using System;

using System.CommandLine;

using System.CommandLine.Invocation;

​

public class Program

{

    public static void Main(string[] args)

    {

        //as far as I know, we can't pass in args in .NET fiddle

        //usage will say that to use the Foo Command, it will look like applicationName [options] Foo <bar>

        //but if I put the Foo options before the Foo command you get an "unrecognized command or argument '--gar'

        args = new string[]{"--gar", "hello gar", "Foo", "hello bar"};

        //if you put the Foo options after the <bar> argument, then things work

        args = new string[]{"Foo", "hello bar", "--gar", "hello gar"};

        var rootCommand = new RootCommand

        {

            new FooCommand()

        };

        rootCommand.Description = "I am root.";

        rootCommand.Invoke(args);

    }

​

    private class FooCommand : Command

    {

        public FooCommand(): base("Foo", "Executes the foo command.")

        {

            Handler = CommandHandler.Create<string, string>((bar, gar) => doFoo(bar, gar));

            var barArgument = new Argument<string>("bar", "The bar argument");

            var garOption = new Option<string>("--gar", () => "default gar", "The gar option");

            AddArgument(barArgument);

            AddOption(garOption);

        }

        private void doFoo(string bar, string gar)

        {

            Console.WriteLine($"bar: {bar}    gar: {gar}");

        }

    }

}

​