treeview递归绑定的两种方法

方法一：

public void creattree(int fid, treenode parentnode)
           {

               datatable dt = new datatable();
               dt = op.bindgroup();
               datarow[] drs = dt.select("parentid=" + fid);
               foreach (datarow row in drs)
               {
                   if (parentnode != null)
                   {
                       treenode tempnode = new treenode();
                       tempnode.text = row["groupname"].tostring();
                       tempnode.name = row["groupid"].tostring();
                       parentnode.nodes.add(tempnode);
                       creattree(convert.toint32(row["groupid"]), tempnode);
                   }
                   else
                   {
                       treenode tempnode = new treenode();
                       tempnode.text = row["groupname"].tostring();
                       tempnode.name = row["groupid"].tostring();
                       treeview1.nodes.add(tempnode);
                       creattree(convert.toint32(row["groupid"]), tempnode);                   
                   }
               }
           }

           private void bindtree()
           {
               treeview1.nodes.clear();
               creattree(0,(treenode)null);
           }

方法二：

public void addtree(int parentid, treenode pnode)
           {
               datatable dt = new datatable();
               dt = op.bindgroup();
               dataview dvtree = new dataview(dt);
               //过滤parentid,得到当前的所有子节点  
               dvtree.rowfilter = "parentid    =    " + parentid;

               foreach (datarowview row in dvtree)
               {
                   treenode node = new treenode();
                   if (pnode == null)
                   {          //添加根节点  
                       node.text = row["groupname"].tostring();
                       treeview1.nodes.add(node);
                       //node.expanded = true;

                       addtree(int32.parse(row["groupid"].tostring()), node);          //再次递归  
                   }
                   else
                   {        //添加当前节点的子节点  
                       node.text = row["groupname"].tostring();
                       pnode.nodes.add(node);
                       //node.expanded = true;
                       addtree(int32.parse(row["groupid"].tostring()), node);            //再次递归  
                   }
               }
           }

   private void bindtree()
           {
               treeview1.nodes.clear();
               addtree(0, (treenode)null);
           }