How to use shared SignalR Hub from different hosted project in ASP.NET Core 2.2

问题

I'm working with a project built with ASP.NET Core 2.2. The main solution contains multiple projects, which includes API, web and other class libraries.

We've used SignalR to displaying shared messages/notifications between the API project and the web project. For example, adding a new employee record from an API should call SignalR Hub and all the web client should received the notification.

Here is the current structure of our project

|- API
|- Hub_ClassLibrary
|- Services
|- Web

Flow:

Web > services > Hub 
API > services > Hub

Hub:

public class NotificationHub : Hub
{
    public async Task SendNotification(List<DocumentHistoryModel> notifications)
    {
        await Clients.All.SendAsync(Constants.ReceiveNotification, notifications);
    }
}

Web startup class:

app.UseSignalR(routes =>
{
    routes.MapHub<NotificationHub>("/notificationHub");
});

API startup class

app.UseSignalR(routes =>
{
    routes.MapHub<NotificationHub>("/notificationHub");
});

Service

private readonly IHubContext<NotificationHub> _hubContext;

public MyService(IHubContext<NotificationHub> hubContext)
{
    _hubContext = hubContext;
}

await _hubContext.Clients.All.SendAsync(ReceiveNotification, notifications);

The issue is, I can send and receive notifications from web, but from api call, web doesn't get any notification. I think problem is it creates two separate connections for each project, but then what is the best way to handle this kind of scenario?

Edit: I can get connection id and state "connected" in this api code, however, web is still not receiving any notification. Also tried connection.InvokeAsync

var connection = new HubConnectionBuilder()
     .WithUrl("https://localhost:44330/notificationhub")
     .Build();

connection.StartAsync().ContinueWith(task =>
{
    if (task.IsFaulted)
    {                    
    }
    else
    {                    
        connection.SendAsync("UpdateDashboardCount", "hello world");
    }
}).Wait();

来源：https://stackoverflow.com/questions/59840085/how-to-use-shared-signalr-hub-from-different-hosted-project-in-asp-net-core-2-2

标签

asp.net-core

signalr

asp.net-core-2.2