treeview 递归

         #region TreeView递归无限节点加载

         ///   <summary>
         ///  TreeView递归无限节点加载
         ///  
         ///  数据表要求-------------------------------------------------
         ///  
         ///  NodeValue（ID）   RootSign（RootID）  NodeText（Name）
         ///    001                 root              RootDisNameA
         ///                  (注释：RootText)
         ///    002                 root              RootDisNameB
         ///                  (注释：RootText)   
         ///    003                 001               RootDisNameC
         ///    004                 001               RootDisNameD
         ///    005                 001               RootDisNameE
         ///    006                 002               RootDisNameF
         ///    007                 002               RootDisNameG
         ///    008                 005               RootDisNameH
         ///    009                 007               RootDisNameI
         ///    010                 007               RootDisNameJ
         ///    011                 008               RootDisNameK
         ///    012                 011               RootDisNameL
         ///    
         ///  数据表要求------------------------------------------------
         ///  这三个字段是必须的，名字可以自定义
         ///   </summary>
         ///   <param name="tv"> 树形控件 </param>
         ///   <param name="dt"> 数据源控件 </param>
         ///   <param name="NodeText"> 节点显示的字段名 </param>
         ///   <param name="NodeValue"> 表主键编码字段名 </param>
         ///   <param name="RootSign"> 根编码字段名 </param>
         ///   <param name="RootText"> 显示根的条件内容 </param>
         public  void LoadTreeViewDt(TreeView tv, DataTable dt,  string NodeText,  string NodeValue,  string RootSign,  string RootText)
        {
             // 得到根节点信息
            DataRow[] DataRoot = dt.Select(RootSign +  " =' " + RootText +  " ' ");

             // 循环遍历根节点信息
             foreach (DataRow dr  in DataRoot)
            {
                 // 加载根节点
                TreeNode tn =  new TreeNode();
                tn.Text = dr[NodeText].ToString();
                tn.Tag = dr[NodeValue].ToString();
                tv.Nodes.Add(tn);

                 // 递归加载子节点
                LoadNodes(tn, dr, NodeText, NodeValue, RootSign, dt);
            }
        }

         private  void LoadNodes(TreeNode tn, DataRow dr,  string NodeText,  string NodeValue,  string RootSign, DataTable dt)
        {
             if (dr ==  null || tn ==  null) {  return; }

             // 得到子节点信息
            DataRow[] DataChild = dt.Select(RootSign +  " =' " + dr[NodeValue].ToString() +  " ' ");

             if (DataChild !=  null || DataChild.Length >  0)
            {
                 // 循环遍历子节点信息
                 foreach (DataRow drChild  in DataChild)
                {
                     // 加载子节点
                    TreeNode tnChild =  new TreeNode();
                    tnChild.Text = drChild[NodeText].ToString();
                    tnChild.Tag = drChild[NodeValue].ToString();
                    tn.Nodes.Add(tnChild);

                     // 形成递归
                    LoadNodes(tnChild, drChild, NodeText, NodeValue, RootSign, dt);
                }
            }
        }

         #endregion