Repository Pattern in ASP.NET Core

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Repository Pattern in ASP.NET Core – Simplifying Data Access

The Repository Pattern is a popular design pattern used in ASP.NET Core to manage data access logic and business logic separately. It acts as a mediator between the application and the data source, offering a clean and decoupled approach to working with databases like SQL Server or PostgreSQL.

What is the Repository Pattern?

The Repository Pattern provides a centralized place for data access logic. Instead of directly interacting with DbContext across the application, a repository exposes a set of methods for common operations like Add, Update, Delete, and GetAll. This helps abstract the persistence layer, making the application easier to test and maintain.

Benefits:

Separation of concerns: Keeps your business logic clean from database logic.

Testability: Easily mock repositories for unit testing.

Reusability: Centralized data access logic reduces code duplication.

Example:

csharp

public interface IProductRepository

{

    IEnumerable<Product> GetAll();

    Product GetById(int id);

    void Add(Product product);

    void Delete(int id);

}

csharp

public class ProductRepository : IProductRepository

{

    private readonly AppDbContext _context;

    public ProductRepository(AppDbContext context)

    {

        _context = context;

    }

    public IEnumerable<Product> GetAll() => _context.Products.ToList();

    public Product GetById(int id) => _context.Products.Find(id);

    public void Add(Product product) => _context.Products.Add(product);

    public void Delete(int id)

    {

        var product = _context.Products.Find(id);

        if (product != null) _context.Products.Remove(product);

    }

}

By using the Repository Pattern, your ASP.NET Core applications become more modular, scalable, and easier to maintain in the long run.

Read More

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