protected override void OnStart(string[] args)
        {
            //一個一直重寫sitemap的服務(wù)
            aTimer.Elapsed += new ElapsedEventHandler(aTimer_Tick);
            aTimer.Enabled = true; 
            aTimer.Interval = int.Parse(PublicMethods.GetAppSettings("NewsSiteUpdateTime")) * 1000;    //配置文件中配置的秒數(shù)
            aTimer.Start();
        }

        protected override void OnStop()
        {
            this.aTimer.Enabled = false;
            this.aTimer.Stop();
        }

        /// <summary>
        /// timer定時觸發(fā)
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void aTimer_Tick(object sender, ElapsedEventArgs e)
        {
            //調(diào)用該服務(wù)的時間為上午9點——下午18點，其他時間不調(diào)用
            if (DateTime.Now.Hour >= 9 && DateTime.Now.Hour <= 19)
            {
                MakeSiteMap make = new MakeSiteMap();
                make.GetBaiDuSiteMap();
            }
        }
    }

            //查找根節(jié)點
            XmlNode root = xmlDoc.SelectSingleNode("urlset");
            //刪除以前的所有老節(jié)點
            root.RemoveAll();

            #region 平臺公告
            //查詢最新100條平臺公告
            List<IT_NEWS> platformnotice = GetPlatformNotice();
            if (platformnotice != null && platformnotice.Count > 0 && platformnotice[0].newsId > 0)
            {
                foreach (IT_NEWS platformNoticeNews in platformnotice)
                {
                    XmlElement xesub1 = xmlDoc.CreateElement("url");

                    XmlElement xe1 = xmlDoc.CreateElement("loc");
                    xe1.InnerText = "http://news.npcgo.com" + "/notice-" + platformNoticeNews.newsType + "-" + platformNoticeNews.newsId + ".html";
                    XmlElement xe2 = xmlDoc.CreateElement("lastmod");
                    xe2.InnerText = Convert.ToDateTime(platformNoticeNews.newsCreateTime).ToString("yyyy-MM-dd");
                    XmlElement xe3 = xmlDoc.CreateElement("changefreq");
                    xe3.InnerText = "daily";
                    XmlElement xe4 = xmlDoc.CreateElement("priority");
                    xe4.InnerText = "0.2";

                    xesub1.AppendChild(xe1);
                    xesub1.AppendChild(xe2);
                    xesub1.AppendChild(xe3);
                    xesub1.AppendChild(xe4);

                    root.AppendChild(xesub1);
                }
            }
            #endregion

            xmlDoc.AppendChild(root);
            xmlDoc.Save(path);
        }