                    list.AddRange(delete.ExceptRowIds.Select((e, i) => pb.CreateReferenceParameter(ParameterBuilder.GetParameterName("e" + i), e, PrimaryKey)));
-
-                    return list;
-                }
-            };
-            var paramIdent = Expression.Parameter(typeof(Entity), "ident");
-            var paramItem = Expression.Parameter(typeof(T), "item");
-            var paramOrder = Expression.Parameter(typeof(int), "order");
-            var paramForbidden = Expression.Parameter(typeof(Forbidden), "forbidden");
-            var paramSuffix = Expression.Parameter(typeof(string), "suffix");
-
-
-            {
-                var trios = new List<Table.Trio>();
-                var assigments = new List<Expression>();
-
-                BackReference.CreateParameter(trios, assigments, paramIdent, paramForbidden, paramSuffix);
-                if (this.Order != null)
-                    Order.CreateParameter(trios, assigments, paramOrder, paramForbidden, paramSuffix);
-                Field.CreateParameter(trios, assigments, paramItem, paramForbidden, paramSuffix);
-
-                result.sqlInsert = (suffix, output) => "INSERT {0} ({1})\r\n{2} VALUES ({3})".FormatWith(Name,
-                    trios.ToString(p => p.SourceColumn.SqlEscape(), ", "),
-                    output ? "OUTPUT INSERTED.Id into @MyTable \r\n" : null,
-                    trios.ToString(p => p.ParameterName + suffix, ", "));
-
-                var expr = Expression.Lambda<Func<Entity, T, int, Forbidden, string, List<DbParameter>>>(
-                    Table.CreateBlock(trios.Select(a => a.ParameterBuilder), assigments), paramIdent, paramItem, paramOrder, paramForbidden, paramSuffix);
-
-                result.InsertParameters = expr.Compile();
-            }
-
-            result.hasOrder = this.Order != null;
-            result.isEmbeddedEntity = typeof(EmbeddedEntity).IsAssignableFrom(this.Field.FieldType);
-
-            if (result.isEmbeddedEntity || result.hasOrder)
-            {
-                var trios = new List<Table.Trio>();
-                var assigments = new List<Expression>();
-
-                var paramRowId = Expression.Parameter(typeof(PrimaryKey), "rowId");
-
-                string parentId = "parentId";
-                string rowId = "rowId";
-
-                //BackReference.CreateParameter(trios, assigments, paramIdent, paramForbidden, paramSuffix);
-                if (this.Order != null)
-                    Order.CreateParameter(trios, assigments, paramOrder, paramForbidden, paramSuffix);
-                Field.CreateParameter(trios, assigments, paramItem, paramForbidden, paramSuffix);
-
-                result.sqlUpdate = suffix => "UPDATE {0} SET \r\n{1}\r\n WHERE {2} = {3} AND {4} = {5}".FormatWith(Name,
-                    trios.ToString(p => "{0} = {1}".FormatWith(p.SourceColumn.SqlEscape(), p.ParameterName + suffix).Indent(2), ",\r\n"),
-                    this.BackReference.Name.SqlEscape(), ParameterBuilder.GetParameterName(parentId + suffix),
-                    this.PrimaryKey.Name.SqlEscape(), ParameterBuilder.GetParameterName(rowId + suffix));
-
-                var parameters = trios.Select(a => a.ParameterBuilder).ToList();
-
-                parameters.Add(pb.ParameterFactory(Table.Trio.Concat(parentId, paramSuffix), this.BackReference.SqlDbType, null, false,
-                    Expression.Field(Expression.Property(Expression.Field(paramIdent, Table.fiId), "Value"), "Object")));
-                parameters.Add(pb.ParameterFactory(Table.Trio.Concat(rowId, paramSuffix), this.PrimaryKey.SqlDbType, null, false,
-                    Expression.Field(paramRowId, "Object")));
-
-                var expr = Expression.Lambda<Func<Entity, PrimaryKey, T, int, Forbidden, string, List<DbParameter>>>(
-                    Table.CreateBlock(parameters, assigments), paramIdent, paramRowId, paramItem, paramOrder, paramForbidden, paramSuffix);
-                result.UpdateParameters = expr.Compile();
-            }
-
-            return result;
-        }
-    }
-
-    internal static class SaveUtils
-    {
-        public static void SplitStatements<T>(this IList<T> original, int numParametersPerElement, Action<List<T>> action)
-        {
-            if (!Connector.Current.AllowsMultipleQueries)
-            {
-                List<T> part = new List<T>(1);
-                for (int i = 0; i < original.Count; i++)
-                {
-                    part[0] = original[i];
-                    action(part);
-                }
-            }
-            else
-            {
-                var s = Schema.Current.Settings;
-                int max = Math.Min(s.MaxNumberOfStatementsInSaveQueries, s.MaxNumberOfParameters / numParametersPerElement);
-
-                List<T> part = new List<T>(max);
-                int i = 0;
-                for (; i <= original.Count - max; i += max)
-                {
-                    Fill(part, original, i, max);
-                    action(part);
-                }
-
-                int remaining = original.Count - i;
-                if (remaining > 0)
-                {
-                    Fill(part, original, i, remaining);
-                    action(part);
-                }
-            }
-        }
-
-        static List<T> Fill<T>(List<T> part, IList<T> original, int pos, int count)
-        {
-            part.Clear();
-            int max = pos + count;
-            for (int i = pos; i < max; i++)
-                part.Add(original[i]);
-            return part;
-        }
-    }
-
-
-    public abstract partial class Field
-    {
-        protected internal virtual void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix) { }
-    }
-
-    public partial class FieldPrimaryKey
-    {
-        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
-        {
-            trios.Add(new Table.Trio(this, Expression.Field(Expression.Property(value, "Value"), "Object"), suffix));
-        }
-    }
-
-    public partial class FieldValue
-    {
-        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
-        {
-            trios.Add(new Table.Trio(this, value, suffix));
-        }
-    }
-
-    public partial class FieldTicks
-    {
-        public static readonly ConstructorInfo ciDateTimeTicks = ReflectionTools.GetConstuctorInfo(() => new DateTime(0L));
-
-        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
-        {
-            if (this.Type == this.FieldType)
-                trios.Add(new Table.Trio(this, value, suffix));
-            else if (this.Type == typeof(DateTime))
-                trios.Add(new Table.Trio(this, Expression.New(ciDateTimeTicks, value), suffix));
-            else
-                throw new NotImplementedException("FieldTicks of type {0} not supported".FormatWith(this.Type));
-        }
-
-        internal Expression ConvertTicks(ParameterExpression paramOldTicks)
-        {
-            if (this.Type == this.FieldType)
-                return paramOldTicks;
-
-            if (this.Type == typeof(DateTime))
-                return Expression.New(ciDateTimeTicks, paramOldTicks);
-
-            throw new NotImplementedException("FieldTicks of type {0} not supported".FormatWith(this.Type));
-        }
-    }
-
-    public static partial class FieldReferenceExtensions
-    {
-        static MethodInfo miGetIdForLite = ReflectionTools.GetMethodInfo(() => GetIdForLite(null, new Forbidden()));
-        static MethodInfo miGetIdForEntity = ReflectionTools.GetMethodInfo(() => GetIdForEntity(null, new Forbidden()));
-        static MethodInfo miGetIdForLiteCleanEntity = ReflectionTools.GetMethodInfo(() => GetIdForLiteCleanEntity(null, new Forbidden()));
-
-        public static void AssertIsLite(this IFieldReference fr)
-        {
-            if (!fr.IsLite)
-                throw new InvalidOperationException("The field is not a lite");
-        }
-
-        public static Expression GetIdFactory(this IFieldReference fr, Expression value, Expression forbidden)
-        {
-            var mi = !fr.IsLite ? miGetIdForEntity :
-                fr.ClearEntityOnSaving ? miGetIdForLiteCleanEntity :
-                miGetIdForLite;
-
-            return Expression.Call(mi, value, forbidden);
-        }
-
-        static PrimaryKey? GetIdForLite(Lite<IEntity> lite, Forbidden forbidden)
-        {
-            if (lite == null)
-                return null;
-
-            if (lite.EntityOrNull == null)
-                return lite.Id;
-
-            if (forbidden.Contains((Entity)lite.EntityOrNull))
-                return null;
-
-            lite.RefreshId();
-
-            return lite.Id;
-        }
-
-        static PrimaryKey? GetIdForLiteCleanEntity(Lite<IEntity> lite, Forbidden forbidden)
-        {
-            if (lite == null)
-                return null;
-
-            if (lite.EntityOrNull == null)
-                return lite.Id;
-
-            if (forbidden.Contains((Entity)lite.EntityOrNull))
-                return null;
-
-            lite.RefreshId();
-            lite.ClearEntity();
-
-            return lite.Id;
-        }
-
-        static PrimaryKey? GetIdForEntity(IEntity value, Forbidden forbidden)
-        {
-            if (value == null)
-                return null;
-
-            Entity ie = (Entity)value;
-            return forbidden.Contains(ie) ? (PrimaryKey?)null : ie.Id;
-        }
-
-        static MethodInfo miGetTypeForLite = ReflectionTools.GetMethodInfo(() => GetTypeForLite(null, new Forbidden()));
-        static MethodInfo miGetTypeForEntity = ReflectionTools.GetMethodInfo(() => GetTypeForEntity(null, new Forbidden()));
-
-        public static Expression GetTypeFactory(this IFieldReference fr, Expression value, Expression forbidden)
-        {
-            return Expression.Call(fr.IsLite ? miGetTypeForLite : miGetTypeForEntity, value, forbidden);
-        }
-
-        static Type? GetTypeForLite(Lite<IEntity> value, Forbidden forbidden)
-        {
-            if (value == null)
-                return null;
-
-            Lite<IEntity> l = (Lite<IEntity>)value;
-            return l.EntityOrNull == null ? l.EntityType :
-                 forbidden.Contains((Entity)l.EntityOrNull) ? null :
-                 l.EntityType;
-        }
-
-        static Type? GetTypeForEntity(IEntity value, Forbidden forbidden)
-        {
-            if (value == null)
-                return null;
-
-            Entity ie = (Entity)value;
-            return forbidden.Contains(ie) ? null : ie.GetType();
-        }
-    }
-
-    public partial class FieldReference
-    {
-        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
-        {
-            trios.Add(new Table.Trio(this, Expression.Call(miUnWrap, this.GetIdFactory(value, forbidden)), suffix));
-        }
-
-        static MethodInfo miUnWrap = ReflectionTools.GetMethodInfo(() => Signum.Entities.PrimaryKey.Unwrap(null));
-    }
-
-    public partial class FieldEnum
-    {
-        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
-        {
-            trios.Add(new Table.Trio(this, Expression.Convert(value, this.Type), suffix));
-        }
-    }
-
-
-
-    public partial class FieldImplementedBy
-    {
-        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
-        {
-            ParameterExpression ibType = Expression.Parameter(typeof(Type), "ibType");
-            ParameterExpression ibId = Expression.Parameter(typeof(PrimaryKey?), "ibId");
-
-            assigments.Add(Expression.Assign(ibType, Expression.Call(Expression.Constant(this), miCheckType, this.GetTypeFactory(value, forbidden))));
-            assigments.Add(Expression.Assign(ibId, this.GetIdFactory(value, forbidden)));
-
-            foreach (var imp in ImplementationColumns)
-            {
-                trios.Add(new Table.Trio(imp.Value,
-                    Expression.Condition(Expression.Equal(ibType, Expression.Constant(imp.Key)),
-                        Expression.Field(Expression.Property(ibId, "Value"), "Object"),
-                        Expression.Constant(null, typeof(IComparable))),
-                    suffix));
-            }
-        }
-
-        static MethodInfo miCheckType = ReflectionTools.GetMethodInfo((FieldImplementedBy fe) => fe.CheckType(null));
-
-        Type CheckType(Type type)
-        {
-            if (type != null && !ImplementationColumns.ContainsKey(type))
-                throw new InvalidOperationException("Type {0} is not in the list of ImplementedBy:\r\n{1}".FormatWith(type.Name, ImplementationColumns.ToString(kvp => "{0} -> {1}".FormatWith(kvp.Key.Name, kvp.Value.Name), "\r\n")));
-
-            return type;
-        }
-    }
-
-    public partial class ImplementationColumn
-    {
-
-    }
-
-    public partial class FieldImplementedByAll
-    {
-
-        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
-        {
-            trios.Add(new Table.Trio(Column, Expression.Call(miUnWrapToString, this.GetIdFactory(value, forbidden)), suffix));
-            trios.Add(new Table.Trio(ColumnType, Expression.Call(miConvertType, this.GetTypeFactory(value, forbidden)), suffix));
-        }
-
-        static MethodInfo miUnWrapToString = ReflectionTools.GetMethodInfo(() => PrimaryKey.UnwrapToString(null));
-        static MethodInfo miConvertType = ReflectionTools.GetMethodInfo(() => ConvertType(null));
-
-        static IComparable? ConvertType(Type type)
-        {
-            if (type == null)
-                return null;
-
-            return TypeLogic.TypeToId.GetOrThrow(type, "{0} not registered in the schema").Object;
-        }
-    }
-
-    public partial class FieldMList
-    {
-    }
-
-    public partial class FieldEmbedded
-    {
-        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
-        {
-            ParameterExpression embedded = Expression.Parameter(this.FieldType, "embedded");
-
-            if (HasValue != null)
-            {
-                trios.Add(new Table.Trio(HasValue, Expression.NotEqual(value, Expression.Constant(null, FieldType)), suffix));
-            }
-
-            assigments.Add(Expression.Assign(embedded, Expression.Convert(value, this.FieldType)));
-
-            foreach (var ef in EmbeddedFields.Values)
-            {
-                ef.Field.CreateParameter(trios, assigments,
-                    Expression.Condition(
-                        Expression.Equal(embedded, Expression.Constant(null, this.FieldType)),
-                        Expression.Constant(null, ef.FieldInfo.FieldType.Nullify()),
-                        Expression.Field(embedded, ef.FieldInfo).Nullify()), forbidden, suffix);
-            }
-        }
-
-        static MethodInfo miCheckNull = ReflectionTools.GetMethodInfo((FieldEmbedded fe) => fe.CheckNull(null));
-        object CheckNull(object obj)
-        {
-            if (obj == null)
-                throw new InvalidOperationException("Impossible to save 'null' on the not-nullable embedded field of type '{0}'".FormatWith(this.FieldType.Name));
-
-            return obj;
-        }
-    }
-
-    public partial class FieldMixin
-    {
-        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
-        {
-            ParameterExpression mixin = Expression.Parameter(this.FieldType, "mixin");
-
-            assigments.Add(Expression.Assign(mixin, Expression.Call(value, MixinDeclarations.miMixin.MakeGenericMethod(this.FieldType))));
-            foreach (var ef in Fields.Values)
-            {
-                ef.Field.CreateParameter(trios, assigments,
-                    Expression.Field(mixin, ef.FieldInfo), forbidden, suffix);
-            }
-        }
-    }
-
-}
+        {
+            internal TableMList table;
+
+            internal Func<string, string> sqlDelete;
+            public Func<Entity, string, DbParameter> DeleteParameter;
+            public ConcurrentDictionary<int, Action<List<Entity>>> deleteCache = new ConcurrentDictionary<int, Action<List<Entity>>>();
+
+            Action<List<Entity>> GetDelete(int numEntities)
+            {
+                return deleteCache.GetOrAdd(numEntities, num =>
+                {
+                    string sql = Enumerable.Range(0, num).ToString(i => sqlDelete(i.ToString()), ";\r\n");
+
+                    return list =>
+                    {
+                        List<DbParameter> parameters = new List<DbParameter>();
+                        for (int i = 0; i < num; i++)
+                        {
+                            parameters.Add(DeleteParameter(list[i], i.ToString()));
+                        }
+                        new SqlPreCommandSimple(sql, parameters).ExecuteNonQuery();
+                    };
+                });
+            }
+
+            internal Func<int, string> sqlDeleteExcept;
+            public Func<MListDelete, List<DbParameter>> DeleteExceptParameter;
+            public ConcurrentDictionary<int, Action<MListDelete>> deleteExceptCache = new ConcurrentDictionary<int, Action<MListDelete>>();
+
+            Action<MListDelete> GetDeleteExcept(int numExceptions)
+            {
+                return deleteExceptCache.GetOrAdd(numExceptions, num =>
+                {
+                    string sql = sqlDeleteExcept(numExceptions); Enumerable.Range(0, num).ToString(i => sqlDelete(i.ToString()), ";\r\n");
+
+                    return delete =>
+                    {
+                        new SqlPreCommandSimple(sql, DeleteExceptParameter(delete)).ExecuteNonQuery();
+                    };
+                });
+            }
+
+            public struct MListDelete
+            {
+                public readonly Entity Entity;
+                public readonly PrimaryKey[] ExceptRowIds;
+
+                public MListDelete(Entity ident, PrimaryKey[] exceptRowIds)
+                {
+                    this.Entity = ident;
+                    this.ExceptRowIds = exceptRowIds;
+                }
+            }
+
+            internal bool hasOrder = false;
+            internal bool isEmbeddedEntity = false;
+            internal Func<string, string> sqlUpdate;
+            public Func<Entity, PrimaryKey, T, int, Forbidden, string, List<DbParameter>> UpdateParameters;
+            public ConcurrentDictionary<int, Action<List<MListUpdate>>> updateCache =
+                new ConcurrentDictionary<int, Action<List<MListUpdate>>>();
+
+            Action<List<MListUpdate>> GetUpdate(int numElements)
+            {
+                return updateCache.GetOrAdd(numElements, num =>
+                {
+                    string sql = Enumerable.Range(0, num).ToString(i => sqlUpdate(i.ToString()), ";\r\n");
+
+                    return (List<MListUpdate> list) =>
+                    {
+                        List<DbParameter> parameters = new List<DbParameter>();
+                        for (int i = 0; i < num; i++)
+                        {
+                            var pair = list[i];
+
+                            var row = pair.MList.InnerList[pair.Index];
+
+                            parameters.AddRange(UpdateParameters(pair.Entity, row.RowId!.Value, row.Element, pair.Index, pair.Forbidden, i.ToString()));
+                        }
+                        new SqlPreCommandSimple(sql, parameters).ExecuteNonQuery();
+                    };
+                });
+            }
+
+            public struct MListUpdate
+            {
+                public readonly Entity Entity;
+                public readonly Forbidden Forbidden;
+                public readonly IMListPrivate<T> MList;
+                public readonly int Index;
+
+                public MListUpdate(EntityForbidden ef, MList<T> mlist, int index)
+                {
+                    this.Entity = ef.Entity;
+                    this.Forbidden = ef.Forbidden;
+                    this.MList = mlist;
+                    this.Index = index;
+                }
+            }
+
+            internal Func<string, bool, string> sqlInsert;
+            public Func<Entity, T, int, Forbidden, string, List<DbParameter>> InsertParameters;
+            public ConcurrentDictionary<int, Action<List<MListInsert>>> insertCache =
+                new ConcurrentDictionary<int, Action<List<MListInsert>>>();
+
+            Action<List<MListInsert>> GetInsert(int numElements)
+            {
+                return insertCache.GetOrAdd(numElements, num =>
+                {
+                    string sqlMulti = new StringBuilder()
+                          .AppendLine("DECLARE @MyTable TABLE (Id " + this.table.PrimaryKey.SqlDbType.ToString().ToUpperInvariant() + ");")
+                          .AppendLines(Enumerable.Range(0, num).Select(i => sqlInsert(i.ToString(), true)))
+                          .AppendLine("SELECT Id from @MyTable").ToString();
+
+                    return (List<MListInsert> list) =>
+                    {
+                        List<DbParameter> result = new List<DbParameter>();
+                        for (int i = 0; i < num; i++)
+                        {
+                            var pair = list[i];
+                            result.AddRange(InsertParameters(pair.Entity, pair.MList.InnerList[pair.Index].Element, pair.Index, pair.Forbidden, i.ToString()));
+                        }
+
+                        DataTable dt = new SqlPreCommandSimple(sqlMulti, result).ExecuteDataTable();
+
+                        for (int i = 0; i < num; i++)
+                        {
+                            var pair = list[i];
+
+                            pair.MList.SetRowId(pair.Index, new PrimaryKey((IComparable)dt.Rows[i][0]));
+
+                            if (this.hasOrder)
+                                pair.MList.SetOldIndex(pair.Index);
+                        }
+                    };
+                });
+            }
+
+            public struct MListInsert
+            {
+                public readonly Entity Entity;
+                public readonly Forbidden Forbidden;
+                public readonly IMListPrivate<T> MList;
+                public readonly int Index;
+
+                public MListInsert(EntityForbidden ef, MList<T> mlist, int index)
+                {
+                    this.Entity = ef.Entity;
+                    this.Forbidden = ef.Forbidden;
+                    this.MList = mlist;
+                    this.Index = index;
+                }
+            }
+
+            public object[] BulkInsertDataRow(Entity entity, object value, int order)
+            {
+                return InsertParameters(entity, (T)value, order, new Forbidden(null), "").Select(a => a.Value).ToArray();
+            }
+
+            public Func<Entity, MList<T>> Getter;
+
+            public void RelationalInserts(List<EntityForbidden> entities)
+            {
+                List<MListInsert> toInsert = new List<MListInsert>();
+
+                foreach (var ef in entities)
+                {
+                    if (!ef.Forbidden.IsEmpty)
+                        continue; //Will be called again
+
+                    MList<T> collection = Getter(ef.Entity);
+
+                    if (collection == null)
+                        continue;
