Question

If I use Application.LoadComponent() to load a UserControl, Page or Window, my application freezes when I try to close it.

The app apparently closes, but the process keeps running. Easy to notice when debugging.

I’ve tested it under Windows 7 64bit and Vista 32bit. In both cases I have used VS2008 and .NET 3.5.

A repro can be built by creating a wpf application as follows:

    public partial class Window1 : Window {
        public Window1() {
            InitializeComponent();
        }
        public void LoadCopy() {
            var uri = new Uri("/WpfApplication1;component/window1.xaml", UriKind.Relative);
            var copy = (Window)Application.LoadComponent(uri);
            MessageBox.Show(copy.Title);
        }
        private void Button_Click(object sender, EventArgs e) {
            LoadCopy();
        }
    }

Does anyone know what might be happening? And how to solve it?

Answer 1

Try assigning the owner to the created assembly i.e.

copy.Owner = this;

I was able to close your example after doing this.