EF6 数据库优先：违反多重约束。关系“...”的角色“...”具有多重性 1 或 0..1
EF6 Database-First: Multiplicity constraint violated. The role '...' of the relationship '...' has multiplicity 1 or 0..1
我遇到错误
Multiplicity constraint violated. The role 'CollectionSite_CollectionSiteOption_Target' of the relationship 'DatabaseRefreshRecovery.Data.CollectionSite_CollectionSiteOption' has multiplicity 1 or 0..1.
我不知道是什么原因。
从我发现的 Google 结果来看，这个错误似乎与更新分离的实体有关。我什么都不做。从数据库中检索数据时出现此错误。
我在桌面应用程序中使用 EF6。这些实体是一对一的关系，其中 SiteID 在父 table (CollectionSite) 中用作主键，在子 table (CollectionSiteOption).
下面是我的 classes，导致错误的代码行，以及 classes 的上下文部分。有没有人看到我可能遗漏的任何内容或知道可能发生了什么？
CollectionSite class:
namespace DatabaseRefreshRecovery.Models
{
public class CollectionSite
{
public CollectionSite()
{
AlereSites = new List<AlereSite>();
AtnSites = new List<AtnSite>();
ClientCollSites = new List<ClientCollSite>();
CollectionSiteCarriers = new List<CollectionSiteCarrier>();
//CollectionSiteExtra = new CollectionSiteExtra();
CollectionSiteGroups = new List<CollectionSiteGroups>();
ClinicAttributesAssignments = new List<ClinicAttributesAssignment>();
CollectionSiteMultiples = new List<CollectionSiteMultiple>();
CollectionSiteOption = new CollectionSiteOption();
CollectionSitePanels = new List<CollectionSitePanel>();
CrlSites = new List<CrlSite>();
CsAddresses = new List<CsAddress>();
//HoursOfOperation = new HoursOfOperation();
ReimbursementHistories = new List<ReimbursementHistory>();
SiteDynamicServices = new List<SiteDynamicService>();
SiteServicesAndPrices = new List<SiteServicesAndPrice>();
UserProfiles = new List<UserProfile>();
}
[Key]
public int SiteID { get; set; }
public string Sitestate { get; set; }
public int Machid { get; set; }
public short Labpsc { get; set; }
public string Labid { get; set; }
public string AmexId { get; set; }
public string Payaccount { get; set; }
public string Ratingid { get; set; }
public short Active { get; set; }
public string Comments { get; set; }
public string Privatecomments { get; set; }
public string Name { get; set; }
public int? Mroid { get; set; }
public int? Datamgmt { get; set; }
public int? Internalsite { get; set; }
public int? Testsite { get; set; }
public Guid MsreplTranVersion { get; set; }
public int? Taxexempsig { get; set; }
public int? Reportinghold { get; set; }
public int? Orderhold { get; set; }
public int Backgroundsallowed { get; set; }
public bool AllowPsychemedicsHairTestingForClinicsClients { get; set; }
public bool IncludeInLabAccountSync { get; set; }
public bool AllowSsnsearch { get; set; }
public bool Electronicdotallowed { get; set; }
public bool ClinicOptedInForRandomsProgram { get; set; }
public bool? Clinicuploadenabled { get; set; }
public int ServiceQueueTypeId { get; set; }
public int FrontOfficeCheckInGroupMode { get; set; }
public bool Advancedsearch123allowed { get; set; }
public bool? IsLabFriendly { get; set; }
public string LabCorpSupplyId { get; set; }
public string LabCorpSupplyPhoneNumber { get; set; }
public string LabCorpCourierPhoneNumber { get; set; }
public virtual List<AlereSite> AlereSites { get; set; }
public virtual List<AtnSite> AtnSites { get; set; }
public virtual List<ClientCollSite> ClientCollSites { get; set; }
public virtual List<CollectionSiteCarrier> CollectionSiteCarriers { get; set; }
//public virtual CollectionSiteExtra CollectionSiteExtra { get; set; }
public virtual List<CollectionSiteGroups> CollectionSiteGroups { get; set; }
public virtual List<CollectionSiteMultiple> CollectionSiteMultiples { get; set; }
public virtual List<ClinicAttributesAssignment> ClinicAttributesAssignments { get; set; }
public virtual CollectionSiteOption CollectionSiteOption { get; set; }
public virtual List<CollectionSitePanel> CollectionSitePanels { get; set; }
public virtual List<CrlSite> CrlSites { get; set; }
public virtual List<CsAddress> CsAddresses { get; set; }
//public virtual HoursOfOperation HoursOfOperation { get; set; }
