Count specific files from folder

Question

private void button1_Click(object sender, EventArgs e) { DialogResult result = folderBrowserDialog1.ShowDialog(); if (result == DialogResult.OK) { string[] files = Directory.GetFiles(folderBrowserDialog1.SelectedPath); MessageBox.Show("Files found: " + files.Length.ToString(), "Message"); } }

This counts number of files in folder. But I need count for only specific files which are in folder such a .txt or .mp3

possible duplicate of Find a file with a certain extension in folder — cbr
– cbr, Commented Apr 20, 2015 at 14:42
If you prefix your code with 4 spaces, it will format nicely. — Rick
– Rick, Commented Apr 20, 2015 at 14:42

Dominic Scanlan · Accepted Answer · 2015-04-20 14:46:05Z

1

DirectoryInfo di = new DirectoryInfo(@"C:/temp"); di.GetFiles("test?.txt").Length;

or

di.GetFiles("*.txt").Length;

answered Apr 20, 2015 at 14:46

Dominic Scanlan

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Comments

Jonesopolis · Accepted Answer · 2015-04-20 14:48:08Z

1

Check if the files' extensions are in your specified collection:

 var validExts = new []{".txt", ".mp3"}; string[] files = Directory.GetFiles(folderBrowserDialog1.SelectedPath) .Where(f => validExts.Contains(Path.GetExtension(f))) .ToArray();

answered Apr 20, 2015 at 14:48

Jonesopolis

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2 Comments

Dmitrii Bychenko Over a year ago

HashSet<String> for validExts instead of String[] IMHO looks better.

Jonesopolis Over a year ago

sure that's better. But the change is probably insignificant on this scale.

Dmitrii Bychenko · Accepted Answer · 2015-04-20 14:49:52Z

Just union the different extensions:

String[] files = Directory.GetFiles(folderBrowserDialog1.SelectedPath, "*.txt") .Union(Directory.GetFiles(folderBrowserDialog1.SelectedPath, "*.mp3")) .ToArray();

you can chain as many Union as you want. In case you just want to count the files you don't have to use any array:

private void button1_Click(object sender, EventArgs e) { if (folderBrowserDialog1.ShowDialog() == DialogResult.OK) MessageBox.Show(Directory.GetFiles(folderBrowserDialog1.SelectedPath, "*.txt") .Union(Directory.GetFiles(folderBrowserDialog1.SelectedPath, "*.mp3")) .Count(), "Message") }

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