protected void Page_Load(object sender, EventArgs e)    {if (!IsPostBack)        {this.tvwList.Nodes.Clear();//绑定之前清除所有treeview里的节点数据            bindTree(this.tvwList.Nodes, "0");//调用绑定treeview节点方法        }    }

///<summary>/// 修改当前节点///</summary>///<param name="sender"></param>///<param name="e"></param>    protected void btnModify_Click(object sender, EventArgs e)    {if (!string.IsNullOrEmpty(this.txtUpdate.Text))        {            ProductTypeSearchModel product = new ProductTypeSearchModel();            product.TypeName=this.txtUpdate.Text;            product.TypeId = Convert.ToInt32(this.tvwList.SelectedNode.Value);if (ProductTypeSearchBLL.ModifyProductTypeSearch(product) > 0)            {                Response.Write("<script>alert('节点名称修改成功');window.location.href=window.location.href</script>");            }else            {                Response.Write("<script>alert('节点名称修改失败')</script>");            }        }else        {            Response.Write("<script>alert('节点名称不能为空')</script>");        }    }

///<summary>/// 新增节点///</summary>///<param name="sender"></param>///<param name="e"></param>    protected void btnAdd_Click(object sender, EventArgs e)    {if (!string.IsNullOrEmpty(this.txtAdd.Text))        {            ProductTypeSearchModel product = new ProductTypeSearchModel();            product.TypeName = this.txtAdd.Text;            product.TypeParentId = Convert.ToInt32(this.tvwList.SelectedNode.Value);if (ProductTypeSearchBLL.AddProductTypeSearch(product) > 0)            {                Response.Write("<script>alert('节点名称新增成功');window.location.href=window.location.href</script>");            }else            {                Response.Write("<script>alert('节点名称新增失败')</script>");            }        }else        {            Response.Write("<script>alert('节点名称不能为空')</script>");        }    }

///<summary>/// 选择节点变化时///</summary>///<param name="sender"></param>///<param name="e"></param>    protected void tvwList_SelectedNodeChanged(object sender, EventArgs e)    {this.lblNow.Text = "当前选定节点为：" + this.tvwList.SelectedNode.Text;this.txtUpdate.Text = this.tvwList.SelectedNode.Text;    }

///<summary>/// 绑定treeview///</summary>///<param name="tnc">treeview的nodes</param>///<param name="parentId">父ID</param>    protected void bindTree(TreeNodeCollection tnc, string parentId)    {//创建DataView         

        DataView dview = new DataView();        dview.Table = ProductTypeSearchBLL.GetProductTypeSearch();

//加条件        dview.RowFilter = "TypeParentId='" + parentId + "'";foreach (DataRowView rows in dview)        {            TreeNode tn = new TreeNode();            tn.Value = rows["TypeId"].ToString();            tn.Text = rows["TypeName"].ToString();

//如果实现点击节点文字展开收缩效果的话下面这句代码

//tn.SelectAction = TreeNodeSelectAction.Expand;            tnc.Add(tn);//TreeView1.Nodes.Add(tn);            DataView dv = new DataView();            dv.Table = ProductTypeSearchBLL.GetProductTypeSearch();

//判断是不是存在drv["flbh"]的ChildNodes，存在的话添加，不存在就继续遍历

            dv.RowFilter = "TypeParentId='" + rows["TypeId"].ToString() + "'";if (dv.Count != 0)            {                bindTree(tn.ChildNodes, tn.Value);            }        }    }

///<summary>/// 删除节点///</summary>///<param name="sender"></param>///<param name="e"></param>    protected void btnDel_Click(object sender, EventArgs e)    {int typeId = Convert.ToInt32(this.tvwList.SelectedNode.Value);if (ProductTypeSearchBLL.DelProductTypeSearch(typeId) > 0)        {            Response.Write("<script>alert('节点名称删除成功');window.location.href=window.location.href</script>");        }else        {            Response.Write("<script>alert('节点名称删除失败')</script>");        }    }