+
+                    if (collection.Modified == ModifiedState.Clean)
+                        continue;
+
+                    for (int i = 0; i < collection.Count; i++)
+                    {
+                        toInsert.Add(new MListInsert(ef, collection, i));
+                    }
+                }
+
+                toInsert.SplitStatements(this.table.Columns.Count, list => GetInsert(list.Count)(list));
+            }
+
+            public void RelationalUpdates(List<EntityForbidden> idents)
+            {
+                List<Entity> toDelete = new List<Entity>();
+                List<MListDelete> toDeleteExcept = new List<MListDelete>();
+                List<MListInsert> toInsert = new List<MListInsert>();
+                List<MListUpdate> toUpdate = new List<MListUpdate>();
+
+                foreach (var ef in idents)
+                {
+                    if (!ef.Forbidden.IsEmpty)
+                        continue; //Will be called again
+
+                    MList<T> collection = Getter(ef.Entity);
+
+                    if (collection == null)
+                        toDelete.Add(ef.Entity);
+                    else
+                    {
+                        if (collection.Modified == ModifiedState.Clean)
+                            continue;
+
+                        var innerList = ((IMListPrivate<T>)collection).InnerList;
+
+                        var exceptions = innerList.Select(a => a.RowId).NotNull().ToArray();
+
+                        if (exceptions.IsEmpty())
+                            toDelete.Add(ef.Entity);
+                        else
+                            toDeleteExcept.Add(new MListDelete(ef.Entity, exceptions));
+
+                        if (isEmbeddedEntity || hasOrder)
+                        {
+                            for (int i = 0; i < innerList.Count; i++)
+                            {
+                                var row = innerList[i];
+
+                                if (row.RowId.HasValue)
+                                {
+                                    if (hasOrder && row.OldIndex != i ||
+                                       isEmbeddedEntity && ((ModifiableEntity)(object)row.Element!).IsGraphModified)
+                                    {
+                                        toUpdate.Add(new MListUpdate(ef, collection, i));
+                                    }
+                                }
+                            }
+                        }
+
+                        for (int i = 0; i < innerList.Count; i++)
+                        {
+                            if (innerList[i].RowId == null)
+                                toInsert.Add(new MListInsert(ef, collection, i));
+                        }
+                    }
+                }
+
+                toDelete.SplitStatements(2, list => GetDelete(list.Count)(list));
+
+                toDeleteExcept.ForEach(e => GetDeleteExcept(e.ExceptRowIds.Length)(e));
+                toUpdate.SplitStatements(this.table.Columns.Count + 2, listPairs => GetUpdate(listPairs.Count)(listPairs));
+                toInsert.SplitStatements(this.table.Columns.Count, listPairs => GetInsert(listPairs.Count)(listPairs));
+            }
+
+            public SqlPreCommand? RelationalUpdateSync(Entity parent, string suffix, bool replaceParameter)
+            {
+                MList<T> collection = Getter(parent);
+
+                if (collection == null)
+                {
+                    if (parent.IsNew)
+                        return null;
+
+                    return new SqlPreCommandSimple(sqlDelete(suffix), new List<DbParameter> { DeleteParameter(parent, suffix) })
+                        .ReplaceFirstParameter(replaceParameter ? parent.Id.VariableName : null);
+                }
+
+                if (collection.Modified == ModifiedState.Clean)
+                    return null;
+
+                if (parent.IsNew)
+                {
+                    return collection.Select((e, i) =>
+                    {
+                        var parameters = InsertParameters(parent, e, i, new Forbidden(new HashSet<Entity> { parent }), suffix + "_" + i);
+                        var parentId = parameters.First(); // wont be replaced, generating @parentId
+                        parameters.RemoveAt(0);
+                        string script = sqlInsert(suffix + "_" + i, false);
+                        script = script.Replace(parentId.ParameterName, "@parentId");
+                        return new SqlPreCommandSimple(script, parameters).AddComment(e?.ToString());
+                    }).Combine(Spacing.Simple);
+                }
+                else
+                {
+                    return SqlPreCommand.Combine(Spacing.Simple,
+                        new SqlPreCommandSimple(sqlDelete(suffix), new List<DbParameter> { DeleteParameter(parent, suffix) }).ReplaceFirstParameter(replaceParameter ? parent.Id.VariableName : null),
+                        collection.Select((e, i) => new SqlPreCommandSimple(sqlInsert(suffix + "_" + i, false), InsertParameters(parent, e, i, new Forbidden(), suffix + "_" + i))
+                            .AddComment(e?.ToString())
+                            .ReplaceFirstParameter(replaceParameter ? parent.Id.VariableName : null)
+                        ).Combine(Spacing.Simple));
+                }
+            }
+        }
+
+        static GenericInvoker<Func<TableMList, IMListCache>> giCreateCache =
+            new GenericInvoker<Func<TableMList, IMListCache>>((TableMList rt) => rt.CreateCache<int>());
+
+        internal Lazy<IMListCache> cache;
+
+        TableMListCache<T> CreateCache<T>()
+        {
+            var pb = Connector.Current.ParameterBuilder;
+
+            TableMListCache<T> result = new TableMListCache<T>
+            {
+                table = this,
+                Getter = entity => (MList<T>)Getter(entity),
+
+                sqlDelete = suffix => "DELETE {0} WHERE {1} = {2}".FormatWith(Name, BackReference.Name.SqlEscape(), ParameterBuilder.GetParameterName(BackReference.Name + suffix)),
+                DeleteParameter = (ident, suffix) => pb.CreateReferenceParameter(ParameterBuilder.GetParameterName(BackReference.Name + suffix), ident.Id, this.BackReference.ReferenceTable.PrimaryKey),
+
+                sqlDeleteExcept = num =>
+                {
+                    var sql = "DELETE {0} WHERE {1} = {2}"
+                        .FormatWith(Name, BackReference.Name.SqlEscape(), ParameterBuilder.GetParameterName(BackReference.Name));
+
+                    sql += " AND {0} NOT IN ({1})"
+                        .FormatWith(PrimaryKey.Name.SqlEscape(), 0.To(num).Select(i => ParameterBuilder.GetParameterName("e" + i)).ToString(", "));
+
+                    return sql;
+                },
+
+                DeleteExceptParameter = delete =>
+                {
+                    var list = new List<DbParameter>
+                    {
+                    pb.CreateReferenceParameter(ParameterBuilder.GetParameterName(BackReference.Name), delete.Entity.Id, BackReference)
+                    };
+
+                    list.AddRange(delete.ExceptRowIds.Select((e, i) => pb.CreateReferenceParameter(ParameterBuilder.GetParameterName("e" + i), e, PrimaryKey)));
+
+                    return list;
+                }
+            };
+            var paramIdent = Expression.Parameter(typeof(Entity), "ident");
+            var paramItem = Expression.Parameter(typeof(T), "item");
+            var paramOrder = Expression.Parameter(typeof(int), "order");
+            var paramForbidden = Expression.Parameter(typeof(Forbidden), "forbidden");
+            var paramSuffix = Expression.Parameter(typeof(string), "suffix");
+
+
+            {
+                var trios = new List<Table.Trio>();
+                var assigments = new List<Expression>();
+
+                BackReference.CreateParameter(trios, assigments, paramIdent, paramForbidden, paramSuffix);
+                if (this.Order != null)
+                    Order.CreateParameter(trios, assigments, paramOrder, paramForbidden, paramSuffix);
+                Field.CreateParameter(trios, assigments, paramItem, paramForbidden, paramSuffix);
+
+                result.sqlInsert = (suffix, output) => "INSERT {0} ({1})\r\n{2} VALUES ({3})".FormatWith(Name,
+                    trios.ToString(p => p.SourceColumn.SqlEscape(), ", "),
+                    output ? "OUTPUT INSERTED.Id into @MyTable \r\n" : null,
+                    trios.ToString(p => p.ParameterName + suffix, ", "));
+
+                var expr = Expression.Lambda<Func<Entity, T, int, Forbidden, string, List<DbParameter>>>(
+                    Table.CreateBlock(trios.Select(a => a.ParameterBuilder), assigments), paramIdent, paramItem, paramOrder, paramForbidden, paramSuffix);
+
+                result.InsertParameters = expr.Compile();
+            }
+
+            result.hasOrder = this.Order != null;
+            result.isEmbeddedEntity = typeof(EmbeddedEntity).IsAssignableFrom(this.Field.FieldType);
+
+            if (result.isEmbeddedEntity || result.hasOrder)
+            {
+                var trios = new List<Table.Trio>();
+                var assigments = new List<Expression>();
+
+                var paramRowId = Expression.Parameter(typeof(PrimaryKey), "rowId");
+
+                string parentId = "parentId";
+                string rowId = "rowId";
+
+                //BackReference.CreateParameter(trios, assigments, paramIdent, paramForbidden, paramSuffix);
+                if (this.Order != null)
+                    Order.CreateParameter(trios, assigments, paramOrder, paramForbidden, paramSuffix);
+                Field.CreateParameter(trios, assigments, paramItem, paramForbidden, paramSuffix);
+
+                result.sqlUpdate = suffix => "UPDATE {0} SET \r\n{1}\r\n WHERE {2} = {3} AND {4} = {5}".FormatWith(Name,
+                    trios.ToString(p => "{0} = {1}".FormatWith(p.SourceColumn.SqlEscape(), p.ParameterName + suffix).Indent(2), ",\r\n"),
+                    this.BackReference.Name.SqlEscape(), ParameterBuilder.GetParameterName(parentId + suffix),
+                    this.PrimaryKey.Name.SqlEscape(), ParameterBuilder.GetParameterName(rowId + suffix));
+
+                var parameters = trios.Select(a => a.ParameterBuilder).ToList();
+
+                parameters.Add(pb.ParameterFactory(Table.Trio.Concat(parentId, paramSuffix), this.BackReference.SqlDbType, null, false,
+                    Expression.Field(Expression.Property(Expression.Field(paramIdent, Table.fiId), "Value"), "Object")));
+                parameters.Add(pb.ParameterFactory(Table.Trio.Concat(rowId, paramSuffix), this.PrimaryKey.SqlDbType, null, false,
+                    Expression.Field(paramRowId, "Object")));
+
+                var expr = Expression.Lambda<Func<Entity, PrimaryKey, T, int, Forbidden, string, List<DbParameter>>>(
+                    Table.CreateBlock(parameters, assigments), paramIdent, paramRowId, paramItem, paramOrder, paramForbidden, paramSuffix);
+                result.UpdateParameters = expr.Compile();
+            }
+
+            return result;
+        }
+    }
+
+    internal static class SaveUtils
+    {
+        public static void SplitStatements<T>(this IList<T> original, int numParametersPerElement, Action<List<T>> action)
+        {
+            if (!Connector.Current.AllowsMultipleQueries)
+            {
+                List<T> part = new List<T>(1);
+                for (int i = 0; i < original.Count; i++)
+                {
+                    part[0] = original[i];
+                    action(part);
+                }
+            }
+            else
+            {
+                var s = Schema.Current.Settings;
+                int max = Math.Min(s.MaxNumberOfStatementsInSaveQueries, s.MaxNumberOfParameters / numParametersPerElement);
+
+                List<T> part = new List<T>(max);
+                int i = 0;
+                for (; i <= original.Count - max; i += max)
+                {
+                    Fill(part, original, i, max);
+                    action(part);
+                }
+
+                int remaining = original.Count - i;
+                if (remaining > 0)
+                {
+                    Fill(part, original, i, remaining);
+                    action(part);
+                }
+            }
+        }
+
+        static List<T> Fill<T>(List<T> part, IList<T> original, int pos, int count)
+        {
+            part.Clear();
+            int max = pos + count;
+            for (int i = pos; i < max; i++)
+                part.Add(original[i]);
+            return part;
+        }
+    }
+
+
+    public abstract partial class Field
+    {
+        protected internal virtual void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix) { }
+    }
+
+    public partial class FieldPrimaryKey
+    {
+        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
+        {
+            trios.Add(new Table.Trio(this, Expression.Field(Expression.Property(value, "Value"), "Object"), suffix));
+        }
+    }
+
+    public partial class FieldValue
+    {
+        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
+        {
+            trios.Add(new Table.Trio(this, value, suffix));
+        }
+    }
+
+    public partial class FieldTicks
+    {
+        public static readonly ConstructorInfo ciDateTimeTicks = ReflectionTools.GetConstuctorInfo(() => new DateTime(0L));
+
+        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
+        {
+            if (this.Type == this.FieldType)
+                trios.Add(new Table.Trio(this, value, suffix));
+            else if (this.Type == typeof(DateTime))
+                trios.Add(new Table.Trio(this, Expression.New(ciDateTimeTicks, value), suffix));
+            else
+                throw new NotImplementedException("FieldTicks of type {0} not supported".FormatWith(this.Type));
+        }
+
+        internal Expression ConvertTicks(ParameterExpression paramOldTicks)
+        {
+            if (this.Type == this.FieldType)
+                return paramOldTicks;
+
+            if (this.Type == typeof(DateTime))
+                return Expression.New(ciDateTimeTicks, paramOldTicks);
+
+            throw new NotImplementedException("FieldTicks of type {0} not supported".FormatWith(this.Type));
+        }
+    }
+
+    public static partial class FieldReferenceExtensions
+    {
+        static MethodInfo miGetIdForLite = ReflectionTools.GetMethodInfo(() => GetIdForLite(null, new Forbidden()));
+        static MethodInfo miGetIdForEntity = ReflectionTools.GetMethodInfo(() => GetIdForEntity(null, new Forbidden()));
+        static MethodInfo miGetIdForLiteCleanEntity = ReflectionTools.GetMethodInfo(() => GetIdForLiteCleanEntity(null, new Forbidden()));
+
+        public static void AssertIsLite(this IFieldReference fr)
+        {
+            if (!fr.IsLite)
+                throw new InvalidOperationException("The field is not a lite");
+        }
+
+        public static Expression GetIdFactory(this IFieldReference fr, Expression value, Expression forbidden)
+        {
+            var mi = !fr.IsLite ? miGetIdForEntity :
+                fr.ClearEntityOnSaving ? miGetIdForLiteCleanEntity :
+                miGetIdForLite;
+
+            return Expression.Call(mi, value, forbidden);
+        }
+
+        static PrimaryKey? GetIdForLite(Lite<IEntity> lite, Forbidden forbidden)
+        {
+            if (lite == null)
+                return null;
+
+            if (lite.EntityOrNull == null)
+                return lite.Id;
+
+            if (forbidden.Contains((Entity)lite.EntityOrNull))
+                return null;
+
+            lite.RefreshId();
+
+            return lite.Id;
+        }
+
+        static PrimaryKey? GetIdForLiteCleanEntity(Lite<IEntity> lite, Forbidden forbidden)
+        {
+            if (lite == null)
+                return null;
+
+            if (lite.EntityOrNull == null)
+                return lite.Id;
+
+            if (forbidden.Contains((Entity)lite.EntityOrNull))
+                return null;
+
+            lite.RefreshId();
+            lite.ClearEntity();
+
+            return lite.Id;
+        }
+
+        static PrimaryKey? GetIdForEntity(IEntity value, Forbidden forbidden)
+        {
+            if (value == null)
+                return null;
+
+            Entity ie = (Entity)value;
+            return forbidden.Contains(ie) ? (PrimaryKey?)null : ie.Id;
+        }
+
+        static MethodInfo miGetTypeForLite = ReflectionTools.GetMethodInfo(() => GetTypeForLite(null, new Forbidden()));
+        static MethodInfo miGetTypeForEntity = ReflectionTools.GetMethodInfo(() => GetTypeForEntity(null, new Forbidden()));
+
+        public static Expression GetTypeFactory(this IFieldReference fr, Expression value, Expression forbidden)
+        {
+            return Expression.Call(fr.IsLite ? miGetTypeForLite : miGetTypeForEntity, value, forbidden);
+        }
+
+        static Type? GetTypeForLite(Lite<IEntity> value, Forbidden forbidden)
+        {
+            if (value == null)
+                return null;
+
+            Lite<IEntity> l = (Lite<IEntity>)value;
+            return l.EntityOrNull == null ? l.EntityType :
+                 forbidden.Contains((Entity)l.EntityOrNull) ? null :
+                 l.EntityType;
+        }
+
+        static Type? GetTypeForEntity(IEntity value, Forbidden forbidden)
+        {
+            if (value == null)
+                return null;
+
+            Entity ie = (Entity)value;
+            return forbidden.Contains(ie) ? null : ie.GetType();
+        }
+    }
+
+    public partial class FieldReference
+    {
+        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
+        {
+            trios.Add(new Table.Trio(this, Expression.Call(miUnWrap, this.GetIdFactory(value, forbidden)), suffix));
+        }
+
+        static MethodInfo miUnWrap = ReflectionTools.GetMethodInfo(() => Signum.Entities.PrimaryKey.Unwrap(null));
+    }
+
+    public partial class FieldEnum
+    {
+        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
+        {
+            trios.Add(new Table.Trio(this, Expression.Convert(value, this.Type), suffix));
+        }
+    }
+
+
+
+    public partial class FieldImplementedBy
+    {
+        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
+        {
+            ParameterExpression ibType = Expression.Parameter(typeof(Type), "ibType");
+            ParameterExpression ibId = Expression.Parameter(typeof(PrimaryKey?), "ibId");
+
+            assigments.Add(Expression.Assign(ibType, Expression.Call(Expression.Constant(this), miCheckType, this.GetTypeFactory(value, forbidden))));
+            assigments.Add(Expression.Assign(ibId, this.GetIdFactory(value, forbidden)));
+
+            foreach (var imp in ImplementationColumns)
+            {
+                trios.Add(new Table.Trio(imp.Value,
+                    Expression.Condition(Expression.Equal(ibType, Expression.Constant(imp.Key)),
+                        Expression.Field(Expression.Property(ibId, "Value"), "Object"),
+                        Expression.Constant(null, typeof(IComparable))),
+                    suffix));
+            }
+        }
+
+        static MethodInfo miCheckType = ReflectionTools.GetMethodInfo((FieldImplementedBy fe) => fe.CheckType(null));
+
+        Type CheckType(Type type)
+        {
+            if (type != null && !ImplementationColumns.ContainsKey(type))
+                throw new InvalidOperationException("Type {0} is not in the list of ImplementedBy:\r\n{1}".FormatWith(type.Name, ImplementationColumns.ToString(kvp => "{0} -> {1}".FormatWith(kvp.Key.Name, kvp.Value.Name), "\r\n")));
+
+            return type;
+        }
+    }
+
+    public partial class ImplementationColumn
+    {
+
+    }
+
+    public partial class FieldImplementedByAll
+    {
+
+        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
+        {
+            trios.Add(new Table.Trio(Column, Expression.Call(miUnWrapToString, this.GetIdFactory(value, forbidden)), suffix));
+            trios.Add(new Table.Trio(ColumnType, Expression.Call(miConvertType, this.GetTypeFactory(value, forbidden)), suffix));
+        }
+
+        static MethodInfo miUnWrapToString = ReflectionTools.GetMethodInfo(() => PrimaryKey.UnwrapToString(null));
+        static MethodInfo miConvertType = ReflectionTools.GetMethodInfo(() => ConvertType(null));
+
+        static IComparable? ConvertType(Type type)
+        {
+            if (type == null)
+                return null;
+
+            return TypeLogic.TypeToId.GetOrThrow(type, "{0} not registered in the schema").Object;
+        }
+    }
+
+    public partial class FieldMList
+    {
+    }
+
+    public partial class FieldEmbedded
+    {
+        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
+        {
+            ParameterExpression embedded = Expression.Parameter(this.FieldType, "embedded");
+
+            if (HasValue != null)
+            {
+                trios.Add(new Table.Trio(HasValue, Expression.NotEqual(value, Expression.Constant(null, FieldType)), suffix));
+            }
+
+            assigments.Add(Expression.Assign(embedded, Expression.Convert(value, this.FieldType)));
+
+            foreach (var ef in EmbeddedFields.Values)
+            {
+                ef.Field.CreateParameter(trios, assigments,
+                    Expression.Condition(
+                        Expression.Equal(embedded, Expression.Constant(null, this.FieldType)),
+                        Expression.Constant(null, ef.FieldInfo.FieldType.Nullify()),
+                        Expression.Field(embedded, ef.FieldInfo).Nullify()), forbidden, suffix);
+            }
+        }
+
+        static MethodInfo miCheckNull = ReflectionTools.GetMethodInfo((FieldEmbedded fe) => fe.CheckNull(null));
+        object CheckNull(object obj)
+        {
+            if (obj == null)
+                throw new InvalidOperationException("Impossible to save 'null' on the not-nullable embedded field of type '{0}'".FormatWith(this.FieldType.Name));
+
+            return obj;
+        }
+    }
+
+    public partial class FieldMixin
+    {
+        protected internal override void CreateParameter(List<Table.Trio> trios, List<Expression> assigments, Expression value, Expression forbidden, Expression suffix)
+        {
+            ParameterExpression mixin = Expression.Parameter(this.FieldType, "mixin");
+
+            assigments.Add(Expression.Assign(mixin, Expression.Call(value, MixinDeclarations.miMixin.MakeGenericMethod(this.FieldType))));
+            foreach (var ef in Fields.Values)
+            {
+                ef.Field.CreateParameter(trios, assigments,
+                    Expression.Field(mixin, ef.FieldInfo), forbidden, suffix);
+            }
+        }
+    }
+
+}
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
index 8444a348d4..51d3a95482 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
@@ -787,7 +787,7 @@ protected static Type CleanType(Type type)
             return type;
         }
 
