增加ObjectExtensions的扩展函数

tests/Riven.Tests/Extensions/ObjectExtensions_Test.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+
+namespace Riven.Extensions
+{
+    public class ObjectExtensions_Test
+    {
+        [Fact]
+        public void As()
+        {
+            object obj = new SampleObject()
+            {
+                Txt = string.Empty
+            };
+
+            var sampleObject = obj.As<SampleObject>();
+
+            Assert.Equal(obj, sampleObject);
+        }
+
+        [Fact]
+        public void To()
+        {
+            Assert.Equal(SampleEnum.Default, 0.To<SampleEnum>());
+            Assert.Equal(SampleEnum.Open, 1.To<SampleEnum>());
+            Assert.Equal(SampleEnum.Closed, 2.To<SampleEnum>());
+
+
+            Assert.Throws<ArgumentException>(() =>
+            {
+                20.To<SampleEnum>();
+            });
+        }
+    }
+
+    public class SampleObject
+    {
+        public string Txt { get; set; }
+    }
+
+    public enum SampleEnum
+    {
+        Default = 0,
+        Open = 1,
+        Closed = 2
+    }
+
+}