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我有,有時有自我參照實體自我引用的表,如下所示: (是的,IdFamily爲空)實體框架和自我引用表和自我參照實體
...
//At my Business
newFile.Family = newFile;
...
//At my ASP.NET MVC action I call:
context.SaveChanges();
它拋出一個DbUpdateException:
[UpdateException: Unable to determine a valid ordering for dependent operations. Dependencies may exist due to foreign key constraints, model requirements, or store-generated values.]
System.Data.Mapping.Update.Internal.UpdateTranslator.DependencyOrderingError(IEnumerable`1 remainder) +4302030
System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) +4300384
System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options) +583
System.Data.Entity.Internal.InternalContext.SaveChanges() +382
[DbUpdateException: Unable to determine a valid ordering for dependent operations. Dependencies may exist due to foreign key constraints, model requirements, or store-generated values.]
System.Data.Entity.Internal.InternalContext.SaveChanges() +485
System.Data.Entity.Internal.LazyInternalContext.SaveChanges() +63
System.Data.Entity.DbContext.SaveChanges() +75
解決辦法是醜陋的,因爲我需要調用的SaveChanges,設置ID並再次調用的SaveChanges。打破UnitOfWork,以解決方法我需要把我所有的請求都放入TransactionScope中。
...
//At my Business
//newFile.Family = newFile;
context.SaveChanges();//BREAK UNIT OF WORK
newFile.IdFamily = newFile.Id;
...
//At my ASP.NET MVC action I call(Action Wrapped in TransactionScope):
context.SaveChanges();
很遺憾聽到它,但感謝澄清。我無法找到任何有關它的信息,只是自引用不同的實體表。我很樂意爲EF做出貢獻,我也計劃實施DbContext.IsDirty,我只是不知道我是否具備這些技能,EF代碼庫是巨大的。 – 2013-02-25 18:42:31