-        public virtual ObjectName GenerateTableName(Type type, TableNameAttribute tn)
+        public virtual ObjectName GenerateTableName(Type type, TableNameAttribute? tn)
         {
             SchemaName sn = tn != null ? GetSchemaName(tn) : SchemaName.Default;
 
@@ -987,7 +987,7 @@ public Table NewView(Type type)
         }
 
 
-        public override ObjectName GenerateTableName(Type type, TableNameAttribute tn)
+        public override ObjectName GenerateTableName(Type type, TableNameAttribute? tn)
         {
             if (tn != null)
             {
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
index 20b0de01be..af84ea7072 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilderSettings.cs
@@ -12,6 +12,7 @@
 using System.Collections.ObjectModel;
 using System.Collections.Concurrent;
 using Signum.Utilities.ExpressionTrees;
+using System.Runtime.CompilerServices;
 
 namespace Signum.Engine.Maps
 {
@@ -220,18 +221,14 @@ private IsNullable GetIsNullablePrivate(PropertyRoute propertyRoute)
             if (propertyRoute.PropertyRouteType == PropertyRouteType.MListItems)
                 return IsNullable.No;
 
-            if (ValidatorAttribute<NotNullValidatorAttribute>(propertyRoute) != null)
-                return IsNullable.No;
-
-            //if (propertyRoute.Type == typeof(string))
-            //{
-            //    var slv = ValidatorAttribute<StringLengthValidatorAttribute>(propertyRoute);
+            if (propertyRoute.Type.IsValueType)
+                return propertyRoute.Type.IsNullable() ? IsNullable.Yes : IsNullable.No;
 
-            //    if (slv != null)
-            //        return slv.AllowNulls ? IsNullable.Yes : IsNullable.No;
-            //}
+            var nullable = FieldAttribute<NullableAttribute>(propertyRoute);
+            if (nullable != null && nullable.IsNullableMain == true)
+                return IsNullable.Yes;
 
-            return !propertyRoute.Type.IsValueType || propertyRoute.Type.IsNullable() ? IsNullable.Yes : IsNullable.No;
+            return IsNullable.No;
         }
 
         public bool ImplementedBy<T>(Expression<Func<T, object?>> propertyRoute, Type typeToImplement) where T : Entity
diff --git a/Signum.Engine/Signum.Engine.csproj b/Signum.Engine/Signum.Engine.csproj
index 961a8f4250..90113cff7a 100644
--- a/Signum.Engine/Signum.Engine.csproj
+++ b/Signum.Engine/Signum.Engine.csproj
@@ -9,10 +9,6 @@
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
-  
-  <PropertyGroup>
-    <NoWarn>1701;1702;8629</NoWarn>
-  </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Signum.Analyzer" Version="1.0.1" />
     <PackageReference Include="Signum.MSBuildTask" Version="1.0.3" />
diff --git a/Signum.Entities/Basics/Exception.cs b/Signum.Entities/Basics/Exception.cs
index 282a85c521..04b0f1c538 100644
--- a/Signum.Entities/Basics/Exception.cs
+++ b/Signum.Entities/Basics/Exception.cs
@@ -128,7 +128,7 @@ public static string Dump(NameValueCollection nameValueCollection)
     public class DeleteLogParametersEmbedded : EmbeddedEntity
     {
         [PreserveOrder]
-        [NotNullValidator, NoRepeatValidator]
+        [NoRepeatValidator]
         public MList<DeleteLogsTypeOverridesEmbedded> DeleteLogs { get; set; } = new MList<DeleteLogsTypeOverridesEmbedded>();
 
         public DateTime? GetDateLimitDelete(TypeEntity type)
@@ -163,7 +163,6 @@ public class DeleteLogParametersEmbedded : EmbeddedEntity
     [Serializable]
     public class DeleteLogsTypeOverridesEmbedded : EmbeddedEntity
     {
-        [NotNullValidator]
         public Lite<TypeEntity> Type { get; set; }
 
         [Unit("Days"), NumberIsValidator(ComparisonType.GreaterThanOrEqualTo, 0)]
diff --git a/Signum.Entities/Basics/OperationLog.cs b/Signum.Entities/Basics/OperationLog.cs
index 3596cea406..c16352d81b 100644
--- a/Signum.Entities/Basics/OperationLog.cs
+++ b/Signum.Entities/Basics/OperationLog.cs
@@ -32,7 +32,7 @@ public double? Duration
             get { return End == null ? null : DurationExpression.Evaluate(this); }
         }
 
-        public Lite<ExceptionEntity> Exception { get; set; }
+        public Lite<ExceptionEntity>? Exception { get; set; }
 
         public override string ToString()
         {
diff --git a/Signum.Entities/Basics/PropertyRouteEntity.cs b/Signum.Entities/Basics/PropertyRouteEntity.cs
index 88aedb04ab..c4234f041e 100644
--- a/Signum.Entities/Basics/PropertyRouteEntity.cs
+++ b/Signum.Entities/Basics/PropertyRouteEntity.cs
@@ -20,7 +20,6 @@ public PropertyRoute Route
         [StringLengthValidator(Min = 1, Max = 100)]
         public string Path { get; set; }
 
-        [NotNullValidator]
         public TypeEntity RootType { get; set; }
 
         public static Func<PropertyRouteEntity, PropertyRoute> ToPropertyRouteFunc;
diff --git a/Signum.Entities/DynamicQuery/ResultTable.cs b/Signum.Entities/DynamicQuery/ResultTable.cs
index 97278e028a..4918c4274c 100644
--- a/Signum.Entities/DynamicQuery/ResultTable.cs
+++ b/Signum.Entities/DynamicQuery/ResultTable.cs
@@ -316,7 +316,7 @@ public DataTable ToDataTablePivot(int rowColumnIndex, int columnColumnIndex, int
 
         public int? TotalPages
         {
-            get { return Pagination is Pagination.Paginate ? ((Pagination.Paginate)Pagination).TotalPages(TotalElements.Value) : (int?)null; }
+            get { return Pagination is Pagination.Paginate ? ((Pagination.Paginate)Pagination).TotalPages(TotalElements!.Value) : (int?)null; }
         }
 
         public int? StartElementIndex
diff --git a/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs b/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
index c478173303..948776cbf1 100644
--- a/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/QueryToken.cs
@@ -170,7 +170,7 @@ protected List<QueryToken> SubTokensBase(Type type, SubTokensOptions options, Im
             Type cleanType = type.CleanType();
             if (cleanType.IsIEntity())
             {
-                if (implementations.Value.IsByAll)
+                if (implementations!.Value.IsByAll)
                     return ImplementedByAllSubTokens(this, type, options); // new[] { EntityPropertyToken.IdProperty(this) };
 
                 var onlyType = implementations.Value.Types.Only();
@@ -397,7 +397,7 @@ static string GetNiceTypeName(Type type, Implementations? implementations)
                 case FilterType.Lite:
                     {
                         var cleanType = type.CleanType();
-                        var imp = implementations.Value;
+                        var imp = implementations!.Value;
 
                         if (imp.IsByAll)
                             return QueryTokenMessage.AnyEntity.NiceToString();
diff --git a/Signum.Entities/FieldAttributes.cs b/Signum.Entities/FieldAttributes.cs
index b3ee96e33a..ca44378356 100644
--- a/Signum.Entities/FieldAttributes.cs
+++ b/Signum.Entities/FieldAttributes.cs
@@ -250,7 +250,7 @@ public class SqlDbTypeAttribute : Attribute
 
         public SqlDbType SqlDbType
         {
-            get { return sqlDbType.Value; }
+            get { return sqlDbType!.Value; }
             set { sqlDbType = value; }
         }
 
@@ -261,7 +261,7 @@ public bool HasSqlDbType
 
         public int Size
         {
-            get { return size.Value; }
+            get { return size!.Value; }
             set { size = value; }
         }
 
@@ -272,7 +272,7 @@ public bool HasSize
 
         public int Scale
         {
-            get { return scale.Value; }
+            get { return scale!.Value; }
             set { scale = value; }
         }
 
diff --git a/Signum.Entities/MList.cs b/Signum.Entities/MList.cs
index 73edeae855..1475f4d921 100644
--- a/Signum.Entities/MList.cs
+++ b/Signum.Entities/MList.cs
@@ -682,7 +682,7 @@ void IMListPrivate.SetOldIndex(int index)
         {
             var prev = this.innerList[index];
 
-            this.innerList[index] = new RowIdElement(prev.Element, prev.RowId.Value, index);
+            this.innerList[index] = new RowIdElement(prev.Element, prev.RowId!.Value, index);
         }
 
         void IMListPrivate.ExecutePostRetrieving()
@@ -695,11 +695,11 @@ protected internal override void PostRetrieving()
             if (this.innerList.Any(a => a.RowId == null))
                 return; //The MList was changed in the entity PostRetriever, like UserChart Columns
 
-            if (this.innerList.Select(a => a.RowId.Value).Duplicates().Any())
+            if (this.innerList.Select(a => a.RowId!.Value).Duplicates().Any())
                 throw new InvalidOperationException("Duplicated RowId found, possible problem in LINQ provider");
 
             if (this.innerList.Any(a => a.OldIndex.HasValue))
-                this.innerList.Sort(a => a.OldIndex.Value);
+                this.innerList.Sort(a => a.OldIndex!.Value);
         }
 
         public bool AssignMList(MList<T> list)
@@ -758,7 +758,7 @@ bool IMListPrivate<T>.IsEqualTo(List<MList<T>.RowIdElement> newList, bool orderM
             }
             else
             {
-                var current = innerList.ToDictionary(a => a.RowId.Value, a => a.Element);
+                var current = innerList.ToDictionary(a => a.RowId!.Value, a => a.Element);
 
                 foreach (var item in newList)
                 {
diff --git a/Signum.Entities/Signum.Entities.csproj b/Signum.Entities/Signum.Entities.csproj
index 8d977101ff..073a35f08c 100644
--- a/Signum.Entities/Signum.Entities.csproj
+++ b/Signum.Entities/Signum.Entities.csproj
@@ -9,10 +9,6 @@
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
-  <PropertyGroup>
-    <NoWarn>1701;1702;8629</NoWarn>
-  </PropertyGroup>
-
   <ItemGroup>
     <PackageReference Include="Signum.Analyzer" Version="1.0.1" />
     <PackageReference Include="Signum.MSBuildTask" Version="1.0.3" />
diff --git a/Signum.Entities/ValidationAttributes.cs b/Signum.Entities/ValidationAttributes.cs
index f887a6f714..b4fb6f875e 100644
--- a/Signum.Entities/ValidationAttributes.cs
+++ b/Signum.Entities/ValidationAttributes.cs
@@ -66,9 +66,14 @@ public string? UnlocalizableErrorMessage
 
     public class NotNullValidatorAttribute : ValidatorAttribute
     {
+        public bool Disabled { get; set; }
+
         protected override string? OverrideError(object? obj)
         {
-            if (obj == null)
+            if (Disabled)
+                return null;
+
+            if (obj == null || obj is string s && s == "")
                 return ValidationMessage._0IsNotSet.NiceToString();
 
             return null;
diff --git a/Signum.Entities/Validator.cs b/Signum.Entities/Validator.cs
index 559bc02249..73aeee33cb 100644
--- a/Signum.Entities/Validator.cs
+++ b/Signum.Entities/Validator.cs
@@ -6,6 +6,7 @@
 using System.Reflection;
 using System.Linq.Expressions;
 using Signum.Utilities.ExpressionTrees;
+using System.Runtime.CompilerServices;
 
 namespace Signum.Entities
 {
@@ -52,8 +53,6 @@ static void GenerateType<T>() where T : ModifiableEntity
             validators.SetDefinition(typeof(T), dic);
         }
 
-  
-
         public static PropertyValidator<T> OverridePropertyValidator<T>(Expression<Func<T, object?>> property) where T : ModifiableEntity
         {
             GenerateType<T>();
@@ -164,6 +163,10 @@ internal PropertyValidator(PropertyInfo pi)
             this.PropertyInfo = pi;
 
             this.Validators = pi.GetCustomAttributes(typeof(ValidatorAttribute), false).OfType<ValidatorAttribute>().OrderBy(va => va.Order).ThenBy(va => va.GetType().Name).ToList();
+            
+            var nullable = pi.GetCustomAttribute<NullableAttribute>();
+            if (nullable != null && nullable.IsNullableMain == false && this.Validators.Any(v => v is ValidatorAttribute))
+                this.Validators.Add(new NotNullValidatorAttribute());
 
             this.GetValue = ReflectionTools.CreateGetter<T>(pi)!;
             this.SetValue = ReflectionTools.CreateSetter<T>(pi)!;
diff --git a/Signum.React/ApiControllers/QueryController.cs b/Signum.React/ApiControllers/QueryController.cs
index 53bced9496..4ea361fc88 100644
--- a/Signum.React/ApiControllers/QueryController.cs
+++ b/Signum.React/ApiControllers/QueryController.cs
@@ -51,7 +51,7 @@ public async Task<ResultTable> FindRowsLike([Required, FromBody]AutocompleteQuer
             };
 
             var dqueryable = QueryLogic.Queries.GetDQueryable(dqRequest);
-            var entityType = qd.Columns.Single(a => a.IsEntity).Implementations.Value.Types.SingleEx();
+            var entityType = qd.Columns.Single(a => a.IsEntity).Implementations!.Value.Types.SingleEx();
 
             var result = await dqueryable.Query.AutocompleteUntypedAsync(dqueryable.Context.GetEntitySelector(), request.subString, request.count, entityType, token);
 
@@ -365,8 +365,8 @@ public Pagination ToPagination()
             switch (mode)
             {
                 case PaginationMode.All: return new Pagination.All();
-                case PaginationMode.Firsts: return new Pagination.Firsts(this.elementsPerPage.Value);
-                case PaginationMode.Paginate: return new Pagination.Paginate(this.elementsPerPage.Value, this.currentPage.Value);
+                case PaginationMode.Firsts: return new Pagination.Firsts(this.elementsPerPage!.Value);
+                case PaginationMode.Paginate: return new Pagination.Paginate(this.elementsPerPage!.Value, this.currentPage!.Value);
                 default:throw new InvalidOperationException($"Unexpected {mode}");
             }
         }
@@ -423,9 +423,9 @@ public SystemTime ToSystemTime()
             switch (mode)
             {
                 case SystemTimeMode.All: return new SystemTime.All();
-                case SystemTimeMode.AsOf: return new SystemTime.AsOf(startDate.Value);
-                case SystemTimeMode.Between: return new SystemTime.Between(startDate.Value, endDate.Value);
-                case SystemTimeMode.ContainedIn: return new SystemTime.ContainedIn(startDate.Value, endDate.Value);
+                case SystemTimeMode.AsOf: return new SystemTime.AsOf(startDate!.Value);
+                case SystemTimeMode.Between: return new SystemTime.Between(startDate!.Value, endDate!.Value);
+                case SystemTimeMode.ContainedIn: return new SystemTime.ContainedIn(startDate!.Value, endDate!.Value);
                 default: throw new InvalidOperationException($"Unexpected {mode}");
             }
         }
diff --git a/Signum.React/Facades/ReflectionServer.cs b/Signum.React/Facades/ReflectionServer.cs
index 85316d5a3d..49c1a2cf22 100644
--- a/Signum.React/Facades/ReflectionServer.cs
+++ b/Signum.React/Facades/ReflectionServer.cs
@@ -283,7 +283,7 @@ select KVP.Create(GetTypeName(type), OnAddTypeExtension(new TypeInfoTS
                                   .ToDictionary(s => s.FieldInfo.Name, s => OnAddFieldInfoExtension(new MemberInfoTS
                                   {
                                       NiceName = s.FieldInfo.NiceName(),
-                                      Id = s.IdOrNull.Value.Object
+                                      Id = s.IdOrNull!.Value.Object
                                   }, s.FieldInfo))
                           }, type)))
                           .Where(a => a.Value.Members.Any())
diff --git a/Signum.React/Filters/SignumFilters.cs b/Signum.React/Filters/SignumFilters.cs
index 5225dfd50d..ad6aef32d9 100644
--- a/Signum.React/Filters/SignumFilters.cs
+++ b/Signum.React/Filters/SignumFilters.cs
@@ -43,7 +43,7 @@ public class SignumAuthenticationFilter : SignumDisposableResourceFilter
     {
         public SignumAuthenticationFilter() : base("Signum_User"){ }
 
