Web API - Multiple parameters as /param1/param2/param3/ not working

Question

I have a an ASP.NET Web API project where I have a single method in my controller as such ..

public IHttpActionResult MyMethod(int param1, int param2, int param3)
{
  var theSum = param1 + param2 + param3;
  return Ok(theSum);
}

I have the following route in RouteConfig.cs

routes.MapRoute(
  name: "MyRoute",
  url: "api/{controller}/{action}/{param1}/{param2}/{param3}",
  defaults: new { controller = "MyController", action = "MyRoute", param1 = UrlParameter.Optional, param2 = UrlParameter.Optional, param3 = UrlParameter.Optional }
  );

When I call the API with the following URL everything works as expected ..

http://localhost/api/mycontroller/mymethod?param1=2&param2=4&param3=6

Yet when I try to call the API as follows I get a 404 - The resource cannot be found error.

http://localhost/api/mycontroller/mymethod/2/4/6/

any idea why? I thought I had the route setup properly and since the parameters are .NET primitives I though I could pass them as param1/param2/param3

Your Action = "MyRoute" I believe should be Action = "MyMethod" — Lazy Coder
– Lazy Coder, Commented Dec 14, 2015 at 22:09

Lazy Coder · Accepted Answer · 2015-12-14 22:05:19Z

2

Are you using MVC5? If so I'd suggest using the Route() attribute instead the routes collection, for me at least it is easier to manage. I was able to get this working with your sample using that approach.

[Route("api/values/MyMethod/{param1}/{param2}/{param3}")]
[HttpGet]
public IHttpActionResult MyMethod(int param1, int param2, int param3)
{
    var theSum = param1 + param2 + param3;
    return Ok(theSum);
}

And then calling it via http://localhost/api/values/mymethod/2/4/6 properly returned 12.

answered Dec 14, 2015 at 22:05

Lazy Coder

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5 Comments

webworm Over a year ago

By using the Route attribute would I remove the entry for "MyRoute" in the RouteConfig.cs?

Lazy Coder Over a year ago

Yeah, remove that and just decorate the methods with your attribute

webworm Over a year ago

That worked! Thanks a bunch! Interesting why the route configuration in Route.Config did not work.

Lazy Coder Over a year ago

I think that has to do with there being 2 route configs - one for MVC style and one for WebAPI, I think you were pushing your config into the MVC route collections (RouteConfig.cs) instead of the WebApiConfig.cs

Lazy Coder Over a year ago

If you add something like config.Routes.MapHttpRoute( name: "MyRoute", routeTemplate: "api/values/mymethod/{param1}/{param2}/{param3}", defaults: new { controller = "Values", action = "MyMethod" } ); to the WebApiConfig and let your controller know to expect a GET [HttpGet] attribute then it should also work

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