/// <summary>    /// 数据层    /// </summary>    public partial class GasBottles : IGasBottles    {        #region IGasBottles 成员        public Model.GasBottles GetModel(int gasBottlesID)        {            var db = DbContext.LGSCMSDataContext;            try            {                var gs = db.GasBottles.FirstOrDefault(s => s.ID == gasBottlesID);                if (gs != null)                {                    Model.GasBottles gasBottlesInfo = gs.ConvertToEntity<Model.GasBottles>();                    return gasBottlesInfo;                }            }            catch (Exception ex)            {                throw ex;            }            return null;        }        public bool Add(Model.GasBottles gasBottles)        {            bool flag = false;            try            {                var db = DbContext.LGSCMSDataContext;                DataLinqEntity.GasBottles gs = gasBottles.ConvertToEntity<DataLinqEntity.GasBottles>();                db.GasBottles.InsertOnSubmit(gs);                db.SubmitChanges();                flag = true;            }            catch (Exception ex)            {                flag = false;                throw ex;            }            return flag;        }        public bool Update(Model.GasBottles gasBottles)        {            bool flag = false;            var changedData = http://www.mamicode.com/gasBottles.ConvertToEntity();            var db = DbContext.LGSCMSDataContext;            try            {                var updateTarget = db.GasBottles.SingleOrDefault(i => i.ID == gasBottles.ID);                //CopyProperties(ref updateTarget, changedData);                changedData.GetType().GetProperties()                .Where(p => p.GetCustomAttributes(typeof(ColumnAttribute), false).Any()).ToList()                .ForEach(p => p.SetValue(updateTarget, p.GetValue(changedData, null), null));                db.SubmitChanges();                flag = true;            }            catch (Exception ex)            {                flag = false;                throw ex;            }            return flag;        }        public bool Delete(int gasBottlesID)        {            bool flag = false;            var db = DbContext.LGSCMSDataContext;            try            {                var gs = db.GasBottles.FirstOrDefault(s => s.ID == gasBottlesID);                if (gs != null)                {                    gs.deleteflag = 1;                    db.SubmitChanges();                }            }            catch (Exception ex)            {                flag = false;                throw ex;            }            return flag;        }        /// <summary>        /// 新增或更新        /// </summary>        /// <param name="gasBottles"></param>        /// <param name="gasBottlesID"></param>        /// <returns></returns>        public bool Save(Model.GasBottles gasBottles, out int gasBottlesID)        {            bool flag = false;            var changedData = http://www.mamicode.com/gasBottles.ConvertToEntity();            var db = DbContext.LGSCMSDataContext;            try            {                //=>新增                var updateTarget = db.GasBottles.SingleOrDefault(i => i.ID == gasBottles.ID);                if (updateTarget == null)                {                    db.GasBottles.InsertOnSubmit(changedData);                    db.SubmitChanges();                    gasBottlesID = changedData.ID.ToInt();                    flag = true;                }                //=>修改                else                {                    //CopyProperties(ref updateTarget, changedData);                    changedData.GetType().GetProperties()                    .Where(p => p.GetCustomAttributes(typeof(ColumnAttribute), false).Any()).ToList()                    .ForEach(p => p.SetValue(updateTarget, p.GetValue(changedData, null), null));                    db.SubmitChanges();                    gasBottlesID = updateTarget.ID.ToInt();                    flag = true;                }            }            catch (Exception ex)            {                flag = false;                throw ex;            }            return flag;        }        #endregion    }

        private void CopyProperties<T>(ref T Target, T Source)        {            foreach (PropertyInfo PI in Target.GetType().GetProperties())            {                if (PI.CanWrite && PI.CanRead)                {                    PI.SetValue(Target, PI.GetValue(Source, null), null);                }            }        }        #endregion

 public class DbContext    {        /// <summary>        ///         /// </summary>        private readonly static string connectionString = SqlHelper.SQLConnString;        #region [=>Winfrom方式]        //private static WLMQGasBottlesDataContext _WLMQGasBottlesDataContext;        ///// <summary>        /////         ///// </summary>        //public static WLMQGasBottlesDataContext WLMQGasBottlesDataContext        //{        //    get        //    {        //        return _WLMQGasBottlesDataContext ?? new WLMQGasBottlesDataContext(connectionString);        //    }        //}        #endregion        #region [=>Web方式]        public static WLMQGasBottlesDataContext WLMQGasBottlesDataContext        {            get            {                WLMQGasBottlesDataContext context = HttpContext.Current.Items["WLMQGasBottlesDataContext"] as WLMQGasBottlesDataContext;                if (context == null)                {                    context = new WLMQGasBottlesDataContext(connectionString);                    HttpContext.Current.Items["WLMQGasBottlesDataContext"] = context;                }                return context;            }        }        public static LGSCMSDataContext LGSCMSDataContext        {            get            {                LGSCMSDataContext context = HttpContext.Current.Items["LGSCMSDataContext"] as LGSCMSDataContext;                if (context == null)                {                    context = new LGSCMSDataContext(connectionString);                    HttpContext.Current.Items["LGSCMSDataContext"] = context;                }                return context;            }        }        #endregion    }