新手求教：C#串口读数据

Question

小弟刚刚接触C#，弱弱地问一下， 想只读串口数据，并且收到"123"后关闭串口。
  SerialPort port = new SerialPort();              port.Open();
            string recv = port.ReadLine();
            Regex rx = new Regex("123");
            if (rx.IsMatch(recv))
            {
                port.Close();     
            }
            else
            {
               ...         
            }请问哪里有错误， 十分感谢！

Answer 1

this.serialPort1.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(this.serialPort1_DataReceived);
private void buttonOpen_Click(object sender, EventArgs e)
        {     
               try
                {                    serialPort1.Open();
                 }
                catch
                {
                    MessageBox.Show(" 打开串口出错!");
                }
            }
  
 private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            byte[] buffer = new byte[24];
            try
            {
                int _iLength= serialPort1.Read(buffer, 0, 24);
                
                
               // WriteLog("R: " + BitConverter.ToString(buffer, 0, _iLength));
            }
            catch (Exception ex)
            {
               // WriteLog("R: " + ex.Message);
            }
        }      }

Answer 2

  SerialPort   port   =   new   SerialPort();                            port.Open();
                        string   recv   =   port.ReadLine();
                        Regex   rx   =   new   Regex("123");
                        while   (!rx.IsMatch(recv))
                        {
                                recv   =   port.ReadLine();         
                        }
port.Close();

Answer 3

 谢谢lye2000000_super， 怎么把分给你？同样感谢lljfl，但我只需要console的代码，不能给你分。