How to register a Controller into ASP.NET MVC when the controller class is in a different assembly?

Question

My goal is to modify asp.net mvc's controller registery so that I can create controllers and views in a separate (child) assembly, and just copy the View files and the DLLs to the host MVC application and the new controllers are effectively "Plugged In" to the host app.

Obviously, I will need some sort of IoC pattern, but I'm at a loss.

My thought was to have a child assembly with system.web.mvc referenced and then to just start building controller classes that inherited from Controller:

Separate Assembly:

using System.Web; using System.Web.Mvc;  namespace ChildApp {     public class ChildController : Controller     {         ActionResult Index()         {             return View();         }     } } 

Yay all fine and dandy. But then I looked into modifying the host application's Controller registry to load my new child controller at runtime, and I got confused. Perhaps because I need a deeper understanding of C#.

Anyway, I thought I needed to create a CustomControllerFactory class. So I started writing a class that would override the GetControllerInstance() method. As I was typing, intellisence popped this up:

Host MVC Application:

public class CustomControllerFactory : DefaultControllerFactory  {     protected override IController GetControllerInstance(System.Web.Routing.RequestContext requestContext, Type controllerType)     {         return base.GetControllerInstance(requestContext, controllerType);     } } 

Now, at this point I'm at a loss. I don't know what that does. Originally, I was going to write a "Controller Loader" class like a Service Locator like this:

Host MVC Application:

public class ControllerLoader {     public static IList<IController> Load(string folder)     {         IList<IController> controllers = new List<IController>();          // Get files in folder         string[] files = Directory.GetFiles(folder, "*.plug.dll");         foreach(string file in files)         {             Assembly assembly = Assembly.LoadFile(file);             var types = assembly.GetExportedTypes();             foreach (Type type in types)             {                 if (type.GetInterfaces().Contains(typeof(IController)))                 {                     object instance = Activator.CreateInstance(type);                     controllers.Add(instance as IController);                 }             }         }         return controllers;     } } 

And then I was planning on using my list of controllers to register them in the controller factory. But ... how? I feel like I'm on the edge of figuring it out. I guess it all bois down to this question: How do I hook into return base.GetControllerInstance(requestContext, controllerType);? Or, should I use a different approach altogether?

Answer 1

Reference the other assembly from the 'root' ASP.NET MVC project. If the controllers are in another namespace, you'll need to modify the routes in global.asax, like this:

public static void RegisterRoutes(RouteCollection routes) {     routes.IgnoreRoute("{resource}.axd/{*pathInfo}");      routes.MapRoute(         name: "Default",         url: "{controller}/{action}/{id}",         defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },         namespaces: new[] { typeof(HomeController).Namespace }     );  } 

Notice the additional namespaces argument to the MapRoute method.