WEB API Routing Error Multiple actions were found that match the request with different API paths

Question

I'm implementing web API MVC in c#. My snippet implementation is: - WebApiConfig.cs

config.Routes.MapHttpRoute( name: "getMultiProbe", routeTemplate: "api/v1/{controller}/probe/{server}" ); config.Routes.MapHttpRoute( name: "getCurrentMultiProbe", routeTemplate: "api/v1/{controller}/currentmultiprobe/{server}" );

And controller associated with the methods that generate the issue are: - HistController.cs

[HttpPost] public Dictionary<string, List<DataSample>> getMultiProbe(string server, [FromBody] Dictionary<string,Object> request) { Debug.WriteLine("ENTER [GetMultiProbe] "+ request["from"] + " - mode: " + request["mode"]); string[] tagnames = (string [])request["tagnames"]; return null; } [HttpPost] public Dictionary<string, Object[]> getCurrentMultiProbe(string server, [FromBody] String[] tagnames) { Debug.WriteLine("ENTER [getCurrentMultiProbe] server: " + server + " - tagnames: " + tagnames); return null; }

from rest client return the error:

{"Message": "An error has occurred.","ExceptionMessage": "Multiple actions were found that match the request: getMultiProbe on type HistService.Controllers.HistController getCurrentMultiProbe on type HistService.Controllers.HistController", "ExceptionType": "System.InvalidOperationException", "StackTrace": " at System.Web.Http.Controllers.ApiControllerActionSelector.ActionSelectorCacheItem.SelectAction(HttpControllerContext controllerContext) at System.Web.Http.Controllers.ApiControllerActionSelector.SelectAction(HttpControllerContext controllerContext) at System.Web.Http.ApiController.ExecuteAsync(HttpControllerContext controllerContext, CancellationToken cancellationToken) at System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext()" }

I wouldn't have to match the different paths, because the paths differ on /currentmultiprobe and /probe. I tried to change the name input parameter between paths and the service works. I ask if there is a way to work this configuration.

Is this going to map to any other controller? If not then narrow the scope by using defaults. — Nkosi
– Nkosi, Commented Feb 8, 2017 at 10:29

Nkosi · Accepted Answer · 2017-02-08 10:37:39Z

The reason for the error in OP is that the routing table could not differentiate between the two action based on the route parameters in the template and that both action have the same HTTP Method (POST)

Narrow the mapping (route) by using defaults parameter when mapping.

config.Routes.MapHttpRoute( name: "getMultiProbe", routeTemplate: "api/v1/{controller}/probe/{server}", defaults: { controller = "Hist", action = "getMultiProbe" } ); config.Routes.MapHttpRoute( name: "getCurrentMultiProbe", routeTemplate: "api/v1/{controller}/currentmultiprobe/{server}", defaults: { controller = "Hist", action = "getCurrentMultiProbe" } );

WujoWojtas · Accepted Answer · 2017-02-08 10:47:21Z

You can use one route declaration with {action}

config.Routes.MapHttpRoute( name: "ActionRoute", routeTemplate: "api/v1/{controller}/{action}/{server}" );

and use it in your controller in that way

[HttpPost] [ActionName("probe")] public Dictionary<string, List<DataSample>> getMultiProbe(string server, [FromBody] Dictionary<string,Object> request) { Debug.WriteLine("ENTER [GetMultiProbe] "+ request["from"] + " - mode: " + request["mode"]); string[] tagnames = (string [])request["tagnames"]; return null; } [HttpPost] [ActionName("currentmultiprobe")] public Dictionary<string, Object[]> getCurrentMultiProbe(string server, [FromBody] String[] tagnames) { Debug.WriteLine("ENTER [getCurrentMultiProbe] server: " + server + " - tagnames: " + tagnames); return null; }

saved my time. Adding "{controller}/{action}/{id}" on webapiconfig resolved my issue.

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