logging-events-example.cs

    class Foo
    {
        private readonly IEvents _events;

        public Foo(IEvents events)
        {
            _events = events;
        }

        public interface IEvents
        {
            void ThatHappened(int i);
        }

        void That(int i)
        {
            _events.ThatHappened(i);
        }
    }

    class FooEventsLogger : Foo.IEvents
    {
        public void ThatHappened(int i)
        {
            Log("That happened w/ {0}", i);
        }
    }