Question

Is there a good way to provide an “auto-increment” style index column (from 1..x) when projecting items using LINQ?

As a basic example, I’m looking for the index column below to go from 1 to the number of items in list.

var items = from s1 in list
    select new BrowsingSessionItemModel { Id = s1.Id, Index = 0 };

Iterating through the list would be the easy option but I was wondering if there was a better way to do this?

Answer 1

You can’t do this with LINQ expressions. You could use the following .Select extension method though:

var items = list.Select((x, index) => new BrowsingSessionItemModel { 
    Id = x.Id, 
    Index = index 
});