C#实现一颗树!

 1:  static List<Entity.OA.Department> entitiesList = null;

 2:   

 3:          internal static void Reload()

 4:          {

 5:              entitiesList = (from pc in iDepartmentsRepository.GetDepartments()

 6:                              orderby pc.DeptName ascending

 7:                              select pc).ToList();

 8:          }

 9:   

10:          #region 树型部门列表

11:          /// <summary>

12:          /// 虚拟产品类别 

13:          /// </summary>

14:          /// <returns>虚拟产品类别列表</returns>

15:          public static Entity.OA.Department GetTree()

16:          {

17:              Reload();

18:              Entity.OA.Department root = new Entity.OA.Department();

19:              try

20:              {

21:                  root = entitiesList.Single(

22:                     item => item.DeptID.Equals(Entity.OA.Department.ROOTID));//获取跟节点

23:                  GetSubs(root);

24:   

25:              }

26:              catch (InvalidOperationException ex)

27:              {

28:                  ex.ToString();

29:              }

30:              return root;

31:          }

32:   

33:   

34:          /// <summary>

35:          /// 根据父对象，找到子孙树

36:          /// </summary>

37:          /// <param name="father">父对象</param>

38:          static public void GetSubs(Entity.OA.Department father)

39:          {

40:              father.SubList = entitiesList.Where(item =>

41:                  item.ParentID.Equals(father.DeptID)).ToList();

42:              father.SubList.ForEach(item =>

43:              {

44:                  item.Father = father;

45:                  GetSubs(item);      

46:              });

47:   

48:          }

49:          #endregion