wpf c# status window update

Question

Hello

I am trying to create a status window which content(textbox) should change in a lengthy operation. This status window is called and updated from the main application. Unfortunately, the content is updated only at the finish of the operation. I am using VS2008, C# and WPF.

Thank you.

Answer 1

If you are calling a service and the call is synchronous, the main application does not get any chance to update. You need to put them on a different thread. Also, if the service call is getting a higher priority (UI threads are always of less priority), you need to forcibly tell the system to update these.

Answer 2

How about doing the lengthy operation in a BackgroundWorker thread and notifying the content every once in a while by using the Dispatcher? It will give a responsive yet progressive feeling to your UI.

Answer 3

This is in another answer to allow better formatting:

The code should like pretty much like this:

BackgroundWorker bgWorker = new BackgroundWorker();

bgWorker.DoWork += new DoWorkEventHandler(bgWorker_DoWork);

bgWorker.RunWorkerCompleted += new 
    RunWorkerCompletedEventHandler(bgWorker_RunWorkerCompleted);

bgWorker.RunWorkerAsync();

In the bgWorker_DoWork method, call "Dispatcher.Invoke" (or "Dispatcher.BeginInvoke", depends on the circumstances) and the delegate for the invoke may update your textbox (because it's in the same thread as the textbox).