-        public static readonly IList<Func<FilterContext, SignumAuthenticationResult>> Authenticators = new List<Func<FilterContext, SignumAuthenticationResult>>();
+        public static readonly IList<Func<FilterContext, SignumAuthenticationResult?>> Authenticators = new List<Func<FilterContext, SignumAuthenticationResult>>();
 
         private static SignumAuthenticationResult? Authenticate(ResourceExecutingContext actionContext)
         {
diff --git a/Signum.React/JsonConverters/LiteJsonConverter.cs b/Signum.React/JsonConverters/LiteJsonConverter.cs
index 8db15e2258..e585d1ef39 100644
--- a/Signum.React/JsonConverters/LiteJsonConverter.cs
+++ b/Signum.React/JsonConverters/LiteJsonConverter.cs
@@ -73,7 +73,7 @@ public override void WriteJson(JsonWriter writer, object value, JsonSerializer s
             PrimaryKey? idOrNull = idObj == null ? (PrimaryKey?)null : PrimaryKey.Parse(idObj, type);
 
             if (entity == null)
-                return Lite.Create(type, idOrNull.Value, toString!);
+                return Lite.Create(type, idOrNull!.Value, toString!);
 
             var result = entity.ToLiteFat(toString);
 
diff --git a/Signum.React/JsonConverters/MListJsonConverter.cs b/Signum.React/JsonConverters/MListJsonConverter.cs
index f8077db8d0..dd2042f9ce 100644
--- a/Signum.React/JsonConverters/MListJsonConverter.cs
+++ b/Signum.React/JsonConverters/MListJsonConverter.cs
@@ -64,7 +64,7 @@ public override object ReadJson(JsonReader reader, Type objectType, object exist
         static MList<T> ReadJsonInternal<T>(JsonReader reader, IMListPrivate<T> existingValue, JsonSerializer serializer)
         {
             var dic = existingValue == null ? new Dictionary<PrimaryKey, MList<T>.RowIdElement>() :
-                 existingValue.InnerList.Where(a => a.RowId.HasValue).ToDictionary(a => a.RowId.Value, a => a);
+                 existingValue.InnerList.Where(a => a.RowId.HasValue).ToDictionary(a => a.RowId!.Value, a => a);
 
             var newList = new List<MList<T>.RowIdElement>();
 
diff --git a/Signum.React/Scripts/Signum.Entities.Basics.ts b/Signum.React/Scripts/Signum.Entities.Basics.ts
index 5c01566fb3..c802c1816e 100644
--- a/Signum.React/Scripts/Signum.Entities.Basics.ts
+++ b/Signum.React/Scripts/Signum.Entities.Basics.ts
@@ -9,54 +9,54 @@ import * as Entities from './Signum.Entities'
 export const ColorEmbedded = new Type<ColorEmbedded>("ColorEmbedded");
 export interface ColorEmbedded extends Entities.EmbeddedEntity {
   Type: "ColorEmbedded";
-  argb?: number;
+  argb: number;
 }
 
 export const DeleteLogParametersEmbedded = new Type<DeleteLogParametersEmbedded>("DeleteLogParametersEmbedded");
 export interface DeleteLogParametersEmbedded extends Entities.EmbeddedEntity {
   Type: "DeleteLogParametersEmbedded";
   deleteLogs: Entities.MList<DeleteLogsTypeOverridesEmbedded>;
-  chunkSize?: number;
-  maxChunks?: number;
-  pauseTime?: number | null;
+  chunkSize: number;
+  maxChunks: number;
+  pauseTime: number | null;
 }
 
 export const DeleteLogsTypeOverridesEmbedded = new Type<DeleteLogsTypeOverridesEmbedded>("DeleteLogsTypeOverridesEmbedded");
 export interface DeleteLogsTypeOverridesEmbedded extends Entities.EmbeddedEntity {
   Type: "DeleteLogsTypeOverridesEmbedded";
-  type?: Entities.Lite<TypeEntity>;
-  deleteLogsWithMoreThan?: number | null;
-  cleanLogsWithMoreThan?: number | null;
+  type: Entities.Lite<TypeEntity>;
+  deleteLogsWithMoreThan: number | null;
+  cleanLogsWithMoreThan: number | null;
 }
 
 export const ExceptionEntity = new Type<ExceptionEntity>("Exception");
 export interface ExceptionEntity extends Entities.Entity {
   Type: "Exception";
-  creationDate?: string;
-  exceptionType?: string | null;
-  exceptionMessage?: string;
-  exceptionMessageHash?: number;
-  stackTrace?: string;
-  stackTraceHash?: number;
-  threadId?: number;
-  user?: Entities.Lite<IUserEntity>;
-  environment?: string | null;
-  version?: string | null;
-  userAgent?: string | null;
-  requestUrl?: string | null;
-  controllerName?: string | null;
-  actionName?: string | null;
-  urlReferer?: string | null;
-  machineName?: string | null;
-  applicationName?: string | null;
-  userHostAddress?: string | null;
-  userHostName?: string | null;
-  form?: string | null;
-  queryString?: string | null;
-  session?: string | null;
-  data?: string | null;
-  hResult?: number;
-  referenced?: boolean;
+  creationDate: string;
+  exceptionType: string | null;
+  exceptionMessage: string;
+  exceptionMessageHash: number;
+  stackTrace: string;
+  stackTraceHash: number;
+  threadId: number;
+  user: Entities.Lite<IUserEntity>;
+  environment: string | null;
+  version: string | null;
+  userAgent: string | null;
+  requestUrl: string | null;
+  controllerName: string | null;
+  actionName: string | null;
+  urlReferer: string | null;
+  machineName: string | null;
+  applicationName: string | null;
+  userHostAddress: string | null;
+  userHostName: string | null;
+  form: string | null;
+  queryString: string | null;
+  session: string | null;
+  data: string | null;
+  hResult: number;
+  referenced: boolean;
 }
 
 export interface IUserEntity extends Entities.Entity {
@@ -88,8 +88,8 @@ export interface QueryEntity extends Entities.Entity {
 }
 
 export interface SemiSymbol extends Entities.Entity {
-  key?: string | null;
-  name?: string;
+  key: string | null;
+  name: string;
 }
 
 export const TypeEntity = new Type<TypeEntity>("Type");
diff --git a/Signum.React/Scripts/Signum.Entities.Patterns.ts b/Signum.React/Scripts/Signum.Entities.Patterns.ts
index 9aed945225..97291589f4 100644
--- a/Signum.React/Scripts/Signum.Entities.Patterns.ts
+++ b/Signum.React/Scripts/Signum.Entities.Patterns.ts
@@ -12,7 +12,7 @@ export module EntityMessage {
 }
 
 export interface LockableEntity extends Entities.Entity {
-  locked?: boolean;
+  locked: boolean;
 }
 
 
diff --git a/Signum.React/Scripts/Signum.Entities.ts b/Signum.React/Scripts/Signum.Entities.ts
index b33677adbd..a207a8a6ed 100644
--- a/Signum.React/Scripts/Signum.Entities.ts
+++ b/Signum.React/Scripts/Signum.Entities.ts
@@ -250,7 +250,7 @@ export module ConnectionMessage {
 export const CorruptMixin = new Type<CorruptMixin>("CorruptMixin");
 export interface CorruptMixin extends MixinEntity {
   Type: "CorruptMixin";
-  corrupt?: boolean;
+  corrupt: boolean;
 }
 
 export interface EmbeddedEntity extends ModifiableEntity {
@@ -281,7 +281,7 @@ export module EntityControlMessage {
 }
 
 export interface ImmutableEntity extends Entity {
-  allowChange?: boolean;
+  allowChange: boolean;
 }
 
 export module JavascriptMessage {
diff --git a/Signum.React/Signum.React.csproj b/Signum.React/Signum.React.csproj
index 35dcec7fe0..9f76b8e960 100644
--- a/Signum.React/Signum.React.csproj
+++ b/Signum.React/Signum.React.csproj
@@ -12,13 +12,9 @@
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
-    <NoWarn>1701;1702;8629</NoWarn>
-  </PropertyGroup>
-
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.App" />
-    <PackageReference Include="Microsoft.TypeScript.MSBuild" Version="3.3.1">
+    <PackageReference Include="Microsoft.TypeScript.MSBuild" Version="3.2.3">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
@@ -30,7 +26,7 @@
   
   <ItemGroup>
     <PackageReference Include="Signum.Analyzer" Version="1.0.1" />
-    <PackageReference Include="Signum.TSGenerator" Version="2.0.0-beta" />
+    <PackageReference Include="Signum.TSGenerator" Version="2.0.0-beta2" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/Signum.TSGenerator/EntityDeclarationGenerator.cs b/Signum.TSGenerator/EntityDeclarationGenerator.cs
index f4c543959f..38f4319ebf 100644
--- a/Signum.TSGenerator/EntityDeclarationGenerator.cs
+++ b/Signum.TSGenerator/EntityDeclarationGenerator.cs
@@ -434,7 +434,6 @@ public static CustomAttribute GetAttributeInherit(this TypeDefinition type, stri
                 return att;
 
             return GetAttributeInherit(type.BaseType?.Resolve(), attributeName);
-
         }
 
         public static bool? InTypeScript(this MemberReference mr)
@@ -455,13 +454,10 @@ public static bool GetTypescriptUndefined(this PropertyDefinition p)
 
             if (b != null)
                 return b.Value;
-
-            if (IsCollection(p.PropertyType))
-                return false;
-
-            return GetTypescriptUndefined(p.DeclaringType) ?? true;
+            
+            return GetTypescriptUndefined(p.DeclaringType) ?? false;
         }
-
+        
         private static bool? GetTypescriptUndefined(TypeDefinition declaringType)
         {
             var attr = GetAttributeInherit(declaringType, Cache.InTypeScriptAttribute.FullName);
@@ -476,10 +472,7 @@ public static bool GetTypescriptNull(this PropertyDefinition p)
             var b = attr == null ? null : (bool?)attr.Properties.SingleOrDefault(a => a.Name == "Null").Argument.Value;
             if (b != null)
                 return b.Value;
-
-            if (IsCollection(p.PropertyType))
-                return false;
-
+            
             if (p.PropertyType.IsValueType)
                 return p.PropertyType.IsNullable();
             else
@@ -614,14 +607,7 @@ public static IEnumerable<TypeReference> AllInterfaces(this TypeDefinition type)
         {
             return type.Interfaces.Select(a => a.InterfaceType).Concat(type.BaseType == null ? Enumerable.Empty<TypeReference>() : AllInterfaces(type.BaseType.Resolve()));
         }
-
-        public static bool IsCollection(this TypeReference type)
-        {
-            return type.FullName != typeof(string).FullName &&
-                type.FullName != typeof(byte[]).FullName &&
-                (type.IsArray || type.Resolve()?.Interfaces.Any(i => i.InterfaceType.FullName == typeof(IEnumerable).FullName) == true);
-        }
-
+        
         public static NamespaceTSReference GetNamespaceReference(Options options, TypeDefinition type)
         {
             AssemblyReference assemblyReference;
diff --git a/Signum.TSGenerator/Properties/launchSettings.json b/Signum.TSGenerator/Properties/launchSettings.json
index c7ae0b7438..3d6a108df1 100644
--- a/Signum.TSGenerator/Properties/launchSettings.json
+++ b/Signum.TSGenerator/Properties/launchSettings.json
@@ -1,9 +1,19 @@
 {
   "profiles": {
-    "Signum.TSGenerator": {
+    "Framework": {
       "commandName": "Project",
-      "commandLineArgs": "\"obj\\Debug\\netcoreapp2.1\\Signum.React.dll\" \"D:\\Signum\\Southwind\\Framework\\Signum.React\\obj\\SignumReferences.txt\" \"D:\\Signum\\Southwind\\Framework\\Signum.React\\obj\\SignumContent.txt\"",
+      "commandLineArgs": "\"obj\\Debug\\netcoreapp2.2\\Signum.React.dll\" \"D:\\Signum\\Southwind\\Framework\\Signum.React\\obj\\SignumReferences.txt\" \"D:\\Signum\\Southwind\\Framework\\Signum.React\\obj\\SignumContent.txt\"",
       "workingDirectory": "D:\\Signum\\Southwind\\Framework\\Signum.React\\"
+    },
+    "Extensions": {
+      "commandName": "Project",
+      "commandLineArgs": "\"obj\\Debug\\netcoreapp2.2\\Signum.Extensions.React.dll\" \"D:\\Signum\\Southwind\\Extensions\\Signum.React.Extensions\\obj\\SignumReferences.txt\" \"D:\\Signum\\Southwind\\Extensions\\Signum.React.Extensions\\obj\\SignumContent.txt\"",
+      "workingDirectory": "D:\\Signum\\Southwind\\Extensions\\Signum.React.Extensions\\"
+    },
+    "Southwind": {
+      "commandName": "Project",
+      "commandLineArgs": "\"obj\\Debug\\netcoreapp2.2\\Southwind.React.dll\" \"D:\\Signum\\Southwind\\Southwind.React\\obj\\SignumReferences.txt\" \"D:\\Signum\\Southwind\\Southwind.React\\obj\\SignumContent.txt\"",
+      "workingDirectory": "D:\\Signum\\Southwind\\Southwind.React\\"
     }
   }
 }
\ No newline at end of file
diff --git a/Signum.TSGenerator/Signum.TSGenerator.2.0.0-beta2.nupkg b/Signum.TSGenerator/Signum.TSGenerator.2.0.0-beta2.nupkg
new file mode 100644
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GIT binary patch
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zRT3zZ79)j6_69?hMFPCcQ)Tcuk+L-$7pj|06&{fS4dRm<+N9|{{CnqG(|-q6)n+pE
z{g!fS=y^#hdH6oFB*-Z!wIKjo?qJ5<>qNe1mm7<$p~1z1wVqq5Y|)nx__=&mgm2UD
zVPgaV)SUo6y*(hnepUQ1MyBQ-?r(qWuh#emyZn3u(&yAb`kX4LHS7V#Rsb^~n-kE{
z)xsF)#AX9@2ABYx0c?MfWGwcMcJ@F=XA969#_Zg@rkp?%Ab`i1%NXzu!1vae*OZTs
z&xpsAi`&$c)!xa*#Ms_Ny~}Y4#MQYKzE*F_vr?ppCI=Ci6{gUH;>F_?9&5^4seGr^
z(j8boZE5VBQ1ZHnxos<IP%b+<sbE~km8e@&Oz@Y*7A<P~ZY!in#P~2jr2q1wU+B}B
z^xF!>gafKpFP%V0kw@}ca=00>;0(YLov3XT9Ft2D=C7cn-L2B+ht)iWc#n6CI9p#~
z9!h$`sR)1Zcr-0;SFPrANcE=Zypx~9Xg(&Og8u|ZSR=xyNQJ3Q(`tn&8W@}(MMZm?
zaD6y!j;M?rODHr6iF+R_lJpHekapz}LnCFVb`8^t{lL&_1LsnP9OB&+DNem)qxKyV
zImu$%gPtbAB0LgNA96LCYdhi@>^C|?Y?0UwD`x^6ho1)>)^rVtJfg%w#x3w!#3=e4
zJp>*am6?Zac#j)Ia>$eSBDY@YT}16%AGJ~LyDRn8!?!o~8*s__=LmDDNpI*na7tt!
znUt<L69%$KjUrp-;IS_k-iYIBMYEtzR0{J!kn%FlsOa8ecMFFqWNK$fmr#wmQ{U@d
z0+Pnl=<~_Eg^rG7R}h3d;BOV>6gx|LLhe#M&!)=Xmx*lH?l<fe_H>mJd@_jsMi?W*
z*V>$+L+X76+r@hrWk>xpiQV)&@h6P9wTSy3EHY@bG1Gc>tWAZN?O^hdr%T{g2Z%U?
zgu;RNKMv(ztJ(bW_aQ9MY6bz?=#W8^f4><x0<E3cSpRzbvtZNZ`aKS)&^BoOB>cBh
z0-(5mfGllYoa}+d{~EL9&8@gdF`e%r0Lr0&{ol3vJ1GPd{C`wTMLSzNRtcc7g*7V(
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zX>}e(m_aE<5D-NFRu@D{=>J|9H9KP~r$1}+Cq78>Z#gJR|CRF(P5eje{FU@)FAjf)
zIi~!lr2p#E;a^+(ue?9q(!cX23jagiKP#qxhX09${vF;}^gj;&iw^zQ;D4e#{|<I4
z{tv<b7xw(uv_F^5Uo_<3H-}Q_|1lK#uc`lZ`1?C`^BVe}4u*dQ{CULqJK+2V`v3j$
YLq#4I?yrwP0}bzCKpW0IXoH3LUoJbN9{>OV

literal 0
HcmV?d00001

diff --git a/Signum.TSGenerator/Signum.TSGenerator.csproj b/Signum.TSGenerator/Signum.TSGenerator.csproj
index b9cf6bc8c8..e5ac2c61c6 100644
--- a/Signum.TSGenerator/Signum.TSGenerator.csproj
+++ b/Signum.TSGenerator/Signum.TSGenerator.csproj
@@ -9,7 +9,7 @@
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
     <LangVersion>latest</LangVersion>
     <Platforms>x64</Platforms>
-    <Version>2.0.0-beta</Version>
+    <Version>2.0.0-beta2</Version>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/Signum.TSGenerator/Signum.TSGenerator.nuspec b/Signum.TSGenerator/Signum.TSGenerator.nuspec
index 820edc202d..8d2408752d 100644
--- a/Signum.TSGenerator/Signum.TSGenerator.nuspec
+++ b/Signum.TSGenerator/Signum.TSGenerator.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>Signum.TSGenerator</id>
-    <version>2.0.0-beta</version>
+    <version>2.0.0-beta2</version>
     <title>TypeScript generator for Signum Framework applications</title>
     <authors>Olmo del Corral</authors>
     <licenseUrl>https://opensource.org/licenses/MIT</licenseUrl>
diff --git a/Signum.Test/Environment/Entities.cs b/Signum.Test/Environment/Entities.cs
index 91a05885e6..d824605606 100644
--- a/Signum.Test/Environment/Entities.cs
+++ b/Signum.Test/Environment/Entities.cs
@@ -160,7 +160,6 @@ public class BandEntity : Entity, IAuthorEntity
         [StringLengthValidator(Min = 3, Max = 100)]
         public string Name { get; set; }
 
-        [NotNullValidator]
         public MList<ArtistEntity> Members { get; set; } = new MList<ArtistEntity>();
 
         [ImplementedBy(typeof(GrammyAwardEntity), typeof(AmericanMusicAwardEntity))]
diff --git a/Signum.Utilities/Csv.cs b/Signum.Utilities/Csv.cs
index 4d135b1f1b..55acdb37bf 100644
--- a/Signum.Utilities/Csv.cs
+++ b/Signum.Utilities/Csv.cs
@@ -394,8 +394,7 @@ public class ParseCsvException : Exception
         public int? Row { get; set; }
         public string Member { get; set; }
         public string Value { get; set; }
-        
-        public ParseCsvException() { }
+
         public ParseCsvException(Exception inner) : base(inner.Message, inner)
         {
             this.Row = (int?)inner.Data["row"];
@@ -403,10 +402,6 @@ public ParseCsvException(Exception inner) : base(inner.Message, inner)
             this.Member = (string)inner.Data["member"];
 
         }
-        protected ParseCsvException(
-          System.Runtime.Serialization.SerializationInfo info,
-          System.Runtime.Serialization.StreamingContext context) : base(info, context)
-        { }
 
         public override string Message
         {
diff --git a/Signum.Utilities/DescriptionManager.cs b/Signum.Utilities/DescriptionManager.cs
index 2e878a970e..692a725941 100644
--- a/Signum.Utilities/DescriptionManager.cs
+++ b/Signum.Utilities/DescriptionManager.cs
@@ -376,7 +376,9 @@ public class LocalizedAssembly
         public CultureInfo Culture;
         public bool IsDefault;
 
-        private LocalizedAssembly() { }
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
+        LocalizedAssembly() { }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         public Dictionary<Type, LocalizedType> Types = new Dictionary<Type, LocalizedType>();
 
@@ -504,7 +506,9 @@ public class LocalizedType
 
         public Dictionary<string, string>? Members { get; set; }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
         LocalizedType() { }
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
 
         public XElement ExportXml()
         {
diff --git a/Signum.Utilities/ExpressionExpanderAttributes.cs b/Signum.Utilities/ExpressionExpanderAttributes.cs
index a79709e873..ee2ff85200 100644
--- a/Signum.Utilities/ExpressionExpanderAttributes.cs
+++ b/Signum.Utilities/ExpressionExpanderAttributes.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq.Expressions;
 using System.Reflection;
 
