How to trigger an Animation when TextBlock’s Text is changed during a DataBinding

原文：http://michaelscherf.wordpress.com/2009/02/23/how-to-trigger-an-animation-when-textblocks-text-is-changed-during-a-databinding/

        <TextBlock x:Name="tbMessage" Text="{Binding Path=StatusBarText, NotifyOnTargetUpdated=True}">
            <TextBlock.Triggers>
                <EventTrigger RoutedEvent="Binding.TargetUpdated">
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation Storyboard.TargetProperty="Opacity" Duration="0:0:0" To="1.0" />
                            <DoubleAnimation Storyboard.TargetProperty="Opacity" Duration="0:0:2" From="1.0" To="0.0" BeginTime="0:0:5" />
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </TextBlock.Triggers>
        </TextBlock>