Route attribute routing with query strings when there are multiple routes

Question

I have this:

[HttpGet]
[Route(\"Cats\")]
public IHttpActionResult GetByCatId(int catId)

[HttpGet]
[Route(\"Cats\")]
public IHttpActionResult GetByName(strin         


        

Answer 1

You can merge the two actions in question into one

[HttpGet]
[Route("Cats")]
public IHttpActionResult GetCats(int? catId = null, string name = null) {

    if(catId.HasValue) return GetByCatId(catId.Value);

    if(!string.IsNullOrEmpty(name)) return GetByName(name);

    return GetAllCats();
}

private IHttpActionResult GetAllCats() { ... }

private IHttpActionResult GetByCatId(int catId) { ... }    

private IHttpActionResult GetByName(string name) { ... }

Or for more flexibility try route constraints

Referencing Attribute Routing in ASP.NET Web API 2 : Route Constraints

Route Constraints

Route constraints let you restrict how the parameters in the route template are matched. The general syntax is "{parameter:constraint}". For example:

[Route("users/{id:int}"]
public User GetUserById(int id) { ... }

[Route("users/{name}"]
public User GetUserByName(string name) { ... }

Here, the first route will only be selected if the "id" segment of the URI is an integer. Otherwise, the second route will be chosen.

Answer 2

Try applying constraints on attribute routing.

[HttpGet]
[Route("Cats/{catId:int}")]
public IHttpActionResult GetByCatId(int catId)

[HttpGet]
[Route("Cats/{name}")]
public IHttpActionResult GetByName(string name)