// @nuget: CommandLineParser -Version 2.7.82

using System;

using System.Collections.Generic;

using CommandLine;

using CommandLine.Text;

using System.IO;

​

public class Program

{

    public static void Main()

    {

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

        var options = new Options{P2 = @"C:\my long whitespace path\file space.txt", P1 = 99, P3 = 88, Start = DateTime.Now, Size = 0, P4 = new FileInfo(@"C:\my long whitespace path\file space.txt"), P5 = new DirectoryInfo(@"C:\my long\whitespace path\")};

        //skip default values

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

        Console.WriteLine(args);

    }

}

​

class Options

{

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

    public int P1

    {

        get;

        set;

    }

​

    [Option()]

    public string P2

    {

        get;

        set;

    }

    [Option()]

    public FileInfo P4

    {

        get;

        set;

    }

    [Option()]

    public DirectoryInfo P5

    {

        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;

    }

}