Autofac - Make sure that the controller has a parameterless public constructor

Question

I know it\'s been asked and answered before - the reason I\'m asking is because (I think) I tried all suggested solutions to this problem but still can\'t resolve it.

I

Answer 1

Check this answer.
It helps me configure correct ContainerBuilder() for WebApi controllers.

If you are looking here a solution for such error you should check your DependencyResolver Configuration first.

I faced the same issue and the problem was that I was using Autofac code samples for ContainerBuilder() object for MVC controllers and not API.

My code for register both type of controllers (MVC and Api):

var builder = new ContainerBuilder();
builder.RegisterControllers(Assembly.GetExecutingAssembly()); //Register MVC Controllers
builder.RegisterApiControllers(Assembly.GetExecutingAssembly()); //Register WebApi Controllers
builder.RegisterType().As();

var container = builder.Build();

DependencyResolver.SetResolver(new AutofacDependencyResolver(container)); //Set the MVC DependencyResolver
GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependencyResolver((IContainer)container); //Set the WebApi DependencyResolver