/// <summary>
        /// 删除eSight对象,从数据库中。
        /// </summary>
        /// <returns></returns>
        public bool DeleteESight()
        {
            CheckInit();//是否不存在eSight对象。
            IHWESightHostDal hwESightHostDal = HWESightHostDal.Instance;

            if (this.HWESightHost.ID > 0)
            {
                hwESightHostDal.DeleteESight(this.HWESightHost.ID);
            }
            else
            {
                LogUtil.HWLogger.API.WarnFormat("This eSight host has not add to the database,IP:{0}", HWESightHost.HostIP);
            }
            return(true);
        }
        /// <summary>
        /// 根据ID删除一个eSight,删除内存和数据库。
        /// </summary>
        /// <param name="id">eSight id</param>
        /// <returns>成功失败。</returns>
        public bool RemoveESSession(int id)
        {
            bool isNotFind = true;
            IList <HWESightHost> hostList = ListESHost();

            foreach (HWESightHost host in hostList)
            {
                if (host.ID == id)
                {
                    LogUtil.HWLogger.API.InfoFormat("Begining to delete eSight: [{0}, {1}]", host.HostIP, host.ID);
                    RemoveESSession(host.HostIP);
                    isNotFind = false;
                }
            }
            if (isNotFind)
            {//多删除一次,在数据库中。 没找到时。
                IHWESightHostDal hwESightHostDal = HWESightHostDal.Instance;
                hwESightHostDal.DeleteESight(id);
                LogUtil.HWLogger.API.InfoFormat("deleted eSight: [{0}]", id);
            }
            return(true);
        }