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在asp.net2.0中的urlMappings倒是非常好用，可惜暂不支持正则表达式，不过，好在如果用IHttpModule的话
不管什么样的请求都会先经过IHttpModule这样就为URL重写提供了一个好机会：
下面是我写的一个IHttpModule:
using System;
using System.Web;
public class ReWriteModule:IHttpModule
{
public ReWriteModule()
{
}
public override string ToString()
{
return this.GetType().ToString();
}
void IHttpModule.Dispose()
{
}
private static System.Xml.XmlDocument ruleDoc = null;
private static System.Xml.XmlDocument GetRuleConfig(System.Web.HttpContext app)
{
if (ruleDoc == null)
{
ruleDoc = new System.Xml.XmlDocument();
ruleDoc.Load(app.Server.MapPath("~/rule.xml"));
}
return ruleDoc;
}
public static string GetUrl(System.Web.HttpContext cxt,string path)
{
System.Xml.XmlDocument doc = GetRuleConfig(cxt);
System.Xml.XmlNodeList lst= doc.GetElementsByTagName("RewriterRule");
string pat="";
foreach (System.Xml.XmlNode nd in lst)
{
System.Xml.XmlNodeList sub = nd.ChildNodes[0].ChildNodes;
foreach(System.Xml.XmlNode chk in sub)
{
pat = "^" + chk.InnerText+"$";
System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex(pat, System.Text.RegularExpressions.RegexOptions.Compiled | System.Text.RegularExpressions.RegexOptions.IgnoreCase);
if(reg.IsMatch(path))
{
return reg.Replace(path, nd.ChildNodes .InnerText);
}
}
}
return null;