WPF StoryBoard.Completed事件不触发 [英] WPF StoryBoard.Completed event not firing

问题描述

我关闭主窗口，如下code表示之前的动画。问题是 StoryBoard.Completed 不点火。任何线索是什么原因造成的？

code

  DoubleAnimation是dblAnimX =新DoubleAnimation是（1.0，0.0，新的持续时间（TimeSpan.FromSeconds（0.5）））;
dblAnimX.SetValue（Storyboard.TargetProperty，这一点）;

DoubleAnimation是dblAnimY =新DoubleAnimation是（1.0，0.0，新持续时间（TimeSpan.FromSeconds（0.5）））;
dblAnimY.SetValue（Storyboard.TargetProperty，这一点）;

故事板故事=新的故事板（）;
Storyboard.SetTarget（dblAnimX，这一点）;
Storyboard.SetTarget（dblAnimY，这一点）;
Storyboard.SetTargetProperty（dblAnimX，新的PropertyPath（RenderTransform.ScaleX））;
Storyboard.SetTargetProperty（dblAnimY，新的PropertyPath（RenderTransform.ScaleY））;

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

story.Completed + =（O，S）=＆GT; {this.Close（）; };
 

解决方案

在调用开始之前添加完成处理程序：

  story.Completed + =（O，S）=＆GT;关闭（）;
story.Begin（本）;
 

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我想这种现象的原因是，完成处理程序实际上是连接到一个时钟对象，这是在开始创建。请参阅<一个备注部分href="http://msdn.microsoft.com/en-us/library/vstudio/system.windows.media.animation.timeline.completed.aspx">Completed:

  

虽然此事件处理似乎与时间轴相关联，   它实际上与这个时间表创建的时钟寄存器。对于   更多信息，请参见时序事件概述。

I have an animation before closing the main window, like the following code shows. Problem is the StoryBoard.Completed is not firing. Any clues what is causing this?

Code

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(); };

解决方案

Add the Completed handler before calling Begin:

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

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I guess the reason for this behaviour is that the Completed handler is actually attached to a Clock object, which is created during Begin. See the Remarks section in Completed:

Although this event handler appears to be associated with a timeline, it actually registers with the Clock created for this timeline. For more information, see the Timing Events Overview.

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