Question

I’m trying to create a style in XAML that can be applied to any TextBlock element to make the text blink. Here is the style:

<Style x:Key="BlinkingTextBlock" TargetType="TextBlock">
    <Style.Resources>
        <Storyboard x:Key="FlashMe" RepeatBehavior="Forever">
            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)">
                <DiscreteObjectKeyFrame KeyTime="0:0:0.5">
                    <DiscreteObjectKeyFrame.Value>
                        <Visibility>Collapsed</Visibility>
                    </DiscreteObjectKeyFrame.Value>
                </DiscreteObjectKeyFrame>
                <DiscreteObjectKeyFrame KeyTime="0:0:1">
                    <DiscreteObjectKeyFrame.Value>
                        <Visibility>Visible</Visibility>
                    </DiscreteObjectKeyFrame.Value>
                </DiscreteObjectKeyFrame>
            </ObjectAnimationUsingKeyFrames>
        </Storyboard>
    </Style.Resources>

    <Style.Triggers>
        <EventTrigger RoutedEvent="Loaded">
            <BeginStoryboard x:Name="FlashMe" />
        </EventTrigger>
    </Style.Triggers>
</Style>

When I apply it to a text block

<TextBlock FontSize="16" FontStyle="Italic" FontWeight="Bold" Foreground="Red" Style="{StaticResource BlinkingTextBlock}" >

I get an error:

Must have a Storyboard object reference before this trigger action can execute.

Does anyone have an idea of where I need another storyboard?

Answer 1

The error says it all, you should bind to the “FlashMe” StoryBoard:

<BeginStoryboard  Storyboard= "{StaticResource FlashMe}" />