The FileOpenPicker's method PickSingleFileAsync throws ComException

[alexdi220]

Describe the bug
Hi, just tried to pick an image but got an exception - System.Runtime.InteropServices.COMException: 'Invalid window handle. (0x80070578)' To reproduce try the following code.

Steps to reproduce the bug

            FileOpenPicker filePicker = new FileOpenPicker();
            foreach(string ext in new []{ ".jpeg", ".jpg", ".png", ".bmp" }) 
                filePicker.FileTypeFilter.Add(ext);
            
            filePicker.ViewMode = PickerViewMode.Thumbnail;
            filePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
            filePicker.SettingsIdentifier = "ImageFilePicker";
            filePicker.CommitButtonText = "Insert";

            StorageFile file = await filePicker.PickSingleFileAsync(); //throws exception

Expected behavior

Screenshots

Version Info

NuGet package version:

[WinUI 3 - Project Reunion 0.5: 0.5.7]

Windows app type:

UWP	Win32
	Yes

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
October 2020 Update (19042)
May 2020 Update (19041)	Yes
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox
Surface Hub
IoT

Additional context

[jaigak]

You need to cast the picker to IInitializeWithWindow and call it's Initialize with the window handle to use it in a desktop app.

[Marv51]

See #2716

[StephenLPeters]

https://docs.microsoft.com/en-us/uwp/api/windows.storage.pickers.fileopenpicker.-ctor?view=winrt-19041#remarks

[alexdi220]

Thanks all for the answers. But it still looks like a bug. The WA is ok but believe should be fixed in the future versions.