using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

using System.Threading;

using System.Collections.ObjectModel;

using System.Reflection;

using System.ComponentModel;

using System.Globalization;

using System.Collections.Specialized;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;

​

    [JsonConverter(typeof(TestConverter))]

    public class DataType

    {

        public string Value { get; set; }

    }

​

    public class TestConverter : JsonConverter

    {

        public static readonly DataType someSpecialDataTypeInstance = new DataType { Value = "SingleTon" };

​

        public override bool CanConvert(Type objectType)

        {

            throw new NotImplementedException();

        }

​

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

        {

            if (reader.Value != null && reader.ValueType == typeof(string))

            {

                return someSpecialDataTypeInstance;

            }

            else if (reader.TokenType == JsonToken.StartObject)

            {

                existingValue = existingValue ?? serializer.ContractResolver.ResolveContract(objectType).DefaultCreator();

                serializer.Populate(reader, existingValue);

                return existingValue;

            }

            else if (reader.TokenType == JsonToken.Null)

            {

                return null;

            }

            else

            {

                throw new JsonSerializationException();

            }

        }

​

        public override bool CanWrite { get { return false; } }

​

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

        {

            throw new NotImplementedException();

        }

    }

​

    public class TestClass

    {

        public DataType DataType { get; set; }

​

        public string ZZValue { get; set; }

​

        public static void Test()

        {

            var test = new TestClass { DataType = new DataType { Value = "Foo Bar" }, ZZValue = "value that comes after the DataType and must be successfully deserialized." };

            var json = JsonConvert.SerializeObject(test, Formatting.Indented);

            Console.WriteLine("JSON with object value for DataType: ");

            Console.WriteLine(json);

            var test2 = JsonConvert.DeserializeObject<TestClass>(json);

            if (test2.DataType.Value != test.DataType.Value)

            {

                throw new InvalidOperationException();

            }

​

            if (test2.ZZValue != test.ZZValue)

            {

                throw new InvalidOperationException();

            }

            Console.WriteLine("JSON was successfully deserialized.");

​

            var token = JToken.Parse(json);

            token["DataType"] = (JValue)"hello";

            var json3 = token.ToString();

​

            Console.WriteLine("JSON with string value for DataType: ");

            Console.WriteLine(json3);

            var test3 = JsonConvert.DeserializeObject<TestClass>(json3);

​

            if (test3.DataType != TestConverter.someSpecialDataTypeInstance)

            {

                throw new InvalidOperationException();

            }

​

            if (test3.ZZValue != test.ZZValue)

            {

                throw new InvalidOperationException();

            }

            Console.WriteLine("JSON was successfully deserialized.");

        }

    }

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Json.NET version: " + typeof(JsonSerializer).Assembly.FullName + "\n");

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Test of TestConverter failed.  Exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }