SignalR implementation in ASP.NET Core Application using .NET Client to receive message.

satya karki 986 MVP

I am following the below article for implementing SignalR in my ASP.NET Core web application to receive messages from Server. Initially, it was working and able to receive the message from the SignalR server Hub but after a few days, it is not receiving messages. I tried to search for other related documents too however, couldn't get resources or samples related to ASP.NET core. Even the below document is for WinForm not for ASP.NET Core.

https://learn.microsoft.com/en-us/aspnet/core/signalr/dotnet-client?view=aspnetcore-6.0&tabs=visual-studio

Similarly, I tried using SignalR Javascript Client and it is working fine. I need to implement it using .NET Client from the backend, not the Front end.

Zhi Lv - MSFT 32,016 Reputation points Microsoft Vendor

2022-04-11T05:38:53.597+00:00
Initially, it was working and able to receive the message from the SignalR server Hub but after a few days, it is not receiving messages.

Is there any error or exception? Try to use logging in asp.net core and collect the error? Besides, you could also use F12 developer tools to check if has any error?

I need to implement it using .NET Client from the backend, not the Front end.

To send message from backend, we need to use IHubContext, see Send messages from outside a hub. Code like this:

public class HomeController : Controller { private readonly IHubContext<NotificationHub> _hubContext; public HomeController(IHubContext<NotificationHub> hubContext) { _hubContext = hubContext; } public async Task<IActionResult> Index() { await _hubContext.Clients.All.SendAsync("Notify", $"Home page loaded at: {DateTime.Now}"); return View(); } }