MFF

gistfile1.txt

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading.Tasks;

namespace EchoServer
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Echo server is running...");
            Console.WriteLine("Press Ctrl-C to exit.");
            Console.WriteLine();

            var listener = new TcpListener(IPAddress.Any, 50001);
            listener.Start();

            while (true)
            {
                var client = listener.AcceptTcpClientAsync()?.Result;
                if (client == null)
                {
                    return;
                }
                Console.WriteLine($"Client {client.Client.RemoteEndPoint} connected...");

                Task.Factory.StartNew(() =>
                {
                    var stream = client.GetStream();

                    while (true)
                    {
                        var data = stream.ReadByte();
                        if (data < 0)
                        {
                            break;
                        }
                        stream.WriteByte((byte)data);
                    }
                    Console.WriteLine($"Client {client.Client.RemoteEndPoint} disconnected...");
                });
            }
        }
    }
}