dictionary KEY值串

Question

将key,全部组成 key1,key2,key3.............不用循环,可有办法?

Answer 1

     Dictionary<int, string> dic = new Dictionary<int, string>();
        dic.Add(1, "abc");
        dic.Add(2, "ddbc");要字符串"1,2"

Answer 2

Dictionary<string, string> dic = new Dictionary<string, string>();
            string[] keys = dic.Keys.ToArray<string>();
            string xx = string.Join(",", keys);

Answer 3

           Dictionary<int, string> dic = new Dictionary<int, string>();
            dic.Add(1, "abc");
            dic.Add(2, "ddbc");
            StringBuilder sb = new StringBuilder();
            foreach (KeyValuePair<int, string> k in dic)
                sb.Append(k.Key).Append(",");
            Console.WriteLine(sb.ToString().TrimEnd(','));
            Console.ReadLine();

Answer 4

void Main()
{
Dictionary<int, string> dic = new Dictionary<int, string>();
  dic.Add(1, "abc");
  dic.Add(2, "ddbc");
  string str=string.Join(",",dic.Select(s=>s.Key.ToString()).ToArray());
  Console.WriteLine(str); //1,2}