WinUI 3 Read access conflict

[Gaoyifei1011]

Describe the bug

当应用窗口关闭时，会触发 Activated 事件，在此时访问 SystemBackdrop 时会提示读取访问权限冲突。

When the application window is closed, the Activated event is triggered. Against the SystemBackdrop, access conflict is prompted.

Steps to reproduce the bug

See describe

Expected behavior

The window is closed normally, and no access conflict is displayed

Screenshots

NuGet package version

WinUI 3 - Windows App SDK 1.4.3: 1.4.231115000

Windows version

Windows 11 (22H2): Build 22621

Additional context

None

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Closed similar issues:

• Access Violation in WinUI 3 (#7695), similarity score: 0.80

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[DarranRowe]

It is important to remember that the WM_ACTIVATE window message, and by extension the Window.Activated event, is used to indicate when the window is activated and deactivated. What this means is that, surprising as it is, the underlying HWND will get a WM_ACTIVATE with WA_INACTIVE when you close a window. It is therefore no surprise to find that the Xaml runtime filters this through and triggers the Activated event one last time. If you check the WindowActivatedEventArgs.WindowActivationState property, is this properly being set as WindowActivativationState.Deactivated? If it is then you are just getting caught out by this, and you probably need to use some other means, like AppWindow.Closing to not allow any problematic code to run.

[Gaoyifei1011]

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 7 days. It will be closed if no further activity occurs within 7 days of this comment.

Please provide a relatively good solution