3. Controllers | Learning ASP.NET Core MVC Programming

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Learning ASP.NET Core MVC Programming

By : T. S. Ragupathi, Parameswaran

2 (2)

Learning ASP.NET Core MVC Programming

2 (2)

By: T. S. Ragupathi, Parameswaran

Overview of this book

ASP.NET Core MVC helps you build robust web applications using the Model-View-Controller design. This guide will help you in building applications which can be deployed on non-windows platforms such as Linux. In today’s age, it is crucial that you possess the ability to separate the programming and business logic, and this is exactly what ASP.NET Core MVC application will help you achieve. This version comes with a number of improvements that enable fast, TDD-friendly development to create sophisticated applications. You would also learn the fundamentals of Entity framework and on how to use the same in ASP.NET Core web applications. The book presents the fundamentals and philosophies of ASP.NET Core. Starting with an overview of the MVC pattern, we quickly dive into the aspects that you need to know to get started with ASP.NET. You will learn about the core architecture of model, view, and control. Integrating your application with Bootstrap, validating user input, interacting with databases, and deploying your application are some of the things that you will be able to execute with this fast-paced guide. The end of the book will test your knowledge as you build a fully working sample application using the skills you’ve learned throughout the book.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Introduction to ASP.NET Core

1. Introduction to ASP.NET Core

How web applications work

Client-side and server-side

HTTP methods

What is ASP.NET?

Features of ASP.NET MVC

ASP.NET 5

Summary

2. Setting Up the Environment

2. Setting Up the Environment

Purpose of IDE

Visual Studio offerings

Installing Visual Studio Community

Installing ASP.NET 5

Project structure in ASP.NET 5 application

Summary

3. Controllers

3. Controllers

Role of the Controller in ASP.NET MVC applications

Introduction to routing

Creating ASP.NET 5 application

Installing the ASP.NET Core NuGet package in your application

Our first Controller

Adding Views

Adding Models

Passing data from Controller to View

Filters

Summary

4. Views

4. Views

The View engine and the Razor View engine

Layout

Generating HTML

Partial View

View components

Tag Helpers

Summary

5. Models

5. Models

Models

Model binding

The Entity Framework

Using the Entity Framework in ASP.NET MVC applications

Database migration

Summary

6. Validation

6. Validation

Client-side and server-side validation

Server-side validation

Client-side validation

Implementation

Summary

7. Routing

7. Routing

Convention-based routing

Attribute-based routing

Route attribute at the controller level

Passing routing values in HTTP action verbs in the Controller

Route Constraints

Summary

8. Beautifying ASP.NET MVC Applications with Bootstrap

8. Beautifying ASP.NET MVC Applications with Bootstrap

Knowing HTML and CSS

Bootstrap

Using Bootstrap in your ASP.NET MVC application

Installing with Bower

HTML doctype

Summary

9. Deployment of ASP.NET Core Application

9. Deployment of ASP.NET Core Application

The project.json file

Microsoft Azure

Deploying the ASP.NET Core application in Azure

Deploying the ASP.NET Core web application in the Linux environment

Creating a new ASP.NET 5 project

Configuring the Nginx server

Summary

10. Building HTTP-based Web Services Using ASP.NET Web API

10. Building HTTP-based Web Services Using ASP.NET Web API

HTTP basics

Dependency Injection

Summary

11. Improving Performance of an ASP.NET Core Application

11. Improving Performance of an ASP.NET Core Application

The UI layer

Reducing the number of HTTP requests

Minification of JavaScript and CSS files and their combination

The caching process

The web/application layer

Generic performance improvement tips

Summary

12. ASP.NET Core Identity

12. ASP.NET Core Identity

Authentication

Authorization

Adding the relevant dependencies to the project.json file

Configuring the application to use Identity

Creating ViewModels

Creating Controllers and associated action methods

Creating Views

E-mail and SMS services

Securing an action method in a Controller

Summary

Adding Models

Models represent your business domain classes. Now, we are going to learn about how to use the Models in our controller. Create a Models folder and add a simple Employee class. This is a just a plain old C# class:

public class Employee { 
  public int EmployeeId { get; set; } 
  public string Name { get; set; } 
  public string Designation { get; set; } 
}

Create a new action method, Employee, in our HomeController, and create an object of the Employee Model with some values, and pass the Model to the View. Our idea is to use the Model employee values in the View to present them to the user:

using Chapter3.Models; 
public IActionResult Employee() { 
  //Sample Model - Usually this comes from database 
 Employee emp1 = new Employee { 
    EmployeeId = 1, 
    Name = "Jon Skeet", 
    Designation = " Software Architect" 
  }; 
  return View(emp1); 
}

Now, we need to add the respective View for this action...

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