using Autofac;

using System;

public class Program

{

    private static IContainer Container { get; set; }

    public static void Main()

    {

        var builder = new ContainerBuilder();

        builder.RegisterType<MyService1>();         // Lazily constructed

        builder.Register(_ => new MyService2());    // Lazily constructed

        builder.RegisterInstance(new MyService3()); // Eagerly constructed

        Container = builder.Build(); // Writes "MyService3 constructed" to console

    }

}

​

public class MyService1

{

    public MyService1()

    {

        Console.WriteLine($"{nameof(MyService1)} constructed.");

    }

}

​

public class MyService2

{

    public MyService2()

    {

        Console.WriteLine($"{nameof(MyService2)} constructed.");

    }

}

​

public class MyService3

{

    public MyService3()

    {

        Console.WriteLine($"{nameof(MyService3)} constructed.");

    }

}

​