In my asp.net mvc3 application, I will need access to my service layer
(nhibernate service classes that wrap my repositories).

And also, from within my nhibernate service layer, I will need access
to other services from within a given service, but for some reason
most examples seem to show that the UserService only needs
UserRepository.

e.g.

UserService will need access to the UserRepository, but also a
particular method might need access to another service, how should I
wire this up?  Should I inject all services or just the ones I need?

public class UserService : IUserService
{
   private IUserRepository _userRepositry;

   public UserService(IUserRepository userRepository)
   {
        this._userRepository = userRepository;
   }


   public void SomeMethod()
   {

       // need access to IContentRepository

   }
}

I guess the obvious thing is to add IContentRepository to my
constructor, and just continue with this kind of pattern i.e. add
whatever repository I need in the constructor on a need basis right?

BTW, will I have to register each dependancy individually or do I just
do it once and the container will figure it out?

This same issue arises in my MVC Controllers i.e. some controllers
might only need access to a single service like IUserService, while
others will need access to multiple services.

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