如何从 WCF 服务返回大而复杂的对象？答案

【问题标题】：How to returnlarge and complex objects from a WCF Serice?如何从 WCF 服务返回大而复杂的对象？
【发布时间】：2009-03-24 14:53:06
【问题描述】：

我认为在尝试返回复杂对象（具有嵌套对象的对象和嵌套对象的对象......）时，我遇到了序列化或大小调整问题。

我得到一个 CommunicationException 的错误代码。有什么想法吗？

编辑：这是堆栈跟踪

A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in mscorlib.dll
System.ServiceModel.CommunicationException: Connessione sottostante chiusa: Chiusura imprevista della connessione.. ---> System.Net.WebException: Connessione sottostante chiusa: Chiusura imprevista della connessione..
   in System.Net.HttpWebRequest.GetResponse()
   in System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   --- Fine dell'analisi dello stack dell'eccezione interna ---

Server stack trace: 
   in System.ServiceModel.Channels.HttpChannelUtilities.ProcessGetResponseWebException(WebException webException, HttpWebRequest request, HttpAbortReason abortReason)
   in System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   in System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
   in System.ServiceModel.Channels.ClientReliableChannelBinder`1.RequestClientReliableChannelBinder`1.OnRequest(TRequestChannel channel, Message message, TimeSpan timeout, MaskingMode maskingMode)
   in System.ServiceModel.Channels.ClientReliableChannelBinder`1.Request(Message message, TimeSpan timeout, MaskingMode maskingMode)
   in System.ServiceModel.Channels.ClientReliableChannelBinder`1.Request(Message message, TimeSpan timeout)
   in System.ServiceModel.Security.SecuritySessionClientSettings`1.SecurityRequestSessionChannel.Request(Message message, TimeSpan timeout)
   in System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
   in System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   in System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)
   in System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   in System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
   in System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   in System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   in RecuperoPagati.DataCoreReference.IDataCoreService.GetDossierByNumDossier(String Env, String NumDossier)
   in RecuperoPagati.DataCoreReference.DataCoreServiceClient.GetDossierByNumDossier(String Env, String NumDossier) in C:\Documents and Settings\gdipietro\Documenti\Dev\Rifatturazione\RecuperoPagati\RecuperoPagati\RecuperoPagati\Service References\DataCoreReference\Reference.vb:riga 198
   in RecuperoPagati.WebUserControl1.Page_Load(Object sender, EventArgs e) in C:\Documents and Settings\gdipietro\Documenti\Dev\Rifatturazione\RecuperoPagati\RecuperoPagati\RecuperoPagati\WebUserControl1.ascx.vb:riga 8

【问题讨论】：

标签： asp.net wcf

【解决方案1】：

我同意约翰的观点；这可能不是类型复杂性问题。要找出真正的罪魁祸首，您可以尝试将诊断日志记录添加到您的服务配置中。 WCF 的跟踪和日志记录功能非常强大，可以帮助您找到大多数问题的根本原因。

如果您运行的是 VS2008，当您右键单击服务宿主项目的配置文件时，您应该会看到“编辑 WCF 配置”的菜单选项。选择“诊断”节点以启用跟踪和消息记录。

http://msdn.microsoft.com/en-us/library/ms730064.aspx

可以在服务跟踪查看器工具中非常有效地查看此日志的输出，该工具应该已经在您的机器上（框架随附）。

http://msdn.microsoft.com/en-us/library/ms732023.aspx

【讨论】：

【解决方案2】：

问题可能与类型的复杂性无关。请发布完整的异常，以及所有 InnerException。只需捕获异常并发布 ex.ToString()。

【讨论】：