[WPF]ボーダーレスウィンドウのシャドウ効果を設定する方法

ウィンドウスタイルをAppに追加する必要があります.xamlで

<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>