CODEWITHSUNDEEP
c#signalr
Mike Norgate
Mike Norgate

Reputation: 2431

No clients available in SignalR Hub context

I am new to SignalR and am experimenting with setting up a self host service that I can use to send events to other applications. I am having a problem getting a method to be called on all clients. In the code below _context.Clients.All is always empty. Any Ideas?

Test Method:

var server = new SignalRServer();
server.Start("http://localhost:8555");
var hubConnection = new HubConnection("http://localhost:8555");
var proxy = hubConnection.CreateHubProxy("testHub");
var executed = false;
proxy.On("testMethod", () =>
{
  executed = true;
});
hubConnection.Start().Wait();
var hub = new TestHubContext(GlobalHost.ConnectionManager.GetHubContext<TestHub>());
hub.Test();
hubConnection.Stop();
server.Stop();

Self host server:

public class SignalRServer
{
    private IDisposable _signalR;

    public void Start(string url)
    {
        _signalR = WebApp.Start<SignalRStartup>(url);
    }

    public void Stop()
    {
        _signalR.Dispose();
    }
}

public class SignalRStartup
{
    public static IAppBuilder App = null;

    public void Configuration(IAppBuilder app)
    {
        app.UseCors(CorsOptions.AllowAll);
        app.MapSignalR();
    }
}

Hub:

public class TestHub : Hub
{

}

public class TestHubContext
{
    private IHubContext _context;


    public TestHubContext(IHubContext context)
    {
        _context = context;
    }


    public void Test()
    {
        if (_context != null)
        {
            // At this poing _context.Clients.All is always empty
            _context.Clients.All.testMethod();
        }
    }
}

Upvotes: 4

Views: 2446

Answers (1)

wdavo
wdavo

Reputation: 5110

I think your context / client connections are fine. Without further information I'm guessing your problem is that you are closing your connection and server too quickly after calling hub.Test()

Comment out the two .Stop() calls (and stick a Console.ReadLine in there to keep the console open) and see what happens

Upvotes: 1

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