UWP XAML在ContentDialog后面隐藏阴影

UWP（Universal Windows Platform）是微软推出的一种应用程序开发框架，旨在实现跨设备、跨平台的应用程序开发。XAML（eXtensible Application Markup Language）是一种用于定义用户界面的标记语言，用于创建 UWP 应用程序的界面。

ContentDialog 是 UWP 中的一个控件，用于显示自定义的对话框内容。在 ContentDialog 控件中，默认情况下会有一个阴影效果，用于突出对话框与其他内容的层次感。

如果想要隐藏 ContentDialog 后面的阴影效果，可以通过修改 ContentDialog 的样式来实现。具体步骤如下：

在 UWP 项目中，找到 App.xaml 文件，打开它。
在 <Application.Resources> 标签内，添加一个新的 <ResourceDictionary> 标签。
在新的 <ResourceDictionary> 标签内，添加以下代码：

<Style TargetType="ContentDialog">
    <Setter Property="Background" Value="Transparent"/>
    <Setter Property="BorderBrush" Value="Transparent"/>
    <Setter Property="RequestedTheme" Value="Light"/>
    <Setter Property="IsTabStop" Value="False"/>
    <Setter Property="TabNavigation" Value="Cycle"/>
    <Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}"/>
    <Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}"/>
    <Setter Property="MinWidth" Value="{ThemeResource ContentDialogMinWidth}"/>
    <Setter Property="MaxWidth" Value="{ThemeResource ContentDialogMaxWidth}"/>
    <Setter Property="MinHeight" Value="{ThemeResource ContentDialogMinHeight}"/>
    <Setter Property="MaxHeight" Value="{ThemeResource ContentDialogMaxHeight}"/>
    <Setter Property="HorizontalAlignment" Value="Center"/>
    <Setter Property="VerticalAlignment" Value="Top"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ContentDialog">
                <Border x:Name="Container" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Margin="{TemplateBinding Margin}" MaxWidth="{TemplateBinding MaxWidth}" MaxHeight="{TemplateBinding MaxHeight}" MinWidth="{TemplateBinding MinWidth}" MinHeight="{TemplateBinding MinHeight}" RenderTransformOrigin="0.5,0.5">
                    <Border.RenderTransform>
                        <ScaleTransform x:Name="RootScaleTransform"/>
                    </Border.RenderTransform>
                    <Grid x:Name="LayoutRoot" Background="{TemplateBinding Background}" Margin="0,0,0,0">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="*"/>
                            <RowDefinition Height="Auto"/>
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                        </Grid.ColumnDefinitions>
                        <ContentControl x:Name="Title" Content="{TemplateBinding Title}" ContentTemplate="{TemplateBinding TitleTemplate}" FontSize="20" FontWeight="SemiBold" Foreground="{ThemeResource SystemControlForegroundBaseHighBrush}" HorizontalAlignment="Left" Margin="0,0,0,0" VerticalAlignment="Top"/>
                        <ContentPresenter x:Name="Content" AutomationProperties.AccessibilityView="Raw" ContentTemplate="{TemplateBinding ContentTemplate}" ContentTransitions="{TemplateBinding ContentTransitions}" Grid.Row="1" HorizontalAlignment="Stretch" Margin="0,20,0,0" VerticalAlignment="Top"/>
                        <Grid x:Name="CommandSpace" Grid.Row="2" HorizontalAlignment="Stretch" Margin="0,20,0,0" VerticalAlignment="Bottom">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto"/>
                                <ColumnDefinition Width="Auto"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="Auto"/>
                            </Grid.RowDefinitions>
                            <ContentControl x:Name="SecondaryButton" AutomationProperties.AccessibilityView="Raw" Content="{TemplateBinding SecondaryButtonText}" FontSize="16" FontWeight="SemiBold" Foreground="{ThemeResource SystemControlForegroundBaseHighBrush}" HorizontalAlignment="Right" IsTabStop="True" Margin="0,0,0,0" Padding="24,0,0,0" TabIndex="1" VerticalAlignment="Bottom"/>
                            <ContentControl x:Name="PrimaryButton" AutomationProperties.AccessibilityView="Raw" Content="{TemplateBinding PrimaryButtonText}" FontSize="16" FontWeight="SemiBold" Foreground="{ThemeResource SystemControlForegroundBaseHighBrush}" HorizontalAlignment="Right" IsTabStop="True" Margin="0,0,0,0" Padding="24,0,0,0" TabIndex="0" VerticalAlignment="Bottom"/>
                        </Grid>
                    </Grid>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>