How to catch the event of the window close button(red X button on window right top corner) in wpf form?

Question

How can I catch the event of the window close button(red X button on window right top corner) in a WPF form? We have got the closing event, window unloaded event also, but w

Answer 1

Try this:

        protected override void OnClosing(CancelEventArgs e)
        {
            this.Visibility = Visibility.Hidden;

            string msg = "Close or not?";
            MessageBoxResult result =
              MessageBox.Show(
                msg,
                "Warning",
                MessageBoxButton.YesNo,
                MessageBoxImage.Warning);
            if (result == MessageBoxResult.No)
            {
                // If user doesn't want to close, cancel closure
                e.Cancel = true;
            }
            else
            {
                e.Cancel = false;
            }
        }