1      /// <summary> 2      /// 文件夹实体 3      /// </summary> 4      public class Folder 5      { 6          /// <summary> 7          /// 文件夹ID 8          /// </summary> 9          public int id { get; set; }10          /// <summary>11          /// 文件夹名称12          /// </summary>13          public string name { get; set; }14          /// <summary>15          /// 父级ID16          /// </summary>17          public int folder_parent_id { get; set; }18     }

 1         /// <summary> 2         /// 重构文件夹层级列表 3         /// </summary> 4         /// <param name="listSource">源数据</param> 5         /// <param name="pId">父级ID</param> 6         /// <param name="count">添加元素的次数</param> 7         /// <param name="levelNum">当前层级</param> 8         /// <param name="listResult">返回结果集</param> 9         private void RefactorFolderLevelList(List<Folder> listSource, int pId, int count, List<int> levelNum, List<Folder> listResult)10         {11             var len_source = listSource.Count();12             if (count < len_source)13             {14                 var tmp_list = listSource.Where(m => m.folder_parent_id == pId);15                 var len_tmp_list = tmp_list.Count();16                 bool addFlag = true;17                 int level = levelNum.Count();18                 int i = 0;19                 foreach (var item in tmp_list)20                 {21                     i++;22                     item.name = FillString(level, "——") + item.name;23                     var model = listResult.Where(m => m.id == item.id).FirstOrDefault();24                     if (pId == 0 && model != null)25                         continue;26                     else27                         listResult.Add(item);28                     ++count;29                     if (listSource.Where(m => m.folder_parent_id == item.id).Count() > 0)30                     {31                         if (!levelNum.Contains(item.id) && addFlag)32                         {33                             addFlag = false;34                             levelNum.Add(item.id);35                         }36                         RefactorFolderLevelList(listSource, item.id, count, levelNum, listResult);37                     }38                     else39                     {40                         if (i < len_tmp_list)41                             continue;42                         levelNum = new List<int>();43                         RefactorFolderLevelList(listSource, 0, count, levelNum, listResult);44                     }45                 }46             }47         }48         /// <summary>49         /// 字符串填充50         /// </summary>51         /// <param name="n">填充的次数</param>52         /// <param name="str">需要填充的字符串</param>53         /// <returns></returns>54         private string FillString(int n, string str)55         {56             StringBuilder ret = new StringBuilder();57             for (int i = 0; i < n; i++)58             {59                 ret.Append(str);60             }61             return ret.ToString();62         }