Fix DCJS serialiation for type which has DataMember with special Name values

Author: khdang

src/System.Private.DataContractSerialization/src/System/Runtime/Serialization/Json/XmlObjectSerializerWriteContextComplexJson.cs

@@ -326,6 +326,12 @@ private void VerifyType(DataContract dataContract, Type declaredType)
                 scopedKnownTypes.Pop();
             }
         }
+
+        internal static void WriteJsonNameWithMapping(XmlWriterDelegator xmlWriter, XmlDictionaryString[] memberNames, int index)
+        {
+            xmlWriter.WriteStartElement("a", JsonGlobals.itemString, JsonGlobals.itemString);
+            xmlWriter.WriteAttributeString(null, JsonGlobals.itemString, null, memberNames[index].Value);
+        }
 #endif
 
         internal static void VerifyObjectCompatibilityWithInterface(DataContract contract, object graph, Type declaredType)

src/System.Runtime.Serialization.Json/tests/DataContractJsonSerializer.cs

@@ -1296,6 +1296,19 @@ public static void DCJS_UseSimpleDictionaryFormat()
         Assert.StrictEqual(dict["key2"], deserialized["key2"]);
     }
 
+    [Fact]
+    public static void DCJS_DataMemberNames()
+    {
+        var obj = new AppEnvironment()
+        {
+            ScreenDpi = 440,
+            ScreenOrientation = "horizontal"
+        };
+        var actual = SerializeAndDeserialize(obj, @"{""screen_dpi(x:y)"":440,""screen:orientation"":""horizontal""}");
+        Assert.StrictEqual(obj.ScreenDpi, actual.ScreenDpi);
+        Assert.StrictEqual(obj.ScreenOrientation, actual.ScreenOrientation);
+    }
+
     private static T SerializeAndDeserialize<T>(T value, string baseline, DataContractJsonSerializerSettings settings = null, Func<DataContractJsonSerializer> serializerFactory = null)
     {
         DataContractJsonSerializer dcjs;

src/System.Runtime.Serialization.Xml/tests/SerializationTypes.cs

@@ -2119,3 +2119,13 @@ public TypeWithNonParameterlessConstructor(string value)
         StringProperty = value;
     }
 }
+
+[DataContract]
+public class AppEnvironment
+{
+    [DataMember(Name = "screen:orientation")]
+    public string ScreenOrientation { get; set; }
+
+    [DataMember(Name = "screen_dpi(x:y)")]
+    public int ScreenDpi { get; set; }
+}