Is this Repository pattern efficient with LINQ-to-SQL?

Question

I\'m currently reading the book Pro Asp.Net MVC Framework. In the book, the author suggests using a repository pattern similar to the following.

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Answer 1

Yes linq2sql will generate magic to make it more efficient. It depends on you using the IQueryable interface. If you want to check clamp the SQL profiler on and you can see it generate the appropriate query.

I would recommend introducing a service layer to abstract away your dependancy on linq2sql.