Xaml LeftAlt in KeyGesture not allowed

Question

How I can use this key combination in XAML?

<RoutedUICommand x:Key="GlobalExitCommand" Text="Execute GlobalExitCommand">
            <RoutedUICommand.InputGestures>
                <KeyGesture>LeftAlt+F1</KeyGesture>
            </RoutedUICommand.InputGestures>
        </RoutedUICommand>

The LeftAlt+F1 is not allowed. Thanks in advance

Answer 1

LeftAlt is not a valid ModifierKeys value. The valid values are None, Alt, Control, Shift and Windows.

So you can't create a KeyGesture that only accepts the left ALT in XAML. You could use Alt and handle the rest in your Executed event handler though:

<Window.Resources>
    <RoutedUICommand x:Key="GlobalExitCommand" Text="Execute GlobalExitCommand">
        <RoutedUICommand.InputGestures>
            <KeyGesture>Alt+F1</KeyGesture>
        </RoutedUICommand.InputGestures>
    </RoutedUICommand>
</Window.Resources>
<Window.CommandBindings>
    <CommandBinding Command="{StaticResource GlobalExitCommand}" Executed="CommandBinding_Executed" />
</Window.CommandBindings>

---

private void CommandBinding_Executed(object sender, ExecutedRoutedEventArgs e)
{
    if (Keyboard.IsKeyDown(Key.LeftAlt))
    {
        //...
    }
}