版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/yangyisen0713/article/details/18359367

利用Blend可以轻松做出WPF模仿探照灯照射文字的效果，Blend步骤不详写了，代码copy出来基本上就清楚了，就是利用矩形加圆形和透明等实现的效果。

xaml代码如下：

<Window  x:Class="WPF探照灯.MainWindow"

         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

         Title="MainWindow" Height="200" Width="527" WindowStyle="None" Background="Black" WindowStartupLocation="CenterScreen">

    <Window.Resources>

        <Storyboard x:Key="SearchLight" RepeatBehavior="Forever" AutoReverse="True">

            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)" Storyboard.TargetName="path">

                <EasingDoubleKeyFrame KeyTime="0:0:6" Value="260"/>

                <EasingDoubleKeyFrame KeyTime="0:0:7" Value="260"/>

            </DoubleAnimationUsingKeyFrames>

            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.Y)" Storyboard.TargetName="path">

                <EasingDoubleKeyFrame KeyTime="0:0:6" Value="5"/>

                <EasingDoubleKeyFrame KeyTime="0:0:7" Value="5"/>

            </DoubleAnimationUsingKeyFrames>

        </Storyboard>

    </Window.Resources>

    <Window.Triggers>

        <EventTrigger RoutedEvent="FrameworkElement.Loaded">

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

        </EventTrigger>

    </Window.Triggers>

    <Grid>

        <TextBlock Height="45" Margin="128,79,0,0" TextWrapping="Wrap" Width="459" FontSize="32" HorizontalAlignment="Left" VerticalAlignment="Top"><Run Foreground="DeepSkyBlue" Language="zh-cn" Text="祝大家：马年大吉！"/></TextBlock>

        <Path x:Name="path" Data="M532.5,10.499994 C520.34973,10.499994 510.5,20.34973 510.5,32.499994 510.5,44.650259 520.34973,54.499994 532.5,54.499998 544.65027,54.499994 554.5,44.650259 554.5,32.499994 554.5,20.34973 544.65027,10.499994 532.5,10.499994 z M0.5,0.5 L999.5,0.5 999.5,69.499987 0.5,69.499987 z" Fill="#CC00000E" HorizontalAlignment="Left" Height="67" Margin="-171.5,68,0,0" Stretch="Fill" Stroke="Black" VerticalAlignment="Top" Width="592" RenderTransformOrigin="0.5,0.5">

            <Path.RenderTransform>

                <TransformGroup>

                    <ScaleTransform/>

                    <SkewTransform/>

                    <RotateTransform/>

                    <TranslateTransform/>

                </TransformGroup>

            </Path.RenderTransform>

        </Path>

    </Grid>

</Window>

效果如图：