拾遗补缺之hashtable

其实hastable就像是一个特殊的数组,它有一个类似主键的唯一编号(类似数组[]中的数字,这个键值是你随便写的),和这个唯一编号又对应一个值value(值的数据类型是不受限制的)
下面是一个适用hashtable类的例子:
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace 练习
{
    public class name
    {

        Hashtable hs = new Hashtable();
        public void hashtable()
        {
            hs.Add("001","周杰伦87992352");
            hs.Add("002","张娜拉87993952");
            hs.Add("003","刘德华87993723");
            foreach (DictionaryEntry dr in hs)//通过DictionaryEntry遍历hashtable
            {
                string key = (string)dr.Key;
                string value = (string)dr.Value;
                Console.WriteLine("编号为"+key+" 的号码为：");
            }
           hs.Remove("003");//移除键值为003的记录
            if (!hs.Contains("003"))
            { Console.WriteLine("电话簿中不存在编号为003的记录"); }
            else
            { Console.WriteLine((string)hs["003"]); }
            if (!hs.ContainsValue("刘德华87993723"))
            { hs.Add("003", "刘德华87993723"); }
            else
            { Console.WriteLine("记录已经存在"); }
            foreach (string skey in hs.Keys)    //通过键集合来遍历hashtable
            { Console.WriteLine((string)hs[skey]); }
         

        }
       public static void Main(String[] args)
        {
            name n = new name();
            n.hashtable();
        }

    }
}