How do I hide the parent window when I call ShowDialog for other window in WPF.

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In WPF Application one window call ShowDialog for other and other. And I see all window chain. When I hide the calling window before I show other - ShowDialog returns when Visibility = System.Windows.Visibility.Visible. For all windows I added this.Closed += Window_Closed; for show previous window

C#

void Window_Closed(object sender, EventArgs e)
{
    if (Owner != null)
    {
            Owner.Visibility = System.Windows.Visibility.Visible;
    }
}

and before call ShowDialog I hide the active window
{
this.Visibility = System.Windows.Visibility.Collapsed;
CustomerData maCreateCD = new CustomerData();
maCreateCD.Owner = this;
maCreateCD.ShowDialog();
}
This operation repeated for other windows and all OK. I see only last window. But when I call Close() in last window I see that maCreateCD.ShowDialog(); is returned and for other windows ShowDialog is returned. And only after this the Visibility property for window called before last is set to Visible and window shows.
In MSDN ShowDialog is returned only after window closing but this does not work. I see that ShowDialog is returned and window does not closed.

Posted 11-Nov-14 3:32am

edtrojan

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Philippe Mori 11-Nov-14 20:55pm

Usually, you don't hide modal Windows nor owner Windows.

edtrojan 12-Nov-14 1:44am

In WPF for windows chain (ShowDialog -> ShowDialog -> ShowDialog -> ShowDialog) I can see all modal windows but I want to see only last dialog.

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Philippe Mori · Answer 1 · 2014-11-12T02:29:00

Instead of showing next dialog from the previous one, a much better alternative would be to close the dialog first and then show next dialog. Something like :

C#

var result = dialog1.ShowDialog();
if (some_conditions)
{
  var result2 = dialog2.ShowDialog();
}
if (some_other_conditions)
{
  var result3 = dialog3.ShowDialog();
}
if (some_final_conditions)
{
  var result4 = dialog4.ShowDialog();
}

I would say that each dialog would use the main window as their owner. Thus doing it that way, it might be possible to first close the old dialog and show the new one from the same event handler.

I can say that modal dialog are not designed to be hidden. This scenario is af far as I understand not supported and thus will not behave well. A modal dialog is designed to be shown until its end and after that the code continue at the caller location just after the call of ShowDialog.

Many things ca goes wrong if you try to make a workaround. In particular, enabling, flickering, taskbar buttons, focus might not bahave correctly and thus the application won't work well with the system. Avoid hiding modal Windows.

Alternatively, if it is a wizard, then you should simply show a user control for each page Inside the same dialog.