WCF服务问题与Poco实体 [英] Wcf Service Issue with poco entitiies

问题描述

您好，

在使用实体框架poco对象作为服务的返回类型时，我面临以下问题.我正在添加错误消息和问题的堆栈跟踪.

I am facing with the following issue while using Entity framework poco object as return type for a service. I am adding the error message and stack trace of the issue.

请问有人可以帮我解决这个问题吗?

Can any one plesase help me out in this issue?

尝试序列化参数时出错 http://tempuri.org/:GetProjectScheduleResult . InnerException消息是"Accuer.Relay.Models.ProjectTask类型的对象图"包含循环，如果禁用了引用跟踪，则无法序列化.请参阅InnerException了解更多信息 详细信息.

There was an error while trying to serialize parameter http://tempuri.org/:GetProjectScheduleResult. The InnerException message was 'Object graph for type 'Accuer.Relay.Models.ProjectTask' contains cycles and cannot be serialized if reference tracking is disabled.'.  Please see InnerException for more details.

System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameterPart(XmlDictionaryWriter writer，PartInfo部件，对象图)
System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameter(XmlDictionaryWriter writer，PartInfo部件，对象图)
System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeBody(XmlDictionaryWriter writer，MessageVersion版本，字符串操作，MessageDescription messageDescription，对象returnValue，Object []参数，布尔值isRequest)
System.ServiceModel.Dispatcher.OperationFormatter.SerializeBodyContents(XmlDictionaryWriter编写器，MessageVersion版本，Object []参数，Object returnValue，布尔值isRequest)
System.ServiceModel.Dispatcher.OperationFormatter.OperationFormatterMessage.OperationFormatterBodyWriter.OnWriteBodyContents(XmlDictionaryWriter writer)
System.ServiceModel.Channels.BodyWriter.WriteBodyContents(XmlDictionaryWriter writer)
System.ServiceModel.Channels.BodyWriterMessage.OnWriteBodyContents(XmlDictionaryWriter writer)
System.ServiceModel.Channels.Message.OnWriteMessage(XmlDictionaryWriter writer)
System.ServiceModel.Channels.Message.WriteMessage(XmlDictionaryWriter writer)
System.ServiceModel.Channels.BufferedMessageWriter.WriteMessage(消息，BufferManager BufferManager，Int32 initialOffset，Int32 maxSizeQuota)
System.ServiceModel.Channels.BinaryMessageEncoderFactory.BinaryMessageEncoder.WriteMessage(消息，Int32 maxMessageSize，BufferManager bufferManager，Int32 messageOffset)
System.ServiceModel.Channels.HttpOutput.SerializeBufferedMessage(消息消息)
System.ServiceModel.Channels.HttpOutput.Send(TimeSpan超时)
System.ServiceModel.Channels.HttpRequestContext.OnReply(消息消息，TimeSpan超时)
System.ServiceModel.Activation.HostedHttpContext.OnReply(消息消息，TimeSpan超时)
System.ServiceModel.Channels.RequestContextBase.Reply(消息消息，TimeSpan超时)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.Reply(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage9(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage8(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc)
System.ServiceModel.Dispatcher.MessageRpc.Process(布尔值isOperationContextSet)
System.ServiceModel.Dispatcher.ChannelHandler.DispatchAndReleasePump(RequestContext请求，布尔型cleanThread，OperationContext currentOperationContext)
System.ServiceModel.Dispatcher.ChannelHandler.HandleRequest(RequestContext请求，OperationContext currentOperationContext)
System.ServiceModel.Dispatcher.ChannelHandler.AsyncMessagePump(IAsyncResult结果)
System.ServiceModel.Dispatcher.ChannelHandler.OnAsyncReceiveComplete(IAsyncResult结果)
System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult结果)
System.Runtime.AsyncResult.Complete(布尔值已同步完成)
System.Runtime.InputQueue`1.AsyncQueueReader.Set(Item item)
System.Runtime.InputQueue`1.EnqueueAndDispatch(项目项，布尔值canDispatchOnThisThread)
System.Runtime.InputQueue`1.EnqueueAndDispatch(T项目，Action dequeuedCallback，布尔值canDispatchOnThisThread)
System.ServiceModel.Channels.SingletonChannelAcceptor`3.Enqueue(QueueItemType item，Action dequeuedCallback，Boolean canDispatchOnThisThread)
System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext上下文，操作回调)
System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult结果)
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.HandleRequest()
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.BeginRequest()
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequest(对象状态)
System.ServiceModel.AspNetPartialTrustHelpers.PartialTrustInvoke(ContextCallback回调，对象状态)
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequestWithFlow(对象状态)
System.Runtime.IOThreadScheduler.ScheduledOverlapped.IOCallback(UInt32错误代码，UInt32 numBytes，NativeOverlapped * nativeOverlapped)
System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32错误，UInt32字节读取，NativeOverlapped * nativeOverlapped)
System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode，UInt32 numBytes，NativeOverlapped * pOVERLAP)

