ArcToolkitCLI/ArcToolkitCLI/Program.cs

using System.Linq;
using ArcToolkitCLI.Commands;
using CommandLine;

namespace ArcToolkitCLI
{
    internal class Program
    {
        private static int Main(string[] args)
        {
            var commandTypes = typeof(Program).Assembly.GetTypes()
                                              .Where(t => !t.IsInterface && !t.IsAbstract &&
                                                          typeof(ICommand).IsAssignableFrom(t)).ToArray();
            return new Parser(with =>
            {
                with.IgnoreUnknownArguments = true;
                with.AutoHelp = true;
                with.HelpWriter = Parser.Default.Settings.HelpWriter;
            }).ParseArguments(args, commandTypes).MapResult((object t) => ((ICommand)t).Run(), errs => 1);
        }
    }
}