ASP.NET Framework

Overview

ASP.NET Framework is an open-source, server-side web-application framework.

Model-View-Controller

Model-View-Controller (MVC) is a software design pattern commonly used for developing user interfaces that divides the related program logic into three interconnected elements.

mvc-flow

Model

Model represents the data and business logic.

A model is a class with properties.

To add model: Right-Click on Models --> Add --> Class --> FilenameModel.cs

// CustomerModel.cs
public class CustomerModel
{
    public string Name { get; set; }
    public int Age { get; set; } = 0;
    public bool IsAlive { get; set; } = true; // sets default value
 }

View

View is the user interface.

Views is divided into layout and templates.
The Shared folder in Views contains _Layout.cshtml (ref. CSHTML File)

Controller

Controller handles the user request. User interacts with View, which in-turn raises appropriate URL request, this request will be handled by a controller. The Controller renders View with the model data as a response.

The controller returns views.
Default controller in ASP.NET is HomeController.cs
Controller class inherits from System.Web.Mvc.Controller
Each public method in a controller is known as an action method.

To add controller: Right-Click on Controllers --> Add --> Controller --> MVC 5 ... Empty --> FilenameController.cs

This automatically creates a empty folder called FilenameController in Views.

// CustomerController.cs
public class CustomerController : Controller
{
    // GET: Customer
    public ActionResult Index()
    {
        return View();
    }
}

To add View inside this new folder: Right-Click on method name (Index()) --> Add View
The first part in controller name ( i.e. Home in HomeController) is a folder inside Views folder, which intern contains views.

Routing

Routes URL to pages.

Routing file (RouteConfig.cs) resides in the App_Start folder.

Bundling

CSHTML

Razor Syntax

NuGet (.NET Package Manager)

Error

// Web.config
<system.web>
  <customErrors mode="RemoteOnly"></customErrors>

Web API

Controller inherit from ApiController

HttpResponseMessage:

Example:

public class StudentsController : ApiController
{
    public HttpResponseMessage Get()
    {
        return Request.CreateResponse(HttpStatusCode.OK, students);
    }

    public HttpResponseMessage Get(int id)
    {
        var student = students.FirstOrDefault(s => s.Id == id);

        if(student == null)
        {
            return Request.CreateErrorResponse(HttpStatusCode.NotFound, "Student Not Found");
        }

        return Request.CreateResponse(HttpStatusCode.OK, student);
    }
}

IHttpActionResult:

New introduced in Web API 2
Clean Code
Simpler Unit Testing

Example:

public class StudentsController : ApiController
{
    public IHttpActionResult Get()
    {
        return Ok(students);
    }

    public IHttpActionResult Get(int id)
    {
        var student = students.FirstOrDefault(s => s.Id == id);

        if(student == null)
        {
            // return NotFound();
            return Content(HttpStatusCode.NotFound, "Student Not Found");
        }

        return Ok(student);
    }
}

ASP.NET Framework ​

Overview ​

Model-View-Controller ​

Model ​

View ​

Controller ​

Routing ​

Bundling ​

CSHTML ​

Razor Syntax ​

NuGet (.NET Package Manager) ​

Error ​

Web API ​