using System;

using System.Collections.Generic;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        DeckCollection coll = new DeckCollection(){ Version = 1 };

        coll.Decks = new Dictionary<string, Deck>();

        Deck deck1 = new Deck();

        deck1.Name = "1";

        deck1.ImageUrl = "asodijasodij";

        Deck deck2 = new Deck();

        deck2.Name = "1";

        deck2.ImageUrl = "sdasdsd";

        coll.Decks.Add("PRIMO", deck1);

        coll.Decks.Add("SECON", deck2);

        DeckCollectionLIST collList = new DeckCollectionLIST();

        collList.Decks = new List<Deck>();

        foreach (KeyValuePair<string, Deck> item in coll.Decks)

        {

            collList.Decks.Add(item.Value);

        }

        string json = JsonConvert.SerializeObject(collList, Formatting.Indented);

        Console.WriteLine(json);

    }

}

​

​

public class Deck

    {

        public int Id { get; set; }

        public string Name { get; set; }

        public string ImageUrl { get; set; }

    }

​

    public class DeckCollection

    {        

        public int Version { get; set; }

        public Dictionary<string, Deck> Decks { get; set; }

    }

​

public class DeckCollectionLIST

    {        

        public int Version { get; set; }

        public List<Deck> Decks { get; set; }

    }