ASP.NET中Dictionary基本用法實(shí)例分析

//Dictionary位于System.Collections.Generic命名空間之下
/*
 * 使用Dictionary之前必須引用System.Collections.Generic命名空間；
 * 使用Dictionary時(shí)必須聲明其鍵和值的數(shù)據(jù)類型（可以為任意類型）；
 */
//聲明實(shí)例化Dictionary為dic
System.Collections.Generic.Dictionaryint, string> dic = new System.Collections.Generic.Dictionaryint, string>();
//為dic添加鍵和值
dic.Add(100, "quber100");
dic.Add(200, "quber200");
//檢查是否存在300這個(gè)鍵
if (!dic.ContainsKey(300))
{
  //新增加300（鍵）和對(duì)應(yīng)的quber300（值）
  dic.Add(300, "quber300");
}
//移除dic鍵為300的項(xiàng)
dic.Remove(300);
//獲取dic鍵值對(duì)總數(shù)
int dicCount = dic.Count;
Response.Write("循環(huán)獲取dic中的鍵和值：br/>");
//循環(huán)獲取dic中的鍵和值
foreach (KeyValuePairint, string> keyDic in dic)
{
  Response.Write("key:" + keyDic.Key + ",value:" + keyDic.Value + "br/>");
}
Response.Write("hr/>br/>");
Response.Write("循環(huán)獲取dic中的鍵：br/>");
//循環(huán)獲取dic中的鍵
Dictionaryint, string>.KeyCollection keyDics = dic.Keys;
foreach (int iKey in keyDics)
{
  Response.Write("key:" + iKey + "br/>");
}
Response.Write("hr/>br/>");
Response.Write("另一種方法循環(huán)獲取dic中的鍵：br/>");
//循環(huán)獲取dic中的鍵
foreach (int iKey in dic.Keys)
{
  Response.Write("key:" + iKey + "br/>");
}
Response.Write("hr/>br/>");
Response.Write("循環(huán)獲取dic中的值：br/>");
//循環(huán)獲取dic中的值
Dictionaryint, string>.ValueCollection valueDics = dic.Values;
foreach (string strValue in valueDics)
{
  Response.Write("value:" + strValue + "br/>");
}
Response.Write("hr/>br/>");
Response.Write("另一種方法循環(huán)獲取dic中的值：br/>");
//循環(huán)獲取dic中的值
foreach (string strValue in dic.Values)
{
  Response.Write("value:" + strValue + "br/>");
}
Response.Write("hr/>br/>");
Response.Write("獲取dic中單個(gè)鍵和值：br/>");
Response.Write("key:100,value:" + dic[100] + "br/>");
Response.Write("hr/>br/>");
Response.Write("檢查dic中是否存在鍵（100），并返回其值dicStr：br/>");
//檢查dic中是否存在鍵（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/>");