-Added support for deserializing to JToken

-Improved circular reference error message with type name

Src/Newtonsoft.Json.Tests/Serialization/JsonSerializerTest.cs

@@ -1322,7 +1322,7 @@ keyword such as type of business.""
     }
 
     [Test]
-    [ExpectedException(typeof(JsonSerializationException), ExpectedMessage = @"Self referencing loop")]
+    [ExpectedException(typeof(JsonSerializationException))]
     public void JsonPropertyWithHandlingValues_ReferenceLoopError()
     {
       JsonPropertyWithHandlingValues o = new JsonPropertyWithHandlingValues();
@@ -3959,5 +3959,28 @@ keyword such as type of business.""
         });
     }
 #endif
+
+    public class Response
+    {
+      public string Name { get; set; }
+      public JToken Data { get; set; }
+    }
+
+    [Test]
+    public void DeserializeJToken()
+    {
+      Response response = new Response
+        {
+          Name = "Success",
+          Data = new JObject(new JProperty("First", "Value1"), new JProperty("Second", "Value2"))
+        };
+
+      string json = JsonConvert.SerializeObject(response, Formatting.Indented);
+
+      Response deserializedResponse = JsonConvert.DeserializeObject<Response>(json);
+
+      Assert.AreEqual("Success", deserializedResponse.Name);
+      Assert.IsTrue(deserializedResponse.Data.DeepEquals(response.Data));
+    }
   }
 }

Src/Newtonsoft.Json.Tests/Serialization/PreserveReferencesHandlingTests.cs

@@ -87,7 +87,7 @@ namespace Newtonsoft.Json.Tests.Serialization
     }
 
     [Test]
-    [ExpectedException(typeof(JsonSerializationException), ExpectedMessage = "Self referencing loop")]
+    [ExpectedException(typeof(JsonSerializationException))]
     public void SerializeCircularListsError()
     {
       CircularList circularList = new CircularList();
@@ -239,7 +239,7 @@ namespace Newtonsoft.Json.Tests.Serialization
     }
 
     [Test]
-    [ExpectedException(typeof(JsonSerializationException), ExpectedMessage = "Self referencing loop")]
+    [ExpectedException(typeof(JsonSerializationException))]
     public void SerializeCircularDictionarysError()
     {
       CircularDictionary circularDictionary = new CircularDictionary();

Src/Newtonsoft.Json/Serialization/DefaultContractResolver.cs

@@ -498,7 +498,7 @@ namespace Newtonsoft.Json.Serialization
       if (JsonTypeReflector.GetJsonArrayAttribute(t) != null)
         return CreateArrayContract(t);
 
-      if (t.IsSubclassOf(typeof(JToken)))
+      if (t == typeof(JToken) || t.IsSubclassOf(typeof(JToken)))
         return CreateLinqContract(t);
 
       if (CollectionUtils.IsDictionaryType(t))

Src/Newtonsoft.Json/Serialization/JsonSerializerInternalWriter.cs

@@ -214,7 +214,7 @@ namespace Newtonsoft.Json.Serialization
         switch (referenceLoopHandling.GetValueOrDefault(Serializer.ReferenceLoopHandling))
         {
           case ReferenceLoopHandling.Error:
-            throw new JsonSerializationException("Self referencing loop");
+            throw new JsonSerializationException("Self referencing loop detected for type '{0}'.".FormatWith(CultureInfo.InvariantCulture, value.GetType()));
           case ReferenceLoopHandling.Ignore:
             return false;
           case ReferenceLoopHandling.Serialize: