使用MergedDictionaries(UWP)拆分generic.xaml文件的正确语法是什么

<resourceDictionary.MergedDictionaries>
    <resourceDictionary source="<url_Syntax_file_1>" />
    <resourceDictionary source="<url_Syntax_file_2>" />
</resourceDictionary.MergedDictionaries>

解决方案资源管理器(以及文件系统)中的文件夹结构如下所示：

> MyCustomcatontrolsProject(项目/文件夹)

>主题(文件夹)

> Generic.xaml(文件)
> ControlTemplates(文件夹)

> MyControl1.xaml(文件)
> MyControl2.xaml(文件)

在过去,我使用以下语法在Silverlight和Silverlight for Win Phone中执行此操作：

<resourceDictionary.MergedDictionaries>
    <resourceDictionary source="/MyCustomcatontrolsProject;Component/Themes/ControlTemplates/MyControl1.xaml"/>
    <resourceDictionary source="/MyCustomcatontrolsProject;Component/Themes/ControlTemplates/MyControl2.xaml"/>
</resourceDictionary.MergedDictionaries>

对于使用此语法的Windows Phone 8.1：

<resourceDictionary.MergedDictionaries>
    <resourceDictionary source="ms-appx:///Themes/ControlTemplates/MyControl1.xaml" />
    <resourceDictionary source="ms-appx:///Themes/ControlTemplates/MyControl2.xaml" />
</resourceDictionary.MergedDictionaries>

这些语法都不适用于Win 10(UWp).尝试使用这些会导致运行时异常：

An exception of type 'WindowS.UI.Xaml.Markup.XamlParseException' occurred in MyApplication.exe but was not handled in user code
WinRT information: Failed to assign to property 'WindowS.UI.Xaml.resourceDictionary.source' because the type 'Windows.Foundation.@R_801_10495@ng' cAnnot be assigned to the type 'Windows.Foundation.Uri'.

我也试过这种语法导致了同样的异常：

<resourceDictionary.MergedDictionaries>
    <resourceDictionary source="ControlTemplates/MyControl1.xaml" />
    <resourceDictionary source="ControlTemplates/MyControl2.xaml" />
</resourceDictionary.MergedDictionaries>

有趣的是,似乎app.xaml使用上面的语法没有问题.

有没有人知道generic.xaml中resourceDictionary节点中source属性中url字符串的正确语法？或者这是UWP没有赶上的东西吗？