DevForce Community Forum : Error: Collection was modified http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce 2010 : Error: Collection was modified Mon, 13 Apr 2026 01:12:18 -700 Wed, 31 Oct 2012 20:26:44 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=3752 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Error: Collection was modified : Hi erika,I've seen this... http://www.ideablade.com/forum/forum_posts.asp?TID=3752&PID=15031#15031 Author: sbelini
Subject: 3752
Posted: 31-Oct-2012 at 8:26pm

Hi erika,
I've seen this error when modifying an IEnumerable during iteration.
If that's the case, try adding the elements to a List for instance.
 
If not, please provide the snippet where the exception occurs.
 
sbelini.
]]> Wed, 31 Oct 2012 20:26:44 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3752&PID=15031#15031 Error: Collection was modified : HiI'm not sure what cause... http://www.ideablade.com/forum/forum_posts.asp?TID=3752&PID=15030#15030 Author: erika
Subject: 3752
Posted: 31-Oct-2012 at 7:47pm

Hi

I'm not sure what cause the following error. It could suddenly pop up when interacting with my application. Can anyone give hint on what could've caused the issue ? Thanks.

EntityServerException: Collection was modified; enumeration operation may not execute. ---> System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
   at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Enumerator.MoveNext()
   at System.Linq.Enumerable.<SelectManyIterator>d__14`2.MoveNext()
   at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
   at IdeaBlade.Core.TypeWrapper.GetTypeUsingMap()
   at IdeaBlade.Core.TypeWrapper.FindType()
   at IdeaBlade.Core.TypeWrapper.Restore()
   at IdeaBlade.Core.TypeWrapper.get_Type()
   at ReadMethodCallExpressionBlockFromXml(XmlReaderDelegator , XmlObjectSerializerReadContext , XmlDictionaryString[] , XmlDictionaryString[] )
   at System.Runtime.Serialization.ClassDataContract.ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context)
   at System.Runtime.Serialization.XmlObjectSerializerReadContext.ReadDataContractValue(DataContract dataContract, XmlReaderDelegator reader)
   at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator reader, String name, String ns, Type declaredType, DataContract& dataContract)
   at System.Runtime.Serialization.XmlObjectSerializerReadContextComplex.InternalDeserialize(XmlReaderDelegator xmlReader, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle, String name, String ns)
   at ReadSerializedExpressionFromXml(XmlReaderDelegator , XmlObjectSerializerReadContext , XmlDictionaryString[] , XmlDictionaryString[] )
   at System.Runtime.Serialization.ClassDataContract.ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context)
   at System.Runtime.Serialization.XmlObjectSerializerReadContext.ReadDataContractValue(DataContract dataContract, XmlReaderDelegator reader)
   at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator reader, String name, String ns, Type declaredType, DataContract& dataContract)
   at System.Runtime.Serialization.XmlObjectSerializerReadContextComplex.InternalDeserialize(XmlReaderDelegator xmlReader, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle, String name, String ns)
   at ReadEntityQuerySurrogateFromXml(XmlReaderDelegator , XmlObjectSerializerReadContext , XmlDictionaryString[] , XmlDictionaryString[] )
   at System.Runtime.Serialization.ClassDataContract.ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context)
   at System.Runtime.Serialization.XmlObjectSerializerReadContext.ReadDataContractValue(DataContract dataContract, XmlReaderDelegator reader)
   at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator reader, String name, String ns, Type declaredType, DataContract& dataContract)
   at System.Runtime.Serialization.XmlObjectSerializerReadContextComplex.InternalDeserialize(XmlReaderDelegator xmlReader, Type declaredType, DataContract dataContract, String name, String ns)
   at System.Runtime.Serialization.DataContractSerializer.InternalReadObject(XmlReaderDelegator xmlReader, Boolean verifyObjectName, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.XmlObjectSerializer.ReadObjectHandleExceptions(XmlReaderDelegator reader, Boolean verifyObjectName, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.DataContractSerializer.ReadObject(XmlDictionaryReader reader, Boolean verifyObjectName)
   at IdeaBlade.Core.Wcf.Extensions.CustomDataContractSerializer.ReadObject(XmlDictionaryReader reader, Boolean verifyObjectName)
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameterPart(XmlDictionaryReader reader, PartInfo part, Boolean isRequest)
   at IdeaBlade.EntityModel.CoroutineOperation.HandleError(INotifyCompletedArgs notifyCompletedArgs)
   at IdeaBlade.EntityModel.CoroutineOperation.OnCompleted(INotifyCompletedArgs notifyCompletedArgs)
   at IdeaBlade.EntityModel.CoroutineParallelProcessor.CompletionItem.HandleCompleted(INotifyCompletedArgs args)
   at IdeaBlade.EntityModel.BaseOperation.NotifyCompletedDelegate.Invoke(INotifyCompletedArgs args)
   at IdeaBlade.EntityModel.BaseOperation.BaseOnCompleted()
   at IdeaBlade.EntityModel.BaseOperation`2.OnCompleted()
   at IdeaBlade.EntityModel.BaseOperation`2.IdeaBlade.EntityModel.IHasAsyncEventArgs.OnCompleted()
   at IdeaBlade.EntityModel.AsyncProcessor`1.<>c__DisplayClass2.<.ctor>b__0(TArgs args)
   at IdeaBlade.EntityModel.AsyncProcessor`1.Signal()
   at IdeaBlade.EntityModel.AsyncProcessor`1.<Execute>b__5(Object x)
]]> Wed, 31 Oct 2012 19:47:37 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3752&PID=15030#15030