The All Time Best Tutorial to Understand ASP.NET Core MVC

The ASP.NET Core framework is growing in popularity among developers and is anticipated to continue to do so in the future. On the .NET platform, ASP.NET is a well-known web development framework for constructing web applications. ASP.NET Core MVC is a robust framework for building online programs and APIs using the Model-View-Controller architectural pattern. You've come to the right place if you want to learn about ASP.NET Core. This article will provide you with a quick overview of ASP.NET Core MVC.

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What Is the MVC Pattern?

• The Model-View-Controller MVC architectural pattern divides an application into three major component groups: Models, Views, and Controllers. 
• The principle behind developing MVC is the separation of concerns. This principle implies that software should be classified based on the type of task it performs.
• Separation ensures that the business model is simple to test and can change without becoming too involved in low-level implementation details. 
• Using this MVC Pattern, user requests are routed to a Controller, who is in charge of interacting with the Model to conduct user actions and receive query results. The Controller selects the View to be displayed to the user and supplies it with any Model data it requires.

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What Is ASP.NET Core MVC?

• The ASP.NET Core MVC framework is a lightweight, open source, and robustly configurable presentation framework for ASP.NET Core.
• It is an Application Framework that allows you to create modern web apps using the MVC (Model View Controller) architectural pattern.
• It provides a pattern-based approach to developing dynamic websites of particular concerns. It allows you complete markup control, facilitates (Test-driven development)TDD-friendly development, and corresponds to the latest web standards.

Responsibilities/Functions of MVC

Model Responsibilities

• In an MVC application, the model represents the application's state and any other business logic or activities that should be executed by it.
• Business logic, and any implementation logic for maintaining the application's state, should be wrapped in the model. 
• ViewModel classes intended to contain the data to display on that view are often used in strongly-typed views. The controller uses the model to construct and populate these ViewModel instances.

View Responsibilities

• Views are in charge of displaying content through the user interface. The embed .NET code in HTML markup using the razor view engine. 
• Views should have minimal logic, and any logic should be related to presenting content. Consider using a view component, view model, or view template to simplify the view if you need to perform logic in view files to display data from a complex model.

Controller Responsibilities

• Controllers are the components that manage user input, interact with the model, and choose which view to render. 
• The view displays information in an MVC application; the controller processes and responds to user input and interaction. 
• The controller is the initial entry point in the MVC architecture, and it is responsible for deciding which model types to interact with and which view to present. Hence its name is the controller as it responds to a given request.

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Components of ASP.NET MVC

Routing

• ASP.NET Core MVC is built on top of ASP.NET Core routing, a robust URL-mapping component that enables applications with logical and searchable URLs.
• This allows us to establish URL naming patterns for applications that perform well for search engine optimization (SEO) and link generation, regardless of how the files on your web server are arranged.
• You may define your routes with a simple route template syntax that considers route value limitations, defaults, and optional values.

Model Binding

• Model binding in ASP.NET MVC transforms client request data (form values, route data, query string parameters, HTTP headers) into objects that the controller can handle. 
• As a result, your controller logic does not have to do the job of determining the incoming request data; instead, the data is passed as parameters to its action methods.

Model Validation

Validation is supported in ASP.NET Core by decorating your model object with data annotation validation attributes. Before values are sent to the server, the validation attributes are checked on the client-side. The framework validates request data on both the client and the server.

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Dependency Injection

• ASP.NET Core includes dependency injection capabilities. Controllers in ASP.NET Core can request required services through their constructors, allowing them to follow the Explicit Dependencies Principle.
• Dependency injection (DI) is a software design technique that achieves Inversion of Control (IoC) between classes and their dependencies.

Filters

• Filters in ASP.NET Core enable code to be executed before or after particular stages of the request processing pipeline. Filters can be used as attributes on controllers or actions.
• Filters manage duties such as authorization, restricting unauthorized access to resources, and response caching.
• Filters allow for the execution of custom pre and post-processing logic for action methods, and they may be set to run at specific points in the execution pipeline for a given request.

Areas

• Areas allow you to divide a large ASP.NET Core MVC Web app into smaller functional groups. An area is an MVC structure that exists within an application.
• Logical components such as Model, Controller, and View are kept in separate folders in an MVC project, and MVC uses naming conventions to build the relationship between these components.
• It may be good to partition a large app into different high-level functional regions.
• For example, consider an e-commerce app with numerous business units such as checkout, billing, and search, among others. Each of these units has its own set of logical component views, controllers, and models.

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Demo: Creating an ASP.NET Core MVC Web Application

Step 1: Open Visual Studio 2019 and Select Create a New Project

Once the visual studio is opened on the left-hand side, you can access the recently opened files.

And on the right-hand side, you have the following options:

• Clone a Repository: Get code from online repositories like Github and Azure
• Open a Project: Open a local visual studio project or .sln file
• Open a local folder: Navigate and edit code within any folder
• Create a new Project: Choose a project template to get started
• Select the option to create a new project.

Step 2: Choose the Project Template 

You will see a lot of templates available. But for creating an ASP.NET Core MVC Web application, select ASP.NET Core Web App(Model-View-Controller).

ASP.NET Core Web App(Model-View-Controller) is a project template for creating an ASP.NET Core application with an example, ASP.NET Core Views and Controllers. This template is also used for RESTful HTTP services. 

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Step 3: Fill in Project Name and Location

Configure your new project window consists of three options, namely

Project Name: Enter the required project name

Location: Select the location where you want to save your project

Solution Name: By default, the solution name is the same as the project name, But we can change it if required.

Step 4: Choose the Target Framework and Authentication Type

Choose the target framework .Net 2.1, .Net 3.1 or .NET 5.0 the latest version installed in your device. Also, select the authentication type and make the other changes as your project requirement. After entering the details, click the create option.

Step 5: The ASP.NET Core Web Application MVC is Created

Once the application is successfully created, click on solution explorer. The following folder list response is seen as shown in the figure below. 

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Step 6: Run the Application 

Now run the application with default contents or put some contents, thereby opening the index.cshtml file. Now press the run option to run the application in the browser. Once the application is successfully built, it will show in the browser, as shown in the image below.

Next Steps

This article on ‘ASP.NET Core MVC’ covers what MVC Pattern and ASP.NET MVC are. Following which it gives a detailed explanation of responsibilities and architecture of ASP.NET Core. Lastly, we have a Demo to get started with our first ASP.NET MVC Application.

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Please visit our YouTube channel for a thorough explanation of ASP.NET Core MVC if you require additional information.

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