Book Image

Modern Web Development with ASP.NET Core 3 - Second Edition

By : Ricardo Peres
Book Image

Modern Web Development with ASP.NET Core 3 - Second Edition

By: Ricardo Peres

Overview of this book

ASP.NET has been the preferred choice of web developers for a long time. With ASP.NET Core 3, Microsoft has made internal changes to the framework along with introducing new additions that will change the way you approach web development. This second edition has been thoroughly updated to help you make the most of the latest features in the framework, right from gRPC and conventions to Blazor, which has a new chapter dedicated to it. You’ll begin with an overview of the essential topics, exploring the Model-View-Controller (MVC) pattern, various platforms, dependencies, and frameworks. Next, you’ll learn how to set up and configure the MVC environment, before delving into advanced routing options. As you advance, you’ll get to grips with controllers and actions to process requests, and later understand how to create HTML inputs for models. Moving on, you'll discover the essential aspects of syntax and processes when working with Razor. You'll also get up to speed with client-side development and explore the testing, logging, scalability, and security aspects of ASP.NET Core. Finally, you'll learn how to deploy ASP.NET Core to several environments, such as Azure, Amazon Web Services (AWS), and Docker. By the end of the book, you’ll be well versed in development in ASP.NET Core and will have a deep understanding of how to interact with the framework and work cross-platform.
Table of Contents (26 chapters)
Section 1: The Fundamentals of ASP.NET Core 3
Section 2: Improving Productivity
Section 3: Advanced Topics
Appendix A: The dotnet Tool

Maintaining the state

What if you need to maintain a state, either from one component to the other in the same request, or across requests? Web applications have traditionally offered solutions for this. Let's explore the options we have.

Using the request

Any object that you store in the request (in memory) will be available throughout its duration. Items are a strongly typed dictionary in the HttpContext class:

this.HttpContext.Items["timestamp"] = DateTime.UtcNow;

You can check for the existence of the item before accessing it; it is worth noting that the following is case sensitive:

if (this.HttpContext.Items.ContainsKey("timestamp")) { ... }

Of course, you can also remove an item:


Using form data

The Form collection keeps track of all values submitted by an HTML FORM, normally after a POST request. To access it, you use the...