Can I create all CRUD Operations in a Surface Controller in Umbraco?

So I was wondering if it is possible to use a Surface Controller for all crud operations (Umbraco V10). I know that I can create a Post method, but is it possible to add a Delete or Patch method?

I tried to add a method like this:

public class DeleteController : SurfaceController {
    [HttpDelete]
    public IActionResult Delete()
    {
        ...
    }
}

but I only receive an 405 error telling me that the method is not allowed. If I change the [HttpDelet] to [HttpPost] the method works, but I think that is semantically not correct if i delete content in a POST method.

And am I correct in saying that it is not common to have multiple methods in one Surface Controller? So I would have to create a Controller for each method.

You should be able to use your Surface Controller for different CRUD operations. Below is a sample code from the Umbraco CMS document.

Please take a look at this guide for more details.

Here is another old but useful approach.

PS: The attribute issue that you see could be a bug.You can check the existing Umbraco CMS issues here.

    namespace RoutingDocs.Controllers;
    ​
    public class MyController : SurfaceController
    {
        public MyController(
            IUmbracoContextAccessor umbracoContextAccessor,
            IUmbracoDatabaseFactory databaseFactory,
            ServiceContext services,
            AppCaches appCaches,
            IProfilingLogger profilingLogger,
            IPublishedUrlProvider publishedUrlProvider)
            : base(umbracoContextAccessor, databaseFactory, services, appCaches, profilingLogger, publishedUrlProvider)
        {
        }
    ​
        [HttpPost]
        [ValidateUmbracoFormRouteString]
        public IActionResult HandleSubmitMethod1()
        {
            return RedirectToCurrentUmbracoPage();
        }

        [HttpPost]
        [ValidateUmbracoFormRouteString]
        public IActionResult HandleSubmitMethod2()
        {
           return Content("Hello Postback");
        }
    }