CODEWITHSUNDEEP
c#linq
Rejk
Rejk

Reputation: 43

Linq Index question

Can I write code like this with index

var someArray = new List<int>(){1,2,3,4,5};
var resultArray = someArray.Where((num, index) => index % 2 == 0);

like

var resultArray = from num in someArray...

Upvotes: 4

Views: 326

Answers (3)

Richard Dalton
Richard Dalton

Reputation: 35803

The only way seems to be to hack around the problem:

var count = 0;
var resultArray = from num in someArray
                  let index = count++
                  where index % 2 == 0
                  select num;

Probably better to use the other syntax.

Upvotes: 1

AakashM
AakashM

Reputation: 63378

I suppose you are asking "can I use query expression syntax to get at the overload of Where that provides the item index, in the way that I can using fluent method-chaining syntax".

The answer is no.

As seen in the docs for the no-index-parameter overload of Where :

In query expression syntax, a where clause translates to an invocation of Where<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>).

Upvotes: 3

Darin Dimitrov
Darin Dimitrov

Reputation: 1039498

No, you cannot. There is no equivalent for the Where extension method allowing you to use the index using LINQ syntax.

Upvotes: 2

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