using System.IO;

using System;

using System.Web;

using Newtonsoft.Json; 

using  Newtonsoft.Json.Linq;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        string jsonString = @"{

  'name': 'John Smith',

  'value': '12'

}";

        JToken tok = JToken.Parse(jsonString);

        var serializer = JsonSerializer.Create(new JsonSerializerSettings() {TypeNameHandling = TypeNameHandling.Objects });

        Facet vg = tok.ToObject<Facet>(serializer);

        //Console.WriteLine(Json);

​

        string json = JsonConvert.SerializeObject(vg, new JsonConverter[] {new KeysJsonConverter()});

​

Console.WriteLine(json);

    }

  public class Facet

    {

       [JsonProperty("name")]

        public string Facetx { get; set; }

      // [JsonProperty("value")]

       [JsonProperty("value")]

        public int Count { get; set; }

    }

    class KeysJsonConverter : JsonConverter

{

    //private readonly Type[] _types;

​

    public KeysJsonConverter()

    {

        //_types = types;

    }

​

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

    {

​

        Facet f = (Facet)value;

        JObject o = new JObject();

            IList<string> propertyNames = typeof(Facet).GetProperties().Select(fd => fd.).ToList();

​

            o.AddFirst(new JProperty("Keys", new JArray(propertyNames)));

​

            o.WriteTo(writer);

    }

​

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

    {

        throw new NotImplementedException("");

    }

​

    public override bool CanRead

    {

        get { return false; }

    }

​

    public override bool CanConvert(Type objectType)

    {

        return true;

    }

}

​

}