System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameterPart(XmlDictionaryWriter writer, PartInfo part, Object graph)
System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameter(XmlDictionaryWriter writer, PartInfo part, Object graph)
System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeBody(XmlDictionaryWriter writer, MessageVersion version, String action, MessageDescription messageDescription, Object returnValue, Object[] parameters, Boolean isRequest)
System.ServiceModel.Dispatcher.OperationFormatter.SerializeBodyContents(XmlDictionaryWriter writer, MessageVersion version, Object[] parameters, Object returnValue, Boolean isRequest)
System.ServiceModel.Dispatcher.OperationFormatter.OperationFormatterMessage.OperationFormatterBodyWriter.OnWriteBodyContents(XmlDictionaryWriter writer)
System.ServiceModel.Channels.BodyWriter.WriteBodyContents(XmlDictionaryWriter writer)
System.ServiceModel.Channels.BodyWriterMessage.OnWriteBodyContents(XmlDictionaryWriter writer)
System.ServiceModel.Channels.Message.OnWriteMessage(XmlDictionaryWriter writer)
System.ServiceModel.Channels.Message.WriteMessage(XmlDictionaryWriter writer)
System.ServiceModel.Channels.BufferedMessageWriter.WriteMessage(Message message, BufferManager bufferManager, Int32 initialOffset, Int32 maxSizeQuota)
System.ServiceModel.Channels.BinaryMessageEncoderFactory.BinaryMessageEncoder.WriteMessage(Message message, Int32 maxMessageSize, BufferManager bufferManager, Int32 messageOffset)
System.ServiceModel.Channels.HttpOutput.SerializeBufferedMessage(Message message)
System.ServiceModel.Channels.HttpOutput.Send(TimeSpan timeout)
System.ServiceModel.Channels.HttpRequestContext.OnReply(Message message, TimeSpan timeout)
System.ServiceModel.Activation.HostedHttpContext.OnReply(Message message, TimeSpan timeout)
System.ServiceModel.Channels.RequestContextBase.Reply(Message message, TimeSpan timeout)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.Reply(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage9(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage8(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc)
System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)
System.ServiceModel.Dispatcher.ChannelHandler.DispatchAndReleasePump(RequestContext request, Boolean cleanThread, OperationContext currentOperationContext)
System.ServiceModel.Dispatcher.ChannelHandler.HandleRequest(RequestContext request, OperationContext currentOperationContext)
System.ServiceModel.Dispatcher.ChannelHandler.AsyncMessagePump(IAsyncResult result)
System.ServiceModel.Dispatcher.ChannelHandler.OnAsyncReceiveComplete(IAsyncResult result)
System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
System.Runtime.InputQueue`1.AsyncQueueReader.Set(Item item)
System.Runtime.InputQueue`1.EnqueueAndDispatch(Item item, Boolean canDispatchOnThisThread)
System.Runtime.InputQueue`1.EnqueueAndDispatch(T item, Action dequeuedCallback, Boolean canDispatchOnThisThread)
System.ServiceModel.Channels.SingletonChannelAcceptor`3.Enqueue(QueueItemType item, Action dequeuedCallback, Boolean canDispatchOnThisThread)
System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext context, Action callback)
System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult result)
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.HandleRequest()
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.BeginRequest()
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequest(Object state)
System.ServiceModel.AspNetPartialTrustHelpers.PartialTrustInvoke(ContextCallback callback, Object state)
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequestWithFlow(Object state)
System.Runtime.IOThreadScheduler.ScheduledOverlapped.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)

推荐答案

你好，

您的POCO实体很可能包含到相关实体的导航属性，而那些实体则包含回到您的原始实体的导航属性.使用默认序列化，它将创建周期.有几种可能的方法来避免这种情况 例外.最常见的是:

your POCO entity most probably contains navigation properties to related entities and those entities contain navigation property back to your original entity. With default serialization it creates cycles. There are several possibilities how to avoid this exception. Most common are:

• 使用标记所有实体 DataContractAttribute 和 DataMemberAttribute 属性.在DataContract属性中设置IsReference = true
• 不发送实体-而是使用数据传输对象
• 使用 用于实体序列化的DataContractSurrogate
• 确保您的实体不包含循环.这意味着，如果一个实体具有到另一个实体的导航属性，则另一个实体一定不能具有回到第一个实体的导航属性.

• Mark all your entities with DataContractAttribute and DataMemberAttribute attributes. In DataContract attribute set IsReference=true
• Don't send entities - use data transfer objects instead
• Mark back referencing navigation properties with IgnoreDataMemberAttribute
• Use DataContractSurrogate for entity serialization
• Ensure that your entities do not contain cycles. It means that if one entity has navigation property to other entity, the other entity mustn't have the navigation property back to first entity.

最诚挚的问候，
拉迪斯拉夫

Best regards,
Ladislav

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