How to Close a Window in WPF on a escape key

Question

Possible Duplicate:
How can I assign the 'Close on Escape-key press' behavior to all WPF windows within a project?

Answer 1

You can create a custom DependencyProperty:

using System.Windows;
using System.Windows.Input;

public static class WindowUtilities
{
    /// 

    /// Property to allow closing window on Esc key.
    /// 
    public static readonly DependencyProperty CloseOnEscapeProperty = DependencyProperty.RegisterAttached(
       "CloseOnEscape",
       typeof(bool),
       typeof(WindowUtilities),
       new FrameworkPropertyMetadata(false, CloseOnEscapeChanged));

    public static bool GetCloseOnEscape(DependencyObject d)
    {
        return (bool)d.GetValue(CloseOnEscapeProperty);
    }

    public static void SetCloseOnEscape(DependencyObject d, bool value)
    {
        d.SetValue(CloseOnEscapeProperty, value);
    }

    private static void CloseOnEscapeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is Window target)
        {
            if ((bool)e.NewValue)
            {
                target.PreviewKeyDown += Window_PreviewKeyDown;
            }
            else
            {
                target.PreviewKeyDown -= Window_PreviewKeyDown;
            }
        }
    }

    private static void Window_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (sender is Window target)
        {
            if (e.Key == Key.Escape)
            {
                target.Close();
            }
        }
    }
}

And use it your windows' XAML like this:

The answer is based on the content of the gist referenced in this answer.