public virtual List<ReimbursementHistory> ReimbursementHistories { get; set; }
public virtual List<SiteDynamicService> SiteDynamicServices { get; set; }
public virtual List<SiteServicesAndPrice> SiteServicesAndPrices { get; set; }
public virtual List<UserProfile> UserProfiles { get; set; }
}
}
CollectionSiteOption class:
namespace DatabaseRefreshRecovery.Models
{
public class CollectionSiteOption
{
[Key, ForeignKey("CollectionSite")]
public int Siteid { get; set; }
public string Attainbilltonum { get; set; }
public int? Posonlyreviewcontract { get; set; }
public int? Backgroundscontract { get; set; }
public int? _24hours { get; set; }
public int? Averifycontract { get; set; }
public string Connectiontype { get; set; }
public string Ispnumber { get; set; }
public string Userid { get; set; }
public string Password { get; set; }
public Guid MsreplTranVersion { get; set; }
public DateTime? CliaExpirationDate { get; set; }
[XmlIgnore]
public virtual CollectionSite CollectionSite { get; set; }
}
}
CollectionSite 的 DBContext：
public DbSet<CollectionSite> CollectionSites { get; set; }
流利API...
//
modelBuilder.Entity<CollectionSite>().ToTable("COLLECTIONSITE");
modelBuilder.Entity<CollectionSite>().Property(p => p.MsreplTranVersion).HasColumnName("msrepl_tran_version");
modelBuilder.Entity<CollectionSite>().Property(p => p.SiteID).HasColumnName("SITEID");
modelBuilder.Entity<CollectionSite>().Property(p => p.AmexId).HasColumnName("AMEX_ID");
modelBuilder.Entity<CollectionSite>().Property(p => p.MsreplTranVersion).HasColumnName("msrepl_tran_version");
modelBuilder.Entity<CollectionSite>().HasMany<ClinicAttributesAssignment>(x => x.ClinicAttributesAssignments).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteId);
modelBuilder.Entity<CollectionSite>().HasMany<AlereSite>(x => x.AlereSites).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteId);
modelBuilder.Entity<CollectionSite>().HasMany<AtnSite>(x => x.AtnSites).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasMany<ClientCollSite>(x => x.ClientCollSites).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasMany<CollectionSiteCarrier>(x => x.CollectionSiteCarriers).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteID);
//modelBuilder.Entity<CollectionSite>().HasOptional<CollectionSiteExtra>(x => x.CollectionSiteExtra).WithRequired(x => x.CollectionSite);
modelBuilder.Entity<CollectionSite>().HasMany<CollectionSiteMultiple>(x => x.CollectionSiteMultiples).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasOptional<CollectionSiteOption>(x => x.CollectionSiteOption).WithRequired(x => x.CollectionSite);
modelBuilder.Entity<CollectionSite>().HasMany<CollectionSitePanel>(x => x.CollectionSitePanels).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteId);
modelBuilder.Entity<CollectionSite>().HasMany<CrlSite>(x => x.CrlSites).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasMany<CsAddress>(x => x.CsAddresses).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasMany<ReimbursementHistory>(x => x.ReimbursementHistories).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteId);
modelBuilder.Entity<CollectionSite>().HasMany<SiteDynamicService>(x => x.SiteDynamicServices).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteId);
modelBuilder.Entity<CollectionSite>().HasMany<SiteServicesAndPrice>(x => x.SiteServicesAndPrices).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasMany<UserProfile>(x => x.UserProfiles).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
//modelBuilder.Entity<CollectionSite>().HasOptional<HoursOfOperation>(x => x.HoursOfOperation).WithRequired(x => x.CollectionSite);
modelBuilder.Entity<CollectionSite>().HasMany<CollectionSiteGroups>(x => x.CollectionSiteGroups).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
CollectionSiteOption 的 DBContext：
public DbSet<CollectionSiteOption> CollectionSiteOptions { get; set; }
流利API...
