spectre.console/examples/Cli/Injection/Program.cs

using Injection.Commands;
using Microsoft.Extensions.DependencyInjection;
using Spectre.Console.Cli;

namespace Injection
{
    public class Program
    {
        public static int Main(string[] args)
        {
            // Create a type registrar and register any dependencies.
            // A type registrar is an adapter for a DI framework.
            var registrations = new ServiceCollection();
            registrations.AddSingleton<IGreeter, HelloWorldGreeter>();
            var registrar = new TypeRegistrar(registrations);

            // Create a new command app with the registrar
            // and run it with the provided arguments.
            var app = new CommandApp<DefaultCommand>(registrar);
            return app.Run(args);
        }
    }
}