按钮发送命令 SerialPort1_DataReceived (EventArgs e) 发送和接收响应，与那些不需要它的人产生冲突

Question

//Button need DataRecieved  event handler
private void LoggedDataBtn_Click(object sender, EventArgs e)
{
    //When LoggDataBtn is pressed it Send the command LogToShow to  device
    string LoggedDataTOshow = "?R\r\n";
    string commForMeter = string.Format(LoggedDataTOshow);

    try
    {
        if (serialPortForApp.IsOpen)
        {
            Thread.Sleep(2000);
            serialPortForApp.Write(LoggedDataTOshow);
        }
    }
    catch (Exception)
    {
        ShowDataInScreenTxtb.Text = "TimeOUT Exception: Error for requested command";
    }
}

//button does not need DataRecieved handler to display but create conflict 
//for those that need it
private void GLPBtn_Click(object sender, EventArgs e)
{
    //send command to instrument
    string GLPCommand = "?G\r\n";
    string GLPToShow = String.Format(GLPCommand);

    try
    {
        if (serialPortForApp.IsOpen)
        {
            Thread.Sleep(2000);
            //write command to port
            serialPortForApp.Write(GLPToShow);
        }
    }
    catch
    {
        //MessageBox error if data reading is not posible
        ShowDataInScreenTxtb.Text = "TimeOUT Exception";
    }

    while (glpShowInMainForm.DataToSetandGet != "ENDS\r")
    {
        serialPortForApp.Write("\r");
        DataToSetandGet = serialPortForApp.ReadExisting();
        ShowDataInScreenTxtb.AppendText(DataToSetandGet.Replace("\r", "\r\n"));
    }
}


//event handler
private void SerialPortInApp_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    try
    {
        // SerialPort1_DataReceived handles to recieve data from device connected to Port
        Thread.Sleep(500);
        DataToSetandGet = serialPortForApp.ReadExisting();
        // Invokes the delegate on the UI thread, and sends the data that was received to the invoked method.  
        // ---- The "SerialPortInApp_DataReceived" method will be executed on the UI thread which allows populating of the textbox.  
        if (this.InvokeRequired)
        {
            Invoke(new MethodInvoker(delegate { 
                ShowDataInScreenTxtb.AppendText(DataToSetandGet.Replace("\r", "\r\n")); 
            }));
        }

        //The requested command is responded by the invoke method sending back the answer requested to display into the Textbox( DisplayDataTxB)
        ShowDataInScreenTxtb.AppendText(DataToSetandGet.Replace("\r", "\r\n"));

        //////display message(DataReadingStatusLbl) everytime data is retreiving from through the port 
        //   DataReadingStatusLbl.Text = "Retrieving Data from TPS Instrument -->>";
    }
    catch (Exception)
    {
        ShowDataInScreenTxtb.Text = "TimeOUT Exception: Error Port ";
    }
}

private void OpenPortBtn_Click(object sender, EventArgs e)
{
    //Connect Port Button allows to connect the current device base on Port and Raud settings
    try
    {
        if (PortIndexCbx.Text == "" || BaudRateIndexCbx.Text == "")
        {
            ShowDataInScreenTxtb.Text = "Set Up your Port Settings";                    
            //Error message to user to set up port connection if empty selection
        }
        else    
        {
            //Get Serial Port index settings to display for users 
            serialPortForApp.PortName = PortIndexCbx.Text;                       


            serialPortForApp.BaudRate = Convert.ToInt32(BaudRateIndexCbx.Text);      
            serialPortForApp.DataBits = 8;                                    
            serialPortForApp.Parity = Parity.None;                            
            serialPortForApp.StopBits = StopBits.One;                         
            serialPortForApp.Handshake = Handshake.XOnXOff;                   

            //Open serial Port to allow communication between PC and device 
            //DataReceived Implemented to read from Port sending and recieving the 
            buttons command requested
            //To receive data, we will need to create an EventHandler for the 
            // "SerialDataReceivedEventHandler"

            //I delete this and GLPBtn_Click responds and work without it, but I need 
            //both buttons to work because LoggedDataBtn_Click need this event to 
            //display responds

            serialPortForApp.DataReceived += new 
            SerialDataReceivedEventHandler(SerialPortInApp_DataReceived);

            serialPortForApp.ReadTimeout = 500;
            serialPortForApp.WriteTimeout = 500;

            //serialPortForApp.RtsEnable = true;
            //serialPortForApp.DtrEnable = true;

            //Once Serial port and baud rate setting are set, 
            //connection is ready to use 
            //Open serial port for communication between device and PC
            serialPortForApp.Open();

            //Connect and close connection buttons Behaviour
            progressBarPortAccess.Value = 100;                   
            OpenPortBtn.Enabled = false;                   
            ClosePortBtn.Enabled = true;                   
            ShowDataInScreenTxtb.Enabled = true;
            ShowDataInScreenTxtb.Text = "";

            DataReadingStatusLbl.Text = "Port is Connected";
        }
    }
    catch (UnauthorizedAccessException)
    {
        ShowDataInScreenTxtb.Text = "Unauthorized Port Access";
    }
}

//如何创建switch case或者定义按钮值不同阅读和展示。一些按钮与 datarecived 事件一起工作，而另一些按钮不需要它，但会为那些需要在 datarecieved 事件处理程序中进行 ReadExiting 的按钮创建冲突，例如我的 LoggedDataBtn_Click 其他按钮需要 ReadExisted 到 button_click 方法中，而不是像我的 GLPBtn_Click.

那样使用 datarecieved 事件

请问如何解决这个冲突谢谢

Answer 1

为了正确执行此操作，您确实需要一个状态机并在您的数据接收事件中委托（回调）运行根据您所处的状态正确的函数。在您的情况下，按gui 上的按钮可以将其置于某种状态。我在这里写得很好：

按钮发送命令 SerialPort1_DataReceived (EventArgs e) 发送和接收响应，与那些不需要它的人产生冲突

Buttons sent commands SerialPort1_DataReceived (EventArgs e)to send and receive responds,create conflict with those that don need it

c#

serial-port

read-write