解决方案下的所有文件都有Build Action和Copy to Output Directory这2个属性，二者是独立无关的，前者决定在编译时编译器如何处理文件，后者仅单纯的决定是否将文件也拷贝一份到输出目录。
Build Action
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None: The file is not included in the project output group and is not compiled in the build process. An example is a text file that contains documentation, such as a Readme file.
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Compile: The file is compiled into the build output. This setting is used for code files.
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Content: Allows you to retrieve a file (in the same directory as the assembly) as a stream via Application.GetContentStream(URI). For this method to work, it needs a AssemblyAssociatedContentFile custom attribute which Visual Studio graciously adds when you mark a file as "Content"
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Embedded resource: Embeds the file in an exclusive assembly manifest resource.
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Resource (WPF only): Embeds the file in a shared (by all files in the assembly with similar setting) assembly manifest resource named AppName.g.resources.
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Page (WPF only): Used to compile a xaml file into baml. The baml is then embedded with the same technique as Resource (i.e. available as `AppName.g.resources)
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ApplicationDefinition (WPF only): Mark the XAML/class file that defines your application. You specify the code-behind with the x:Class="Namespace.ClassName" and set the startup form/page with StartupUri="Window1.xaml"
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SplashScreen (WPF only): An image that is marked as SplashScreen is shown automatically when an WPF application loads, and then fades
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DesignData: Compiles XAML viewmodels so that usercontrols can be previewed with sample data in Visual Studio (uses mock types)
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DesignDataWithDesignTimeCreatableTypes: Compiles XAML viewmodels so that usercontrols can be previewed with sample data in Visual Studio (uses actual types)
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EntityDeploy: (Entity Framework): used to deploy the Entity Framework artifacts
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CodeAnalysisDictionary: An XML file containing custom word dictionary for spelling rules
Copy to Output Directory
- Do not copy
- Copy always
- Copy if newer