Not supported by Swagger 2.0: Multiple operations with path

Question

I have integrated swagger in WebApi 2 application. It works fine when application has single controller. When I added second controller in the application. I got following

Answer 1

Add route attribute for the method [Route("ApiAnotherFunction")] and [HttpGet].

Answer 2

The problem can also occur in a situation where you use attribute routing.

If the attribute route conflicts with a routingtable route you will have the 'multiple operations' error.

Example:

[HttpGet]
[SwaggerOperation("GetByUsername")]
[Route("[path]/User")]
public IHttpActionResult GetUser(string username)
{

}

more info on attribute routing: https://docs.microsoft.com/en-us/aspnet/web-api/overview/web-api-routing-and-actions/attribute-routing-in-web-api-2

Answer 3

In the file AppStart/SwaggerConfig.cs

First one, you must import Linq

using System.Linq;

And add in the same file, this line

c.ResolveConflictingActions(apiDescriptions => apiDescriptions.First());

just inside of:

GlobalConfiguration.Configuration 
                .EnableSwagger(c =>
                    { ...

One consideration: In your controllers, you must use the Http methods :

[HttpGet]
[Route("something")]
public List<model> something(){....}

[HttpGet]
[Route("something2")]
public List<model2> something2(){....}

[HttpPost]
[Route("mypost1")]
public List<model> mypost1(){....}

[HttpPost]
[Route("mypost2")]
public List<model2> mypost2(){....}

Answer 4

An answer I haven't seen: I bungled up usings.

My controller has some MVC items (List items) and thus has a link:

using System.Web.Http;
using System.Web.Mvc;

Because of this, somehow, it got registered twice (I assume). Problem was fixed by using the full qualification for RoutePrefix/Route/HttpGet and others.

namespace MyNameSpace
{
    [System.Web.Http.RoutePrefix("api/Reports")]
    public class ReportsController
    {
        {...constructor...}

        [System.Web.Http.Route("Scans")]
        [System.Web.Http.HttpGet,ResponseType(typeof(List<ReportClass>))]
        public ascyn Task<HttpResponseMessage> GetScans() {...}

Answer 5

You have two options for the above two methods:

1. Combine two methods into single one with three parameters - each one will be in the query string

2. Have separate route urls like - api/controller/byusername and api/controller/bycredentials

Answer 6

You can change the route on your controller.

The default value is [Route("api/[controller]")]

You can change to [Route("api/[controller]/[action]")]