Issue with Dispatcher in threads WPF

Question

I have a problem with threads and dispatcher in wpf, I created a thread which in certain cases bind class(wpf page control) to Main.MainContent.Content, only works the first time, then it doesn't work. I am a beginner in this topic, so I am asking for understanding and a thorough explanation. Let me add that I read a bit about DispatcherPriority Enum and tried to replace BeginInvoke with Invoke.

I want this thread to be executed every time, not just the first, after the first execution, when the program reaches the dispatcher it doesn't work. — Daniel2001k, Oct 05 '21 at 10:48
Check explanation between Invoke and BeginInvoke: https://stackoverflow.com/questions/19009174/dispatcher-invoke-vs-begininvoke-confusion — Auditive, Oct 05 '21 at 10:51
I checked again, added thread.sleep (1000) and checked begininvoke and invoke and still don't work — Daniel2001k, Oct 05 '21 at 11:07
Why are you invoking, while on the dispatcher thread it self? — Jeroen van Langen, Oct 05 '21 at 11:14
Please do not post images of code or errors. Include it in text with code formatting instead. — JonasH, Oct 05 '21 at 11:14
If you want to work from a thread, you have to prepare the data in classes and assign them later via a Dispatcher.Invoke — Jeroen van Langen, Oct 05 '21 at 11:18

score 0 · Answer 1 · answered Oct 05 '21 at 11:55

I solved my problem by changing one line:

MainWindow.Main.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() => { MainWindow.Main.MainContent.Content = new AcceptedPage(); }));

on:

Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() => { Application.Current.MainWindow.Content = new AcceptedPage(); }));

Issue with Dispatcher in threads WPF

1 Answers1