[转帖]treeview的用法
TreeView和Menu都是用于导航，且与数据库绑定时的用法也极为相近，下面给出两个实例，请比较业务层的绑定方法。
1. Tree.aspx
1. Tree.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Tree.aspx.cs" Inherits="NavTree"
EnableViewState="false" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>LeftMenu_Tree</title></head><body bgcolor="#DDEDFD"> <form id="form1" runat="server"> <asp:LinkButton ID="lbtExpand" runat="server" OnClick="lbtExpand_Click" ToolTip="全部展开"> 全部展开 </asp:LinkButton> <asp:LinkButton ID="lbtCollapse" runat="server" OnClick="lbtCollapse_Click" Visible="false"> 全部收缩 </asp:LinkButton> <asp:TreeView ID="tvMenu" SkinID="tvClass" runat="server" ShowLines="true" NodeWrap="false"> </asp:TreeView> </form></body></html>2. Tree.aspx.cs
using System;using System.Data;using System.Data.SqlClient;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;public partial class NavTree : System.Web.UI.Page{
Sys.BLL.Navigation myBiz = new Sys.BLL.Navigation(); private void Page_Load(object sender, System.EventArgs e)
{
if (!Page.IsPostBack) { BindTree();
} } protected void BindTree() { //根据当前用户ID加载目录树 myBiz.BindTree(tvMenu, Framework.Globals.CurrentUser.UserID); } //全部展开节点 protected void lbtExpand_Click(object sender, EventArgs e) { tvMenu.ExpandAll(); lbtExpand.Visible = false; lbtCollapse.Visible = true; } //全部折叠节点 protected void lbtCollapse_Click(object sender, EventArgs e) { tvMenu.CollapseAll(); lbtExpand.Visible = true; lbtCollapse.Visible = false; }}3. Menu.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Menu.aspx.cs" Inherits="NavMenu" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>Top</title></head><body> <form id="form1" runat="server"> <asp:Menu ID="Menu1" runat="server" BackColor="#f1f1f1" ForeColor="Black" Font-Size="12px" Font-Names="宋体" BorderColor="background" BorderStyle="Solid" BorderWidth="0px" StaticSubMenuIndent="10px" Height="20px" Orientation="Horizontal" StaticEnableDefaultPopOutImage="False"> <StaticMenuItemStyle HorizontalPadding="5px" VerticalPadding="2px" BorderWidth="1px" BorderColor="#f1f1f1" /> <StaticHoverStyle BackColor="#cccccc" BorderColor="background" BorderStyle="Solid" BorderWidth="1px" /> <DynamicHoverStyle BackColor="#C6DDFE" BorderColor="background" BorderStyle="Solid" BorderWidth="0px" /> <DynamicMenuStyle BackColor="Menu" BorderStyle="Outset" BorderWidth="1px" HorizontalPadding="2px" VerticalPadding="0px" BorderColor="MenuBar" /> <DynamicMenuItemStyle HorizontalPadding="2px" VerticalPadding="2px" /> </asp:Menu> </form></body></html>4. Menu.aspx.cs
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;public partial class NavMenu : System.Web.UI.Page{ Sys.BLL.Navigation myBiz = new Sys.BLL.Navigation(); protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { myBiz.BindMenu(Menu1); } }}5. 业务层：App_Code/Sys.BLL.Navigation.cs
using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;namespace Sys.BLL{ /// <summary> /// 系统导航 业务层 /// </summary> public class Navigation : Framework.BLL.BizObject { #region 变量 构造函数 Sys.DAL.Navigation myData = new Sys.DAL.Navigation(); string ImagePath = Framework.Globals.WebRoot + "Images/"; /// <summary> /// 系统导航 /// </summary> public Navigation() { } #endregion #region 目录树(TreeView) DataTable ds_TreeView; /// <summary> /// 根据当前用户ID加载目录树 /// </summary> public void BindTree(TreeView tvMenu, int userID) { ds_TreeView = myData.BindTree(userID).Tables[0]; if (ds_TreeView.Rows.Count > 0) BindTree(tvMenu, 0, (TreeNode)null); } private void BindTree(TreeView