StructureMap controller factory and null controller instance in MVC

Question

I\'m still trying to figure things out with StructureMap and one of the issues i\'m running into is my Controller Factory class blowing up when a null controller type is passed

Answer 1

What I think you need to do is exactly the same thing that the default MVC controller factory does on the GetControllerInstance method. If you look at the Microsoft source code for DefaultControllerFactory at http://aspnetwebstack.codeplex.com/ you will see that the DefaultControllerFactory throws a 404 Exception when controllerType is null. Here is how we do it based on this information:

 public class StructureMapControllerFactory : DefaultControllerFactory
 {
      protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
      {
           if (controllerType == null)
                return base.GetControllerInstance(requestContext, controllerType);
           var controller = ObjectFactory.GetInstance(controllerType);
           return (IController)controller;
      }
 }

Basically this will ensure that, when user enters an invalid route the application handles it as a 404 error.