Dependency Injection in .NET MVC (.NET Core)

Understand why dependency injection matters by illustrating a non-DI scenario, creating a market condition enum and a market forecaster service in an ASP.NET Core home controller.

Showcases constructor dependency injection by injecting IMarketForecaster into the home controller via a private field, with the IOC container registering the service and managing objects.

Explore framework services in ASP.NET Core, including IWebHostEnvironment, ILogger, IHttpContextFactory, IOptions, IStartup, and IApplicationBuilderFactory, and distinguish them from application services via dependency injection.

Configure the app settings container by registering the WazeForecastSettings, Stripe, SendGrid, and Twilio sections with the GetSection extension and services.Configure, enabling IOptions and injection into the home controller.

Refactor startup by moving app settings registration into a dedicated DI_Config class and an extension method, keeping startup.cs concise and maintainable.

Learn how the built-in dependency injection container in ASP.NET Core manages service lifetimes: singleton, scoped, and transient, with examples showing per-application, per-request, and per-injection instances.

Create a custom middleware that injects transient, scoped, and singleton services into HttpContext. It stores their GUIDs in context.Items and forwards the request to the next middleware.

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Create the credit result view model and two views for credit application and credit result, wire up the controller actions and model binding in ASP.NET Core.

Implement multiple validation checkers in .NET 5 by creating the IValidation checker interface and two implementations: address and credit validators, and register them to validate credit applications.

Register the credit validator and its validation checkers in startup.cs using services.AddScoped, wiring ICreditValidator and IValidationChecker implementations for dependency injection.