form1.cs

Visual C#2005程序设计教程

using System;
using System.Collections.Generic;
using System.Collections;   // 添加集合命名空间的引用
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WinAppTest08
{
    public partial class Form1 : Form
    {
        private ArrayList aList = new ArrayList();   // 创建数组列表
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "") return;
            button2.Enabled = button3.Enabled = button4.Enabled = true;
            button1.Enabled = false;
            int num = int.Parse(textBox1.Text);
            for(int i=1;i<=num;i++)
                if (num % i == 0)
                {
                    aList.Add(i);
                }
            MessageBox.Show(num+"的所有约数求取完毕！", "消息");

        }

        private void button2_Click(object sender, EventArgs e)
        {
            aList.Clear();
            listBox1.Items.Clear();
            button2.Enabled = button3.Enabled = button4.Enabled = false;
            button1.Enabled = true;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            listBox1.Items.Clear();
            if (aList.Count < 5)
            {
                for (int i = 0; i < aList.Count; i++)
                    listBox1.Items.Add(aList[i]);
            }
            else
            {
                for(int i=0;i<5;i++)
                    listBox1.Items.Add(aList[i]);
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            listBox1.Items.Clear();
            if (aList.Count < 5)
            {
                for (int i = 0; i < aList.Count; i++)
                    listBox1.Items.Add(aList[i]);
            }
            else
            {
                for (int i = aList.Count - 5; i < aList.Count; i++)
                    listBox1.Items.Add(aList[i]);
            }
        }
    }
}