How do I de-capitalize all file extensions given a directory?

Question

    originalFiles = Directory.GetFiles(fbFolderBrowser.SelectedPath).Where(file => !file.EndsWith(".db")).ToArray();

foreach (string file in originalFiles)
    {
         File.Move(file, file.Replace(".JPG", ".jpg"));
         File.Move(file, file.Replace(".TIFF", ".tiff"));
         File.Move(file, file.Replace(".JPEG", ".jpeg"));
         File.Move(file, file.Replace(".BMP", ".bmp"));
         File.Move(file, file.Replace(".GIF", ".gif"));
    }

I thought running the above would change the file extensions to lower case.

I have files in the directory:

AAA_1.jpg
AAA_2.JPG
BBB_1.TIFF
BBB_2.GIF

I want it to to be:

AAA_1.jpg
AAA_2.jpg
BBB_1.tiff
BBB_2.gif

How would I go about doing this?

Here is a similar question: [Change File Extension](http://stackoverflow.com/questions/5259961/change-) That should take care of your problem — CSharpDev, Aug 22 '12 at 20:41

Robert Harvey · Accepted Answer · 2012-08-22T21:52:26.380

Use the ToLower() method of the String class, and the ChangeExtension() method of the Path class. This should allow you to lowercase all of the extensions without having to enumerate every possible extension.

DirectoryInfo folder = new DirectoryInfo("c:\whatever");
FileInfo[] files = dirInfo.GetFiles("*.*");


foreach (var file in files)
{
    File.Move(file.FullName, Path.ChangeExtension(file, 
       Path.GetExtension(file).ToLower()));     
}

score -1 · Answer 2 · edited Jan 15 '20 at 17:24

-1

I got it. Thanks for the tip Robert.

foreach (string file in originalFiles)
{
  File.Move(file, Path.ChangeExtension(file, Path.GetExtension(file).ToLower()));
}

edited Jan 15 '20 at 17:24

Dan Atkinson

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answered Aug 22 '12 at 20:52

JJ.

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How do I de-capitalize all file extensions given a directory?

2 Answers2