Display A Help Screen

Mapping a method with HelpOptionAttribute will allow the parser to display a help screen when parsing rule are violated.

class Options
{
  [Option("p", "person-to-greet", Required=true, HelpText="The person to greet.")]
  public string PersonToGreet { get; set; }

  [HelpOption]
  public string GetUsage()
  {
    return "Please read user manual!" + Environment.NewLine;
  }
}

In this sample the -p|--person-to-great option is mandatory. Omitting it will cause the parser to display the string returned by Options::GetUsage().

[TO BE COMPLETED...]