Basic structure for a WebSocket communication (multitask ready) with C# / Alchemy

websocket.coffee

$ -> 
  ws = new WebSocket "ws://localhost:81"
  ws.onmessage = (evt) ->
    console.log evt

WSServer.cs

using System;
using System.Collections.Concurrent;
using System.Net;
using System.Threading;
using System.Threading.Tasks;
using Alchemy;
using Alchemy.Classes;

namespace WebSocketsDemo {
    class WSServer {

        private WebSocketServer server;
        private static ConcurrentDictionary<int, UserContext> Clients = new ConcurrentDictionary<int, UserContext>();
        private UserContext nul = null;

        public WSServer() {
            server = new WebSocketServer(81, IPAddress.Any) {
                OnConnected = (UserContext user) => Clients.TryAdd(user.GetHashCode(), user),
                OnDisconnect = (UserContext user) => Clients.TryRemove(user.GetHashCode(), out nul)
            };
        }

        public void Start() {
            server.Start();

            int i = 0;
            Task.Factory.StartNew(() => {
                while(true) {
                    Console.WriteLine(Clients.Count + " clients");
                    foreach(var u in Clients)
                        u.Value.Send("iteration nb " + i);
                    i++;
                    Thread.Sleep(1000);
                }
            });

            var command = string.Empty;
            while(command != "exit")
                command = Console.ReadLine();
        }

    }
}