Creating a SignalR hub

In this section, we are going to implement what is called a SignalR hub in our ASP.NET core backend. A hub is a class on the server where we can interact with clients. We can choose to interact with a single client, all connected clients, or just a subset of them.

Let's open our backend project in Visual Studio and carry out the following steps:

1. In Solution Explorer, create a new folder called Hubs at the root level.
2. In the Hubs folder, create a new class file called QuestionsHub.cs that contains the following content:

using Microsoft.AspNetCore.SignalR;
using System;
using System.Threading.Tasks;

namespace QandA.Hubs
{
    public class QuestionsHub: Hub
    {
        
    }
}

Our class is called QuestionsHub and we inherit from the base Hub class in SignalR. The base Hub class gives us the features we need to interact with clients.

3. Let's override a...