[nhibernate-issues] [JIRA] Commented: (NH-851) More descriptive error message for 'Cannot find constructor' on projections

[NHibernate J. <mik...@us...>]

     [ http://jira.nhibernate.org/browse/NH-851?page=comments#action_14720 ]
     
Ken Egozi commented on NH-851:
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More info at can be found at http://www.kenegozi.com/blog/2007/01/04/NHibernateCouldNotFindConstructorForInSelectNewProjectionQuery.aspx

> More descriptive error message for 'Cannot find constructor' on projections
> ---------------------------------------------------------------------------
>
>          Key: NH-851
>          URL: http://jira.nhibernate.org/browse/NH-851
>      Project: NHibernate
>         Type: Improvement
>   Components: Core
>     Reporter: Ken Egozi
>     Priority: Trivial
>  Attachments: DisplayParametersOnConstructorNotFound.patch
>
> Using .NET 2.0, over SQL Server 2005
> one of the latests changes (I guess) was that "select new Projection(... sum(s.Data)) ... " would assume "long" for the sum element, rather than int.
> So if the projection has "int" in the constructor an exception will occur. 
> However, current users gets a non informative error message.
> attached here a patch that would add the expected types for the contructor's parameters, so it would be easier to fix.
> I was not able to build the solution due to some local problems with nant, so it should be tested.

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