How can I make sure only one WPF Window is open at a time?

Question

I have a WPF window that I am launching from inside of a winform app. I only want to allow once instance of that WPF window to be open at a time, and not warn that user if t

Answer 1

Here's something that's working for me.

    private About aboutWin;
    private void AboutOpenClicked(object sender, RoutedEventArgs e)
    {
       if(aboutWin == null)
       {
           aboutWin = new About();
           aboutWin.Closed += (a, b) => aboutWin = null;
           aboutWin.Show();
       }
       else
       {

           aboutWin.Show();  
       }

    }