using System;

using System.Reflection;

using System.Globalization;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

​

public class Program

{

    public static void Main()

    {

        string jsonString = "{\"1\": 1.654764367578323,\"3\": 1.654764367578323,\"4\": 1.654764367578323,\"6\": 1.654764367578323,\"12\": 1.13901127184207}";

        JObject d = (JObject)JsonConvert.DeserializeObject(jsonString);

        Console.WriteLine(d["1"].Value<string>());

    }

}

​

​