实体框架6异步实体更新问题

Question

我正在使用ASP.NET Web API 2，Code First，EF 6，MS SQL Developer Server，依赖注入– Autofac开发应用程序。该应用程序具有多个层-DAL，BLL和带有控制器等的Web层。 更新操作不是自然行为。 当我通过邮递员对其进行测试时，BLL层的Update / Put方法会接收到适当的Web查询，并且应该将其转移到DAL层，在DAL层中应在db中更新已更新的实体。更新不会保存到数据库。但是，当我调试查询并使用F10 / F11逐行浏览代码时，更新会完美地更新db中的实体。 也许某些机构可以帮助解决这个问题？

public async Task<bool> Update(CustomerNotificationDTM cNotificationDtm) //BLL layer method
    {
        try
        {
            CustomerNotification customerNotification = new CustomerNotification();
            customerNotification.EmployeeId = cNotificationDtm.EmployeeId;
            customerNotification.AfterBooked = cNotificationDtm.AfterBooked;
            customerNotification.AfterRescheduled = cNotificationDtm.AfterRescheduled;
            customerNotification.AfterCancelled = cNotificationDtm.AfterCancelled;
            if(cNotificationDtm.Employee != null)
            customerNotification.Employee = ModelFactory.changeFromDTM(cNotificationDtm.Employee);

            return await Database.CustomerNotifications.Update(customerNotification) ? true : false;
        }
        catch (Exception ex) { return false; }
    }

public async Task<bool> Update(CustomerNotification notification) // DAL Layer Update method called from BLL
    {
        try
        {
            var initialNotification = await db.CustomerNotifications.FindAsync(notification.EmployeeId);
            if (initialNotification != null)
            {
                initialNotification.AfterBooked = notification.AfterBooked;
                initialNotification.AfterRescheduled = notification.AfterRescheduled;
                initialNotification.AfterCancelled = notification.AfterCancelled;

                await db.SaveChangesAsync();
                return true;
            }
        }
        catch (Exception ex) { return false;}
    }