/// <summary>
        /// 批量插入
        /// </summary>
        /// <param name="entityList"></param>
        public bool BulkInsert(List<T> entityList)
        {
            try
            {
                db.BulkInsert(entityList);
                db.SaveChanges();
                return true;
            }
            catch (Exception e)
            {
                return false;
            }
        }

/// <summary>
        /// 批量更新
        /// </summary>
        /// <param name="entityList"></param>
        public void UpdateEntityList(List<T> entityList)
        {
            foreach (var item in entityList)
            {
                db.Set<T>().Attach(item);
                db.Entry<T>(item).State = EntityState.Modified;
                db.Entry<T>(item).Property("CreateDate").IsModified = false;
                db.Entry<T>(item).Property("CreateUser").IsModified = false;
            }
            db.SaveChanges();
        }