using System;

using Newtonsoft.Json;

​

public class Program

{

    public static void Main()

    {

        var serSettings = new JsonSerializerSettings

        {

            TypeNameHandling = TypeNameHandling.All

        };

        var dto = Tuple.Create(1,2);

        var dtoSerialized = JsonConvert.SerializeObject(dto, serSettings);

        Console.WriteLine(dtoSerialized);

        var dtoObjDeserialized = JsonConvert.DeserializeObject(dtoSerialized, serSettings);

        Console.Write(dtoObjDeserialized.GetType().Name);

    }

}