C# Dictionary（字典）的键、值排序

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Dictionary<string, string> dic1 = new Dictionary<string, string>();

      dic1.Add("ddd","123");
      dic1.Add("aaa", "123");
      dic1.Add("ccc", "123");
      dic1.Add("fff", "123");
      dic1.Add("eee", "123");
      dic1.Add("bbb", "123");
      Dictionary<string, string> dic1Asc = dic1.OrderBy(o => o.Key).ToDictionary(o => o.Key, p => p.Value);
      Dictionary<string, string> dic1desc = dic1.OrderByDescending(o => o.Key).ToDictionary(o => o.Key, p => p.Value);

      Dictionary<string, string> dic1Asc1
        = (from d in dic1
           orderby d.Key ascending
           select d).ToDictionary(k => k.Key, v => v.Value);
      Dictionary<string, string> dic1desc2
        = (from d in dic1
           orderby d.Key descending
           select d).ToDictionary(k => k.Key, v => v.Value);

      List<string> list = new List<string>();
      list.Add("aaa");
      list.Add("ddd");
      list.Add("bbb");
      list.Add("ccc");
      list.Add("bbb");
      var ascList = list.OrderBy(o => o);
      var descList = list.OrderByDescending(o => o);

      var ascList1 = (from l in list
                      orderby l ascending
                      select l).ToList();
      var descList2 = (from l in list
                       orderby l descending
                       select l).ToList();

string str = "";