1       public static bool PortIsUse(int port)
 2         {
 3             bool isUse = false;
 5             IPGlobalProperties ipProperties = IPGlobalProperties.GetIPGlobalProperties();
 6             IPEndPoint[] ipEndPoints = ipProperties.GetActiveTcpListeners();//找到已用端口
 8             foreach (IPEndPoint endPoint in ipEndPoints)
 9             {
10                 if (endPoint.Port == port)//判断是否存在
11                 {
12                     isUse= true;
13                     break;
14                 }
15             }
16             return isUse;
17         }

 1             TcpListener tcpl = new TcpListener(new IPAddress(new byte[] { 127, 0, 0, 1 }), 1111);//定义一个TcpListener对象监听本地的1111端口
 2             tcpl.Start();//监听开始
 3             while (true)
 4             {
 6                 Socket s = tcpl.AcceptSocket();//挂起一个Socket对象
 7                 string remote = s.RemoteEndPoint.ToString();//获取发送端的IP及端口转为String备用
 8                 Byte[] stream = new Byte[1024];
 9                 s.Receive(stream);//接收发送端发过来的数据,写入字节数组
10                 //BGW_Handle.ReportProgress(1, "接收来自[" + remote + "]信息");
11                 string _data = Encoding.UTF8.GetString(stream);//将字节数据数组转为String
12                 s.Send(stream);//将接收到的内容，直接返回接收端
13                 s.Shutdown(SocketShutdown.Both);
14             }
15             tcpl.Stop();//停止监听

               IPAddress ip = IPAddress.Parse("127.0.0.1");//接收端所在IP
 3             IPEndPoint ipEnd = new IPEndPoint(ip, 1111);//接收端所监听的接口
 4             Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//初始化一个Socket对象
 5             try
 6             {
 7                 socket.Connect(ipEnd);//连接指定IP&端口
 8             }
 9             catch (SocketException e)
10             {
11                 Console.WriteLine("连接失败");
12                 Console.WriteLine(e.ToString());
14                 return;
15             }
16             socket.Send(Encoding.UTF8.GetBytes("1234567890"));//发送数据
17             while (true)//定义一个循环接收返回数据
18             {
19                 byte[] data = new byte[1024];
20                 socket.Receive(data);//接收返回数据
21                 string  stringData = Encoding.UTF8.GetString(data);
22                 if (!string.IsNullOrWhiteSpace(stringData))
23                 {
24                     Console.Write(stringData);
25                     break;
26                 }
27             }29             socket.Shutdown(SocketShutdown.Both);
30             socket.Close();//关闭Socket