using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        Foo foo = new Foo

        {

            Id = 24,

            Name = "Bar",

            EmbeddedJson = @"{ ""Baz"" : ""Quux"" }"

        };

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

        Console.WriteLine(json);

        Console.WriteLine();

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

        Console.WriteLine("Id = " + foo.Id);

        Console.WriteLine("Name = " + foo.Name);

        Console.WriteLine("EmbeddedJson = " + foo.EmbeddedJson);

    }

}

​

class Foo

{

    public int Id { get; set; }

    public string Name { get; set; }

    [JsonConverter(typeof(RawJsonConverter))]

    public string EmbeddedJson { get; set; }

}

​

class RawJsonConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return (objectType == typeof(string));

    }

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

    {

        writer.WriteRawValue((string)value); // assumes string is already JSON

    }

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

    {

        return JToken.Load(reader).ToString(Formatting.None);

    }

}

​