What is the difference between options 1 and 2 in the following?
private void BGW_DoWork(object sender, DoWorkEventArgs e)
{
for (int i=1; i<=100; i++)
{
string txt = i.ToString();
if (Test_Check.Checked)
//OPTION 1
Test_BackgroundWorker.ReportProgress(i, txt);
else
//OPTION 2
this.Invoke((Action<int, string>)UpdateGUI, new object[] {i, txt});
}
}
private void BGW_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
UpdateGUI(e.ProgressPercentage, (string)e.UserState);
}
private void UpdateGUI(int percent, string txt)
{
Test_ProgressBar.Value = percent;
Test_RichTextBox.AppendText(txt + Environment.NewLine);
}
Looking at reflector, the Control.Invoke() appears to use:
this.FindMarshalingControl().MarshaledInvoke(this, method, args, 1);
whereas BackgroundWorker.Invoke() appears to use:
this.asyncOperation.Post(this.progressReporter, args);
(I'm just guessing these are the relevant function calls.) If I understand correctly, BGW Posts to the WinForms window its progress report request, whereas Control.Invoke uses a CLR mechanism to invoke on the right thread. Am I close? And if so, what are the repercussions of using either ?
Thanks
