处理在多参数情况下分页参数的完整性

给自己看的

   private  string geturl()

        {

            string ResultUrl = Request.Url.AbsoluteUri;

            ResultUrl = Regex.Replace(ResultUrl, @"page=(\d+)\&?", string.Empty, RegexOptions.IgnoreCase);

            if (ResultUrl.LastIndexOf("?") > 0)

            {

                if (ResultUrl.LastIndexOf("&") + 1 != ResultUrl.Length)

                {

                    if (ResultUrl.LastIndexOf("?") + 1 < ResultUrl.Length)

                        ResultUrl = ResultUrl + "&";

                }

            }

            else

                ResultUrl = ResultUrl + "?";

            return ResultUrl;

        }