1

我有 2 节课：

public class FlightCostInfo : BaseEntity<Guid>
{
  public Flight FlightInfo { get; set; }
  public virtual ICollection<Cost> Costs { get; set; }
  public virtual ICollection<PriceCalculationNotification> Notifications { get; set; }
  public Guid CalculationResultId { get; set; }
}

public class Cost : BaseEntity<Guid>
{
  public BasePrice Price { get; set; }
  public decimal Amount { get; set; }
  public Vendor Vendor { get; set; }
  public Guid FlightCostInfoId { get; set; }
}

并为他们映射：

internal class FlightCostInfoMapping : EntityTypeConfiguration<FlightCostInfo>
    {
        public FlightCostInfoMapping()
        {
            HasKey(i => i.Id);
            Property(i => i.CalculationResultId).HasColumnName("CalculationResult_Id");
            HasOptional(i => i.FlightInfo);
            HasMany(i => i.Costs).WithRequired().HasForeignKey(c => c.FlightCostInfoId);
            HasMany(i => i.Notifications).WithRequired().HasForeignKey(n => n.FlightCostInfoId);
        }
    }

internal class CostMapping : EntityTypeConfiguration<Cost>
{
    public CostMapping()
    {
        HasKey(c => c.Id);
        Property(c => c.FlightCostInfoId).HasColumnName("FlightCostInfo_Id");
        HasRequired(c => c.Price);
        HasRequired(c => c.Vendor);
    }
}

当我保存每个包含一个或多个 Cost 对象的 FlightCostInfo 列表时，我收到以下错误：

违反了多重性约束。角色FlightCostInfo_Costs_Source的关系Charges.Infrastructure.DataAccess.FlightCostInfo_Costs有多重性 1 或 0..1

我不知道为什么会这样。有人可以帮忙吗？

更新：保存 FlightCostInfo 列表的代码：

        public virtual void Save(IEnumerable<TObject> entities)
        {
            Context.Configuration.AutoDetectChangesEnabled = false;
            entities.ToList().ForEach(entity => 
            {
                if (Equals(entity.Id, default(TKey)) || !Context.ChangeTracker.Entries<TObject>().ToList().Any(dbEntry => dbEntry.Entity.Id.Equals(entity.Id)))
                {
                    Set.Add(entity);
                }
            });

            Context.ChangeTracker.DetectChanges();
            SaveChanges();
            Context.Configuration.AutoDetectChangesEnabled = true;
        }

        protected void SaveChanges()
        {
            var entriesWithGuidKey = Context.ChangeTracker.Entries<BaseEntity<Guid>>().Where(e => e.Entity.Id == Guid.Empty).ToList();
            entriesWithGuidKey.ForEach(e => e.Entity.Id = Guid.NewGuid());

            var entriesWithPeriodicValidity = Context.ChangeTracker.Entries<IPeriodicValidityObject>().ToList();
            entriesWithPeriodicValidity.ForEach(e => 
                {
                   if (e.State != System.Data.EntityState.Unchanged)
                   {
                       e.Entity.ChangedDate = DateTime.UtcNow;
                   }
                });
            Context.SaveChanges();
        }
4

1 回答 1

2

问题似乎在于 BaseEntity 的 Equals 重载。所以 EF 认为 FlightCostInfo 集合中的所有 Cost 对象都是相等的。

结束问题

于 2012-09-20T14:19:35.483 回答