Question

I tried creating one, but the BackgroundWorker in Window1 couldn’t access the ProgressBar in Window2 once the reportProgress was activated, because “The calling thread cannot access this object because a different thread owns it”.

Seems there’s a lower level thread model I could use, but it also seems a lot more complicated.

Answer 1

You just need to get the ProgressBar disptacher.

You can access the ProgressBar with:

Window2.prograssbar.Dispatcher.Invoke(
    () => /*the code for modifying the progressbar*/ );