/// <summary>
/// Try to open a file for exclusive read/write access
/// </summary>
/// <param name="filename">Path to file</param>
/// <returns>A <see cref="Stream"/> for the opened file, or <see langword="null"/> on failure to open the file.</returns>
public static Stream FileOpenExclusive(string filename)
{
for (int attempts = 0; attempts < 10; ++attempts)
{
try {
return(File.Open(filename, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None));
} catch (IOException e) {
_log.TraceExceptionMethodCall(e, "FileOpenExclusive", filename, attempts);
} catch (UnauthorizedAccessException e) {
_log.TraceExceptionMethodCall(e, "FileOpenExclusive", filename, attempts);
}
AsyncUtil.Sleep(((attempts + 1) * Randomizer.Next(100)).Milliseconds());
}
return(null);
}
