// @nuget: CommandLineParser -Version 2.6.0

//MapResult async

using System;

using System.Collections.Generic;

using System.Threading.Tasks;

using CommandLine;

​

public class Program

{

    public static async Task Main()

    {

        var args = "--userid=root -t int:long:string".Split();

        var result =  Parser.Default.ParseArguments<Options>(args)

            .MapResult(RunAndReturnExitCodeAsync,

                       _ => Task.FromResult(1));

        Console.WriteLine($"retCode={result.Result}");

    }

​

    //Should be Task<T>, for MapResult

    static async Task<int> RunAndReturnExitCodeAsync(Options options)

    {

        Console.WriteLine("Starting async/await method");

        Console.WriteLine("A");     

        await Task.Delay(100);      

        Console.WriteLine("B");

        await Task.Delay(100);

        Console.WriteLine("C");

        Console.WriteLine($"UserId={options.UserId}");

        return 0;

    }

}

​

class Options

{

    [Option]

    public string UserId

    {

        get;

        set;

    }

​

    [Option('t', Separator = ':')]

    public IEnumerable<string> Types

    {

        get;

        set;

    }

}