委托和事件的区别

最新推荐文章于 2025-01-22 16:12:18 发布

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最新推荐文章于 2025-01-22 16:12:18 发布

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原文链接：http://www.cnblogs.com/gnaguix/archive/2012/04/20/2459024.html

委托和事件的区别

我想我知道委托和时间的区别了

委托可以被外部调用

namespace GrammerTest

{
     public delegate void FuncDelegate();
     public class DelegateTest
    {
         public FuncDelegate FuncDelegateObject;
         public  DelegateTest()
        {
            FuncDelegateObject = Func1;
            FuncDelegateObject += Func2;
        }



         public void Func1()
        {
            Console.WriteLine( " Func 1 ");
        }

         public void Func2()
        {
            Console.WriteLine( " Func 2 ");
        }
    }
}

private static void Main()

        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault( false);

             // new ForeachNullList().Run();

             new DelegateTest().FuncDelegateObject();

            Console.Read();
             // Application.Run(new Form1());
        }

事件不可以从类的外部发动

using System;

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

namespace GrammerTest
{
     public delegate void ADelegate();
     public class EventPublisher
    {
         public event ADelegate AEvent;
         public void Fire()
        {
             if (AEvent != null)
                AEvent();
        }

    }

     internal class EventClient
    {

         public void Func1()
        {
            Console.WriteLine( " Func 1 ");
        }
    }

     internal class EventClient2
    {
         public void Func2()
        {
            Console.WriteLine( " Func 2 ");
        }
    }

     class EventTest
    {
         public void Run()
        {
            EventPublisher ep = new EventPublisher();
            EventClient ec1 = new EventClient();
            EventClient2 ec2 = new EventClient2();
            ep.AEvent += ec1.Func1;
            ep.AEvent += ec2.Func2;

             // ep.AEvent(); doesn't work
             // only
            ep.Fire();
        }
    }

}