Hi, i am consuming wcf service that returns list of entities. It throws the following exception. OS: Windows XP sp3 , .net 4.0

Any help ?

System.ServiceModel.Dispatcher.NetDispatcherFaultException: The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://tempuri.org/:GetServicesResult. The InnerException message was 'Element GetServicesResult from namespace http://tempuri.org/ cannot have child contents to be deserialized as an object. Please use XmlNode[] to deserialize this pattern of XML.'.  Please see InnerException for more details. ---> System.Runtime.Serialization.SerializationException: Element GetServicesResult from namespace http://tempuri.org/ cannot have child contents to be deserialized as an object. Please use XmlNode[] to deserialize this pattern of XML. ---> System.Xml.XmlException: End element 'GetServicesResult' from namespace 'http://tempuri.org/' expected. Found element 'b:ServiceEntity' from namespace 'http://schemas.datacontract.org/2004/07/BabilonIssueTracker.Data.EntityClasses'.
   at System.Xml.XmlExceptionHelper.ThrowXmlException(XmlDictionaryReader reader, String res, String arg1, String arg2, String arg3)
   at System.Xml.XmlExceptionHelper.ThrowEndElementExpected(XmlDictionaryReader reader, String localName, String ns)
   at System.Xml.XmlBaseReader.ReadEndElement()
   at System.Runtime.Serialization.ObjectDataContract.ReadXmlValue(XmlReaderDelegator reader, XmlObjectSerializerReadContext context)
   --- End of inner exception stack trace ---
   at System.Runtime.Serialization.ObjectDataContract.ReadXmlValue(XmlReaderDelegator reader, 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.XmlObjectSerializerReadContext.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 System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameterPart(XmlDictionaryReader reader, PartInfo part, Boolean isRequest)
   --- End of inner exception stack trace ---

Server stack trace: 
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameterPart(XmlDictionaryReader reader, PartInfo part, Boolean isRequest)
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameter(XmlDictionaryReader reader, PartInfo part, Boolean isRequest)
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeBody(XmlDictionaryReader reader, MessageVersion version, String action, MessageDescription messageDescription, Object[] parameters, Boolean isRequest)
   at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeBodyContents(Message message, Object[] parameters, Boolean isRequest)
   at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeReply(Message message, Object[] parameters)
   at System.ServiceModel.Dispatcher.ProxyOperationRuntime.AfterReply(ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at BabilonIssueTracker.Interfaces.IDataService.GetServices()
   at BabilonIssueTracker.UI.CacheManager.GetAllServices()
   at BabilonIssueTracker.UI.Program.PreloadLocalCache()
   at BabilonIssueTracker.UI.Program.<Main>b__0(Object state)
   at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()

What's the signature of the service method?

Walaa wrote:

What's the signature of the service method?

Hi, method is as below:

[OperationContract]
 IQueryable<ServiceEntity> GetServices();

It is strange, it works OK on some computers, on some it fails with the same exception. On my dev machine(win7 x64) client and server works fine. On client deployments it fails.

Changing IQueryable to List<T> solves the problem, but it is strange that it works on dev. machines.

Also try to use the interface IEntity or IEntity2 instead of the Entity type.