Command Line Parser, verbs GetUsage.

cmdline-snippet-5.cs

class Options : CommandLineOptionsBase
{
  // option attributes as above...
  [HelpVerbOption]
  public string GetUsage(string verb)
  {
    bool found;
    var instance = (CommandLineOptionsBase) CommandLineParser.GetVerbOptionsInstanceByName(verb, this, out found);
    var verbsIndex = verb == null || !found;
    var target = verbsIndex ? this : instance;
    return HelpText.AutoBuild(target, current => HelpText.DefaultParsingErrorsHandler(target, current), verbsIndex);
  }
}