Raising event after Parallel.For completes job

After pressing button following function is called.

Task.Factory.StartNew(() => 
{ 
    Parallel.For(0, cyclesCount, i => DoWork(i));

    if (OnJobCompleted != null)
        OnJobCompleted(this, EventArgs.Empty);                
});

Further in code there is

void ladder_OnJobCompleted(object sender, EventArgs args)
{
    txbDebug.Text = "completed";
}

I know

开发者_开发技巧txbDebug.Text = "completed";

has to be Invoked, beacause I'm raising event on different thread. But I can't figure out, how to Invoke it. This event is situated in wpf form.

Use the Dispatcher

txbDebug.Dispatcher.Invoke(new Action(() =>
{
    txbDebug.Text = "completed";
}));

I do not expect you to want to use the new Async CTP, but if you are curious how this would be done with the new async and await keywords proposed for C# 5 then consider the following example. It really does not get any more elegant than this.

void async YourButton_Click(object sender, RoutedEventArgs args)
{
  txbDebug.Text = await Task<string>.Factory.StartNew(
    () =>
    {
      Parallel.For(0, cyclesCount, i => DoWork(i));
      return "complete";
    });
}