[WPF] 如何为无边框窗口设置阴影效果

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