WPF在XAML中实现持续动画的暂停、恢复、停止

1.动画通过EventTrigger监听按钮的FrameworkElement.Loaded事件，但控件载入时就进行动画，

   持续动画通过<BeginStoryboard Name="yourStoryName">下的<Storyboard>或者子动画的RepeatBehavior=Forever来实现，

   鼠标的移入移出，通过监听UIElement.MouseEnter和UIElement.MouseLeave事件，

　鼠标移入时，通过<PauseStoryboard BeginStoryboardName="yourStoryName"/>来暂停动画，

   鼠标移出时，通过<ResumeStoryboard BeginStoryboardName="yourStoryName"/>来恢复动画，具体代码如下：

<Button Content="Click Me">
    <Button.Triggers>
        <EventTrigger RoutedEvent="FrameworkElement.Loaded">
            <BeginStoryboard Name="OpacityStoryboard">
                <Storyboard>
                    <DoubleAnimation Storyboard.TargetProperty="(UIElement.Opacity)"
                        From="0" To="1" RepeatBehavior="Forever" AutoReverse="True" />
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
        <EventTrigger RoutedEvent="UIElement.MouseEnter">
            <PauseStoryboard BeginStoryboardName="OpacityStoryboard" />
        </EventTrigger>
        <EventTrigger RoutedEvent="UIElement.MouseLeave">
            <ResumeStoryboard BeginStoryboardName="OpacityStoryboard" />
        </EventTrigger>
    </Button.Triggers>
</Button>

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