winform中生成TreeView树

无论是webform还是winform，TreeView都是常用功能。使用递归方法很方便。

下面分享一个小实例。

数据库中3个字段，分别是：ID,itemType_name,itemType_PID

 

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private void itemType_Load(object sender, EventArgs e)         {             dataBind();         }             private void dataBind()         {               //获取数据             string sql = "select * from itemType order by itemType_paixu";               DB db = new DB();             string _msg = "";             DataTable DT = db.GetDt(sql, out _msg);             //               treeView1.Nodes.Clear();               //添加顶节点             TreeNode tempNode = new TreeNode();             tempNode.Text = "商品类别";             tempNode.Name = "0";             treeView1.Nodes.Add(tempNode);             //               nodeBind(treeView1, DT, "0", tempNode);             treeView1.ExpandAll();             //         }           public void nodeBind(TreeView _treeView, DataTable _dt, string _filter, TreeNode _pNode)         {               //循环构建树             string sFilter = "itemType_PID=" + _filter;             TreeNode parentNode = _pNode;               DataView dv = new DataView(_dt);               dv.RowFilter = sFilter;             if (dv.Count > 0)             {                 foreach (DataRowView drv in dv)                 {                     TreeNode tempNode = new TreeNode();                       tempNode.Text = drv["itemType_name"].ToString();                     tempNode.Name = drv["ID"].ToString();                         if (parentNode != null)                         parentNode.Nodes.Add(tempNode);                     else                         _treeView.Nodes.Add(tempNode);                       nodeBind(_treeView, _dt, drv["ID"].ToString(), tempNode);                 }             }         }

　　上面这个例子是有固定根节点的，下面这个例子是没有根节点的，递归构建更方便。

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private void codeitem_Load(object sender, EventArgs e)         {             dataBind();         }           private void dataBind()         {               //获取数据             string sql = "select * from codeitem order by codeitem_paixu";               DB db = new DB();             string _msg = "";             DataTable DT = db.GetDt(sql, out _msg);             //               treeView1.Nodes.Clear();             nodeBind(treeView1, DT, "0", null);             treeView1.ExpandAll();             //         }           public void nodeBind(TreeView _treeView, DataTable _dt, string _filter, TreeNode _pNode)         {               //循环构建树             string sFilter = "codeitem_pcode=’" + _filter + "’";             TreeNode parentNode = _pNode;               DataView dv = new DataView(_dt);               dv.RowFilter = sFilter;             if (dv.Count > 0)             {                 foreach (DataRowView drv in dv)                 {                     TreeNode tempNode = new TreeNode();                       tempNode.Text = drv["codeitem_name"].ToString();                     tempNode.Name = drv["ID"].ToString();                         if (parentNode != null)                         parentNode.Nodes.Add(tempNode);                     else                         _treeView.Nodes.Add(tempNode);                       nodeBind(_treeView, _dt, drv["codeitem_code"].ToString(), tempNode);                 }             }         }

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