C#委托、事件学习之（三）——热水器烧水案例

using System;

namespace DelegateExample
{
    public class Heater
    {
        private int temperature;
        public string type = "RealFire 001"; // 添加型号作为演示
        public string area = "China Xi'an"; // 添加产地作为演示
                                            //声明委托
        public delegate void BoiledEventHandler(Object sender, BoiledEventArgs e);
        public event BoiledEventHandler Boiled; //声明事件
                                                // 定义BoiledEventArgs类，传递给Observer所感兴趣的信息
                                                //继承EventArgs
        public class BoiledEventArgs : EventArgs
        {
            public readonly int temperature;//
            public BoiledEventArgs(int temperature)
            {
                this.temperature = temperature;
            }
        }
        // 可以供继承自 Heater 的类重写，以便继承类拒绝其他对象对它的监视
        protected virtual void OnBoiled(Boil