How do I add a new action to a class that inherits from an MVC controller

Question

I've got a .Net Core (3.1) MVC application, and I'm trying to add a new action to a controller. However, given the architecture of this solution, I'm very limited to what I can change.

Essentially I have an MVC controller, and a class that inherits from this controller that overrides some of the existing actions. That's working fine, but I need to add a new action to this inherited controller, and I cannot find how to set the route up for it.

My main controller is:

public class HomeController : Controller { [HttpGet] public virtual IActionResult Index() { return Json(new { Success = true, Message = "Called HomeController.Index" }); } }

My derived class is:

public class HomeControllerExtended : HomeController { public override IActionResult Index() { return Json(new { Success = true, Message = "Called HomeControllerExtended.Index" }); } [HttpGet] public IActionResult DoThis() { return Json(new { Success = true, Message = "Called DoThis" }); } }

Accessing /Home/Index returns the JSON with the 'Called HomeControllerExtended.Index' message, which is expected. However, accessing /Home/DoThis results in 404.

I've tried a few ways of adding a new route in Startup.cs, but none make any difference. For example:

app.UseEndpoints(endpoints => { endpoints.MapControllerRoute( name: "default", pattern: "{controller=Home}/{action=Index}/{id?}"); endpoints.MapControllerRoute( name: "DoThis", pattern: "{controller=Home}/{action=DoThis}"); });

But this makes no difference.

Firstly, is it possible for new actions to be added like this? And if so, how do I configure the routing to find the new action?

Note that I cannot change HomeController at all, and the new action needs to be able to access the protected methods on HomeController.

Attach the route attribute at DoThis action as [Route(“Home/DoThis”)]. — user1672994
– user1672994, Commented Jan 15, 2021 at 11:52
@user1672994 Of course! Thank you, yes, that did the trick. I knew it'd be something really straight-forward. — Jamie Burns
– Jamie Burns, Commented Jan 15, 2021 at 11:54

user1672994 · Accepted Answer · 2021-01-15 11:57:06Z

You can attach the route attribute over DoThis action as shown below

[Route("Home/DoThis")] [HttpGet] public IActionResult DoThis() { return Json(new { Success = true, Message = "Called DoThis" }); }

With above now you can access the DoThis action using /Home/DoThis path.

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