Question

I have the following code:

        progressBar1.Minimum = 0;
        progressBar1.Maximum = Results.Count;

        foreach (MyClass cls in Results)
        {                
              progressBar1.Value += 1;

              // Go to DB and get large quantity of data
              cls.GetHistoryData();

        }

What I’d like to do is shift the processing to another thread so that progressBar1 updates correctly. I’ve found an article that implies that I should be able to use the Invoke method on the progress bar, but there doesn’t appear to be one.

Answer 1

If you bind the progressbar to a data property you do not need to switch the thread context manually. The WPF binding engine will do this automatically for you.

<ProgressBar Value={Binding Progress} />

And then in your thread:

foreach (MyClass cls in Results)
{                
      // databinding will automatically marshal to UI thread
      this.Progress++;
      cls.GetHistoryData();
}

In most cases this is much cleaner and less error prone than marshalling on your own using Dispatcher.Invoke or BackgroundWorker