插入时也发生在更新之前的 EntityFramework 删除

Question

在单个 SaveChanges 中尝试（可能做的太多）时出现外键错误。

基本上我有以下 3 个像这样的 poco 实体。

    public class ClinicianAvailability
    {
        public int ClinicianAvailabilityId { get; set; }
    }

 public class SurgicalBooking
    {
        public int SurgicalBookingId
        public int? ClinicianAvailabilityId { get; set; }
        public bool IsAdhoc { get; set; }

        public virtual TheatreBooking TheatreBooking { get; set; }
        public virtual ClinicianAvailability ClinicianAvailability { get; set; }
    }

    public class TheatreBooking
    {
        public int TheatreBookingId {get;set;}

        public virtual SurgicalBooking SurgicalBooking { get; set; }
        public virtual ClinicianAvailability ClinicianAvailability { get; private set; }
    }

我基本上是在尝试删除在 SurgicalBooking 上有外键的 ClinicianAvailability。但同时尝试在 SurgicalBooking 上设置新的 TheatreBooking。

像这样：

var entity = _clinicianAvailabilityRepository.Find(resourceAvailabilityId);
    var surgStub = surgicalBookingRepository.CreateStub(bookingData.ScheduleId);
    surgStub.IsAdhoc = true;
    surgStub.ClinicianAvailabilityId = null;
surgicalBookingRepository.SetModified(surgStub, new Expression<Func<SurgicalBooking, object>>[] { x => x.IsAdhoc, x => x.ClinicianAvailabilityId });

    theatreBookingRepository.Add( new TheatreBooking
    {
                                    TheatreBooking Id = theatreBookingRepository.GetNewTempKey(),
                                    TheatreId = associatedTheatreId.Value,                           
                                    SurgicalBooking = surgStub
                                });
                                theatreBookingRepository.Add(TheatreBooking);
_clinicianAvailabilityRepository.Remove(entity);
_clinicianAvailabilityRepository.UnitOfWork.SaveChanges();

所以基本上在这样做之后，我在 ClinicianAvailabilityId 的 SurgicalBooking 外键上得到一个外键错误。如果我删除了 TheatreBooking 的添加，它会按照正确的顺序通过更新 Surgical Booking 然后删除。但是在添加剧院预订时，它会先尝试删除，然后失败。有什么帮助吗？我试图尽可能简化这一点，但这有点复杂。我试图不进行多次保存更改或将其全部放在单个事务中，因为更改所有这些代码将需要大量返工。

我查看了 ChangeTracker，所有项目似乎都按正确的顺序排列，但它并没有按那个顺序排列。

Answer 1

我尝试使用以下代码复制错误，但成功完成：

    static void CreateAndSeedDatabase()
    {
        Context context = new Context();
        ClinicianAvailability cAvail = new ClinicianAvailability() { };
        SurgicalBooking sBooking = new SurgicalBooking() { IsAdhoc = true, ClinicianAvailability = cAvail };
        context.SurgicalBookings.Add(sBooking);
        context.SaveChanges();
    }

    static void DeleteUpdateInsert()
    {
        Context context = new Context();
        ClinicianAvailability cAvail = context.ClinicianAvailabilitys.Find(1);
        SurgicalBooking sBooking = context.SurgicalBookings.Find(1);
        sBooking.IsAdhoc = false;
        sBooking.ClinicianAvailability = null;
        TheatreBooking tBooking = new TheatreBooking(){SurgicalBooking = sBooking};
        context.TheatreBookings.Add(tBooking);
        context.ClinicianAvailabilitys.Remove(cAvail);
        context.SaveChanges();
    }

上下文类：

public class Context : DbContext
{
    public Context()
    {
        Database.SetInitializer<Context>(new CreateDatabaseIfNotExists<Context>());
        Database.Initialize(true);
    }

    public DbSet<ClinicianAvailability> ClinicianAvailabilitys { get; set; }
    public DbSet<SurgicalBooking> SurgicalBookings { get; set; }
    public DbSet<TheatreBooking> TheatreBookings { get; set; }
}

修改后的 POCO 类：

public class ClinicianAvailability
{
    public int ClinicianAvailabilityId { get; set; }
}

public class SurgicalBooking
{
    public int SurgicalBookingId { get; set; }
    public bool IsAdhoc { get; set; }
    public virtual ClinicianAvailability ClinicianAvailability { get; set; }
}

public class TheatreBooking
{
    public int TheatreBookingId { get; set; }

    public virtual SurgicalBooking SurgicalBooking { get; set; }
    public virtual ClinicianAvailability ClinicianAvailability { get; private set; }
}