using System;

using System.CommandLine;

using System.CommandLine.Invocation;

​

public class Program

{

    #nullable enable

    public static void Main(string[] args)

    {

        var rootCommand = new RootCommand{new Option<string?>("--myoption", () => null)};

        rootCommand.Handler = CommandHandler.Create<string?>(Run);

        rootCommand.Invoke(args);

    }

​

    private static void Run(string? myoption)

    {

        Console.WriteLine(myoption == null ? "(null)" : '"' + myoption + '"');

    }

    #nullable disable

}