Change DoubleAnimation From property

Question

I have defined Storyboard with DoubleAnimation in it and I need to change From value in code-behind before starting the animation. How can I do it?

This doesn't work - I get an exception Object reference not set to an instance of an object.

<Storyboard x:Key="SB_showhide" Duration="0:0:1">
    <DoubleAnimation x:Name="move" Storyboard.TargetProperty="(Window.Left)" From="0" To="500" />
</Storyboard>

((DoubleAnimation)FindName("move")).From = 200;
BeginStoryboard((Storyboard)FindResource("SB_showhide"));

Is it feasible to move the entire Storyboard to codebehind? See Terry's answer here: http://stackoverflow.com/questions/15900627/creating-storyboard-in-code-behind-in-wpf . — goobering, Apr 12 '15 at 15:27
I have it in my `Wnd : Window` which is created in my `MainEnvironment` class, which is created in `OnStartup` method in App.xaml.cs. The files my code is written in are named `Wnd.xaml` and `Wnd.xaml.cs`. — Martin Heralecký, Apr 12 '15 at 15:45
`MainEnvironment` is a class which should initialize and start the application. It is not a window, just a class. And here I have `Wnd mainWnd = new Wnd();`. I don't think this is important. — Martin Heralecký, Apr 12 '15 at 15:55
I did. It shows me an error: _The name 'move' does not exist in the current context_. — Martin Heralecký, Apr 12 '15 at 16:13

score 5 · Answer 1 · answered Apr 12 '15 at 16:46

5

This should work:

var storyboard = (Storyboard)Resources["SB_showhide"];
var move = (DoubleAnimation)storyboard.Children[0];
move.From = 200;

answered Apr 12 '15 at 16:46

Clemens

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Change DoubleAnimation From property

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