Fix S6934 FP: Abstract Controller base class

[zsolt-kolbay-sonarsource]

Description

S6934 raises an issue when the Route attribute isn't added to an abstract Controller class (but it's added to one or more of its action methods). This shouldn't happen, as the action method will always be accessed through a non-abstract derived rather than the abstract base class, so the Route attribute only needs to be applied there.

Repro steps

public abstract class BaseController : Controller   // Noncompliant - FP: shouldn't raise on abstract classes
{
    [HttpGet]
    [Route("list")]
    public IActionResult List()                     // Secondary
    {
        // ... load and return items
        return View();
    }
}

[Route("/api/user")]
public sealed class UserController : BaseController
{
    // other controller code
}

Expected behavior

The rule should not raise an issue on the abstract class.

Actual behavior

The rule raises an issue on the abstract Controller class.

Related information

• C#/VB.NET Plugins version: 9.24
• Visual Studio version: Visual Studio 2022 (17.9.6)
• Operating System: Windows 10