// @nuget: CommandLineParser -Version 2.7.82

using System;

using System.Collections.Generic;

using CommandLine;

using System.Linq;

​

​

public class Program

{

    public static void Main()

    {

        var text = " --copy-agg false";

        var args = text.Split();

        var result = CommandLine.Parser.Default.ParseArguments<Options>(args).MapResult((opts) => RunOptionsAndReturnExitCode(opts), //in case parser sucess

 errs => HandleParseError(errs)); //in  case parser fail

        Console.WriteLine("Return code= {0}", result);

    }

​

    //3)    //In sucess: the main logic to handle the options

    static int RunOptionsAndReturnExitCode(Options o)

    {

        Console.WriteLine("Success");

        var exitCode = 0;

​

        Console.WriteLine("Copy= {0}", o.Copy);

        return exitCode;

    }

​

    //in case of errors or --help or --version

    static int HandleParseError(IEnumerable<Error> errs)

    {

        var result = -2;

        Console.WriteLine("errors {0}", errs.Count());

        if (errs.Any(x => x is HelpRequestedError || x is VersionRequestedError))

            result = -1;

        Console.WriteLine("Exit code {0}", result);

        return result;

    }

}

​

class Options

{   

    [Option(longName:"copy-agg", Required = true)]

    public bool Copy {get; set;}

}