Question

我正在开发一个.net 4.5 wcf服务。此wcf接受包含带有自定义身份验证标头的XML的SOAP消息。将此xml转换为对象，使用以下步骤生成对象定义：

添加服务参考。
引用我收到的包含对象定义的wsdl。
生成包含references.cs的服务引用。这个文件包含对象定义和一些可覆盖的函数，我在其中放置自定义代码。

这一切都很好，直到返回错误为止。每隔一段时间（没有特定的时间跨度，例如3天或1周），Web服务将返回错误＆＃34;对象引用未设置为对象的实例＆＃34;。这似乎发生在System.ServiceModel.dll中，我认为这个dll负责将传入的SOAP Message xml内容转换为对象。最奇怪的部分是当我重新启动Web服务时，错误消失了，一切都按预期工作。

我创建了一个SVCLog，这是结果（与发送消息时返回的错误相同）;

<E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent">
<System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system">
<EventID>131076</EventID>
<Type>3</Type>
<SubType Name="Error">0</SubType>
<Level>2</Level>
<TimeCreated SystemTime="2017-02-08T15:01:36.6393145Z" />
<Source Name="System.ServiceModel" />
<Correlation ActivityID="{72d279c1-d80d-4fa9-8a82-eb3ad1b69f0d}" />
<Execution ProcessName="w3wp" ProcessID="12672" ThreadID="8" />
<Channel />
<Computer>RD0003FF4C676E</Computer>
</System>
<ApplicationData>
<TraceData>
<DataItem>
<TraceRecord Severity="Error" Channel="Operational" xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord">
<TraceIdentifier>http://msdn.microsoft.com/en-US/library/System.ServiceModel.Diagnostics.TraceHandledException.aspx</TraceIdentifier>
<Description>Handling an exception. Exception details: System.NullReferenceException: Object reference not set to an instance of an object.
   at System.ServiceModel.Dispatcher.OperationFormatter.TypedMessageParts.SetValue(Object value, Int32 index)
   at System.ServiceModel.Dispatcher.OperationFormatter.TypedMessageParts.SetTypedMessageParts(Object[] values)
   at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeRequest(Message message, Object[] parameters)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.DeserializeInputs(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</Description>
<AppDomain>/LM/W3SVC/1905215994/ROOT-1-131310166559267906</AppDomain>
<Exception>
<ExceptionType>System.NullReferenceException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType>
<Message>Object reference not set to an instance of an object.</Message>
<StackTrace>
at System.ServiceModel.Dispatcher.OperationFormatter.TypedMessageParts.SetValue(Object value, Int32 index)
at System.ServiceModel.Dispatcher.OperationFormatter.TypedMessageParts.SetTypedMessageParts(Object[] values)
at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeRequest(Message message, Object[] parameters)
at System.ServiceModel.Dispatcher.DispatchOperationRuntime.DeserializeInputs(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)
</StackTrace>
<ExceptionString>System.NullReferenceException: Object reference not set to an instance of an object.
   at System.ServiceModel.Dispatcher.OperationFormatter.TypedMessageParts.SetValue(Object value, Int32 index)
   at System.ServiceModel.Dispatcher.OperationFormatter.TypedMessageParts.SetTypedMessageParts(Object[] values)
   at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeRequest(Message message, Object[] parameters)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.DeserializeInputs(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</ExceptionString>
</Exception>
</TraceRecord>
</DataItem>
</TraceData>
</ApplicationData>
</E2ETraceEvent>

有没有人知道为什么会出现这种错误，如何解决或如何调试？在我的任何代码被命中之前发生错误。困难的部分是它是随机的，所以不可能轻易地再现（直到它再次出现），通过重新启动而不是可调试来修复。在调试器模式下发生异常时Visual Studio将打开源未找到页面。

[编辑] 也许很高兴知道;此wcf托管在Azure应用服务中。

对象引用不是wsdl / wcf应用程序中对象的实例

0 个答案: