WPF StoryBoard.Completed event not firing

问题:

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(); }; 

回答1:

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.

文章来源: WPF StoryBoard.Completed event not firing