//
modelBuilder.Entity<CollectionSiteOption>().HasKey(e => e.Siteid);
modelBuilder.Entity<CollectionSiteOption>().ToTable("COLLECTIONSITEOPTIONS", "dbo");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Siteid).HasColumnName("SITEID");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Attainbilltonum)
.HasColumnName("ATTAINBILLTONUM")
.HasMaxLength(15)
.IsUnicode(false);
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Averifycontract).HasColumnName("AVERIFYCONTRACT");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Backgroundscontract).HasColumnName("BACKGROUNDSCONTRACT");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.CliaExpirationDate).HasColumnType("datetime");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Connectiontype)
.HasColumnName("CONNECTIONTYPE")
.HasMaxLength(30)
.IsUnicode(false);
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Ispnumber)
.HasColumnName("ISPNUMBER")
.HasMaxLength(10)
.IsUnicode(false);
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.MsreplTranVersion).HasColumnName("msrepl_tran_version");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Password)
.HasColumnName("PASSWORD")
.HasMaxLength(10)
.IsUnicode(false);
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Posonlyreviewcontract).HasColumnName("POSONLYREVIEWCONTRACT");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Userid)
.HasColumnName("USERID")
.HasMaxLength(30)
.IsUnicode(false);
modelBuilder.Entity<CollectionSiteOption>().Property(e => e._24hours).HasColumnName("24HOURS");
违规代码方法：
我在有问题的代码行前面加上 *---> 和 <---* 前缀。
private CollectionSite GetCollectionSiteInformation(int siteID)
{
CollectionSite collectionSite = new CollectionSite();
SendMessageToUser($"Retrieving the collection site for '{siteID}'.");
collectionSite = Context.CollectionSites.Where(o => o.SiteID == siteID).SingleOrDefault();
SendMessageToUser($"Retrieving the clinic attribute assignments & value assignments for '{siteID}'.");
collectionSite.ClinicAttributesAssignments = Context.ClinicAttributesAssignment.Where(x => x.SiteId == siteID).Include(x => x.ClinicAttributesValueAssignments).ToList();
SendMessageToUser($"Retrieving the Alere sites for '{siteID}'.");
collectionSite.AlereSites = Context.AlereSites.Where(x => x.SiteId == siteID).ToList();
SendMessageToUser($"Retrieving the Atn sites for '{siteID}'.");
collectionSite.AtnSites = Context.AtnSites.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the client collection sites for '{siteID}'.");
collectionSite.ClientCollSites = Context.ClientCollSites.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the collection site carrier for '{siteID}'.");
collectionSite.CollectionSiteCarriers = Context.CollectionSiteCarrier.Where(x => x.SiteID == siteID).ToList();
//SendMessageToUser($"Retrieving the collection site extras for '{siteID}'.");
//collectionSite.CollectionSiteExtra = Context.CollectionSiteExtras.Where(x => x.Siteid == siteID).SingleOrDefault();
SendMessageToUser($"Retrieving the collection site multiples for '{siteID}'.");
collectionSite.CollectionSiteMultiples = Context.CollectionSiteMultiples.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the collection site groups for '{siteID}'.");
collectionSite.CollectionSiteGroups = Context.CollectionSiteGroups.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the collection site options for '{siteID}'.");
*--->collectionSite.CollectionSiteOption = Context.CollectionSiteOptions.Where(x => x.Siteid == siteID).SingleOrDefault();<---*
SendMessageToUser($"Retrieving the collection site panels for '{siteID}'.");
collectionSite.CollectionSitePanels = Context.CollectionSitePanels.Where(x => x.SiteId == siteID).ToList();
