using System;

using Newtonsoft.Json;

using System.Collections.Generic;

using System.Linq;

​

​

    public static class extent {

        public static  ICollection<KeyValuePair<U,V>> To<U,V>(this Dictionary<U,V> d) {

                  return d.ToHashSet() as ICollection<KeyValuePair<U,V>>;   

        }

    }

​

public class Program

{

    public static void Main()

    {

        var str = @"{'greeting':[{'greet1': 'hey','greet2': 'hi'}],'bye': [{'bye1': 'adios'}]}";

        var a = JsonConvert.DeserializeAnonymousType(

                    System.Uri.UnescapeDataString(str),

                new Dictionary<Object, dynamic>());

        var pairs = a.To(); 

        pairs.Dump();

        a.First().Dump();

    }

}