Question

我目前在一个页面上工作，我可以列出帐户中的所有预订但遇到问题。我想访问分配到预订房间的所有房产，但我不太确定如何实现这一目标。

预订表：

房型：

public class Room
{
    public int RoomID { get; set; }

    public int RoomNumber { get; set; }

    public string RoomType { get; set; }

    public string Image { get; set; }

    public int Price { get; set; }

    public int Adults { get; set; }

    public int Childs { get; set; }

    public bool SmokingRoom { get; set; }

    public bool IsOccupied { get; set; }

    public Floor Floor { get; set; }

    public virtual ICollection<Booking> Bookings { get; set; }
 }

预订模式：

public class Booking
{
    public int BookingID { get; set; }

    public Account Account { get; set; }

    public DateTime DateOfReservation { get; set; }

    public DateTime Arrival { get; set; }

    public DateTime Departure { get; set; }

    public int Adults { get; set; }

    public int Children { get; set; }

    public Room Room { get; set; }

    public bool CheckIn { get; set; }

    public bool CheckOut { get; set; }

    public string Status { get; set; }

    }

Databasehandler方法：

        public static List<Booking> GetAllBookingsByAccount(int id)
        {
        HotelDbContext context = new HotelDbContext();

        var bookings = context.Bookings.Where(b => b.Account.AccountID == id).ToList();

        return bookings;
        }

查看：

    @if (Model.Bookings.Count != 0)
    {
        <table>
            <thead>
                <tr>
                    <th>Arrival</th>
                    <th>Departure</th>
                    <th>Hotel</th>
                    <th>Room</th>
                    <th>Persons</th>
                    <th>Price</th>
                    <th>Status</th>
                </tr>
            </thead>
            <tbody>
                @foreach (var booking in Model.Bookings)
                {
                    <tr>
                        <td>@booking.Arrival.ToShortDateString()</td>
                        <td>@booking.Departure.ToShortDateString()</td>
                        <td></td>
                        <td></td>
                        <td></td>
                        <td></td>
                        <td>@booking.TotalPersons</td>
                        <td></td>
                        <td>@booking.Status</td>
                    </tr>
                }
            </tbody>
        </table>
    }
    else
    {
        <p>You currently do not have any bookings.</p>
    }

感谢您的时间！

Answer 1

要使延迟加载工作，您需要将属性设置为虚拟，以便EF能够覆盖该属性。这意味着您不必调用Include方法。

将您的数据模型更新为：

public class Booking
{
    public int BookingID { get; set; }

    public virtual Account Account { get; set; }

    public DateTime DateOfReservation { get; set; }

    public DateTime Arrival { get; set; }

    public DateTime Departure { get; set; }

    public int Adults { get; set; }

    public int Children { get; set; }

    public virtual Room Room { get; set; }

    public bool CheckIn { get; set; }

    public bool CheckOut { get; set; }

    public string Status { get; set; }
}

这将使EF能够延迟加载，并且您将能够访问该实体的所有属性，而无需任何额外的代码。

Answer 2

您需要在预订时包含房间：

var bookings = context.Bookings.Include("Room").Where(b => b.Account.AccountID == id).ToList();

如何从表中的ID访问属性

2 个答案: