Question

I have a simple silverlight Navigation Application.

I need to start a Storyboard when a Page is navigated on a content frame.

At first everything seemed to work fine. But now I need to do some treatment (that takes about 3 seconds) when the Page loads, just before showing the Storyboard.

Now I do not see my Storyboard animation anymore. Even if the Storyboard is started after my data is loaded.

I can emulate my problem using a Thread.Sleep like that it does the same thing :

private void Page_Loaded(object sender, RoutedEventArgs e)
{
    System.Threading.Thread.Sleep(3000);
    Storyboard1_Test.Begin();
}

Answer 1

Triggering UI changes from an event handler sometimes have this kind of issues. Usually using Dispatcher.BeginInvoke method solve it.

So just try lunching Storyboard1_Test.Begin(); from the Dispatcher.BeginInvoke

Some code (hope you don’t mind i’m using VB.NET):

Dispatcher.BeginInvoke(Sub()
                         Storyboard1_Test.Begin()
                       End Sub)

By using the dispatcher.BeginInvoke you verify that the job is excuted on the UI thread when the thread is available.