Counting Files Extensions C#

Question

Hi i'm a c# begginer and i'd like to do a simple program which is going to go through a folder and count how many files are .mp3 files and how many are .flac .

Like I said the program is very basic. It will ask for the music folder path and will then go through it. I know there will be a lot of subfolders in that main music folder so it will have to open them one at the time and go through them too.

E.g

C:/Music/ will be the given directory. But it doesn't contain any music in itself. To get to the music files the program would have to open subfolders like

C:/Music/Electronic/deadmau5/RandomAlbumTitle/ Only then he can count the .mp3 files and .flac files and store them in two separated counters. The program will have to do that for at least 2000 folders.

Do you know a good way or method to go through files and return its name (and extension)?

Answer 1

You can use System.IO.DirectoryInfo. DirectoryInfo provides a GetFiles method, which also has a recursive option, so if you're not worried about speed, you can do this:

DirectoryInfo di = new DirectoryInfo(@"C:\Music");

int numMP3 = di.GetFiles("*.mp3", SearchOption.AllDirectories).Length;
int numFLAC = di.GetFiles("*.flac", SearchOption.AllDirectories).Length;

Answer 2

Use DirectoryInfo and a grouping by the file extension:

var di = new DirectoryInfo(@"C:/Music/");
var extensionCounts = di.EnumerateFiles("*.*", SearchOption.AllDirectories)
                        .GroupBy(x => x.Extension)
                        .Select(g => new { Extension = g.Key, Count = g.Count() })
                        .ToList();

foreach (var group in extensionCounts)
{
    Console.WriteLine("There are {0} files with extension {1}", group.Count, 
                                                                group.Extension);
}