Get HubContext from outside of Hub using Aspnetcore.signalr libray (not from Controller)

Question

I am developing SignalR service using AspNetCore.SignalR.

Following is my Hub:

public class NotificationHub : Microsoft.AspNetCore.SignalR.Hub
    {
        public override async Task OnConnectedAsync()
        {
            await base.OnConnectedAsync();
        }

        public override async Task OnDisconnectedAsync(Exception exception)
        {
            await base.OnDisconnectedAsync(exception);
        }
    }

Following is Another Context class that i have created to invoke Hub's method on client side:

public class NotificationHubContext
    {
        private readonly IHubContext<NotificationHub> _context;

        public NotificationHubContext(IHubContext<NotificationHub> context)
        {
            _context = context;
        }

        public async Task Broadcast(string groupId, string eventName, object data)
        {
            await _context.Clients.Group(groupId).SendAsync(eventName, data);
        }
    }

I would like to Inject reference of NotificationContext class into my own IoC Container so I can just resolve it and call a BroadCast method on it and it should handle sending messages to clients.

I am using Service Bus to listen for messages from another part of the system, once I receive a message from Queue, I would like to notify Connected clients using HubContext from QueueHandler.

Assembly Info

I believe this answers your question https://stackoverflow.com/questions/27299289/how-to-get-signalr-hub-context-in-a-asp-net-core — iNovelletto, May 30 '18 at 02:28
@iNovelletto I am trying to use HubContext without using Controller. — Sagar, May 30 '18 at 14:36
Sorry, then problably this solves your problem: https://stackoverflow.com/questions/37318209/asp-net-core-rc2-signalr-hub-context-outside-request-thread — iNovelletto, May 30 '18 at 20:10
Which IoC Container are you using, and how have you registered it? — aaron, May 31 '18 at 00:47

score 1 · Accepted Answer · answered Jun 01 '18 at 14:15

1

var hubContext = app.ApplicationServices.GetService<IHubContext<Notification>>

That resolved my issue.

answered Jun 01 '18 at 14:15

Sagar

33
7

score 0 · Answer 2 · answered Apr 14 '20 at 18:10

I design my class as below.

public class NotificationHub : Microsoft.AspNetCore.SignalR.Hub
{
    public static IHubContext<NotificationHub> Current { get; set; }
}

In your Startup class

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    NotificationHub.Current = app.ApplicationServices.GetService<IHubContext<NotificationFromServerHub>>();

}

So, you can use as like this from anywhere.

public class MyBizClass
{
    public void DoSomething()
    {
        NotificationHub.Current.MyMethod(...);
    }
}

Get HubContext from outside of Hub using Aspnetcore.signalr libray (not from Controller)

2 Answers2