How do I properly register AutoFac in a basic MVC5.1 website?

Question

AutoFac has recently been updated for MVC 5.1 but at the time of writing I find that the documentation is lacking (especially for a simple example).

I would like to inje

Answer 1

Here's what I have - feedback welcome!

Global.asax.cs:

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        // Register Inversion of Control dependencies
        IoCConfig.RegisterDependencies();

        // Typical MVC setup
        // ....
    }
}

App_Start folder:

public class IoCConfig
{

    /// <summary>
    /// For more info see 
    /// :https://code.google.com/p/autofac/wiki/MvcIntegration (mvc4 instructions)
    /// </summary>
    public static void RegisterDependencies()
    {
        #region Create the builder
        var builder = new ContainerBuilder();
        #endregion

        #region Setup a common pattern
        // placed here before RegisterControllers as last one wins
        builder.RegisterAssemblyTypes()
               .Where(t => t.Name.EndsWith("Repository"))
               .AsImplementedInterfaces()
               .InstancePerHttpRequest();
        builder.RegisterAssemblyTypes()
               .Where(t => t.Name.EndsWith("Service"))
               .AsImplementedInterfaces()
               .InstancePerHttpRequest();
        #endregion

        #region Register all controllers for the assembly
        // Note that ASP.NET MVC requests controllers by their concrete types, 
        // so registering them As<IController>() is incorrect. 
        // Also, if you register controllers manually and choose to specify 
        // lifetimes, you must register them as InstancePerDependency() or 
        // InstancePerHttpRequest() - ASP.NET MVC will throw an exception if 
        // you try to reuse a controller instance for multiple requests. 
        builder.RegisterControllers(typeof(MvcApplication).Assembly)
               .InstancePerHttpRequest();

        #endregion

        #region Register modules
        builder.RegisterAssemblyModules(typeof(MvcApplication).Assembly);
        #endregion

        #region Model binder providers - excluded - not sure if need
        //builder.RegisterModelBinders(Assembly.GetExecutingAssembly());
        //builder.RegisterModelBinderProvider();
        #endregion

        #region Inject HTTP Abstractions
        /*
         The MVC Integration includes an Autofac module that will add HTTP request 
         lifetime scoped registrations for the HTTP abstraction classes. The 
         following abstract classes are included: 
        -- HttpContextBase 
        -- HttpRequestBase 
        -- HttpResponseBase 
        -- HttpServerUtilityBase 
        -- HttpSessionStateBase 
        -- HttpApplicationStateBase 
        -- HttpBrowserCapabilitiesBase 
        -- HttpCachePolicyBase 
        -- VirtualPathProvider 

        To use these abstractions add the AutofacWebTypesModule to the container 
        using the standard RegisterModule method. 
        */
        builder.RegisterModule<AutofacWebTypesModule>();

        #endregion

        #region Set the MVC dependency resolver to use Autofac
        var container = builder.Build();
        DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
        #endregion

    }

 }

Then you can register modules as you see fit which is really great if you have a modularised application and you don't know what you are going to include in your project. You can nuget setup your project and no manual intervention required (I wish!)....

public class RegisterApplicationIoC : Module
{
    protected override void Load(ContainerBuilder builder)
    {
        builder.RegisterType<EmailSenderToDebug>()
               .As<IEmailSender>()
               .InstancePerHttpRequest();
    }
}