可以帮助学习基础的C#知识 认识和进一步了解委托和事件。本实例利用委托和事件来实现一个简单的烧水器，报警器，控制器功能-Can help learn the basics of C# knowledge and understanding more about delegates and events. The examples of the use of delegates and events to implement a simple kettle, alarm, controller f