SendMessageToUser($"Retrieving the CRL sites for '{siteID}'.");
collectionSite.CrlSites = Context.CrlSites.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the collection site addresses for '{siteID}'.");
collectionSite.CsAddresses = Context.CsAddresses.Where(x => x.Siteid == siteID).Include(x => x.Address).ToList();
SendMessageToUser($"Retrieving the reimbursement histories for '{siteID}'.");
collectionSite.ReimbursementHistories = Context.ReimbursementHistory.Where(x => x.SiteId == siteID).ToList();
SendMessageToUser($"Retrieving the site dynamic services for '{siteID}'.");
collectionSite.SiteDynamicServices = Context.SiteDynamicServices.Where(x => x.SiteId == siteID).ToList();
SendMessageToUser($"Retrieving the site services & prices for '{siteID}'.");
collectionSite.SiteServicesAndPrices = Context.SiteServicesAndPrices.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the user profiles for '{siteID}'.");
collectionSite.UserProfiles = Context.UserProfiles.Where(x => x.Siteid == siteID).Include(x => x.Mach).ToList();
//SendMessageToUser($"Retrieving the hours of operation for '{siteID}'.");
//collectionSite.HoursOfOperation = Context.HoursOfOperation.Where(x => x.Siteid == siteID).SingleOrDefault();
return collectionSite;
}
堆栈跟踪：
at System.Data.Entity.Core.Objects.EntityEntry.WillNotRefSteal(EntityReference refToPrincipal, IEntityWrapper wrappedPrincipal)
at System.Data.Entity.Core.Objects.EntityEntry.FixupEntityReferenceToPrincipal(EntityReference relatedEnd, EntityKey foreignKey, Boolean setIsLoaded, Boolean replaceExistingRef)
at System.Data.Entity.Core.Objects.EntityEntry.FixupReferencesByForeignKeys(Boolean replaceAddedRefs, EntitySetBase restrictTo)
at System.Data.Entity.Core.Objects.ObjectStateManager.FixupReferencesByForeignKeys(EntityEntry newEntry, Boolean replaceAddedRefs)
at System.Data.Entity.Core.Objects.ObjectStateManager.AddEntry(IEntityWrapper wrappedObject, EntityKey passedKey, EntitySet entitySet, String argumentName, Boolean isAdded)
at System.Data.Entity.Core.Common.Internal.Materialization.Shaper.HandleEntityAppendOnly[TEntity](Func`2 constructEntityDelegate, EntityKey entityKey, EntitySet entitySet)
at System.Data.Entity.Core.Common.Internal.Materialization.Coordinator`1.ReadNextElement(Shaper shaper)
at System.Data.Entity.Core.Common.Internal.Materialization.Shaper`1.SimpleEnumerator.MoveNext()
at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
at DatabaseRefreshRecovery.Processess.Clinics.GetCollectionSiteInformation(Int32 siteID) in C:\development\escreen\DEV-TOOLS\DatabaseRefreshRecoveryTool\DatabaseRefreshRecovery\Processes\Clinics.cs:line 137
at DatabaseRefreshRecovery.Processess.Clinics.RetrieveUserData() in C:\development\escreen\DEV-TOOLS\DatabaseRefreshRecoveryTool\DatabaseRefreshRecovery\Processes\Clinics.cs:line 48
at DatabaseRefreshRecovery.DatabaseRefreshRecoveryForm.ProcessCollectionSites() in C:\development\escreen\DEV-TOOLS\DatabaseRefreshRecoveryTool\DatabaseRefreshRecovery\DatabaseRefreshRecoveryForm.cs:line 159
at DatabaseRefreshRecovery.DatabaseRefreshRecoveryForm.ProcessBackup() in C:\development\escreen\DEV-TOOLS\DatabaseRefreshRecoveryTool\DatabaseRefreshRecovery\DatabaseRefreshRecoveryForm.cs:line 88
通过添加 .Map() 定义外键解决了我的问题。认为外键需要在一对一关系上定义，但不知道如何定义，我通过 API 找到的一对一关系示例没有定义它。
modelBuilder.Entity<CollectionSite>().HasOptional<CollectionSiteOption>(x => x.CollectionSiteOption).WithRequired(x => x.CollectionSite).Map(x => x.MapKey("Siteid"));
我遇到错误
Multiplicity constraint violated. The role 'CollectionSite_CollectionSiteOption_Target' of the relationship 'DatabaseRefreshRecovery.Data.CollectionSite_CollectionSiteOption' has multiplicity 1 or 0..1.
