Avalonia 取消窗口关闭导致 Linux 麒麟系统无法关机注销重启

public partial class MainWindow : Window
{
    protected override void OnClosing(WindowClosingEventArgs e)
    {
        e.Cancel = true;
        base.OnClosing(e);
    }

    ... // 忽略其他代码
}

public partial class MainWindow : Window
{
    protected override void OnClosing(WindowClosingEventArgs e)
    {
        if (e.CloseReason is WindowCloseReason.ApplicationShutdown or WindowCloseReason.OSShutdown)
        {
            // 应用关闭或操作系统关闭时，允许关闭窗口
            // 为什么需要判断 ApplicationShutdown 而不是只判断 OSShutdown 呢？这是因为在 11.3.1 及以前版本，在 Avalonia 底层挖了一个坑，无法区分原因。我将此问题报告给官方，详细请看
            // [Incorrect WindowCloseReason Passed During System Shutdown in Avalonia · Issue #19027 · AvaloniaUI/Avalonia](https://github.com/AvaloniaUI/Avalonia/issues/19027 )
        }
        else
        {
            e.Cancel = true;
        }

        base.OnClosing(e);
    }

    ... // 忽略其他代码
}

        private bool DoShutdown(
            ShutdownRequestedEventArgs e,
            bool isProgrammatic,
            bool force = false,
            int exitCode = 0)
        {
            if (!force)
            {
                ShutdownRequested?.Invoke(this, e);

                if (e.Cancel)
                    return false;

                if (_isShuttingDown)
                    throw new InvalidOperationException("Application is already shutting down.");
            }

            _exitCode = exitCode;
            _isShuttingDown = true;
            var shutdownCancelled = false;

            try
            {
                // When an OS shutdown request is received, try to close all non-owned windows. Windows can cancel
                // shutdown by setting e.Cancel = true in the Closing event. Owned windows will be shutdown by their
                // owners.
                foreach (var w in new List<Window>(_windows))
                {
                    if (w.Owner is null)
                    {
                        var ignoreCancel = force || (ShutdownMode == ShutdownMode.OnMainWindowClose && w != MainWindow);
                        w.CloseCore(WindowCloseReason.ApplicationShutdown, isProgrammatic, ignoreCancel);
                    }
                }

                if (!force && Windows.Count > 0)
                {
                    e.Cancel = true; // 核心阻止关闭的代码
                    shutdownCancelled = true;
                    return false;
                }

                var args = new ControlledApplicationLifetimeExitEventArgs(exitCode);
                Exit?.Invoke(this, args);
                _exitCode = args.ApplicationExitCode;
            }
            finally
            {
                _isShuttingDown = false;

                if (!shutdownCancelled)
                {
                    _cts?.Cancel();
                    _cts = null;
                    Dispatcher.UIThread.InvokeShutdown();
                }
            }

            return true;
        }

                var e = new ShutdownRequestedEventArgs();

                if (_platform.Options.EnableSessionManagement)
                {
                    ShutdownRequested?.Invoke(this, e);
                }

                SMLib.SmcInteractDone(smcConn, e.Cancel);

                if (e.Cancel)
                {
                    return;
                }

                _saveYourselfPhase = false;

                SMLib.SmcSaveYourselfDone(smcConn, true);

void SmcInteractDone(SmcConn smc_conn, Bool cancel_shutdown);