CODEWITHSUNDEEP
c#wpfbuttondialog
Loc Dai Le
Loc Dai Le

Reputation: 1697

How to not open multiple windows in WPF

In my WPF application I use this code to open a new windows from a button:

private void LoginBtn_Click(object sender, RoutedEventArgs e)
{
    LoginDialog dialog = new LoginDialog();
    dialog.Show();    
}

But when there is already a LoginDialog open and I click the LoginBtn again it open a new LoginDialog windows. How do I code it so it override the previous one that is open, if any.

Upvotes: 1

Views: 793

Answers (4)

Clay Ver Valen
Clay Ver Valen

Reputation: 1073

private void LoginBtn_Click(object sender, RoutedEventArgs e)
{
    LoginDialog _dialog = Application.Current.Windows.OfType<LoginDialog>().FirstOrDefault() ?? new LoginDialog();
    _dialog.Show();
}

Upvotes: 3

Muds
Muds

Reputation: 4116

You can create a local variable of type Login dialog and check if its null

LoginDialog _dialog;

private void LoginBtn_Click(object sender, RoutedEventArgs e)
{
    if(_dialog == null)
    {
        _dialog = new LoginDialog();
     }
    _dialog.Show();    
}

Upvotes: 3

Ryan Searle
Ryan Searle

Reputation: 1627

You may not be able to use this due to design restrictions however you could open the new window so that it disables the others.

private void LoginBtn_Click(object sender, RoutedEventArgs e)
{
    LoginDialog dialog = new LoginDialog();
    dialog.ShowDialog();    
}

Upvotes: 0

PMF
PMF

Reputation: 17238

Use ShowDialog() instead of Show() to make the dialog modal (so that you cannot do anything else while the dialog is open).

That also allows you to get the return value, indicating whether the user (i.e.) pressed cancel or ok.

Upvotes: 0

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