支持QueryString的SiteMapProvider

asp.net 2.0的XmlSiteMapProvider不支持页面的QueryString，下面的代码就是在SiteMapNode上增加了一个属性reliantOn,用来支持QueryString参数
sitemap文件：

<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
  <siteMapNode url="default.aspx" title="首页"  description="">
    <siteMapNode url="~/pages/StaffViewPage.aspx" title="查看员工权限"  description="" />
    <siteMapNode url="~/pages/MyPrivilegePage.aspx" title="我的权限管理"  description="" >
      <siteMapNode title="我代理的权限" url="~/pages/agentprivilegeList.aspx"/>
      <siteMapNode title="我委托的权限" url="~/pages/consignprivilegeList.aspx"/>
      <siteMapNode title="添加委托授权" url="~/pages/agentstaffprivilegepage.aspx"/>
    </siteMapNode>
    <siteMapNode url="~/pages/ProjectIndexPage.aspx" title="系统首页"  description="" reliantOn="sysid">
      <siteMapNode url="~/pages/AllRolesViewPage.aspx" title="角色管理"  description="" reliantOn="sysid">
        <siteMapNode title="添加角色" url="~/pages/RoleAddPage.aspx" reliantOn="sysid"/>
        <siteMapNode title="编辑角色" url="~/pages/RoleEditPage.aspx" reliantOn="sysid,roleid"/>
        <siteMapNode title="管理角色" url="~/pages/RoleManagePage.aspx" reliantOn="sysid,roleid"/>
      </siteMapNode>
      <siteMapNode url="~/pages/AllOperationsViewPage.aspx" title="操作管理"  description="" reliantOn="sysid">
        <siteMapNode title="添加操作" url="~/pages/OperationsAddPage.aspx" reliantOn="sysid"/>
        <siteMapNode title="编辑操作" url="~/pages/OperationsEditPage.aspx" reliantOn="sysid,opid"/>
        <siteMapNode title="管理操作" url="~/pages/OperationsManagePage.aspx" reliantOn="sysid,opid"/>
      </siteMapNode>
      <siteMapNode url="~/pages/AllResGroupViewPage.aspx" title="资源管理"  description="" reliantOn="sysid">
        <siteMapNode title="添加资源" url="~/pages/ResGroupAddPage.aspx" reliantOn="sysid"/>
        <siteMapNode title="编辑操作" url="~/pages/ResGroupEditPage.aspx" reliantOn="sysid,resgroupid"/>
        <siteMapNode title="管理操作" url="~/pages/ResGroupManagePage.aspx" reliantOn="sysid,resgroupid"/>
      </siteMapNode>
      <siteMapNode url="~/pages/PersonalPage.aspx" title="查看员工权限"  description="" reliantOn="sysid"/>
    </siteMapNode>
  </siteMapNode>
</siteMap>

  Web.config配置

<siteMap enabled="true" defaultProvider="SiteMapDataProvider">
      <providers>
        <add name="SiteMapDataProvider" type="Tencent.OA.RightWay.Web.Components.SmartSiteMapProvider, Tencent.OA.RightWay.Web" siteMapFile="Web.sitemap"  />
      </providers>
    </siteMap>

  代码实现：

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;
using System.Collections.Specialized;
namespace Tencent.OA.RightWay.Web.Components
{
    /**//// <summary>
    /// 处理QueryString问题，通过在SiteMapNode增加reliantOn节点来解决
    /// </summary>
    public class SmartSiteMapProvider : XmlSiteMapProvider
    {
        public override void Initialize(string name, NameValueCollection attributes)
        {
            base.Initialize(name, attributes);
            this.SiteMapResolve += new SiteMapResolveEventHandler(SmartSiteMapProvider_SiteMapResolve);
        }
        /**//// <summary>
        /// 解析SiteMap节点的reliantOn，补全Request.Url的QuseryString
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        /// <returns></returns>
        SiteMapNode SmartSiteMapProvider_SiteMapResolve(object sender, SiteMapResolveEventArgs e)
        {
            if (SiteMap.CurrentNode == null)
                return null;
            SiteMapNode temp;
            temp = SiteMap.CurrentNode.Clone(true);
            Uri u = new Uri(e.Context.Request.Url.ToString());
            SiteMapNode tempNode = temp;
            while (tempNode != null)
            {
                string qs = GetReliance(tempNode, e.Context);
                if (qs != null)
                {
                    if (tempNode != null)
                    {
                        tempNode.Url += qs;
                    }
                }
                tempNode = tempNode.ParentNode;
            }
            return temp;
        }
        /**//// <summary>
        /// 解析SiteMap节点的reliantOn,组合成QueryString字符串
        /// </summary>
        /// <param name="node"></param>
        /// <param name="context"></param>
        /// <returns></returns>
        private string GetReliance(SiteMapNode node, HttpContext context)
        {
            //检查SiteMapNode节电是否支持reliance
            if (node["reliantOn"] == null)
            {
                return null;
            }
            NameValueCollection values = new NameValueCollection();
            string[] vars = node["reliantOn"].Split(",".ToCharArray());
            foreach (string s in vars)
            {
                string var = s.Trim();
                //保证querystring中存在 var 
                if (context.Request.QueryString[var] == null)
                {
                    continue;
                }
                values.Add(var, context.Request.QueryString[var]);
            }
            if (values.Count == 0)
            {
                return null;
            }
            return NameValueCollectionToString(values);
        }
        /**//// <summary>
        /// 组合成QueryString字符串
        /// </summary>
        /// <param name="col"></param>
        /// <returns></returns>
        private string NameValueCollectionToString(NameValueCollection col)
        {
            string[] parts = new string[col.Count];
            string[] keys = col.AllKeys;
            for (int i = 0; i < keys.Length; i++)
            {
                parts[i] = keys[i] + "=" + col[keys[i]];
            }
            string url = "?" + String.Join("&", parts);
            return url;
        }
    }
}