下拉框能绑定，为何TreeView不能绑定？

Question

ddlCategory.DataSource = ds.Tables[0].DefaultView;
ddlCategory.DataTextField = ds.Tables[0].Columns[3].ToString();
ddlCategory.DataValueField = ds.Tables[0].Columns[1].ToString();
ddlCategory.DataBind(); TreeNode myTreeNode = new TreeNode();
myTreeNode.Text = ds.Tables[0].Columns[3].ToString();
myTreeNode.Expanded = true;
tvCategory.Nodes.Add(myTreeNode);

Answer 1

TreeView 不是绑定的[除xml文件]
动态生成TreeView
DataSet ds=new DataSet(); 
        private void Form1_Load(object sender, System.EventArgs e) 
        { 
            // 定义数据库连接 
            SqlConnection CN = new SqlConnection(); 
            try  
            { 
                //初始化连接字符串 
                CN.ConnectionString=  
                "data source=pmserver;initial catalog=Bench; 
                persist security info=False;user id=sa;Password=sa;"; 
                CN.Open(); 
                //添加命令，从数据库中得到数据 
                SqlCommand sqlCmd= new SqlCommand(); 
                sqlCmd.Connection = CN; 
                sqlCmd.CommandText = "select * from tbTree"; 
                sqlCmd.CommandType = CommandType.Text ; 
                SqlDataAdapter adp = new SqlDataAdapter(sqlCmd); 
                adp.Fill(ds); 
            } 
            catch (Exception ex) 
            { 
                throw (ex);    
            } 
            finally  
            { 
                CN.Close(); 
            } 
            //调用递归函数，完成树形结构的生成 
            AddTree(0, (TreeNode)null); 
        } 
 
        // 递归添加树的节点 
        public void AddTree(int ParentID,TreeNode pNode)  
        { 
            DataView dvTree = new DataView(ds.Tables[0]); 
            //过滤ParentID,得到当前的所有子节点 
            dvTree.RowFilter =  "[PARENTID] = " + ParentID; 
            foreach(DataRowView Row in dvTree)  
            { 
                if(pNode == null)  
                {    //'̀添加根节点 
                    TreeNode Node = treeView1.Nodes.Add(Row["ConText"].ToString()); 
                    AddTree(Int32.Parse(Row["ID"].ToString()),Node);    //再次递归 
                }  
                else  
                {   //添加当前节点的子节点 
                    TreeNode Node =  pNode.Nodes.Add(Row["ConText"].ToString()); 
                    AddTree(Int32.Parse(Row["ID"].ToString()),Node);    //再次递归 
                } 
            }             
        }