// @nuget: CommandLineParser -Version 2.8.0

using System;

using System.Collections.Generic;

using CommandLine;

using CommandLine.Text;

​

public class Program

{

    public static void Main()

    {

        var args = "--help".Split();

        //var args = "--version".Split();

        UseCase(args);

    }

​

    static int UseCase(string[] args)

    {

        var parser = new CommandLine.Parser(with => with.HelpWriter = null);

        var parserResult = parser.ParseArguments<Options>(args);

        return parserResult.MapResult(

            (Options options) => Run(options), 

            errs => DisplayHelp<Options>(parserResult));

    }

​

    static int DisplayHelp<T>(ParserResult<T> result)

    {        

        var helpText = HelpText.AutoBuild(result, h =>

        {

            //configure help

            h.AdditionalNewLineAfterOption = false;

            h.Heading = "Myapp 2.0.0-beta"; //change header

            h.Copyright = "Copyright (c) 2019 Global.com"; //change copyrigt text

            return h;

        });

        Console.WriteLine(helpText);

        return 1;

    }

​

    static int Run(Options options)

    {

        //do stuff     

        return 0;

    }

}

​

class Options

{

    [Option('r', "read", Required = false, HelpText = "Input files to be processed.")]

    public IEnumerable<string> InputFiles

    {

        get;

        set;

    }

​

    [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;

    }

}