C# Dictionary（字典）的键、值排序

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 = "";