1:最直白的循环遍历方法,可以分为遍历key--value键值对以及所有的key两种表现形式
2:用Linq的方式去查询(当然了这里要添加对应的命名空间 using System.Linq)
如下为一个十分简单的代码示例:
private void GetDicKeyByValue() { Dictionarydic = new Dictionary (); dic.Add("1", "1"); dic.Add("2", "2"); dic.Add("3", "2"); //foreach KeyValuePair traversing foreach (KeyValuePair kvp in dic) { if (kvp.Value.Equals("2")) { //...... kvp.Key; } } //foreach dic.Keys foreach (string key in dic.Keys) { if (dic[key].Equals("2")) { //...... key } } //Linq var keys = dic.Where(q => q.Value == "2").Select(q => q.Key); //get all keys List keyList = (from q in dic where q.Value == "2" select q.Key).ToList (); //get all keys var firstKey = dic.FirstOrDefault(q => q.Value == "2").Key; //get first key }
原文地址:http://www.cnblogs.com/mingmingruyuedlut/archive/2013/05/23/3067227.html