public Form1()

        {

            InitializeComponent();

        }



      

        //初始化SerialPort对象方法.PortName为COM口名称,例如"COM1","COM2"等,注意是string类型

       public void InitCOM(string PortName)

         {

             serialPort1 = new SerialPort(PortName);

             serialPort1.BaudRate = 9600;//波特率

             serialPort1.Parity = Parity.None;//无奇偶校验位

             serialPort1.StopBits = StopBits.Two;//两个停止位

             serialPort1.Handshake = Handshake.RequestToSend;//控制协议

             serialPort1.ReceivedBytesThreshold = 4;//设置 DataReceived 事件发生前内部输入缓冲区中的字节数

           

        }



        

 

         //打开串口的方法

         public void OpenPort()

         {

             try

             {

                 serialPort1.Open();

             }

             catch { }

             if (serialPort1.IsOpen)

             {

                 Console.WriteLine("the port is opened!");

             }

             else

            {

                 Console.WriteLine("failure to open the port!");

             }

         }



         //关闭串口的方法

         public void ClosePort()

         {

             serialPort1.Close();

             if (!serialPort1.IsOpen)

            {

     &n