How can I extract an integer value from a list containing a text string? [duplicate]

Question

I have the following list:

    List<string> scores = new List<string>
    {
        "1 point",
        "2 points",
        "5 points",
        "10 points",
        "15 points",
        "20 points",
        "25 points",
        "30 points",
        "40 points",
        "50 points"
    };

My code GUI selects one of these and returns a value from 0 to 9.

How can I convert return a number from 1 to 50 given the 0-9 number?

How does your GUI decide that one of these values should return 0-9? Based on its index? — mishamosher
– mishamosher, Commented Aug 29, 2017 at 3:11
what do you mean 0 to 9? Is it an index value or the value of your list itself? — Vijunav Vastivch
– Vijunav Vastivch, Commented Aug 29, 2017 at 3:13
Duplicates hopefully cover both question in title (extract number) and body (index of element or element by index). If you are asking about something else please edit to clarify. (Probably mapping 0-9 range to 1-50 numbers should be done with Dictionary<int, int> altogether....) — Alexei Levenkov
– Alexei Levenkov, Commented Aug 29, 2017 at 3:44

Ghasan غسان · Accepted Answer · 2017-08-29 04:30:43Z

3

As this link suggests, Regex can be helpful here:

Given an integer (between 0 and 9, do the checking beforehand to ensure it is in that range):

resultString = Regex.Match(scores[x], @"\d+").Value;
var points = Int32.Parse(resultString);

P.S. You'll need to have using System.Text.RegularExpressions;

edited Aug 29, 2017 at 4:30

Ghasan غسان

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answered Aug 29, 2017 at 3:11

Keyur PATEL

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Comments

Nico · Accepted Answer · 2017-08-29 03:21:49Z

2

If by My code GUI selects one of these you mean a selection is made from this list and you would like to know its index you could try.

var testInput = "10 points";
var scores = new List<string>
{
    "1 point",
    "2 points",
    "5 points",
    "10 points",
    "15 points",
    "20 points",
    "25 points",
    "30 points",
    "40 points",
    "50 points"
}; 
var index = scores.IndexOf(testInput); //<- Returns 3

If you mean your value is 3 and you want to turn that to 10 points you can do the following.

var index = 3;
var scores = new List<string>
{
    "1 point",
    "2 points",
    "5 points",
    "10 points",
    "15 points",
    "20 points",
    "25 points",
    "30 points",
    "40 points",
    "50 points"
}; 
var score = scores[index]; //<- Returns 10 points

edited Aug 29, 2017 at 3:21

answered Aug 29, 2017 at 3:14

Nico

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1 Comment

mishamosher Over a year ago

couldn't have done it better!

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