如何通过C＃将Modbus RTU设备中的数据更新为Form

Question

我想更新从寄存器Modbus设备读取的值，然后每秒钟显示在Windows窗体上，这是我由C＃编写的代码

    private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            RTU2();
        }
        catch (Exception ex)
        {

           MessageBox.Show(ex.StackTrace, "Error");
        }

    //    Console.ReadKey();
    }
    public  void RTU2()
    {

        using (SerialPort port = new SerialPort("COM7"))
        {

            ThreadPool.QueueUserWorkItem(new WaitCallback((obj) =>
            {

                // configure serial port
                port.BaudRate = 19200;
                port.DataBits = 8;
                port.Parity = Parity.None;
                port.StopBits = StopBits.One;
                port.Open();
                while (true)
                {
                    {
                        // create modbus master
                        ModbusSerialMaster master = ModbusSerialMaster.CreateRtu(port);

                        byte slaveId = 1;
                        int startua1 = int.Parse(txtUA1.Text.Trim(), System.Globalization.NumberStyles.HexNumber);
                        ushort startAddressua1 = (ushort)startua1;

                        // read large value in two 16 bit chunks and perform conversion
                        Thread.Sleep(100); // Delay 100ms
                        ushort[] registersua = master.ReadHoldingRegisters(slaveId, startAddressua1, 2);



                        float UAV = (float)(decimal)valueua / 100000;

                        //DISPLAY VALUE ON FORM
                        UA.Text = UAV.ToString("###,###.00");//'Cross-thread operation not valid: Control 'UA' accessed from a thread other than the thread it was created on.'


                        Thread.Sleep(2000); // Delay 20ms
                    }
                }

            }));

        }

但是，这是错误的。

[请帮助我，我应该如何修改该代码以使其运行良好，谢谢]

Answer 1

[似乎UA是一个控件，并且您试图在UA.Text中的非UI线程中修改ThreadPool。

要实现这一点，请将您的值保存在m_szUAV中，并在System.Windows.Forms.Timer的Tick事件中将m_szUAV更新为UA.Text。

    System.Windows.Forms.Timer timer;
    public Form1()
    {
        // Constructor's original code 
        InitializeComponent();

        // Initial your timer
        timer = new System.Windows.Forms.Timer();
        timer.Interval = 50;
        timer.Tick += Timer_Tick;
    }

    string m_szUAV = string.Empty;

    public  void RTU2()
    {
        // your code of modbus here
        // I do not post it again.

        float UAV = (float)(decimal)valueua / 100000;

        //Save value to private member.
        m_szUAV = UAV.ToString("###,###.00");
    }

    private void Timer_Tick( object sender, EventArgs e )
    {
        UA.Text = m_szUAV;
    }