/// <summary>
/// Writes the input rotor count to the file.
/// </summary>
/// <param name="rotorKeys">The new number of rotors to save.</param>
/// <param name="rotorKeysFile">The rotor count file to save the count to.</param>
private void SaveToFile(RotorKeys rotorKeys, string rotorKeysFile)
{
Directory.CreateDirectory(Path.GetDirectoryName(rotorKeysFile));
RotorIO.Write(rotorKeys, rotorKeysFile);
}