Question

Can somebody explain me one thing.

I have two methods in my controller :


public ActionResult AddPredefinedTicket(int customerId) {...}


and


public ActionResult AddPredefinedTicket(int customerId, TicketTypes type, string additionalJsonParameters) {...} (here TicketTypes is enum)


I’m tring to make a call with using URL like


http://.../Ticket/AddPredefinedTicket?customerId=1082


For some reason i got an exception :


The current request for action 'AddPredefinedTicket' on controller type 'TicketController' is ambiguous between the following action methods:
System.Web.Mvc.ActionResult AddPredefinedTicket(Int32) on type CallCenter.CustomerService.Controllers.TicketController
System.Web.Mvc.ActionResult AddPredefinedTicket(Int32, CallCenter.CustomerService.Data.Models.TicketTypes, System.String) on type CallCenter.CustomerService.Controllers.TicketController


But, i don’t understand why MVC think that the request is ambiguous.
As you can see from my URL call, i’m not passing neither ‘type’ or ‘additionalJsonParameters’ parameters.
I understand, that additionalJsonParameters is string, so it can be null.

But the action also has “type” parameter, that is enum and can’t be null.

In my oppinion, MVC should use first action, but it don’t.

Can you explain why ?

Answer 1

you cannot overload your ActionResults.

“There are some additional requirements that must be satisfied by a controller action. A method used as a controller action cannot be overloaded. Furthermore, a controller action cannot be a static method. Other than that, you can use just about any method as a controller action.“

See : http://www.asp.net/Learn/mvc/tutorial-03-cs.aspx