using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        Foo foo = new Foo { MyRootAttr = "My Value" };

        string json = JsonConvert.SerializeObject(foo, Formatting.Indented);

        Console.WriteLine(json);

        Console.WriteLine("\n------------\n");

        Foo foo1 = JsonConvert.DeserializeObject<Foo>(json);

        Console.WriteLine("MyRootAttr: " + foo1.MyRootAttr);

    }

}

​

class Foo

{

    [JsonConverter(typeof(WrappedStringConverter))]

    public string MyRootAttr { get; set; }

}

​

class WrappedStringConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return (objectType == typeof(string));

    }

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

    {

        string s = (string)value;

        JObject jo = new JObject(new JProperty("value", s));

        jo.WriteTo(writer);

    }

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

    {

        JObject jo = JObject.Load(reader);

        return (string)jo["value"];

    }

}

​