-Fixed writing ULong.MaxValue JValues as JSON

Src/Newtonsoft.Json.Tests/Linq/LinqToJsonTest.cs

@@ -54,6 +54,38 @@ namespace Newtonsoft.Json.Tests.Linq
     [TestFixture]
     public class LinqToJsonTest : TestFixtureBase
     {
+        public class TestClass_ULong
+        {
+            public ulong Value { get; set; }
+        }
+
+        [Test]
+        public void FromObject_ULongMaxValue()
+        {
+            TestClass_ULong instance = new TestClass_ULong { Value = ulong.MaxValue };
+            JObject output = JObject.FromObject(instance);
+
+            StringAssert.AreEqual(@"{
+  ""Value"": 18446744073709551615
+}", output.ToString());
+        }
+
+        public class TestClass_Byte
+        {
+            public byte Value { get; set; }
+        }
+
+        [Test]
+        public void FromObject_ByteMaxValue()
+        {
+            TestClass_Byte instance = new TestClass_Byte { Value = byte.MaxValue };
+            JObject output = JObject.FromObject(instance);
+
+            StringAssert.AreEqual(@"{
+  ""Value"": 255
+}", output.ToString());
+        }
+
         [Test]
         public void ToObject_Base64AndGuid()
         {

Src/Newtonsoft.Json/Linq/JValue.cs

@@ -676,11 +676,17 @@ namespace Newtonsoft.Json.Linq
                     writer.WriteUndefined();
                     return;
                 case JTokenType.Integer:
+                    if (_value is int)
+                        writer.WriteValue((int)_value);
+                    else if (_value is long)
+                        writer.WriteValue((long)_value);
+                    else if (_value is ulong)
+                        writer.WriteValue((ulong)_value);
 #if !(NET20 || NET35 || PORTABLE40 || PORTABLE)
-                    if (_value is BigInteger)
+                    else if (_value is BigInteger)
                         writer.WriteValue((BigInteger)_value);
-                    else
 #endif
+                    else
                         writer.WriteValue(Convert.ToInt64(_value, CultureInfo.InvariantCulture));
                     return;
                 case JTokenType.Float: