事件触发器 一般使用的就是动画

    <Grid>



        <TextBlock Text="事件触发器" Opacity="0.2" FontSize="30" HorizontalAlignment="Center" VerticalAlignment="Center">



            <TextBlock.Style>



                <Style TargetType="{x:Type TextBlock}">



                    <Style.Triggers>



                        <EventTrigger RoutedEvent="MouseEnter">



                            <EventTrigger.Actions>



                                <BeginStoryboard>



                                    <Storyboard>



                                        <DoubleAnimation Storyboard.TargetProperty="Opacity" Duration="0:0:0.5" To="1"></DoubleAnimation>



                                        <DoubleAnimation Storyboard.TargetProperty="FontSize" Duration="0:0:0.5" To="50"></DoubleAnimation>



                                    </Storyboard>



                                </BeginStoryboard>



                            </EventTrigger.Actions>



                        </EventTrigger>



                        <EventTrigger RoutedEvent="MouseLeave">



                            <EventTrigger.Actions>



                                <BeginStoryboard>



                                    <Storyboard>



                                        <DoubleAnimation Storyboard.TargetProperty="Opacity" Duration="0:0:0.5" To="0.2"></DoubleAnimation>



                                            <DoubleAnimation Storyboard.TargetProperty="FontSize" Duration="0:0:0.5" To="30"></DoubleAnimation>



                                    </Storyboard>



                                </BeginStoryboard>



                            </EventTrigger.Actions>



                        </EventTrigger>



                    </Style.Triggers>



                </Style>



            </TextBlock.Style>



        </TextBlock>



    </Grid>

动手写 比较精简 用Blend 来写 会生成很多代码哟

WPF 精修篇 事件触发器