Move the working BinaryFormatter implementation to a NuGet package

src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs

@@ -135,7 +135,9 @@ public static int SlowRuntimeTimeoutModifier
         public static bool IsThreadingSupported => (!IsWasi && !IsBrowser) || IsWasmThreadingSupported;
         public static bool IsWasmThreadingSupported => IsBrowser && IsEnvironmentVariableTrue("IsBrowserThreadingSupported");
         public static bool IsNotWasmThreadingSupported => !IsWasmThreadingSupported;
-        public static bool IsBinaryFormatterSupported => IsNotMobile && !IsNativeAot;
+
+        private static readonly Lazy<bool> s_isBinaryFormatterSupported = new Lazy<bool>(DetermineBinaryFormatterSupport);
+        public static bool IsBinaryFormatterSupported => s_isBinaryFormatterSupported.Value;
 
         public static bool IsStartingProcessesSupported => !IsiOS && !IstvOS;
 
@@ -721,5 +723,37 @@ private static bool GetSupportsSha3()
 
             return false;
         }
+
+        private static bool DetermineBinaryFormatterSupport()
+        {
+            Assembly assembly = typeof(System.Runtime.Serialization.Formatters.Binary.BinaryFormatter).Assembly;
+            AssemblyName name = assembly.GetName();
+            Version assemblyVersion = name.Version;
+
+            if (IsNetFramework)
+            {
+                return true;
+            }
+
+            if (IsNativeAot)
+            {
+                Console.WriteLine("BinaryFormatter is disabled in NativeAOT");
+                return false;
+            }
+
+            bool isSupported = true;
+
+            // Version 8.1 is the version in the shared runtime (.NET 9+) that has the type disabled with no config.
+            // Assembly versions beyond 8.1 are the fully functional version from NuGet.
+            // Assembly versions before 8.1 probably won't be encountered, since that's the past.
+
+            if (assemblyVersion.Major == 8 && assemblyVersion.Minor == 1)
+            {
+                isSupported = false;
+            }
+
+            Console.WriteLine($"BinaryFormatter is from assembly version {assemblyVersion}, supported={isSupported}");
+            return isSupported;
+        }
     }
 }

src/libraries/System.Runtime.Serialization.Formatters/Directory.Build.targets

@@ -0,0 +1,14 @@
+<Project>
+  <Import Project="..\Directory.Build.targets" />
+  <PropertyGroup>
+
+    <!--
+      The real implementation of this library is built for NetCoreAppMinimum,
+      the NetCoreAppCurrent build has a non-functional copy of BinaryFormatter.
+      The NetCoreAppCurrent build is only included in the shared runtime,
+      and should always lose to the package for unification; so it is pinned
+      at an assembly version that will always lose.
+    -->
+    <AssemblyVersion Condition="'$(TargetFramework)' == '$(NetCoreAppCurrent)'">8.1.0.0</AssemblyVersion>
+  </PropertyGroup>
+</Project>

src/libraries/System.Runtime.Serialization.Formatters/ref/System.Runtime.Serialization.Formatters.csproj

@@ -1,12 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
+    <TargetFrameworks>$(NetCoreAppMinimum);$(NetCoreAppCurrent)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="System.Runtime.Serialization.Formatters.cs" />
     <Compile Include="System.Runtime.Serialization.Formatters.Forwards.cs" />
   </ItemGroup>
-  <ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' == '$(NetCoreAppCurrent)'">
     <ProjectReference Include="..\..\System.Collections.NonGeneric\ref\System.Collections.NonGeneric.csproj" />
     <ProjectReference Include="..\..\System.Runtime\ref\System.Runtime.csproj" />
   </ItemGroup>

src/libraries/System.Runtime.Serialization.Formatters/src/PACKAGE.md

@@ -0,0 +1,17 @@
+## About
+
+Provides the legacy BinaryFormatter class for workloads which still require it.
+
+## Main Types
+
+The main types provided by this library are:
+
+* `System.Runtime.Serialization.Formatters.Binary.BinaryFormatter`
+
+## Additional Documentation
+
+* [Obsoletion Notice](https://aka.ms/binaryformatter)
+
+## Feedback & Contributing
+
+System.Runtime.Serialization.Formatters is released as open source under the [MIT license](https://licenses.nuget.org/MIT). Bug reports are welcome at [the GitHub repository](https://github.com/dotnet/runtime). This package is considered legacy, and we only consider low-risk, high-impact fixes that are necessary to maintain functionality.

