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:
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//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/>" );
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希望本文所述对大家asp.net程序设计有所帮助。