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;

​

​

    class Car

    {

        public StringId Id { get; set; }

        public string Name { get; set; }

    }

​

    [TypeConverter(typeof(StringIdConverter))]

    class StringId

    {

        public string Value { get; set; }

    }

​

    class StringIdConverter : TypeConverter

    {

        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)

        {

            if (sourceType == typeof(string))

                return true;

            return base.CanConvertFrom(context, sourceType);

        }

​

        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)

        {

            if (destinationType == typeof(StringId))

                return true;

            return base.CanConvertTo(context, destinationType);

        }

​

        public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)

        {

            if (value is string)

            {

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

            }

            return base.ConvertFrom(context, culture, value);

        }

​

        public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)

        {

            if (destinationType == typeof(string) && value is StringId)

            {

                return ((StringId)value).Value;

            }

            return base.ConvertTo(context, culture, value, destinationType);

        }

    }

​

    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);

        }

    }