ProcessRequest事件有关问题

public void ProcessRequest(HttpContext context)
        {
            if (context == null) return;
            string url = context.Request.CurrentExecutionFilePath;
            if (url.StartsWith("/fckeditor", StringComparison.CurrentCultureIgnoreCase) == false)
            {
                List<RegexInfo> _regex_list = BLL.CacheHepler.RewriterCache.ReadRewriterRule(context);
                foreach (RegexInfo r in _regex_list)
                {
                    //建立正则表达式
                    Regex Reg = new Regex(r.NewPath, RegexOptions.IgnoreCase);
                    Match m = Reg.Match(RawUrl);//匹配
                    if (m.Success)//成功
                    {
                        RawUrl = Reg.Replace(RawUrl, r.RealPath);//匹配出其真实的URL
                        context.Server.Execute(RawUrl);
                        context.Response.End();
                        return;
                    }
                }
                IHttpHandler hander = BuildManager.CreateInstanceFromVirtualPath(RawUrl, typeof(Page)) as IHttpHandler;
                hander.ProcessRequest(context);
            }
        }