HttpModule类(URL重写)

C# code

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("^", "&")));

}

}

}

}

#endregion



public 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>