使用动画删除ObservableCollection项

Question

  

可能重复：
  How can I implement fading in and out of Added/Removed ListItems

当我删除项目时，我尝试LayoutStates和FrameworkElement.Unloaded来制作动画，但它不起作用。

我认为在执行动画之前删除了该项目！

有人知道解决方案吗？

<EventTrigger RoutedEvent="FrameworkElement.Unloaded">
    <BeginStoryboard>
        <Storyboard>
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)" Storyboard.TargetName="grid">
                <EasingDoubleKeyFrame KeyTime="0:0:0.4" Value="0.6"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.6" Value="1.6"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.7" Value="0"/>
            </DoubleAnimationUsingKeyFrames>
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)" Storyboard.TargetName="grid">
                <EasingDoubleKeyFrame KeyTime="0:0:0.4" Value="0.6"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.6" Value="1.6"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.7" Value="0"/>
            </DoubleAnimationUsingKeyFrames>
        </Storyboard>
    </BeginStoryboard>
</EventTrigger>