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/>" ); |
希望本文所述对大家asp.net程序设计有所帮助。