实体框架错误，一个表总是超时

Question

我有以下代码从5个不同的表中获取数据库的特定用户详细信息。

var userValues = usrRepository.AsQueryable()
    .Where(user => user.UserType == (int)GlobalEnumeration.UserType.MDappUser && user.IsActive == true)
    .Include(f => f.appusraddrs)
    .Include(c => c.usrcalendar)
    .Include(f => f.usrattributes)
    .Include("usrAttributes.usrAttributeValues")
    .Include("usrAttributes.usrAttributeValues.ApplicationAttributeValue")
    .ToList();

但是，当我尝试使用最后一个include .Include("usrAttributes.usrAttributeValues.ApplicationAttributeValue")来包含表ApplicationAttributeValue时，总是会收到超时错误。

如果不包括该表，则不会出现错误。

错误堆栈

MySql.Data.MySqlClient.MySqlException (0x80004005): Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding. ---> System.TimeoutException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond ---> System.IO.IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at MySql.Data.Common.MyNetworkStream.Read(Byte[] buffer, Int32 offset, Int32 count)
--- End of inner exception stack trace ---
at MySql.Data.Common.MyNetworkStream.HandleOrRethrowException(Exception e)
at MySql.Data.Common.MyNetworkStream.Read(Byte[] buffer, Int32 offset, Int32 count)
at MySql.Data.MySqlClient.TimedStream.Read(Byte[] buffer, Int32 offset, Int32 count)
at System.IO.BufferedStream.Read(Byte[] array, Int32 offset, Int32 count)
at MySql.Data.MySqlClient.MySqlStream.ReadFully(Stream stream, Byte[] buffer, Int32 offset, Int32 count)
at MySql.Data.MySqlClient.MySqlStream.LoadPacket()
at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
at MySql.Data.MySqlClient.NativeDriver.GetResult(Int32& affectedRow, Int64& insertedId)
at MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean force)
at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
at MySql.Data.MySqlClient.ExceptionInterceptor.Throw(Exception exception)
at MySql.Data.MySqlClient.MySqlConnection.HandleTimeoutOrThreadAbort(Exception ex)
at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
at MySql.Data.Entity.EFMySqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
at System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)

和

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)
at MyBusiness.Business.SearchIndexing.SearchIndexBC.GetMyBusinessDetails()
at MyBusiness.Framework.Indexing.Services.IndexingTaskExecutor.BatchIndex(String indexName, String settingsFilename, IndexSettings indexSettings)
at MyBusiness.Framework.Indexing.Services.IndexingTaskExecutor.UpdateIndexBatch(String indexName)
at MyBusiness.Business.ProfileManagement.ProfileManagementBC.UpdateOtherDetails(appuser user)

Answer 1

通过添加((IObjectContextAdapter)this.context).ObjectContext.CommandTimeout = 180;来延长ObjectContext的超时时间来解决