cli-ninject-hosting/CustomHostingDemo/HelloCommand.cs

using Ninject.Syntax;
using System;
using System.Collections.Generic;
using System.CommandLine;
using System.CommandLine.Invocation;
using System.CommandLine.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CustomHostingDemo
{
    public class HelloCommand : Command
    {
        public HelloCommand()
            : base("hello", "says hello")
        {
            Handler = CommandHandler.Create(typeof(DefaultHandler).GetMethod(nameof(ICommandHandler.InvokeAsync)));
            AddArgument(new Argument<DateTime>("date", () => DateTime.Today));
            AddOption(new Option<bool>("--verbose"));
        }

        public class HelloArgs
        {
            public DateTime Date { get; set; }
            public bool Verbose { get; set; }
        }

        public class DefaultHandler : ICommandHandler
        {
            private readonly HelloArgs _args;
            private readonly IResolutionRoot _resolutionRoot;

            public DefaultHandler(HelloArgs args, IResolutionRoot resolutionRoot)
            {
                _args = args;
                _resolutionRoot = resolutionRoot;
            }

            public Task<int> InvokeAsync(InvocationContext context)
            {
                context.Console.Out.WriteLine("Hello YOU!");
                context.Console.Out.WriteLine($"P: --date {_args.Date}");
                context.Console.Out.WriteLine($"P: --verbose {_args.Verbose}");

                return Task.FromResult(0);
            }
        }
    }
}