Who to Enable Alt + F4? I have handled a few keys and hence its not possible to exit my apllication using alt+F4!

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Hi,
I have been creating a Calculator in C# and it’s a WPF Application. I have enabled a few keys like numbers, addition key, multiplication key etc. As I have enabled few keys only, the user cannot exit the application using alt+F4. I have used PreviewKeyDown Even and I have handled other irrelevant keys. Is there a solution to enable alt+F4 ?
Thanks in advance.

Here is a piece of my code:

C#

private void Window_PreviewKeyDown(object sender, KeyEventArgs e)
        {

            switch (e.Key)
            {
                case Key.D0: Number0_Click(sender, e); break;
                case Key.D1: Number1_Click(sender, e); break;
                case Key.D2: Number2_Click(sender, e); break;
                .
                .
                .
                case Key.NumPad6: Number6_Click(sender, e); break;
                case Key.NumPad7: Number7_Click(sender, e); break;
                case Key.NumPad8: Number8_Click(sender, e); break;
                case Key.NumPad9: Number9_Click(sender, e); break;


                default:
                    e.Handled = true;
                    break;
            }

Posted 31-Mar-14 23:07pm

Sipherz

Updated 31-Mar-14 23:14pm

v2

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ArunRajendra · Accepted Answer · 2014-03-31T23:15:00

Solution 1

I don't know about WPF. I guess the issue is due to e.Handled = true; which blocks the event from executing the default behavior i.e. for Alt+F4 close the window.

Posted 31-Mar-14 23:15pm

ArunRajendra

OriginalGriff · Accepted Answer · 2014-03-31T23:16:00

Solution 2

Change the default code:

C#

default:
    e.Handled = false;
    break;

If you return true for everything you don't do anything with, none of those will ever work...

Posted 31-Mar-14 23:16pm

OriginalGriff