[ADO.NET 实体数据模型][增删该查]

        public bool DataAdd(USER model)
        {
            bool isSuccess = false;
            try
            {
                using (DataBaseEntities db = new DataBaseEntities())
                {
                    db.USER.AddObject(model);
                    isSuccess = db.SaveChanges() > 0;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("异常信息："+ex.Message);
            }
            return isSuccess;
        }

        public bool DataDelete(USER model)
        {
            bool isSuccess = false;
            try
            {
                using (DataBaseEntities db = new DataBaseEntities())
                {
                    db.USER.DeleteObject(model);
                    isSuccess = db.SaveChanges() > 0;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("异常信息：" + ex.Message);
            }
            return isSuccess;
        }

        public bool DataEditor(USER model)
        {
            bool isSuccess = false;
            try
            {
                using (DataBaseEntities db = new DataBaseEntities())
                {
　　　　　　　　　　　 //只有在 DataBaseEntities 对象没有被释放时，才能实时更新对应的数据
                    USER user = db.USER.First(p => p.ID == model.ID);
                    user.NAME = model.NAME;
                    isSuccess = db.SaveChanges() > 0;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("异常信息：" + ex.Message);
            }
            return isSuccess;
        }

        public List<USER> DataSelect()
        {
            List<USER> list = new List<USER>();
            try
            {
                using (DataBaseEntities db = new DataBaseEntities())
                {
                    list = db.USER.ToList();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("异常信息：" + ex.Message);
            }
            return list;
        }