using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 namespace DelegateTest

 {

     class Program

     {

         //申明一个委托类型，它的实例引用一个方法

         //该方法传递0参数，返回void类型

         public delegate string DelegateTestOne();

         static void Main(string[] args)

         {

             //用静态方法来实例化委托

             DelegateTestOne teststatic = new DelegateTestOne(Program.method1);

             //用实例方法来实例化委托

             DelegateTestOne test2 = new DelegateTestOne(new Program().method2);

             //用实例方法来实例化委托

             DelegateTestOne test3 = new DelegateTestOne(new Program().method3);

             //定义空一个委托对象

             DelegateTestOne deleteAll = null;

             deleteAll += teststatic;

             deleteAll += test2;

             deleteAll += test3;

             Console.WriteLine(Test(deleteAll));

             Console.ReadLine();

         }

         public static string method1()

         {

             //Console.WriteLine("这是一个静态方法");

             return "这是一个静态方法";

         }

         public string method2()

         {

             //Console.WriteLine("这是实例方法2");

             return "这是实例方法2";

         }

         public string method3()

         {

            // Console.WriteLine("这是实例方法3");

             return "这是实例方法3";

         }

         //测试多播委托

         public static string Test(DelegateTestOne testone)

         {

             if (testone == null)

             {

                 return null;

             }

             StringBuilder returnstring = new StringBuilder();

             Delegate[] delegatearray = testone.GetInvocationList();

             foreach (DelegateTestOne t in delegatearray)

             {

                 try

                 {

                     returnstring.Append(t() + Environment.NewLine);

                 }

                 catch (Exception e)

                 {

                 }

             }

             //把结果返回给调用者

             return returnstring.ToString();

         }

     }

 }