Question

根据要求 - 这是我从SVCTraceViewer.exe获取的跟踪

<E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent"><System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system"> <EventID>524340</EventID> <Type>3</Type><SubType Name="Error">0</SubType><Level>2</Level> <TimeCreated SystemTime="2013-11-26T01:35:30.8037467Z" /> <Source Name="System.ServiceModel" /><Correlation ActivityID="{6a4de494-31a3-49ab-935f-419911742e44}" /> <Execution ProcessName="WebDev.WebServer40" ProcessID="13564" ThreadID="13" /><Channel /><Computer>CONNOR-PC</Computer></System> <ApplicationData><TraceData><DataItem><TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Error"> <TraceIdentifier>http://msdn.microsoft.com/en-GB/library/System.ServiceModel.ServiceOperationExceptionOnReply.aspx</TraceIdentifier> <Description>Replying to an operation threw a exception.</Description><AppDomain>caf40de1-1-130299029702291231</AppDomain> <Source>System.ServiceModel.Dispatcher.ImmutableDispatchRuntime/11419366</Source><Exception> <ExceptionType>System.ObjectDisposedException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType> <Message>The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.</Message> <StackTrace> at System.Data.Objects.ObjectContext.EnsureConnection() at System.Data.Objects.ObjectQuery 1.GetResults（Nullable 1 forMergeOption) at System.Data.Objects.ObjectQuery 1.Execute（MergeOption mergeOption）在System.Data.Objects.DataClasses.EntityCollection 1.Load(List 1集合，MergeOption mergeOption）在System.Data.Objects.DataClasses.EntityCollection 1.Load(MergeOption mergeOption) at System.Data.Objects.DataClasses.RelatedEnd.Load() at System.Data.Objects.DataClasses.RelatedEnd.DeferredLoad() at System.Data.Objects.DataClasses.EntityCollection 1.get_Count（）在WriteArrayOfProjectToXml（XmlWriterDelegator，Object，XmlObjectSerializerWriteContext，CollectionDataContract）在System.Runtime.Serialization.CollectionDataContract.WriteXmlValue（XmlWriterDelegator xmlWriter，Object obj，XmlObjectSerializerWriteContext context）在System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue（DataContract dataContract，XmlWriterDelegator xmlWriter，Object obj，RuntimeTypeHandle declaredTypeHandle）在System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType（DataContract dataContract，XmlWriterDelegator xmlWriter，Object obj，RuntimeTypeHandle declaredTypeHandle）在System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize（XmlWriterDelegator xmlWriter，Object obj，Boolean isDeclaredType，Boolean writeXsiType，Int32 declaredTypeID，RuntimeTypeHandle declaredTypeHandle）在WriteUserToXml（XmlWriterDelegator，Object，XmlObjectSerializerWriteContext，ClassDataContract）在System.Runtime.Serialization.ClassDataContract.WriteXmlValue（XmlWriterDelegator xmlWriter，Object obj，XmlObjectSerializerWriteContext context）在System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue（DataContract dataContract，XmlWriterDelegator xmlWriter，Object obj，RuntimeTypeHandle declaredTypeHandle）在System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType（DataContract dataContract，XmlWriterDelegator xmlWriter，Object obj，RuntimeTypeHandle declaredTypeHandle）在System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize（XmlWriterDelegator xmlWriter，Object obj，Boolean isDeclaredType，Boolean writeXsiType，Int32 declaredTypeID，RuntimeTypeHandle declaredTypeHandle）在WriteArrayOfUserToXml（XmlWriterDelegator，Object，XmlObjectSerializerWriteContext，CollectionDataContract）在System.Runtime.Serialization.CollectionDataContract.WriteXmlValue（XmlWriterDelegator xmlWriter，Object obj，XmlObjectSerializerWriteContext context）在System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue（DataContract dataContract，XmlWriterDelegator xmlWriter，Object obj，RuntimeTypeHandle declaredTypeHandle）在System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType（DataContract dataContract，XmlWriterDelegator xmlWriter，Object obj，RuntimeTypeHandle declaredTypeHandle）在System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent（XmlWriterDelegator writer，Object graph，DataContractResolver dataContractResolver）在System.Runtime.Serialization.DataContractSerializer.InternalWriteObject（XmlWriterDelegator writer，Object graph，DataContractResolver dataContractResolver）在System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions（XmlWriterDelegator writer，Object graph，DataContractResolver dataContractResolver）在System.Runtime.Serialization.XmlObjectSerializer.WriteObject（XmlDictionaryWriter writer，Object graph）在System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameterPart（XmlDictionaryWriter writer，PartInfo part，Object graph）在System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameter（XmlDictionaryWriter writer，PartInfo part，Object graph）在System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeBody（XmlDictionaryWriter writer，MessageVersion version，String action，MessageDescription messageDescription，Object returnValue，Object [] parameters，Boolean isRequest）在System.ServiceModel.Dispatcher.OperationFormatter.SerializeBodyContents（XmlDictionaryWriter writer，MessageVersion version，Object [] parameters，Object returnValue，Boolean isRequest）在System.ServiceModel.Dispatcher.OperationFormatter.OperationFormatterMessage.OperationFormatterBodyWriter.OnWriteBodyContents（XmlDictionaryWriter