我不知道是什么原因。
从我发现的 Google 结果来看，这个错误似乎与更新分离的实体有关。我什么都不做。从数据库中检索数据时出现此错误。
我在桌面应用程序中使用 EF6。这些实体是一对一的关系，其中 SiteID 在父 table (CollectionSite) 中用作主键，在子 table (CollectionSiteOption).
下面是我的 classes，导致错误的代码行，以及 classes 的上下文部分。有没有人看到我可能遗漏的任何内容或知道可能发生了什么？
CollectionSite class:
namespace DatabaseRefreshRecovery.Models
{
public class CollectionSite
{
public CollectionSite()
{
AlereSites = new List<AlereSite>();
AtnSites = new List<AtnSite>();
ClientCollSites = new List<ClientCollSite>();
CollectionSiteCarriers = new List<CollectionSiteCarrier>();
//CollectionSiteExtra = new CollectionSiteExtra();
CollectionSiteGroups = new List<CollectionSiteGroups>();
ClinicAttributesAssignments = new List<ClinicAttributesAssignment>();
CollectionSiteMultiples = new List<CollectionSiteMultiple>();
CollectionSiteOption = new CollectionSiteOption();
CollectionSitePanels = new List<CollectionSitePanel>();
CrlSites = new List<CrlSite>();
CsAddresses = new List<CsAddress>();
//HoursOfOperation = new HoursOfOperation();
ReimbursementHistories = new List<ReimbursementHistory>();
SiteDynamicServices = new List<SiteDynamicService>();
SiteServicesAndPrices = new List<SiteServicesAndPrice>();
UserProfiles = new List<UserProfile>();
}
[Key]
public int SiteID { get; set; }
public string Sitestate { get; set; }
public int Machid { get; set; }
public short Labpsc { get; set; }
public string Labid { get; set; }
public string AmexId { get; set; }
public string Payaccount { get; set; }
public string Ratingid { get; set; }
public short Active { get; set; }
public string Comments { get; set; }
public string Privatecomments { get; set; }
public string Name { get; set; }
public int? Mroid { get; set; }
public int? Datamgmt { get; set; }
public int? Internalsite { get; set; }
public int? Testsite { get; set; }
public Guid MsreplTranVersion { get; set; }
public int? Taxexempsig { get; set; }
public int? Reportinghold { get; set; }
public int? Orderhold { get; set; }
public int Backgroundsallowed { get; set; }
public bool AllowPsychemedicsHairTestingForClinicsClients { get; set; }
public bool IncludeInLabAccountSync { get; set; }
public bool AllowSsnsearch { get; set; }
public bool Electronicdotallowed { get; set; }
public bool ClinicOptedInForRandomsProgram { get; set; }
public bool? Clinicuploadenabled { get; set; }
public int ServiceQueueTypeId { get; set; }
public int FrontOfficeCheckInGroupMode { get; set; }
public bool Advancedsearch123allowed { get; set; }
public bool? IsLabFriendly { get; set; }
public string LabCorpSupplyId { get; set; }
public string LabCorpSupplyPhoneNumber { get; set; }
public string LabCorpCourierPhoneNumber { get; set; }
public virtual List<AlereSite> AlereSites { get; set; }
public virtual List<AtnSite> AtnSites { get; set; }
public virtual List<ClientCollSite> ClientCollSites { get; set; }
public virtual List<CollectionSiteCarrier> CollectionSiteCarriers { get; set; }
//public virtual CollectionSiteExtra CollectionSiteExtra { get; set; }
public virtual List<CollectionSiteGroups> CollectionSiteGroups { get; set; }
public virtual List<CollectionSiteMultiple> CollectionSiteMultiples { get; set; }
public virtual List<ClinicAttributesAssignment> ClinicAttributesAssignments { get; set; }
public virtual CollectionSiteOption CollectionSiteOption { get; set; }
public virtual List<CollectionSitePanel> CollectionSitePanels { get; set; }
public virtual List<CrlSite> CrlSites { get; set; }
public virtual List<CsAddress> CsAddresses { get; set; }
//public virtual HoursOfOperation HoursOfOperation { get; set; }
public virtual List<ReimbursementHistory> ReimbursementHistories { get; set; }
public virtual List<SiteDynamicService> SiteDynamicServices { get; set; }
public virtual List<SiteServicesAndPrice> SiteServicesAndPrices { get; set; }
