using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        Foo existing = new Foo

        {

            Name = "Foo",

            Size = "Large",

            Color = "Blue"

        };

        DumpFoo(existing, "original foo");

​

        JObject obj = JsonConvert.DeserializeObject<JObject>(@"{ ""Quantity"": 23, ""Color"": ""Red"", ""Extra"": ""Will be ignored"" }");

        obj.PopulateObject<Foo>(existing);

        DumpFoo(existing, "foo after copying properties from JSON");

​

    }

    private static void DumpFoo(Foo foo, string msg)

    {

        Console.WriteLine("--- " + msg + " ---");

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

        Console.WriteLine("Size: " + foo.Size);

        Console.WriteLine("Color: " + foo.Color);

        Console.WriteLine("Quantity: " + foo.Quantity);

        Console.WriteLine();

    }

}

​

class Foo

{

    public string Name { get; set; }

    public string Size { get; set; }

    public string Color { get; set; }

    public int Quantity { get; set; }

}

​

public static class JsonExtensions

{

    public static void PopulateObject<T>(this JToken jt, T target)

    {

        JsonSerializer serializer = new JsonSerializer();

        serializer.Populate(jt.CreateReader(), target);

    }

}

​