Concatenate a constant string to each item in a List<string> using LINQ

Question

I am using C# and .Net 4.0.

I have a List<string> with some values, say x1, x2, x3. To each of the value in the List<string>, I need to concatenate a constant value, say "y" and get back the List<string> as x1y, x2y and x3y.

Is there a Linq way to do this?

Habib · Accepted Answer · 2012-10-22 07:06:53Z

18

List<string> yourList = new List<string>() { "X1", "Y1", "X2", "Y2" };
yourList = yourList.Select(r => string.Concat(r, 'y')).ToList();

answered Oct 22, 2012 at 7:06

Habib

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1 Comment

itsbalur Over a year ago

Thanks for all the answers. I picked this as answer for the Concat, otherwise similar to most of other responses. :-)

Sergey Berezovskiy · Accepted Answer · 2012-10-22 07:04:51Z

7

list = list.Select(s => s + "y").ToList();

answered Oct 22, 2012 at 7:04

Sergey Berezovskiy

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Comments

Paolo Tedesco · Accepted Answer · 2012-10-22 08:56:59Z

5

An alternative, using ConvertAll:

List<string> l = new List<string>(new [] {"x1", "x2", "x3"} );
List<string> l2 = l.ConvertAll(x => x + "y");

edited Oct 22, 2012 at 8:56

answered Oct 22, 2012 at 7:08

Paolo Tedesco

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2 Comments

itsbalur Over a year ago

thanks @Paolo, I have tested that this works fine too for my needs. Is there particular reason I should choose the "ConvertAll" approach over the "Select"?

Paolo Tedesco Over a year ago

@itsbalur: Not really, infact I used ConvertAll only because there were already several other select-based answers :)

Asif Mushtaq · Accepted Answer · 2012-10-22 07:15:20Z

1

You can use Select for that

var list = new List<string>(){ "x1", "x2" };

list = list.Select(s =>  s + "y").ToList();

edited Oct 22, 2012 at 7:15

answered Oct 22, 2012 at 7:04

Asif Mushtaq

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