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,***