Linq to SQL Strange SQL Translation

Posted by Master Morality on Stack Overflow See other posts from Stack Overflow or by Master Morality
Published on 2011-02-18T14:49:07Z Indexed on 2011/02/18 15:25 UTC
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I have a simple query that is generating some odd SQL translations, which is blowing up my code when the object is saturated.

from x in DataContext.MyEntities
select new 
{
    IsTypeCDA = x.EntityType == "CDA" 
    //x.EntityType is a string and EntityType.CDA is a const string...
}

I would expect this query should translate to:

SELECT (CASE WHEN [t0].[EntityType] = @p1 THEN 1 ELSE 0 END) as [IsTypeCDA]
...

Instead I get this :

SELECT 
(CASE 
    WHEN @p1 = [t0].[EntityType] THEN 1
    WHEN NOT (@p1 = [t0].[EntityType]) THEN 0
    ELSE NULL
 END) AS [IsTypeCDA]
... 

Since I'm saturating a POCO where IsTypeCDA is a bool, it blows up stating I can't assign null to bool.

Any thoughts?

Edit: fixed the property names so they make sense...

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