public virtual List<UserProfile> UserProfiles { get; set; }
}
}
CollectionSiteOption class:
namespace DatabaseRefreshRecovery.Models
{
public class CollectionSiteOption
{
[Key, ForeignKey("CollectionSite")]
public int Siteid { get; set; }
public string Attainbilltonum { get; set; }
public int? Posonlyreviewcontract { get; set; }
public int? Backgroundscontract { get; set; }
public int? _24hours { get; set; }
public int? Averifycontract { get; set; }
public string Connectiontype { get; set; }
public string Ispnumber { get; set; }
public string Userid { get; set; }
public string Password { get; set; }
public Guid MsreplTranVersion { get; set; }
public DateTime? CliaExpirationDate { get; set; }
[XmlIgnore]
public virtual CollectionSite CollectionSite { get; set; }
}
}
CollectionSite 的 DBContext：
public DbSet<CollectionSite> CollectionSites { get; set; }
流利API...
//
modelBuilder.Entity<CollectionSite>().ToTable("COLLECTIONSITE");
modelBuilder.Entity<CollectionSite>().Property(p => p.MsreplTranVersion).HasColumnName("msrepl_tran_version");
modelBuilder.Entity<CollectionSite>().Property(p => p.SiteID).HasColumnName("SITEID");
modelBuilder.Entity<CollectionSite>().Property(p => p.AmexId).HasColumnName("AMEX_ID");
modelBuilder.Entity<CollectionSite>().Property(p => p.MsreplTranVersion).HasColumnName("msrepl_tran_version");
modelBuilder.Entity<CollectionSite>().HasMany<ClinicAttributesAssignment>(x => x.ClinicAttributesAssignments).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteId);
modelBuilder.Entity<CollectionSite>().HasMany<AlereSite>(x => x.AlereSites).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteId);
modelBuilder.Entity<CollectionSite>().HasMany<AtnSite>(x => x.AtnSites).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasMany<ClientCollSite>(x => x.ClientCollSites).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasMany<CollectionSiteCarrier>(x => x.CollectionSiteCarriers).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteID);
//modelBuilder.Entity<CollectionSite>().HasOptional<CollectionSiteExtra>(x => x.CollectionSiteExtra).WithRequired(x => x.CollectionSite);
modelBuilder.Entity<CollectionSite>().HasMany<CollectionSiteMultiple>(x => x.CollectionSiteMultiples).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasOptional<CollectionSiteOption>(x => x.CollectionSiteOption).WithRequired(x => x.CollectionSite);
modelBuilder.Entity<CollectionSite>().HasMany<CollectionSitePanel>(x => x.CollectionSitePanels).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteId);
modelBuilder.Entity<CollectionSite>().HasMany<CrlSite>(x => x.CrlSites).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasMany<CsAddress>(x => x.CsAddresses).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasMany<ReimbursementHistory>(x => x.ReimbursementHistories).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteId);
modelBuilder.Entity<CollectionSite>().HasMany<SiteDynamicService>(x => x.SiteDynamicServices).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.SiteId);
modelBuilder.Entity<CollectionSite>().HasMany<SiteServicesAndPrice>(x => x.SiteServicesAndPrices).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
modelBuilder.Entity<CollectionSite>().HasMany<UserProfile>(x => x.UserProfiles).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
//modelBuilder.Entity<CollectionSite>().HasOptional<HoursOfOperation>(x => x.HoursOfOperation).WithRequired(x => x.CollectionSite);
modelBuilder.Entity<CollectionSite>().HasMany<CollectionSiteGroups>(x => x.CollectionSiteGroups).WithRequired(x => x.CollectionSite).HasForeignKey(x => x.Siteid);
CollectionSiteOption 的 DBContext：
public DbSet<CollectionSiteOption> CollectionSiteOptions { get; set; }
流利API...
