C# Sorting Directory.GetFiles() by name without extension

Question

I'm trying to obtaint a sorted list of the files inside a directory. This files have differentes extensions.

foreach (String File in Directory.GetFiles(directory, "*").OrderBy(f => f))
{
 stringA[i] = File;
 i++;
}

The problem is that the result is not sorted like I expected. This is what I obtein in "stringA":

1.txt
10.txt
11.png
12.png
18.png
19.txt
2.txt
21.png
22.png
23.png
24.png
25.txt
26.txt
27.txt
28.txt
29.txt
3.png
30.txt
31.txt
32..png
33..png
34..png
35.png
4.txt
40.txt
41.png etc

What I want is : 1.txt, 2.txt, 3.png, 4.txt, 5.png, 6.txt, 7, 8, 9, 10 , 11, 19, 20, 21, 29, 30...

What can I do?

please tag the technology u are using. like java c# or any one else ?? — Vikrant Kashyap
– Vikrant Kashyap, Commented Apr 2, 2016 at 14:50

nvoigt · Accepted Answer · 2016-04-02 15:59:04Z

2

var files = Directory.GetFiles(directory, "*")
         .Select(file => new { FileName = file, FileNumber = long.Parse(Path.GetFileNameWithoutExtension(file))  })
         .OrderBy(data => data.FileNumber);

foreach( file in files )
{
   Console.WriteLine("{0} (Number: {1})", file.FileName, FileNumber)
}

Please note that this omits any error handling you may need.

answered Apr 2, 2016 at 15:59

nvoigt

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Comments

Stokke · Accepted Answer · 2016-04-02 16:08:54Z

0

This is called alphanumeric sorting. For custom sorting in general, implement the IComparer interface with a custom compare method that suits your need.

For alphanumeric, Dotnetpearls has an excellent example and implementation here: http://www.dotnetperls.com/alphanumeric-sorting.

Copy the AlphanumComparatorFast class, then use it like this:

        var list = Directory.GetFiles(directory);
        Array.Sort(list, new AlphanumComparatorFast());

edited Apr 2, 2016 at 16:08

answered Apr 2, 2016 at 15:34

Stokke

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1 Comment

Stokke Over a year ago

Happy to help. If you don't mind, please remember to hit the check mark to the left of the answer to accept it ;-).

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