我遇到一个奇怪的问题,多个导航属性到同一个表。
我的FuelBunkerType POCO类配置如下:
public class FuelBunkerType : IEventReportElement
{
public long Id { get; set; }
public string TypeKey { get; set; }
public string TypeValue { get; set; }
public decimal? Sulphur { get; set; }
public decimal? Water { get; set; }
public decimal? Viscosity { get; set; }
public decimal? Density { get; set; }
public string BdnNumber { get; set; }
public long? IdEventReport { get; set; }
public long? DeactivatedByIdEventReport { get; set; }
public IList<FuelBunkerQuantity> FuelBunkerQuantitys { get; set; }
public EventReport EventReport { get; set; }
public EventReport DeactivatedByEventReport { get; set; }
}
在DbContext中,我的类配置如下:
modelBuilder.Entity<FuelBunkerType>().HasKey(x => x.Id);
if (_writeversion) modelBuilder.Entity<FuelBunkerType>().Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
else modelBuilder.Entity<FuelBunkerType>().Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
modelBuilder.Entity<FuelBunkerType>().HasRequired(x => x.EventReport).WithMany().HasForeignKey(x => x.IdEventReport);
modelBuilder.Entity<FuelBunkerType>().HasOptional(x => x.DeactivatedByEventReport).WithMany().HasForeignKey(x => x.DeactivatedByIdEventReport);
到目前为止,这么好。直到星期五,它实际上都是这样的。但是,当我尝试从表中获取数据时,生成的查询看起来像
{SELECT
1 AS [C1],
[Extent1].[Id] AS [Id],
[Extent1].[TypeKey] AS [TypeKey],
[Extent1].[TypeValue] AS [TypeValue],
[Extent1].[Sulphur] AS [Sulphur],
[Extent1].[Water] AS [Water],
[Extent1].[Viscosity] AS [Viscosity],
[Extent1].[Density] AS [Density],
[Extent1].[BdnNumber] AS [BdnNumber],
[Extent1].[IdEventReport] AS [IdEventReport],
[Extent1].[DeactivatedByIdEventReport] AS [DeactivatedByIdEventReport],
[Extent1].[EventReport_Id] AS [EventReport_Id]
FROM [FuelBunkerType] AS [Extent1]}
显然会导致&#34;列名无效&#34;错误,所以我的第一个配置行(Entity()。HasRequired(x =&gt; x.EventReport)...)被忽略。 我试着注释掉了DeactivatedByEventReport的配置,它导致了除DeactivatedByEventReport_Id之外的相同查询(如预期的那样),它只发生在同一个表的多个导航属性中。 但是,当我向EventReport添加更多导航属性时,它只会错误地查询EventReport_Id,因此当存在多个导航属性时,似乎只会忽略第一个导航属性。
为什么会发生这种情况的任何想法,以及如何解决这个问题?问候
编辑:对于与此相对应的其他类,有以下Fluent API配置:
if (_writeversion) modelBuilder.Entity<EventReport>().Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
else modelBuilder.Entity<EventReport>().Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
modelBuilder.Entity<EventReport>().HasKey(x => x.Id);
modelBuilder.Entity<EventReport>().Property(x => x.Id).HasColumnName("Id");
modelBuilder.Entity<EventReport>().Ignore(x => x.MaxEventTimeLt);
modelBuilder.Entity<EventReport>().Ignore(x => x.MaxEventTimeUtc);
modelBuilder.Entity<EventReport>().Ignore(x => x.MinEventTimeLt);
modelBuilder.Entity<EventReport>().Ignore(x => x.MinEventTimeUtc);
modelBuilder.Entity<EventReport>().Ignore(x => x.EventReportElementTyps);
modelBuilder.Entity<EventReport>().Ignore(x => x.EventsWithUpdatedSortNumber);
modelBuilder.Entity<EventReport>().Ignore(x => x.EventTimeUtcLoaded);
modelBuilder.Entity<EventReport>().Ignore(x => x.HasChanged);
modelBuilder.Entity<FuelBunkerQuantity>().HasKey(x => x.Id);
if (_writeversion) modelBuilder.Entity<FuelBunkerQuantity>().Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
else modelBuilder.Entity<FuelBunkerQuantity>().Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
modelBuilder.Entity<FuelBunkerQuantity>().HasOptional(x => x.FuelBunkerType).WithMany().HasForeignKey(x => x.IdFuelBunkerType);
//modelBuilder.Entity<FuelBunkerQuantity>().HasOptional(x => x.EventReport).WithMany().HasForeignKey(x => x.IdEventReport);
modelBuilder.Entity<FuelBunkerQuantity>().Ignore(x => x.EventReport);
EventReport上的配置不应该影响任何东西,因为你可以看到我在FuelBunkerQuantity上禁用导航属性来尝试是否导致错误,但它没有改变错误或结果查询一点点。
EDIT2:类EventReport:
public class EventReport
{
public long Id { get; set; }
public long? SortNumber { get; set; }
public string ReportType { get; set; }
public DateTime? CreationTimeUtc { get; set; }
public DateTime? EventTimeUtc { get; set; }
public DateTime? EventTimeUtcLoaded { get; set; }
public DateTime? EventTimeLt { get; set; }
public long? EventDuration { get; set; }
public DateTime? LastSendAtUtc { get; set; }
public DateTime? LastSendAtLt { get; set; }
public DateTime? FirstSendAtUtc { get; set; }
public DateTime? FirstSendAtLt { get; set; }
public string EventQualityState { get; set; }
public bool IsDraft { get; set; }
[IgnoreOnEqualCheck]
public IEnumerable<FuelBunkerRob> FuelRoB { get; set; }
[IgnoreOnEqualCheck]
public IEnumerable<OilBunkerRob> OilRoB { get; set; }
[IgnoreOnEqualCheck]
public List<FuelBunkerType> ActiveFuelTypes { get; set; }
[IgnoreOnEqualCheck]
public DateTime? MaxEventTimeUtc { get; set; }
[IgnoreOnEqualCheck]
public DateTime? MaxEventTimeLt { get; set; }
[IgnoreOnEqualCheck]
public DateTime? MinEventTimeUtc { get; set; }
[IgnoreOnEqualCheck]
public DateTime? MinEventTimeLt { get; set; }
public List<EventReport> EventsWithUpdatedSortNumber {get; set;}
public long? ConfigurationId { get; set; }
public bool HasChanged { get; set; }
public List<IEventReportElement> EventReportElements { get; set; }
}
EDIT3:我刚刚跳过导致错误的Statement。原来FuelBunkerQuantity也有错误的翻译(参见编辑中的配置):
{SELECT
1 AS [C1],
[Extent1].[Id] AS [Id],
[Extent1].[IdFuelBunkerType] AS [IdFuelBunkerType],
[Extent1].[MassDelta] AS [MassDelta],
[Extent1].[MassAbsolut] AS [MassAbsolut],
[Extent1].[IdEventReport] AS [IdEventReport],
[Extent1].[FuelBunkerType_Id] AS [FuelBunkerType_Id]
FROM [FuelBunkerQuantity] AS [Extent1]}
似乎有些东西坏了,但我不知道是什么。
答案 0 :(得分:1)
当您在EventReport
和FuelBunkerType
之间配置两个一对一的关系时,在多方面只有一个集合,EF无法匹配这些关系。根据集合属性ActiveFuelTypes
所属的关系,您可以像这样明确地映射它:
modelBuilder.Entity<FuelBunkerQuantity>().
HasOptional(x => x.FuelBunkerType).
WithMany(e => e.ActiveFuelTypes).
HasForeignKey(x => x.IdFuelBunkerType);