相关疑难解决方法(0)

我想在我的应用程序中淡入/淡出一个窗口.
淡入时发生Window.Loaded,我想在关闭(Window.Closed或Window.Closing)时淡出.淡入效果完美,但Window.Closing不允许RoutedEvent财产价值.
我RoutedEvent应该用什么关闭？

    <Window.Triggers>
        <EventTrigger RoutedEvent="Window.Loaded">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation Storyboard.TargetProperty="Opacity" From="0" To="1" Duration="0:0:2" FillBehavior="HoldEnd" />
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
        <EventTrigger RoutedEvent="Window.Closing">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation Storyboard.TargetProperty="Opacity" From="1" To="0" Duration="0:0:2" FillBehavior="HoldEnd" />
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Window.Triggers>

我收到错误,值'Window.Closing'无法分配给属性'RoutedEvent'.无效的活动名称.

我想知道哪个是第一次显示WPF窗口时检测的正确方法？