Attribute Routing: "Not a valid ODataPath Template"

Question

Ive been struggling with this all day and i think ive reached the end of all the answers ive seen on this. Maybe im special, or maybe im doing something stupid. I recently upgraded from V3 to V4 (i think). Im using the System.Web.OData namespace which should be fine.

Here is my WebAPIConfig

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Http;
using System.Web.OData.Builder;
using System.Web.OData.Extensions;
using System.Web.OData.Routing;
using System.Web.OData.Routing.Conventions;

using GizmoAPI.Models;
namespace GizmoAPI
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );

            ODataModelBuilder builder = new ODataConventionModelBuilder();
            builder.EntitySet<Counterparty>("Counterparties");

            config.Select().Expand().Filter().OrderBy().MaxTop(null).Count();
            config.EnableDependencyInjection();
            config.MapHttpAttributeRoutes();

            config.MapODataServiceRoute("odata", "odata",     builder.GetEdmModel());
            config.AddODataQueryFilter();
            var cors = new     System.Web.Http.Cors.EnableCorsAttribute("http://localhost:56248", "*", "*");
            config.EnableCors( cors);
         config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new             System.Net.Http.Headers.MediaTypeHeaderValue("text/html"));
            config.EnableSystemDiagnosticsTracing();
        }
    }
}

and here is a basic controller:

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Web.Http.ModelBinding;
using System.Web.OData;
using System.Web.OData.Routing;
using GizmoAPI.Models;

namespace GizmoAPI.Controllers
{
public class CounterpartiesController : ODataController
{
    private GizmoEntities db = new GizmoEntities();

    // GET odata/Counterparties
    [EnableQuery]
    public IQueryable<Counterparty> GetCounterparties()
    {
        return db.Counterparties;
    }

    // GET odata/Counterparties(5)
    [EnableQuery]
    [ODataRoute("{key}")]
    public SingleResult<Counterparty> GetCounterparty([FromODataUri] int key)
    {
        return SingleResult.Create(db.Counterparties.Where(counterparty => counterparty.CounterpartyID == key));
    }

Then im trying to call the URL as http://localhost:60965/odata/Counterparties/101 or http://localhost:60965/odata/101

or really anything at this point. I feel like there is some sort of configuration that im missing to activate it. I get the error "The path template '{key}' on the action 'GetCounterparty' in controller 'Counterparties' is not a valid OData path template. Resource not found for the segment '{key}'."

Ravi Sanker Ravi Sanker · Accepted Answer · 2017-03-12T07:51:42

Did you try renaming your method to GetCounterParties([FromODataUri] int key) and removing the OdataRoute Attribute?

Attribute Routing: "Not a valid ODataPath Template"

2 Answers