using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

// https://stackoverflow.com/questions/45547123/how-to-call-jsonconvert-deserializeobject-with-the-standard-jsonconverter

​

    [JsonConverter(typeof(JsonProductConverted))]

    public abstract class Product

    {

    }

​

    public class ProductImpl : Product

    {

        public int Foo { get; set; }

    }

​

    public class JsonProductConverted : JsonTypeInferringConverterBase

    {

        protected override Type InferType(Type objectType, JObject json)

        {

            //var type = GetTypeFromId((int) json["typeId"]); // Construct type from field in 

            return typeof(ProductImpl);

        }

        public override bool CanConvert(Type objectType)

        {

            return false;

        }

    }

​

    public abstract class JsonTypeInferringConverterBase : JsonConverter

    {

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

​

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

        {

            throw new NotImplementedException();

        }

​

        protected abstract Type InferType(Type objectType, JObject json);

​

        protected virtual object CreateObject(Type actualType, JsonSerializer serializer, JObject json)

        {

            var contract = (JsonObjectContract)serializer.ContractResolver.ResolveContract(actualType);

            return contract.DefaultCreator();

        }

​

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

        {

            if (reader.TokenType == JsonToken.Null)

                return null;

            var json = JObject.Load(reader);

​

            var actualType = InferType(objectType, json);

​

            // Construct object (or reuse existingValue if compatible)

            if (existingValue == null || !actualType.IsAssignableFrom(existingValue.GetType()))

            {

                existingValue = CreateObject(actualType, serializer, json);

            }

​

            // Populate object.

            using (var subReader = json.CreateReader())

            {

                serializer.Populate(subReader, existingValue);

            }

​

            return existingValue;

        }

    }

    class TestClass

    {

        public static void Test()

        {

            var prod = new ProductImpl { Foo = 101 };

            var json = JsonConvert.SerializeObject(prod);

            Console.WriteLine(json);

            var prod2 = JsonConvert.DeserializeObject<Product>(json);

            var json2 = JsonConvert.SerializeObject(prod2);

            Console.WriteLine("Deserialized product type: {0}", prod2.GetType());

            Console.WriteLine("Deserialied and re-serialized JSON: {0}", json2);

            Assert.IsTrue(prod2.GetType() == prod.GetType());

            Assert.IsTrue(json2 == json);

        }

    }

​

    public class AssertionFailedException : System.Exception

    {

        public AssertionFailedException() : base() { }

​

        public AssertionFailedException(string s) : base(s) { }

    }

​

    public static class Assert

    {

        public static void IsTrue(bool value)

        {

            IsTrue(value, "failed");

        }

​

        public static void IsTrue(bool value, string message)

        {

            if (value == false)

                throw new AssertionFailedException(message ?? "failed");

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: " + Environment.Version);

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

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​