wpf 加阴影效果导致内容模糊的问题解决

这个和GPU有关，参考地址

https://www.cplotts.com/2009/02/25/gpu-effects-blurry-text/

产生问题的代码如下：

 <Window
     x:Class="EffectsAndBlurryText.Window1"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     Title="Effects and Blurry Text (Bad)"
     Height="300"
     Width="500"
 >
     <Grid>
         <Border
             Margin="20"
             Background="White"
             BorderBrush="DarkBlue"
             BorderThickness="3"
             CornerRadius="25"
         >
             <Border.Effect>
                 <DropShadowEffect Color="DarkGray"/>
             </Border.Effect>
             <TextBlock
                 Text="Why, oh, why is this text blurry?"
                 FontSize="24"
                 TextWrapping="Wrap"
                 Foreground="DarkBlue"
                 HorizontalAlignment="Center"
                 VerticalAlignment="Center"
             />
         </Border>
     </Grid>
 </Window>

解决问题的代码如下：

 <Window
     x:Class="EffectsAndBlurryText.Window1"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     Title="Effects and Blurry Text (Fixed)"
     Height="300"
     Width="500"
 >
     <Grid>
         <Border
             Margin="20"
             BorderThickness="3"
             CornerRadius="25"
             Background="White"
             BorderBrush="DarkBlue"
         >
             <Border.Effect>
                 <DropShadowEffect Color="DarkGray"/>
             </Border.Effect>
         </Border>
         <Border
             Margin="20"
             BorderThickness="3"
             CornerRadius="25"
         >
             <TextBlock
                 Text="Ah, now, the text is not blurry."
                 FontSize="24"
                 TextWrapping="Wrap"
                 Foreground="DarkBlue"
                 HorizontalAlignment="Center"
                 VerticalAlignment="Center"
             />
         </Border>
     </Grid>
 </Window>