根据数据库创建TreeView的方法

public void AddTree(int ParentID, TreeNode pNode,TreeView treeView,DataTable dt)
        {
           
             DataView dvTree = new DataView(dt);
            //过滤ParentID,得到当前的所有子节点
            //dvTree.RowFilter = "[PARENTID] = " + ParentID;
             dvTree.RowFilter = "[PARENTID]=" + ParentID;


            foreach (DataRowView Row in dvTree)
            {
           
                 TreeNode Node = new TreeNode();
                if (pNode == null)
                {    //添加根节点
                     Node.Text = Row["ConText"].ToString();
                     treeView.Nodes.Add(Node);
                    //Node.Expanded = true;
                     AddTree(Int32.Parse(Row["ID"].ToString()), Node,treeView,dt);    //再次递归
                 }
                else
                {   //̀添加当前节点的子节点
                     Node.Text = Row["ConText"].ToString();
                     pNode.Nodes.Add(Node);
                    //Node.Expanded = true;
                     AddTree(Int32.Parse(Row["ID"].ToString()), Node,treeView,dt);     //再次递归
                 }
             }
         }