How To Get Url Parameter Routing Working in ASP.NET Core

Question

The default routing for my ASP.NET Core is as defaulted by VS2015 to be:

routes.MapRoute(
   name: "default",
   template: "{controller=Home}/{action=Index}/{id?}");

When I make my request URL /my-controller/my-special-view it indeed calls the method in my my-control that is defined as follows with the id parameter equal to my-special-value

public IActionResult my-controller(string id) {...

I'm trying to the same thing with attribute routing. I define the attribute as follows:

[Route("my-controller/{id}")]
public IActionResult my-controller(string id) {...

I get an error as follows:

InvalidOperationException: The constraint entry 'attributeOfInterest' - 'string' on the route 'CacheTagHelper/{attributeOfInterest:string}' could not be resolved by the constraint resolver of type 'DefaultInlineConstraintResolver'.

I'm not experienced with attritube routing and do not understand why the above to controller methods don't give me the same results.

Answer 1

The default routing template is {controller=Home}/{action=Index}/{id?} so you can follow the template in your controller action

the my-controller will be your inherited class from controller class and the IActionResult match with your action method, if you specific the attribute in your put to route the {Id} , in your method parameter should also specific the {Id}, in routing, you also need to specific the http verb actions(GET,POST, PUT etc)

in your case would be

public class my-controller : Controller
{
   [HttpGet("{id}")]
   public IActionResult my-special-view(String id) { ... }
}