using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            ArrayList al = new ArrayList();
            al.Add(100);//单个添加
            foreach (int number in new int[6] { 9, 3, 7, 2, 4, 8 })
            {
                al.Add(number);//集体添加方法一
            }
            int[] number2 = new int[2] { 11, 12 };
            al.AddRange(number2);//集体添加方法二
            al.Remove(3);//移除值为3的
            al.RemoveAt(3);//移除第3个
            ArrayList al2 = new ArrayList(al.GetRange(1, 3));//新ArrayList只取旧ArrayList一部份


            Console.WriteLine("遍历方法一:");
            foreach (int i in al)//不要强制转换
            {
                Console.WriteLine(i);//遍历方法一
            }

            Console.WriteLine("遍历方法二:");
            for (int i = 0; i < al2.Count; i++)//数组是length
            {
                int number = (int)al2[i];//一定要强制转换
                Console.WriteLine(number);//遍历方法二

            }
        }
    }
}

 

 

 

 

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
  <