委托和事件匿名委托

 public delegate void maojiaodelegate (object Sender, EventArgs e);
    /// <summary>
    /// 触发对象 观察者 人醒来
    /// </summary>
    public class BigMaster 
    {
         private Mao _cat;
         public BigMaster(Mao cat)
        {
            _cat = cat;
            _cat.onjiao += new maojiaodelegate(onxinglaile);
        }
         public void onxinglaile(object Sender, EventArgs e)
        {
            xinglaile();
        }
        public void xinglaile()
        {
            Console.WriteLine("xinglai");
        }
    }
    /// <summary>
    /// 事件引发者 被观察者 猫叫
    /// </summary>
    public class Mao
    {
        public event maojiaodelegate onjiao;
        public void catjiao( EventArgs e)
        {
            if (onjiao != null)
            {
                onjiao(this, e);
            }
        }

        public void catjiao()
        {
           //
            Console.WriteLine("jiao");
           EventArgs e=new EventArgs();
           catjiao(e);
         
        }

    }
    /// <summary>
    /// 触发对象 观察者 老鼠跑了
    /// </summary>
    public class Lashu 
    {

        private Mao _cat;
        public Lashu(Mao cat)
        {
            _cat = cat;
            _cat.onjiao += new maojiaodelegate(onrunningla);
        }
        public void onrunningla(object Sender,EventArgs e)
        {
            runningla();
        }
        public void runningla()
        {
            Console.WriteLine("pao");
        }
    }

            Mao mao = new Mao();
            mao.catjiao();
            BigMaster p = new BigMaster(mao);
            Lashu lao = new Lashu(mao);

Demo 委托

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 using System;
using System.Collections.Generic;
using System.Text;

namespace DelegateDemo
{
    class Class1
    {
        delegate double processDelegate(double db1, double db2);
        static double Multiply(double db1, double db2)
        {
            return db1 * db2;
        }
        static double Divide(double db1, double db2)
        {
            return db1 / db2;
        }
        static void NamedMethod(string strInput,double dbNum1,double dbNum2)
        {
            processDelegate process;           
            if (strInput == "M")
                process = new processDelegate(Multiply);
            else
                process = new processDelegate(Divide);
            Console.WriteLine("结果为：{0}", process(dbNum1, dbNum2));

        }
       //匿名的方法
        static void AnonymousMethod(string strInput, double dbNum1, double dbNum2)
        {
            processDelegate process;
            if (strInput == "M")
                process = delegate(double db1, double db2){return db1 * db2;};
            else
                process = delegate(double db1, double db2) { return db1 / db2; };
            Console.WriteLine("结果为：{0}", process(dbNum1, dbNum2));

        }
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            //
            // TODO: 在此处添加代码以启动应用程序
            Console.WriteLine("请输入两个小数，用逗号分割");
            string strInput = Console.ReadLine();
            int commmaPos = strInput.IndexOf(‘,‘);
            double dbNum1 = Convert.ToDouble(strInput.Substring(0, commmaPos));
            double dbNum2 = Convert.ToDouble(strInput.Substring(commmaPos + 1));
            Console.WriteLine("输入M表示乘法，或者D表示除法");
            strInput = (Console.ReadLine()).ToUpper();
            //使用命名方法
            Console.WriteLine("使用命名方法委托");
            NamedMethod(strInput,dbNum1,dbNum2);  
            //使用匿名方法
            Console.WriteLine("使用匿名方法委托");
            AnonymousMethod(strInput, dbNum1, dbNum2);  

        }
    }

}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace xiancheng
{
    class Program
    {
        delegate void mytest(int a,int b);
        static void Main(string[] args)
        {

            mytest tee = delegate(int x,int y) {
                int result = x + y;
                Console.WriteLine("这是匿名委托用法结果是：  "+result);
            };
            tee(2, 8);
            mytest tee2 = new mytest(getresult);
            tee2(9,8);

            //拉姆达
            mytest tee3 = (x,y)=>
            {
                int result = x + y;
                Console.WriteLine("这是拉姆达匿名委托用法结果是：  " + result);
            };
            tee3(88, 12);
            Console.ReadKey();
        }
        public static void getresult(int x, int y)
        {
            int result = x + y;
            Console.WriteLine("这不是匿名委托方法使用结果是：  "+result) ;
        }

    }
}

            List<int> arr = new List<int>() { 1, 2, 3, 4, 5, 6, 7 };
            arr.ForEach(new Action<int>(delegate(int a) { Console.WriteLine(a); }));
            arr.ForEach(new Action<int>(a => Console.WriteLine(a)));