C#委托机制的演示代码

图1 带EventArgs的委托演示

图2 不带EventArgs的委托演示

带EventArgs的委托演示例程源代码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using System.Diagnostics;

namespace WindowsFormsApplication8
{
    public partial class Form1 : Form
    {
        public static TextBox ttt = null;
        public Form1()
        {
            InitializeComponent();
            ttt = this.textBox1;

        }

        p rivate void button1_Click(object sender, EventArgs e)
        {
            employee employee1 = new employee();
            employee1.Age = 33;
            employee1.Name = "猪悟能";
            admin admin1 = new admin();
            employee1.playgame +=new delegate1(admin1.notify);
            employee1.games();

        }

        p rivate class employee
        {
            String name = "";
            int age = 0;
            public event delegate1 playgame;

            public String Name
            {
                get { return this.name; }
                set { this.name = value; }
            }

            public int Age
            {
                get { return this.age; }
                set { this.age = value; }
            }

            public void games()
            {
                if (playgame != null)
                {
                    custom e = new custom();
                    e.Age = this.age;
                    e.Name = this.name;
                    playgame(this,e);
                }
            }
        }

        p rivate class admin
        {

            public void notify(object sender,custom e)
            {
                Form1.ttt.Text =e.Name+ 在玩游戏！年龄："+e.Age.ToString()+"宀?;
            }
        }

public delegate void delegate1(object sender,custom e);

        public class custom : EventArgs
        {
            String name = "";
            int age = 0;

            public String Name
            {
                set{this.name = value;}
                get { return this.name; }
            }

            public int Age
            {
                set { this.age = value; }
                get { return this.age; }
            }
        }

}
}