Getting started, getting stuck

Trying out this library with a toy example:

using CommandLine;
using System;

namespace Test_CommandArgs
{
    class Options
    {
        [Option('a', "optiona", Required = true, HelpText = "Option A")]
        string a {get; set;}
    }

    class Program
    {
        static void Main(string[] args)
        {
            var results = CommandLine.Parser.Default.ParseArguments<Options>(new string[] {});
            Console.WriteLine(results.Tag);
            Console.WriteLine(results.);
        }
    }
}

For the last line, I was hoping that VS would show me an attribute that I’d expect to hold a reference to the options object, but I can’t see it:

What am I doing wrong? How do I get that reference?

[gbritton1]

Hmmm. Pity it doesn’t expose the parsed value directly, say in a ParserResult.Value property. This means an awkward (to me) workaround like:

  class Program
   {
       static void Main(string[] args)
       {
           var results = CommandLine.Parser.Default.ParseArguments<Options>(args);
           results.WithParsed(o => RealMain(o));
           results.WithNotParsed(e =>  
               {
                   foreach(var i in e) Console.WriteLine("Error: " + i); 
                   throw new ArgumentException("Invalid Argument(s).");
               });
       }
       static void RealMain(Options o)
       {
           // Now we really start.
       }
   }
}

Also, both approaches are at odds with the example code which looks very nice https://archive.codeplex.com/?p=commandline

[ericnewton76]

If the quickstart example could be improved for a user that isnt familiar with the library, a pull request would be welcome and thanks in order.