System.Collections 命名空间包含接口和类,这些接口和类定义各种对象(如列表、队列、位数组、哈希表和字典)的集合。
System.Collections.Generic 命名空间包含定义泛型集合的接口和类,泛型集合允许用户创建强类型集合,它能提供比非泛型强类型集合更好的类型安全性和性能。
System.Collections.Specialized 命名空间包含专用的和强类型的集合,例如,链接的列表词典、位向量以及只包含字符串的集合。
ArrayList 类:使用大小可按需动态增加的数组。
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
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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
}
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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
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}
}
}
}
System.Collections.Generic 命名空间包含定义泛型集合的接口和类,泛型集合允许用户创建强类型集合,它能提供比非泛型强类型集合更好的类型安全性和性能。
System.Collections.Specialized 命名空间包含专用的和强类型的集合,例如,链接的列表词典、位向量以及只包含字符串的集合。
ArrayList 类:使用大小可按需动态增加的数组。
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