autofac – Tarik Billa

What does AsSelf do in autofac? [duplicate]

April 9, 2024 by Tarik

Typically you would want to inject interfaces, rather than implementations into your classes. But let’s assume you have: interface IFooService { } class FooService { } Registering builder.RegisterType<FooService>() allows you to inject FooService, but you can’t inject IFooService, even if FooService implements it. This is equivalent to builder.RegisterType<FooService>().AsSelf(). Registering builder.RegisterType<FooService>().As<IFooService>() allows you to inject IFooService, … Read more

SignalR + Autofac + OWIN: Why doesn’t GlobalHost.ConnectionManager.GetHubContext work?

January 8, 2024 by Tarik

If you use a custom dependency resolver with SignalR, you can no longer use GlobalHost unless you modify it: GlobalHost.DependencyResolver = new AutofacDependencyResolver(container); IHubContext hubContext = GlobalHost.ConnectionManager.GetHubContext<MyHub>(); // A custom HubConfiguration is now unnecessary, since MapSignalR will // use the resolver from GlobalHost by default. app.MapSignalR(); If you don’t want to modify GlobalHost, you will … Read more

.NET 4, AllowPartiallyTrustedCallers attribute, and security markings like SecurityCritical

January 7, 2024 by Tarik

You are correct: in .NET 4, leaving the APTCA on there makes the assembly SecurityTransparent, and that may be what’s causing you grief. The MSDN article Migrating an APTCA Assembly to the .NET Framework 4 has a good discussion and explanation of the changes to the AllowPartiallyTrustedCallersAttribute in .NET 4. Specifically: The AllowPartiallyTrustedCallers attribute has … Read more

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

January 6, 2024 by Tarik

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 … Read more

Dependency Injection and IDisposable

January 4, 2024 by Tarik

The general rule of resources is that: He who owns the resource is responsible of disposing of it. This means that if a class owns a resource, it should either dispose of it in the same method that it created it in (in which case the disposable is called an ephemeral disposable), or if that’s … Read more

Register global filters in ASP.Net MVC 4 and Autofac

January 3, 2024 by Tarik

There’s a new way of registering MVC global filters in AutoFac. First, remove the filter registration from your RegisterGlobalFilters because we will have Autofac handle adding them to our controllers/actions instead of MVC. Then, register your container as follows: var builder = new ContainerBuilder(); builder.RegisterControllers(Assembly.GetExecutingAssembly()); builder.RegisterType<MyProperty>().As<IProperty>(); builder.Register(c => new CustomFilterAttribute(c.Resolve<IProperty>())) .AsActionFilterFor<Controller>().InstancePerHttpRequest(); builder.RegisterFilterProvider(); IContainer container = … Read more

How do I resolve Web API controllers using Autofac in a mixed Web API and MVC application?

December 31, 2023 by Tarik

I would suggest the following to make this work in your application with both MVC and WebApi. First your project will need to have references to the following Autofac Autofac.WebApi Autofac.Mvc5 (change the number at the end to match your aspnet mvc version) Then in your Autofac registration you would need the following which will … Read more

Autofac and Func factories

December 22, 2023 by Tarik

You are calling secVMFactory outside of your FirstViewModel constructor so by that time the ResolveOperation is disposed and in your factory method the c.Resolve will throw the exception. Luckily the exception message is very descriptive and telling you what to do: When registering components using lambdas, the IComponentContext ‘c’ parameter to the lambda cannot be … Read more

In Autofac how do I change the instance that is registered after Build has been called?

December 11, 2023 by Tarik

At the time you want to change the registration, create a new ContainerBuilder, register the new instance, and call Update passing in the container: // at some later point… builder = new ContainerBuilder(); builder.RegisterInstance(myType2); builder.Update(container);

None of the constructors found with ‘Autofac.Core.Activators.Reflection.DefaultConstructorFinder’

December 5, 2023 by Tarik

You have regiestered your EmailService two times. Once in the web.config and once with builder.RegisterType<EmailService>().As<IEmailService>().SingleInstance(); If you have the line above in the Core.ModuleInstaller then it will override the web.config configuration. And because here you haven’t specified the parameter Autofac throws an exception. So to solve this just remove the EmailService registration from the Core.ModuleInstaller … Read more