委托的了解

题目：显示 早上好，中午好，晚上好的 +名称

我们将早上好，中午好，晚上好封装成一个类，利用委托调用对应的方法。

class1.cs

 

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

namespace WindowsApplication1
{
   public class Class1
    {
       internal delegate void getd(string name);
       internal event getd dd;
       public void zw(string name)
       {
           System.Windows.Forms.MessageBox.Show("中午好" + name);
       }
       public void zs(string name)
       {
           System.Windows.Forms.MessageBox.Show("早上好" + name);
       }
       public void ws(string name)
       {
           System.Windows.Forms.MessageBox.Show("晚上好" + name);
       }

       public void gettype(string name)
       {
           if(dd!=null)
           dd(name);
       }
    }
}

 

 

Form1.cs

 

 

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

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            DateTime nn = DateTime.Now;
            DateTime d1=Convert.ToDateTime("12:00:00");
            
            Class1 c = new Class1();
            DateTime d2 = Convert.ToDateTime("18:00:00");
            if (nn < d1)
            {
                c.dd+=new Class1.getd(c.zs);
                
                c.gettype("***");
            }
            else if (nn < d2)
            {
                c.dd += new Class1.getd(c.zw);

                c.gettype("***");
            }
            else if (nn > d2)
            {
                c.dd+=new Class1.getd(c.ws);
                c.gettype("***");
            }

            
           
          
        }

      

    }
}

 

 

 早上好，***

中午好，***

晚上好，***