@@ -77,7 +77,6 @@ public sealed class EagerBindingAttribute : Attribute
     public sealed class ExpressionFieldAttribute : Attribute
     {
         public string Name { get; set; }
-        public Type Type { get; set; }
         /// <param name="name">The name of the field for the expression that defines the content. If not set, will be automatically found from the method body.</param>
         public ExpressionFieldAttribute(string name = "auto")
         {
diff --git a/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs b/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs
index 72346ef88e..4bfff7020f 100644
--- a/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs
+++ b/Signum.Utilities/ExpressionTrees/ExpressionCleaner.cs
@@ -20,6 +20,12 @@ public class ExpressionCleaner : ExpressionVisitor
 
         bool shortCircuit;
 
+        public ExpressionCleaner(Func<Expression, Expression> partialEval, bool shortCircuit)
+        {
+            this.partialEval = partialEval;
+            this.shortCircuit = shortCircuit;
+        }
+
         public static Expression? Clean(Expression? expr)
         {
             return Clean(expr, ExpressionEvaluator.PartialEval, true);
@@ -27,11 +33,7 @@ public class ExpressionCleaner : ExpressionVisitor
 
         public static Expression? Clean(Expression? expr, Func<Expression, Expression> partialEval, bool shortCircuit)
         {
-            ExpressionCleaner ee = new ExpressionCleaner()
-            {
-                partialEval = partialEval,
-                shortCircuit = shortCircuit
-            };
+            ExpressionCleaner ee = new ExpressionCleaner(partialEval, shortCircuit);
             var result = ee.Visit(expr);
             return partialEval(result);
         }
@@ -199,6 +201,8 @@ static bool IsStatic(MemberInfo mi)
 
         static readonly BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
 
+        
+
         static MemberInfo? GetMember(Type decType, MemberInfo mi)
         {
             if (mi is MethodInfo)
diff --git a/Signum.Utilities/Extensions/EnumerableExtensions.cs b/Signum.Utilities/Extensions/EnumerableExtensions.cs
index 0b8a9fcc71..3f89428ddf 100644
--- a/Signum.Utilities/Extensions/EnumerableExtensions.cs
+++ b/Signum.Utilities/Extensions/EnumerableExtensions.cs
@@ -1356,7 +1356,9 @@ public enum CollectionMessage
         MoreThanOne0Found,
     }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     public class JoinStrictResult<O, N, R>
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
     {
         public List<O> Extra;
         public List<N> Missing;
diff --git a/Signum.Utilities/Extensions/FileExtensions.cs b/Signum.Utilities/Extensions/FileExtensions.cs
index 17400c4bb1..195376dc3c 100644
--- a/Signum.Utilities/Extensions/FileExtensions.cs
+++ b/Signum.Utilities/Extensions/FileExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 
 namespace Signum.Utilities
@@ -34,7 +34,7 @@ public static void CreateParentDirectory(string filePath)
 
         public class TemporalFile : IDisposable
         {
-            string tempFile;
+            string tempFile = null!;
             public string Path
             {
                 get { return tempFile; }
diff --git a/Signum.Utilities/Extensions/TreeHelper.cs b/Signum.Utilities/Extensions/TreeHelper.cs
index 6e09b5e3b8..a77a250cac 100644
--- a/Signum.Utilities/Extensions/TreeHelper.cs
+++ b/Signum.Utilities/Extensions/TreeHelper.cs
@@ -8,7 +8,7 @@ namespace Signum.Utilities
 {
     public static class TreeHelper
     {
-        public static ObservableCollection<Node<T>> ToTreeC<T>(IEnumerable<T> collection, Func<T, T> getParent)
+        public static ObservableCollection<Node<T>> ToTreeC<T>(IEnumerable<T> collection, Func<T, T?> getParent)
             where T : class
         {
             Node<T> top = new Node<T>();
@@ -20,7 +20,7 @@ public static ObservableCollection<Node<T>> ToTreeC<T>(IEnumerable<T> collection
             createNode = item => dic.GetOrCreate(item, () =>
             {
                 Node<T> itemNode = new Node<T>(item);
-                T parent = getParent(item);
+                T? parent = getParent(item);
                 Node<T> parentNode = parent != null ? createNode(parent) : top;
                 parentNode.Children.Add(itemNode);
                 return itemNode;
@@ -148,6 +148,7 @@ public Node(T value)
 
         public Node()
         {
+            Value = default(T)!;
             Children = new ObservableCollection<Node<T>>();
         }
 
diff --git a/Signum.Utilities/NaturalLanguage/NaturalLanguageTools.cs b/Signum.Utilities/NaturalLanguage/NaturalLanguageTools.cs
index b40e5148b9..b42dfe4316 100644
--- a/Signum.Utilities/NaturalLanguage/NaturalLanguageTools.cs
+++ b/Signum.Utilities/NaturalLanguage/NaturalLanguageTools.cs
@@ -286,7 +286,9 @@ public interface INumberWriter
         string ToNumber(decimal number, NumberWriterSettings settings);
     }
 
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     public class NumberWriterSettings
+#pragma warning restore CS8618 // Non-nullable field is uninitialized.
     {
         public string Unit;
         public string UnitPlural;
diff --git a/Signum.Utilities/NotNullAttributes.cs b/Signum.Utilities/NotNullAttributes.cs
index 91db8e26c7..308553f626 100644
--- a/Signum.Utilities/NotNullAttributes.cs
+++ b/Signum.Utilities/NotNullAttributes.cs
@@ -8,7 +8,8 @@ namespace System.Runtime.CompilerServices
     [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false)]
     public class NullableAttribute : Attribute
     {
-        public NullableAttribute(byte b) {
+        public NullableAttribute(byte b)
+        {
             B = b;
         }
 
@@ -17,6 +18,18 @@ public NullableAttribute(byte[] bs)
             Bs = bs;
         }
 
+        public bool? IsNullableMain
+        {
+            get
+            {
+                var first = B ?? Bs![0];
+
+                return first == 1 ? (bool?)false :
+                    first == 2 ? (bool?)true :
+                    null;
+            }
+        }
+
         public byte? B { get; }
         public byte[]? Bs { get; }
     }
diff --git a/Signum.Utilities/Profiler/HeavyProfiler.cs b/Signum.Utilities/Profiler/HeavyProfiler.cs
index 458e4d609c..b37f97f444 100644
--- a/Signum.Utilities/Profiler/HeavyProfiler.cs
+++ b/Signum.Utilities/Profiler/HeavyProfiler.cs
@@ -298,7 +298,7 @@ public static HeavyProfilerEntry Find(string fullIndex)
             return entry!;
         }
     }
-
+#pragma warning disable CS8618 // Non-nullable field is uninitialized.
     [Serializable]
     public class HeavyProfilerEntry
     {
diff --git a/Signum.Utilities/Reflection/GenericInvoker.cs b/Signum.Utilities/Reflection/GenericInvoker.cs
index ace9897443..54f487601a 100644
--- a/Signum.Utilities/Reflection/GenericInvoker.cs
+++ b/Signum.Utilities/Reflection/GenericInvoker.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -96,11 +96,16 @@ protected override Expression VisitNew(NewExpression nex)
 
     class GeneratorVisitor : ExpressionVisitor
     {
-        Type[] types;
+        readonly Type[] types;
+
+        public GeneratorVisitor(Type[] types)
+        {
+            this.types = types;
+        }
 
         public static Expression<T> GetGenerator<T>(Expression<T> expression, Type[] types)
         {
-            return (Expression<T>)new GeneratorVisitor { types = types }.Visit(expression);
+            return (Expression<T>)new GeneratorVisitor(types).Visit(expression);
         }
 
         protected override Expression VisitMethodCall(MethodCallExpression m)
@@ -135,7 +140,7 @@ protected override Expression VisitLambda<T>(Expression<T> lambda)
         }
 
         static MethodInfo giInside = ReflectionTools.GetMethodInfo(() => Inside<string>(null)).GetGenericMethodDefinition();
-
+        
         static T Inside<T>(Func<T> lambda)
         {
             return HeavyProfiler.LogNoStackTrace("inside").Using(_ => lambda()); 
diff --git a/Signum.Utilities/Signum.Utilities.csproj b/Signum.Utilities/Signum.Utilities.csproj
index 0b16398a45..e1c63c87cd 100644
--- a/Signum.Utilities/Signum.Utilities.csproj
+++ b/Signum.Utilities/Signum.Utilities.csproj
@@ -9,10 +9,6 @@
     <Platforms>x64</Platforms>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
-    <NoWarn>1701;1702;8618</NoWarn>
-  </PropertyGroup>
-
   <ItemGroup>
     <None Update="Translations\*.xml">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
diff --git a/Signum.Utilities/Statics.cs b/Signum.Utilities/Statics.cs
index 01dc2aa263..3897aa022b 100644
--- a/Signum.Utilities/Statics.cs
+++ b/Signum.Utilities/Statics.cs
@@ -158,7 +158,7 @@ public override void Clean()
 
     public abstract class SessionVariable<T>: Variable<T>
     {
-        public abstract Func<T> ValueFactory { get; set; }
+        public abstract Func<T>? ValueFactory { get; set; }
 
         protected internal SessionVariable(string name)
             : base(name)
@@ -191,7 +191,7 @@ public SessionVariable<T> CreateVariable<T>(string name)
 
         class VoidVariable<T> : SessionVariable<T>
         {
-            public override Func<T> ValueFactory { get; set; }
+            public override Func<T>? ValueFactory { get; set; }
 
             public VoidVariable(string name)
                 : base(name)
@@ -227,7 +227,7 @@ public SessionVariable<T> CreateVariable<T>(string name)
 
         class SingletonVariable<T> : SessionVariable<T>
         {
-            public override Func<T> ValueFactory { get; set; }
+            public override Func<T>? ValueFactory { get; set; }
 
             public SingletonVariable(string name)
                 : base(name)
@@ -297,7 +297,7 @@ public OverrideableVariable(SessionVariable<T> variable)
                 this.variable = variable;
             }
             
-            public override Func<T> ValueFactory
+            public override Func<T>? ValueFactory
             {
                 get { return variable.ValueFactory; }
                 set { variable.ValueFactory = value; }
diff --git a/Signum.Utilities/StringDistance.cs b/Signum.Utilities/StringDistance.cs
index ed354281e4..313265dd48 100644
--- a/Signum.Utilities/StringDistance.cs
+++ b/Signum.Utilities/StringDistance.cs
@@ -376,7 +376,7 @@ public override string ToString()
         }
 
         
-        public List<DiffPair<List<DiffPair<string>>>> DiffText(string textOld, string textNew, bool lineEndingDifferences = true)
+        public List<DiffPair<List<DiffPair<string>>>> DiffText(string? textOld, string? textNew, bool lineEndingDifferences = true)
         {
             textOld = textOld ?? "";
             textNew = textNew ?? "";

From 28c71a1cb3a02ca2a2ab286e4ddc9f4b7bc36d7c Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Sat, 16 Feb 2019 05:43:40 +0100
Subject: [PATCH 22/25] fixes in no nullable

---
 Signum.Engine/Operations/Graph.cs               |  1 -
 Signum.Utilities/Extensions/StringExtensions.cs | 14 ++------------
 Signum.Utilities/Reflection/TupleExtensions.cs  |  4 +++-
 3 files changed, 5 insertions(+), 14 deletions(-)

diff --git a/Signum.Engine/Operations/Graph.cs b/Signum.Engine/Operations/Graph.cs
index acda29d67b..d19a8d4adf 100644
--- a/Signum.Engine/Operations/Graph.cs
+++ b/Signum.Engine/Operations/Graph.cs
@@ -459,7 +459,6 @@ public class Execute : _Execute<T>, IExecuteOperation
             Type? IOperation.ReturnType { get { return null; } }
             Type? IOperation.StateType { get { return null; } }
             public bool AvoidImplicitSave { get; set; }
-            public bool AvoidImplicitSave { get; set; }
 
             Type IEntityOperation.BaseType { get { return Symbol.BaseType; } }
             bool IEntityOperation.HasCanExecute { get { return CanExecute != null; } }
diff --git a/Signum.Utilities/Extensions/StringExtensions.cs b/Signum.Utilities/Extensions/StringExtensions.cs
index f9a3432c62..0773154ae1 100644
--- a/Signum.Utilities/Extensions/StringExtensions.cs
+++ b/Signum.Utilities/Extensions/StringExtensions.cs
@@ -34,10 +34,10 @@ public static string DefaultText(this string? str, string defaultText)
         }
 
 #pragma warning disable IDE0052 // Remove unread private members
-        static readonly Expression<Func<string, string>> EmtpyToNullExpression = a => a == null || a.Length == 0 ? null : a;
+        static readonly Expression<Func<string, string>> DefaultToNullExpression = a => a == null || a.Length == 0 ? null : a;
 #pragma warning restore IDE0052 // Remove unread private members
         [ExpressionField("EmtpyToNullExpression")]
-        public static string? EmtpyToNull(this string? str)
+        public static string? DefaultToNull(this string? str)
         {
             if (!str.HasText())
                 return null;
@@ -836,15 +836,5 @@ public static string[] SplitNoEmpty(this string text, params char[] separators)
         {
             return text.Split(separators, StringSplitOptions.RemoveEmptyEntries);
         }
-
-        public static string EmptyToNull(this string text)
-        {
-            return string.IsNullOrEmpty(text) ? null : text;
-        }
-
-        public static string WhiteSpaceToNull(this string text)
-        {
-            return string.IsNullOrWhiteSpace(text) ? null : text;
-        }
     }
 }
diff --git a/Signum.Utilities/Reflection/TupleExtensions.cs b/Signum.Utilities/Reflection/TupleExtensions.cs
index 4696ec5cef..2326b8796e 100644
--- a/Signum.Utilities/Reflection/TupleExtensions.cs
+++ b/Signum.Utilities/Reflection/TupleExtensions.cs
@@ -16,7 +16,9 @@ public static bool IsTuple(Type type)
 
         private static bool IsTupleDefinition(Type genericTypeDefinition)
         {
-            return genericTypeDefinition == TupleOf(genericTypeDefinition.GetGenericArguments().Length);
+            var numParameters = genericTypeDefinition.GetGenericArguments().Length;
+
+            return numParameters <= 8 && genericTypeDefinition == TupleOf(numParameters);
         }
 
         public static Type TupleOf(int numParameters)

From 3a4cd48368b9fd7c6892a525ed0f98532567dd3e Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Wed, 13 Mar 2019 17:21:56 +0100
Subject: [PATCH 23/25] update to new C# 8 beta

---
 .../CodeGeneration/ReactHookConverter.cs      | 16 ++--
 Signum.Engine/Database.cs                     |  6 +-
 Signum.Engine/DynamicQuery/DynamicQuery.cs    |  2 +-
 Signum.Engine/Engine/SchemaSynchronizer.cs    |  2 +-
 Signum.Engine/GlobalLazy.cs                   |  2 +-
 .../OverloadingSimplifier.cs                  | 86 +++++++++----------
 .../Linq/ExpressionVisitor/QueryBinder.cs     |  8 +-
 .../Linq/ExpressionVisitor/QueryFilterer.cs   |  8 +-
 .../ExpressionVisitor/TranslatorBuilder.cs    | 12 +--
 Signum.Engine/Operations/OperationLogic.cs    |  4 +-
 Signum.Engine/Patterns/DeletePart.cs          |  4 +-
 Signum.Engine/Retriever.cs                    |  2 +-
 Signum.Engine/Schema/Schema.Save.cs           | 16 ++--
 Signum.Entities/Basics/OperationLog.cs        |  2 +-
 Signum.Entities/DynamicQuery/QueryUtils.cs    |  2 +-
 .../DynamicQuery/Tokens/SystemTimeToken.cs    |  2 +-
 .../FieldNotificationAttributes.cs            |  2 +-
 Signum.Entities/Lite.cs                       |  2 +-
 Signum.Entities/ModifiableEntity.cs           |  2 +-
 Signum.React/Filters/SignumFilters.cs         |  2 +-
 Signum.React/Scripts/Modals.tsx               |  2 +
 Signum.Utilities/Csv.cs                       |  2 +-
 Signum.Utilities/ExpressionExpanderSamples.cs |  8 +-
 .../ExpressionTrees/ExpressionNominator.cs    |  4 +-
 .../Extensions/StringExtensions.cs            |  2 +-
 Signum.Utilities/Reflection/GenericInvoker.cs | 11 ---
 26 files changed, 100 insertions(+), 111 deletions(-)

diff --git a/Signum.Engine/CodeGeneration/ReactHookConverter.cs b/Signum.Engine/CodeGeneration/ReactHookConverter.cs
index d419addc54..75d334c3f8 100644
--- a/Signum.Engine/CodeGeneration/ReactHookConverter.cs
+++ b/Signum.Engine/CodeGeneration/ReactHookConverter.cs
@@ -14,7 +14,7 @@ public void ConvertFilesToHooks()
         {
             while (true)
             {
-                IEnumerable<string> files = GetFiles();
+                IEnumerable<string>? files = GetFiles();
 
                 if (files == null)
                     return;
@@ -32,7 +32,7 @@ public void ConvertFilesToHooks()
             }
         }
 
-        public virtual IEnumerable<string> GetFiles()
+        public virtual IEnumerable<string>? GetFiles()
         {
             string folder = GetFolder();
 
@@ -49,11 +49,11 @@ public virtual string GetFolder()
             return folder;
         }
 
-        public virtual IEnumerable<string> SelectFiles(string folder, IEnumerable<string> files)
+        public virtual IEnumerable<string>? SelectFiles(string folder, IEnumerable<string> files)
         {
             var result = files.Select(a => a.After(folder)).ChooseConsoleMultiple();
 
-            if (result.IsEmpty())
+            if (result == null)
                 return null;
 
             return result.Select(a => folder + a);
@@ -105,13 +105,13 @@ public virtual string SimplifyClass(string content, HashSet<string> hookImports)
 
             var pairs = matches.Select(m => new { isStart = true, m })
                 .Concat(endMatch.Select(m => new { isStart = false, m }))
-                .OrderBy(p => p.m.Index)
-                .BiSelect((start, end) => new { start, end })
+                .OrderBy(p => p.m!.Index)
+                .BiSelectC((start, end) => (start: start!, end: end!))
                 .Where(a => a.start.isStart && !a.end.isStart)
-                .Select(a => new { start = a.start.m, end = a.end.m })
+                .Select(a => (start: a.start.m, end: a.end.m))
                 .ToList();
 
-            string render = null;
+            string? render = null;
 
             foreach (var p in pairs.AsEnumerable().Reverse())
             {
diff --git a/Signum.Engine/Database.cs b/Signum.Engine/Database.cs
index 44a85af0e3..51ac660aaf 100644
--- a/Signum.Engine/Database.cs
+++ b/Signum.Engine/Database.cs
@@ -1119,7 +1119,7 @@ public static IQueryable<MListElement<E, V>> MListElementsLite<E, V>(this Lite<E
 
         class MListElementsExpander : IMethodExpander
         {
-            static readonly MethodInfo miMListQuery = ReflectionTools.GetMethodInfo(() => Database.MListQuery<Entity, int>(null)).GetGenericMethodDefinition();
+            static readonly MethodInfo miMListQuery = ReflectionTools.GetMethodInfo(() => Database.MListQuery<Entity, int>(null!)).GetGenericMethodDefinition();
             static readonly MethodInfo miWhere = ReflectionTools.GetMethodInfo(() => Queryable.Where<Entity>(null, a => false)).GetGenericMethodDefinition();
             static readonly MethodInfo miToLite = ReflectionTools.GetMethodInfo((Entity e) => e.ToLite()).GetGenericMethodDefinition();
 
@@ -1212,8 +1212,8 @@ static IQueryable<S> InDB<S, RT>(Lite<RT> lite)
 
         public class InDbExpander : IMethodExpander
         {
-            static readonly MethodInfo miSelect = ReflectionTools.GetMethodInfo(() => ((IQueryable<int>)null).Select(a => a)).GetGenericMethodDefinition();
-            static readonly MethodInfo miSingleEx = ReflectionTools.GetMethodInfo(() => ((IQueryable<int>)null).SingleEx()).GetGenericMethodDefinition();
+            static readonly MethodInfo miSelect = ReflectionTools.GetMethodInfo(() => ((IQueryable<int>)null!).Select(a => a)).GetGenericMethodDefinition();
+            static readonly MethodInfo miSingleEx = ReflectionTools.GetMethodInfo(() => ((IQueryable<int>)null!).SingleEx()).GetGenericMethodDefinition();
 
             public Expression Expand(Expression instance, Expression[] arguments, MethodInfo mi)
             {
diff --git a/Signum.Engine/DynamicQuery/DynamicQuery.cs b/Signum.Engine/DynamicQuery/DynamicQuery.cs
index da11b3f249..28219dcd66 100644
--- a/Signum.Engine/DynamicQuery/DynamicQuery.cs
+++ b/Signum.Engine/DynamicQuery/DynamicQuery.cs
@@ -801,7 +801,7 @@ public static DEnumerable<T> GroupBy<T>(this DEnumerable<T> collection, HashSet<
             return new DEnumerable<T>(resultCollection, newContext);
         }
 
