LINQ method like List.Exists(predicate)?

Question

I'm looking for LINQ method like List.Exists(predicate).

bool exists = mylist.Exists(p => p.Name == "Kamila");

bool exists = collection.??????(p => p.Name == "Kamila");

score 6 · Accepted Answer · edited Sep 29 '17 at 16:56

6

Use the .Any method:

//Will return true (and stop future iteration the moment the predicate is met)
//Otherwise false
bool exists = collection.Any(p => p.Name == "Kamila");

edited Sep 29 '17 at 16:56

Sebastian Brosch

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answered Oct 14 '16 at 09:49

Gilad Green

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For linking to documentation, +1. I admire that. – Mike Eason Oct 14 '16 at 09:52
@MikeEason - I always try to attack the SO documentation - many people work very hard - why not give credit :) – Gilad Green Oct 14 '16 at 09:53
3

Another approach: `collection.Select(p => p.Name).Contains("Kamila")` – Tim Schmelter Oct 14 '16 at 09:56
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Another approach2(less readable): `!collection.All(p => p.Name != "Kamila")` – Tim Schmelter Oct 14 '16 at 10:00

score 2 · Answer 2 · edited May 23 '17 at 12:10

2

You are looking for Any:

bool exists = collection.Any(p => p.Name == "Kamila");

It is an Extension Method for any IEnumerable<T> defined on System.Linq.Enumerable.

Check this post for more details: Linq .Any VS .Exists - Whats the difference?

edited May 23 '17 at 12:10

Community

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answered Oct 14 '16 at 09:49

Salah Akbari

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#Gilad Green was 6 seconds faster :), but +1 for good answer. – marbel82 Oct 14 '16 at 10:06
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@marbel82 Yes. I like this behavior. :) – Salah Akbari Oct 14 '16 at 10:07

LINQ method like List.Exists(predicate)?

2 Answers2