src/libraries/System.Runtime.Serialization.Formatters/src/Resources/Strings.resx

@@ -252,4 +252,7 @@
   <data name="BinaryFormatter_SerializationNotSupportedOnThisPlatform" xml:space="preserve">
     <value>BinaryFormatter serialization and deserialization are not supported on this platform. See https://aka.ms/binaryformatter for more information.</value>
   </data>
+  <data name="BinaryFormatter_Removed" xml:space="preserve">
+    <value>BinaryFormatter serialization and deserialization have been removed. See https://aka.ms/binaryformatter for more information.</value>
+  </data>
 </root>

src/libraries/System.Runtime.Serialization.Formatters/src/System.Runtime.Serialization.Formatters.csproj

@@ -1,20 +1,24 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppCurrent)-browser;$(NetCoreAppCurrent)-ios;$(NetCoreAppCurrent)-tvos;$(NetCoreAppCurrent)-android</TargetFrameworks>
+    <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppMinimum)</TargetFrameworks>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
+    <IsPackable>true</IsPackable>
+    <!-- TODO: Enable validation after the .NET 9 package release -->
+    <EnablePackageValidation>false</EnablePackageValidation>
   </PropertyGroup>
 
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>
-    <TargetPlatformIdentifier Condition="$(TargetFramework.Contains('-'))">$(TargetFramework.SubString($([MSBuild]::Add($(TargetFramework.IndexOf('-')), 1))))</TargetPlatformIdentifier>
-    <!-- TargetsMobile: When we replace implementations with PNSE, need to suppress some "field is never assigned to" warnings. -->
-    <NoWarn Condition="'$(TargetPlatformIdentifier)' != ''">$(NoWarn);CS0649</NoWarn>
     <NoWarn>$(NoWarn);CA1822;IDE0060</NoWarn>
+
+    <FunctioningBinaryFormatter Condition="'$(TargetFramework)' == '$(NetCoreAppMinimum)'">true</FunctioningBinaryFormatter>
+    <IncludeBuildOutput Condition="'$(FunctioningBinaryFormatter)' != 'true'">false</IncludeBuildOutput>
+    <SuppressDependenciesWhenPacking Condition="'$(FunctioningBinaryFormatter)' != 'true'">true</SuppressDependenciesWhenPacking>
   </PropertyGroup>
 
-  <ItemGroup>
-    <ILLinkSubstitutionsXmls Condition="'$(TargetPlatformIdentifier)' == ''" Include="$(ILLinkDirectory)ILLink.Substitutions.NonMobile.xml" />
+  <ItemGroup Condition="'$(FunctioningBinaryFormatter)' == 'true'">
+    <ILLinkSubstitutionsXmls Include="$(ILLinkDirectory)ILLink.Substitutions.xml" />
   </ItemGroup>
 
   <ItemGroup>
@@ -37,55 +41,55 @@
     <Compile Include="System\Runtime\Serialization\ValueTypeFixupInfo.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\CommonEnums.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\IFieldInfo.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryFormatter.cs" />
+    <Compile Include="$(CommonPath)System\Obsoletions.cs"
+             Link="Common\System\Obsoletions.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Collections\HashHelpers.cs"
+             Link="Common\System\Collections\HashHelpers.cs" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(FunctioningBinaryFormatter)' == 'true'">
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryArray.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryAssembly.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryAssemblyInfo.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryTypeConverter.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryCrossAppDomainAssembly.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryCrossAppDomainMap.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryCrossAppDomainString.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryEnums.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryFormatter.Core.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryFormatterEventSource.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryFormatterWriter.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryObject.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryObjectInfo.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryObjectReader.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryObjectString.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryObjectWithMap.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryObjectWithMapTyped.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryObjectWriter.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryParser.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryTypeConverter.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryUtilClasses.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\Converter.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\IStreamable.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\MemberPrimitiveTyped.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\MemberPrimitiveUntyped.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\MemberReference.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\MessageEnd.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\ObjectMap.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\ObjectNull.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\SerializationHeaderRecord.cs" />
     <Compile Include="System\Runtime\Serialization\Formatters\Binary\ObjectProgress.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\Converter.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryEnums.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryFormatter.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryFormatterEventSource.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryFormatterWriter.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryObjectInfo.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryObjectReader.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryObjectWriter.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryParser.cs" />
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryUtilClasses.cs" />
-    <Compile Include="$(CommonPath)System\Obsoletions.cs"
-             Link="Common\System\Obsoletions.cs" />
-    <Compile Include="$(CoreLibSharedDir)System\Collections\HashHelpers.cs"
-             Link="Common\System\Collections\HashHelpers.cs" />
-  </ItemGroup>
-
-  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == ''">
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryFormatter.Core.cs" />
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\SerializationHeaderRecord.cs" />
     <Compile Include="System\Runtime\Serialization\LocalAppContextSwitches.cs" />
     <Compile Include="$(CommonPath)System\LocalAppContextSwitches.Common.cs">
       <Link>Common\System\LocalAppContextSwitches.Common.cs</Link>
     </Compile>
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetPlatformIdentifier)' != ''">
-    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryFormatter.PlatformNotSupported.cs" />
+  <ItemGroup Condition="'$(FunctioningBinaryFormatter)' != 'true'">
+    <Compile Include="System\Runtime\Serialization\Formatters\Binary\BinaryFormatter.Removed.cs" />
   </ItemGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' == '$(NetCoreAppCurrent)'">
     <ProjectReference Include="$(CoreLibProject)" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Collections\src\System.Collections.csproj" />

