web api multiple post methods with different parameter type

Question

Can I have 2 post methods with different datatypes as below :-

[HttpPost]        
public HttpResponseMessage Post([StringBody]string data)
{
   // Logic
}

[HttpPost]
public HttpResponseMessage Post(Requirements objRequirement)
{ 
  //Logic
}

I am getting below error in postman :-

<Error>
    <Message>An error has occurred.</Message>
    <ExceptionMessage>Multiple actions were found that match the request: 
System.Net.Http.HttpResponseMessage Post(Newtonsoft.Json.Linq.JObject) on type ATL.Trebuchet.RestApi.Controllers.ValuesController
System.Net.Http.HttpResponseMessage Post(ATL.Trebuchet.RestApi.Models.Requirements) on type ATL.Trebuchet.RestApi.Controllers.ValuesController</ExceptionMessage>
    <ExceptionType>System.InvalidOperationException</ExceptionType>
    <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.SendAsyncInternal(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)</StackTrace>
</Error>

Please help how can have same Post method with different type of parameters

I am sending data as Text (text/plain)

EDIT 1 :

Community · Accepted Answer · 2017-05-23 10:30:16Z

5

If you want to use multiple post method in the same controller you need to map them to different routes or actions

For Web api 1

Add the route to the WebApiConfig, You can look this answer for details but the important thing is to specify that the default route api/controller/id only accepts integers. Else the actions will be treated as string ids.

routes.MapHttpRoute(
    name: "ControllerAndId",
    routeTemplate: "api/{controller}/{id}",
    defaults: null,
    constraints: new { id = @"^\d+$" } // Only integers 
);
routes.MapHttpRoute(
    name: "ActionApi",
    routeTemplate: "api/{controller}/{action}"
);

Then in the controller specify the action ontop of the method

public class DataController : ApiController
{
    [HttpPost]  
    [ActionName("post1")]      
    public HttpResponseMessage Post([StringBody]string data)
    {
       // Logic
    }

    [HttpPost]
    [ActionName("post2")]
    public HttpResponseMessage Post(Requirements objRequirement)
    { 
      //Logic
    }
}

For Web api 2

Here you can use Attribute Routing

[RoutePrefix("api/data")]
public class DataController : ApiController
{
    [HttpPost]  
    [Route("post1")]      
    public HttpResponseMessage Post([StringBody]string data)
    {
       // Logic
    }

    [HttpPost]
    [Route("post2")]
    public HttpResponseMessage Post(Requirements objRequirement)
    { 
      //Logic
    }
}

The first post method will be called as api/data/post1 and the second api/data/post2

edited May 23, 2017 at 10:30

CommunityBot

11 silver badge

answered Nov 25, 2016 at 8:41

Marcus Höglund

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8 Comments

C Sharper Over a year ago

Not supporting routePrefix .. its telling me to add new class.. see edit1

C Sharper Over a year ago

Generate class for Route : same thing for [Route("")]

Marcus Höglund Over a year ago

sorry, Didnt see you were using web api 1. In web api 2 you can use attribute routing which my solution is based on

C Sharper Over a year ago

Is there any solution for Web api 1 ??

C Sharper Over a year ago

same error with url :- localhost:57578/api/Values/PostString Note:- PostString :- ActionName > [ActionName("PostString")]

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