Find all rows in a list containing x or y?

Question

Can I do this without going through the whole list?

List<string> responseLines = new List<string>();

the list is populated with approximately 300 lines of text.

next I want to search the list and create a second list of all lines that begin with "abc" or contain "xyz".

I know what I can do for everyone, but is there a better / faster way?

Answer 1

You can use LINQ. This is no different than using performance foreach- this is pretty much what it does behind the scenes - but you may prefer the syntax:

var query = responseLines.Where(s => s.StartsWith("abc") || s.Contains("xyz"))
                         .ToList();

( IEnumerable<string>, List<string>, ToList.)

Answer 2

var newList = (from line in responseLines
              where line.StartsWith("abc") || line.Contains("xyz")
              select line).ToList();

Answer 3

:

List<string> responseLines = new List<string>();
List<string> myLines = responseLines.Where(line => line.StartsWith("abc", StringComparison.InvariantCultureIgnoreCase) || line.Contains("xyz")).ToList();

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Answer 4

LINQ:

List<string> list = responseLines.Where(x => x.StartsWith("abc") || x.Contains("xyz")).ToList();

Answer 5

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    var query = File.ReadLines("input.txt").
        Where(s => s.StartsWith("abc") || s.Contains("xyz"))
        .ToList();

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