Explore ASP.NET Core by delving into MVC design, JSON web APIs, repository patterns, and adding authentication. Gain insights to confidently develop full-stack or backend applications.

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ASP.NET

MVC in ASP.NET Core - Models in ASP.NET

MVC in ASP.NET Core - Models in ASP.NET-copy

This course is for you if you’re looking to start your journey in either full-stack MVC or backend development with ASP.NET Core.

In the first half of the course, you’ll learn about the Model-View-Controller design pattern and how you can use it to organize and develop your web application. You’ll then dive into JSON web APIs which allow communication between your back-end ASP.NET application and front-end web/mobile application.

In the latter half, you’ll learn about the repository pattern, how relationships work, and how to add authentication and authorization to your application.

By the end of this course, you will have the confidence to develop your own applications in ASP.NET Core.

Developing Applications with ASP.NET Core

# Get all data
Start off with an action method that is dealing with the GET requests. Call this method `GetUsers()`.

## Code

// GET: api/Users
[HttpGet]
public async Task<ActionResult<IEnumerable<User>>> GetUsers()
{
    return await _context.Users.ToListAsync();
}

## Explanation

`[HttpGet]` informs the framework that this method is a GET method, and the framework provides routing accordingly. In this example, the route will be `/Api/Users` with the request type of GET.

The action method return type is `Task<ActionResult<IEnumerable<User>>>`. Break this down to better understand what is going on.

* `IEnumerable<User>`: Your _User_ model is enclosed in `IEnumerable<>` which returns a collection or list of objects. 
* `ActionResult<>`: This is used to handle multiple return types in case of exceptions. This can return the object you are looking for and in case there is an error or the result does not exist, it can return such errors accordingly.
* `Task<>`: This allows a task to be performed asynchronously. 

In your return statement, you are accessing your database with the help of `_context`, which is followed by your User's table and returns that table in the form of a list.

```C#
return await _context.Users.ToListAsync();
```

# Get with respect to 'id'

To obtain a single user with the help of their id, create another action method and pass `id` as an input parameter. Name your method `GetUser()`.

## Code

Learn how to create action methods to obtain data via JSON Web APIs.

Introduction

Getting Started

MVC in ASP.NET Core

JSON Web APIs in ASP.NET Core

Working with Repositories

Relationships

Authentication and Authorization

Appendix

Conclusion

HTTP GET

Get all data

Code

Explanation