How can I call all the signal R events without explicitly invoking them using hubconnection.On method

Question

We have a API with SignalR implementation for chat, reminder and so on. I want to invoke all of methods on my client portal that's on angular without passing hub method names explicitly through hub connection "On" method like below.

 this.hubConnection.on('SignalMessageReceived', (payload: any) => {
      // business logic goes here
    });

MS Reference

Answer 1

You have to do declare an interface for your methods and a hub:

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

namespace MyApp.Hubs
{
  public interface IChat
  {
    Task SignalMessageReceived(string message);        
  }

  public class ChatHub : Hub<IChat>
  {       
   // here you can put methods that can be called from angular
  }
}

Then in Startup.cs:

app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
            endpoints.MapHub<MyApp.Hubs.ChatHub>("api/hubs/chat");
        });

Now when you want to invoke the method you get a reference to IHubContext<ChatHub, IChat> hubcontext through dependency injection. For example in a controller you can do:

IChat hub = hubcontext.Clients.All;
await  hub.SignalMessageReceived("Hello");