-        static MethodInfo miGroupByQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy<string, int, double>((IQueryable<string>)null, (Expression<Func<string, int>>)null, (Expression<Func<int, IEnumerable<string>, double>>)null)).GetGenericMethodDefinition();
+        static MethodInfo miGroupByQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy<string, int, double>((IQueryable<string>)null!, (Expression<Func<string, int>>)null!, (Expression<Func<int, IEnumerable<string>, double>>)null!)).GetGenericMethodDefinition();
         public static DQueryable<T> GroupBy<T>(this DQueryable<T> query, HashSet<QueryToken> keyTokens, HashSet<AggregateToken> aggregateTokens)
         {
             var keySelector = KeySelector(query.Context, keyTokens);
diff --git a/Signum.Engine/Engine/SchemaSynchronizer.cs b/Signum.Engine/Engine/SchemaSynchronizer.cs
index 356fc46757..5176834fd9 100644
--- a/Signum.Engine/Engine/SchemaSynchronizer.cs
+++ b/Signum.Engine/Engine/SchemaSynchronizer.cs
@@ -649,7 +649,7 @@ private static Dictionary<string, DiffIndex> ApplyIndexAutoReplacements(DiffTabl
                 tabCol.ReferenceTable.Name.Name));
         }
 
-        public static Func<DiffTable, bool> IgnoreTable = null;
+        public static Func<DiffTable, bool>? IgnoreTable = null;
 
         public static Dictionary<string, DiffTable> DefaultGetDatabaseDescription(List<DatabaseName?> databases)
         {
diff --git a/Signum.Engine/GlobalLazy.cs b/Signum.Engine/GlobalLazy.cs
index 51bae85fdb..15ce4ee4f7 100644
--- a/Signum.Engine/GlobalLazy.cs
+++ b/Signum.Engine/GlobalLazy.cs
@@ -45,7 +45,7 @@ public static List<ResetLazyStats> Statistics()
         }
 
 
-        public static ResetLazy<T> WithoutInvalidations<T>(Func<T> func, LazyThreadSafetyMode mode = LazyThreadSafetyMode.ExecutionAndPublication) where T : class
+        public static ResetLazy<T> WithoutInvalidations<T>(Func<T> func, LazyThreadSafetyMode mode = LazyThreadSafetyMode.ExecutionAndPublication)
         {
             ResetLazy<T> result = new ResetLazy<T>(() =>
             {
diff --git a/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs b/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
index 9f38bad865..0a0efb2098 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/OverloadingSimplifier.cs
@@ -17,73 +17,73 @@ namespace Signum.Engine.Linq
     /// </summary>
     internal class OverloadingSimplifier : ExpressionVisitor
     {
-        public static MethodInfo miDistinctQ = ReflectionTools.GetMethodInfo(() => Queryable.Distinct((IQueryable<string>)null)).GetGenericMethodDefinition();
-        public static MethodInfo miDistinctE = ReflectionTools.GetMethodInfo(() => Enumerable.Distinct((IQueryable<string>)null)).GetGenericMethodDefinition();
+        public static MethodInfo miDistinctQ = ReflectionTools.GetMethodInfo(() => Queryable.Distinct((IQueryable<string>)null!)).GetGenericMethodDefinition();
+        public static MethodInfo miDistinctE = ReflectionTools.GetMethodInfo(() => Enumerable.Distinct((IQueryable<string>)null!)).GetGenericMethodDefinition();
 
-        public static MethodInfo miSelectQ = ReflectionTools.GetMethodInfo(() => Queryable.Select((IQueryable<string>)null, s => s)).GetGenericMethodDefinition();
-        public static MethodInfo miSelectE = ReflectionTools.GetMethodInfo(() => Enumerable.Select((IEnumerable<string>)null, s => s)).GetGenericMethodDefinition();
+        public static MethodInfo miSelectQ = ReflectionTools.GetMethodInfo(() => Queryable.Select((IQueryable<string>)null!, s => s)).GetGenericMethodDefinition();
+        public static MethodInfo miSelectE = ReflectionTools.GetMethodInfo(() => Enumerable.Select((IEnumerable<string>)null!, s => s)).GetGenericMethodDefinition();
 
-        static MethodInfo miGroupBySQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy((IQueryable<string>)null, s => s)).GetGenericMethodDefinition();
-        static MethodInfo miGroupBySE = ReflectionTools.GetMethodInfo(() => Enumerable.GroupBy((IEnumerable<string>)null, s => s)).GetGenericMethodDefinition();
+        static MethodInfo miGroupBySQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy((IQueryable<string>)null!, s => s)).GetGenericMethodDefinition();
+        static MethodInfo miGroupBySE = ReflectionTools.GetMethodInfo(() => Enumerable.GroupBy((IEnumerable<string>)null!, s => s)).GetGenericMethodDefinition();
 
-        static MethodInfo miGroupByNQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy((IQueryable<string>)null, s => s, s => s)).GetGenericMethodDefinition();
-        static MethodInfo miGroupByNE = ReflectionTools.GetMethodInfo(() => Enumerable.GroupBy((IQueryable<string>)null, s => s, s => s)).GetGenericMethodDefinition();
+        static MethodInfo miGroupByNQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy((IQueryable<string>)null!, s => s, s => s)).GetGenericMethodDefinition();
+        static MethodInfo miGroupByNE = ReflectionTools.GetMethodInfo(() => Enumerable.GroupBy((IQueryable<string>)null!, s => s, s => s)).GetGenericMethodDefinition();
 
-        static MethodInfo miGroupBySRQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy((IQueryable<string>)null, s => s, (s,g)=>s)).GetGenericMethodDefinition();
-        static MethodInfo miGroupBySRE = ReflectionTools.GetMethodInfo(() => Enumerable.GroupBy((IEnumerable<string>)null, s => s, (s, g) => s)).GetGenericMethodDefinition();
+        static MethodInfo miGroupBySRQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy((IQueryable<string>)null!, s => s, (s,g)=>s)).GetGenericMethodDefinition();
+        static MethodInfo miGroupBySRE = ReflectionTools.GetMethodInfo(() => Enumerable.GroupBy((IEnumerable<string>)null!, s => s, (s, g) => s)).GetGenericMethodDefinition();
 
-        static MethodInfo miGroupByNRQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy((IQueryable<string>)null, s => s, s => s, (s, g) => s)).GetGenericMethodDefinition();
-        static MethodInfo miGroupByNRE = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy((IQueryable<string>)null, s => s, s => s, (s, g) => s)).GetGenericMethodDefinition();
+        static MethodInfo miGroupByNRQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy((IQueryable<string>)null!, s => s, s => s, (s, g) => s)).GetGenericMethodDefinition();
+        static MethodInfo miGroupByNRE = ReflectionTools.GetMethodInfo(() => Queryable.GroupBy((IQueryable<string>)null!, s => s, s => s, (s, g) => s)).GetGenericMethodDefinition();
 
-        static MethodInfo miGroupJoinQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupJoin((IQueryable<string>)null, (IQueryable<string>)null, a => a, a => a, (a, g) => a)).GetGenericMethodDefinition();
-        static MethodInfo miGroupJoinE = ReflectionTools.GetMethodInfo(() => Enumerable.GroupJoin((IEnumerable<string>)null, (IEnumerable<string>)null, a => a, a => a, (a, g) => a)).GetGenericMethodDefinition();
+        static MethodInfo miGroupJoinQ = ReflectionTools.GetMethodInfo(() => Queryable.GroupJoin((IQueryable<string>)null!, (IQueryable<string>)null!, a => a, a => a, (a, g) => a)).GetGenericMethodDefinition();
+        static MethodInfo miGroupJoinE = ReflectionTools.GetMethodInfo(() => Enumerable.GroupJoin((IEnumerable<string>)null!, (IEnumerable<string>)null!, a => a, a => a, (a, g) => a)).GetGenericMethodDefinition();
 
-        static MethodInfo miJoinQ = ReflectionTools.GetMethodInfo(() => Queryable.Join((IQueryable<string>)null, (IQueryable<string>)null, a => a, a => a, (a, g) => a)).GetGenericMethodDefinition();
-        static MethodInfo miJoinE = ReflectionTools.GetMethodInfo(() => Enumerable.Join((IEnumerable<string>)null, (IEnumerable<string>)null, a => a, a => a, (a, g) => a)).GetGenericMethodDefinition();
+        static MethodInfo miJoinQ = ReflectionTools.GetMethodInfo(() => Queryable.Join((IQueryable<string>)null!, (IQueryable<string>)null!, a => a, a => a, (a, g) => a)).GetGenericMethodDefinition();
+        static MethodInfo miJoinE = ReflectionTools.GetMethodInfo(() => Enumerable.Join((IEnumerable<string>)null!, (IEnumerable<string>)null!, a => a, a => a, (a, g) => a)).GetGenericMethodDefinition();
 
         static MethodInfo miDefaultIfEmptyQ = ReflectionTools.GetMethodInfo(() => Queryable.DefaultIfEmpty<int>(null)).GetGenericMethodDefinition();
         static MethodInfo miDefaultIfEmptyE = ReflectionTools.GetMethodInfo(() => Enumerable.DefaultIfEmpty<int>(null)).GetGenericMethodDefinition();
 
-        static MethodInfo miCountE = ReflectionTools.GetMethodInfo(() => Enumerable.Count((IEnumerable<string>)null)).GetGenericMethodDefinition();
-        public static MethodInfo miWhereQ = ReflectionTools.GetMethodInfo(() => Queryable.Where((IQueryable<string>)null, a => false)).GetGenericMethodDefinition();
-        public static MethodInfo miWhereE = ReflectionTools.GetMethodInfo(() => Enumerable.Where((IEnumerable<string>)null, a=>false)).GetGenericMethodDefinition();
+        static MethodInfo miCountE = ReflectionTools.GetMethodInfo(() => Enumerable.Count((IEnumerable<string>)null!)).GetGenericMethodDefinition();
+        public static MethodInfo miWhereQ = ReflectionTools.GetMethodInfo(() => Queryable.Where((IQueryable<string>)null!, a => false)).GetGenericMethodDefinition();
+        public static MethodInfo miWhereE = ReflectionTools.GetMethodInfo(() => Enumerable.Where((IEnumerable<string>)null!, a=>false)).GetGenericMethodDefinition();
 
-        static MethodInfo miWhereIndexQ = ReflectionTools.GetMethodInfo(() => Queryable.Where((IQueryable<string>)null, (a, i) => false)).GetGenericMethodDefinition();
-        static MethodInfo miWhereIndexE = ReflectionTools.GetMethodInfo(() => Enumerable.Where((IEnumerable<string>)null, (a, i) => false)).GetGenericMethodDefinition();
+        static MethodInfo miWhereIndexQ = ReflectionTools.GetMethodInfo(() => Queryable.Where((IQueryable<string>)null!, (a, i) => false)).GetGenericMethodDefinition();
+        static MethodInfo miWhereIndexE = ReflectionTools.GetMethodInfo(() => Enumerable.Where((IEnumerable<string>)null!, (a, i) => false)).GetGenericMethodDefinition();
         
-        static MethodInfo miElementAtQ = ReflectionTools.GetMethodInfo(() => Queryable.ElementAt((IQueryable<string>)null, 0)).GetGenericMethodDefinition();
-        static MethodInfo miElementAtE = ReflectionTools.GetMethodInfo(() => Enumerable.ElementAt((IEnumerable<string>)null, 0)).GetGenericMethodDefinition();
+        static MethodInfo miElementAtQ = ReflectionTools.GetMethodInfo(() => Queryable.ElementAt((IQueryable<string>)null!, 0)).GetGenericMethodDefinition();
+        static MethodInfo miElementAtE = ReflectionTools.GetMethodInfo(() => Enumerable.ElementAt((IEnumerable<string>)null!, 0)).GetGenericMethodDefinition();
 
-        static MethodInfo miElementAtOrDefaultQ = ReflectionTools.GetMethodInfo(() => Queryable.ElementAtOrDefault((IQueryable<string>)null, 0)).GetGenericMethodDefinition();
-        static MethodInfo miElementAtOrDefaultE = ReflectionTools.GetMethodInfo(() => Enumerable.ElementAtOrDefault((IEnumerable<string>)null, 0)).GetGenericMethodDefinition();
+        static MethodInfo miElementAtOrDefaultQ = ReflectionTools.GetMethodInfo(() => Queryable.ElementAtOrDefault((IQueryable<string>)null!, 0)).GetGenericMethodDefinition();
+        static MethodInfo miElementAtOrDefaultE = ReflectionTools.GetMethodInfo(() => Enumerable.ElementAtOrDefault((IEnumerable<string>)null!, 0)).GetGenericMethodDefinition();
 
-        static MethodInfo miSkipQ = ReflectionTools.GetMethodInfo(() => Queryable.Skip((IQueryable<string>)null, 0)).GetGenericMethodDefinition();
-        static MethodInfo miSkipE = ReflectionTools.GetMethodInfo(() => Enumerable.Skip((IEnumerable<string>)null, 0)).GetGenericMethodDefinition();
+        static MethodInfo miSkipQ = ReflectionTools.GetMethodInfo(() => Queryable.Skip((IQueryable<string>)null!, 0)).GetGenericMethodDefinition();
+        static MethodInfo miSkipE = ReflectionTools.GetMethodInfo(() => Enumerable.Skip((IEnumerable<string>)null!, 0)).GetGenericMethodDefinition();
 
-        static MethodInfo miTakeQ = ReflectionTools.GetMethodInfo(() => Queryable.Take((IQueryable<string>)null, 0)).GetGenericMethodDefinition();
-        static MethodInfo miTakeE = ReflectionTools.GetMethodInfo(() => Enumerable.Take((IEnumerable<string>)null, 0)).GetGenericMethodDefinition();
+        static MethodInfo miTakeQ = ReflectionTools.GetMethodInfo(() => Queryable.Take((IQueryable<string>)null!, 0)).GetGenericMethodDefinition();
+        static MethodInfo miTakeE = ReflectionTools.GetMethodInfo(() => Enumerable.Take((IEnumerable<string>)null!, 0)).GetGenericMethodDefinition();
 
-        static MethodInfo miFirstQ = ReflectionTools.GetMethodInfo(() => Queryable.First((IQueryable<string>)null)).GetGenericMethodDefinition();
-        static MethodInfo miFirstE = ReflectionTools.GetMethodInfo(() => Enumerable.First((IEnumerable<string>)null)).GetGenericMethodDefinition();
+        static MethodInfo miFirstQ = ReflectionTools.GetMethodInfo(() => Queryable.First((IQueryable<string>)null!)).GetGenericMethodDefinition();
+        static MethodInfo miFirstE = ReflectionTools.GetMethodInfo(() => Enumerable.First((IEnumerable<string>)null!)).GetGenericMethodDefinition();
 
-        static MethodInfo miFirstOrDefaultQ = ReflectionTools.GetMethodInfo(() => Queryable.FirstOrDefault((IQueryable<string>)null)).GetGenericMethodDefinition();
-        static MethodInfo miFirstOrDefaultE = ReflectionTools.GetMethodInfo(() => Enumerable.FirstOrDefault((IEnumerable<string>)null)).GetGenericMethodDefinition();
+        static MethodInfo miFirstOrDefaultQ = ReflectionTools.GetMethodInfo(() => Queryable.FirstOrDefault((IQueryable<string>)null!)).GetGenericMethodDefinition();
+        static MethodInfo miFirstOrDefaultE = ReflectionTools.GetMethodInfo(() => Enumerable.FirstOrDefault((IEnumerable<string>)null!)).GetGenericMethodDefinition();
 
-        static MethodInfo miReverseQ = ReflectionTools.GetMethodInfo(() => Queryable.Reverse((IQueryable<string>)null)).GetGenericMethodDefinition();
-        static MethodInfo miReverseE = ReflectionTools.GetMethodInfo(() => Enumerable.Reverse((IEnumerable<string>)null)).GetGenericMethodDefinition();
+        static MethodInfo miReverseQ = ReflectionTools.GetMethodInfo(() => Queryable.Reverse((IQueryable<string>)null!)).GetGenericMethodDefinition();
+        static MethodInfo miReverseE = ReflectionTools.GetMethodInfo(() => Enumerable.Reverse((IEnumerable<string>)null!)).GetGenericMethodDefinition();
 
-        static MethodInfo miCastQ = ReflectionTools.GetMethodInfo(() => Queryable.Cast<int>((IQueryable<string>)null)).GetGenericMethodDefinition();
-        static MethodInfo miCastE = ReflectionTools.GetMethodInfo(() => Enumerable.Cast<int>((IEnumerable<string>)null)).GetGenericMethodDefinition();
+        static MethodInfo miCastQ = ReflectionTools.GetMethodInfo(() => Queryable.Cast<int>((IQueryable<string>)null!)).GetGenericMethodDefinition();
+        static MethodInfo miCastE = ReflectionTools.GetMethodInfo(() => Enumerable.Cast<int>((IEnumerable<string>)null!)).GetGenericMethodDefinition();
 
-        static MethodInfo miOfTypeQ = ReflectionTools.GetMethodInfo(() => Queryable.OfType<int>((IQueryable<string>)null)).GetGenericMethodDefinition();
-        static MethodInfo miOfTypeE = ReflectionTools.GetMethodInfo(() => Enumerable.OfType<int>((IEnumerable<string>)null)).GetGenericMethodDefinition();
+        static MethodInfo miOfTypeQ = ReflectionTools.GetMethodInfo(() => Queryable.OfType<int>((IQueryable<string>)null!)).GetGenericMethodDefinition();
+        static MethodInfo miOfTypeE = ReflectionTools.GetMethodInfo(() => Enumerable.OfType<int>((IEnumerable<string>)null!)).GetGenericMethodDefinition();
 
-        internal static MethodInfo miToString = ReflectionTools.GetMethodInfo(() => ((object)null).ToString());
+        internal static MethodInfo miToString = ReflectionTools.GetMethodInfo(() => ((object)null!).ToString());
         static MethodInfo miStringConcat = ReflectionTools.GetMethodInfo(() => string.Concat("", ""));
 
-        static MethodInfo miToStringSeparator = ReflectionTools.GetMethodInfo(() => EnumerableExtensions.ToString((IEnumerable<string>)null, " ")).GetGenericMethodDefinition();
-        static MethodInfo miToStringSeparatorE = ReflectionTools.GetMethodInfo(() => EnumerableExtensions.ToString((IEnumerable<string>)null, a => a, " ")).GetGenericMethodDefinition();
-        static MethodInfo miToStringSeparatorQ = ReflectionTools.GetMethodInfo(() => EnumerableExtensions.ToString((IQueryable<string>)null, a => a, " ")).GetGenericMethodDefinition();
+        static MethodInfo miToStringSeparator = ReflectionTools.GetMethodInfo(() => EnumerableExtensions.ToString((IEnumerable<string>)null!, " ")).GetGenericMethodDefinition();
+        static MethodInfo miToStringSeparatorE = ReflectionTools.GetMethodInfo(() => EnumerableExtensions.ToString((IEnumerable<string>)null!, a => a, " ")).GetGenericMethodDefinition();
+        static MethodInfo miToStringSeparatorQ = ReflectionTools.GetMethodInfo(() => EnumerableExtensions.ToString((IQueryable<string>)null!, a => a, " ")).GetGenericMethodDefinition();
 
 
         static int i = 0;
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
index 30ef635e43..be1cde168a 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryBinder.cs
@@ -755,7 +755,7 @@ bool ExtractDistinct(Expression? source, out Expression? innerSource)
             if (info != null)
             {
                 Expression? exp = aggregateFunction == AggregateSqlFunction.Count && selector == null ? null : //Count(*)
-                    aggregateFunction == AggregateSqlFunction.Count && !distinct ? MapVisitExpand(ToNotNullPredicate(selector), info.Projector, info.Source) :
+                    aggregateFunction == AggregateSqlFunction.Count && !distinct ? MapVisitExpand(ToNotNullPredicate(selector!), info.Projector, info.Source) :
                     selector != null ? MapVisitExpand(selector, info.Projector, info.Source) : //Sum(Amount), Avg(Amount), ...
                     info.Projector;
 
