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TCP通信需要通信双方都在线，所以需要先启动服务端进行监听，客户端才能获得连接，服务端代码：
static void Main(string[] args) { TcpClient client = null; NetworkStream stream = null; byte[] buffer = null; string receiveString = null; IPAddress localIP = IPAddress.Parse("127.0.0.1"); int localPort = 11000; TcpListener listener = new TcpListener(localIP, localPort);//用本地IP和端口实例化Listener listener.Start();//开始监听 while (true) { client = listener.AcceptTcpClient();//接受一个Client buffer = new byte[client.ReceiveBufferSize]; stream = client.GetStream();//获取网络流 stream.Read(buffer, 0, buffer.Length);//读取网络流中的数据 stream.Close();//关闭流 client.Close();//关闭Client receiveString = Encoding.Default.GetString(buffer).Trim(‘\0‘);//转换成字符串 Console.WriteLine(receiveString); } }
只有服务端开启监听后，客户端才能正确连接，所以服务端要一直开启监听，客户端每次发送数据，都要首先与服务端建立连接，连接建立完成后才进行数据发送。客户端代码：
static void Main(string[] args) { string sendString = null;//要发送的字符串 byte[] sendData = null;//要发送的字节数组 TcpClient client = null;//TcpClient实例 NetworkStream stream = null;//网络流 IPAddress remoteIP = IPAddress.Parse("127.0.0.1");//远程主机IP int remotePort = 11000;//远程主机端口 while (true)//死循环 { sendString = Console.ReadLine();//获取要发送的字符串 sendData = Encoding.Default.GetBytes(sendString);//获取要发送的字节数组 client = new TcpClient();//实例化TcpClient try { client.Connect(remoteIP, remotePort);//连接远程主机 } catch (System.Exception ex) { Console.WriteLine("连接超时，服务器没有响应！");//连接失败 Console.ReadKey(); return; } stream = client.GetStream();//获取网络流 stream.Write(sendData, 0, sendData.Length);//将数据写入网络流 stream.Close();//关闭网络流 client.Close();//关闭客户端 } }
