WPF StoryBoard.Completed事件未触发

Question

关闭主窗口之前我有一个动画,如下面的代码所示.问题是StoryBoard.Completed没有解雇.是什么原因引起了这个？

码

DoubleAnimation dblAnimX = new DoubleAnimation(1.0, 0.0, new  Duration(TimeSpan.FromSeconds(0.5)));
dblAnimX.SetValue(Storyboard.TargetProperty, this);

DoubleAnimation dblAnimY = new DoubleAnimation(1.0, 0.0, new Duration(TimeSpan.FromSeconds(0.5)));
dblAnimY.SetValue(Storyboard.TargetProperty, this);

Storyboard story = new Storyboard();
Storyboard.SetTarget(dblAnimX, this);
Storyboard.SetTarget(dblAnimY, this);
Storyboard.SetTargetProperty(dblAnimX, new PropertyPath("RenderTransform.ScaleX"));
Storyboard.SetTargetProperty(dblAnimY, new PropertyPath("RenderTransform.ScaleY"));

story.Children.Add(dblAnimX);
story.Children.Add(dblAnimY);
story.Begin(this);

story.Completed += (o, s) => { this.Close(); };

Answer 1

在调用Begin之前添加Completed处理程序:

story.Completed += (o, s) => Close();
story.Begin(this);

此行为的原因是Completed处理程序附加到Begin期间创建的内部Clock对象.请参阅已完成中的备注部分:

虽然此事件处理程序似乎与时间轴相关联,但它实际上是为为此时间轴创建的时钟注册的.有关更多信息,请参阅时序事件概述.