一种加载TreeView数据的新写法

今天在MSDN看到一篇文章，受到启发，便用下面的方式实现TreeView的数据加载。因为使用了spring来注入业务方法，所以不完全贴上代码了，只贴上关键部分。

         ///   <summary>
         ///  执行数据显示
         ///   </summary>
         public   void  showTree()
        {
            image1  =  Resources.home.ToBitmap();
            image2  =  Resources.department.ToBitmap();
            image3  =  Resources.users.ToBitmap();

            imageList.Images.Add(image1);
            imageList.Images.Add(image2);
            imageList.Images.Add(image3);

             if  (treeDataSupportImpl  ==   null )
            {
                treeDataSupportImpl  =  (ITreeDataSupport)AppUtils.getObject( " treeDataSupportImpl " );
            }

             //  获取数据
            IList treeDataList =  treeDataSupportImpl.GetTreeData( false ,  false );
            IList empOrPosList  =   new  List < IDictionary > ();
             if  (isLoadEmployee  ||  isLoadPosition)
            {
                empOrPosList  =  treeDataSupportImpl.GetTreeData(isLoadEmployee, isLoadPosition);
            }
            log.Debug(treeDataList.Count);
             if  (treeDataList.Count  >   0   &&  treeDataList  !=   null )
            {
                 //  转换为DataTable
                 this .converListToDataTable(treeDataList);

                 //  调用数据展现方法
                log.Debug( " 开始创建、、、 " );
                 this .createTree( 0 ,(TreeNode) null );

                 //  如果有数，则加载
                 if  (empOrPosList.Count  >   0   &&  empOrPosList  !=   null )
                {
                     this .addTree(empOrPosList);
                }

            }
        }

         ///   <summary>
         ///  添加员工或职称到树
         ///   </summary>
         ///   <param name="list"></param>
         public   void  addTree(IList list)
        {
             foreach  (IDictionary empOrPos  in  list)
            {
                TreeNode newNode  =   new  TreeNode();
                newNode.Name  =  empOrPos[ " ORG_ID " ].ToString();
                newNode.Text  =  empOrPos[ " ORG_NAME " ].ToString();
                newNode.ImageIndex  =   2 ;
                newNode.SelectedImageIndex  =   2 ;
                TreeNode node  =  myTreeView.Nodes.Find(empOrPos[ " SUPER_ORG_ID " ].ToString(),  true )[ 0 ];
                node.Nodes.Add(newNode);
            }
        }

         ///   <summary>
         ///  创建树
         ///   </summary>
         ///   <param name="ParentID"></param>
         ///   <param name="pNode"></param>
         public   void  createTree( int  ParentID,TreeNode pNode)
        {
            DataView dvTree  =   new  DataView(treeData);
            dvTree.RowFilter  =   " [SUPER_ORG_ID] =  "   +  ParentID;

             foreach  (DataRowView Row  in  dvTree)
            {
                 if (pNode  ==   null )
                {
                    log.Debug( " 根节点： "   +  Row[ " ORG_NAME " ].ToString());
                     //  添加根节点
                    myTreeView.ImageList  =  imageList;
                    TreeNode node  =  myTreeView.Nodes.Add(Row[ " ORG_NAME " ].ToString());
                    node.Name  =  Row[ " ORG_ID " ].ToString();
                    node.ImageIndex  =   0 ;
                    node.SelectedImageIndex  =   0 ;
                     //  递归
                    createTree(Int32.Parse(Row[ " ORG_ID " ].ToString()),node);    
                }
                 else
                {
                    log.Debug( " 节点： "   +  Row[ " ORG_NAME " ].ToString());
                     //  添加当前节点
                    TreeNode node  =   pNode.Nodes.Add(Row[ " ORG_NAME " ].ToString());
                    node.Name  =  Row[ " ORG_ID " ].ToString();
                     if (Row[ " ORG_TYPE_ID " ].ToString().Equals( " 2 " )  ||  Row[ " ORG_TYPE_ID " ].ToString().Equals( " 3 " ))
                    {
                        node.ImageIndex  =   1 ;
                        node.SelectedImageIndex  =   1 ;
                    }
                     else
                    {
                        node.ImageIndex  =   2 ;
                        node.SelectedImageIndex  =   2 ;
                    }

                     // 再次递归
                    createTree(Int32.Parse(Row[ " ORG_ID " ].ToString()),node);
                }
            }

        }

         ///   <summary>
         ///  转换函数
         ///   </summary>
         ///   <param name="list"></param>
         public   void  converListToDataTable(IList list)
        {
            DataColumn dataColumn  =  treeData.Columns.Add( " ORG_ID " ,  typeof (Int32));
            dataColumn.AllowDBNull  =   false ;
            treeData.Columns.Add( " ORG_NAME " ,  typeof (String));
            treeData.Columns.Add( " SUPER_ORG_ID " ,  typeof (Int32));
            treeData.Columns.Add( " ORG_TYPE_ID " ,  typeof (Int32));

             foreach  (IDictionary dict  in  list)
            {
                DataRow row  =  treeData.NewRow();
                row[ " ORG_ID " ]  =  dict[ " ORG_ID " ];
                row[ " ORG_NAME " ]  =  dict[ " ORG_NAME " ];
                row[ " SUPER_ORG_ID " ]  =  dict[ " SUPER_ORG_ID " ];
                row[ " ORG_TYPE_ID " ]  =  dict[ " ORG_TYPE_ID " ];
                treeData.Rows.Add(row);
            }
             /*
            foreach (DataRow row in treeData.Rows)
            {
                log.Debug(row["ORG_ID"].ToString() + " | " + row["ORG_NAME"].ToString() + " | " + row["SUPER_ORG_ID"].ToString() + " | " + row["ORG_TYPE_ID"].ToString());
            }
             *  */
        }