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What is the Repository Pattern? When and why to use it?

Anubhav Sharma 433 10 Jun 2025

What is the Repository Pattern? When and why to use it?

c# c#
Updated 12 Jun 2025
Anubhav Sharma
Anubhav Sharma

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1 Answers

Ravi Vishwakarma
Ravi Vishwakarma 12 Jun 2025
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What is the Repository Pattern in C#?

The Repository Pattern is a design pattern that acts as a mediator between the business logic and the data access layer. It provides a consistent way to access, manage, and query data, while hiding the details of data storage.

Definition

A repository is a collection-like interface for accessing domain objects, centralizing data logic or querying logic to keep the application clean and maintainable.

Purpose of Repository Pattern

  • Encapsulate data access logic
  • Promote separation of concerns
  • Improve testability (mocking the repository)
  • Enable switching between different data sources (e.g., from SQL to NoSQL)
  • Reduce code duplication for common data operations

Structure of Repository Pattern

Controller → Service/Business Layer → Repository → Data Source (DB)

Typical Repository Interface

public interface IRepository<T>
{
    T GetById(int id);
    IEnumerable<T> GetAll();
    void Add(T entity);
    void Delete(T entity);
    void Update(T entity);
}

Concrete Implementation Example

public class UserRepository : IRepository<User>
{
    private readonly DbContext _context;

    public UserRepository(DbContext context)
    {
        _context = context;
    }

    public User GetById(int id) => _context.Users.Find(id);
    public IEnumerable<User> GetAll() => _context.Users.ToList();
    public void Add(User user) => _context.Users.Add(user);
    public void Delete(User user) => _context.Users.Remove(user);
    public void Update(User user) => _context.Users.Update(user);
}

When to Use the Repository Pattern

Situation Use Repository Pattern?
Complex data logic in controllers ✅ Yes
Need to unit test business logic ✅ Yes
Want to abstract away EF Core ✅ Yes
Simple CRUD-only apps ❌ May be overkill

Benefits

  • Decouples business logic from data logic
  • Makes code more readable and maintainable
  • Supports unit testing with mock repositories
  • Promotes DRY (Don't Repeat Yourself) principle

Drawbacks

  • Can introduce unnecessary abstraction in simple applications
  • If overused, may lead to code duplication or complexity
  • With EF Core, the DbContext already acts like a repository

Summary

Aspect Repository Pattern
Main Goal Abstract data access logic
Improves Testability, maintainability
Best For Medium to large apps with business logic
Not Ideal For Simple apps with only CRUD
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