您可以创建一个ThemeResource，比方说 CustomStackPanelBackground。
例如，在整个应用程序的App.xaml中：

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
            <ResourceDictionary Source="/Styles/FontSizes.xaml" />
            <ResourceDictionary Source="/Styles/Thickness.xaml" />
            <ResourceDictionary Source="/Styles/Styles.xaml" />
            <ResourceDictionary Source="/Styles/TextBlocks.xaml" />
            <ResourceDictionary>
                <ResourceDictionary.ThemeDictionaries>
                    <ResourceDictionary x:Key="Light">
                        <SolidColorBrush
                            x:Key="CustomBackground"
                            Color="HotPink" />
                    </ResourceDictionary>
                    <ResourceDictionary x:Key="Dark">
                        <SolidColorBrush
                            x:Key="CustomBackground"
                            Color="SkyBlue" />
                    </ResourceDictionary>
                </ResourceDictionary.ThemeDictionaries>
            </ResourceDictionary>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

字符串
或者如果您只想在Page中使用它：

<Page.Resources>
    <ResourceDictionary>
        <ResourceDictionary.ThemeDictionaries>
            <ResourceDictionary x:Key="Light">
                <SolidColorBrush
                    x:Key="CustomBackground"
                    Color="LightGreen" />
            </ResourceDictionary>
            <ResourceDictionary x:Key="Dark">
                <SolidColorBrush
                    x:Key="CustomBackground"
                    Color="SkyBlue" />
            </ResourceDictionary>
        </ResourceDictionary.ThemeDictionaries>
    </ResourceDictionary>
</Page.Resources>

型
实际上是这样使用的：

<Grid Background="{ThemeResource CustomBackground}">
...
</Grid>

型

您需要定义主题相关画笔。通过在“Light”和“Dark”资源字典中定义相同的名称，
当此画笔应用于XAML元素时，其颜色由当前主题在运行时确定，如下表所示。
例如，microsoft-ui-xaml/dev/NavigationView /NavigationView_rs1_themeresources_v1.xaml。