AutoFacSamples/AutoFacSamles/Program.cs

using Autofac;
using Autofac.Core;
using System;
using System.Collections.Generic;

namespace AutoFacSamles
{
    public interface ILog
    {
        void Write(string message);
    }

    public class ConsoleLog : ILog
    {
        public void Write(string message)
        {
            Console.WriteLine(message);
        }
    }

    public class EmailLog : ILog
    {
        private const string adminEmail = "tfoman@oeman.se";
        public void Write(string message)
        {
            Console.WriteLine($"Email sent to {adminEmail} : {message}");
        }
    }

    public class Engine
    {
        private ILog log;
        private int id;

        public Engine(ILog log, int id)
        {
            this.log = log;
            this.id = id;
        }

        public Engine(ILog log)
        {
            this.log = log;
            id = new Random().Next();
        }

        public void Ahead(int power)
        {
            log.Write($"Engine [{id}] ahead {power}");
        }
    }

    public class SMSLog : ILog
    {
        private readonly string phoneNumber;

        public SMSLog(string phoneNumber)
        {
            this.phoneNumber = phoneNumber;
        }
        public void Write(string message)
        {
            Console.WriteLine($"SMS to {phoneNumber} : {message}");
        }
    }

    public class Car
    {
        private Engine engine;
        private ILog log;

        public Car(Engine engine)
        {
            this.engine = engine;
            this.log = new EmailLog();
        }

        public Car(Engine engine, ILog log)
        {
            this.engine = engine;
            this.log = log;
        }

        public void Go()
        {
            engine.Ahead(100);
            log.Write("Car going forward...");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var builder = new ContainerBuilder();

            // Named parameter
            //builder.RegisterType<SMSLog>()
            //    .As<ILog>()
            //    .WithParameter("phoneNumber", "+173874872643");

            // Typed parameter
            //builder.RegisterType<SMSLog>()
            //    .As<ILog>()
            //    .WithParameter(new TypedParameter(typeof(string), "+173874872643"));

            // resolved parameter
            //builder.RegisterType<SMSLog>()
            //    .As<ILog>()
            //    .WithParameter(
            //   new ResolvedParameter(
            //       // predicate
            //       (pi, ctx) => pi.ParameterType == typeof(string) && pi.Name == "phoneNumber",
            //       (pi, ctx) => "+173874872643"
            //       )
            //    );

            Random random = new Random();
            builder.Register((c, p) => new SMSLog(p.Named<string>("phoneNumber")))
                .As<ILog>();
            Console.WriteLine("About to build container ...");
            var container = builder.Build();

            var log = container.Resolve<ILog>(new NamedParameter("phoneNumber", random.Next().ToString()));
            log.Write("Testing");

        }
    }
}