Add AddControllersAsServices documentation to DI into controllers article

[Copilot]

The dependency injection into controllers article had no mention of AddControllersAsServices(), leaving readers without guidance on how to register controllers as DI-managed services.

Changes

• All version ranges: Added a "Controllers as services" section explaining:

  • Default behavior (controllers are not registered as services; DefaultControllerActivator handles instantiation)
  • When and why to call AddControllersAsServices()
  • Benefits: custom IControllerActivator, DI-managed lifetimes, container-driven constructor selection
  • Note to configure ApplicationPartManager before calling AddControllersAsServices()

• >= aspnetcore-8.0 (dependency-injection.md): Uses minimal hosting model style:

  builder.Services.AddControllersWithViews().AddControllersAsServices();

• >= aspnetcore-3.0 < aspnetcore-8.0 (dependency-injection7.md): Uses Startup.ConfigureServices with AddControllersWithViews()

• < aspnetcore-3.0 (dependency-injection7.md): Uses Startup.ConfigureServices with AddMvc()

Original prompt

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This section details on the original issue you should resolve

<issue_title>Call AddControllersAsServices() to configure constructors</issue_title>
<issue_description>Highly suggest adding a mention of services.AddMvc().AddControllersAsServices(); for those who want to configure which (and how) controller constructor is used.

@Rick-Anderson edit: 7.6K PV/month

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Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: 08d2cf2e-55fb-33a4-b1d4-c97b2d531741
• Version Independent ID: f9a790d8-f25b-0e1d-eb63-c8ed3ac518cf
• Content: Dependency injection into controllers in ASP.NET Core
• Content Source: aspnetcore/mvc/controllers/dependency-injection.md
• Service: unspecified
• GitHub Login: @ardalis
• Microsoft Alias: riande</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Call AddControllersAsServices() to configure constructors #6255

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Internal previews

📄 File	🔗 Preview link
aspnetcore/mvc/controllers/dependency-injection.md	Dependency injection into controllers in ASP.NET Core

[Copilot]

Pull request overview

Adds guidance to the “Dependency injection into controllers” documentation explaining how and why to use AddControllersAsServices() so controllers are created via the DI container.

Changes:

• Added a “Controllers as services” section describing default controller activation and when to call AddControllersAsServices.
• Added version-appropriate configuration snippets for minimal hosting (>= aspnetcore-8.0) and Startup.ConfigureServices (older versions).
• Updated ms.date in the main article.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
aspnetcore/mvc/controllers/dependency-injection.md	Adds the new “Controllers as services” section for >= aspnetcore-8.0 and updates metadata.
aspnetcore/mvc/controllers/includes/dependency-injection7.md	Adds the same “Controllers as services” section for older moniker ranges with appropriate Startup/AddMvc examples.

[wadepickett]

Looks good. Approved. I wasn not finding any issues. However ,I added a suggestion for ai-usage: ai-assisted to the parent topic since it did not have one yet and needed one which you can choose to commit.

[meaghanlewis]

Thanks Wade!