CODEWITHSUNDEEP
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Midhun Mathew
Midhun Mathew

Reputation: 319

Get Index of a string from list of string

I am trying to get values from a list. In the result I need the index of the value in the resulting list also. I dont have any idea how to get it. Can someone get me some ideas. Following is the code which i use.

        List<string> Lst1 = new List<string>();
        Lst1.Add("a");
        Lst1.Add("ab");
        Lst1.Add("c");
        Lst1.Add("d");

        List<string> result = Lst1.Select(x => x.Substring(0, 1)).ToList();

Upvotes: 0

Views: 82

Answers (2)

Rahul Singh
Rahul Singh

Reputation: 21795

You can use second overload of Enumerable.Select:-

 var result = Lst1.Select((v, i) => new { Value = v, Index = i });

Working Fiddle Demo.

Upvotes: 1

poke
poke

Reputation: 387527

Enumerable.Select has an overload that gives the index too, so you can just use that. Note that you cannot store both the string and the index in a List<string>, so you maybe need a List<Tuple<string, int>> instead. Also note, that in a list, each element already has an index, so you don’t really need this anyway.

List<Tuple<string, int>> result = Lst1.Select(
        (x, i) => new Tuple<string, int>(x.Substring(0, 1), i)).ToList();

Upvotes: 4

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