linq and string array

Question

var result=list.select(element=>element.split['_']).list();
/* I want to extract the part of the file name from a list of file names */

I have an array of file names , and i want to extract part of name from the array for each file name

example:

0-policy001_Printedlabel.pdf
1-policy002_Printedlabel.pdf
2-policy003_Printedlabel.pdf
3-policy004_Printedlabel.pdf

Now I want to use Linq to extract an array out of the above array , which gives me only

policy001,policy002,policy003,policy004

Can you please help me? I am new to lambda expression.

@DanielMann I think the first section is what he has tried but obviously that's not clear enough due to formatting. — LukeHennerley
– LukeHennerley, Commented Dec 14, 2012 at 15:56
Is the 0-, 1- and so on, part of the filename, or just an index? — Hans Keﬆing
– Hans Keﬆing, Commented Dec 14, 2012 at 16:00

Justin Harvey · Accepted Answer · 2012-12-14 15:59:00Z

4

List<string> output = fileList.Select(fileName => fileName.Split(new char[] {'-','_'})[1]).ToList()

answered Dec 14, 2012 at 15:59

Justin Harvey

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1 Comment

LukeHennerley Over a year ago

+1 for the answer, was going to change my answer after I understood what was being asked for haha.

Adriano Carneiro · Accepted Answer · 2012-12-14 16:27:07Z

4

Regex regex = new Regex(@".+(policy[0-9]+).+");

var newarray = yourarray.Select(d=>regex.Match(d))
                        .Where (mc => mc.Success)
                        .Select(mc => mc.Groups[1].Value)
                        .ToArray();

edited Dec 14, 2012 at 16:27

answered Dec 14, 2012 at 15:58

Adriano Carneiro

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Comments

LukeHennerley · Accepted Answer · 2012-12-14 16:03:58Z

1

If the numbers are indexes

string[] output = fileList.Select(fileName => fileName.Split(new char[] {'_'})[0]).ToArray();

If the numbers are part of the file name

string[] output = fileList.Select(fileName => fileName.Split(new char[] {'-', '_'})[1]).ToArray();

edited Dec 14, 2012 at 16:03

answered Dec 14, 2012 at 15:56

LukeHennerley

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2 Comments

Justin Harvey Over a year ago

That will return the number at the start too

LukeHennerley Over a year ago

@JustinHarvey I see the formatting of the question made me think that the numbers represented the indexes...

Tim Schmelter · Accepted Answer · 2012-12-14 16:07:31Z

0

If it's always so strict:

string[] result = list
    .Select(fn => Path.GetFileNameWithoutExtension(fn)
                      .Split(new[] { '-', '_' }, StringSplitOptions.None)
                      .ElementAtOrDefault(1))
    .ToArray();

answered Dec 14, 2012 at 16:07

Tim Schmelter

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