How to use Automapper with Autofac

Question

I've upgraded to the latest version of AutoMapper (9.0) and I've changed the static configuration to:

public static IMapper RegisterAutoMapper()
{
    var config = new MapperConfiguration(cfg =>
    {
        cfg.CreateMap<MyModel MyDto>;
        //etc...
   });
  
   var mapper = config.CreateMapper();
   return mapper;
}

Using the previous static API I used to do the following in Global.asax:

protected void Application_Start()
{
    GlobalConfiguration.Configure(WebApiConfig.Register);
    AutoMapping.Map();
}

WebApiConfig.Register registers the routes and also Autofac

How do I register AutoMapper with Autofac because currently I'm getting compiler errors on such lines:

var myDto = Mapper.Map<MyModel>(model);

And the compiler error:

An object reference is required for the non-static field, method, or property 'Mapper.Map(object)'

Answer 1

Here's one I made earlier:

public class YourAutofacModule : Module
{
    protected override void Load(ContainerBuilder builder)
    {
        //Also register any custom type converter/value resolvers
        builder.RegisterType<CustomValueResolver>().AsSelf();
        builder.RegisterType<CustomTypeConverter>().AsSelf();

        builder.Register(context => new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<MyModel MyDto>;
            //etc...
        })).AsSelf().SingleInstance();

        builder.Register(c =>
        {
            //This resolves a new context that can be used later.
            var context = c.Resolve<IComponentContext>();
            var config = context.Resolve<MapperConfiguration>();
            return config.CreateMapper(context.Resolve);
        })
        .As<IMapper>()
        .InstancePerLifetimeScope();
    }
}

In the global.asax.cs

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        var builder = new ContainerBuilder();

        builder.RegisterModule<MyAutofacModule>();
        // Register anything else needed

        var container = builder.Build();

        // MVC resolver
        DependencyResolver.SetResolver(new AutofacDependencyResolver(container));

        // API Resolver
        GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependencyResolver(container);
    }
}

Then all you need to do is inject IMapper