TreeView 循环加载数据

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<span style="white-space:pre"></span>TblAreaBLL bll = new TblAreaBLL();        private void button1_Click(object sender, EventArgs e)        {            LoadDataToTree(this.treeView1.Nodes, bll.GetTblAreaListByID(0));        }        private void LoadDataToTree(TreeNodeCollection treeNode, List<TblArea> list)        {            foreach (TblArea arr in list)            {                TreeNode tree = treeNode.Add(arr.AreaName);                tree.Tag = arr.AreaId;                LoadDataToTree(tree.Nodes, bll.GetTblAreaListByID(arr.AreaId)); //递归循环            }        }        private void button2_Click(object sender, EventArgs e)        {            List<TblArea> list = bll.GetTblAreaList(); //获取所有的城市升级列表            LoadDataToTree2(this.treeView1.Nodes, list, 0); //先加载所有省级列表        }        private void LoadDataToTree2(TreeNodeCollection treeNode, List<TblArea> list, int pid)        {            foreach (TblArea arr in list)            {                if (arr.AreaPId == pid)                {                    TreeNode tree = treeNode.Add(arr.AreaName);                    tree.Tag = arr.AreaId;                    LoadDataToTree2(tree.Nodes, list, arr.AreaId); //递归循环  直接在集合中查询。                }            }        }        //删除节点下的所有数据        private void button3_Click(object sender, EventArgs e)        {            TreeNode node = this.treeView1.SelectedNode;            if (node != null)            {                int areaId = (int)node.Tag;                bll.DeleteTblAreaDiGui(areaId);                this.treeView1.SelectedNode.Remove();                MessageBox.Show("删除成功！");            }        }
from: http://www.cnblogs.com/han1982/p/4060440.html
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