private SerialPort serialPort;//串口对象类private string strPortDataReceived = "";//记录串口返回值private string serialPortName = "";//记录端口号private bool isGet = false;/// <summary>/// 获取产品设备号/// </summary>/// <returns>设备号</returns>public List<string> GetProductNumBySerialPort(){List<string> productNumList = new List<string>();string[] ports = SerialPort.GetPortNames();if (ports.Length > 0){for (int i = 0; i < ports.Length; i++){string portName = ports[i];serialPort = new SerialPort(portName, 115200, Parity.None, 8, StopBits.One);//serialPort.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived);//DataReceived事件委托serialPort.ReceivedBytesThreshold = 1;serialPort.RtsEnable = true;serialPort.WriteTimeout = 500;serialPort.ReadTimeout = 500;try//这里写成异常处理的形式以免串口打不开程序崩溃
                    {serialPort.Open();}catch { }if (serialPort.IsOpen){//byte[] ar = StringToByteHelper.HexStringToByteArray("1F1109");byte[] WriteBuffer = new byte[] { 0x1F, 0x11, 0x09 };try{serialPort.Write(WriteBuffer, 0, WriteBuffer.Length);//获取设备编号
                        }catch (Exception ex){string str = ExceptionClass.GetExceptionMsg(ex, "串口读写超时"+ "\r\n");ExceptionClass.WriteException(str);}//Thread.Sleep(100);int r = 0;//读取返回数据while (serialPort.BytesToRead == 0){r++;Thread.Sleep(1);if (r >= 500){break;}}Thread.Sleep(50); //50毫秒内数据接收完毕，可根据实际情况调整r = 0;byte[] recData = new byte[serialPort.BytesToRead];serialPort.Read(recData, 0, recData.Length);string strPortDataReceived = System.Text.Encoding.Default.GetString(recData);Console.WriteLine(strPortDataReceived);if (strPortDataReceived.Length >= 17){productNumList.Add(strPortDataReceived.Substring(2, 4));}serialPort.Close();//关闭该端口
                    }else{//MessageBox.Show("串口打开失败!");//return false;
                    }}}else{//MessageBox.Show("没有可用的串口!");
            }return productNumList;}