这种方法不如限定符方便，但有效.

This aproach isn't as convenient as qualifiers, but it works.

在 App.xaml 中定义

Define in App.xaml

<ResourceDictionary>
    <ResourceDictionary.ThemeDictionaries>
        <ResourceDictionary x:Key="Light">
            <ImageSource x:Key="Logo">/Assets/Logo-White.png</ImageSource>
        </ResourceDictionary>

        <ResourceDictionary x:Key="Dark">
            <ImageSource x:Key="Logo">/Assets/Logo-Blue.png</ImageSource>
        </ResourceDictionary>

        <ResourceDictionary x:Key="HighContrast">
            <ImageSource x:Key="Logo">/Assets/Logo-White.png</ImageSource>
        </ResourceDictionary>
    </ResourceDictionary.ThemeDictionaries>
</ResourceDictionary>

然后使用

<Image Source="{ThemeResource Logo}"/>