检验端口是否被调用

 占用了端口，还得监测。（这个通信更简单）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.Threading;

namespace ConsoleApplication1
{
    class UsePort
    {
        private int port;

        public int Port
        {
            get { return port; }
            set { port = value; }
        }
        string ip;

        public string Ip
        {
            get { return ip; }
            set { ip = value; }
        }

        protected void SendMessage( string message)
        {
            TcpListener tListenser = null;
            IPEndPoint ipPort = new IPEndPoint(IPAddress.Parse(ip),port);
            try
            {
                tListenser = new TcpListener(ipPort);
                tListenser.Start();
                while (true)
                {
                    Console.WriteLine("the port: " + Port.ToString() + " in " + Ip + " is used....");
                    Thread.Sleep(1000); 
                }

            }
            catch (Exception)
            { 
            }
        }

        protected static void ReceiveMessage()
        {

            try
            {
                TcpClient client = new TcpClient("127.0.0.1", 5000);
                Console.WriteLine("connection is OK");

            }
            catch(Exception)
            {
                Console.WriteLine("connection is Failed");

            }

        }

        public static void Run()
        {
            UsePort up = new UsePort { Ip = "127.0.0.1", Port = 5000 };
            new Thread(ReceiveMessage).Start();

            up.SendMessage("pppppppppp");

            
        }

    }
}

结果：