How do i...how to append a number in to a file name and make it unique?

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Hi,

I have to copy some .txt files in to a different location.But the issue is i am unable to paste those files due to same name.I am getting those .txt files from different folder.I need to append a number to make .txt file unique and paste in to different location.My current code doesnt allow this.How can i do this?

What I have tried:

C#

foreach (var file in

      Directory.EnumerateFiles(extractPathForCurrentZip, "*.txt"))

                      {

 
                         File.Copy(file, DestinationFoldername+ Path.GetFileName(file));

}

Posted 18-Apr-22 21:33pm

Manidas Payyoli

Updated 18-Apr-22 21:42pm

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Richard MacCutchan 19-Apr-22 3:35am

You need to separate the filename and extension and modify the filename part to make it unique.

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OriginalGriff · Accepted Answer · 2022-04-18T21:42:00

The only way to do that is to fetch all the files, find the largest number at the end, add one to it, and then try to save that file - the sway that Windows does when you paste a file with the same name.
I'd add a separator to the file name - myFile.0000.txt, myFile.0001.txt, ... and so on to make it easier to separate the number part with a Regex.

I'd also suggest you use Path.Combine instead of concatenating strings (as it sorts out "\" separators for you) and use a try...catch block to detect overwrite attempts - remember that Windows can do several things at a time, so the "free number" you tried may not be free by the time you actually copy the file.