winform中树和数据库关联操作的例子（C#）

winform下树和数据库关联操作是很常用的,下面的代码是项目中用到的，从一个表生成树：

DataView?dvTree;
???????? private ? void ?InitTreeByDataSet(?TreeNodeCollection?nds,? string ?parentID,?DataSet?ds?)
???????? {
????????????dvTree? = ? new ?DataView();
????????????
????????????TreeNode?tempNode;
????????????
????????????dvTree.Table? = ?ds.Tables[ 0 ];

???????????? // 判断ParentServiceTypeID是否为null，并生成不同的过滤条件
???????????? if ?(?parentID? == ? " Isnull(ParentServiceTypeID,'Null?Column')?=?'Null?Column' " ?)
???????????? {
????????????????dvTree.RowFilter? = ?parentID?;
????????????}
???????????? else
???????????? {
????????????????dvTree.RowFilter? = ? " ParentServiceTypeID?=' " ? + ?parentID? + " ' " ;
????????????}
????????????
???????????? foreach ?(?DataRowView?drvTree? in ?dvTree?)
???????????? {
????????????????tempNode?????? = ? new ?TreeNode();
????????????????tempNode.Text? = ?drvTree[ " Name " ].ToString();
????????????????tempNode.Tag?? = ?drvTree[ " PKFieldValue " ].ToString();
????????????
????????????????nds.Add(tempNode?);

???????????????? // 递归调用
????????????????InitTreeByDataSet(?tempNode.Nodes,?tempNode.Tag.ToString(),?ds?);
????????????}
????????
????????}

两个相关的链结： 《树形结构在开发中的应用》 ，
选择树节点，显示它的详细信息