Book Image

Mastering ASP.NET Core 2.0

By : Ricardo Peres
Book Image

Mastering ASP.NET Core 2.0

By: Ricardo Peres

Overview of this book

<p>ASP.NET is an open source web framework that builds modern web apps and services. This book is your one-stop guide to the new features of ASP.NET Core 2.0, including web APIs and MVC. We begin with a brief overview of the basics, taking you through the MVC pattern, platforms, dependencies, and frameworks. We then move on to setting up and configuring the MVC environment before talking about routing and advanced routing options. Next, we'll look at model binding, controllers and actions, filters, user authentication, and testing.</p> <p>Moving on, you’ll learn about all the aspects of syntax and processes when working with Razor. You’ll be introduced to client-side development and will get to know about the security aspects of ASP.NET Core. We will also look at Microservices with ASP.NET Core. Finally, you’ll find out how to deploy ASP.NET Core to new environments such as Azure, AWS, and Docker. By the end of the book, you will be well versed with development in ASP.NET Core and will have a deep understanding of how to interact with the framework and work cross-platform.</p>
Table of Contents (23 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Page filters


This is a new one for Razor Pages. Basically, we can have custom actions being fired before or after a Razor Page's model method. As for the other filters, it is available in synchronous (IPageFilter) and asynchronous flavors (IAsyncPageFilter). Starting with the synchronous version, it declares three methods:

  • OnPageHandlerSelected: Called after the framework selects a target handler method for the processing of the request, giving developers a chance to change this
  • OnPageHandlerExecuting: Called before the handler is invoked
  • OnPageHandlerExecuted: Called after the handler is invoked

OnPageHandlerSelected takes a parameter of type PageHandlerSelectedContext, and this class offers the following properties:

  • ActionDescriptor (CompiledPageActionDescriptor): Describes the handler and model classes
  • HandlerMethod (HandlerMethodDescriptor): The method that will be called, and can be changed
  • HandlerInstance (object): The instance that will handle the request

The pre-event handler, OnPageHandlerExecuting...