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Tip# 508
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Subject: LINQ: Workaround for SQL CASE?
Updated: Nov-19-2007
Rating: Not Rated
By: Rocky Moore - Member #: 1
Location: Klamath Falls, Oregon USA
Website: www.RockyMoore.com
Category: Computers > Programming > Databases
Rate This Tip (10=Great):  1  2  3  4  5  6  7  8  9  10
Have you run into the need to handle a conversion in LINQ from a SQL that used CASE function?

Here is the usage example in the SQL Books Online:

SELECT ShipVia, CASE ShipVia 
    WHEN 1 THEN 'A.Datum'
    WHEN 2 THEN 'Contoso'
    WHEN 3 THEN 'Consolidated Messenger'
        ELSE 'Unknown'
        END
FROM Orders


In C# you can use the Conditional/Ternary operator and cause LINQ to generate the SQL Case function calls in its call.  Here is the above example in LINQ:

from o in Orders
select new { ShipVia = o.ShipVia,  ShipViaName = 
     o.ShipVia == 1 ? "A.Datum' :
     o.ShipVia == 2 ? "Contoso" :
     o.ShipVia == 3 ? "Consolidated Messenger" :
     "Unknown"  }


Works handy when you are in a pinch!

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