public class ResList

    {

        public int ID { get; set; }

        public List<ResList> Child { get; set; } = null;

        public int Parent { get; set; }

        public int Rank { get; set; }

    }

             List<ResList> reslist = new List<ResList>();//新的数据

             List<ResList> alllist = new List<ResList>();//原始数据

             //加载原始数据

             for (int i = ; i < ; i++)

             {

                 int j = ;

                 while (Math.Pow(, j) <= i)

                 {

                     j++;

                 }

                 alllist.Add(new ResList() { ID = i, Parent = i / , Rank = j });

             }

             //加载原始数据完成

             //下面是处理方法

             Dictionary<int, ResList> dic = new Dictionary<int, ResList>();

             foreach (ResList res in alllist)

             {

                 dic.Add(res.ID, res);

             }

             foreach (ResList res in dic.Values)

             {

                 if (dic.ContainsKey(res.Parent))

                 {

                     if (dic[res.Parent].Child == null)

                     {

                         dic[res.Parent].Child = new List<ResList>();

                     }

                     dic[res.Parent].Child.Add(res);

                 }

             }

             //得到最终的数据List

             reslist = dic.Values.Where(t => t.Parent == ).ToList();