asp.net mvc 2 custom controller factory -

i'm learning mvc in asp.net space. if want pass controller ctor parameter seems can create controller factory register mvc framework. see examples below , have wonder how mvc framework knows use factory when controller created?

public class customcontrollerfactory : icontrollerfactory {     public icontroller createcontroller(system.web.routing.requestcontext requestcontext, string controllername)        {         ilogger logger = new defaultlogger();         var controller = new homecontroller(logger);         return controller;     }     public system.web.sessionstate.sessionstatebehavior getcontrollersessionbehavior(    system.web.routing.requestcontext requestcontext, string controllername)     {         return sessionstatebehavior.default;     }     public void releasecontroller(icontroller controller)     {         idisposable disposable = controller idisposable;         if (disposable != null)             disposable.dispose();     } }   public class mvcapplication : system.web.httpapplication {     protected void application_start()     {     registercustomcontrollerfactory ();     } } private void registercustomcontrollerfactory () {     icontrollerfactory factory = new customcontrollerfactory();     controllerbuilder.current.setcontrollerfactory(factory); } 

so controller factory creates instance of homecontroller , passes specific logger object. default controller factory never used in application because of registering custom controller factory? have 2 factories now? default other controllers , specific 1 homecontroller? if how mvc know controller factory use? in application want many controllers taking different parameter types, how work?

i tried googling specific question couldn't find around it. found bunch of frameworks people use, want understand specific part of it. thanks!

you not need controller factory that. take @ asp.net mvc dependency injection. should basic overview, , find dependency injector able work asp.net mvc 2