asp.net绑定树

 #region 绑定树
        private void BindTree(DataTable dt, TreeView tv,int type)
        {
            //先清空树节点
            tv.Nodes.Clear();
            //创建根节点
            TreeNode root = new TreeNode("12","1212");

            DataTable tmpdt = new DataTable();
            string platformIds = string.Empty;
            tmpdt = DBOperate.GetDataTable("select PlatformId from SupplierPlatformRelation where type=" + type + "");
            foreach (DataRow item in tmpdt.DataSet.Tables[0].Rows)
            {
                if (string.IsNullOrEmpty(platformIds))
                {
                    platformIds = item[0].ToString();
                }
                else
                {
                    platformIds += "," + item[0].ToString();
                }
            }

            foreach (DataRow item in dt.DataSet.Tables[0].Rows)
            {
                TreeNode tn = new TreeNode();
                tn.Text = item[1].ToString();
                tn.Value = item[0].ToString();
                if (string.IsNullOrEmpty(item[2].ToString()))
                {
                    tn.ToolTip = (bool)item[4] == true ? "1" : "0";
                    if (!string.IsNullOrEmpty(platformIds))
                    {
                        string[] tmps = platformIds.Split(',');
                        bool isExist = false;
                        for (int i = 0; i < tmps.Length; i++)
                        {
                            if (tmps[i].ToString() == item[0].ToString())
                            {
                                isExist = true;
                                break;
                            }
                        }
                        if (isExist)
                            tn.Checked = true;
                    }

                    //root.ChildNodes.Add(tn);
                    tv.Nodes.Add(tn);
                }
                else
                {
                    tn.ToolTip = "1";
                    foreach (TreeNode node in tv.Nodes)
                    {
                        AddNodes(node, tn, item[2].ToString(), (bool)item[4], platformIds);
                    }
                }
            }

            //tv.Nodes.Add(root);

            tv.ExpandAll();
        }

        /// <summary>
        /// 添加节点
        /// </summary>
        /// <param name="tn">根节点</param>
        /// <param name="newNode">需要添加的节点</param>
        /// <param name="parentId">父节点ID</param>
        /// <param name="isEnabled">是否有效</param>
        /// <param name="platformIds">平台集合</param>
        private void AddNodes(TreeNode tn, TreeNode newNode, string parentId, bool isEnabled, string platformIds)
        {
           
            if (tn.Value != null && tn.Value.ToString() == parentId && isEnabled)
            {
                if (!string.IsNullOrEmpty(platformIds))
                {
                    string[] tmps = platformIds.Split(',');
                    bool isExist = false;
                    for (int i = 0; i < tmps.Length; i++)
                    {
                        if (tmps[i].ToString() == newNode.Value.ToString())
                        {
                            isExist = true;
                            break;
                        }
                    }
                    if (isExist)
                        newNode.Checked = true;
                }
                tn.ChildNodes.Add(newNode);
            }
            else
            {
                for (int i = 0; i < tn.ChildNodes.Count; i++)
                {
                    if (parentId == tn.ChildNodes[i].Value.ToString() && isEnabled)
                    {
                        if (!string.IsNullOrEmpty(platformIds))
                        {
                            string[] tmps = platformIds.Split(',');
                            bool isExist = false;
                            for (int m = 0; m < tmps.Length; m++)
                            {
                                if (tmps[m].ToString() == newNode.Value.ToString())
                                {
                                    isExist = true;
                                    break;
                                }
                            }
                            if (isExist)
                                newNode.Checked = true;
                        }
                        tn.ChildNodes[i].ChildNodes.Add(newNode);
                    }
                    else
                    {
                        AddNodes(tn.ChildNodes[i], newNode, parentId, isEnabled, platformIds);
                    }
                }
            }
        }
        #endregion