Question

I have a List of strings that contains 16 strings . user selects to copy items with indexes of 0,5,6,10,15 of this list to the second List .

is there any way to do this by linq ?

Answer 1

Assuming that you already have the indices in a collection, you can use Enumerable.ElementAt which just uses the indexer for IList<T>, hence it’s very efficient:

var indices = new List<int>(){ 0,5,6,10,15 };
List<String> result = indices.Select(i => strings.ElementAt(i)).ToList();

If you don’t want to create a new list but copy them into an existing list:

other.AddRange(indices.Select(i => strings.ElementAt(i)));