// @nuget: CommandLineParser -Version 2.9.0-preview1

using System;

using System.Collections.Generic;

using CommandLine;

using CommandLine.Text;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("UnParsing Demo to show nullable int and DateTime format in v2.7+");

        var options = new Options{P2 = "xyz", P1 = 99, P3 = 88, Start = DateTime.Now, Size = 0};

        Console.WriteLine($"Original values: P1={options.P1} | P2= {options.P2} | P3= {options.P3} | Start= {options.Start} | Size= {options.Size} ");

        //skip default values

        string args = CommandLine.Parser.Default.FormatCommandLine(options, config => config.SkipDefault = true);

        Console.WriteLine(args);

        //get args as array of strings using FormatCommandLineArgs, V2.9+

        string[] argsArray = CommandLine.Parser.Default.FormatCommandLineArgs(options, config => config.SkipDefault = true);

        var i = 0;

        foreach (var arg in argsArray)

        {

            Console.WriteLine($"Args[{i++}]: {arg}");

        }

        //round trip options ->args -> options by parsing

        //parse the generated args and get Options again

        Options result = Parser.Default.ParseArguments<Options>(argsArray).Value;

        Console.WriteLine($"Parsed values: P1={result.P1} | P2= {result.P2} | P3= {result.P3} | Start= {result.Start} | Size= {result.Size} ");

    }

}

​

class Options

{

    [Option(Default = 99)] //should be skipped when P1=99

    public int P1

    {

        get;

        set;

    }

​

    [Option()]

    public string P2

    {

        get;

        set;

    }

​

    [Option(Default = 88)] //should be skipped when P3=88

    public int P3

    {

        get;

        set;

    }

​

    [Option(longName: "start", HelpText = "Start Date")]

    public DateTime? Start

    {

        get;

        set;

    }

//nullable, default=null

    [Option()]

    public int? Size  //should be displayed when Size=0

    {

        get;

        set;

    }

}