ASP.NET Core MVC

Level : Beginner

Mentor: Shailendra Chauhan

Duration : 00:03:00

MVC Pattern

ASP.NET Core MVC follows the Model-View-Controller (MVC) architectural pattern. The model represents the application's data and business logic, the view displays the data to the user, and the controller handles user input and controls the flow of the application.

Example

// MVC Controller action that returns a view
public IActionResult Index()
{
  List<string> items = new List<string> { "Item 1", "Item 2", "Item 3" };
  return View(items);
}

Model Responsibilities

In ASP.NET Core MVC, models are responsible for defining the data structures, business logic, and data access methods for the application.

Example

public class Product
{
  public int Id { get; set; }
  public string Name { get; set; }
  public decimal Price { get; set; }
}

View Responsibilities

Views in ASP.NET Core MVC are responsible for presenting the data to the user and rendering the user interface.

Example

@model List<string>
<ul>
  @foreach (var item in Model)
  {
    <li>@item</li>
  }
</ul>

Controller Responsibilities

Controllers in ASP.NET Core MVC handle user requests, invoke appropriate business logic in the model, and determine which view to render.

Example

public class ProductController : Controller
{
  public IActionResult Details(int id)
  {
    var product = ProductService.GetProductById(id);
    return View(product);
  }
}

ASP.NET Core MVC

ASP.NET Core MVC is a framework for building web applications using the Model-View-Controller pattern, and it's designed for cross-platform development.

Example

// Startup.cs
public void ConfigureServices(IServiceCollection services)
{
  services.AddMvc();
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
  app.UseRouting();
  app.UseEndpoints(endpoints =>
  {
    endpoints.MapControllerRoute(
      name: "default",
      pattern: "{controller=Home}/{action=Index}/{id?}");
  });
}

Routing

Routing in ASP.NET Core MVC defines how incoming requests are mapped to controller actions. It specifies which action should handle a particular URL.

Example

[Route("products")]
public IActionResult Index()
{
  // Action logic
}

Model Binding

Model binding in ASP.NET Core MVC maps incoming HTTP request data to action method parameters, simplifying data retrieval and interaction.

Example

public IActionResult Create([Bind("Name,Price")] Product product)
{
  // Create the product using model binding
}

Model Validation

ASP.NET Core MVC provides built-in model validation to ensure that data meets specific criteria before processing.

Example

[HttpPost]
public IActionResult Create(Product product)
{
  if (ModelState.IsValid)
  {
    // Process the valid product data
  }
}

Dependency Injection

ASP.NET Core MVC has built-in support for dependency injection, making it easy to inject services and components into controllers, views, and other application parts.

Example

public class ProductController : Controller
{
  private readonly IProductService _productService;
  public ProductController(IProductService productService)
  {
    _productService = productService;
  }
  // Use _productService to interact with product data
}

Filters

Filters in ASP.NET Core MVC are used to implement cross-cutting concerns like authentication, logging, and caching that can be applied to controllers and actions.

Example

[Authorize]
public IActionResult SecureAction()
{
  // Action logic for authenticated users
}

Areas

Areas in ASP.NET Core MVC allow you to organize controllers, views, and models into separate logical sections within your application.

Web APIs

ASP.NET Core allows you to build Web APIs for data exchange using JSON or XML, making it easy to expose your application's functionality to other systems.

Testability

ASP.NET Core MVC is designed with testability in mind, enabling unit and integration testing of controllers, services, and other application components.

Razor View Engine

Razor is the default view engine in ASP.NET Core MVC, allowing developers to create dynamic and reusable views with a clean and concise syntax.

Strongly Typed Views

Strongly typed views in ASP.NET Core MVC provide compile-time checking and intellisense support when working with view models, reducing runtime errors.

Tag Helpers

Tag Helpers are a way to create reusable and HTML-friendly components within Razor views, simplifying the generation of HTML.

View Components

View components in ASP.NET Core MVC are similar to partial views but provide more encapsulation and reusability for rendering complex UI elements.

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