Question

我正在使用在多个表中具有重复数据的SQL数据源。我无法控制数据库。对于我的项目，我创建了一个EF模型和一个公开它的ADO.NET数据服务（使用VS 2008）。我还有一个使用该服务的.NET客户端应用程序。

现在，这些db表有很多常见的字段，在向服务发送插入请求之前，我需要在客户端中进行水合。因此，为了避免重复代码，我在EF模型中创建了一个抽象基类，并将所有常见属性放入其中。此基类的实体集名称为OrderEntries。从其继承的实体之一称为OEORDH。它映射到db表。为了公开这个实体，我创建了一个WebGet服务方法，因为查询使用OfType方法，该方法没有支持ATOM的翻译;因此我不能在我的客户端使用它。这是方法：

<WebGet()> _
Public Function Orders() As IQueryable(Of OEORDH)
    Dim results = From x In Me.CurrentDataSource.OrderEntries.OfType(Of OEORDH)()
    Return results
End Function

当我在浏览器中访问此方法（http：// localhost：1187 / MyService.svc / Orders）时，我收到一个非常一般的错误：

<link rel="self" title="Orders" href="Orders" />
  <m:error>
    <m:code></m:code>
    <m:message xml:lang="en-US">An error occurred while processing this request.</m:message>
  </m:error>

但我知道查询被调用，而且，当我在调试中看到Locals窗口时，我看到它返回了正确的对象集合。查询非继承实体的其他Web方法工作得很好。有什么问题？

更新我按照史蒂夫的建议，将IncludeExceptionDetailInFaults设为真。我还将UseVerboseErrors设置为true。跟踪日志现在显示抛出的异常是System.ServiceModel.CommunicationObjectAbortedException，它仍然非常通用。我在网上搜索，但没有找到任何具体的东西。消息是：通信对象System.ServiceModel.Channels.TransportReplyChannelAcceptor + TransportReplyChannel不能用于通信，因为它已被中止。这是堆栈内容：

System.ServiceModel.Channels.CommunicationObject.ThrowIfAborted()
System.ServiceModel.Channels.InputQueueChannel`1.EndDequeue(IAsyncResult result, TDisposable&amp; item)
System.ServiceModel.Channels.ReplyChannel.EndTryReceiveRequest(IAsyncResult result, RequestContext&amp; context)
System.ServiceModel.Dispatcher.ReplyChannelBinder.EndTryReceive(IAsyncResult result, RequestContext&amp; requestContext)
System.ServiceModel.Dispatcher.ErrorHandlingReceiver.EndTryReceive(IAsyncResult result, RequestContext&amp; requestContext)
System.ServiceModel.Dispatcher.ChannelHandler.AsyncMessagePump(IAsyncResult result)
System.ServiceModel.Dispatcher.ChannelHandler.OnAsyncReceiveComplete(IAsyncResult result)
System.ServiceModel.Diagnostics.Utility.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
System.ServiceModel.AsyncResult.Complete(Boolean completedSynchronously)
System.ServiceModel.Channels.InputQueue`1.AsyncQueueReader.Set(Item item)
System.ServiceModel.Channels.InputQueue`1.Shutdown(CommunicationObject communicationObject)
System.ServiceModel.Channels.InputQueueChannel`1.OnClosing()
System.ServiceModel.Channels.CommunicationObject.Abort()
System.ServiceModel.Dispatcher.ReplyChannelBinder.Abort()
System.ServiceModel.Channels.ServiceChannel.OnAbort()
System.ServiceModel.Channels.CommunicationObject.Abort()
System.Data.Services.DelegateBodyWriter.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.HttpStreamMessageEncoderFactory.HttpStreamMessageEncoder.WriteMessage(Message message, Stream stream)
System.ServiceModel.Channels.HttpStreamMessageEncoderFactory.HttpStreamMessageEncoder.WriteMessage(Message message, Int32 maxMessageSize, BufferManager bufferManager, Int32 messageOffset)
System.ServiceModel.Channels.WebMessageEncoderFactory.WebMessageEncoder.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.Channels.RequestContextBase.Reply(Message message)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.Reply(MessageRpc&amp; rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessageCleanup(MessageRpc&amp; rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc&amp; rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc&amp; rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc&amp; rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc&amp; rpc)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc&amp; rpc)
System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.Dispatch(MessageRpc&amp; rpc, 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.ServiceModel.Diagnostics.Utility.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
System.ServiceModel.AsyncResult.Complete(Boolean completedSynchronously)
System.ServiceModel.Channels.InputQueue`1.AsyncQueueReader.Set(Item item)
System.ServiceModel.Channels.InputQueue`1.EnqueueAndDispatch(Item item, Boolean canDispatchOnThisThread)
System.ServiceModel.Channels.InputQueue`1.EnqueueAndDispatch(T item, ItemDequeuedCallback dequeuedCallback, Boolean canDispatchOnThisThread)
System.ServiceModel.Channels.InputQueueChannel`1.EnqueueAndDispatch(TDisposable item, ItemDequeuedCallback dequeuedCallback, Boolean canDispatchOnThisThread)
System.ServiceModel.Channels.SingletonChannelAcceptor`3.Enqueue(QueueItemType item, ItemDequeuedCallback dequeuedCallback, Boolean canDispatchOnThisThread)
System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext context, ItemDequeuedCallback 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.PartialTrustHelpers.PartialTrustInvoke(ContextCallback callback, Object state)
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequestWithFlow(Object state)
System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.WorkItem.Invoke2()
System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.WorkItem.Invoke()
System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.ProcessCallbacks()
System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.CompletionCallback(Object state)
System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.ScheduledOverlapped.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
System.ServiceModel.Diagnostics.Utility.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)

ADO.NET数据服务与EF实现表每具体类型（TPCT）继承

0 个答案: