WPF keydown not capturing escape?

Question

xaml file

PreviewKeyDown="Window_KeyDown"

.cs file

private void Window_KeyDown(object sender, KeyEventArgs e)
{
    System.Windows.Forms.MessageBox.Show(e.Key.ToString());
    if (e.Key == Key.Escape)
    {
        this.Close();
    }
}

KeyPreview is set to true, although the message box doesn't appear for the ESC key. (the message box does show for other "normal" keys such as 0-9 and a-z). How would I fix this or find a way to trigger something on ESC?

EDIT

Win.xaml

<Window x:Class="WindowsFormsApplication5.Win"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         WindowStyle="None" 
         PreviewKeyDown="Window_KeyDown">
</Window>

Win.xaml.cs

public partial class Win : Window
{
    public Win()
    {
        InitializeComponent();
    }

    private void Window_KeyDown(object sender, KeyEventArgs e)
    {
        System.Windows.MessageBox.Show(e.Key.ToString());
        if (e.Key == Key.Escape)
        {
            this.Close();
        }
    }
}

Form1.cs

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Win scrn = new Win();
        scrn.Show();
    }
}

Hopefully this should clear up any issues, sorry for being unclear about this.

Duplicate question, already answered in: http://stackoverflow.com/questions/7691713/how-to-close-a-window-in-wpf-on-a-escape-key — Alexander Bell, Mar 06 '16 at 15:09
I don't know, simplest way I knew of displaying a popup message, is this really relevant? — user1768788, Mar 06 '16 at 15:09
Where do you have that `PreviewKeyDown` event attached to? To your window? Then it should work; and it does work for me. Unless you have another handler that consumes the key event and cancels it. — poke, Mar 06 '16 at 15:12
Works for me..can you reproduce this issue in a simple wpf application ? — Rohit, Mar 06 '16 at 15:13
Just throwing in some Form1 code does not clear up issues. Voting to close. — paparazzo, Mar 06 '16 at 15:54
@Frisbee I made a new project, entered the code in here to the separate files. No more code is used and I get the exact same problem, very easy to reproduce, I'm sorry if this isn't enough information, but really; it should be. — user1768788, Mar 06 '16 at 15:58
Not problem solution but Visual Studio solution (the project files and stuff) — poke, Mar 07 '16 at 08:27
Possible duplicate of [How to Close a Window in WPF on a escape key](https://stackoverflow.com/questions/7691713/how-to-close-a-window-in-wpf-on-a-escape-key) — Eldho, May 22 '18 at 08:35

score 0 · Answer 1 · answered Mar 06 '16 at 15:31

Maybe WPF MessageBox is relevant

This works just fine for me

<Window PreviewKeyDown="wPreviewKeyDown"

private void wPreviewKeyDown(object sender, KeyEventArgs e)
{
    MessageBox.Show(e.Key.ToString());
    if (e.Key == Key.Escape)
        this.Close();
}

Do you have another control that is possibly handling the event?

score 0 · Answer 2 · answered May 22 '18 at 08:29

0

In case you are running the WPF dialog from within a WinForms form, the Escape key appears to be filtered out. Here is a fix:

var wpfWindow = new SomeWpfWindow();
ElementHost.EnableModelessKeyboardInterop(wpfWindow);
wpfWindow.Show();

answered May 22 '18 at 08:29

Dimitri C.

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WPF keydown not capturing escape?

2 Answers2