C# 如何停止动画WPF？

如何停止动画，使其不会产生

Completed

事件。下面是一个简单的例子

<Window x:Class="WpfApplication5.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="248" Width="318">
    <Grid>
        <Border Width="20" Height="20" Background="Red" MouseEnter="Border_MouseEnter" MouseLeave="Border_MouseLeave" x:Name="border" />
    </Grid>
</Window>

若在矩形变为白色之前将鼠标移出，一段时间后仍将显示弹出窗口。如何预防？让我们假设

Border\u MouseLeave

和

Border\u MouseEnter

方法彼此不了解（它们不能相互传递动画实例变量）。

您可以使用以下方法：

<Border Width="20" Height="20" Background="Red" x:Name="border" >
                <Border.Triggers>
                    <EventTrigger RoutedEvent="MouseEnter">
                        <BeginStoryboard Name="Ali">
                            <Storyboard>
                                <DoubleAnimation To="0" Duration="0:0:4" Completed="com" Storyboard.TargetProperty="Opacity"/>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger>
                    <EventTrigger RoutedEvent="MouseLeave">
                        <StopStoryboard  BeginStoryboardName="Ali"/>
                    </EventTrigger>
                </Border.Triggers>
            </Border>

---

您可以使用属性或数据触发器的Enteraction和ExitActions属性，或者如@Ali所说，正确使用开始和停止情节提要

<Border Width="20" Height="20" Background="Red" x:Name="border" >
                <Border.Triggers>
                    <EventTrigger RoutedEvent="MouseEnter">
                        <BeginStoryboard Name="Ali">
                            <Storyboard>
                                <DoubleAnimation To="0" Duration="0:0:4" Completed="com" Storyboard.TargetProperty="Opacity"/>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger>
                    <EventTrigger RoutedEvent="MouseLeave">
                        <StopStoryboard  BeginStoryboardName="Ali"/>
                    </EventTrigger>
                </Border.Triggers>
            </Border>

private void com(object sender, EventArgs e)
        {
            MessageBox.Show("boom!");
        }