// @nuget: CommandLineParser -Version 2.5.0

​

​

using System;

using System.Collections.Generic;

using CommandLine;

using CommandLine.Text;

using System.Linq;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {   

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

        Main1(args);

   }

     static void Main1(string[] args)

                {

                    //INCORRECTLY generates double ERROR line   

                    var parser = Parser.Default;

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

                    parserResult.WithParsed<Options>(options => Run(options));

                 }

    private static int Run(Options options)

    {

           //do stuff

            Console.WriteLine("parser SUCCESS- provide your custome help/version");

            return 0;

    }

}

​

class Options

{

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

  public bool Read { get; set; }

​

​

}