tvMenu, int ParentID, TreeNode pNode) { string NodeId = "MenuID"; string NodeName = "MenuName"; string ParentId = "ParentID"; string Url = "Url"; string Icon = "Icon"; DataView dvTree = new DataView(ds_TreeView); //过滤ParentId,得到当前的所有子节点 dvTree.RowFilter = ParentId + " = " + ParentID; foreach (DataRowView drv in dvTree) { TreeNode Node = new TreeNode(); if (pNode == null) { //添加根节点 string nodename = drv[NodeName].ToString().Trim(); string nodeid = drv[NodeId].ToString().Trim(); Node.Text = nodename; Node.ToolTip = nodename; Node.Value = nodeid; Node.Target = "main"; if (drv[Icon].ToString().Trim() == string.Empty) { Node.ImageUrl = ImagePath + "menu/ie.gif"; } else { Node.ImageUrl = ImagePath + "menu/" + drv[Icon].ToString().Trim(); } //导航模式 & 选择模式 //要使一个节点处于导航模式，请将该节点的 NavigateUrl 属性值设置为空字符串 ("") 以外的值 //若要使节点处于选择模式，请将节点的 NavigateUrl 属性设置为空字符串。 Node.NavigateUrl = ""; Node.SelectAction = TreeNodeSelectAction.Expand; Node.Expanded = false; Node.PopulateOnDemand = false; tvMenu.Nodes.Add(Node); //***注意区别:根节点 BindTree(null, Int32.Parse(nodeid), Node); //再次递归 } else { //?添加当前节点的子节点 string nodename = drv[NodeName].ToString().Trim(); string nodeid = drv[NodeId].ToString().Trim(); Node.Text = nodename; Node.ToolTip = nodename; Node.Value = nodeid; Node.Target = "main"; if (drv[Icon].ToString().Trim() == string.Empty) { Node.ImageUrl = ImagePath + "menu/ie.gif"; }//默认图标 else { Node.ImageUrl = ImagePath + "menu/" + drv[Icon].ToString().Trim(); } Node.NavigateUrl = drv[Url].ToString(); Node.SelectAction = TreeNodeSelectAction.Expand; Node.Expanded = false; Node.PopulateOnDemand = false; pNode.ChildNodes.Add(Node); //***注意区别:子节点 BindTree(null, Int32.Parse(nodeid), Node); //再次递归 } } } #endregion #region 导航菜单(Menu) DataTable ds_BindMenu; /// <summary> /// 加载获取导航菜单 /// </summary> public void BindMenu(Menu tvMenu) { ds_BindMenu = myData.BindMenu().Tables[0]; if (ds_BindMenu.Rows.Count > 0) BindMenu(tvMenu, 0, (MenuItem)null); } /// <summary> /// 加载获取导航菜单 /// </summary> private void BindMenu(Menu tvMenu, int ParentID, MenuItem pNode) { DataView dvTree = new DataView(ds_BindMenu); dvTree.RowFilter = "ParentId =" + ParentID;//过滤ParentId,得到当前的所有子节点 foreach (DataRowView drv in dvTree) { int id = Convert.ToInt32(drv["ID"]); int parentID = Convert.ToInt32(drv["ParentID"]); string text = drv["Text"].ToString(); string value = drv["Value"] == DBNull.Value ? string.Empty : drv["Value"].ToString(); string imageUrl = drv["ImageUrl"] == DBNull.Value ? string.Empty : drv["ImageUrl"].ToString(); string navigateUrl = drv["NavigateUrl"] == DBNull.Value ? string.Empty : drv["NavigateUrl"].ToString(); string target = drv["Target"] == DBNull.Value ? string.Empty : drv["Target"].ToString(); MenuItem item = new MenuItem(); if (pNode == null) { //添加根节点 item.Text = text; item.Value = value; item.Target = target; if (imageUrl == string.Empty) { item.ImageUrl = ImagePath + "winXP/winxp_folder.gif"; } else { item.ImageUrl = imageUrl; } item.NavigateUrl = navigateUrl; item.Selectable = true; tvMenu.Items.Add(item); //***注意区别:根节点 BindMenu(null, id, item); //再次递归 }//检索 else { //?添加当前节点的子节点 item.Text = text; item.Value = value; item.Target = target; if (imageUrl == string.Empty) { item.ImageUrl = ImagePath + "winXP/winxp_folder.gif"; } else { item.ImageUrl = imageUrl; } item.NavigateUrl = navigateUrl; item.Selectable = true; pNode.ChildItems.Add(item); //***注意区别:子节点 BindMenu(null, id, item); //再次递归 } } } #endregion }//class end}