The inversion of control (IoC) pattern is abstract; it says that one should move dependency creation
out of the consumer class, but it doesn’t talk about exactly how to achieve that.
public class EmailService { public void SendMessage() { ... } }
public interface IMessagingService { void SendMessage(); } public class EmailService : IMessagingService { public void SendMessage() { ... } } public class NotificationSystem { private IMessagingService svc; public NotificationSystem() { svc = new EmailService(); } public void InterestingEventHappened() { svc.SendMessage(); } }
原文：http://www.cnblogs.com/yangyangss/p/4788466.html