先建立一个 RoutedUICommand，x:key 为 CommandDefualtButton，然后响应 Ctrl+D 的 KeyBinding，用 CommandBindingCanExecute 来判断是否满足 CommandBinding 的执行条件，如果满足就执行 CommandBindingExecuted

xml<Window>
    <Window.Resources>
        <RoutedUICommand x:Key="CommandDefualtButton" Text="CommandDefualtButton_C"/>
    </Window.Resources>
    <Window.InputBindings>
        <KeyBinding Gesture="Ctrl+D" Command="{StaticResource ResourceKey=CommandDefualtButton}"/>
    </Window.InputBindings>
    <Window.CommandBindings>
        <CommandBinding Command="{StaticResource ResourceKey=CommandDefualtButton}" CanExecute="CommandBindingCanExecute" Executed="CommandBindingExecuted"/>
    </Window.CommandBindings>
</Window>