using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace ConsoleApplication1
{public delegate void DGEach(int index,object item);public delegate void DGTest();internal class Program{public static void Test1(DGTest dgTest){dgTest(); //编译后：dgTest.Invoke();Console.WriteLine("Test1");}public static void Test2(){Console.WriteLine("Test2");}public static void Test3(){Console.WriteLine("Test3");}/// <summary>/// 委托当返回值/// </summary>/// <param name="strType"></param>/// <returns></returns>public static DGTest InvokeTest(string strType){switch (strType){case "2":return Test2;case "3":return Test3;default:return Test3;}}/// <summary>/// 使用委托模仿jQuery each方法/// </summary>/// <param name="list"></param>/// <param name="func"></param>public static void Each(ArrayList list, DGEach func){for (int i = 0; i < list.Count; i++){func(i, list[i]);}}private static void Main(string[] args){#region 委托当参数//DGTest dgTest = new DGTest(Test2);//或者    DGTest dgTest  = Test2;//Test1(dgTest);#endregion#region  委托当返回值//DGTest dgTest = InvokeTest("2");//dgTest();#endregion#region 完成 Each方法//ArrayList list = new ArrayList();//list.Add("刘德华");//list.Add("张学友");//list.Add("郭富城");//list.Add("黎明");// Each(list, delegate(int index,object item)// {//     Console.WriteLine(index+"---------"+item.ToString());// });#endregion#region 事件练习,一个设计模式的题目，说有三个对象，猫，老鼠，人，猫看见了老鼠，老鼠吓跑了，在过程中把人吵醒， 在编程过程中注意新的对象的参与Cat c = new Cat();c.Name = "tom";c.DGRunEventHandler += c_DGRunEventHandler;c.SeeMouse(c.Name);#endregion}private static void c_DGRunEventHandler(object sender,EventArgs e){Mouse m = new Mouse();m.Name = "mouse1";m.DGRunEventHandler += m_DGRunEventHandler;m.MouseRun(m);}private static void m_DGRunEventHandler(object sender, EventArgs e){Person p = new Person();p.WakeUp(sender);}}public class Cat{public event EventHandler DGRunEventHandler;public void SeeMouse(string name){Console.WriteLine(name+"看见老鼠");if (DGRunEventHandler != null){DGRunEventHandler(this,new EventArgs());}}public  string Name { get; set; }}public class Person{public void WakeUp(object sender){Console.WriteLine((sender as Mouse).Name+"老鼠跑,人醒了");}public string Name { get; set; }}public class Mouse{public event EventHandler DGRunEventHandler;public void MouseRun(object sender){Console.WriteLine((sender as Mouse).Name+"老鼠跑");if (DGRunEventHandler != null){DGRunEventHandler(this, new EventArgs());}}public string Name { get; set; }}
}