如果样式库和调用库不是在同一解决方案中，首先要在样式库的属性页中勾选"Generate library layout”
引用代码：
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<ResourceDictionary>
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="ClassLibrary1/Styles/Custom.xaml" />
        <ResourceDictionary Source="ClassLibrary1/Styles/ButtonStyle.xaml"/>
        <ResourceDictionary Source="ClassLibrary1/Styles/ListsStyle.xaml"/>
    </ResourceDictionary.MergedDictionaries>
</ResourceDictionary>

或者

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<ResourceDictionary>
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="ms-appx:///ClassLibrary1/Styles/Custom.xaml" />
        <ResourceDictionary Source="ms-appx:///ClassLibrary1/Styles/ButtonStyle.xaml"/>
        <ResourceDictionary Source="ms-appx:///ClassLibrary1/Styles/ListsStyle.xaml"/>
    </ResourceDictionary.MergedDictionaries>
</ResourceDictionary>