using System;

using Autofac;

​

namespace StackOverflow42744319

{

    public class Program

    {

        public static void Main(string[] args)

        {

            var builder = new ContainerBuilder();

​

            builder.RegisterType<MyContext>().AsSelf().AsImplementedInterfaces();

            builder.RegisterType<DbContextFactory<MyContext>>().As<IDbContextFactory<IContext>>();

            builder.RegisterType<Foo>().AsSelf();

​

            var container = builder.Build();

​

            var instance1 = container.Resolve<Foo>();

            var instance2 = container.Resolve<Foo>();

​

            instance1.Bar();

            instance2.Bar();

​

            Console.ReadLine();

        }

    }

​

    public interface IContext

    {

        Guid Guid { get; }

    }

​

    public class MyContext : IContext

    {

        public Guid Guid { get; private set; }

​

        public MyContext()

        {

            Guid = Guid.NewGuid();

        }

    }

​

    public class Foo

    {

        private readonly IDbContextFactory<IContext> _contextFactory;

​

        public Foo(IDbContextFactory<IContext> contextFactory)

        {

            _contextFactory = contextFactory;

        }

​

        public void Bar()

        {

            var context = _contextFactory.Create();

            Console.WriteLine(context.Guid);

            Console.WriteLine(context.GetHashCode());

        }

    }

​

    public interface IDbContextFactory<out TContext>

            where TContext : IContext

    {

        TContext Create();

    }

​

    public class DbContextFactory<TContext> : IDbContextFactory<TContext>

        where TContext : IContext

    {

        private readonly Func<TContext> _contextCreator;

​

        public DbContextFactory(Func<TContext> contextCreator)

        {

            _contextCreator = contextCreator;

        }

​

        public TContext Create()

        {

            return _contextCreator();

        }

    }

}

​