microsoft.public.dotnet.framework

Jeroen Mostert

7/8/2008 4:14:00 PM

abcd wrote:
> I have a list of Custom Objects. Those objects have inner objects. I want to
> filter the list based on inner objects. Currently I am using
>
> List.FindAll (SearchPredicate)
>
> My SearchPredicate is a complex function. How LinQ is going to help me..will
> that improve the performance than calling FindAll.
>
Probably not. LINQ isn't magic. Finding matching elements in an unsorted
collection is inherently an O(N) operation. If you want to improve that,
you'll need some sort of sorting (pardon the expression).

In general, LINQ will not improve the performance of anything (and there are
a few performance pitfalls to avoid, actually); it's a powerful and uniform
way of querying data over arbitrary providers. LINQ primarily offers
productivity benefits.

This is likely to change in the future, because LINQ queries do offer
opportunities for (transparent) optimization (parallelization in
particular). It's not the primary focus, though.

> Any samples for performing filter. Basically, I want to fire one query and
> that should return me list of select objects.
>
As for samples, you can't beat this: http://msdn.microsoft.com/vcshar...

--
J.