MapResult Usage with async methods

I’m using it CommandLineParser from and async Task Main method.

I would like to use verbs, so I would use the recommended syntax:

CommandLine.Parser.Default.ParseArguments<Options1, Options2, Options3>(args)
	.MapResult(
	  (Options1opts) => Method1(opts),
	  (Options2opts) => Method2(opts),
	  (Options3opts) => Method2(opts),
	  errs => 1);

But in my case, the methods are async. Howo do I use the MapResult in this scenario? The same problem occurs with the WithParsed methods.

Thanks!

[nemec]

@shravan2x I’m not sure I understand. OP’s methods return tasks already so there’s no issue. Here is a full example of what I’m talking about.

async Task Main()
{
	var args = "a --name tim".Split();
	await CommandLine.Parser.Default.ParseArguments<Options1, Options2, Options3>(args)
		.MapResult(
	  (Options1 opts) => Method1(opts),
	  (Options2 opts) => Method2(opts),
	  (Options3 opts) => Method3(opts),
	  errs => Task.FromResult(0));
}

public async Task<int> Method1(Options1 opt)
{
	Console.WriteLine("Method1 " + opt.Name);
	await Task.Delay(TimeSpan.FromSeconds(1));
	return 1;
}

public async Task<int> Method2(Options2 opt)
{
	Console.WriteLine("Method2");
	await Task.Delay(TimeSpan.FromSeconds(1));
	return 2;
}

public async Task<int> Method3(Options3 opt)
{
	Console.WriteLine("Method3");
	await Task.Delay(TimeSpan.FromSeconds(1));
	return 3;
}

[Verb("a")]
public class Options1
{
	[Option('n', "name")]
	public string Name { get; set; }
}

[Verb("b")]
public class Options2
{
}

[Verb("c")]
public class Options3 
{
}

[SuperJMN]

Thanks for the info! Now I know how to proceed 😃