.NET WinForm读取扫描枪从COM口传过来的数据，显示在TextBox中，并做其他操作。

　　

  private string portName = "";   //串口
        private int baudRate = 0;         //速率
        private int dataBits = 0;         //数据位        
        int scanNum = 0;
        int noRead = 0;
        string strReceive = "";
        string serialNumber = "";
        string url = "";
        int SocketPort = 0;
        bool isDispose = false;//是否在处理COM数据,true为正在处理，false空闲
        private void DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                strReceive = ReadCOM.serialport.ReadExisting();
                if (string.IsNullOrEmpty(strReceive))
                {
                    return;
                }
                else
                {
                    if (!isDispose)
                    {
                        BackgroundWorker bgWorker = new BackgroundWorker();
                        bgWorker.DoWork += new DoWorkEventHandler(bgWorker_DoWork);
                        bgWorker.RunWorkerAsync(strReceive);
                        return;
                    }
                }
            }
            catch (System.Exception ex)
            {
                throw new Exception(ex.Message);
            }

        }
        private void bgWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            isDispose = true;
            this.Invoke((EventHandler)(delegate
            {
                this.txtGlassID.Text = strReceive;
                this.txtGlassID.Refresh();
                KeyEventArgs ev = new KeyEventArgs(Keys.Enter);
                txtGlassID_KeyDown(sender, ev);
                isDispose = false;

            }));
        }
        private void OpenPort()
        {
            if (ReadCOM.serialport.IsOpen)
            {
                ReadCOM.serialport.Close();
            }
            ReadCOM.serialport.PortName = portName;
            ReadCOM.serialport.BaudRate = baudRate;
            ReadCOM.serialport.Parity = Parity.None;
            ReadCOM.serialport.DataBits = dataBits;
            ReadCOM.serialport.StopBits = StopBits.One;
            //打开串口
            ReadCOM.serialport.Open();   

        }
         try
            {
               // serialport.DataReceived = null;
                //if (serialport != null )
                //{
                //    serialport.Clofse();
                //}
                //serialport = new SerialPort();
                ReadCOM.serialport.DataReceived += DataReceived;
                portName = ConfigurationManager.AppSettings["PortName"].ToString();
                baudRate = int.Parse(ConfigurationManager.AppSettings["BaudRate"]);
                dataBits = int.Parse(ConfigurationManager.AppSettings["DataBits"]);
                serialNumber = ConfigurationManager.AppSettings["SerialNumber"].ToString();
                SocketPort = int.Parse(ConfigurationManager.AppSettings["SocketPort"]);
                this.OpenPort();
                //this.GetReaderStatu();
            }
            catch (System.Exception ex)
            {
               // MessageBox.Show("程序已启动或串口已被占用！");
                MessageBox.Show(ex.Message);
            }