WPF Animation “Cannot freeze this Storyboard timeline tree for use across threads”

问题:

I currently have a listbox that has its selected item bound to a property on my ViewModel. Whenever the selected item isn't null I want to perform an animation on it. However I keep getting the following error "Cannot freeze this Storyboard timeline tree for use across threads" and from research sort of understand why this is happening. However I am unsure of what approach I need to take to get the behavior I want.

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回答1:

Can you post your Storyboard? It sounds like you have some kind of Binding in the Storyboard definition.

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Ok so, as I suspected, it's because you're using a Binding in your Storyboard. You can't do this because WPF attempts to freeze all the resources leveraged by a template for efficiency and when you use a Binding on a Freezable, in this case the Storyboard, it prevents it from being able to be frozen.

回答2:

There is a technique that you can use to get around the Freezable issue that allows you to use a binding for the "To" value of your animation (rather than hard-coding a value there). Its pretty straightforward and I've outlined it here.

回答3:

Old question but might be useful for other people. Sometimes creating the Storyboard in the code-behind can be simpler: https://stackoverflow.com/a/10848781/779521

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