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

Question

I have added WebApi to an existing MVC app and create a controller with a post method. I have one route configured in the webapiconfig. When I use Fiddler to post to the controller, I am receiving the "Multiple Actions" error. my ApiConfig and Controller are posted below. There is some Ioc and DI going on with Ninject. Do I need to add different routes definitions, or is this about the data being posted?
webapiconfig.cs
public static void Register(HttpConfiguration config)
{
var jsonFormatter = config.Formatters.OfType<JsonMediaTypeFormatter>().First();
jsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
config.Routes.MapHttpRoute(
name: "Materials",
routeTemplate: "api/materials/{id}",
defaults: new { controller = "materials", id = RouteParameter.Optional }
);
}
MaterialController.
using ????.Info.DAL;
using ????.Info.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using IdentitySample.Models;
namespace ????.Info.Controllers.Api
{
public class MaterialsController : BaseApiController
{
public MaterialsController(I????Repository repo)
:base(repo)
{
}
[Route("api/materials/")]
public IEnumerable<MaterialModel> Get()
{
IQueryable<MaterialEntities.Materials> query;
query = TheRepository.GetAllMaterials();
var results = query
.ToList()
.Select(s => TheModelFactory.Create(s));
return results;
}
[Route("api/materials/{id:int}")]
public HttpResponseMessage GetMaterial(int id)
{
try
{
var material = TheRepository.GetMaterial(id);
if (material != null)
{
return Request.CreateResponse(HttpStatusCode.OK, TheModelFactory.Create(material));
}
else
{
return Request.CreateResponse(HttpStatusCode.NotFound);
}
}
catch (Exception ex)
{
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ex);
}
}
[HttpPost]
public HttpResponseMessage Post([FromBody] MaterialModel materialModel)
{
try
{
var entity = TheModelFactory.Parse(materialModel);
if (entity == null) Request.CreateErrorResponse(HttpStatusCode.BadRequest, "Could not read MaterialType/Organization from body");
if (TheRepository.Insert(entity) && TheRepository.SaveAll())
{
return Request.CreateResponse(HttpStatusCode.Created, TheModelFactory.Create(entity));
}
else
{
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, "Could not save to the database.");
}
}
catch (Exception ex)
{
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ex);
}
}
public MaterialEntities.Materials Parse(MaterialModel materialmodel)
{
try
{
var material = new MaterialEntities.Materials()
{
Name = materialmodel.Name,
Description = materialmodel.Description,
DateCreated = materialmodel.DateCreated,
};
return material;
}
catch (Exception)
{
return null;
}
}
}
}

Answer 1

Ok, thanks for all the help on this. This was fixed by adding config.MapHttpAttributeRoutes(); to the WebApiConfig. I removed the default route definitions since I am going to use AttributeRouting and it's working now.
update: It looks like it is possible to mix Attribute and Convention routing in the WebApiConfig as discussed here So my problem was solved by adding config.MapHttpAttributeRoutes(); to WebApiConfig