writer）在System.ServiceModel.Channels.BodyWriterMessage.OnWriteBodyContents（XmlDictionaryWriter writer）在System.ServiceModel.Channels.Message.OnWriteMessage（XmlDictionaryWriter writer）在System.ServiceModel.Channels.BufferedMessageWriter.WriteMessage（消息消息，BufferManager bufferManager，Int32 initialOffset，Int32 maxSizeQuota） at System.ServiceModel.Channels.TextMessageEncoderFactory.TextMessageEncoder.WriteMessage（消息消息，Int32 maxMessageSize，BufferManager bufferManager，Int32 messageOffset）在System.ServiceModel.Channels.HttpOutput.SerializeBufferedMessage（消息消息）在System.ServiceModel.Channels.HttpOutput.Send（TimeSpan超时）在System.ServiceModel.Channels.HttpPipeline.EmptyHttpPipeline.SendReplyCore（消息消息，TimeSpan超时）在System.ServiceModel.Channels.HttpPipeline.EmptyHttpPipeline.SendReply（消息消息，TimeSpan超时）在System.ServiceModel.Channels.HttpRequestContext.OnReply（消息消息，TimeSpan超时）在System.ServiceModel.Activation.HostedHttpContext.OnReply（消息消息，TimeSpan超时）在System.ServiceModel.Channels.RequestContextBase.Reply（消息消息，TimeSpan超时）在System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.Reply（MessageRpc＆amp; amp; rpc）System.ObjectDisposedException：ObjectContext实例已被释放，不能再用于需要连接的操作。在System.Data.Objects.ObjectContext.EnsureConnection（）在System.Data.Objects.ObjectQuery 1.GetResults(Nullable 1 forMergeOption）在System.Data.Objects.ObjectQuery 1.Execute(MergeOption mergeOption) at System.Data.Objects.DataClasses.EntityCollection 1.Load（List 1 collection, MergeOption mergeOption) at System.Data.Objects.DataClasses.EntityCollection 1.Load（MergeOption mergeOption）在System.Data.Objects.DataClasses.RelatedEnd.Load（）在System.Data.Objects.DataClasses.RelatedEnd.DeferredLoad（）在System.Data.Objects.DataClasses.EntityCollection 1.get_Count() at WriteArrayOfProjectToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , CollectionDataContract ) at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context) at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle) at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle) at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle) at WriteUserToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract ) at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context) at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle) at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle) at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle) at WriteArrayOfUserToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , CollectionDataContract ) at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context) at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle) at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle) at System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver) at System.Runtime.Serialization.DataContractSerializer.InternalWriteObject(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver) at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver) at System.Runtime.Serialization.XmlObjectSerializer.WriteObject(XmlDictionaryWriter writer, Object graph) at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameterPart(XmlDictionaryWriter writer, PartInfo part, Object graph) at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeParameter(XmlDictionaryWriter writer, PartInfo part, Object graph) at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.SerializeBody(XmlDictionaryWriter writer, MessageVersion version, String action, MessageDescription messageDescription, Object returnValue, Object[] parameters, Boolean isRequest) at System.ServiceModel.Dispatcher.OperationFormatter.SerializeBodyContents(XmlDictionaryWriter writer, MessageVersion version, Object[] parameters, Object returnValue, Boolean isRequest) at System.ServiceModel.Dispatcher.OperationFormatter.OperationFormatterMessage.OperationFormatterBodyWriter.OnWriteBodyContents(XmlDictionaryWriter writer) at System.ServiceModel.Channels.BodyWriterMessage.OnWriteBodyContents(XmlDictionaryWriter writer) at System.ServiceModel.Channels.Message.OnWriteMessage(XmlDictionaryWriter writer) at System.ServiceModel.Channels.BufferedMessageWriter.WriteMessage(Message message, BufferManager bufferManager, Int32 initialOffset, Int32 maxSizeQuota) at System.ServiceModel.Channels.TextMessageEncoderFactory.TextMessageEncoder.WriteMessage(Message message, Int32 maxMessageSize, BufferManager bufferManager, Int32 messageOffset) at System.ServiceModel.Channels.HttpOutput.SerializeBufferedMessage(Message message) at System.ServiceModel.Channels.HttpOutput.Send(TimeSpan timeout) at System.ServiceModel.Channels.HttpPipeline.EmptyHttpPipeline.SendReplyCore(Message message, TimeSpan timeout) at System.ServiceModel.Channels.HttpPipeline.EmptyHttpPipeline.SendReply(Message message, TimeSpan timeout) at System.ServiceModel.Channels.HttpRequestContext.OnReply(Message message, TimeSpan timeout) at System.ServiceModel.Activation.HostedHttpContext.OnReply(Message message, TimeSpan timeout) at System.ServiceModel.Channels.RequestContextBase.Reply(Message message, TimeSpan timeout) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.Reply(MessageRpc&amp; rpc)</ExceptionString></Exception></TraceRecord></DataItem></TraceData></ApplicationData></E2ETraceEvent>

