急急急！dictionary中如何通过value 来获取相应的key

Question

c#编程dictionary中如何通过value 来获取相应的key

Answer 1

Demo:

var dic = new Dictionary<string, int>()
{
    {"a",1},
    {"b",2},
    {"c",3},
    {"d",1}
};foreach (var item in dic)
{    if (item.Value == 1)
    {
        Console.WriteLine(item.Key);
    }
}

Answer 2

Dictionary<string,string> dic =newDictionary<string,string>()
{{"1","one"},};var key_by_value = dic.Where(p => p.Value=="one").Select(p => p.Key);foreach(var key in key_by_value ){....}