Error: Collection was modified
Printed From: IdeaBlade
Category: DevForce
Forum Name: DevForce 2010
Forum Discription: For .NET 4.0
URL: http://www.ideablade.com/forum/forum_posts.asp?TID=3752
Printed Date: 07-Apr-2025 at 7:33pm
Topic: Error: Collection was modified
Posted By: erika
Subject: Error: Collection was modified
Date 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)
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Replies:
Posted By: sbelini
Date Posted: 31-Oct-2012 at 8:26pm
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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.
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