TreeView 和 Menu 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
    {
        变量 构造函数#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

        目录树(TreeView)#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

        导航菜单(Menu)#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
}