添加引用 chatUDP1.Listen(7190);//绑定端口号 chatUDP1.Send(serverip, 7189, System.Text.Encoding.Default.GetBytes(htmlSendMsg.Text+"\r\n"));//发送内容 private void chatUDP1_DataArrival(byte[] Data, IPAddress Ip, int Port) { richTextBox2.Text += System.Text.Encoding.Default.GetString(Data