src/libraries/System.Runtime.Serialization.Formatters/src/System/Runtime/Serialization/Formatters/Binary/BinaryFormatter.Core.cs

@@ -1,13 +1,18 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Collections.Concurrent;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
 
 namespace System.Runtime.Serialization.Formatters.Binary
 {
     public sealed partial class BinaryFormatter : IFormatter
     {
+        private static readonly ConcurrentDictionary<Type, TypeInformation> s_typeNameCache = new ConcurrentDictionary<Type, TypeInformation>();
+
+        internal object[]? _crossAppDomainArray;
+
         [RequiresDynamicCode(IFormatter.RequiresDynamicCodeMessage)]
         [RequiresUnreferencedCode(IFormatter.RequiresUnreferencedCodeMessage)]
         public object Deserialize(Stream serializationStream)
@@ -88,5 +93,12 @@ public void Serialize(Stream serializationStream, object graph)
                 BinaryFormatterEventSource.Log.SerializationStop();
             }
         }
+
+        internal static TypeInformation GetTypeInformation(Type type) =>
+            s_typeNameCache.GetOrAdd(type, t =>
+            {
+                string assemblyName = FormatterServices.GetClrAssemblyName(t, out bool hasTypeForwardedFrom);
+                return new TypeInformation(FormatterServices.GetClrTypeFullName(t), assemblyName, hasTypeForwardedFrom);
+            });
     }
 }

src/libraries/System.Runtime.Serialization.Formatters/src/System/Runtime/Serialization/Formatters/Binary/BinaryFormatter.PlatformNotSupported.cs → src/libraries/System.Runtime.Serialization.Formatters/src/System/Runtime/Serialization/Formatters/Binary/BinaryFormatter.Removed.cs

@@ -11,10 +11,10 @@ public sealed partial class BinaryFormatter : IFormatter
         [RequiresDynamicCode(IFormatter.RequiresDynamicCodeMessage)]
         [RequiresUnreferencedCode(IFormatter.RequiresUnreferencedCodeMessage)]
         public object Deserialize(Stream serializationStream)
-            => throw new PlatformNotSupportedException(SR.BinaryFormatter_SerializationNotSupportedOnThisPlatform);
+            => throw new PlatformNotSupportedException(SR.BinaryFormatter_Removed);
 
         [RequiresUnreferencedCode(IFormatter.RequiresUnreferencedCodeMessage)]
         public void Serialize(Stream serializationStream, object graph)
-            => throw new PlatformNotSupportedException(SR.BinaryFormatter_SerializationNotSupportedOnThisPlatform);
+            => throw new PlatformNotSupportedException(SR.BinaryFormatter_Removed);
     }
 }

src/libraries/System.Runtime.Serialization.Formatters/src/System/Runtime/Serialization/Formatters/Binary/BinaryFormatter.cs

