GetFoldersAsync gives exception in an AppData subfolder in Windows 2004

Jos Huybrighs 336

I have a strange problem with my UWP DesktopBridge app where GetFoldersAsync called with a StorageFolder that is set to a subfolder in AppData/Local returns an exception "Value does not fall within the expected range". The StorageFolder is setup through a folder picker and the GetFoldersAsync call is simply to list all subfolders.
The error does not occur on Windows 1909 but comes up on Windows 2004, and (not fully tested) only for folders inside AppData.

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2020-10-13T13:19:37.71+00:00

could you share the complete folder path or post your code below?
Jos Huybrighs 336 Reputation points

2020-10-13T13:30:48.037+00:00
This is the code (it is very hard to do something wrong with this):

IReadOnlyList<StorageFolder> folderList = await selectedFolder.GetFoldersAsync();

and selectedFolder is obtained using:

var folderPicker = new Windows.Storage.Pickers.FolderPicker(); folderPicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.DocumentsLibrary; folderPicker.FileTypeFilter.Add("*"); var selectedFolder = await folderPicker.PickSingleFolderAsync();

I understand that you want to ask this but, again: this is code that runs already 2 years (the app is on the Windows Store) and ONLY fails on Windows 10 release 2004. The same version of my app running on 1909 doesn't give this error.
And: ONLY on AppData.
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2020-10-13T13:33:48.923+00:00

Ok, I got it, and please share the folder that you have picked, I will try to reproduce this.
Jos Huybrighs 336 Reputation points

2020-10-13T13:36:41.4+00:00

You should know that this is impossible!
It is the AppData folder on my computer!

Also: broadFileSystemAccess is NOT configured in the app.

I have tested it in the mean time on 4 computers: 3 of them running 2004 have the error, 1 running 1909 doesn't has the error.
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2020-10-13T13:37:51.67+00:00

Ok, I'm making code sample, please wait a moment.
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2020-10-13T13:41:27.577+00:00

You mentioned your app is desktop-bridge app, please tell the detail about desktop client, wpf or winforms and net framewrok version.
Jos Huybrighs 336 Reputation points

2020-10-13T13:52:26.233+00:00

The app is a desktop bridge app with the client (entry point) being a UWP app. The exception occurs in the UI of the UWP app where the user must select a folder. The app then shows all subfolders of the selected folder.
In this particular case the user selects a folder from the AppData directory tree, e.g. AppData/Local/Microsoft/Edge.

The app is SyncFolder which is a sync/backup app. The desktop bridge is because the actual copying must be done by a win32 process. This proces of course isn't running at the moment the error occurs.

Most users never select a folder from AppData for sync/backup but of course they can if they want to.

The UWP app has version 1903 as target and version 1809 as minimum version.
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2020-10-13T14:04:11.603+00:00

Ok, I could reproduce your problem and it could be also reproduced in 1909. I will report this with team. If I have any updates I will update below.
wenhx 1 Reputation point

2020-11-17T16:40:05.127+00:00

I have encountered the same problem. Is there a solution to this problem?

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GetFoldersAsync gives exception in an AppData subfolder in Windows 2004

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