使用字典Source的相对路径表示法

<ResourceDictionary.MergedDictionaries>

    <ResourceDictionary Source="/SLDynamicThemes2;component/Assets/Themes/AccentColor/CoreStyles.xaml" />

    <ResourceDictionary Source="/SLDynamicThemes2;component/Assets/Themes/AccentColor/SDKStyles.xaml" />

    <ResourceDictionary Source="/MindTouch.Tms.Controls.Wpf;component/Themes/Default/DefaultResources.xaml"/>

</ResourceDictionary.MergedDictionaries>

 "/MindTouch.Tms.Controls.Wpf;component/"代表程序集名称（根目录），路径分隔符要用斜杠‘/’。