Print Page | Close Window

Failed on 2nd call to SaveChanges()

Printed From: IdeaBlade
Category: DevForce
Forum Name: DevForce 2009
Forum Discription: For .NET 3.5
URL: http://www.ideablade.com/forum/forum_posts.asp?TID=1315
Printed Date: 22-Sep-2025 at 6:06am


Topic: Failed on 2nd call to SaveChanges()
Posted By: dkearney1
Subject: Failed on 2nd call to SaveChanges()
Date Posted: 09-Jun-2009 at 4:22pm
Scenario:
 
With a newly instansiated and logged-in EntityManager
  • Retrieve an Entity from the database
  • Modify a property
  • call em.SaveChanges()
    • I have derived from the IdeaBlade supplied EntityManager and hooked up an em_Saving event handler that sets the values of the housekeeping properties "Creator", "CreateDate", "LastUpdater", "LastUpdate".
  • Save operation completes normally
  • Verify that housekeeping values in database match those set in Saving event handler
  • Using the same EntityManager instance and same Entity instance
  • Modify the property again
  • call em.SaveChanges()
    • Verify that the Saving event hander updates the housekeeping properties appropriately
  • Exception is encountered.

I speak specifically of the housekeeping properties because dates are of type DateTimeOffset, and that datatype is referenced in the exception as "WriteDateTimeOffsetToXml".

Obviously, I need help avoiding the exception.
 
Thanks,
Dan
 
Text of the exception:

A first chance exception of type 'System.InvalidCastException' occurred in Unknown Module.

A first chance exception of type 'System.InvalidCastException' occurred in mscorlib.dll

A first chance exception of type 'System.InvalidCastException' occurred in IdeaBlade.EntityModel.dll

A first chance exception of type 'IdeaBlade.EntityModel.EntityManagerSaveException' occurred in IdeaBlade.EntityModel.dll

A first chance exception of type 'IdeaBlade.EntityModel.EntityManagerSaveException' occurred in IdeaBlade.EntityModel.dll

IdeaBlade.EntityModel.EntityManagerSaveException: Specified cast is not valid. ---> System.InvalidCastException: Specified cast is not valid.

Server stack trace:

at WriteDateTimeOffsetToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )

at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeAndVerifyType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, Boolean verifyKnownType, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithXsiType(XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle objectTypeHandle, Type objectType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle, Type declaredType)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at WriteArrayOfanyTypeToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , CollectionDataContract )

at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerializeReference(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at WriteEntitySurrogateToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )

at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at WriteArrayOfEntitySurrogateToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , CollectionDataContract )

at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerializeReference(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at WriteArrayOfEntitySurrogateToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )

at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerializeReference(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at WriteEntityGroupSurrogateToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )

at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at WriteArrayOfEntityGroupSurrogateToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , CollectionDataContract )

at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerializeReference(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at WriteArrayOfEntityGroupSurrogateToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )

at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContextComplex.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerializeReference(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at WriteEntityCacheToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )

at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.NetDataContractSerializer.InternalWriteObjectContent(XmlWriterDelegator writer, Object graph, DataContract contract, Hashtable surrogateDataContracts)

at System.Runtime.Serialization.NetDataContractSerializer.InternalWriteObject(XmlWriterDelegator writer, Object graph)

at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph)

at System.Runtime.Serialization.XmlObjectSerializer.WriteObject(XmlDictionaryWriter writer, Object graph)

at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameterPart(XmlDictionaryWriter writer, PartInfo part, Object graph)

at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameter(XmlDictionaryWriter writer, PartInfo part, Object graph)

at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameters(XmlDictionaryWriter writer, PartInfo[] parts, Object[] parameters)

at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeBody(XmlDictionaryWriter writer, MessageVersion version, String action, MessageDescription messageDescription, Object returnValue, Object[] parameters, Boolean isRequest)

at System.ServiceModel.Dispatcher.OperationFormatter.SerializeBodyContents(XmlDictionaryWriter writer, MessageVersion version, Object[] parameters, Object returnValue, Boolean isRequest)

at System.ServiceModel.Dispatcher.OperationFormatter.OperationFormatterMessage.OperationFormatterBodyWriter.OnWriteBodyContents(XmlDictionaryWriter writer)

at System.ServiceModel.Channels.BodyWriter.WriteBodyContents(XmlDictionaryWriter writer)

at System.ServiceModel.Channels.BodyWriterMessage.OnWriteBodyContents(XmlDictionaryWriter writer)

at System.ServiceModel.Channels.Message.OnWriteMessage(XmlDictionaryWriter writer)

at System.ServiceModel.Channels.Message.WriteMessage(XmlDictionaryWriter writer)

at System.ServiceModel.Channels.BufferedMessageWriter.WriteMessage(Message message, BufferManager bufferManager, Int32 initialOffset, Int32 maxSizeQuota)

