LINQ to Entities: Achieving Case-Sensitive Comparisons
LINQ to Entities queries often inherit the case-insensitive nature of SQL Server. This guide explores methods to enforce case-sensitive comparisons within LINQ to Entities queries.
Understanding Case-Insensitive Behavior
LINQ to Entities translates queries into SQL. SQL Server's default collation is case-insensitive, meaning "Name == 'ThingamaBob'" is treated as a case-insensitive match.
Database-Level (Server-Side) Solution
The most efficient approach is to modify the database column's collation to be case-sensitive. Use a SQL statement like this:
ALTER TABLE Thingies ALTER COLUMN Name VARCHAR(25) COLLATE Latin1_General_CS_AS
This alteration ensures case-sensitive comparisons within both SQL and LINQ to Entities queries.
Application-Level (Client-Side) Workaround
If database modifications are impractical, a client-side solution can be implemented, though it's less performant:
Thingies.Where(t => t.Name == "ThingamaBob") .AsEnumerable() .First(t => t.Name == "ThingamaBob");
This approach retrieves the data to the client, performing the case-sensitive comparison in memory.
Important Considerations
- Utilize
ObjectQuery.ToTraceString()
to examine the generated SQL and verify the collation being used. - LINQ to Entities utilizes expression trees, processed by Object Services into command trees, and finally translated into database commands.
- Client-side case-sensitive comparisons can significantly impact performance compared to server-side solutions. Prefer the server-side method whenever possible.
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