Well this question and this question are similar but no answers that work. In fact I was hoping WindowStartupLocation=CenterOwner would work...it doesn't. It seems to center the new window in the center of a grid column, not the center of the main window. So I'm assuming it thinks that is the parent. Second when I close the dialog and open it again it is not centered but moved down and right from the previous position. And if I move the main window to a second monitor the popup still opens on the default monitor. Are these properties wrong or am I just thinking it should work in a different way. I suppose I could calculate the Top and Left properties manually. I just want the popup to be centered in the main window no matter where it is.
5 Answers
In addition, we can use:
this.Owner = App.Current.MainWindow;
Or Application instead of App.
And place it in a child window constructor:
public partial class ChildWindow : Window
{
public ChildWindow()
{
InitializeComponent();
DataContext = new ChildWindowViewModel();
this.Owner = App.Current.MainWindow;
}
}
Something else that can cause this is setting DataContext after InitializeComponent() is called.
If you have code-behind like this:
public CustomWindow(CustomViewModel viewModel)
{
InitializeComponent();
DataContext = viewModel;
}
Change it to:
public CustomWindow(CustomViewModel viewModel)
{
DataContext = viewModel;
InitializeComponent();
}
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