at System.ServiceModel.Channels.BinaryMessageEncoderFactory.BinaryMessageEncoder.WriteMessage(Message message, Int32 maxMessageSize, BufferManager bufferManager, Int32 messageOffset)

at IdeaBlade.Core.Wcf.Extensions.GZipMessageEncoderFactory.GZipMessageEncoder.WriteMessage(Message message, Int32 maxMessageSize, BufferManager bufferManager, Int32 messageOffset)

at System.ServiceModel.Channels.HttpOutput.SerializeBufferedMessage(Message message)

at System.ServiceModel.Channels.HttpOutput.Send(TimeSpan timeout)

at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.SendRequest(Message message, TimeSpan timeout)

at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)

at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)

at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)

at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)

at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)

at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:

at IdeaBlade.EntityModel.RemoteEntityServerProxy.CheckConnection(Exception pException)

at IdeaBlade.EntityModel.EntityServerProxy.SaveChanges(SessionBundle sessionBundle, EntityCache entityCache, SaveOptions saveOptions)

at IdeaBlade.EntityModel.EntityManager.SaveEntitiesCore(SaveWorkState workstate)

--- End of inner exception stack trace ---

at IdeaBlade.EntityModel.EntityManager.HandleSaveResultException(SaveWorkState saveWorkState, SaveOptions saveOptions, Boolean isAsyncOp)

at IdeaBlade.EntityModel.EntityManager.SaveChangesCore(IEnumerable entities, SaveOptions saveOptions)

at IdeaBlade.EntityModel.EntityManager.SaveChanges(IEnumerable entities, SaveOptions saveOptions)

at IdeaBlade.EntityModel.EntityManager.SaveChanges()

at EntityQuery_Tester.Program.Test1(DomainModelEntityManager em) in C:\Documents and Settings\Dan\My Documents\~Dev\BOTS\Test Projects\EntityQuery Tester\Program.cs:line 174



-------------
Dan
“In anything at all, perfection is finally attained not when there is no
longer anything to add, but when there is no longer anything to take away.”
Saint-Exupéry
Wind, Sand, and Stars


Replies:
Posted By: kimj
Date Posted: 10-Jun-2009 at 12:09pm
First, the good news.  This problem does not occur in current bits, which will be released in version 5.1.1 next week.
 
The problem in prior versions is two-fold. 
 - As you know, DevForce entities have an EntityState, and also an EntityVersion, similar to a DataRow; so there are current value, original value and proposed value arrays used internally for change tracking.  So, the first part of the problem is that prior to v5.1.1 we were incorrectly allowing the original values to be set while the Entity was undergoing serialization.  These values were being passed back to the application from the server after the Save and shouldn't have been.
 
- Now the interesting part - apparently because this was happening within the context of serialization, the DateTimeOffset values were actually created as DateTimeOffsetAdapter types.  Once an entity was saved, it would have these odd datatypes stored in its original values, and a cast exception would then occur when this data was accessed, as it is when the SaveChanges() processing occurs.  What is a DateTimeOffsetAdapter you might wonder?  It's an internal type used by Microsoft buried within System.Runtime.Serialization and how or why it's being pushed into our properties is a mystery.
 
In the new version due next week, we've fixed the issue with the unnecessary creation of this data during serialization, and a side effect of that is your problem also goes away. 
 
If you need a workaround until you upgrade you can do the following: after the SaveChanges completes, call SetModified() immediately followed by AcceptChanges() on all affected entities.  This combination ensures that version arrays containing the DateTimeOffsetAdapter are cleared.
 
 

Posted By: dkearney1
Date Posted: 10-Jun-2009 at 12:33pm
Thanks for the quick turnaround. I'll try the workaround you mentioned, and look forward to the release of the 5.1.1 bits.

-------------
Dan
“In anything at all, perfection is finally attained not when there is no
longer anything to add, but when there is no longer anything to take away.”
Saint-Exupéry
Wind, Sand, and Stars

Posted By: dkearney1
Date Posted: 18-Jun-2009 at 6:06am
Do you still anticipate getting the 5.1.1 bits out this week?

-------------
Dan
“In anything at all, perfection is finally attained not when there is no
longer anything to add, but when there is no longer anything to take away.”
Saint-Exupéry
Wind, Sand, and Stars

Posted By: kimj
Date Posted: 18-Jun-2009 at 10:58am
RC3 (v5.1.1) is available for download now.  The home page still says RC2, because the release won't be "official" until later this afternoon, but what you download is RC3.

Posted By: dkearney1
Date Posted: 18-Jun-2009 at 11:10am
Great! Many thanks.

-------------
Dan
“In anything at all, perfection is finally attained not when there is no
longer anything to add, but when there is no longer anything to take away.”
Saint-Exupéry
Wind, Sand, and Stars


Print Page | Close Window