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() {Dictionary<string, string> dic = new Dictionary<string, string>();dic.Add("1", "1");dic.Add("2", "2");dic.Add("3", "2");//foreach KeyValuePair traversingforeach (KeyValuePair<string, string> kvp in dic){if (kvp.Value.Equals("2")){ //...... kvp.Key; }}//foreach dic.Keysforeach (string key in dic.Keys){if (dic[key].Equals("2")){ //...... key }}//Linqvar keys = dic.Where(q => q.Value == "2").Select(q => q.Key); //get all keys List<string> keyList = (from q in dicwhere q.Value == "2"select q.Key).ToList<string>(); //get all keysvar firstKey = dic.FirstOrDefault(q => q.Value == "2").Key; //get first key }
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