Sending message to custom group using SignalR

Sending message to custom group using SignalR

By : marbon
Date : November 19 2020, 01:01 AM
Hope this helps SignalR groups work using a publish-subscribe model You will have to synchronize your application groups to the hub groups. When a client connects, load its group name from your dictionary / database and assign it to the hub group. When its group membership changes, update the hub groups accordingly.
Find more information to this over here.
code :

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SignalR: How to create and send message to a group from all connected group?

SignalR: How to create and send message to a group from all connected group?

By : Sara
Date : March 29 2020, 07:55 AM
wish of those help You can monitor which users are connected bu capturing the connectionid, and you can then decide who to send the messages to based on the connected users and their unique identifier.
Theres a good blog post here which shows the idea.
SignalR: requesting cookie before sending each SignalR message

SignalR: requesting cookie before sending each SignalR message

By : Jhay Jhen
Date : March 29 2020, 07:55 AM
Best practice to implement sending message to custom groups in SignalR

Best practice to implement sending message to custom groups in SignalR

By : user3723479
Date : March 29 2020, 07:55 AM
help you fix your problem As you said, enumerating over list of clients serialize message each and every time (and store those serialized messages in internal buffers etc etc). If message is same, this is unnecessary CPU\memory overhead. Clients.Clients(ids) serializes message only once so performance vise, its definitely way to go.
The message delivery logic is not very simple which I could not handle it by using Groups. For example, one message will be delivered to users with some custom property equals to some dynamic value.
Sending Message in SignalR from the Web API

Sending Message in SignalR from the Web API

By : user3563687
Date : March 29 2020, 07:55 AM
help you fix your problem I have created a hub in my Web API. It is very simple: , You have done there or four mistakes.
code :
_hub = new DashboardHub();
_service = new NotifyService(_hub); 
    private readonly IRepository _repo;
    private readonly Helpers.Convert _convert;
    private readonly CoreContext _context;
    private readonly IMapper _mapper;
    private readonly INotifyService _service;
    private readonly IHubContext<DashboardHub> _hubContext

    public MyController(IRepository repo, CoreContext context, IMapper mapper,INotifyService service,IHubContext<DashboardHub> hubContext)
            _convert = new Helpers.Convert(repo, mapper);
            _repo = repo;
            _context = context;
            _mapper = mapper;
            _service = service;
            _hubContext = hubContext;

    public async Task<IActionResult> UpdateStatus(Header header) {

        var returnVal = await _repo.ChangeStatus(header.HeaderId, header.Status);

        headerSummary = _convert.ToReturnStatusHeader( await _repo.GetHeader(header.HeaderId));
        // await _service.SendNotificationAsync(headerSummary);

        await hubContext.Clients.All.SendAsync("ReceiveMessage", headerSummary);

        return Ok(returnVal);
SignalR - Sending a Message from a WCF Project

SignalR - Sending a Message from a WCF Project

By : yongqi
Date : March 29 2020, 07:55 AM
I hope this helps you . The easiest solution is probably to provide an API on your Web Application (use MVC or the new WebAPI) that broadcasts to all connected clients. Any other application (an NT Service, an NUnit test, ...) can call that API if it wants to send a message to the clients.
You can't expect SignalR to do anything if you aren't hosting a Hub either in a Web Application running under IIS, or another application hosting it directly.
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