CardMarketBotServer/CardMarketServer/Program.cs

using System.Net;
using System.Net.Sockets;

namespace CardMarketServer
{
    internal class Program
    {
        private static object _lock = new object();
        private static readonly List<TcpClient> _clients = new List<TcpClient>();

        public static TcpClient[] GetClients()
        {
            lock(_lock ) return _clients.ToArray();
        }

        public static int GetClientCount()
        {
            lock(_lock) return _clients.Count;
        }

        public static void RemoveClient(TcpClient client)
        {
            lock(_lock) _clients.Remove(client);
        }

        public static void AddClient(TcpClient client)
        {
            lock(_lock) _clients.Add(client);
        }
        static void Main(string[] args)
        {
            IPAddress ip = IPAddress.Parse("0.0.0.0");
            TcpListener ServerSocket = new TcpListener(ip, 4000);
            ServerSocket.Start();
            Console.WriteLine("Server started");
            while(true)
            {
                TcpClient clientSocket = ServerSocket.AcceptTcpClient();
                Console.WriteLine($"Client connected: {clientSocket.Client.RemoteEndPoint}");
                AddClient(clientSocket);
                handleClient client = new handleClient();
                client.startClient(clientSocket);

                Console.WriteLine($"{GetClientCount()} clients connected");
            }
        }
    }
}