Dependency Injection Principles Practices And Patterns – Mark Seemann

This is the method where you get the chance to wire up all required Dependencies and supply them to the controller before returning the instance. You’ll see an example in a moment. If you created any resources that need to be explicitly disposed of, you can do that when the Release method is called.

We’ll go into further details about releasing components in the next chapter. A more practical way to ensure that Dependencies are disposed of is to add them to the list of disposable request objects using the HttpContext.Response.RegisterForDispose method. Although implementing a custom controller activator is the hard part, it won’t be used unless we tell ASP.NET Core MVC about it. Using a custom controller activator in ASP.NET Core A custom controller activator can be added as part of the application startup sequence — usually in the Startup class.

They’re used by calling AddSingleton on the IServiceCollection instance. The next listing shows the Startup class from the sample e-commerce application. Listing 7.7 Commerce application’s Startup class public class Startup { public Startup(IConfiguration configuration) { this.Configuration = configuration; } public IConfiguration Configuration { get; } public void ConfigureServices(IServiceCollection services) { services.AddMvc(); var controllerActivator = new CommerceControllerActivator( Configuration.GetConnectionString(“CommerceConnectionString”)); services.AddSingleton (controllerActivator); } public void Configure(ApplicationBuilder app, IHostingEnvironment env) { … } } This listing creates a new instance of the custom CommerceControllerActivator.

By adding it to the list of known services using AddSingleton, you ensure the creation of controllers is Intercepted by your custom controller activator. If this code looks vaguely familiar, it’s because you saw something similar in section 4.1.3. Back then, we promised to show you how to implement a custom controller activator in chapter 7, and what do you know?

This is chapter 7. Example: implementing the CommerceControllerActivator As you might recall from chapters 2 and 3, the e-commerce sample application presents the visitor of the website with a list of products and their prices. In section 6.2, we added a feature that allowed users to calculate a route between two locations. Although we’ve shown several snippets of the Composition Root, we didn’t show a complete example.

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