Generic Service Locator

gistfile1.cs

public class ServiceLocator
{
  //Some kind of singleton is here...

  // only the stuff that matters
  public static void For<T>(params Func<T>[] regs)
  {
     // ...
  }
  public static T Use<T>()
  {
    // ..
  }
  
}
// usage
ServiceLocator.Instance.For<IFoo>(ServiceLocator.Use<Foo>(),ServiceLocator.Use<Bar>());

// nice but something like
ServiceLocator.Instance.For<IFoo>(Use<Foo>(),Use<Bar>());
// seems to be more elegant...
// Use<T> is a extension method on object, so its a global method...

// working approach is 
SerivceLocator.Instance.For<IFoo>().Use<Foo>().Use<FooBar>().Use<Bar>();