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通常我们在类库中定义资源的时候可以在Theme/Generic.xaml中定义，当类库加载的时候，会自动加载Generic.xaml文件中的资源，通常用在控件库中，但如果控件多了之后，所有的Style都定义在Generic.xaml中会是的文件很大很臃肿，这时候我们可以通过Uri的方式引用外部的资源，把资源定义在多个文件中，可以更方便于管理，在程序集中定义引用外部ResourceDictionary比较特殊，方法如下
WinRT:
ms-appx:///{ASSEMBLY_NAME}/{RESOURCE_FILE_PATH}
如：ms-appx:///Contoso.Core/Resources/CoreStyles.xaml
Sliverlight
/{ASSEMBLY_NAME};component/{RESOURCE_FILE_PATH}
如：/Contoso.Core;component/Resources/CoreStyles.xaml
下面为完整Demo
1、WinRT
<Application x:Class="Contoso.UI.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <!--Application Resources--> <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="ms-appx:///Contoso.Core/Resources/CoreStyles.xaml" /> <ResourceDictionary Source="ms-appx:///Contoso.UI.Core/Resources/UICoreStyles.xaml" /> </ResourceDictionary.MergedDictionaries> <!-- Other style definitions can still go here --> <Style TargetType="Button"> </Style> </ResourceDictionary> </Application.Resources> </Application>
2、Silverlight
<Application x:Class="Contoso.UI.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"> <!--Application Resources--> <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/Contoso.Core;component/Resources/CoreStyles.xaml"/> <ResourceDictionary Source="/Contoso.UI.Core;component/Resources/UICoreStyles.xaml"/> </ResourceDictionary.MergedDictionaries> <!-- Other style definitions can still go here --> <Style TargetType="Button"> </Style> </ResourceDictionary> </Application.Resources> <Application.ApplicationLifetimeObjects> <!--Required object that handles lifetime events for the application--> <shell:PhoneApplicationService Launching="Application_Launching" Closing="Application_Closing" Activated="Application_Activated" Deactivated="Application_Deactivated"/> </Application.ApplicationLifetimeObjects> </Application>
参考链接：
【UWP】在不同类库使用ResourceDictionaries
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原文地址：http://www.cnblogs.com/bomo/p/5158743.html
