在创建 window 句柄之前，无法在控件上调用 c# Invoke 或 BeginInvoke System.Threading.Thread

Question

not very expert of Threading under Windows. I have a Main WinForm that opens a child form in it's ctor.

public partial class Main : Form
{
    public Main()
    {
        InitializeComponent();

        ImgRxUI formStart = new ImgRxUI();
        formStart.MdiParent = this;
        formStart.WindowState = FormWindowState.Maximized;
        formStart.Show();
    }

etc..

The ImgRxUI Form (child form) starts a Thread passing to 2 Actions (delegates in simple form).

 public partial class ImgRxUI : Form
{

    private ImgReceiver oImgReceiver = null;

    public ImgRxUI()
    {
        InitializeComponent();

        this.WindowState = FormWindowState.Maximized;
        this.ShowIcon = false;

        oImgReceiver = new ImgReceiver(UpdateImage, Log);
        oImgReceiver.startService();

    }



    public void UpdateImage(byte[] ProtocolType)
    {
       ...do stuff...

    }

    public void Log(string Text)
    {
        this.Invoke((MethodInvoker)delegate
        {
            LogMethod(Text);
            tLog.ScrollToCaret();
        });

    }

    private void LogMethod(string Text)
    {
        tLog.AppendText(Text + Environment.NewLine);
    }

The ImgReceiver as I said starts a thread that listens on a socket...

 public class ImgReceiver
{

    private Action<byte[]> ImgReceived;
    private Action<string> Log;
    private System.Threading.Thread Thread_ImgReceiver = null;

    public ImgReceiver(Action<byte[]> ImageReceivedDelegate, Action<string> LogDelegate)
    {
        
        this.ImgReceived = ImageReceivedDelegate;
        this.Log = LogDelegate;
    }

    public void startService()
    {
        Thread_ImgReceiver = new System.Threading.Thread(startListening);
        Thread_ImgReceiver.IsBackground = true;
        Thread_ImgReceiver.Start();
    }

    [SecurityPermissionAttribute(SecurityAction.Demand, ControlThread = true)]
    public void killService()
    {
        Thread_ImgReceiver.Abort();
        System.Threading.Thread.Sleep(1000);
    }

    public void startListening()
    { ...do stuff...}

When I close the ImgRxUI form the following event on the form itself gets called

 private void ImgRxUI_FormClosing(object sender, FormClosingEventArgs e)
    {
        oImgReceiver.killService();            
    }

Hear rises the error in the title.

Wht?

Thaks

Answer 1

Change the kill Service method to

[SecurityPermissionAttribute(SecurityAction.Demand, ControlThread = true)]
public void killService(Action action)
{
   action.Invoke();
   System.Threading.Thread.Sleep(1000);
}

Change the access level Thread_ImgReceiver to public

public System.Threading.Thread Thread_ImgReceiver = null;

and call killService to

private void ImgRxUI_FormClosing(object sender, FormClosingEventArgs e)
{  
    oImgReceiver.killService(new Action(delegate { oImgReceiver.Thread_ImgReceiver.Abort(); }));
}