[WPF] 如何为无边框窗口设置阴影效果

需要将窗口样式添加到 App.xaml 中

 <Style x:Key="for_noresize_window" TargetType="{x:Type Window}">
     <Setter Property="AllowsTransparency" Value="true"/>
     <Setter Property="Background" Value="Transparent"/>
     <Setter Property="FontFamily" Value="Consolas, Microsoft YaHei"/>
     <Setter Property="FontSize" Value="24"/>
     <Setter Property="ResizeMode" Value="NoResize"/>
     <Setter Property="WindowStyle" Value="None"/>
     <Setter Property="Template">
         <Setter.Value>
             <ControlTemplate TargetType="{x:Type Window}">
                 <Grid Margin="10">
                     <Rectangle Fill="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"
                                RadiusX="5" RadiusY="5">
                         <Rectangle.Effect>
                             <DropShadowEffect BlurRadius="10" ShadowDepth="0"/>
                         Rectangle.Effect>
                     Rectangle>
                     <Border Background="{TemplateBinding Background}"
                             BorderBrush="{TemplateBinding BorderBrush}"
                             BorderThickness="{TemplateBinding BorderThickness}"
                             Padding="{TemplateBinding Margin}"
                             SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                             CornerRadius="5">
                         <ContentPresenter />
                     Border>
                 Grid>
             ControlTemplate>
         Setter.Value>
     Setter>
 Style>

 <Window x:Class="TestProject.Windows.NoResizeWithShadowEffect"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         Background="Transparent" Height="500" Width="500"
         Title="NoResizeWithShadowEffect"
         WindowStartupLocation="CenterScreen"
         Style="{StaticResource for_noresize_window}">
     <Grid>
         <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
             <Label Content="NoResizeWithShadowEffect" Foreground="Olive"/>
             <TextBlock Text=""/>
             <Button Padding="20,5" Content="Close Window" Click="Clicked"/>
             <x:Code>

                 void Clicked(object sender, RoutedEventArgs e)
                 {
                     this.Close();
                 }
                 ]]>
             x:Code>
         StackPanel>
     Grid>
 Window>