@@ -776,7 +776,7 @@ bool ExtractDistinct(Expression? source, out Expression? innerSource)
             else //Complicated SubQuery
             {
                 Expression? exp = aggregateFunction == AggregateSqlFunction.Count && selector == null ? null :
-                    aggregateFunction == AggregateSqlFunction.Count && !distinct ? MapVisitExpand(ToNotNullPredicate(selector), projection) :
+                    aggregateFunction == AggregateSqlFunction.Count && !distinct ? MapVisitExpand(ToNotNullPredicate(selector!), projection) :
                     selector != null ? MapVisitExpand(selector, projection) :
                     projection.Projector;
 
@@ -2360,8 +2360,8 @@ internal CommandExpression BindInsert(Expression source, LambdaExpression constr
             return (CommandAggregateExpression)QueryJoinExpander.ExpandJoins(result, this, cleanRequests: true);
         }
 
-        static readonly MethodInfo miSetReadonly = ReflectionTools.GetMethodInfo(() => UnsafeEntityExtensions.SetReadonly(null, (Entity a) => a.Id, 1)).GetGenericMethodDefinition();
-        static readonly MethodInfo miSetMixin = ReflectionTools.GetMethodInfo(() => ((Entity)null).SetMixin((CorruptMixin m) => m.Corrupt, true)).GetGenericMethodDefinition();
+        static readonly MethodInfo miSetReadonly = ReflectionTools.GetMethodInfo(() => UnsafeEntityExtensions.SetReadonly(null!, (Entity a) => a.Id, 1)).GetGenericMethodDefinition();
+        static readonly MethodInfo miSetMixin = ReflectionTools.GetMethodInfo(() => ((Entity)null!).SetMixin((CorruptMixin m) => m.Corrupt, true)).GetGenericMethodDefinition();
 
         public void FillColumnAssigments(List<ColumnAssignment> assignments, ParameterExpression toInsert, Expression body, Func<Expression, Expression> visitValue)
         {
diff --git a/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs b/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs
index dce2404f94..90341f48a9 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/QueryFilterer.cs
@@ -13,7 +13,7 @@ namespace Signum.Engine.Linq
 {
     public class QueryFilterer : ExpressionVisitor
     {
-        static GenericInvoker<Func<Schema, LambdaExpression>> giFilter = new GenericInvoker<Func<Schema, LambdaExpression>>(s => s.GetInDatabaseFilter<TypeEntity>());
+        static GenericInvoker<Func<Schema, LambdaExpression?>> giFilter = new GenericInvoker<Func<Schema, LambdaExpression?>>(s => s.GetInDatabaseFilter<TypeEntity>());
         static MethodInfo miWhere = ReflectionTools.GetMethodInfo((IQueryable<object> q) => q.Where(a => true)).GetGenericMethodDefinition();
 
         bool filter;
@@ -35,8 +35,7 @@ protected override Expression VisitConstant(ConstantExpression c)
                     {
                         if (typeof(Entity).IsAssignableFrom(queryType))
                         {
-                            LambdaExpression rawFilter = giFilter.GetInvoker(queryType)(Schema.Current);
-
+                            LambdaExpression? rawFilter = giFilter.GetInvoker(queryType)(Schema.Current);
                             if (rawFilter != null)
                             {
                                 Expression clean = ExpressionCleaner.Clean(rawFilter)!;
@@ -49,8 +48,7 @@ protected override Expression VisitConstant(ConstantExpression c)
                         {
                             Type entityType = queryType.GetGenericArguments()[0];
 
-                            LambdaExpression rawFilter = giFilter.GetInvoker(entityType)(Schema.Current);
-
+                            LambdaExpression? rawFilter = giFilter.GetInvoker(entityType)(Schema.Current);
                             if (rawFilter != null)
                             {
                                 var param = Expression.Parameter(queryType, "mle");
diff --git a/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs b/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs
index bc7aed2a05..b84e75fa0e 100644
--- a/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs
+++ b/Signum.Engine/Linq/ExpressionVisitor/TranslatorBuilder.cs
@@ -166,7 +166,7 @@ public class ProjectionBuilder : DbExpressionVisitor
 
             static readonly FieldInfo fiId = ReflectionTools.GetFieldInfo((Entity i) => i.id);
 
-            static readonly MethodInfo miCached = ReflectionTools.GetMethodInfo((IRetriever r) => r.Complete<TypeEntity>(null, null)).GetGenericMethodDefinition();
+            static readonly MethodInfo miCached = ReflectionTools.GetMethodInfo((IRetriever r) => r.Complete<TypeEntity>(null, null!)).GetGenericMethodDefinition();
             static readonly MethodInfo miRequest = ReflectionTools.GetMethodInfo((IRetriever r) => r.Request<TypeEntity>(null)).GetGenericMethodDefinition();
             static readonly MethodInfo miRequestIBA = ReflectionTools.GetMethodInfo((IRetriever r) => r.RequestIBA<TypeEntity>(null, null)).GetGenericMethodDefinition();
             static readonly MethodInfo miRequestLite = ReflectionTools.GetMethodInfo((IRetriever r) => r.RequestLite<TypeEntity>(null)).GetGenericMethodDefinition();
@@ -460,7 +460,7 @@ protected internal override Expression VisitLiteValue(LiteValueExpression lite)
                     return Expression.Call(retriever, miRequestLite.MakeGenericMethod(Lite.Extract(lite.Type)), liteConstructor);
             }
 
-            static readonly MethodInfo miLiteCreateParse = ReflectionTools.GetMethodInfo(() => LiteCreateParse(null, null, null, null));
+            static readonly MethodInfo miLiteCreateParse = ReflectionTools.GetMethodInfo(() => LiteCreateParse(null!, null, null!, null!));
 
             static Lite<Entity>? LiteCreateParse(Schema schema, PrimaryKey? typeId, string id, string toString)
             {
@@ -472,7 +472,7 @@ protected internal override Expression VisitLiteValue(LiteValueExpression lite)
                 return Lite.Create(type, PrimaryKey.Parse(id, type), toString);
             }
 
-            static MethodInfo miLiteCreate = ReflectionTools.GetMethodInfo(() => Lite.Create(null, 0, null));
+            static MethodInfo miLiteCreate = ReflectionTools.GetMethodInfo(() => Lite.Create(null!, 0, null));
 
             protected internal override Expression VisitMListElement(MListElementExpression mle)
             {
@@ -529,7 +529,7 @@ protected internal override Expression VisitPrimaryKeyString(PrimaryKeyStringExp
                 return Expression.Call(miTryParse, type, id);
             }
 
-            static readonly MethodInfo miTryParse = ReflectionTools.GetMethodInfo(() => TryParse(null, null));
+            static readonly MethodInfo miTryParse = ReflectionTools.GetMethodInfo(() => TryParse(null!, null!));
 
             
 
@@ -597,8 +597,8 @@ public Expression GetColumnExpression(Expression row, Alias alias, string name,
             return FieldReader.GetExpression(Expression.Property(row, miReader), position, type);
         }
 
-        static readonly MethodInfo miLookupRequest = ReflectionTools.GetMethodInfo((IProjectionRow row) => row.LookupRequest<int, double>(null, 0, null)).GetGenericMethodDefinition();
-        static readonly MethodInfo miLookup = ReflectionTools.GetMethodInfo((IProjectionRow row) => row.Lookup<int, double>(null, 0)).GetGenericMethodDefinition();
+        static readonly MethodInfo miLookupRequest = ReflectionTools.GetMethodInfo((IProjectionRow row) => row.LookupRequest<int, double>(null!, 0, null!)).GetGenericMethodDefinition();
+        static readonly MethodInfo miLookup = ReflectionTools.GetMethodInfo((IProjectionRow row) => row.Lookup<int, double>(null!, 0)).GetGenericMethodDefinition();
 
         public Expression LookupEager(Expression row, ChildProjectionExpression cProj)
         {
diff --git a/Signum.Engine/Operations/OperationLogic.cs b/Signum.Engine/Operations/OperationLogic.cs
index c1c9b4c13e..527d48671f 100644
--- a/Signum.Engine/Operations/OperationLogic.cs
+++ b/Signum.Engine/Operations/OperationLogic.cs
@@ -31,7 +31,7 @@ public static IQueryable<OperationLogEntity> OperationLogs(this Entity e)
 
 
         static Expression<Func<Entity, OperationLogEntity>> CurrentOperationLogExpression =
-            e => e.OperationLogs().Where(ol => ol.End.HasValue && e.SystemPeriod().Contains(ol.End.Value)).OrderBy(a => a.End.Value).FirstOrDefault();
+            e => e.OperationLogs().Where(ol => ol.End.HasValue && e.SystemPeriod().Contains(ol.End.Value)).OrderBy(a => a.End!.Value).FirstOrDefault();
         [ExpressionField]
         public static OperationLogEntity PreviousOperationLog(this Entity e)
         {
@@ -51,7 +51,7 @@ public static IQueryable<OperationLogEntity> Logs(this OperationSymbol o)
         static ResetLazy<Dictionary<OperationSymbol, List<Type>>> operationsFromKey = new ResetLazy<Dictionary<OperationSymbol, List<Type>>>(() =>
         {
             return (from t in operations.OverridenTypes
-                    from d in operations.GetDefinition(t).Keys
+                    from d in operations.GetDefinition(t)!.Keys
                     group t by d into g
                     select KVP.Create(g.Key, g.ToList())).ToDictionary();
         });
diff --git a/Signum.Engine/Patterns/DeletePart.cs b/Signum.Engine/Patterns/DeletePart.cs
index 63d605bab3..f5d7123e8f 100644
--- a/Signum.Engine/Patterns/DeletePart.cs
+++ b/Signum.Engine/Patterns/DeletePart.cs
@@ -26,7 +26,7 @@ public static IDisposable AvoidDeletePart(Type partType)
             return new Disposable(() => avoidTypes.Value = avoidTypes.Value.Pop());
         }
 
-        public static FluentInclude<T> WithDeletePart<T, L>(this FluentInclude<T> fi, Expression<Func<T, L>> relatedEntity, Func<T, bool> handleOnSaving = null)
+        public static FluentInclude<T> WithDeletePart<T, L>(this FluentInclude<T> fi, Expression<Func<T, L>> relatedEntity, Func<T, bool>? handleOnSaving = null)
             where T : Entity
             where L : Entity
         {
@@ -45,7 +45,7 @@ public static FluentInclude<T> WithDeletePart<T, L>(this FluentInclude<T> fi, Ex
             if (handleOnSaving != null)
                 fi.SchemaBuilder.Schema.EntityEvents<T>().Saving += e =>
                 {
-                    if (!e.IsNew && handleOnSaving(e))
+                    if (!e.IsNew && handleOnSaving!(e))
                     {
                         var lite = e.InDB().Select(relatedEntity).Select(a => a.ToLite()).SingleEx();
                         if(!lite.Is(relatedEntity.Evaluate(e)))
diff --git a/Signum.Engine/Retriever.cs b/Signum.Engine/Retriever.cs
index fbff836006..c398835d20 100644
--- a/Signum.Engine/Retriever.cs
+++ b/Signum.Engine/Retriever.cs
@@ -90,7 +90,7 @@ bool TryGetRequest((Type type, PrimaryKey id) key, out Entity value)
         }
 
         static GenericInvoker<Func<RealRetriever, PrimaryKey?, Entity>> giRequest =
-            new GenericInvoker<Func<RealRetriever, PrimaryKey?, Entity>>((rr, id) => rr.Request<Entity>(id));
+            new GenericInvoker<Func<RealRetriever, PrimaryKey?, Entity>>((rr, id) => rr.Request<Entity>(id)!);
         public T? Request<T>(PrimaryKey? id) where T : Entity
         {
             if (id == null)
diff --git a/Signum.Engine/Schema/Schema.Save.cs b/Signum.Engine/Schema/Schema.Save.cs
index 71091ac51a..88aa70c43a 100644
--- a/Signum.Engine/Schema/Schema.Save.cs
+++ b/Signum.Engine/Schema/Schema.Save.cs
@@ -1238,9 +1238,9 @@ internal Expression ConvertTicks(ParameterExpression paramOldTicks)
 
     public static partial class FieldReferenceExtensions
     {
-        static MethodInfo miGetIdForLite = ReflectionTools.GetMethodInfo(() => GetIdForLite(null, new Forbidden()));
-        static MethodInfo miGetIdForEntity = ReflectionTools.GetMethodInfo(() => GetIdForEntity(null, new Forbidden()));
-        static MethodInfo miGetIdForLiteCleanEntity = ReflectionTools.GetMethodInfo(() => GetIdForLiteCleanEntity(null, new Forbidden()));
+        static MethodInfo miGetIdForLite = ReflectionTools.GetMethodInfo(() => GetIdForLite(null!, new Forbidden()));
+        static MethodInfo miGetIdForEntity = ReflectionTools.GetMethodInfo(() => GetIdForEntity(null!, new Forbidden()));
+        static MethodInfo miGetIdForLiteCleanEntity = ReflectionTools.GetMethodInfo(() => GetIdForLiteCleanEntity(null!, new Forbidden()));
 
         public static void AssertIsLite(this IFieldReference fr)
         {
@@ -1299,8 +1299,8 @@ public static Expression GetIdFactory(this IFieldReference fr, Expression value,
             return forbidden.Contains(ie) ? (PrimaryKey?)null : ie.Id;
         }
 
-        static MethodInfo miGetTypeForLite = ReflectionTools.GetMethodInfo(() => GetTypeForLite(null, new Forbidden()));
-        static MethodInfo miGetTypeForEntity = ReflectionTools.GetMethodInfo(() => GetTypeForEntity(null, new Forbidden()));
+        static MethodInfo miGetTypeForLite = ReflectionTools.GetMethodInfo(() => GetTypeForLite(null!, new Forbidden()));
+        static MethodInfo miGetTypeForEntity = ReflectionTools.GetMethodInfo(() => GetTypeForEntity(null!, new Forbidden()));
 
         public static Expression GetTypeFactory(this IFieldReference fr, Expression value, Expression forbidden)
         {
@@ -1368,7 +1368,7 @@ protected internal override void CreateParameter(List<Table.Trio> trios, List<Ex
             }
         }
 
-        static MethodInfo miCheckType = ReflectionTools.GetMethodInfo((FieldImplementedBy fe) => fe.CheckType(null));
+        static MethodInfo miCheckType = ReflectionTools.GetMethodInfo((FieldImplementedBy fe) => fe.CheckType(null!));
 
         Type CheckType(Type type)
         {
@@ -1394,7 +1394,7 @@ protected internal override void CreateParameter(List<Table.Trio> trios, List<Ex
         }
 
         static MethodInfo miUnWrapToString = ReflectionTools.GetMethodInfo(() => PrimaryKey.UnwrapToString(null));
-        static MethodInfo miConvertType = ReflectionTools.GetMethodInfo(() => ConvertType(null));
+        static MethodInfo miConvertType = ReflectionTools.GetMethodInfo(() => ConvertType(null!));
 
         static IComparable? ConvertType(Type type)
         {
@@ -1432,7 +1432,7 @@ protected internal override void CreateParameter(List<Table.Trio> trios, List<Ex
             }
         }
 
-        static MethodInfo miCheckNull = ReflectionTools.GetMethodInfo((FieldEmbedded fe) => fe.CheckNull(null));
+        static MethodInfo miCheckNull = ReflectionTools.GetMethodInfo((FieldEmbedded fe) => fe.CheckNull(null!));
         object CheckNull(object obj)
         {
             if (obj == null)
diff --git a/Signum.Entities/Basics/OperationLog.cs b/Signum.Entities/Basics/OperationLog.cs
index c16352d81b..15926cb251 100644
--- a/Signum.Entities/Basics/OperationLog.cs
+++ b/Signum.Entities/Basics/OperationLog.cs
@@ -23,7 +23,7 @@ public class OperationLogEntity : Entity
         public DateTime? End { get; set; }
 
         static Expression<Func<OperationLogEntity, double?>> DurationExpression =
-            log => (double?)(log.End - log.Start).Value.TotalMilliseconds;
+            log => (double?)(log.End - log.Start)!.Value.TotalMilliseconds;
 #pragma warning disable SF0002 // Use ExpressionFieldAttribute in non-trivial method or property
         [ExpressionField("DurationExpression"), Unit("ms")]
 #pragma warning restore SF0002 // Use ExpressionFieldAttribute in non-trivial method or property
diff --git a/Signum.Entities/DynamicQuery/QueryUtils.cs b/Signum.Entities/DynamicQuery/QueryUtils.cs
index c0ef15ae9d..376afe3a4b 100644
--- a/Signum.Entities/DynamicQuery/QueryUtils.cs
+++ b/Signum.Entities/DynamicQuery/QueryUtils.cs
@@ -298,7 +298,7 @@ private static IEnumerable<QueryToken> AggregateTokens(QueryToken? token, QueryD
             }
         }
 
-        public static Func<bool> MergeEntityColumns = null;
+        public static Func<bool>? MergeEntityColumns = null;
         static List<QueryToken> SubTokensBasic(QueryToken? token, QueryDescription qd, SubTokensOptions options)
         {
             if (token == null)
diff --git a/Signum.Entities/DynamicQuery/Tokens/SystemTimeToken.cs b/Signum.Entities/DynamicQuery/Tokens/SystemTimeToken.cs
index 3de3c8050a..34876a1b32 100644
--- a/Signum.Entities/DynamicQuery/Tokens/SystemTimeToken.cs
+++ b/Signum.Entities/DynamicQuery/Tokens/SystemTimeToken.cs
@@ -37,7 +37,7 @@ public override string Key
         {
             get { return this.property.ToString(); }
         }
-        static MethodInfo miSystemPeriod = ReflectionTools.GetMethodInfo((object o) => SystemTimeExtensions.SystemPeriod(null));
+        static MethodInfo miSystemPeriod = ReflectionTools.GetMethodInfo((object o) => SystemTimeExtensions.SystemPeriod(null!));
 
         protected override Expression BuildExpressionInternal(BuildExpressionContext context)
         {
diff --git a/Signum.Entities/FieldNotificationAttributes.cs b/Signum.Entities/FieldNotificationAttributes.cs
index a649ff2957..a6554a35e5 100644
--- a/Signum.Entities/FieldNotificationAttributes.cs
+++ b/Signum.Entities/FieldNotificationAttributes.cs
@@ -26,7 +26,7 @@ internal static class AttributeManager<T>
         where T : Attribute
     {
         //Consider using ImmutableAVLTree instead
-        readonly static Dictionary<Type, TypeAttributePack?> fieldAndProperties = new Dictionary<Type, TypeAttributePack>();
+        readonly static Dictionary<Type, TypeAttributePack?> fieldAndProperties = new Dictionary<Type, TypeAttributePack?>();
 
         static TypeAttributePack? GetFieldsAndProperties(Type type)
         {
diff --git a/Signum.Entities/Lite.cs b/Signum.Entities/Lite.cs
index f3b1cf5006..70b1b16e6e 100644
--- a/Signum.Entities/Lite.cs
+++ b/Signum.Entities/Lite.cs
@@ -75,7 +75,7 @@ public LiteImp(PrimaryKey id, string? toStr)
                 this.Modified = ModifiedState.Clean;
             }
 
