为什么我突然收到这个错误？

所以我有一个WCF服务,里面有一个Process()方法.此方法从一个表中读取字节数组(文件),并基本上将该文件中的数据放入多个表中.它只是遍历每一行.它在生产环境中工作了一个月以来一直很好.现在突然间,它间歇地抛出这个错误:

System.InvalidOperationException:与当前连接关联的事务已完成但尚未处理.必须先处理事务,然后才能使用连接执行SQL语句.

可能有所帮助的东西:大约2周前,我们更换了生产网络和数据库服务器.我们搬家后,这个错误一直在呕吐.当我们在旧服务器上时,我从未遇到过这个问题.但问题是,这个错误在前9-10天没有发生.现在它突然间歇地发生了.我已经上传了大文件(1k-2.5k行)并且它们工作正常,并且这个错误会引发更小的200行文件!并且服务有时会完美地处理相同的文件.

代码片段:(它更大,但重复类似的操作)

using (var scope = new TransactionScope())
{
    // loop through each row/invoice
    foreach (var row in Rows)
    {
        Invoice invoice = (Invoice)CreateObjectWithConstantData(typeof(Invoice), doc, applicationName);
        invoice = (Invoice)FillObjectWithUserData(invoice, row, -1, -1, string.Empty);
        invoice.InvoiceNumber = InvoiceDBImpl.SaveInvoice(invoice, processFileRequest.RunId);

        if (invoice.InvoiceNumber == Guid.Empty)
        {
            throw new DataAccessException(string.Format(Messages.ErrorSavingInvoice, invoice.ReceiptId, invoice.ProductID));
        }
    }
}

堆栈跟踪之一:

   at System.Data.SqlClient.TdsParser.TdsExecuteRPC(_SqlRPC[] rpcArray, Int32 timeout, Boolean inSchema, SqlNotificationRequest notificationRequest, TdsParserStateObject stateObj, Boolean isCommandProc)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe)
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult)
   at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries)
   at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
   at System.Data.Linq.DataContext.ExecuteMethodCall(Object instance, MethodInfo methodInfo, Object[] parameters)
   at Tavisca.TramsFileService.DataAccess.TramsDBDataContext.SaveTramsPayment(Nullable`1 paymentDate, String paymentType, Nullable`1 totalAmount, String bankAccount, String paymentMethod, String branch, String remarks, String creditCardLast4, String payeeName, String profileNumber, Nullable`1& paymentId)
   at Tavisca.TramsFileService.DataAccess.PaymentDBImpl.<>c__DisplayClass1.b__0(TramsDBDataContext dc)
   at Tavisca.TramsFileService.DataAccess.SystemDataContext.PerformOperation(Action`1 action)
   at Tavisca.TramsFileService.DataAccess.PaymentDBImpl.SavePayment(Payment payment)
   at Tavisca.TramsFileService.Core.TramsFileController.ProcessFile(ProcessFileRQ processFileRequest)
   at Tavisca.TramsFileService.ServiceImplementation.TramsFileServiceImpl.ProcessFile(ProcessFileRQ processFileRequest)

我经历了一些链接:

链接1

链接2

链接3

他们都建议在machine.config上增加TimeOut,但我不确定为什么它有时会起作用而在其他时候不起作用.这不应该一致吗？