//
modelBuilder.Entity<CollectionSiteOption>().HasKey(e => e.Siteid);
modelBuilder.Entity<CollectionSiteOption>().ToTable("COLLECTIONSITEOPTIONS", "dbo");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Siteid).HasColumnName("SITEID");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Attainbilltonum)
.HasColumnName("ATTAINBILLTONUM")
.HasMaxLength(15)
.IsUnicode(false);
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Averifycontract).HasColumnName("AVERIFYCONTRACT");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Backgroundscontract).HasColumnName("BACKGROUNDSCONTRACT");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.CliaExpirationDate).HasColumnType("datetime");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Connectiontype)
.HasColumnName("CONNECTIONTYPE")
.HasMaxLength(30)
.IsUnicode(false);
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Ispnumber)
.HasColumnName("ISPNUMBER")
.HasMaxLength(10)
.IsUnicode(false);
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.MsreplTranVersion).HasColumnName("msrepl_tran_version");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Password)
.HasColumnName("PASSWORD")
.HasMaxLength(10)
.IsUnicode(false);
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Posonlyreviewcontract).HasColumnName("POSONLYREVIEWCONTRACT");
modelBuilder.Entity<CollectionSiteOption>().Property(e => e.Userid)
.HasColumnName("USERID")
.HasMaxLength(30)
.IsUnicode(false);
modelBuilder.Entity<CollectionSiteOption>().Property(e => e._24hours).HasColumnName("24HOURS");
违规代码方法：
我在有问题的代码行前面加上 *---> 和 <---* 前缀。
private CollectionSite GetCollectionSiteInformation(int siteID)
{
CollectionSite collectionSite = new CollectionSite();
SendMessageToUser($"Retrieving the collection site for '{siteID}'.");
collectionSite = Context.CollectionSites.Where(o => o.SiteID == siteID).SingleOrDefault();
SendMessageToUser($"Retrieving the clinic attribute assignments & value assignments for '{siteID}'.");
collectionSite.ClinicAttributesAssignments = Context.ClinicAttributesAssignment.Where(x => x.SiteId == siteID).Include(x => x.ClinicAttributesValueAssignments).ToList();
SendMessageToUser($"Retrieving the Alere sites for '{siteID}'.");
collectionSite.AlereSites = Context.AlereSites.Where(x => x.SiteId == siteID).ToList();
SendMessageToUser($"Retrieving the Atn sites for '{siteID}'.");
collectionSite.AtnSites = Context.AtnSites.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the client collection sites for '{siteID}'.");
collectionSite.ClientCollSites = Context.ClientCollSites.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the collection site carrier for '{siteID}'.");
collectionSite.CollectionSiteCarriers = Context.CollectionSiteCarrier.Where(x => x.SiteID == siteID).ToList();
//SendMessageToUser($"Retrieving the collection site extras for '{siteID}'.");
//collectionSite.CollectionSiteExtra = Context.CollectionSiteExtras.Where(x => x.Siteid == siteID).SingleOrDefault();
SendMessageToUser($"Retrieving the collection site multiples for '{siteID}'.");
collectionSite.CollectionSiteMultiples = Context.CollectionSiteMultiples.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the collection site groups for '{siteID}'.");
collectionSite.CollectionSiteGroups = Context.CollectionSiteGroups.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the collection site options for '{siteID}'.");
*--->collectionSite.CollectionSiteOption = Context.CollectionSiteOptions.Where(x => x.Siteid == siteID).SingleOrDefault();<---*
SendMessageToUser($"Retrieving the collection site panels for '{siteID}'.");
