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  • ASP.NET中Dictionary基本用法实例分析

    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/>");
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  • 原文地址:https://www.cnblogs.com/sjqq/p/6438824.html
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