本文实例讲述了ASP.NET中Dictionary基本用法。分享给大家供大家参考,具体如下:

 
//Dictionary位于System.Collections.Generic命名空间之下
/*
 * 使用Dictionary之前必须引用System.Collections.Generic命名空间;
 * 使用Dictionary时必须声明其键和值的数据类型(可以为任意类型);
 */
//声明实例化Dictionary为dic
System.Collections.Generic.Dictionary<int, string> dic = new System.Collections.Generic.Dictionary<int, string>();
//为dic添加键和值
dic.Add(100, "quber100");
dic.Add(200, "quber200");
//检查是否存在300这个键
if (!dic.ContainsKey(300))
{
  //新增加300(键)和对应的quber300(值)
  dic.Add(300, "quber300");
}
//移除dic键为300的项
dic.Remove(300);
//获取dic键值对总数
int dicCount = dic.Count;
Response.Write("循环获取dic中的键和值:<br/>");
//循环获取dic中的键和值
foreach (KeyValuePair<int, string> keyDic in dic)
{
  Response.Write("key:" + keyDic.Key + ",value:" + keyDic.Value + "<br/>");
}
Response.Write("<hr/><br/>");
Response.Write("循环获取dic中的键:<br/>");
//循环获取dic中的键
Dictionary<int, string>.KeyCollection keyDics = dic.Keys;
foreach (int iKey in keyDics)
{
  Response.Write("key:" + iKey + "<br/>");
}
Response.Write("<hr/><br/>");
Response.Write("另一种方法循环获取dic中的键:<br/>");
//循环获取dic中的键
foreach (int iKey in dic.Keys)
{
  Response.Write("key:" + iKey + "<br/>");
}
Response.Write("<hr/><br/>");
Response.Write("循环获取dic中的值:<br/>");
//循环获取dic中的值
Dictionary<int, string>.ValueCollection valueDics = dic.Values;
foreach (string strValue in valueDics)
{
  Response.Write("value:" + strValue + "<br/>");
}
Response.Write("<hr/><br/>");
Response.Write("另一种方法循环获取dic中的值:<br/>");
//循环获取dic中的值
foreach (string strValue in dic.Values)
{
  Response.Write("value:" + strValue + "<br/>");
}
Response.Write("<hr/><br/>");
Response.Write("获取dic中单个键和值:<br/>");
Response.Write("key:100,value:" + dic[100] + "<br/>");
Response.Write("<hr/><br/>");
Response.Write("检查dic中是否存在键(100),并返回其值dicStr:<br/>");
//检查dic中是否存在键(100),并返回其值dicStr
string dicStr = string.Empty;
if (dic.TryGetValue(100, out dicStr))
{
  Response.Write("OK");
}
else
{
  Response.Write("NO");
}
Response.Write("<hr/><br/>");