Question

In ASP.NET 4, I’m trying to write a case statement in a group by with LINQ-To-SQL.
For example, I’m trying to do this:

Select ...
FROM Table T
GROUP BY CASE
            WHEN T.COLUMN1 IS NULL THEN T.COLUMN2 
            ELSE T.COLUMN3 
         END

How would you translate that query in LINQ?

Answer 1

Something like

from t in T
group t by (t.Column1 == null ? t.Column2 : t.Column3) into grp
select ... ;