An error occurred when trying to create a controller of type 'TypeNewsController'

Question

I have searched long and hard but found nothing that helped yet. Where am I going wrong? I really do not know what to do. I wrote all the details below. I've tried and did not succeed.

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

 public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            WebApiConfig.Register(GlobalConfiguration.Configuration);
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
            Bootstrapper.Run();
        }
    }

my apicontroller :

public class TypeNewsController : ApiController
    {
        private readonly ITypeNewsService _typeNewsService;

        public TypeNewsController(ITypeNewsService typeNewsService)
        {
            _typeNewsService = typeNewsService;
        }
        [HttpGet]
        public TypeNewsResponse Get([ModelBinder] PageRequest model)
        {
            model = model ?? new PageRequest();
            var output = _typeNewsService.GetTypeNewss().ToList();
            return new TypeNewsResponse
            {
                Page = model.PageIndex,
                Records = model.PageSize,
                Rows = output.ToList(),
                Total = output.Count() / model.PageSize,
            };
        }
    }

error :

<Error>
<Message>An error has occurred.</Message>
<ExceptionMessage>
An error occurred when trying to create a controller of type 'TypeNewsController'. Make sure that the controller has a parameterless public constructor.
</ExceptionMessage>
<ExceptionType>System.InvalidOperationException</ExceptionType>
<StackTrace>
at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType) at System.Web.Http.Controllers.HttpControllerDescriptor.CreateController(HttpRequestMessage request) at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken) at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__0.MoveNext()
</StackTrace>
<InnerException>
<Message>An error has occurred.</Message>
<ExceptionMessage>
Type 'JuventusNewsSiteApk.Controllers.TypeNewsController' does not have a default constructor
</ExceptionMessage>
<ExceptionType>System.ArgumentException</ExceptionType>
<StackTrace>
at System.Linq.Expressions.Expression.New(Type type) at System.Web.Http.Internal.TypeActivator.Create[TBase](Type instanceType) at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator(HttpRequestMessage request, Type controllerType, Func`1& activator) at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)
</StackTrace>
</InnerException>
</Error>

Bootstrapper class :

public static class Bootstrapper
    {
        public static void Run()
        {
            SetAutofacContainer();
            //Configure AutoMapper
            AutoMapperConfiguration.Configure();
        }

        private static void SetAutofacContainer()
        {
            var builder = new ContainerBuilder();
            builder.RegisterControllers(Assembly.GetExecutingAssembly());
            builder.RegisterApiControllers(Assembly.GetExecutingAssembly());
            builder.RegisterType<UnitOfWork>().As<IUnitOfWork>().InstancePerRequest();
            builder.RegisterType<DatabaseFactory>().As<IDatabaseFactory>().InstancePerRequest();
            builder.RegisterAssemblyTypes(typeof(NewsRepository).Assembly)
                .Where(t => t.Name.EndsWith("Repository"))
                .AsImplementedInterfaces().InstancePerRequest();
            builder.RegisterAssemblyTypes(typeof(NewsService).Assembly)
                .Where(t => t.Name.EndsWith("Service"))
                .AsImplementedInterfaces().InstancePerRequest();

            builder.RegisterAssemblyTypes(typeof(DefaultFormsAuthentication).Assembly)
                .Where(t => t.Name.EndsWith("Authentication"))
                .AsImplementedInterfaces().InstancePerRequest();

            builder.Register(
                c => new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new JuventusNewsApkEntities())))
                .As<UserManager<ApplicationUser>>().InstancePerRequest();

            builder.RegisterFilterProvider();
            IContainer container = builder.Build();
            DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
        }
    }

update :

 public class TypeNewsService : ITypeNewsService
    {
        private readonly ITypeNewsRepository _typeNewsRepository;
        private readonly IUnitOfWork _unitOfWork;
        public TypeNewsService(ITypeNewsRepository typeNewsRepository,
            IUnitOfWork unitOfWork)
        {
            _typeNewsRepository = typeNewsRepository;
            _unitOfWork = unitOfWork;
        }

        #region ITypeNewsService Member

        public void AddTypeNews(TypeNews typeNews)
        {
            _typeNewsRepository.Add(typeNews);
            SaveTypeNews();
        }

        public void DeleteTypeNews(int id)
        {
            _typeNewsRepository.DeleteById(id);
            SaveTypeNews();
        }

        public IEnumerable<TypeNews> GetTypeNewss()
        {
            var output = _typeNewsRepository.GetAll();
            return output;
        }

        public void SaveTypeNews()
        {
            _unitOfWork.Commit();
        }

        #endregion

    }

    public interface ITypeNewsService
    {
        void AddTypeNews(TypeNews typeNews);
        void DeleteTypeNews(int id);
        IEnumerable<TypeNews> GetTypeNewss();
        void SaveTypeNews();
    }

Answer 1

Your controller is WebApi controller and registration for Autofac differs from MVC registration. WebApi does not use DependencyResolver, so you'll need to tell WebApi to use Autofac resolver specifically.

You'll need to add this to your SetAutofacContainer code:

// Create the depenedency resolver.
var resolver = new AutofacWebApiDependencyResolver(container);

// Configure Web API with the dependency resolver.
GlobalConfiguration.Configuration.DependencyResolver = resolver;

See https://code.google.com/p/autofac/wiki/WebApiIntegration for more info.

Answer 2

In my case, the reason was that the resolver could not find a mapping. That is, suppose say HomeController has a dependency on IDumb, the resolver could not find a concrete implementation of Dumb which implements IDumb.

In other words the error message

**No parameterless constructor defined for this object
An error occurred when trying to create a controller of type 'ToDoListT1.WebApp.Controllers.HomeController'. Make sure that the controller has a parameterless public constructor**

is completely misleading.

In my case I just resolved by adding a reference to the project of the class Dumb. It should have been something like "No mapping for IDumb could be found.". I am not sure whether the problem is with NInject or MS. Whatever, it took me hours to find this out.