Will First() perform the OrderBy()?

Posted by Martin on Stack Overflow See other posts from Stack Overflow or by Martin
Published on 2010-03-16T14:15:10Z Indexed on 2010/03/16 14:26 UTC
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LINQ

Is there any difference in (asymptotic) performance between

Orders.OrderBy(order => order.Date).First()

and

Orders.Where(order => order.Date == Orders.Max(x => x.Date));

i.e. will First() perform the OrderBy()? I'm guessing no. MSDN says enumerating the collection via foreach och GetEnumerator does but the phrasing does not exclude other extensions.

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