[nhibernate-issues] [NHJIRA] Commented: (NH-2733) Using an expression in QueryOver gives: Lambda Parameter not in scope

[Richard B. (JIRA) <nh...@gm...>]

    [ http://216.121.112.228/browse/NH-2733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=21202#action_21202 ] 

Richard Brown commented on NH-2733:
-----------------------------------

Cheers, thanks for the update.

> Using an expression in QueryOver gives: Lambda Parameter not in scope
> ---------------------------------------------------------------------
>
>                 Key: NH-2733
>                 URL: http://216.121.112.228/browse/NH-2733
>             Project:  NHibernate
>          Issue Type: Bug
>          Components: QueryOver
>    Affects Versions: 3.2.0CR1
>            Reporter: Roy Jacobs
>            Assignee: Richard Brown
>            Priority: Major
>             Fix For: 3.2.0CR1
>
>         Attachments: NH2733.zip
>
>
> Among other things we occasionally use an IExpression in a QueryOver 'where', like so:
> query.Where(expression);
> This used to work quite well in the SVN trunk version of last week, but since then this starts breaking with an ArgumentException saying "Lambda Parameter not in scope".
> Now, I've seen that QueryOver got a bit of work done to support things like YearPart etc., so I'm assuming these changes are related.
> The expression is constructed like this:
> public Expression<Func<Item, bool>> GetExpression(DateTime? myStartDate, DateTime? myStopDate)
> {
>   return item => item.StartDateTime < myStopDate.Value && item.StartDateTime >= myStartDate.Value;
> }
> The call-stack (copy/pasted from R# test runner) looks like this:
> --InvalidOperationException
> at System.Linq.Expressions.ExpressionCompiler.GenerateParameterAccess(ILGenerator gen, ParameterExpression p, StackType ask)
> at System.Linq.Expressions.ExpressionCompiler.Generate(ILGenerator gen, Expression node, StackType ask)
> at System.Linq.Expressions.ExpressionCompiler.GenerateMemberAccess(ILGenerator gen, Expression expression, MemberInfo member, StackType ask)
> at System.Linq.Expressions.ExpressionCompiler.Generate(ILGenerator gen, Expression node, StackType ask)
> at System.Linq.Expressions.ExpressionCompiler.GenerateLambda(LambdaExpression lambda)
> at System.Linq.Expressions.ExpressionCompiler.CompileDynamicLambda(LambdaExpression lambda)
> at System.Linq.Expressions.LambdaExpression.Compile()
> at NHibernate.Impl.ExpressionProcessor.EvaluatesToNull(Expression expression) in c:\sandbox\nhibernate\src\NHibernate\Impl\ExpressionProcessor.cs: line 280
> at NHibernate.Impl.ExpressionProcessor.IsMemberExpression(Expression expression) in c:\sandbox\nhibernate\src\NHibernate\Impl\ExpressionProcessor.cs: line 335
> at NHibernate.Impl.ExpressionProcessor.FindMemberProjection(Expression expression) in c:\sandbox\nhibernate\src\NHibernate\Impl\ExpressionProcessor.cs: line 166
> at NHibernate.Impl.ExpressionProcessor.ProcessSimpleExpression(Expression left, Expression right, ExpressionType nodeType) in c:\sandbox\nhibernate\src\NHibernate\Impl\ExpressionProcessor.cs: line 411
> at NHibernate.Impl.ExpressionProcessor.ProcessBinaryExpression(BinaryExpression expression) in c:\sandbox\nhibernate\src\NHibernate\Impl\ExpressionProcessor.cs: line 503
> at NHibernate.Impl.ExpressionProcessor.ProcessAndExpression(BinaryExpression expression) in c:\sandbox\nhibernate\src\NHibernate\Impl\ExpressionProcessor.cs: line 470
> at NHibernate.Impl.ExpressionProcessor.ProcessBinaryExpression(BinaryExpression expression) in c:\sandbox\nhibernate\src\NHibernate\Impl\ExpressionProcessor.cs: line 506
> at NHibernate.Impl.ExpressionProcessor.ProcessExpression(Expression`1 expression) in c:\sandbox\nhibernate\src\NHibernate\Impl\ExpressionProcessor.cs: line 595
> at NHibernate.Criterion.QueryOver`2.Add(Expression`1 expression) in c:\sandbox\nhibernate\src\NHibernate\Criterion\QueryOver.cs: line 749
> at NHibernate.Criterion.QueryOver`2.Where(Expression`1 expression) in c:\sandbox\nhibernate\src\NHibernate\Criterion\QueryOver.cs: line 357
> at NHibernate.Criterion.QueryOver`2.NHibernate.IQueryOver<TRoot,TSubType>.Where(Expression`1 expression) in c:\sandbox\nhibernate\src\NHibernate\Criterion\QueryOver.cs: line 800

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