c# 网络编程知识整理（一）

今天学习了c#网络编程的一些东西，在这里记下来。

1、客户端连接远程服务器

     TcpClient client = new TcpClient();      client.Connect(IPAddress.Parse("192.168.0.123"), 8500);

2、服务端打开端口等待客户端连接   

     IPAddress ip = new IPAddress(new byte[] { 192, 168, 0, 123 });       TcpListener listener = new TcpListener(ip, 8500);       listener.Start();       Console.WriteLine("Start Listenning ...");       while (true)       {          TcpClient client = listener.AcceptTcpClient();       }

3、发送消息

     byte[] temp = Encoding.Unicode.GetBytes(msg);

     NetworkStream streamToServer.Write(temp, 0, temp.Length);

     同步接收消息

     int byteRead = streamToClient.Read(buffer, 0, 8192);

     string msg = Encoding.Unicode.GetString(buffer, 0, byteRead);

     异步接收消息

     AsyncCallback callBack = new AsyncCallback(ReadComplete);       streamToServer.BeginRead(buffer, 0, BufferSize, callBack, null);

      ReadComplete（IAsyncResult ar）是回调函数，当异步接收执行完成以后，会自动调用回调函数。   

        private void ReadComplete(IAsyncResult ar)         {             int bytesRead;             try             {                 lock (streamToServer)                 {                     bytesRead = streamToServer.EndRead(ar);                 }                 if (bytesRead == 0)                 {                     throw new Exception("读取到0字节");                 }                 string msg = Encoding.Unicode.GetString(buffer, 0, bytesRead);                 Console.WriteLine("Received: {0}",msg);                 Array.Clear(buffer, 0, buffer.Length);                 lock (streamToServer)                 {                     AsyncCallback callBack = new AsyncCallback(ReadComplete);                     streamToServer.BeginRead(buffer, 0, BufferSize, callBack, null);                 }             }             catch(Exception ex)             {                 if (streamToServer != null)                 {                     streamToServer.Dispose();                     client.Close();                     Console.WriteLine(ex.Message);                     return;                 }             }         }