将自动生成的实体类从我的Web服务返回到客户端时收到以下CommunicationException错误

导入数据库模型时会自动生成User类，但在调用以下方法时，它不会通过Web服务传递给客户端。

  using (UserService1Client db = new UserService1Client()) {

             User[] newarray = db.userSearch(this.Model.Forename, 
                   this.Model.Surname, 
                   this.Model.Certifications, this.Model.UserTypes);
         kTrace); 
            }

这是我的堆栈跟踪..

A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in mscorlib.dll
There was a communication problem. The underlying connection was closed: The connection was closed unexpectedly.
Server stack trace: 
   at System.ServiceModel.Channels.HttpChannelUtilities.ProcessGetResponseWebException(WebException webException, HttpWebRequest request, HttpAbortReason abortReason)
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
   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 SimpleMvvmWpf1.Local_DatabaseServiceCS4.IUserService1.userSearch(String Forename, String Surname, String Certifications, String UserTypes)
   at SimpleMvvmWpf1.Local_DatabaseServiceCS4.UserService1Client.userSearch(String Forename, String Surname, String Certifications, String UserTypes) in i:\TRUNK\SimpleMvvmWpf1\SimpleMvvmWpf1\Service References\Local_DatabaseServiceCS4\Reference.cs:line 1613
   at SimpleMvvmWpf1.SearchViewModel.SubmitSearch() in i:\TRUNK\SimpleMvvmWpf1\SimpleMvvmWpf1\ViewModels\SearchViewModel.cs:line 51

我的方法..

[OperationContract]
[WebGet(ResponseFormat = WebMessageFormat.Xml, UriTemplate = "GetUsers", BodyStyle = WebMessageBodyStyle.WrappedRequest)]
List<User> GetUsers();


       public List<UserProfile> GetUsers()
    {
        using (cs4_databaseEntities entities = new cs4_databaseEntities())
        {
            try
            {
                var queryResult = from i in entities.Users select i;
                List<User> uList= queryResult.ToList();
                return uList; 
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                return new List<UserProfile>();
            }
        }
    }

User Class有[DataContractAttribute（IsReference = true）]，变量有[DataMemberAttribute（）]但是我还没有得到任何东西，我也玩过绑定配置设置closeTimeout="00:40:00" openTimeout="00:40:00" receiveTimeout="00:40:00" sendTimeout="00:40:00" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647" maxBufferPoolSize="2147483647"

任何帮助都会很棒，这让我的大脑充满了感情！

Answer 1

您的代码正在使用所谓的Lazy Loading，简而言之，这意味着数据实际上只能按需读取。这将在响应序列化期间发生（因为它显示在堆栈跟踪中），在DbContext（在这种情况下为cs4_databaseEntities）处理之后很久 - 因为它仅存在于using块内。最简单的解决方案是禁用延迟加载：

yourContext.ContextOptions.LazyLoadingEnabled = false;

请参阅有关此主题的示例this good article。

WCF客户端不使用Web Service中的用户定义数据类型（包括SCVTrace）

1 个答案: