Finding first index of element that matches a condition using LINQ

Question

var item = list.Where(t => somecondition);

I would love to be able to find out the index of the element that was returned, in fact, in my case a

Answer 1

You can project the list items with their indexes first:

var item = list.Select((item, index) => new { Item = item, Index = index })
               .Where(pair => SomeCondition(pair.Item))
               .Select(result => result.Index);