WPF 기초 이벤트 트리거 에니메이션 주기 샘플 글크기 변경 AutoReverse

<StackPanel>
    <TextBlock x:Name="textblock" 
    Foreground="Blue" Text="{Binding ElementName=textbox, Path=Text, UpdateSourceTrigger=PropertyChanged}" Width="100" />
    <TextBox Name="textbox" Margin="5" Width="100" Text="Hello, WPF!"/>
    <Button Margin="5" Width="100" Content="Change Text Color">
    <Button.Triggers>
        <EventTrigger RoutedEvent="Button.Click" >
            <BeginStoryboard>
                <Storyboard>
	    	<ColorAnimation 
		 Storyboard.TargetName="textblock" 
		 Storyboard.TargetProperty="(TextBlock.Foreground).(SolidColorBrush.Color)"     	        From="Black" To="Red" Duration="0:0:1"/>
<!--textbox의  foreground가 null 이면 변경할 수 없는 개체 인스턴스에서 '(0).(1)'에 애니메이션 효과를 줄 수 없습니다.에러-->
		</Storyboard>
           </BeginStoryboard>
	</EventTrigger>
     </Button.Triggers>
</Button>

<Button Margin="5" Width="200"  Content="Change Text Size">
<Button.Triggers>
     <EventTrigger RoutedEvent="Button.Click">
	<BeginStoryboard>
	<Storyboard>
	    <DoubleAnimation 
		Storyboard.TargetName="textblock"  
		Storyboard.TargetProperty="FontSize" 
		AutoReverse="True"
		From="11" To="124" Duration="0:0:1.2"/>
<!--AutoReverse 역방향재생여부-->
	   </Storyboard>
	   </BeginStoryboard>
       </EventTrigger>
    </Button.Triggers>
</Button>
</StackPanel>

reference : Practical WPF Graphics Programming