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1. using System.Configuration;
2. using System.Diagnostics;
3. using System.Text.RegularExpressions;
4. using System.Web;
5. using System.Xml;
6.  
7. // nicked from http://www.codeproject.com/aspnet/URLRewriter.asp
8.     public class URLRewriter : IConfigurationSectionHandler {
9.         public static log4net.ILog Logger = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
10.         protected XmlNode _oRules = null;
11.  
12.         protected URLRewriter() { }
13.  
14.         public string GetSubstitution(string zPath) {
15.             Regex oReg;
16.  
17.             foreach (XmlNode oNode in _oRules.SelectNodes("rule")) {
18.                 // get the url and rewrite nodes
19.                 XmlNode oUrlNode = oNode.SelectSingleNode("url");
20.                 XmlNode oRewriteNode = oNode.SelectSingleNode("rewrite");
21.  
22.                 // check validity of the values
23.                 if (oUrlNode == null || string.IsNullOrEmpty(oUrlNode.InnerText)
24.                     || oRewriteNode == null || string.IsNullOrEmpty(oRewriteNode.InnerText)) {
25.                     Logger.Warn("Invalid urlrewrites rule discovered in web.config file.");
26.                     continue;
27.                 }
28.  
29.                 oReg = new Regex(oUrlNode.InnerText, RegexOptions.IgnoreCase);
30.  
31.                 // if match, return the substitution
32.                 Match oMatch = oReg.Match(zPath);
33.                 if (oMatch.Success) {
34.                     return oReg.Replace(zPath, oRewriteNode.InnerText);
35.                 }
36.             }
37.  
38.             return null; // no rewrite
39.         }
40.  
41.         public static void Process() {
42.             URLRewriter oRewriter = (URLRewriter)System.Configuration.ConfigurationManager.GetSection("urlrewrites");
43.  
44.             string zSubst = oRewriter.GetSubstitution(HttpContext.Current.Request.Path);
45.  
46.             if (!string.IsNullOrEmpty(zSubst)) {
47.                 Logger.InfoFormat("Rewriting url '{0}' to '{1}' ", HttpContext.Current.Request.Path, zSubst);
48.                 HttpContext.Current.RewritePath(zSubst);
49.             }
50.         }
51.  
52.         #region Implementation of IConfigurationSectionHandler
53.         public object Create(object parent, object configContext, XmlNode section) {
54.             _oRules = section;
55.  
56.             return this;
57.         }
58.         #endregion
59.     }

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