如何不调用OracleDataReader.Read（）仍然返回一行？

Question

当我升级到使用OracleManagedDataAccess提供程序时，下面的代码不起作用，我感到困惑，因为源代码从一开始就没有改变，而且它在生产服务器上。

我理解为什么它不起作用，因为它没有调用OracleDataReader.Read（）

那么，这是一个被Oracle识别出来的错误吗？如果是的话你能指出文件吗？在项目简单引用4.112.4.0之前，现在我正在使用Oracle.ManagedDataAccess

其他人觉得这很有意思吗？

Public Function GeCount(ByVal value As Integer) As Integer

            Dim pCount As New PageCount

            Using conn As OracleConnection = New OracleConnection(connString)

                'conn.Open()

                Using cmd As OracleCommand = New OracleCommand()

                    cmd.Connection = conn

                    pCount.PageCnt = 0

                    cmd.CommandText = "SELECT COUNT(*)  FROM dual"



                    cmd.Connection.Open()

                    Using rdr As OracleDataReader = cmd.ExecuteReader()

                        If rdr.HasRows Then

                            If Not rdr.IsDBNull(0) Then pCount.PageCnt = CInt(CInt(rdr.GetDecimal(0)) / pSize)

                        End If

                    End Using

                    cmd.Connection.Close()

                    cmd.Dispose()

                End Using



                conn.Dispose()

            End Using



            Return pCount

        End Function

有什么想法吗？

修改

切换到使用Oracle.ManagedDataAccess.dll之后，我收到了这个错误，这是预期的，但它之前的工作是对Oracle Data Access Client 4.112.4.0的引用

- <Fault xmlns="http://schemas.microsoft.com/ws/2005/05/envelope/none">
- <Code>
  <Value>Receiver</Value> 
- <Subcode>
  <Value xmlns:a="http://schemas.microsoft.com/net/2005/12/windowscommunicationfoundation/dispatcher">a:InternalServiceFault</Value> 
  </Subcode>
  </Code>
- <Reason>
  <Text xml:lang="en-US">Invalid attempt to read when no data is present</Text> 
  </Reason>
- <Detail>
- <ExceptionDetail xmlns="http://schemas.datacontract.org/2004/07/System.ServiceModel" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
  <HelpLink i:nil="true" /> 
  <InnerException i:nil="true" /> 
  <Message>Invalid attempt to read when no data is present</Message> 
  <StackTrace>at Oracle.ManagedDataAccess.Client.OracleDataReader.IsDBNull(Int32 i) at WcfRestService1.WcfRestService1.SiteEDocXRefRepository.GetSiteEDocCount(Int32 site_id) at WcfRestService1.WcfRestService1.EDocSvc.GetCntCollectionXRefSiteEDoc(String site_id) at SyncInvokeGetCntCollectionXRefSiteEDoc(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</StackTrace> 
  <Type>System.InvalidOperationException</Type> 
  </ExceptionDetail>
  </Detail>
  </Fault>