HttpRequest,HttpModule实现重写

生产环境NetFramework 3.0或3,5

 

以下我们定义一个HttpModule类继承IHttpModule接口

 

using System;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Xml.Linq;
using System.Web;

/// <summary>
/// Summary description for HttpModule
/// </summary>
public class HttpModule:IHttpModule
{
    private static Object obj = new object();
    public void Init(HttpApplication app)
    {

     
        app.AuthenticateRequest += (object sender, EventArgs e) =>
        {       
            HttpApplication app2 = (HttpApplication)sender;
            Rewrite(app.Request.Path, app);
           
        };
    }
    /// <summary>
    /// URL 重写
    /// </summary>
    /// <param name="requestedPath"></param>
    /// <param name="app"></param>
    protected void Rewrite(string requestedPath, System.Web.HttpApplication app)
    {
        //从配置文件中读取要重写的路径

        Dictionary<string, string> rules = new Dictionary<string, string>();
        XDocument dom;
        lock (obj)
        {
            dom = XDocument.Load(HttpContext.Current.Server.MapPath("/xml/Rewrite.config"));
        }

        var query = from r in dom.Descendants("rule")
                    select r;      
        foreach (var item in query)
        {

            rules.Add(item.Attribute("pattern").Value, item.Attribute("page").Value.Replace("^", "&"));
        }     

        foreach (KeyValuePair<string, string> rule in rules)
        {
            Match match = Regex.Match(requestedPath, rule.Key, RegexOptions.IgnoreCase);
            if (match.Success)
            {
                string sendToUrl = Regex.Replace(requestedPath, rule.Key, rule.Value, RegexOptions.IgnoreCase);
                string path = sendToUrl;//虚拟路径
                string querystring = string.Empty;//查询参数
                if (sendToUrl.IndexOf("?") != -1)
                {
                    path = sendToUrl.Substring(0, sendToUrl.IndexOf("?"));
                    querystring = sendToUrl.Substring(sendToUrl.IndexOf("?") + 1);
                }

                app.Context.RewritePath(path, string.Empty, querystring);
                return;
            }
        }
    }

 public HttpModule()
 {
  
 }

  ///实现Dispose

    public void Dispose()
    {

    }
}

 

下面是重写的配置文件

<?xml version="1.0" encoding="utf-8" ?>
<Rewrite>
 <group comment="资讯栏目">
   <rule pattern="(.*?)/news/(/w+)/-(/d+).aspx" page="/news.aspx/?t=$2^k=$3"  comment="资讯最终页" />
 </group>
 <group comment="软件栏目">
  <rule pattern="(.*?)/soft/(/w+)-(/d+)/.aspx" page="/soft.aspx/?t=$2^k=$3"  comment="软件下载最终页" />
 </group>
 <group comment="音乐栏目">
  <rule pattern="(.*?)/music/(/w+)-(/d+)/.aspx" page="/music.aspx/?t=$2^k=$3"  comment="音乐最终页" />
 </group>
</Rewrite>