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現有的片段EF4的SaveChanges如何避免內存不足的異常
foreach (var ownerCandidates in ownerToCandidatesDictionary)
{
foreach (var candidate in ownerCandidates.Value)
{
transactionEntities.AddToSomeEntity(someObject)
}
}
transactionEntities.SaveChanges(System.Data.Objects.SaveOptions.AcceptAllChangesAfterSave);
是重寫
int i = 0 ;
foreach (var ownerCandidates in ownerToCandidatesDictionary)
{
foreach (var candidate in ownerCandidates.Value)
{
transactionEntities.AddToSomeEntity(someObject)
}
if (i++ % 1000 == 0)
{
transactionEntities.SaveChanges(System.Data.Objects.SaveOptions.AcceptAllChangesAfterSave);
}
}
transactionEntities.SaveChanges(System.Data.Objects.SaveOptions.AcceptAllChangesAfterSave);
爲我們提供了成功的計劃終止的情況下相同的功能?我關心的是我們一直在添加的功能,SaveChanges在循環中的作用僅僅與自從上一次SaveChanges之後添加的功能一起使用。我們在這裏批量儲存嗎?如果不是這種情況如何原始片段可以被改變,以避免
12/06/2012 7:50:37 PM : System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
at System.Data.Mapping.Update.Internal.Propagator.Project(DbProjectExpression node, PropagatorResult row, TypeUsage resultType)
at System.Data.Mapping.Update.Internal.Propagator.Visit(DbProjectExpression node)
at System.Data.Common.CommandTrees.DbProjectExpression.Accept[TResultType](DbExpressionVisitor`1 visitor)
at System.Data.Mapping.Update.Internal.Propagator.Propagate(UpdateTranslator parent, EntitySet table, DbQueryCommandTree umView)
at System.Data.Mapping.Update.Internal.UpdateTranslator.<ProduceDynamicCommands>d__0.MoveNext()
at System.Linq.Enumerable.<ConcatIterator>d__71`1.MoveNext()
at System.Data.Mapping.Update.Internal.UpdateCommandOrderer..ctor(IEnumerable`1 commands, UpdateTranslator translator)
at System.Data.Mapping.Update.Internal.UpdateTranslator.ProduceCommands()
at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache)
at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options)
但是,我包括的代碼片段,代碼片段2 - 你看到批處理。 – MicMit
是的,行'if(i ++%1000 == 0)'批量生產。每批1000個刀片。 –