WPF : How to set a Dialog position to show at the center of the application?

Question

How to set Dialog's position that came from .ShowDialog(); to show at the center of the mainWindows.

This is the way I try to set position.

private void Window_Loaded(object sender, RoutedEventArgs e) {             PresentationSource source = PresentationSource.FromVisual(this);     if (source != null)     {         Left = ??         Top = ??     } } 

Answer 1

In the XAML belonging to the Dialog:

<Window ... WindowStartupLocation="CenterOwner"> 

and in C# when you instantiate the Dialog:

MyDlg dlg = new MyDlg(); dlg.Owner = this;  if (dlg.ShowDialog() == true) {     ... 

Answer 2

I think it's easier to use xaml markup

<Window WindowStartupLocation="CenterOwner">