HttpModule类(URL重写)

 using System;using System.Diagnostics;using System.Threading;using System.Web;using System.Xml;using System.Text.RegularExpressions;namespace UrlWriter{/// <summary>/// HttpModule类(URL重写)/// </summary>public class HttpModule : System.Web.IHttpModule{//public readonly static Mutex m=new Mutex();/// <summary>/// 实现接口的Init方法/// </summary>/// <param name="context"></param>public void Init( HttpApplication context ){context.BeginRequest += new EventHandler( ReUrl_BeginRequest );}public void Application_OnError( Object sender, EventArgs e ){}/// <summary>/// 实现接口的Dispose方法/// </summary>public void Dispose(){}/// <summary>/// 重写Url,待优化/// </summary>/// <param name="sender">事件的源</param>/// <param name="e">包含事件数据的 EventArgs</param>private void ReUrl_BeginRequest( object sender, EventArgs e ){//重写后的url如果有多级目录，最好将页面上的所有图片调用、css调用都做成绝对路径HttpContext context = ( ( HttpApplication )sender ).Context;//string forumPath = "";string requestPath = context.Request.Path.ToLower();//遍历每个url重写规则//string strTemplateid = "";foreach ( SiteUrls.URLRewrite url in SiteUrls.GetSiteUrls().Urls ){if ( Regex.IsMatch( requestPath, url.Pattern, RegexOptions.Compiled | RegexOptions.IgnoreCase ) ){//实际地址//string newUrl = Regex.Replace(requestPath.Substring(context.Request.Path.LastIndexOf("/")), url.Pattern, url.QueryString, RegexOptions.Compiled | RegexOptions.IgnoreCase);string newUrl = Regex.Replace( context.Request.Path, url.Pattern, url.QueryString, RegexOptions.Compiled | RegexOptions.IgnoreCase );//HttpContext.Current.Response.Write(context.Request.Path + "<br/>" + url.Pattern + "<br/>" + url.QueryString + "<br/>");//HttpContext.Current.Response.Write(url.Page + "<br/>" + newUrl);//HttpContext.Current.Response.End();context.RewritePath( "/" + url.Page, string.Empty, newUrl );return;}}//没有对应的重写规则，不重写context.RewritePath( "/" + requestPath );//--//}}/// <summary>/// 站点伪Url信息类/// </summary>public class SiteUrls{#region 内部属性和方法private static object lockHelper = new object();private static volatile SiteUrls instance = null;string SiteUrlsFile = HttpContext.Current.Server.MapPath( "~/xml/urls.config" );private System.Collections.ArrayList _Urls;public System.Collections.ArrayList Urls{get{return _Urls;}set{_Urls = value;}}private System.Collections.Specialized.NameValueCollection _Paths;public System.Collections.Specialized.NameValueCollection Paths{get{return _Paths;}set{_Paths = value;}}private SiteUrls(){Urls = new System.Collections.ArrayList();Paths = new System.Collections.Specialized.NameValueCollection();XmlDocument xml = new XmlDocument();xml.Load( SiteUrlsFile );XmlNode root = xml.SelectSingleNode( "urls" );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 ){Paths.Add( name.Value, path.Value );Urls.Add( new URLRewrite( name.Value, pattern.Value, page.Value.Replace( "^", "&" ), querystring.Value.Replace( "^", "&" ) ) );}}}}#endregionpublic static SiteUrls GetSiteUrls(){if ( instance == null ){lock ( lockHelper ){if ( instance == null ){instance = new SiteUrls();}}}return instance;}public static void SetInstance( SiteUrls anInstance ){if ( anInstance != null )instance = anInstance;}public static void SetInstance(){SetInstance( new SiteUrls() );}/// <summary>/// 重写伪地址/// </summary>public class URLRewrite{#region 成员变量private string _Name;public string Name{get{return _Name;}set{_Name = value;}}private string _Pattern;public string Pattern{get{return _Pattern;}set{_Pattern = value;}}private string _Page;public string Page{get{return _Page;}set{_Page = value;}}private string _QueryString;public string QueryString{get{return _QueryString;}set{_QueryString = value;}}#endregion#region 构造函数public URLRewrite( string name, string pattern, string page, string querystring ){_Name = name;_Pattern = pattern;_Page = page;_QueryString = querystring;}#endregion}}}

规则：

XML code

<?xml version="1.0" encoding="utf-8" ?>
<urls>
  <rewrite name="rss"
       path="/rss-{0}.aspx"
       pattern = "/rss(-(/d+))?.aspx"
       page="/rss.aspx"
       querystring="ID=$2" />
</urls> 

Web.config文件里还得做点修改，这个你自己到网上查查吧...
没有编译前，可以参考下面的语法
     <httpModules>
       <add type="UrlWriter.HttpModule" name="HttpModule" />
     </httpModules>