Core MVC Web Development Tutorial: Building a Complete CRUD Application7

Introduction

Core is a powerful and versatile framework for building dynamic and interactive web applications. In this tutorial, we will take a comprehensive approach to web development by creating a complete CRUD (Create, Read, Update, Delete) application using Core MVC. We will cover the fundamentals of Core, the Model-View-Controller (MVC) design pattern, and essential web development concepts.

Creating the Core Project

To begin, we need to create a new Core project using the .NET Core CLI. Open a command prompt or terminal and run the following command:```
dotnet new mvc -o MyCrudApp
```

This command will create a new Core MVC project named "MyCrudApp." Navigate to the project directory and open the solution file (".sln") in your preferred IDE (e.g., Visual Studio, Visual Studio Code).

Setting Up the Database

Our CRUD application will require a database to store and retrieve data. In this tutorial, we will use Microsoft SQL Server Express LocalDB. If you don't have it installed, download and install SQL Server Express LocalDB from Microsoft's website.

We will create a simple database and table using Entity Framework Core. Add the following code to the "" file within the "ConfigureServices" method:```csharp
using ;
public void ConfigureServices(IServiceCollection services)
{
(options =>
("Server=(localdb)\\MSSQLLocalDB;Database=MyCrudAppDB;Trusted_Connection=True;"));
}
```

This code registers the "MyCrudAppContext" DbContext, which represents our database context. It connects to a database called "MyCrudAppDB" in SQL Server Express LocalDB.

Creating the Models

Models represent the data structures of our application. For our CRUD application, we will create a simple "Product" model:```csharp
using ;
public class Product
{
public int Id { get; set; }
[Required]
public string Name { get; set; }
public int Price { get; set; }
public string Description { get; set; }
}
```

This model contains properties for product ID, name, price, and description. The "[Required]" attribute ensures that the "Name" property cannot be null.

Creating the Repository Interface and Service

Repositories provide an abstraction layer between the Controller and the Data Access Layer. We will create a generic repository interface "IRepository" and a concrete implementation "Repository" for our "Product" model:```csharp
public interface IRepository
{
Task GetByIdAsync(int id);
Task GetAllAsync();
Task CreateAsync(T entity);
Task UpdateAsync(T entity);
Task DeleteAsync(T entity);
}
public class Repository : IRepository
{
private readonly MyCrudAppContext _context;
public Repository(MyCrudAppContext context)
{
_context = context;
}
// Implementation of repository methods
}
```

The "ProductService" provides business logic for our CRUD operations:```csharp
public class ProductService
{
private readonly IRepository _repository;
public ProductService(IRepository repository)
{
_repository = repository;
}
public async Task GetByIdAsync(int id)
{
return await (id);
}
public async Task GetAllAsync()
{
return await ();
}
public async Task CreateAsync(Product product)
{
return await (product);
}
public async Task UpdateAsync(Product product)
{
return await (product);
}
public async Task DeleteAsync(Product product)
{
await (product);
}
}
```

Creating the Controllers

Controllers handle HTTP requests and responses. We will create three controllers for our CRUD application:

```csharp
public class ProductController : Controller
{
private readonly ProductService _productService;
public ProductController(ProductService productService)
{
_productService = productService;
}
public async Task Index()
{
return View(await ());
}
public async Task Details(int id)
{
var product = await (id);
if (product == null)
{
return NotFound();
}
return View(product);
}
public IActionResult Create()
{
return View();
}
[HttpPost]
[ValidateAntiForgeryToken]
public async Task Create([Bind("Name,Price,Description")] Product product)
{
if ()
{
await (product);
return RedirectToAction(nameof(Index));
}
return View(product);
}
public async Task Edit(int id)
{
var product = await (id);
if (product == null)
{
return NotFound();
}
return View(product);
}
[HttpPost]
[ValidateAntiForgeryToken]
public async Task Edit(int id, [Bind("Id,Name,Price,Description")] Product product)
{
if (id != )
{
return NotFound();
}
if ()
{
await (product);
return RedirectToAction(nameof(Index));
}
return View(product);
}
public async Task Delete(int id)
{
var product = await (id);
if (product == null)
{
return NotFound();
}
return View(product);
}
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public async Task DeleteConfirmed(int id)
{
await (await (id));
return RedirectToAction(nameof(Index));
}
}
```

Creating the Views

Views are used to display and gather data from users. We will create separate views for each CRUD operation:

```html
@model IEnumerable
@{
ViewData["Title"] = "Product List";
}

@(model => )

@(model => )

@(model => )

@foreach (var item in Model)
{

@(modelItem => )

@(modelItem => )

@(modelItem => )

|
|

}

```

```html
@model
@{
ViewData["Title"] = "Product Details";
}