您可以在主窗口中编写按键事件.

You can write a key down event on main window..

KeyDown="Window_KeyDown"

以及文件后面的代码中..

and in the code behind file..

 private void Window_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.LeftAlt || e.Key == Key.RightAlt)
            {
                myMenu.Visibility = Visibility.Visible;
            }
        }

如果您想通过MVVM或使用绑定来实现这一点...您可以使用输入键绑定

if you want to achive this with MVVM or using bindings... you can use input key bindings

 <Window.InputBindings>
        <KeyBinding Key="LeftAlt" Command="{Binding ShowMenuCommand}"/>
        <KeyBinding Key="RightAlt" Command="{Binding ShowMenuCommand}"/>
    </Window.InputBindings>