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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 traversing
- foreach (KeyValuePair<string, string> 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<string> keyList = (from q in dic
- where q.Value == "2"
- select q.Key).ToList<string>(); //get all keys
-
- var firstKey = dic.FirstOrDefault(q => q.Value == "2").Key; //get first key
- }

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