当接收数据时，[serialport_datareceived]事件发生了不止一次(使用虚拟串行端口)

Question

我正在尝试使用虚拟序列端口程序发送数据并通过串行通信接收。但这是问题...让我们假设A是传输数据，并且B是接收数据。

将数据发送到B。B接收数据两次（SerialPort_DataReceived事件发生两次！）。

每次b关闭序列上并再次打开时，序列port_datareceived事件发生增加。

我不知道为什么会发生。

A(transmit)
BaudRate = 9600
Parity = None
DataBits = 8
StopBits = 1
    public transmit()
    {
        InitializeComponent();
        foreach (String s in System.IO.Ports.SerialPort.GetPortNames())
        {
            cBoxPort.Items.Add(s);          
        }
    }
    private void CBoxBaudRate_SelectedIndexChanged(object sender, EventArgs e)
    {
        serialPort1.BaudRate = Convert.ToInt32(cBoxBaudRate.Text);                          
    }
    private void CBoxStopBits_SelectedIndexChanged(object sender, EventArgs e)
    {
        serialPort1.StopBits = (StopBits)Enum.Parse(typeof(StopBits), cBoxStopBit.Text);   
    }
    private void CBoxDataBits_SelectedIndexChanged(object sender, EventArgs e)
    {
        serialPort1.DataBits = Convert.ToInt32(cBoxDataBits.Text);                          
    }
    private void CBoxParityBits_SelectedIndexChanged(object sender, EventArgs e)
    {
        serialPort1.Parity = (Parity)Enum.Parse(typeof(Parity), cBoxParity.Text);           
    }
    private void btnConnect_Click(object sender, EventArgs e)
    {
        try
        {
            serialPort1.PortName = cBoxPort.Text;
            serialPort1.BaudRate = Convert.ToInt32(cBoxBaudRate.Text);
            serialPort1.DataBits = Convert.ToInt32(cBoxDataBits.Text);
            serialPort1.StopBits = (StopBits)Enum.Parse(typeof(StopBits), cBoxStopBit.Text);
            serialPort1.Parity = (Parity)Enum.Parse(typeof(Parity), cBoxParity.Text);
            serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);
            serialPort1.Open();
            txtReceive.AppendText("Connectedn");   
            btnConnect.Enabled = false;             
            btnClose.Enabled = true;
            btnSend.Enabled = true;
        }
        catch (Exception ex)
        {
            return;
        }
    }
    private void btnClose_Click(object sender, EventArgs e)
    {
        if (serialPort1.IsOpen)
        {
            serialPort1.Close();                        
            btnClose.Enabled = false;
            btnConnect.Enabled = true;
            btnSend.Enabled = false;
            txtReceive.AppendText("Disconnectedn");  
        }
    }
    private void btnSend_Click(object sender, EventArgs e)
    {
        byte[] bytesend = { 0x00 };
        Debug.WriteLine("111");
        serialPort1.Write(bytesend, 0, bytesend.Length);
    }
    private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        Debug.WriteLine("444");
    }
}

b（接收）

    byte[] bytesend;
    //Initial Conditions(SerialPort)
    private void receive_Load(object sender, EventArgs e)
    {
        cBoxBaudRate.SelectedIndex = 0;     //BaudRate = 9600
        cBoxParity.SelectedIndex = 0;       //Parity = None
        cBoxDataBits.SelectedIndex = 0;     //DataBits = 8
        cBoxStopBit.SelectedIndex = 0;      //StopBits = 1
        cBoxPort.SelectedIndex = 1;         
        btnConnect.Enabled = true;
        btnClose.Enabled = false;
    }
    //Show usable CommPort
    public receive()
    {
        InitializeComponent();
        foreach (String s in System.IO.Ports.SerialPort.GetPortNames())
        {
            cBoxPort.Items.Add(s);
        }
    }
    //Connection
    private void btnConnect_Click(object sender, EventArgs e)
    {
        serialPort1.PortName = cBoxPort.Text;
        serialPort1.BaudRate = Convert.ToInt32(cBoxBaudRate.Text);
        serialPort1.DataBits = Convert.ToInt32(cBoxDataBits.Text);
        serialPort1.StopBits = (StopBits)Enum.Parse(typeof(StopBits), cBoxStopBit.Text);
        serialPort1.Parity = (Parity)Enum.Parse(typeof(Parity), cBoxParity.Text);
        serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);
        serialPort1.Open();
        btnConnect.Enabled = false;
        btnClose.Enabled = true;
    }
    private void btnClose_Click(object sender, EventArgs e)
    {
        if (serialPort1.IsOpen)
        {
            serialPort1.Close();
            btnClose.Enabled = false;
            btnConnect.Enabled = true;
        }
    }
    private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        Debug.WriteLine("222");
    }

当我调试此代码输出时，代表111222222。并且当我按关闭和连接按钮时，输出表示111 222 222 222。

Answer 1

每次B关闭序列上并再次打开时， SerialPort_DataReceived事件发生增加。

对，因为就像我说的那样，您应该只接线一次DataReceived事件。每次单击按钮时，都会添加另一个处理程序，从而导致单个接收的多个触发。这与多线程无关。将从按钮单击事件从按钮上移动处理程序的线路到加载事件：

：

private void transmit_Load(object sender, EventArgs e)
{
    serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived); // now it only gets called once
    // ... other existing code ...
}

private void btnConnect_Click(object sender, EventArgs e)
{
    try
    {
        serialPort1.PortName = cBoxPort.Text;
        serialPort1.BaudRate = Convert.ToInt32(cBoxBaudRate.Text);
        serialPort1.DataBits = Convert.ToInt32(cBoxDataBits.Text);
        serialPort1.StopBits = (StopBits)Enum.Parse(typeof(StopBits), cBoxStopBit.Text);
        serialPort1.Parity = (Parity)Enum.Parse(typeof(Parity), cBoxParity.Text);
        // serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);  // remove this line
        serialPort1.Open();
        txtReceive.AppendText("Connectedn");   
        btnConnect.Enabled = false;             
        btnClose.Enabled = true;
        btnSend.Enabled = true;
    }
    catch (Exception ex)
    {
        return;
    }
}

您还需要在接收表格中做同样的事情。