Example of sending and receiving TCP data using sockets in C # in asp.net

Program code

The code is as follows

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Using System; Using System.Collections.Generic; Using System.Net; Using System.Net.Sockets; Using System.Text; Namespace ConsoleApplication1 { public static Class Sockettest { private static Encoding encode = Encoding.default;        ///<summary>        / Listen for requests        ///</summary>         ///<param name= "Port" ></PARAM>         Public static void Listen (int port)         {              Socket listensocket = new socket (AddressFamily.InterNetwork, SocketType.Stream, PROTOCOLTYPE.TCP);             Listensocket.bind (New IPEndPoint ( Ipaddress.any, port));             Listensocket.listen (100);             Console.WriteLine ("Listen" + Port + "...");             while (true)              {                  Socket acceptsocket = listensocket.accept ();                 String Receivedata = Receive (AcceptSocket, 5000); 5 Seconds timeout.                 Console.WriteLine ("Receive:" + receivedata);                 Acceptsocket.send (encode. GetBytes ("OK"));                 Destroysocket ( AcceptSocket); Import            }         }        ///<summary>        / Send data        ///</summary>         ///<param name= "host" ></PARAM>        ///< Param name= "Port" ></param>        ///<param name= "Data" > </param>        ///<returns></returns>          public static string Send (string host, int port, string data)          {             string result = String. Empty; Socket clientsocket = new socket (addressfamily.internetwork, SocketType.Stream, protocoltype.tcp); Clientsocket.connect (host, Port); Clientsocket.send (encode. GetBytes (data)); Console.WriteLine ("Send:" + data); result = Receive (Clientsocket, 5000 * 2); 5*2 seconds timeout. Console.WriteLine ("Receive:" + result); Destroysocket (Clientsocket); return result; } <summary> Receive data </summary> <param name= "Socket" ></param> <param name= "Timeout" ></param> <returns></returns> private static string Receive (socket socket, int timeout) { string result = String. Empty; Socket. ReceiveTimeout = timeout; list<byte> data = new list<byte> (); byte[] buffer = new byte[1024]; int length = 0; Try { while (length = socket. Receive (buffer)) > 0) { for (int j = 0; J < length; J + +) { Data. ADD (Buffer[j]); } if (length < buffer. Length) { Break } } } Catch {} if (data. Count > 0) { result = encode. GetString (data. ToArray (), 0, data. Count); }             return result;        }        ///<summary>        / Destroy the Socket object        ///</summary>         ///<param name= "socket" ></PARAM>         private static void Destroysocket (socket socket)         {              if (socket. Connected)             {                  socket. Shutdown (Socketshutdown.both);            }             socket. Close ();        }    } }

To run the server listening for data:

The code is as follows	Copy Code
Sockettest.listen (8888);

To send and receive TCP data:

Sockettest.send ("127.0.0.1", 8888, "www.111cn.net");]