WPF Storyboard beginner problem

Question

I'm writing my first WPF application and I'm trying to implement a fade animation when the form closes. I came across this question Fading out a wpf window on close which shows how to make a fade-out animation but I can't seem to get it working. I have this in my XAML:

<Window.Resources> <Storyboard Name="FadeOutStoryboard" x:Key="FadeOutStoryboard" Completed="FadeOutStoryboard_Completed"> <DoubleAnimation Storyboard.TargetProperty="Window.Opacity" From="1" To="0" Duration="0:0:2" FillBehavior="HoldEnd" /> </Storyboard> </Window.Resources>

And I then have this event handler:

 private bool doneFade; private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e) { if (!doneFade) { e.Cancel = true; Storyboard sb = (Storyboard)this.FindResource("FadeOutStoryboard"); sb.Begin(); } }

But when the sb.Begin() method is called I get this exception:

System.InvalidOperationException: No target was specified for 'System.Windows.Media.Animation.DoubleAnimation'.

As stated this is my first attempt at WPF so I'm rather comfused at what I need to do to add the fade-out when the form is closing.

sipsorcery · Accepted Answer · 2009-05-26 13:07:33Z

You need to add a target UI element to your StoryBoard animation otherwise it's got nothing to apply the animation to.

<Storyboard Name="FadeOutStoryboard" x:Key="FadeOutStoryboard" Completed="FadeOutStoryboard_Completed"> <DoubleAnimation Storyboard.TargetName="myWindow" Storyboard.TargetProperty="Window.Opacity" From="1" To="0" Duration="0:0:2" FillBehavior="HoldEnd" /> </Storyboard>

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