Injecting dependencies into custom Web API action filter attribute with Autofac

Question

I\'m trying to resolve the dependencies of my custom AuthorizeAttribute which I use to decorate my API controllers in an MVC4 app. Problem is that I keep getting a

Answer 1

I think Autofac's documentation offers much simpler solution for WebApi action filters.

public interface ServiceCallActionFilterAttribute : ActionFilterAttribute
{
  public override void OnActionExecuting(HttpActionContext actionContext)
  {
    // Get the request lifetime scope so you can resolve services.
    var requestScope = actionContext.Request.GetDependencyScope();

    // Resolve the service you want to use.
    var service = requestScope.GetService(typeof(IMyService)) as IMyService;

    // Do the rest of the work in the filter.
    service.DoWork();
  }
}

It is not "pure DI" as it is using service locator, but it is simple and works with the request scope. You don't need to worry about registering specific action filter for each WebApi controller.

Source: http://autofac.readthedocs.io/en/latest/integration/webapi.html#provide-filters-via-dependency-injection