AcManager.Pages.Windows.MainWindow.OnUnloaded C# (CSharp) Method

        private void OnUnloaded(object sender, RoutedEventArgs e) {
            if (!_loaded) return;
            _loaded = false;

            FancyBackgroundManager.Instance.RemoveListener(this);
            AboutHelper.Instance.PropertyChanged -= About_PropertyChanged;

            if (_hook == null) return;

            try {
                HwndSource.FromHwnd(new WindowInteropHelper(this).Handle)?.RemoveHook(_hook);
            } catch (Exception) {
                Logging.Warning("Can’t remove one-instance hook");
            }

            _hook = null;
        }