Calling ShowDialog in BackgroundWorker

Question

I have a WinForms application in which my background worker is doing a sync task, adding new files, removing old ones etc.

In my background worker code I want to sho

Answer 1

I usually create a method to execute a delegate on the UI thread:

  private void DoOnUIThread(MethodInvoker d) {
     if (this.InvokeRequired) { this.Invoke(d); } else { d(); }
  }

With this, you can change your code to:

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
   DialogResult result = DialogResult.No;
   DoOnUIThread(delegate() {
      MyForm f = new MyForm();
      f.FilesToAddDelete(..);
      result = f.ShowDialog();
   });

   if(No...)
   return;
   else
   //keep working...
}