Factory method with DI and IoC

Question

I am familiar with these patterns but still don\'t know how to handle following situation:

public class CarFactory
{
     public CarFactory(Dep1,Dep2,Dep3,De         


        

Answer 1

Many DI containers support the notion of named dependencies.

E.g. (Structuremap syntax)

For().Use().Named("aCar");
Container.GetNamedInstance("aCar") // gives you a CarA instance

If you use something like a convention, a rule how the name is derived from the concrete car type itself, you have a situation where you don't need to touch the factory anymore when you extend the system.

Using this in a factory is straightforward.

class Factory(IContainer c) {
  public ICar GetCar(string name) {
    Return c.GetNamedInstance(name);
  }
}