WPF故事板初学者问题 [英] WPF Storyboard beginner problem

问题描述

我正在编写我的第一个WPF应用程序，并且试图在窗体关闭时实现淡入淡出动画。我碰到了这个问题在关闭时淡出wpf窗口，该窗口显示如何制作淡出动画，但是我似乎无法正常工作。我的XAML中包含以下内容：

I'm writing my first WPF application and I'm trying to implement a fade animation when the form closes. I came across this question Fading out a wpf window on close which shows how to make a fade-out animation but I can't seem to get it working. I have this in my XAML:

<Window.Resources>
    <Storyboard Name="FadeOutStoryboard" x:Key="FadeOutStoryboard" Completed="FadeOutStoryboard_Completed">
        <DoubleAnimation Storyboard.TargetProperty="Window.Opacity" From="1" To="0" Duration="0:0:2" FillBehavior="HoldEnd" />
    </Storyboard>
</Window.Resources>

然后我有此事件处理程序：

And I then have this event handler:

    private bool doneFade;
    private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
    {
        if (!doneFade)
        {
            e.Cancel = true;
            Storyboard sb = (Storyboard)this.FindResource("FadeOutStoryboard");
            sb.Begin();
        }
    }

但是当 sb时。调用Begin（）方法会得到以下异常：

But when the sb.Begin() method is called I get this exception:

System.InvalidOperationException: No target was specified for 'System.Windows.Media.Animation.DoubleAnimation'.

如上所述，这是我第一次参加WPF，所以我很困惑自己需要做的事情在窗体关闭时添加淡出。

As stated this is my first attempt at WPF so I'm rather comfused at what I need to do to add the fade-out when the form is closing.

推荐答案

您需要向StoryBoard动画中添加目标UI元素

You need to add a target UI element to your StoryBoard animation otherwise it's got nothing to apply the animation to.

<Storyboard Name="FadeOutStoryboard" x:Key="FadeOutStoryboard" Completed="FadeOutStoryboard_Completed">        
     <DoubleAnimation Storyboard.TargetName="myWindow" Storyboard.TargetProperty="Window.Opacity" From="1" To="0" Duration="0:0:2" FillBehavior="HoldEnd" />    
</Storyboard>

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