System could not hook for sleep and awake event by SystemEvents.PowerModeChanged in WinUI3 Desktop App

[gscheartA]

Describe the bug
I use SystemEvents hook API in App_Launched function for computer asleep hook. Here is my code

SystemEvents.PowerModeChanged += OnPowerChange;

private void OnPowerChange(object s, PowerModeChangedEventArgs e)
{
switch ( e.Mode )
{
case PowerModes.Resume:
break;
case PowerModes.Suspend:
break;
}
}

But it does not work after I let my computer sleep and asleep.

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Add the code above
2. Sleep and wake computer , the event could not be triggered

Expected behavior
The event could be detected.

Version Info

NuGet package version:
[WinUI 3 - Project Reunion 0.5: 0.5.0]

Windows app type:
Win32

OS:
October 2020 Update (19042)

Desktop

[ranjeshj]

@marb2000 @MikeHillberg This does not look like a WinUI3 issue. Should this go to reunion repo ?

[marb2000]

Agreed. It's an AppLifeCycle issue in Project Reunion.

[github-actions]

This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[juanmalm]

Same issue here

[cnbluefire]

The events of SystemEvents class cannot be raised because when the SystemEventInvokeInfo object captures the SynchronizationContext of the current thread, the SynchronizationContext.Send is called when RaiseEvent, and DispatcherQueueSynchronizationContext has not implemented the Send method.

Solution:

SystemEvents.InvokeOnEventsThread(() =>
{
    // No need to set, the default is null
    //SynchronizationContext.SetSynchronizationContext(null);

    SystemEvents.DisplaySettingsChanged += (s, a) =>
    {
        Debug.WriteLine("DisplaySettingsChanged");
    };
});

[alski]

The events of SystemEvents class cannot be raised because when the SystemEventInvokeInfo object captures the SynchronizationContext of the current thread, the SynchronizationContext.Send is called when RaiseEvent, and DispatcherQueueSynchronizationContext has not implemented the Send method.

Solution:

SystemEvents.InvokeOnEventsThread(() =>
{
    // No need to set, the default is null
    //SynchronizationContext.SetSynchronizationContext(null);

    SystemEvents.DisplaySettingsChanged += (s, a) =>
    {
        Debug.WriteLine("DisplaySettingsChanged");
    };
});

Works for me too.
microsoft/WindowsAppSDK#2630 does not.