我想在我的控制檯應用程序中實現一些適當的NHibernate會話管理,但遇到一些非常奇怪的問題。有一刻,一切似乎都能正常工作,但隨機地,突然間它開始拋出一個「指定的轉換無效」異常,當試圖獲取一個特定的對象時,它似乎指向一個日期時間值,但沒有更多的信息是提供。stumped:自定義NHibernate會話管理給出「指定的強制轉換無效」異常(C#)
現在,我已經消除了任何與我的映射有關的錯誤,因爲我只是取消了除字符串字段和主鍵(這是一個GUID)之外的所有字段。儘管如此,這個例外仍然存在。此外,有問題的對象不包含任何子對象。
相反,我懷疑我如何調用我的Session,所以Session的緩存中存在一些導致此問題出於某種模糊原因的問題。
我使用的Util類來管理會議:
public static class FcoNHibernateUtil
{
private static readonly ISessionFactory sessionFactory = BuildSessionFactory();
private static ISessionFactory BuildSessionFactory()
{
try
{
// Create the SessionFactory from hibernate.cfg.xml
return new Configuration()
.Configure()
.AddAssembly("FcoPersistence")
.AddAssembly("FcoLib")
.AddAssembly("FargoLib")
.BuildSessionFactory();
}
catch (Exception ex)
{
throw ex;
}
}
public static ISessionFactory GetSessionFactory()
{
return sessionFactory;
}
public static ISession GetCurrentSession()
{
if (!CurrentSessionContext.HasBind(GetSessionFactory()))
CurrentSessionContext.Bind(GetSessionFactory().OpenSession());
return GetSessionFactory().GetCurrentSession();
}
public static void DisposeCurrentSession()
{
ISession currentSession = CurrentSessionContext.Unbind(GetSessionFactory());
if (currentSession != null)
{
currentSession.Close();
currentSession.Dispose();
}
}
}
所以我DataObjectManager類的每一個操作的開始,我從取像這樣的會議從超類繼承的常用方法獲取會話:
public ISession GetSession()
{
return FcoNHibernateUtil.GetCurrentSession();
}
當控制檯應用程序(或單元測試)的一次掃描所有操作完成,我確保DisposeCurrentSession-方法被調用。
有什麼可以改進的,可以防止這些異常來?
EDIT
這是堆棧跟蹤:
at NHibernate.Type.DateTimeType.IsEqual(Object x, Object y) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Type\DateTimeType.cs:line 93
at NHibernate.Type.NullableType.IsEqual(Object x, Object y, EntityMode entityMode) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Type\NullableType.cs:line 368
at NHibernate.Type.AbstractType.IsSame(Object x, Object y, EntityMode entityMode) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Type\AbstractType.cs:line 218
at NHibernate.Type.AbstractType.IsDirty(Object old, Object current, ISessionImplementor session) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Type\AbstractType.cs:line 110
at NHibernate.Type.NullableType.IsDirty(Object old, Object current, Boolean[] checkable, ISessionImplementor session) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Type\NullableType.cs:line 338
at NHibernate.Type.TypeHelper.FindDirty(StandardProperty[] properties, Object[] currentState, Object[] previousState, Boolean[][] includeColumns, Boolean anyUninitializedProperties, ISessionImplementor session) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Type\TypeHelper.cs:line 227
at NHibernate.Persister.Entity.AbstractEntityPersister.FindDirty(Object[] currentState, Object[] previousState, Object entity, ISessionImplementor session) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Persister\Entity\AbstractEntityPersister.cs:line 3555
at NHibernate.Event.Default.DefaultFlushEntityEventListener.DirtyCheck(FlushEntityEvent event) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Event\Default\DefaultFlushEntityEventListener.cs:line 456
at NHibernate.Event.Default.DefaultFlushEntityEventListener.IsUpdateNecessary(FlushEntityEvent event, Boolean mightBeDirty) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Event\Default\DefaultFlushEntityEventListener.cs:line 187
at NHibernate.Event.Default.DefaultFlushEntityEventListener.OnFlushEntity(FlushEntityEvent event) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Event\Default\DefaultFlushEntityEventListener.cs:line 43
at NHibernate.Event.Default.AbstractFlushingEventListener.FlushEntities(FlushEvent event) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Event\Default\AbstractFlushingEventListener.cs:line 161
at NHibernate.Event.Default.AbstractFlushingEventListener.FlushEverythingToExecutions(FlushEvent event) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Event\Default\AbstractFlushingEventListener.cs:line 60
at NHibernate.Event.Default.DefaultAutoFlushEventListener.OnAutoFlush(AutoFlushEvent event) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Event\Default\DefaultAutoFlushEventListener.cs:line 30
at NHibernate.Impl.SessionImpl.AutoFlushIfRequired(ISet`1 querySpaces) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Impl\SessionImpl.cs:line 1145
at NHibernate.Impl.SessionImpl.List(CriteriaImpl criteria, IList results) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Impl\SessionImpl.cs:line 1903
at NHibernate.Impl.CriteriaImpl.List(IList results) in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Impl\CriteriaImpl.cs:line 265
at NHibernate.Impl.CriteriaImpl.List[T]() in d:\CSharp\NH\NH\nhibernate\src\NHibernate\Impl\CriteriaImpl.cs:line 276
at FcoPersistence.GlobalLoginSettingsManager.GetGlobalLoginSettings(String ownIdent) in C:\Users\steemfe1\Documents\Work\Code\Epimetheus\branches\Refactoring\FcoPersistence\GlobalLoginSettingsManager.cs:line 189
,並且該方法在那裏發生:
public GlobalLoginSettings GetGlobalLoginSettings(string ownIdent)
{
session = GetSession();//if(session == null) session = Factory.OpenSession();
ITransaction tx = session.BeginTransaction();
GlobalLoginSettings owner;
try
{
ICriteria criteria = session.CreateCriteria(typeof (GlobalLoginSettings));
criteria.Add(Restrictions.Eq("OWNIdent", ownIdent));
var owners = criteria.List<GlobalLoginSettings>(); //<--- exception thrown
tx.Commit();
owner = owners.Count > 0 ? owners[0] : null;
}
catch (Exception e)
{
tx.Rollback();
throw e;
}
return owner;
}
EDIT2:
我得到一個線索,那就是當會話在獲取對象時自動刷新時發生這種情況。所以它看起來像是從早期事務處理的會話中發生的錯誤,但還沒有被刷新。所以這個問題潛伏在會話中,直到它再次被使用。
請顯示例外的全文 - 這將告訴我們它正在嘗試投射什麼。 –