Event triggering function in resource dictionary

Question

I have a file resdict.xaml which is resource dictionary

This file is linked in my window xaml file window.xaml.cs:

<Window.Resources> <ResourceDictionary Source="resdict.xaml" /> <Window.Resources>

Now, in the window.xaml.cs i also have this code for a storyboard:

<Storyboard Completed="HandlingEventHandler"> ....some code... </Storyboard>

When the storyboard is used and completes its run, it triggers HandlingEventHandler(). This is what i want.

Now, we move the Storyboard code into the resource dictionary file resdict.xaml.

I can still use the storyboard fine, it does its thing, it plays the animations and all that, but the HandlingEventHandler is no longer triggered. Why is that?

Is there some way to remedy the situation without having to create partial class for the dictionary file?

For example, if i make the HandlingEventHandler static can i do something like:

<Storyboard Completed="{Static: Myclass.HandlingEventHandler}">

?

No this is not a duplicate, as the linked question gives a solution that this user specifically didn't ask for. — Wayne Maurer
– Wayne Maurer, Commented May 6, 2014 at 5:58

Wayne Maurer · Accepted Answer · 2014-05-06 07:22:21Z

Yes, you can use a custom attached behaviour.

Here's a simple example of how to attach the completed event:

public class StoryBoardBehaviour : DependencyObject { public static readonly DependencyProperty AttachCompletedHandlerProperty = DependencyProperty.Register("AttachCompletedHandler", typeof(bool), typeof(StoryBoardBehaviour), new PropertyMetadata(false, AttachCompletedHandlerChanged)); public static void SetAttachCompletedHandler(DependencyObject obj, bool value) { obj.SetValue(AttachCompletedHandlerProperty, value); } public static bool GetAttachCompletedHandler(DependencyObject obj) { return (bool)obj.GetValue(AttachCompletedHandlerProperty); } private static void AttachCompletedHandlerChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { var storyboard = (Storyboard)d; var oldValue = (bool)e.OldValue; var newValue = (bool)e.NewValue; if (newValue && !oldValue) { storyboard.Completed += StoryboardOnCompleted; } if (!newValue && oldValue) { storyboard.Completed -= StoryboardOnCompleted; } } private static void StoryboardOnCompleted(object sender, object o) { // Completed handler logic } }

Then in your Storyboard definition in your resource dictionary, add use the attached behaviour as follows:

<Storyboard behaviours:StoryBoardBehaviour.AttachCompletedHandler="True">

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