collectionSite.CollectionSitePanels = Context.CollectionSitePanels.Where(x => x.SiteId == siteID).ToList();
SendMessageToUser($"Retrieving the CRL sites for '{siteID}'.");
collectionSite.CrlSites = Context.CrlSites.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the collection site addresses for '{siteID}'.");
collectionSite.CsAddresses = Context.CsAddresses.Where(x => x.Siteid == siteID).Include(x => x.Address).ToList();
SendMessageToUser($"Retrieving the reimbursement histories for '{siteID}'.");
collectionSite.ReimbursementHistories = Context.ReimbursementHistory.Where(x => x.SiteId == siteID).ToList();
SendMessageToUser($"Retrieving the site dynamic services for '{siteID}'.");
collectionSite.SiteDynamicServices = Context.SiteDynamicServices.Where(x => x.SiteId == siteID).ToList();
SendMessageToUser($"Retrieving the site services & prices for '{siteID}'.");
collectionSite.SiteServicesAndPrices = Context.SiteServicesAndPrices.Where(x => x.Siteid == siteID).ToList();
SendMessageToUser($"Retrieving the user profiles for '{siteID}'.");
collectionSite.UserProfiles = Context.UserProfiles.Where(x => x.Siteid == siteID).Include(x => x.Mach).ToList();
//SendMessageToUser($"Retrieving the hours of operation for '{siteID}'.");
//collectionSite.HoursOfOperation = Context.HoursOfOperation.Where(x => x.Siteid == siteID).SingleOrDefault();
return collectionSite;
}
堆栈跟踪：
at System.Data.Entity.Core.Objects.EntityEntry.WillNotRefSteal(EntityReference refToPrincipal, IEntityWrapper wrappedPrincipal)
at System.Data.Entity.Core.Objects.EntityEntry.FixupEntityReferenceToPrincipal(EntityReference relatedEnd, EntityKey foreignKey, Boolean setIsLoaded, Boolean replaceExistingRef)
at System.Data.Entity.Core.Objects.EntityEntry.FixupReferencesByForeignKeys(Boolean replaceAddedRefs, EntitySetBase restrictTo)
at System.Data.Entity.Core.Objects.ObjectStateManager.FixupReferencesByForeignKeys(EntityEntry newEntry, Boolean replaceAddedRefs)
at System.Data.Entity.Core.Objects.ObjectStateManager.AddEntry(IEntityWrapper wrappedObject, EntityKey passedKey, EntitySet entitySet, String argumentName, Boolean isAdded)
at System.Data.Entity.Core.Common.Internal.Materialization.Shaper.HandleEntityAppendOnly[TEntity](Func`2 constructEntityDelegate, EntityKey entityKey, EntitySet entitySet)
at System.Data.Entity.Core.Common.Internal.Materialization.Coordinator`1.ReadNextElement(Shaper shaper)
at System.Data.Entity.Core.Common.Internal.Materialization.Shaper`1.SimpleEnumerator.MoveNext()
at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
at DatabaseRefreshRecovery.Processess.Clinics.GetCollectionSiteInformation(Int32 siteID) in C:\development\escreen\DEV-TOOLS\DatabaseRefreshRecoveryTool\DatabaseRefreshRecovery\Processes\Clinics.cs:line 137
at DatabaseRefreshRecovery.Processess.Clinics.RetrieveUserData() in C:\development\escreen\DEV-TOOLS\DatabaseRefreshRecoveryTool\DatabaseRefreshRecovery\Processes\Clinics.cs:line 48
at DatabaseRefreshRecovery.DatabaseRefreshRecoveryForm.ProcessCollectionSites() in C:\development\escreen\DEV-TOOLS\DatabaseRefreshRecoveryTool\DatabaseRefreshRecovery\DatabaseRefreshRecoveryForm.cs:line 159
at DatabaseRefreshRecovery.DatabaseRefreshRecoveryForm.ProcessBackup() in C:\development\escreen\DEV-TOOLS\DatabaseRefreshRecoveryTool\DatabaseRefreshRecovery\DatabaseRefreshRecoveryForm.cs:line 88
通过添加 .Map() 定义外键解决了我的问题。认为外键需要在一对一关系上定义，但不知道如何定义，我通过 API 找到的一对一关系示例没有定义它。
modelBuilder.Entity<CollectionSite>().HasOptional<CollectionSiteOption>(x => x.CollectionSiteOption).WithRequired(x => x.CollectionSite).Map(x => x.MapKey("Siteid"));