How to avoid window freeze issue while using fileopenpicker in winui 3?

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I am using FileOpenPicker to select the file for that i am initializing with the mainwindow handle by using this API WinRT.Interop.InitializeWithWindow.Initialize
but after closing the FileOpenPicker the mainwindow got freezes to retrieve the normal state I need to move the mouse in to the tittle bar of my application or taskbar.

What I have tried:

 var parentWindow = FindWindow(null,"MyAppTittle");
 var openPicker = new Windows.Storage.Pickers.FileOpenPicker();
                openPicker.FileTypeFilter.Add(".jpg");
                openPicker.FileTypeFilter.Add(".bmp")
 WinRT.Interop.InitializeWithWindow.Initialize(openPicker, parentWindow); //Initilaize 
StorageFile imageFile = await openPicker.PickSingleFileAsync();
if (imageFile == null) return;

Posted 5-Apr-23 22:34pm

Fazil13

Updated 6-Apr-23 4:22am

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Member 15627495 6-Apr-23 5:23am

you have to handle few threads. MTA
the main window thread is too busy, then it freeze.
it's a 'busy state' of your main Windows, not a bug.

Fazil13 6-Apr-23 5:36am

how to do that can u provide some sample please

Member 15627495 6-Apr-23 6:13am

threads are 'processing units'
they could be STA or MTA ( Single Thread .. or Mulitple Thread built )

any App is loaded into a Thread.
to empower your Apps, you can use more than one Thread.

Thread can be created , used, and destroy and are dedicated to execute codes aside the Main Thread.
link : https://learn.microsoft.com/en-us/dotnet/api/system.threading.thread?view=net-7.0

Richard MacCutchan 6-Apr-23 10:53am

Nothing to do with the question. Did you get this answer from ChatGPT?

Member 15627495 6-Apr-23 10:58am

I wait for your solutions Richard MacCutchan

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Gerry Schmitz · Answer 1 · 2023-04-06T04:22:00

Solution 1

You're mixing Windows RT and WPF. You have a hack that is apparently "just working" (async interop). Stick to what is "typical".

The OpenFileDialog - The complete WPF tutorial[^]

Posted 6-Apr-23 4:22am

Gerry Schmitz