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Build actions

All files in a Visual Studio project have a build action. The build action controls what happens to the file when the project is compiled.

Set a build action

Visual Studio sets the build action based on the file type or the item template that was used to create it, but you can change it. To set the build action for a file, open the file's properties in the Properties window by selecting the file in Solution Explorer and pressing Alt+Enter. Or, right-click on the file in Solution Explorer and choose Properties. In the Properties window, under the Advanced section, use the drop-down list next to Build Action to set a build action for the file.

Build actions for a file in Visual Studio

Build action values

Some of the more common build actions for C# and Visual Basic project files are:

Build Action Project types Description
AdditionalFiles C#, Visual Basic A non-source text file that's passed to the C# or Visual Basic compiler as input. This build action is mainly used to provide inputs to analyzers that are referenced by a project to verify code quality. For more information, see Use additional files.
ApplicationDefinition WPF The file that defines your application. When you first create a project, this file is App.xaml.
CodeAnalysisDictionary .NET A custom word dictionary, used by Code Analysis for spell checking. See How to: Customize the Code Analysis Dictionary
Compile any The file is passed to the compiler as a source file.
Content .NET A file marked as Content can be retrieved as a stream by calling Application.GetContentStream. For ASP.NET projects, these files are included as part of the site when you deploy.
DesignData WPF Used for XAML viewmodel files, to enable user controls to be viewed at design time, with dummy types and sample data.
DesignDataWithDesignTimeCreateable WPF Like DesignData, but with actual types.
Embedded Resource .NET The file is passed to the compiler as a resource to be embedded in the assembly. You can call System.Reflection.Assembly.GetManifestResourceStream to read the file from the assembly.
EntityDeploy .NET For Entity Framework (EF) .edmx files that specify deployment of EF artifacts.
Fakes .NET Used for the Microsoft Fakes testing framework. See Isolate code under test using Microsoft Fakes
None any The file isn't part of the build in any way. This value can be used for documentation files such as "ReadMe" files, for example.
Page WPF Compile a XAML file to a binary .baml file for faster loading at run time.
Resource WPF Specifies to embed the file in an assembly manifest resource file with the extension .g.resources.
Shadow .NET Used for an .accessor file that contains a list of built assembly filenames, one per line. For each assembly on the list, generate public classes with the names ClassName_Accessor that are just like the originals, but with public methods instead of private methods. Used for unit testing.
Splash Screen WPF Specifies an image file to be displayed at run time when the app is starting up.
XamlAppDef Windows Workflow Foundation Instructs the build to build a workflow XAML file into an assembly with an embedded workflow.

Note

Additional build actions can be defined by for specific project types, so the list of build actions depends on the project type, and values might appear that are not in this list.

See also