using System;

using System.Collections;

using System.Collections.Generic;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;

​

    class Car

    {

        public StringId Id { get; set; }

        public string Name { get; set; }

    }

​

    [JsonConverter(typeof(StringIdConverter))]

    class StringId

    {

        public string Value { get; set; }

    }

​

    class StringIdConverter : JsonConverter

    {

        public override bool CanConvert(Type objectType)

        {

            return objectType == typeof(StringId);

        }

​

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

        {

            if (reader.TokenType == JsonToken.Null)

                return null;

            var token = JToken.Load(reader);

            return new StringId { Value = (string)token };

        }

​

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

        {

            var id = (StringId)value;

            writer.WriteValue(id.Value);

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            var test = new Car { Id = new StringId { Value = "1492" }, Name = "my name" };

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

            Console.WriteLine(json);

​

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

            Console.WriteLine("Deserialized Id.Value: ");

            Console.WriteLine(test2.Id.Value);

        }

    }

​