Book Image

ASP.NET Core 3 and React

By : Carl Rippon
Book Image

ASP.NET Core 3 and React

By: Carl Rippon

Overview of this book

Microsoft's ASP.NET Core is a robust and high-performing cross-platform web API framework, and Facebook's React uses declarative JavaScript to drive a rich, interactive user experience on the client-side web. Together, they can be used to build full stack apps with enhanced security and scalability at each layer. This book will start by taking you through React and TypeScript components to build an intuitive single-page application. You’ll understand how to design scalable REST APIs that can integrate with a React-based frontend. You’ll get to grips with the latest features, popular patterns, and tools available in the React ecosystem, including function-based components, React Router, and Redux. The book shows how you can use TypeScript along with React to make the frontend robust and maintainable. You’ll then cover important .NET Core features such as API controllers, attribute routing, and model binding to help you build a sturdy backend. Additionally, you’ll explore API security with ASP.NET Core identity and authorization policies, and write reliable unit tests using both .NET Core and React before you deploy your app to the Azure cloud. By the end of the book, you’ll have gained all the knowledge you need to enhance your C# and JavaScript skills and build full stack, production-ready applications with ASP.NET Core and React.
Table of Contents (22 chapters)
Free Chapter
1
Section 1: Getting Started
4
Section 2: Building a Frontend with React and TypeScript
9
Section 3: Building an ASP.NET Core Backend
16
Section 4: Moving into Production
20
Assessments

Pushing data to SignalR clients from an API controller

Arguably the most valuable piece of our real-time API is pushing new answers to subscribed clients. In this section, we are going to learn how to do this. If we think about it, the ideal place to do this is in the questions API controller, which is where an answer is posted. So, when an answer is posted, we want SignalR to push the updated question with the saved answer to all the clients that are subscribed to the question. Let's implement this by carrying out the following steps in QuestionsController.cs:

  1. We'll start by referencing SignalR and our SignalR hub with using statements:
using Microsoft.AspNetCore.SignalR;
using QandA.Hubs;
  1. We are going to inject the context of the hub into the API controller using dependency injection:
[Route("api/[controller]")]
[ApiController]
public class QuestionsController...