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}";

        string attributes = "1,3,4,6,10,15,24";

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

        foreach(string attribute in attributes.Split(',')){

            bool attributeExist = d[attribute] != null;

            if(attributeExist){

                Console.WriteLine("Attribute " + attribute + " exists. Do your work here");

            }

            else{

                Console.WriteLine("Attribute " + attribute + " doesn't exist. Handle situtation here");

            }

        }

    }

}

​

​