public System.IO.Ports.SerialPort BoundCom = new System.IO.Ports.SerialPort();
private StringBuilder BoundCombuilder = new StringBuilder();//避免在事件处理方法中反复的创建，定义到外面。
private bool CheckComPortScanner(string port,string rate)
{
    try
    {
    BoundCom.PortName = port;  //端口名称，默认COM1
    BoundCom.BaudRate = Convert.ToInt32(rate);  //波特率，默认9600
    BoundCom.DataBits = 8;  //数据位，默认8
    BoundCom.StopBits = System.IO.Ports.StopBits.One;  //停止位，默认 System.IO.Ports.StopBits.One
    BoundCom.Parity = System.IO.Ports.Parity.None;  //奇偶校验，默认 System.IO.Ports.Parity.None
    BoundCom.Encoding = System.Text.Encoding.GetEncoding("GB2312");
    BoundCom.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(BoundCom_DataReceived);
    if (!BoundCom.IsOpen)
    {
        BoundCom.Open();
    }
    RBAppText("串口端口：" + port + "   波特率：" + rate + "  已开启监听");
    }
    catch (Exception ex)
    {
    RBAppText("错误：串口端口：" + port + "   波特率：" + rate + "，校验失败，错误原因：" + ex.Message);
    return false;
    }         
    return true;
}

private void BoundCom_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
 {
     if (!BoundCom.IsOpen) return;//串口已经关闭
     this.Invoke((EventHandler)(delegate
     {
     byte[] buffer = new byte[BoundCom.BytesToRead];
     BoundCom.Read(buffer, 0, buffer.Length);
     string str =Encoding.Default.GetString(buffer);
     this.txtSNo.Text = str;

     RBAppText("成功：串口" + BoundCom.PortName + "数据已接收");
     }));
 }

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