private void SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            if (this.InvokeRequired)
            {
                this.BeginInvoke(new DataReceived(SerialPort_DataReceived), sender, e);   //DataReceived为代理类型
                return;
            }

            if (!SerialPortRuning)
            {
                SerialPortRuning = true;
                try
                {
                    // 接收串口数据
                }
                catch (Exception ex)
                {
                }
                finally
                {
                    SerialPortRuning = false;
                }
            }
        }