Explain the MVC pattern in ASP.NET Core.
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Dependency Injection (DI) in .NET is a design pattern and technique used to achieve loose coupling between classes and their dependencies. Instead of a class creating its own dependencies, they are provided (injected) from the outside—typically by a DI container. This makes the application easier to maintain, test, and extend
The MVC (Model-View-Controller) pattern in ASP.NET Core is a design pattern used to separate an application into three main components:
🔧 1. Model
What it does: Represents the data and the business logic.
Role: Manages the data, often interacting with the database (e.g., using Entity Framework Core).
Example:
csharp
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public class Product
{
public int Id { get; set; }
public string Name { get; set; }
public decimal Price { get; set; }
}
🎨 2. View
What it does: Responsible for the UI (user interface).
Role: Displays data to the user, usually based on the model data passed from the controller.
Technology used: Razor syntax in .cshtml files.
Example: A view might display a list of products using @model List<Product>.
🎮 3. Controller
What it does: Handles user input, processes requests, and returns responses.
Role: Acts as a bridge between the Model and the View.
Example:
csharp
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public class ProductsController : Controller
{
private readonly ApplicationDbContext _context;
public ProductsController(ApplicationDbContext context)
{
_context = context;
}
public IActionResult Index()
{
var products = _context.Products.ToList();
return View(products);
}
}
🛠 How It All Works Together
User requests a URL (e.g., /Products/Index).
Routing maps that to ProductsController.Index().
Controller uses the Model to get data.
Controller passes the data to the View.
View renders HTML and returns it to the browser.
🧭 Benefits of MVC
Separation of concerns: Easier to manage and test.
Scalability: You can evolve views and business logic independently.
Maintainability: Clean architecture for complex applications.
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