Why does CachedFileManager.DeferUpdates(file) throw an exception when the file is located on a ONEDRIVE folder?

Groovykool 236

Example UWP Application
https://github.com/groovykool/CachedFileMangerTests.git

Groovykool 236 Reputation points

2023-06-05T16:32:31.11+00:00

Exception thrown: 'System.InvalidCastException'
David Lowndes 2,240 Reputation points MVP

2023-06-05T17:19:57.4866667+00:00

Does it make any difference if the file is fully downloaded locally, or not?
Groovykool 236 Reputation points

2023-06-05T17:41:31.5433333+00:00

I am using FileSavePicker. So the file was just saved on a local onedrive folder using PickSaveFileAsync.
Junjie Zhu - MSFT 14,136 Reputation points Microsoft Vendor

2023-06-06T03:13:39.7866667+00:00

Hi @Groovykool ,

Welcome to Microsoft Q&A!

Could you please provide your Windows system specifications? This problem seems to be related to the system version. I tested in win11 and win10, the code works in win10, and your problem can be reproduced in win11.
maxvella 10 Reputation points

2023-06-06T06:27:04.84+00:00

I have the exact same problem. No issue on Win10 crashes on Win11.
Groovykool 236 Reputation points

2023-06-06T16:45:06.9833333+00:00

Edition Windows 11 Pro

Version 22H2

Installed on ‎3/‎8/‎2023

OS build 22621.1702

Experience Windows Feature Experience Pack 1000.22641.1000.0
Junjie Zhu - MSFT 14,136 Reputation points Microsoft Vendor

2023-06-07T08:18:38.3533333+00:00

This is unexpected behavior, if this is not an emergency, you can submit it through the Feedback Hub.

If you want a quick response, you can request paid technical support. You will get 1:1 support on that. Select Developer Tools -> Windows UWP Development -> Windows 10 Universal App Dev ->System Services Development -> Files and folders API in the support page and you could contact the team. Please kindly note that your support ticket will be free if it is Microsoft's issue.
maxvella 10 Reputation points

2023-06-08T15:37:51.35+00:00

Windows 11 Pro

22H2

07/‎02/‎2023

22621.1778

Windows Feature Experience Pack 1000.22642.1000.0

This is my system. Crashes started after I upgraded to 22H2.

1 answer

Matthias 0 Reputation points

2023-10-20T18:01:23.25+00:00
@Junjie Zhu - MSFT

Hello I face the same problem. I am the application developer and I do not know what I could do more than contact you here. Documentation of the method CachedFileManager.DeferUpdates(file) does not specify it could throw any exception.

Users under Windows 10, does not experience any issues.

Tests with Windows 11 (22621.2428) and OneDrive (23.199.0924.0001 (64-bit)):

Exception happens when OneDrive is on, when OneDrive is paused or OneDrive program is closed.

Exception does not happen on any location that is not configured with OneDrive sync. (Tested user directories, SD card locations, other hard drive).

Tests with Windows 11 (25967.1010) and OneDrive (23.211.1010.0001 (64-bit)):

Exception does not happen when OneDrive is on, when OneDrive is paused or OneDrive program is closed.

Exception does not happen on any location that is not configured with OneDrive sync. (Tested user directories, SD card locations, other hard drive).

I wanted to post comment, but made answer by mistake. It looks like the preview version of Windows 11 or OneDrive contains the improve for the problem. Any idea what it is and when it will be released to the users?
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Groovykool 236 Reputation points

2023-10-20T21:07:13.87+00:00

The only safe solution is to not use Deferupdates. Since Microsoft introduced this bug and does not test for it, any changes to the OS could make an app incompatible with OneDrive.
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