.NET 4.5: JSON serializer ignore __type property

ToJson.cs

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.Text;

public class ToJsonSample {
	public string ToJson(Type type, object value) {
		if (value == null) {
			return null;
		}
		using (MemoryStream stream = new MemoryStream())
		using (StreamReader reader = new StreamReader(stream, Encoding.UTF8)) {
			var settings = new DataContractJsonSerializerSettings();
			settings.EmitTypeInformation = EmitTypeInformation.Never;
			var serializer = new DataContractJsonSerializer(type, settings);
			serializer.WriteObject(stream, value);
			stream.Position = 0;
			return reader.ReadToEnd();
		}
	}

	public string ToJson<T>(T value) where T : class {
		if (value == null) {
			return null;
		}
		using (MemoryStream stream = new MemoryStream())
		using (StreamReader reader = new StreamReader(stream, Encoding.UTF8)) {
			var settings = new DataContractJsonSerializerSettings();
			settings.EmitTypeInformation = EmitTypeInformation.Never;
			var serializer = new DataContractJsonSerializer(typeof(T), settings);
			serializer.WriteObject(stream, value);
			stream.Position = 0;
			return reader.ReadToEnd();
		}
	}
}