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Editorial Team
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Asked: 2026-06-16T23:25:59+00:00

I have an animation before closing the main window, like the following code shows.

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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(); };
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1 Answer

  1. Editorial Team

    Add the Completed handler before calling Begin:

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

    The reason for this behaviour is that the Completed handler is attached to an internal Clock object that 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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