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关键代码: 
public class MyHttpModule : IHttpModule
 {
  public void Init(HttpApplication app)
  {
   app.AuthorizeRequest += new EventHandler(app_AuthorizeRequest);
  }

  public void Dispose() {}

  protected void Rewrite(string requestedPath, System.Web.HttpApplication app)
  {
   //   app.Context.RewritePath("~/default.aspx", string.Empty, "test=tttttttt");
   foreach(URLRewrite url in SiteUrls.GetSiteUrls().Urls)
   {
    if (Regex.IsMatch(app.Context.Request.Path, url.Pattern, RegexOptions.Compiled|RegexOptions.IgnoreCase))
    {
     app.Context.RewritePath(url.Page, string.Empty, Regex.Replace(app.Context.Request.Path, url.Pattern, url.QueryString, RegexOptions.Compiled|RegexOptions.IgnoreCase));
     return;
    }
   }
   if (app.Context.Request.Path.ToLower().EndsWith(".shtml"))
   {
    app.Context.Response.Redirect("~/index.html");
   }
  }

  private void app_AuthorizeRequest(object sender, EventArgs e)
  {
   HttpApplication app = (HttpApplication) sender;
   Rewrite(app.Request.Path, app);
  }
 }

 public class SiteUrls
 {
  #region 内部属性和方法
  string SiteUrlsFile = HttpContext.Current.Server.MapPath(ConfigurationSettings.AppSettings["SiteUrls"]);
  private ArrayList _Urls;
  public ArrayList Urls
  {
   get
   {
    return _Urls;
   }
   set
   {
    _Urls = value;
   }
  }

  private NameValueCollection _Paths;
  public NameValueCollection Paths
  {
   get
   {
    return _Paths;
   }
   set
   {
    _Paths = value;
   }
  }
  
  private SiteUrls()
  {
   string applicationPath = HttpContext.Current.Request.ApplicationPath;

   if (applicationPath == "/")
   {
    applicationPath = string.Empty;
   }

   Urls = new ArrayList();
   Paths = new NameValueCollection();
   Paths.Add("home", applicationPath);

   XmlDocument xml = new XmlDocument();

   xml.Load(SiteUrlsFile);

   XmlNode root = xml.SelectSingleNode("SiteUrls");
   foreach(XmlNode n in root.ChildNodes)
   {
    if (n.NodeType != XmlNodeType.Comment && n.Name.ToLower() == "rewrite")
    {
     XmlAttribute name = n.Attributes["name"];
     XmlAttribute path = n.Attributes["path"];
     XmlAttribute page = n.Attributes["page"];
     XmlAttribute querystring = n.Attributes["querystring"];
     XmlAttribute pattern = n.Attributes["pattern"];

     if (name != null && path != null && page != null && querystring != null && pattern != null)
     {