Multiple actions were found that match the request Web API?

Question

I am using web API and i am new in this. I am stuck in a routing problem. I have a controller with following actions :

    // GET api/Ceremony
    public IEn         


        

Answer 1

Luckily nowadays with WEB API2 you can use Attribute Routing. Microsoft has gone open source on a big scale and then a wizard named Tim McCall contributed it from the community. So since somewhere end 2013, early 2014 you can add attributes like [Route("myroute")] on your WEB API methods. See below code example.

Still - as I just found out - you have to make sure to use System.Web.Http.Route and NOT System.Web.Mvc.Route. Otherwise you'll still get the error message Multiple actions were found that match the request.

using System.Web.Http;
...

[Route("getceremonies")]
[HttpGet]
// GET api/Ceremony
public IEnumerable<Ceremony> GetCeremonies()
{
    return db.Ceremonies.AsEnumerable();
}

[Route("getceremony")]
[HttpGet]
// GET api/Ceremony/5
public Ceremony GetCeremony(int id)
{
    Ceremony ceremony = db.Ceremonies.Find(id);
    return ceremony;
}

[Route("getfilteredceremonies")]
[HttpGet]
public IEnumerable<Ceremony> GetFilteredCeremonies(Search filter)
{
    return filter.Ceremonies();
}

Answer 2

I hope you are doing HttpGet while you invoke GetFilteredCeremonies(Search filter)

In that case, you cannot pass complex object in GET request like Search that you are passing.

If for some reason, you definitely want to get complex types in your get request, there are some work around. You may need to write a custom model binder and then set the attribute. please refer this article.