如何从WPF中的Viewport3d.Triggers中提取Storyboard

Question

I have a separate xaml file that looks like this :

<Viewport3D x:Name="ZAM3DViewport3D" ClipToBounds="true" Width="400" Height="300" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/interactivedesigner/2006" xmlns:c="http://schemas.openxmlformats.org/markup-compatibility/2006" c:Ignorable="d">
<Viewport3D.Triggers>
    <EventTrigger RoutedEvent="Viewport3D.Loaded">
        <EventTrigger.Actions>
            <BeginStoryboard>
                <Storyboard Duration="Forever" FillBehavior="HoldEnd" BeginTime="0:0:0" x:Name="storyboard" d:StoryboardName="OnLoaded">
.....

And I have this segment of code in the program :

....
FileStream fs = new FileStream(mm.path, FileMode.Open, FileAccess.Read); //
Viewport3D v3d = (Viewport3D)XamlReader.Load(fs);
....

I would like to know how I can extract the storyboard from the EventTrigger.Actions. I guess it would look like this:

Storyboard sb = (Storyboard)v3d.Triggers[0]....

Does anyone know how to do this?

Answer 1

If you need a Storyboard somewhere else beside the Triggers define it as resource. Then you can reference it in BeginStoryboard using StaticResource and in code you can find it with FindResource or get it directly from the Resources property.

<Viewport3D.Resources>
    <Storyboard x:Key="ThatSb">...</Storyboard>
<Viewport3D.Resources>
<!-- .... -->
    <BeginStoryboard Storyboard="{StaticResource ThatSb}"/>

Storyboard sb = (Storyboard)v3d.Resources["ThatSb"];

---

The not so nice alternative is actually casting your way down, something like

var trigger = (EventTrigger)v3d.Triggers[0];
var beginSb = (BeginStoryboard)trigger.Actions[0];
var sb = beginSb.Storyboard;