Asp.net MVC Booked StartDate 和 EndDate 检查

Question

我想检查我的第一次预订 res2.StartDate 和 res2.EndDate 是否与特定房间的 res1.StartDate 和 res1.EndDate 不同。 而且不在 res1.StartDate 和 res1.EndDate 之间，所以我可以预订房间。

我已经这样做了

var result = from r in _reservationData.GetAll()
             .Where(r => r.RoomId == reservation.RoomId)
             .Where(r => r.StartDate == reservation.StartDate)
             .Where(r => r.EndDate == reservation.EndDate)
                     orderby r.StartDate
                     select r;

但这只是检查它们是否相等。 如何检查预订 2 期间是否不在预订 1 期间之间？

先感谢您。

这是未更新：

private bool CheckIfThisRoomIsAvailable(Reservation reservation)
    {
        // return the room data
        var result3 = _roomData.GetById(reservation.RoomId);

        // return the reservations of this room and 
        // check if the startdate of the new reservation
        // is greater than the enddate of the old reservation
        var result1 = from r in _reservationData.GetAll()
            .Where(r => (r.RoomId == reservation.RoomId)
             && !(r.EndDate < reservation.StartDate))
                      select r;

        /* return the reservations of this room and check if the startdate  
         of the new reservation less than the enddate of old reservation
         and check if the enddate of the new reservation is less than 
         the startdate of the old reservation
        */
        var result2 = from r in _reservationData.GetAll()
             .Where(r => (r.RoomId == reservation.RoomId)
              && !(r.EndDate > reservation.StartDate)
              && !(r.StartDate > reservation.EndDate))
                      select r;

        // checking condtions
        if (!result3.Status.Contains("Available"))
        {
            return false;
        }

        else if (result1 is null)
        {
            return true;
        }

        else if (result2 is null)
        {
            return true;
        }

        else
        { return false; }
    }

但问题是如果条件，result1 或 2 为空，它返回 false？？

Answer 1

我用这种情况解决了这个问题：

var canIBookTheRoom =
            !_reservationData.GetAll()
            .Where(r => r.RoomId == reservation.RoomId)
            .Where(r => (r.StartDate <= reservation.EndDate)
                && (r.EndDate >= reservation.StartDate)).ToList().Any();

        // checking condtions
        if (!result3.Status.Contains("Available"))
        {
            return false;
        }
        else if (canIBookTheRoom) 
        { return true; }
        else return false;

我希望这可以帮助任何人！