ASP.NET Core Web API with .NET 8 in 2024 – 10. Using Repository Pattern and DI

“Okay guys, listen up, our controllers are out of control with database calls. We need to code to an abstraction, AKA code to an interface. That’s where the repository pattern comes in. It hides repetitive code and allows for easy changes. And don’t forget about dependency injection – it preheats the code oven. Implementing all of this will clean up our messy controllers and make our code base more manageable. It’s like giving your code a makeover! 💻🔨 #CodeCleanUp”

Overview 📝

In this article, we’ll explore the concept of the Repository Pattern and Dependency Injection within an ASP.NET Core Web API. We’ll dive into how these patterns can help us to solve the problem of having large controllers with database calls, and how we can effectively abstract our code to make it more manageable and maintainable.

The Problem at Hand

The current state of our controllers is cumbersome, with database calls mixed in, which makes the code difficult to maintain and extend.

Coding to an Abstraction

The solution lies in coding to an abstraction, which is where the Repository Pattern comes into play. This pattern allows us to abstract repetitive code, such as firstOrDefault, into a more manageable form such as findStock.

Implementing Repository Pattern and Dependency Injection 🚀

Now, let’s take a closer look at how we can implement the Repository Pattern and make use of Dependency Injection to achieve cleaner and more maintainable code.

Creating Interfaces

To get started, we’ll create a folder for our interfaces and define an IStockRepository with methods like getAllAsync.

| Method          | Description               |
|-----------------|---------------------------|
| getAllAsync     | Retrieve all stocks       |

Creating Repositories

Next, we’ll create a repository folder and implement the StockRepository, which will be injected with the IStockRepository interface.

Utilizing Dependency Injection

We’ll also make use of Constructor-based Dependency Injection to ensure that the necessary objects, such as the application DB context, are available when we use these new methods and abstractions.

Wiring Up Services

Finally, we’ll wire up our services in the program.cs and ensure that our IStockRepository and StockRepository are properly scoped.

Conclusion 🎯

In conclusion, by implementing the Repository Pattern and making use of Dependency Injection, we can effectively separate concerns, abstract our code, and maintain cleaner and more manageable controllers.

Key Takeaways 🌟

• The Repository Pattern helps to abstract repetitive database code.
• Dependency Injection ensures that necessary objects are available when using new methods and abstractions.

FAQs ❓

Q: Why is the Repository Pattern necessary?
A: The Repository Pattern allows us to abstract repetitive database code and ensures cleaner controllers.

Q: What does Dependency Injection achieve?
A: Dependency Injection ensures that necessary objects are available when using new methods and abstractions.

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