-            public LiteImp(T entity, string toStr)
+            public LiteImp(T entity, string? toStr)
             {
                 if (typeof(T).IsAbstract)
                     throw new InvalidOperationException(typeof(T).Name + " is abstract");
diff --git a/Signum.Entities/ModifiableEntity.cs b/Signum.Entities/ModifiableEntity.cs
index aaecbc8e32..c0bac116f2 100644
--- a/Signum.Entities/ModifiableEntity.cs
+++ b/Signum.Entities/ModifiableEntity.cs
@@ -27,7 +27,7 @@ public interface IModifiableEntity : INotifyPropertyChanged, IDataErrorInfo
     [Serializable, DescriptionOptions(DescriptionOptions.Members | DescriptionOptions.Description), InTypeScript(false)]
     public abstract class ModifiableEntity : Modifiable, IModifiableEntity, ICloneable
     {
-        static Func<bool> isRetrievingFunc = null;
+        static Func<bool>? isRetrievingFunc = null;
         static public bool IsRetrieving
         {
             get { return isRetrievingFunc != null && isRetrievingFunc(); }
diff --git a/Signum.React/Filters/SignumFilters.cs b/Signum.React/Filters/SignumFilters.cs
index ad6aef32d9..ef5f9d06d2 100644
--- a/Signum.React/Filters/SignumFilters.cs
+++ b/Signum.React/Filters/SignumFilters.cs
@@ -43,7 +43,7 @@ public class SignumAuthenticationFilter : SignumDisposableResourceFilter
     {
         public SignumAuthenticationFilter() : base("Signum_User"){ }
 
-        public static readonly IList<Func<FilterContext, SignumAuthenticationResult?>> Authenticators = new List<Func<FilterContext, SignumAuthenticationResult>>();
+        public static readonly IList<Func<FilterContext, SignumAuthenticationResult?>> Authenticators = new List<Func<FilterContext, SignumAuthenticationResult?>>();
 
         private static SignumAuthenticationResult? Authenticate(ResourceExecutingContext actionContext)
         {
diff --git a/Signum.React/Scripts/Modals.tsx b/Signum.React/Scripts/Modals.tsx
index 358f32fd72..a284528710 100644
--- a/Signum.React/Scripts/Modals.tsx
+++ b/Signum.React/Scripts/Modals.tsx
@@ -1,6 +1,7 @@
 import * as Navigator from './Navigator';
 
 import * as React from 'react'
+import { FunctionalAdapter } from './Frames/FrameModal';
 
 export interface IModalProps {
   onExited?: (val: any) => void;
@@ -12,6 +13,7 @@ export interface GlobalModalContainerState {
 }
 
 let current: GlobalModalContainer;
+let modalInstances: React.Component[] = [];
 
 export class GlobalModalContainer extends React.Component<{}, GlobalModalContainerState> {
   constructor(props: {}) {
diff --git a/Signum.Utilities/Csv.cs b/Signum.Utilities/Csv.cs
index 55acdb37bf..cf997a8e63 100644
--- a/Signum.Utilities/Csv.cs
+++ b/Signum.Utilities/Csv.cs
@@ -18,7 +18,7 @@ public static class Csv
         // Default changed since Excel exports not to UTF8 and https://stackoverflow.com/questions/49215791/vs-code-c-sharp-system-notsupportedexception-no-data-is-available-for-encodin
         public static Encoding DefaultEncoding => Encoding.UTF8; 
 
-        public static CultureInfo DefaultCulture = null;
+        public static CultureInfo? DefaultCulture = null;
 
         public static string ToCsvFile<T>(this IEnumerable<T> collection, string fileName, Encoding? encoding = null, CultureInfo? culture = null, bool writeHeaders = true, bool autoFlush = false, bool append = false,
             Func<CsvColumnInfo<T>, CultureInfo, Func<object, string>>? toStringFactory = null)
diff --git a/Signum.Utilities/ExpressionExpanderSamples.cs b/Signum.Utilities/ExpressionExpanderSamples.cs
index dcd0f7be03..34707ca5d3 100644
--- a/Signum.Utilities/ExpressionExpanderSamples.cs
+++ b/Signum.Utilities/ExpressionExpanderSamples.cs
@@ -114,10 +114,10 @@ public Expression Expand(Expression instance, Expression[] parameters, MethodInf
 
     class ExpandNone : IMethodExpander 
     {
-        static readonly MethodInfo miAnyEnumerable = ReflectionTools.GetMethodInfo(() => Enumerable.Any((IEnumerable<string>)null)).GetGenericMethodDefinition();
-        static readonly MethodInfo miAnyQueryable = ReflectionTools.GetMethodInfo(() =>Queryable.Any((IQueryable<string>)null)).GetGenericMethodDefinition();
-        static readonly MethodInfo miAnyEnumerableWithPredicate = ReflectionTools.GetMethodInfo(() =>Enumerable.Any((IEnumerable<string>)null, null)).GetGenericMethodDefinition();
-        static readonly MethodInfo miAnyQueryableWithPredicate  = ReflectionTools.GetMethodInfo(() => Queryable.Any((IQueryable<string>)null, null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAnyEnumerable = ReflectionTools.GetMethodInfo(() => Enumerable.Any((IEnumerable<string>)null!)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAnyQueryable = ReflectionTools.GetMethodInfo(() =>Queryable.Any((IQueryable<string>)null!)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAnyEnumerableWithPredicate = ReflectionTools.GetMethodInfo(() =>Enumerable.Any((IEnumerable<string>)null!, null)).GetGenericMethodDefinition();
+        static readonly MethodInfo miAnyQueryableWithPredicate  = ReflectionTools.GetMethodInfo(() => Queryable.Any((IQueryable<string>)null!, null)).GetGenericMethodDefinition();
 
         public Expression Expand(Expression instance, Expression[] arguments, MethodInfo mi)
         {
diff --git a/Signum.Utilities/ExpressionTrees/ExpressionNominator.cs b/Signum.Utilities/ExpressionTrees/ExpressionNominator.cs
index 814fc3a878..010d9caa36 100644
--- a/Signum.Utilities/ExpressionTrees/ExpressionNominator.cs
+++ b/Signum.Utilities/ExpressionTrees/ExpressionNominator.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -113,7 +113,7 @@ public static IQueryable<T> OrderAlsoByKeys<T>(this IQueryable<T> source)
 
 
         [MethodExpander(typeof(DistinctNullExpander))]
-        public static bool DistinctNull<T>(T a, T b) where T : class
+        public static bool DistinctNull<T>(T? a, T? b) where T : class
         {
             return (a == null && b != null) ||
                   (a != null && b == null) ||
diff --git a/Signum.Utilities/Extensions/StringExtensions.cs b/Signum.Utilities/Extensions/StringExtensions.cs
index 0773154ae1..25c79d90f4 100644
--- a/Signum.Utilities/Extensions/StringExtensions.cs
+++ b/Signum.Utilities/Extensions/StringExtensions.cs
@@ -34,7 +34,7 @@ public static string DefaultText(this string? str, string defaultText)
         }
 
 #pragma warning disable IDE0052 // Remove unread private members
-        static readonly Expression<Func<string, string>> DefaultToNullExpression = a => a == null || a.Length == 0 ? null : a;
+        static readonly Expression<Func<string, string?>> DefaultToNullExpression = a => a == null || a.Length == 0 ? null : a;
 #pragma warning restore IDE0052 // Remove unread private members
         [ExpressionField("EmtpyToNullExpression")]
         public static string? DefaultToNull(this string? str)
diff --git a/Signum.Utilities/Reflection/GenericInvoker.cs b/Signum.Utilities/Reflection/GenericInvoker.cs
index 54f487601a..be80c07e42 100644
--- a/Signum.Utilities/Reflection/GenericInvoker.cs
+++ b/Signum.Utilities/Reflection/GenericInvoker.cs
@@ -128,10 +128,6 @@ protected override Expression VisitLambda<T>(Expression<T> lambda)
 
             Expression body = Convert(this.Visit(lambda.Body), returnType);
 
-            //if (returnType != typeof(void))
-            //    body = Expression.Call(giInside.MakeGenericMethod(returnType),
-            //        Expression.Lambda(body));
-
             if (body != lambda.Body)
             {
                 return Expression.Lambda(lambda.Type, body, lambda.Parameters);
@@ -139,13 +135,6 @@ protected override Expression VisitLambda<T>(Expression<T> lambda)
             return lambda;
         }
 
-        static MethodInfo giInside = ReflectionTools.GetMethodInfo(() => Inside<string>(null)).GetGenericMethodDefinition();
-        
-        static T Inside<T>(Func<T> lambda)
-        {
-            return HeavyProfiler.LogNoStackTrace("inside").Using(_ => lambda()); 
-        }
-
         private Expression Convert(Expression result, Type type)
         {
             if (result.Type == type)

From fb5206ac62f320c81c5c11098efee68ba3cef96c Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Thu, 14 Mar 2019 08:24:56 +0100
Subject: [PATCH 24/25] initial handleKeyDown in GlobalModalContainer

---
 Signum.React/Scripts/Frames/ButtonBar.tsx  |  8 +-----
 Signum.React/Scripts/Frames/FrameModal.tsx |  9 +++++--
 Signum.React/Scripts/Frames/FramePage.tsx  | 14 +++++++++-
 Signum.React/Scripts/Modals.tsx            | 31 ++++++++++++++++++++--
 Signum.React/Scripts/SelectorModal.tsx     |  1 -
 5 files changed, 50 insertions(+), 13 deletions(-)

diff --git a/Signum.React/Scripts/Frames/ButtonBar.tsx b/Signum.React/Scripts/Frames/ButtonBar.tsx
index 95e5639c95..4b512810c0 100644
--- a/Signum.React/Scripts/Frames/ButtonBar.tsx
+++ b/Signum.React/Scripts/Frames/ButtonBar.tsx
@@ -13,13 +13,7 @@ export default class ButtonBar extends React.Component<ButtonBarProps>{
 
   static onButtonBarRender: Array<(ctx: ButtonsContext) => Array<ButtonBarElement | undefined> | undefined> = [];
 
-  componentDidMount() {
-    window.addEventListener("keydown", this.hanldleKeyDown);
-  }
-
-  componentWillUnmount() {
-    window.removeEventListener("keydown", this.hanldleKeyDown);
-  }
+ 
 
   hanldleKeyDown = (e: KeyboardEvent) => {
     var s = this.shortcuts;
diff --git a/Signum.React/Scripts/Frames/FrameModal.tsx b/Signum.React/Scripts/Frames/FrameModal.tsx
index 10d5d27570..68a4f0583e 100644
--- a/Signum.React/Scripts/Frames/FrameModal.tsx
+++ b/Signum.React/Scripts/Frames/FrameModal.tsx
@@ -1,6 +1,6 @@
 
 import * as React from 'react'
-import { openModal, IModalProps } from '../Modals'
+import { openModal, IModalProps, IHandleKeyboard } from '../Modals'
 import MessageModal from '../Modals/MessageModal'
 import * as Navigator from '../Navigator'
 import ButtonBar from './ButtonBar'
@@ -48,7 +48,7 @@ interface FrameModalState {
 
 let modalCount = 0;
 
-export default class FrameModal extends React.Component<FrameModalProps, FrameModalState>  {
+export default class FrameModal extends React.Component<FrameModalProps, FrameModalState> implements IHandleKeyboard  {
   prefix = "modal" + (modalCount++);
 
   static defaultProps: FrameModalProps = {
@@ -77,6 +77,9 @@ export default class FrameModal extends React.Component<FrameModalProps, FrameMo
       .done();
   }
 
+  handleKeyDown(e: KeyboardEvent) {
+    this.buttonBar && this.buttonBar.hanldleKeyDown(e);
+  }
 
   getTypeName() {
     return (this.props.entityOrPack as Lite<Entity>).EntityType ||
@@ -230,6 +233,8 @@ export default class FrameModal extends React.Component<FrameModalProps, FrameMo
     }
   }
 
+  buttonBar?: ButtonBar | null;
+
   renderBody() {
 
     const frame: EntityFrame = {
diff --git a/Signum.React/Scripts/Frames/FramePage.tsx b/Signum.React/Scripts/Frames/FramePage.tsx
index 9f35bbf5d5..83e7f29915 100644
--- a/Signum.React/Scripts/Frames/FramePage.tsx
+++ b/Signum.React/Scripts/Frames/FramePage.tsx
@@ -35,6 +35,10 @@ export default class FramePage extends React.Component<FramePageProps, FramePage
     this.load(this.props);
   }
 
+  componentDidMount() {
+    window.addEventListener("keydown", this.hanldleKeyDown);
+  }
+
   getTypeInfo(): TypeInfo {
     return getTypeInfo(this.props.match.params.type);
   }
@@ -59,6 +63,12 @@ export default class FramePage extends React.Component<FramePageProps, FramePage
 
   componentWillUnmount() {
     Navigator.setTitle();
+    window.removeEventListener("keydown", this.hanldleKeyDown);
+  }
+
+  hanldleKeyDown = (e: KeyboardEvent) => {
+    if (!e.defaultPrevented)
+      this.buttonBar && this.buttonBar.hanldleKeyDown(e);
   }
 
   load(props: FramePageProps) {
@@ -131,6 +141,8 @@ export default class FramePage extends React.Component<FramePageProps, FramePage
     }
   }
 
+  buttonBar?: ButtonBar | null;
+
   render() {
 
     if (!this.state.pack) {
@@ -186,7 +198,7 @@ export default class FramePage extends React.Component<FramePageProps, FramePage
       <div className="normal-control">
         {this.renderTitle()}
         {renderWidgets(wc)}
-        {this.entityComponent && <ButtonBar frame={frame} pack={this.state.pack} />}
+        {this.entityComponent && <ButtonBar ref={bb => this.buttonBar = bb} frame={frame} pack={this.state.pack} />}
         <ValidationErrors entity={this.state.pack.entity} ref={ve => this.validationErrors = ve} prefix="framePage" />
         {embeddedWidgets.top}
         <div className="sf-main-control" data-test-ticks={new Date().valueOf()} data-main-entity={entityInfo(ctx.value)}>
diff --git a/Signum.React/Scripts/Modals.tsx b/Signum.React/Scripts/Modals.tsx
index a284528710..3bf481fa48 100644
--- a/Signum.React/Scripts/Modals.tsx
+++ b/Signum.React/Scripts/Modals.tsx
@@ -2,18 +2,25 @@ import * as Navigator from './Navigator';
 
 import * as React from 'react'
 import { FunctionalAdapter } from './Frames/FrameModal';
+import { Modal } from 'react-overlays';
 
 export interface IModalProps {
   onExited?: (val: any) => void;
 }
 
+
+export interface IHandleKeyboard {
+  handleKeyDown?: (e: KeyboardEvent) => void;
+}
+
 export interface GlobalModalContainerState {
   modals: React.ReactElement<IModalProps>[];
   currentUrl: string;
 }
 
 let current: GlobalModalContainer;
-let modalInstances: React.Component[] = [];
+  
+let modalInstances: (React.Component & IHandleKeyboard)[] = [];
 
 export class GlobalModalContainer extends React.Component<{}, GlobalModalContainerState> {
   constructor(props: {}) {
@@ -22,6 +29,25 @@ export class GlobalModalContainer extends React.Component<{}, GlobalModalContain
     current = this;
   }
 
+  componentDidMount() {
+    window.addEventListener("keydown", this.hanldleKeyDown);
+  }
+
+  componentWillUnmount() {
+    window.removeEventListener("keydown", this.hanldleKeyDown);
+  }
+
+  hanldleKeyDown = (e: KeyboardEvent) => {
+    if (modalInstances.length) {
+      e.preventDefault();
+      var topMost = modalInstances[modalInstances.length - 1];
+
+      if (topMost.handleKeyDown) {
+        topMost.handleKeyDown(e);
+      }
+    }
+  }
+
   componentWillReceiveProps(nextProps: {}, nextContext: any): void {
     var newUrl = Navigator.history.location.pathname;
 
@@ -44,7 +70,8 @@ export function openModal<T>(modal: React.ReactElement<IModalProps>): Promise<T
       resolve(val);
     }
 
-    cloned = React.cloneElement(modal, { onExited: onExited, key: current.state.modals.length } as any);
+    cloned = FunctionalAdapter.withRef(React.cloneElement(modal, { onExited: onExited, key: current.state.modals.length } as any),
+      c => c ? modalInstances.push(c) : modalInstances.pop());
 
     current.state.modals.push(cloned);
     current.forceUpdate();
diff --git a/Signum.React/Scripts/SelectorModal.tsx b/Signum.React/Scripts/SelectorModal.tsx
index 11f9d1f1e3..13ccd75912 100644
--- a/Signum.React/Scripts/SelectorModal.tsx
+++ b/Signum.React/Scripts/SelectorModal.tsx
@@ -1,4 +1,3 @@
-
 import * as React from 'react'
 import { openModal, IModalProps } from './Modals';
 import { SelectorMessage } from './Signum.Entities'

From cf7f4e63ee774cb379d8e6acca6baccaf19f6660 Mon Sep 17 00:00:00 2001
From: Olmo del Corral <olmo@signumsoftware.com>
Date: Fri, 15 Mar 2019 09:05:01 +0100
Subject: [PATCH 25/25] fix openedModals

---
 Signum.React/Scripts/Frames/FrameModal.tsx | 2 +-
 Signum.React/Scripts/Frames/FramePage.tsx  | 4 ++--
 Signum.React/Scripts/Modals.tsx            | 8 +++++++-
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/Signum.React/Scripts/Frames/FrameModal.tsx b/Signum.React/Scripts/Frames/FrameModal.tsx
index 68a4f0583e..cc324108d7 100644
--- a/Signum.React/Scripts/Frames/FrameModal.tsx
+++ b/Signum.React/Scripts/Frames/FrameModal.tsx
@@ -277,7 +277,7 @@ export default class FrameModal extends React.Component<FrameModalProps, FrameMo
     return (
       <div className="modal-body">
         {renderWidgets({ ctx: ctx, pack: pack })}
-        {this.entityComponent && <ButtonBar frame={frame} pack={pack} isOperationVisible={this.props.isOperationVisible} />}
+        {this.entityComponent && <ButtonBar ref={bb => this.buttonBar = bb} frame={frame} pack={pack} isOperationVisible={this.props.isOperationVisible} />}
         <ValidationErrors entity={pack.entity} ref={ve => this.validationErrors = ve} prefix={this.prefix} />
         {embeddedWidgets.top}
         <div className="sf-main-control" data-test-ticks={new Date().valueOf()} data-main-entity={entityInfo(ctx.value)}>
diff --git a/Signum.React/Scripts/Frames/FramePage.tsx b/Signum.React/Scripts/Frames/FramePage.tsx
index 83e7f29915..0eab05d6b0 100644
--- a/Signum.React/Scripts/Frames/FramePage.tsx
+++ b/Signum.React/Scripts/Frames/FramePage.tsx
@@ -67,8 +67,8 @@ export default class FramePage extends React.Component<FramePageProps, FramePage
   }
 
   hanldleKeyDown = (e: KeyboardEvent) => {
-    if (!e.defaultPrevented)
-      this.buttonBar && this.buttonBar.hanldleKeyDown(e);
+    if (!e.openedModals && this.buttonBar)
+      this.buttonBar.hanldleKeyDown(e);
   }
 
   load(props: FramePageProps) {
diff --git a/Signum.React/Scripts/Modals.tsx b/Signum.React/Scripts/Modals.tsx
index 3bf481fa48..d2716d865f 100644
--- a/Signum.React/Scripts/Modals.tsx
+++ b/Signum.React/Scripts/Modals.tsx
@@ -4,6 +4,12 @@ import * as React from 'react'
 import { FunctionalAdapter } from './Frames/FrameModal';
 import { Modal } from 'react-overlays';
 
+declare global {
+  interface KeyboardEvent {
+    openedModals?: boolean;
+  }
+}
+
 export interface IModalProps {
   onExited?: (val: any) => void;
 }
@@ -39,7 +45,7 @@ export class GlobalModalContainer extends React.Component<{}, GlobalModalContain
 
   hanldleKeyDown = (e: KeyboardEvent) => {
     if (modalInstances.length) {
-      e.preventDefault();
+      e.openedModals = true;
       var topMost = modalInstances[modalInstances.length - 1];
 
       if (topMost.handleKeyDown) {