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Asked: 2026-05-10T21:32:27+00:00

I’m trying to use System.IO.File.Replace to update a file, and it’s throwing System.IOException if

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I’m trying to use System.IO.File.Replace to update a file, and it’s throwing System.IOException if the destination file is on a NAS.

According to MSDN, if the destination file is on a different volume, this method throws an exception. It’s right, but how do I detect if two files are on ‘different volumes’?

Path.GetPathRoot returns different strings if I specify the same file using drive letters, mapped drives, or UNC paths. I can’t catch System.IOException because that is thrown in a variety of cases, not just if the files are on different volumes.

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1 Answer

  1. You could ensure the replace is always on the same volume by using Copy, then Replace. Or just catch the error and try it.

    catch IOException   File.Copy( src,dest+'.tmp', true )  File.Replace( dest+'.tmp', dest, dest_backup )
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