I am trying to use Autofac with my Umbraco 7 MVC Project (.NET Framework 4.5.2).

I have installed Autofac.Mvc5 and Autofac.WebApi2.

I have configured Dependency Injection as follows:

using System.Reflection;
using System.Web.Http;
using System.Web.Mvc;
using Autofac;
using Autofac.Integration.Mvc;
using Autofac.Integration.WebApi;
using Umbraco.Web;
using Data;
using Data.Interface;
using Service;
using Service.Interface;

namespace Website.App_Start
{
    public class DependencyInjectionConfig
    {
        public static void RegisterDependencies()
        {
            var builder = new ContainerBuilder();
            builder.RegisterControllers(Assembly.GetExecutingAssembly());
            builder.RegisterApiControllers(typeof(UmbracoApplication).Assembly);

            // Register Mapper Service, Geography Service, etc.

            builder.Register(c => new MapperService()).As<IMapperService>().SingleInstance();
            builder.RegisterType<CustomDbContext>().As<IUnitOfWork>().InstancePerRequest();
            builder.RegisterType<GeographyService>().As<IGeographyService>().InstancePerLifetimeScope();

            var container = builder.Build();
            var resolver = new AutofacWebApiDependencyResolver(container);
            GlobalConfiguration.Configuration.DependencyResolver = resolver;
            DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
        }
    }
}

I have added a new API Controller class called CountryApiController.cs to folder Controllers:

using System.Collections.Generic;
using System.Web.Mvc;
using Data.Interface;
using Domain.Model;
using Service.Interface;
using Umbraco.Web.Mvc;
using Umbraco.Web.WebApi;

namespace Website.Controllers
{
    // API Call: /umbraco/CountryList/CountryApi/GetCountries
    [PluginController("CountryList")]
    public class CountryApiController : UmbracoApiController
    {
        private IUnitOfWork DataContext { get; set; }
        private IGeographyService GeographyService { get; set; }
        private IMapperService MapperService { get; set; }

        public CountryApiController(IUnitOfWork dataContext, IGeographyService geographyService, IMapperService mapperService)
        {
            DataContext = dataContext;
            GeographyService = geographyService;
            MapperService = mapperService;
        }

        [HttpGet]
        public IEnumerable<Country> GetCountries()
        {
            return GeographyService.GetCountries();
        }
    }
}

When I Build and Run the solution and go to: http://localhost:59761/umbraco/CountryList/CountryApi/GetCountries

I get the following exception message:

An error occurred when trying to create a controller of type 'CountryApiController'. Make sure that the controller has a parameterless public constructor.

Type 'Website.Controllers.CountryApiController' does not have a default constructor.

Could someone please help me resolve this exception. Thanks.