调用委托（方法）

Question

I got some code that uses a delegate to pass the percentage of the operation. But the delegate method is run on the same thread as the operation, which is a backgroundworker. So updating a progressbar in the delegate method is impossible without invocation.

Should I just invoke in the delegate method or is there a better way? I didn't really understand the example that is on msdn (it was in vb.net too which made it harder :/).

Answer 1

You could add something along the lines of the below to the form containing the progress bar. This will check to see if an invoke is required.

public void SetProgressValue(int value)
{
    if (this.ProgressBar.InvokeRequired)
    {
       this.BeginInvoke(new Action<int>(SetProgressValue), value);
       return;
    }
    this.ProgressBar.Value= value;
}

Answer 2

Dispatcher.BeginInvoke（（Action）（）=> YourDelegate（））;