Serializes to JSON preserving type information

Output.txt

{
  "Id": "b9c9e21a-caa4-4ed9-9282-27a54ad63ac0",
  "Body": {
    "$type": "ScheduleJobCommand",
    "JobName": "name",
    "Url": "url"
  }
}
{
  "Id": "36f4716c-21ee-4854-8313-25adfdd03545",
  "Body": {
    "$type": "CreateUserCommand",
    "CreatedOn": "2012-12-06T00:10:27.6440139Z",
    "LoginInfo": {
      "UserName": "username",
      "Password": "password"
    }
  }
}
36f4716c-21ee-4854-8313-25adfdd03545
username

Program.cs

using System;
using System.Runtime.Serialization;
using Newtonsoft.Json;

namespace JsonType1
{
    public class TypeNameSerializationBinder : SerializationBinder
    {
        public string TypeFormat { get; private set; }

        public TypeNameSerializationBinder(string typeFormat)
        {
            TypeFormat = typeFormat;
        }

        public override void BindToName(Type serializedType, out string assemblyName, out string typeName)
        {
            assemblyName = null;
            typeName = serializedType.Name;
        }

        public override Type BindToType(string assemblyName, string typeName)
        {
            string resolvedTypeName = string.Format(TypeFormat, typeName);

            return Type.GetType(resolvedTypeName, true);
        }
    }

    internal class ScheduleJobCommand
    {
        public string JobName { get; set; }
        public string Url { get; set; }
    }

    internal class LoginInfo
    {
        public string UserName { get; set; }
        public string Password { get; set; }
    }

    internal class CreateUserCommand
    {
        public DateTime CreatedOn { get; set; }
        public LoginInfo LoginInfo { get; set; }
    }

    public class Message
    {
        public Guid Id { get; set; }

        [JsonProperty(TypeNameHandling = TypeNameHandling.All)]
        public object Body { get; set; }
    }

    internal class Program
    {
        private static void Main(string[] args)
        {
            var scheduleJob = new ScheduleJobCommand
                {
                    JobName = "name",
                    Url = "url"
                };
            var login = new LoginInfo
                {
                    UserName = "username",
                    Password = "password"
                };
            var createUser = new CreateUserCommand
                {
                    CreatedOn = DateTime.UtcNow,
                    LoginInfo = login
                };

            var msg1 = new Message
                {
                    Id = Guid.NewGuid(),
                    Body = scheduleJob
                };
            var binder = new TypeNameSerializationBinder("JsonType1.{0}, JsonType1");
            string serializedMsg1 = JsonConvert.SerializeObject(msg1,
                                                           Formatting.Indented,
                                                           new JsonSerializerSettings
                                                           {
                                                               TypeNameHandling = TypeNameHandling.Auto,
                                                               Binder = binder
                                                           });
            Console.WriteLine(serializedMsg1);

            var msg2 = new Message
            {
                Id = Guid.NewGuid(),
                Body = createUser
            };
            string serializedMsg2 = JsonConvert.SerializeObject(msg2,
                                                                       Formatting.Indented,
                                                                       new JsonSerializerSettings
                                                                           {
                                                                               TypeNameHandling = TypeNameHandling.Auto,
                                                                               Binder = binder
                                                                           });
            Console.WriteLine(serializedMsg2);

            Message msg2b = JsonConvert.DeserializeObject<Message>(serializedMsg2, new JsonSerializerSettings
                {
                    Binder = binder
                });
            Console.WriteLine(msg2b.Id);
            Console.WriteLine(((CreateUserCommand) msg2b.Body).LoginInfo.UserName);

            Console.WriteLine("Press ENTER to exit.");
            Console.ReadLine();
        }
    }
}