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

You might be missing calling configuration from WebApiConfig.cs file:

IocConfigurator.ConfigureDependencyInjection(config);

ConfigureDependencyInjection can be like this:

public static void ConfigureDependencyInjection(HttpConfiguration config)
        {

            var builder = new ContainerBuilder();

            // Register your Web API controllers.
            builder.RegisterApiControllers(Assembly.GetExecutingAssembly());

            // OPTIONAL: Register the Autofac filter provider.
            builder.RegisterWebApiFilterProvider(config);

            // OPTIONAL: Register the Autofac model binder provider.
            builder.RegisterWebApiModelBinderProvider();

            // Set the dependency resolver to be Autofac.
            var container = builder.Build();
            config.DependencyResolver = new AutofacWebApiDependencyResolver(container);

        }