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 protected void Application_BeginRequest(Object sender, EventArgs e)
  {

   
   
   string strRawUrl = HttpContext.Current.Request.RawUrl;
   string strNewUrl;

   //*******************************************************************************************
   //分类地址重写
   if (Regex.IsMatch(strRawUrl, @"Post.aspx", RegexOptions.IgnoreCase))
   {
    strNewUrl = Regex.Replace(strRawUrl, @"Post.aspx", @"ShowClass.aspx\?ClassID=14");

    HttpContext.Current.RewritePath( strNewUrl );
   }
   else if (Regex.IsMatch(strRawUrl, @"Resources.aspx", RegexOptions.IgnoreCase))
   {
    strNewUrl = Regex.Replace(strRawUrl, @"Resources.aspx", @"ShowClass.aspx\?ClassID=13");

    HttpContext.Current.RewritePath( strNewUrl );
   }
   else if (Regex.IsMatch(strRawUrl, @"MobileApplications.aspx", RegexOptions.IgnoreCase))
   {
    strNewUrl = Regex.Replace(strRawUrl, @"MobileApplications.aspx", @"ShowClass.aspx\?ClassID=12");

    HttpContext.Current.RewritePath( strNewUrl );
   }
   else if (Regex.IsMatch(strRawUrl, @"Server.aspx", RegexOptions.IgnoreCase))
   {
    strNewUrl = Regex.Replace(strRawUrl, @"Server.aspx", @"ShowClass.aspx\?ClassID=11");

    HttpContext.Current.RewritePath( strNewUrl );
   }

   else if (Regex.IsMatch(strRawUrl, @"DataBase.aspx", RegexOptions.IgnoreCase))
   {
    strNewUrl = Regex.Replace(strRawUrl, @"DataBase.aspx", @"ShowClass.aspx\?ClassID=10");

    HttpContext.Current.RewritePath( strNewUrl );
   }
   else if (Regex.IsMatch(strRawUrl, @"WebServices.aspx", RegexOptions.IgnoreCase))
   {
    strNewUrl = Regex.Replace(strRawUrl, @"WebServices.aspx", @"ShowClass.aspx\?ClassID=7");

    HttpContext.Current.RewritePath( strNewUrl );
   }

   else if (Regex.IsMatch(strRawUrl, @"WindowsApplications.aspx", RegexOptions.IgnoreCase))
   {
    strNewUrl = Regex.Replace(strRawUrl, @"WindowsApplications.aspx", @"ShowClass.aspx\?ClassID=6");

    HttpContext.Current.RewritePath( strNewUrl );
   }

  else if (Regex.IsMatch(strRawUrl, @"WebApplications.aspx", RegexOptions.IgnoreCase))
   {
    strNewUrl = Regex.Replace(strRawUrl, @"WebApplications.aspx", @"ShowClass.aspx\?ClassID=2");

    HttpContext.Current.RewritePath( strNewUrl );
   }
   //**********************************************************************************************
   //显示详细文章地址重写
   else if (Regex.IsMatch(strRawUrl, @"(\d+).aspx", RegexOptions.IgnoreCase))
   {
    strNewUrl = Regex.Replace(strRawUrl, @"(\d+).aspx", @"ShowPost.aspx\?id=$1");

    HttpContext.Current.RewritePath( strNewUrl );
   }
   else if (Regex.IsMatch(strRawUrl, @"ShowPost.aspx\?id=(\d+)", RegexOptions.IgnoreCase))
   {
    strNewUrl = Regex.Replace(strRawUrl, @"ShowPost.aspx\?id=(\d+)", @"$1.aspx");

    HttpContext.Current.Response.Redirect( strNewUrl );
   }
}
前面是重写。后面是逆操作.
效果见HTtp://ithero.net