Today I will focus on how we can use Autofac as a DI container for ASP.Net Core application. // Creating a new AutofacServiceProvider makes the container, // available to your app using the Microsoft IServiceProvider, // interface so you can use those abstractions rather than, IServiceProviderFactory{TContainerBuilder}, // This service provider will have access to global singletons, // and registrations but the "singletons" for things registered, // in the service collection will be "rooted" under this. You also may only need to do the Populate() call and not need the AutofacServiceProvider. This is not for ASP.NET Core 3+ or the .NET Core 3+ generic hosting support - ASP.NET Core 3 has deprecated the ability to return a service provider from ConfigureServices. To take advantage of Autofac in your .NET Core application via the Microsoft.Extensions.DependencyInjection package: You don’t have to use Microsoft.Extensions.DependencyInjection. (Thanks to builder.Populate). Register Components . The morale here is very close to the one in Andrew’s post: don’t assume everything you know about web host is true or will work with generic host. Using a child lifetime scope as the root is not compatible with multitenant support. This means you don’t necessarily have to use Autofac configuration to switch configuration between a development and production environment; you can set it up programmatically in Startup. The main concept behind inversion of control is to let the caller decide how the dependencies are created, … // Create the IServiceProvider based on the container. DataProvider class will return a static text. CreateWebHostBuilder -> CreateHostBuilder You didn't finish following the docs. // This is the MULTITENANT PART. In addition, use the ContainerBuilder class of Autofac to register the types. Use this method to add services to the container. © Copyright Autofac Project. This is for ASP.NET Core 3+ and the .NET Core 3+ generic hosting support: In your Startup class (which is basically the same across all the versions of ASP.NET Core) you then use ConfigureContainer to access the Autofac container builder and register things directly with Autofac. // child scope, unavailable to the rest of the application. Check that class out if you want a more in-depth understanding of how this works. If you use this, you will not be able to use the ASP.NET Core support for IServiceProviderFactory{TContainerBuilder} (the ConfigureContainer support). Go ahead and install this nuget package into each of your projects: Next, let’s build our services container and tell ASP.NET to use it. Examine the following MyDependency class with a WriteMessagemethod that other classes in an app depend upon: An instance of the MyDependency class can be created to make the WriteMessage method available to a class. privacy statement. The Populate() method offers an overload to allow you to specify a tagged child lifetime scope that should serve as the “container” for items. Sometimes the IHttpContextAccessor, commonly used in tenant identification, also isn’t set up in time. Code dependencies (such as the previous example) are problematic and shoul… Revision 62776d10. Learn more, We use analytics cookies to understand how you use our websites so we can make them better, e.g.

// Autofac provider to the generic hosting mechanism. // This is the default if you don't have an environment specific method. // This only gets called if your environment is Development. by @todthomson. Register your "root". If you’re using .NET Core without ASP.NET Core (and/or without the generic hosting), there’s a simpler example here showing that integration. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. You signed in with another tab or window.

The Configure, ConfigureServices, and ConfigureContainer methods all support environment-specific naming conventions based on the IHostingEnvironment.EnvironmentName in your app. An alternate approach to map the dependencies to an external class file, the Autofac allows to define the dependencies in Module class to keep the ConfigureServices() method clean and simple. If you want environment-specific setup you can put the environment name after the Configure part, like ConfigureDevelopment, ConfigureDevelopmentServices, and ConfigureDevelopmentContainer. // will result in a singleton that's ONLY used by this first host. The ASP.Net Core infrastructure will use the instance of AutofacServiceProvider as a DI container. For more information, see our Privacy Statement. In addition, I will update the implementation of the ConfigureServices method. The difference is that this one wraps the provided factory within the adapter. The. You register your services with Autofac as normal, except you also use, Build the container and return an instance of. Now run the application to see “Test data” in the browser. This is not for ASP.NET Core 3+ or the .NET Core 3+ generic hosting support - ASP.NET Core 3 requires you to specify a service provider factory directly rather than adding it to the service collection. What’s wrong?! VERSION WARNING: This was written for ASP.NET Core 1.0.0-rc1-final. The main concept behind inversion of control is to let the caller decide how the dependencies are created, instead of the class deciding it. This allows you to provide configuration actions that will be attached to a specific named lifetime scope rather than a built container. // If you make them BEFORE you call Populate, then the, // registrations in the ServiceCollection will override Autofac, // registrations; if you make them AFTER Populate, the Autofac, // registrations will override. NET Core 3.0 项目中使用 AutoFac.net core 3.1 今天已正式发布，3.1跟3.0差别不是很大，主要是对 3.0一小部分修复和完善，最重要的是.NET Core 3.1是长期支持（LTS）版本，建议大家升级。 .net core 2.2 这个月就要停止维护，并且微软将不再提供支持，如果你在使用 2.2 ，建议升级到 3.1，可以先升级 … Order is important! The IServiceProvider will automatically be created for you, so there’s nothing you have to do but register things. My controller methods return runtime errors.

