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());
            }
             * */
        }