Winform SerialPort 串口扫码枪实例

        SerialPort serialPort = new SerialPort();

/// 

        /// 初始化串口
        /// 
        private void InitSerialPort()
        {
            log4netHelper.Info($"初始化串口开始");
            try
            {
                #region MyRegion
                if (serialPort.IsOpen)
                    serialPort.Close();
                //端口名  注:设备管理器中查看一下虚拟com口的名字
                string PortName = ConfigurationManager.AppSettings["PortName"].ToString();
                string BaudRate = ConfigurationManager.AppSettings["BaudRate"].ToString();
                string DataBits = ConfigurationManager.AppSettings["DataBits"].ToString();
                serialPort.PortName = !string.IsNullOrEmpty(PortName) ? PortName : "COM5";//串口
                serialPort.BaudRate = !string.IsNullOrEmpty(BaudRate) ? Convert.ToInt32(BaudRate) : 9600;//波特率，默认是9600
                serialPort.DataBits = !string.IsNullOrEmpty(DataBits) ? Convert.ToInt32(DataBits) : 1;//数据位
                serialPort.Parity = Parity.None;//校验位
                serialPort.StopBits = StopBits.One;//停止位
                serialPort.DiscardNull = true;
                serialPort.ReadTimeout = 1000;//设置读取超时时间为1秒
                serialPort.WriteTimeout = 1000; //设置写入超时时间为1秒
                if (!serialPort.IsOpen)
                {
                    serialPort.Close();
                }
                serialPort.Open();
                log4netHelper.Info($"初始化串口成功");
                serialPort.DataReceived += serialPort_DataReceived;//监听方法，具体看下面
                #endregion
            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message);
                log4netHelper.Info($"ERROR发生错误，扫描数据失败：{ex.Message}");
            }
        }

/// 

        /// 串口数据接收事件
        /// 
        /// 
        /// 
        private void serialPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            try
            {
                log4netHelper.Info($"serialPort_DataReceived");
                SerialPort serialPort = (SerialPort)sender;
                log4netHelper.Info($"串口接收长度：{serialPort.BytesToRead}");
                if (serialPort.BytesToRead == 0)
                {
                    return;
                }
                else
                {
                    #region
                    //Thread threadReceiveSub = new Thread(new ParameterizedThreadStart(ReceiveData));
                    //threadReceiveSub.Start(serialPort);
                    #endregion

                    #region
                    System.Threading.Thread.Sleep(200);//防止数据接收不完整 线程sleep(200)
                    //SerialPort serialPort = (SerialPort)serialPortobj;
                    //开辟接收缓冲区
                    byte[] receiveData = new byte[serialPort.BytesToRead];

                    //从串口读取数据
                    serialPort.Read(receiveData, 0, receiveData.Length);//同步读取数据
                    log4netHelper.Info($"串口接收数据为：" + receiveData + "，System.Text.Encoding.UTF8.GetString编码后" + System.Text.Encoding.UTF8.GetString(receiveData) + "，长度为：" + receiveData.Length);
                    string curBarCode = System.Text.Encoding.UTF8.GetString(receiveData, 0, receiveData.Length);
                    serialPort.ReadExisting();

                    if (string.IsNullOrEmpty(curBarCode))
                    {
                        this.UIThreadInvoke(new Action(() => { this.txtBarCode.Text = ""; }));
                        log4netHelper.Info($"串口接收数据转换结果为空！");
                        return;
                    }
                    else
                    {
                        //定义一个委托（delegate），委托（delegate）可以将参数与方法传递给控件所在的线程，并由控件所在的线程执行，通过Invoke来调用，这样可以完美的解决“线程间操作无效，从不是创建控件的线程访问它”
                        Action action = () =>
                        {
                            log4netHelper.Info($"串口接收数据转换结果为：" + curBarCode);
                            this.txtBarCode.Text = curBarCode;
                            int rowCount = IsBarcodeExist(curBarCode);//校验产品条码是否存在
                            if (rowCount > 0)
                            {
                                string msg = string.Format("产品条码信息【{0}】已存在，请重新扫码！", this.txtBarCode.Text.Trim());
                                log4netHelper.Info(msg);
                                this.lblResult.Text = msg;
                                this.lampStart.Status = Status.Close;
                                devActors[DevFullName].WriteChannelValue("Screwed_Start", 201);//向PCL中写入当前产品型号
                                log4netHelper.Info($"Screwed_Start写入PLC失败");
                                return;
                            }

                            WriteBarcodeToPLC(curBarCode, true);//将条码写到PCL
                            this.lampStart.Status = Status.OK;//开始信号灯
                            devActors[DevFullName].WriteChannelValue("Screwed_Start", 200);//向PCL中写入扫
                            log4netHelper.Info($"Screwed_Start写入PLC成功");

                            InitController();//初始化控件
                        };
                        Invoke(action);
                        log4netHelper.Info($"扫描截取信息：{curBarCode}");
                    }
                    serialPort.DiscardInBuffer();//丢弃来自串行驱动程序的接收缓冲区的数据
                    #endregion

                }
            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message);
                log4netHelper.Info("ERROR发生错误，扫描数据失败：" + ex.Message + "，" + ex.StackTrace.ToString());
            }
        }