InputBinding代替PreviewKeyDown

#region Constructor
PreviewKeyDown += SoftKeyMainPreviewKeyDown;
#endregion

private void SoftKeyMainPreviewKeyDown(object sender, KeyEventArgs e)
{
        var focusedElement = Keyboard.FocusedElement;
        switch (e.Key)
        {
            case Key.Up:
                DoSomething();
                break;
            .....
        }
}

<UserControl.InputBindings>
    <KeyBinding Gesture=\"Up\" Command=\"{Binding ElementName=_MaschinenView, Path=UpCommand}\" />
    ....
</UserControl.InputBindings>

public ICommand UpCommand { get; set; }

UpCommand = new SimpleCommand { ExecuteDelegate = delegate { MoveFocusInDirection(Keyboard.FocusedElement, new TraversalRequest(FocusNavigationDirection.Up)); } };