Class1.cs

using System;

class Options
{
    [Option('r', "read", Required = true, HelpText = "Input files to be processed.")]
    public IEnumerable<string> InputFiles { get; set; }

    // Omitting long name, defaults to name of property, ie "--verbose"
    [Option(
        Default = false,
        HelpText = "Prints all messages to standard output.")]
    public bool Verbose { get; set; }

    [Option("stdin",
        Default = false,
        HelpText = "Read from stdin")]
    public bool stdin { get; set; }

    [Value(0, MetaName = "offset", HelpText = "File offset.")]
    public long? Offset { get; set; }
}


public class Class1
{
	public Class1()
	{
        static void Main(string[] args)
        {
            CommandLine.Parser.Default.ParseArguments<Options>(args)
                .WithParsed<Options>(opts => RunOptionsAndReturnExitCode(opts))
                .WithNotParsed<Options>((errs) => HandleParseError(errs));
        }
    }
}