ADO.Net实体框架线程在读取数据时中止异常

Question

使用ADO.Net Entity框架读取数据时,我遇到了一个奇怪的问题.

我有两张桌子,"Surveys"和"PatientVists"."VisitId"是"PatientVists"中的主键,它是"调查"表中的外键.

我正在使用以下查询:

foreach (var survey in db.Surveys.Include(p => p.PatientVisit).Where(p => p.FacilityId == f.Id && p.IsCompleted == true && p.IsImaged == false).OrderBy(p => p.PatientVisit.MrnId).ThenBy(p => p.DateUpdated).ToList())

{
 // reminign code
}

上面的查询似乎很正常.但是在执行查询时我得到线程中止异常.我可以理解,由于数据量很大,我是否会收到超时异常.但我不知道为什么我得到线程中止异常.我没有明确地产生一个线程.此代码段位于Web服务中,但我认为它与此无关.

以下是堆栈跟踪:

System.Threading.ThreadAbortException: Thread was being aborted.
   at SNIReadSyncOverAsync(SNI_ConnWrapper* , SNI_Packet** , Int32 )
   at SNINativeMethodWrapper.SNIReadSyncOverAsync(SafeHandle pConn, IntPtr& packet, Int32 timeout)
   at System.Data.SqlClient.TdsParserStateObject.ReadSniSyncOverAsync()
   at System.Data.SqlClient.TdsParserStateObject.TryReadNetworkPacket()
   at System.Data.SqlClient.TdsParserStateObject.TryPrepareBuffer()
   at System.Data.SqlClient.TdsParserStateObject.TryReadByte(Byte& value)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
   at System.Data.SqlClient.SqlDataReader.get_MetaData()
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
   at System.Data.Objects.Internal.ObjectQueryExecutionPlan.Execute[TResultType](ObjectContext context, ObjectParameterCollection parameterValues)
   at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
   at System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

是重新选择"ToList"运算符还是"include"运算符产生一个线程？我要用Join替换它吗？一般来说,从性能角度来看哪个是首选方法？

如果有人了解特定的例外,请告诉我

谢谢

Answer 1

我认为这是为正在超时的Web应用程序/服务提供服务的基本线程.如果您在自己的线程上生成进程,它应该解决问题.

您还可以尝试在此处发布的解决方法:https: //sharepoint.stackexchange.com/questions/9380/thread-was-being-aborted-with-sharepoint-2010

将以下代码添加到Web.Config:

< system.web >
< httpRuntime executionTimeout="36000" />
< / system.web >

在我将代码更改为在自己的线程中运行之前,它对我来说是一个临时解决方案!