Multiple actions were found that match the request in asp.net web api

Question

I working on "Code Camper" sample SPA application. I am running the app on VS 2010 with MVC 4 installed. But I ran into problem with LookupsController.

Here is the error I got:

    "exceptionMessage":"Multiple actions were found that match the request: \r\nSystem.Collections.Generic.IEnumerable`1[CodeCamper.Model.Room] GetRooms() on type
 CodeCamper.Controllers.LookupsController\r\nSystem.Collections.Generic.IEnumerable`1[CodeC
amper.Model.TimeSlot] GetTimeSlots() on type 
CodeCamper.Controllers.LookupsController","exceptionType":"System.InvalidOperationException
","stackTrace":"   at System.Web.Http.Controllers.ApiControllerActionSelector.ActionSelectorCacheItem.SelectActio
n(HttpControllerContext controllerContext)\r\n   at 
System.Web.Http.Controllers.ApiControllerActionSelector.SelectAction(HttpControllerContext 
controllerContext)\r\n   at 
System.Web.Http.ApiController.ExecuteAsync(HttpControllerContext controllerContext, 
CancellationToken cancellationToken)\r\n   at 
System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsyncInternal(HttpRequestMessage 
request, CancellationToken cancellationToken)\r\n   at 
System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request, 
CancellationToken cancellationToken)"

Well, do you have multiple methods with the same (action) name? — Matti Virkkunen
– Matti Virkkunen, Commented Dec 31, 2012 at 17:01
No I just have my controller like this (github.com/obkalu/SPA-CodeCamper/blob/master/CodeCamper/…) — Babak Fakhriloo
– Babak Fakhriloo, Commented Dec 31, 2012 at 17:04
Is you route config idential to this? github.com/obkalu/SPA-CodeCamper/blob/master/CodeCamper/… It looks like your request is somehow matching the non action route and finding two methods with the prefix GET and erroring. Have you kept the route constraint in for ID? 'constraints: new { id = @"^\d+$" } // id must be all digits' — Mark Jones
– Mark Jones, Commented Jan 2, 2013 at 11:17
@MarkJones, yes the route config is same as the source code... — Babak Fakhriloo
– Babak Fakhriloo, Commented Jan 2, 2013 at 18:47

Babak Fakhriloo · Accepted Answer · 2013-01-03 14:17:38Z

3

I found the answer!

When you create a web api project, by default there is this line of code in global.asax.cs

WebApiConfig.Register(GlobalConfiguration.Configuration);

I removed it (as I saw from source code of codecamper) and now there is no problem any more! but I dont know why exatly

answered Jan 3, 2013 at 14:17

Babak Fakhriloo

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3 Comments

Mark Jones Over a year ago

WebApiConfig.Register (in App_Start) would have registered the routes again, more to the point it would have registered the standard route config which left unaltered (from the template default) looks for {controller} but not action and therefore uses the method naming convention. If that route Won the race it would have have multiple actions beginning with the word Get and given you your error.

Babak Fakhriloo Over a year ago

tnx @MarkJones for your description.

Henley Wing Chiu Over a year ago

@MarkJones This worked for me too... so u're saying the routes config maps the route to a controller method, and WebApiConfig does the same thing, and if the 2 conflict, you get an error?

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