Exception when attempting to show window after closing it via title bar

Describe the bug

When running H.NotifyIcon.Apps.WinUI, after closing the window via the X icon in the title bar, attempting to show the window via the taskbar icon results in an exception.

Specifically, System.Runtime.InteropServices.COMException: 'The operation identifier is not valid. (0x800710DD)' when accessing window.Visible in ShowHideWindowCommand_ExecuteRequested.

Steps to reproduce the bug

1. Run H.NotifyIcon.Apps.WinUI
2. Close the window via the title bar X icon
3. Left click the taskbar icon or right click and select “show/hide window”
4. Exception occurs

Expected behavior

The window should appear.

Screenshots

NuGet package version

No response

Platform

WinUI

IDE

Visual Studio 2022

Windows Version

Windows 11

WindowsAppSDK Version

1.2

WindowsAppSDK Type

Packaged

Manifest

No response

Additional context

No response

[JasonWei512]

@myfix16

MainWindow.Closed += MainWindow_Closed;

private void MainWindow_Closed(object sender, WindowEventArgs args)
{
    args.Handled = true;
}

[JasonWei512]

Use a DispatcherQueue to execute UI related code on the main UI thread. Otherwise you may get an exception.

I recommend using the CommunityToolkit.WinUI nuget package’s DispatcherQueueExtensions.EnqueueAsync.

using CommunityToolkit.WinUI;

class MyClass
{
    // Get a DispatcherQueue instance for later use. This has to be called on the UI thread,
    // but it can then be cached for later use and accessed from a background thread as well.
    private readonly DispatcherQueue dispatcherQueue = DispatcherQueue.GetForCurrentThread();

    // ...

    // Your tray icon event handler. This may not be called from the main UI thread
    private async void ExitApplicationCommand_ExecuteRequested(object? sender, EventArgs args)
    {
        // Execute some code on the target dispatcher queue
        await dispatcherQueue.EnqueueAsync(() =>
        {
            if (App.MainWindow.Visible)
            {
                // ...
            }
        });
    }
}