using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Ch1{    public delegate void GreetingDelegate(string name);//委托    public class FirstDelegate    {        public static void GreetingChinese(string name)        {            Console.WriteLine("早上好：" + name);        }        public static void GreetingEnglish(string name)        {            Console.WriteLine("Good morning：" + name);        }    }    public class GreetingManager    {        public static GreetingDelegate MakeLanguageByDelegate;        public static void GreetingPeople(string name)        {            if (MakeLanguageByDelegate != null)            {                MakeLanguageByDelegate(name);            }        }        public static event GreetingDelegate MakeLanguageByEvent;//事件,不管是不是声明为public，它总是被声明为private        public static void GreetingPeopleEvent(string name)        {            if (MakeLanguageByEvent != null)            {                MakeLanguageByEvent(name);            }        }    }    public class FirstDelegate1    {        public void GreetingChinese(string name)        {            Console.WriteLine("早上好：" + name);        }        public void GreetingEnglish(string name)        {            Console.WriteLine("Good morning：" + name);        }    }    public class GreetingManager1    {        public GreetingDelegate MakeLanguageByDelegate;        public void GreetingPeople(string name)        {            if (MakeLanguageByDelegate != null)            {                MakeLanguageByDelegate(name);            }        }        public event GreetingDelegate MakeLanguageByEvent;        public void GreetingPeopleEvent(string name)        {            if (MakeLanguageByEvent != null)            {                MakeLanguageByEvent(name);            }        }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Ch1{    /**     * Observer模式定义对象间的一对多的依赖关系,当一个对象的状态发生改变时, 所有依赖于它的对象都得到通知并被自动更新。     * 水烧开的时候通知报警器和显示器     * */    public class WaterDelegate    {        private int temperature = 0;        public delegate void BoilHandler(int param);//声明委托        public event BoilHandler BoilEvent;//声明事件        public void BoilWater()        {            for (int i = 0; i <= 100; i++)            {                temperature = i;                if (temperature >= 95) //温度大于95警告并且显示温度                {                    if (BoilEvent != null) //如果有对象注册                    {                        BoilEvent(temperature); //调用所有注册方法                        Console.WriteLine("-----------------");                    }                }            }        }    }    //报警    public class Alarm    {        public void MakeAlert(int temperature)        {            Console.WriteLine("Alarm：嘀嘀嘀，水已经 {0} 度了：", temperature);        }        /**         * .Net Framework中的委托与事件         * 委托声明原型中的Object类型的参数代表了Object，也就是监视对象，在本例中是 Heater(热水器)。回调函数(比如Alarm的MakeAlert)可以通过它访问触发事件的对象(Heater)。         * EventArgs 对象包含了Observer所感兴趣的数据，在本例中是temperature。         * */        public void MakeAlert(Object sender, BoiledEventArgs e)        {            Heater heater = (Heater)sender;            Console.WriteLine("Alarm：{0} - {1}, 嘀嘀嘀，水已经 {2} 度了 ", heater.area, heater.type, e.temperature);        }    }    //显示    public class Display    {        public static void ShowMessage(int temperature)        {            Console.WriteLine("Display：水快烧开了，当前温度：{0}度。", temperature);        }        public static void ShowMessage(Object sender, BoiledEventArgs e)        {            Console.WriteLine("Display：水快烧开了，当前温度：{0}度。", e.temperature);            Console.WriteLine();        }    }    public class Heater    {        private int temperature;        public string area { get; set; }    //添加地区        public string type { get; set; }   //添加类型        public delegate void BoiledEventHandler(Object sender, BoiledEventArgs e);//委托        public event BoiledEventHandler Boiled;//事件        // 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 OnBoild(BoiledEventArgs e)        {            if (Boiled != null) //如果有对象注册            {                Boiled(this, e); //调用所有注册方法            }        }        public void BoilWater()        {            for (int i = 0; i <= 100; i++)            {                temperature = i;                if (temperature >= 95) //温度大于95警告并且显示温度                {                    BoiledEventArgs e = new BoiledEventArgs(temperature);                    OnBoild(e);                }            }        }    }    // 定义BoiledEventArgs类，传递给Observer所感兴趣的信息    public class BoiledEventArgs : EventArgs    {        public readonly int temperature;        public BoiledEventArgs(int temperature)        {            this.temperature = temperature;        }    }}

using System;using System.Collections;using System.Collections.Generic;using System.Linq;using System.Text;using System.Text.RegularExpressions;using System.Threading.Tasks;namespace Ch1{    class Program    {        static void Main(string[] args)        {            //------------------------静态处理方法------------------------            //GreetingManager.MakeLanguageByDelegate = FirstDelegate.GreetingEnglish;            //GreetingManager.GreetingPeople("jason hua");            //GreetingManager.MakeLanguageByDelegate = FirstDelegate.GreetingChinese;            //GreetingManager.GreetingPeople("杰");            //GreetingManager.MakeLanguageByEvent += FirstDelegate.GreetingEnglish;            //GreetingManager.GreetingPeopleEvent("Jason Hua");            //GreetingManager.MakeLanguageByEvent += FirstDelegate.GreetingChinese;            //GreetingManager.GreetingPeopleEvent("杰");            //-----------------------普通处理方法-------------------------------            //FirstDelegate1 fd = new FirstDelegate1();            //GreetingManager1 gm = new GreetingManager1();            //gm.MakeLanguageByDelegate = fd.GreetingEnglish;//注册对象            //gm.GreetingPeople("jason hua");            //gm.MakeLanguageByDelegate = fd.GreetingChinese;//注册对象            //gm.GreetingPeople("杰");            //Console.WriteLine();            //gm.MakeLanguageByEvent += fd.GreetingEnglish;//注册对象            //gm.GreetingPeopleEvent("jason hua");            //gm.MakeLanguageByEvent += fd.GreetingChinese;//注册对象            //gm.GreetingPeopleEvent("杰");            //普通的项目中的例子            //WaterDelegate wd = new WaterDelegate();            //Alarm alarm = new Alarm();            //wd.BoilEvent += alarm.MakeAlert;//注册对象            //wd.BoilEvent += Display.ShowMessage;//注册静态对象            //wd.BoilWater();            //仿微软的事件与委托，项目中的小例子            Heater heater = new Heater();            Alarm alarm = new Alarm();            heater.area = "河南";            heater.type = "九阳";            heater.Boiled += alarm.MakeAlert;            heater.Boiled += Display.ShowMessage;            heater.BoilWater();            Console.ReadLine();        }    }}