@@ -1,22 +1,17 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using System.Collections.Concurrent;
-
 namespace System.Runtime.Serialization.Formatters.Binary
 {
     [Obsolete(Obsoletions.BinaryFormatterMessage, DiagnosticId = Obsoletions.BinaryFormatterDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
     public sealed partial class BinaryFormatter : IFormatter
     {
-        private static readonly ConcurrentDictionary<Type, TypeInformation> s_typeNameCache = new ConcurrentDictionary<Type, TypeInformation>();
-
         internal ISurrogateSelector? _surrogates;
         internal StreamingContext _context;
         internal SerializationBinder? _binder;
         internal FormatterTypeStyle _typeFormat = FormatterTypeStyle.TypesAlways; // For version resiliency, always put out types
         internal FormatterAssemblyStyle _assemblyFormat = FormatterAssemblyStyle.Simple;
         internal TypeFilterLevel _securityLevel = TypeFilterLevel.Full;
-        internal object[]? _crossAppDomainArray;
 
         public FormatterTypeStyle TypeFormat { get { return _typeFormat; } set { _typeFormat = value; } }
         public FormatterAssemblyStyle AssemblyFormat { get { return _assemblyFormat; } set { _assemblyFormat = value; } }
@@ -34,12 +29,5 @@ public BinaryFormatter(ISurrogateSelector? selector, StreamingContext context)
             _surrogates = selector;
             _context = context;
         }
-
-        internal static TypeInformation GetTypeInformation(Type type) =>
-            s_typeNameCache.GetOrAdd(type, t =>
-            {
-                string assemblyName = FormatterServices.GetClrAssemblyName(t, out bool hasTypeForwardedFrom);
-                return new TypeInformation(FormatterServices.GetClrTypeFullName(t), assemblyName, hasTypeForwardedFrom);
-            });
     }
 }

src/libraries/System.Runtime.Serialization.Formatters/src/System/Runtime/Serialization/Formatters/Binary/BinaryObjectReader.cs

@@ -75,6 +75,21 @@ internal ObjectReader(Stream stream, ISurrogateSelector? selector, StreamingCont
             _formatterEnums = formatterEnums;
         }
 
+        private static IDisposable? StartDeserialization()
+        {
+            MethodInfo? targetMethod = typeof(SerializationInfo).GetMethod(
+                "StartDeserialization",
+                BindingFlags.Public | BindingFlags.Static,
+                Type.EmptyTypes);
+
+            if (targetMethod is null)
+            {
+                throw new InvalidOperationException();
+            }
+
+            return (IDisposable?)targetMethod.Invoke(null, null);
+        }
+
         [RequiresDynamicCode(ObjectReaderUnreferencedCodeMessage)]
         [RequiresUnreferencedCode("Types might be removed")]
         internal object Deserialize(BinaryParser serParser)
@@ -87,7 +102,7 @@ internal object Deserialize(BinaryParser serParser)
 
             _isSimpleAssembly = (_formatterEnums._assemblyFormat == FormatterAssemblyStyle.Simple);
 
-            using (DeserializationToken token = SerializationInfo.StartDeserialization())
+            using (StartDeserialization())
             {
                 if (_fullDeserialization)
                 {

src/libraries/System.Runtime.Serialization.Formatters/tests/BinaryFormatterEventSourceTests.cs

@@ -11,7 +11,7 @@
 
 namespace System.Runtime.Serialization.Formatters.Tests
 {
-    [ConditionalClass(typeof(PlatformDetection), nameof(PlatformDetection.IsBinaryFormatterSupported))]
+    [ConditionalClass(typeof(TestConfiguration), nameof(TestConfiguration.IsBinaryFormatterEnabled))]
     public static class BinaryFormatterEventSourceTests
     {
         private const string BinaryFormatterEventSourceName = "System.Runtime.Serialization.Formatters.Binary.BinaryFormatterEventSource";

src/libraries/System.Runtime.Serialization.Formatters/tests/BinaryFormatterTests.cs

@@ -18,7 +18,7 @@
 
 namespace System.Runtime.Serialization.Formatters.Tests
 {
-    [ConditionalClass(typeof(PlatformDetection), nameof(PlatformDetection.IsBinaryFormatterSupported))]
+    [ConditionalClass(typeof(TestConfiguration), nameof(TestConfiguration.IsBinaryFormatterEnabled))]
     public partial class BinaryFormatterTests : FileCleanupTestBase
     {
         // On 32-bit we can't test these high inputs as they cause OutOfMemoryExceptions.