All rights reserved. Learn more, Configure AutoFac in ASP.NET Core 3.0 Preview 5 or higher, ServiceCollectionContainerBuilderExtensions, 'ServiceType: CityController Lifetime: Transient ImplementationType: CityController'. Autofac is a dependency injection/inversion of control container used widely by .Net community. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. You can always update your selection by clicking Cookie Preferences at the bottom of the page.

What is Autofac. ASP.NET Core 2.1 brought a new feature that is generic hosts. This is, // just like a foreach over the list of things in the collection. ASP.NET Core 2.1 brought a new feature that is generic hosts. They allow to write apps that rely on ASP.NET Core concepts like logging, configuration and built-in DI but that are not web applications. The code in Startup class will change to use Autofac as the DI container.

The following third-party containers can be used with ASP.NET Core apps: Autofac; DryIoc; Grace; LightInject; Lamar; Stashbox; Unity; Thread safety. As of today, it has more than 26 million downloads in nuget.org. // As with the first host, the second host will share the root container but have its own, // root lifetime scope `root-two`. You must choose one or the other, not both. By default, the names are Configure, ConfigureServices, and ConfigureContainer. All rights reserved. Autofac is a dependency injection/inversion of control container used widely by .Net community. // This method gets called by the runtime. A dependency is any object that another object requires. © Copyright Autofac Project. Finally, I will update the default ValueController to use the IDataProvider to return the constant text “Test data” as a return to the Get method. Here’s an example of what you do in Program.Main: In a complex application you may want to keep services partitioned such that the root container is shared across different parts of the app, but a child lifetime scope is used for the hosted portion (e.g., the ASP.NET Core piece). The, // default ConfigureContainer won't be automatically called if this, // Add things to the ContainerBuilder that are only for the, // This only gets called if your environment is Staging. As of today, it has more than 26 million downloads in nuget.org. Populate those registered services into Autofac. If a method isn’t present with a name matching the environment it’ll fall back to the default. Perhaps, Autofac is the most popular DI/IoC container for ASP.NET projects. Special wiring that you may have done during registration of the controller (like setting up property injection) won’t work. Learn more.

Our ASP.NET Core integration docs have more info on specific topics relating to ASP.NET Core (and generically hosted application) usage. My controller methods return runtime errors. Doing that will automatically register controller types into the IServiceCollection when the service provider factory calls builder.Populate(services). Set up your tenant-specific stuff here. // Make your Autofac registrations. ASP.NET Core 3.0 Preview 4 and ASP.NET Core 3.0 Preview 5 introduced breaking changes and AutoFac no longer works. AutofacChildLifetimeScopeServiceProviderFactory, // create the root-container and register global dependencies, // Each host listens to a different URL, they have the same root container to share SingleInstance, // things, but they each have their own logical root lifetime scope. Have a question about this project? Theme based on Hyde The integration with ASP.NET Core is very similar to this since the whole framework has unified the abstraction around dependency injection.

by @mdo with modifications Configure AutoFac in ASP.NET Core 3.0 Preview 5 or higher. Hello everyone, and welcome back to dotnetcorecentral. The StartupLoader class in ASP.NET Core is what locates the methods to call during app startup. Following the AutoFac documentation, I was able to use AutoFac in ASP.NET Core 3.0 Preview 3. they're used to log you in. My controller methods return runtime errors. After the NuGet packages are installed, we will add a couple of types to the project. // The usual ConfigureServices registrations on the service collection... // Here's the change for child lifetime scope usage!

If you have any comments, tweet them to me :), ← Angular 2 Routing with ASP.NET Core 1 (aka ASP.NET 5), New Configuration and AppSettings for MVC6 - Web.config is Gone →, Entity Framework, Identity and MVC are added using the built in methods. Quick Start Guide Download via NuGet.

This means that registering an IServiceProviderFactory like services.AddAutofac() does conveys no meaning to a HostBuilder. Executing the app, the Asp.Net core will use Autofac to resolve dependencies. Register Components . // Obviously it's not super helpful being in this using block, // so likely you'll create the scope at app startup, keep it, // around during the app lifetime, and dispose of it manually. Notice one way to integrate returns void, not IServiceProvider. https://dotnetcorecentral.com/blog/creating-first-asp-net-core-web-api-application/, https://autofaccn.readthedocs.io/en/latest/index.html, https://github.com/choudhurynirjhar/AutofacIntegration, ← Entity Framework Core (A deep dive with SQL Server), How to manage Configuration in ASP.Net Core, How to run background tasks in ASP.NET Core Application, How to use SQLite with Dapper (In ASP.NET Core 3.1), RepoDb, a fantastic alternative for Dapper and Entity Framework Core. Configure AutoFac in ASP.NET Core 3.0 Preview 5 or higher. If it doesn’t work for your version, please tweet me to get it updated. If a singleton service has a dependency on a transient service, the transient service may also require thread safety depending how it's used by the singleton. At the moment there’s just one. If you are using ASP.NET classic, see the ASP.NET classic integration page. By default, ASP.NET Core will resolve the controller parameters from the container but doesn’t actually resolve the controller from the container. In addition, we will also install Autofac.Extensions.DependencyInjection nuget package.

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