If you check that the file is available, but then try and use it you could throw at that point, which a malicious user could use to force and exploit in your code.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | protected virtual bool IsFileLocked(FileInfo file) { try { using(FileStream stream = file.Open(FileMode.Open, FileAccess.Read, FileShare.None)) { stream.Close(); } } catch (IOException) { //the file is unavailable because it is: //still being written to //or being processed by another thread //or does not exist (has already been processed) return true; } //file is not locked return false; } |
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