Autofac manual dependency resolver

Autofac Dependency Resolver

/* 
  Inject the IComponentContext in the property of every BaseController
  In BaseController I'll use IComponentContext to resolve services that are non singleton(i.e. datacontext dependency that
  use per request lifetime scope)
*/
static void SetDependencyResolverAndConfig(Action<ContainerBuilder> config)
{
    var builder = new ContainerBuilder();
    builder.RegisterApiControllers(Assembly.GetExecutingAssembly())
        .OnActivated((e) => 
        { 
            if (e.Instance is BaseController)
            {
                (e.Instance as BaseController).IocContext = e.Context.Resolve<IComponentContext>();
            }
        });

    config(builder);

    var container = builder.Build();
    
    var resolver = new AutofacWebApiDependencyResolver(container);

    GlobalConfiguration.Configuration.DependencyResolver = resolver;
}


/*
  In the BaseController I'll use IocContext to resolve any dependency registered with the Autofac container,
  even the per-request dependencies.
*/
public class BaseController : ApiController
{
    public Autofac.IComponentContext IocContext { get; set; }

    protected Data.User CurrentUser
    {
        get
        {
            if (_currentUser == null)
            {
                var service = this.IocContext.Resolve<UserService>();
                _currentUser = service.GetUserByGuid(this.CurrentIdentity.Guid);    
            }
    
            return _currentUser;
        }
    }
}