如何从代码隐藏中在用户控件的内容控件中的数据模板中启动故事板？

Question

PHEW.

I'm serious. I'll spell it out as follows...

The Storyboard has a Key "myStoryboard". It's held in a DataTemplate with a key "myDataTemplate".

This data template is used in a ContentControl with the name "myContentControl" by this tag:

<ContentControl Name="myContentControl" 
    ContentTemplate="{DynamicResource myDataTemplate}"/> 

The content control is used in my UserControl. In the UserControl codebehind I've made a keyboard gesture that supposed to start "myStoryBoard" but i'm having no such luck getting to it.

private void StartSB(object sender, ExecutedRoutedEventArgs e) 
{ 
  Storyboard sb = (Storyboard) this.TryFindResource("myStoryboard"); 
  sb.Begin(this);  
} 

sb is always null here. How can i get the Storyboard?

UPDATE:

so playing with TryFindResource() I've managed to get to myDataTemplate

private void StartSB(object sender, ExecutedRoutedEventArgs e) 
{ 
  object sb = this.myContentControl.TryFindResource("myDataTemplate");  
} 

in the Locals viewer I can see sb is myDataTemplate. I can see in the tree sb.base.Resources.Keys which is an array of resources in which "myStoryboard" is inside. Oh so close!

UPDATE2:

More code complete here. I realize now this may be too spaghettified to explain with words.

<UserControl > 
  <UserControl.Resources>
   <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="Resources\myUCResources.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
  </UserControl.Resources>
  <ContentControl Name="myContentControl"  
           ContentTemplate="{DynamicResource myDataTemplate}" 
               Content="{Binding}" /> 
  ... 
</UserControl> 

now the codebehind for this User control

namespace myclass 
{ 
  public partial class myUserControl: UserControl,  System.ComponentModel.INotifyPropertyChanged 
   { 
     ... 
      public myUserControl() 
      { 
         InitializeComponent(); 

         <!--setup keybinding--> 
      } 

      public void KeyBindExecuted(object sender, ExecutedRoutedEventArgs e) 
      { 
         Object sb = this.myContentControl.TryFindResource("myDataTemplate");  
         //sb returns the DataTemplate 
      } 

   } 
} 

And finally the resource dictionary containing the UI stuff and the animation I ultimately want to trigger. (myUCResources.xaml)

<ResourceDictionary> 
    <DataTemplate x:Key="myDataTemplate" > 
        <Grid> 
           <!-- elements like buttons --> 
        </Grid> 
        <DataTemplate.Resources> 
            <Storyboard x:Key="myStoryBoard"> 
                <DoubleAnimation>
                     <!-- animation stuff--> 
                </DoubleAnimation> 

            </Storyboard> 
        </DataTemplate.Resources> 
        <DataTemplate.Triggers> 
            <EventTrigger SourceName="aButton" RoutedEvent="Button.Click">
                  <BeginStoryboard Storyboard="{StaticResource myStoryBoard}" />
                </EventTrigger>
        </DataTemplate.Triggers> 
    </DataTemplate> 
</ResourceDictionary> 

Update 3:

ok different approach. Can I use the EventTrigger in the DataTemplate from the codebehind to start the animation?

Answer 1

AH HAH!

So I found a roundabout way to solving this. My third update where I entertained the thought of just firing an event seemed more fruitful. All can be found here.

http://www.codeproject.com/script/Forums/View.aspx?fid=1004114&msg=2827455

In a nutshell I used FindResource to get the DataTemplate, then FindName of the button in the DataTemplate used to normally trigger the animation. Then I raised a button click on that button.