WCF尝试检索数据表时发生错误但没有数据集

Question

我有两种方法的wcf basicHttpBinding服务。 方法1执行一个oracle打包的存储过程，它在数据集中返回两个数据表。这工作正常。

方法2返回一个带有简单选择语句的（单个）表格。这与例外 为什么失败？

System.ServiceModel.CommunicationException was caught 
    Message=An error occurred while receiving the HTTP response to http://localhost:10500/WcfOracle.svc. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details. 
    Source=mscorlib 
    StackTrace: 
    Server stack trace: 
     at System.ServiceModel.Channels.HttpChannelUtilities.ProcessGetResponseWebException(WebException webException, HttpWebRequest request, HttpAbortReason abortReason) 
     at System.ServiceModel.Channels.HttpChannelFactory.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.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs) 
     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 svcOracleTestRig.wcfOracle.IWcfOracle.Select(String stmt, Boolean LeaveConnectionOpen) 
     at svcOracleTestRig.wcfOracle.WcfOracleClient.Select(String stmt, Boolean LeaveConnectionOpen) in D:\iWorx-dev-v1\WCF4\svcOracle\svcOracleTestRig\Service References\wcfOracle\Reference.cs:line 180 
     at svcOracleTestRig.Form1.button2_Click(Object sender, EventArgs e) in D:\iWorx-dev-v1\WCF4\svcOracle\svcOracleTestRig\Form1.cs:line 98 
    InnerException: System.Net.WebException 
     Message=The underlying connection was closed: An unexpected error occurred on a receive. 
     Source=System 
     StackTrace: 
      at System.Net.HttpWebRequest.GetResponse() 
      at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout) 
     InnerException: System.IO.IOException 
      Message=Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. 
      Source=System 
      StackTrace: 
       at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) 
       at System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size) 
       at System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead) 
      InnerException: System.Net.Sockets.SocketException 
       Message=An existing connection was forcibly closed by the remote host 
       Source=System 
       ErrorCode=10054 
       NativeErrorCode=10054 
       StackTrace: 
         at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) 
         at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) 
       InnerException: 

Answer 1

不要从Web服务操作中返回数据集。原因如下： http://www.hanselman.com/blog/ReturningDataSetsFromWebServicesIsTheSpawnOfSatanAndRepresentsAllThatIsTrulyEvilInTheWorld.aspx