<script src="~/Scripts/jquery.signalR-2.2.0.min.js"></script>
<script src="@Url.Content("~/signalr/hubs")" type="text/javascript"></script>
<script>
    $(function () {
        var hub = $.connection.payHub;
        hub.client.waitNotify = function (tran, url) {
            console.log("waitNotify:" + tran + "   " + url);
            if (tran) {
                location.href = url;
            }

        };
        $.connection.hub.start().done(function () {
            console.log("hub done");
        });
    })
</script>

[HubName("payHub"), Authorize]
    public class payHub : Hub
    {
        public static Dictionary<Guid, string> userPayHub = new Dictionary<Guid, string>();
        public static void Notify(Guid userId, string redirectUrl)
        {
            if (userPayHub.ContainsKey(userId))
            {
                Microsoft.AspNet.SignalR.GlobalHost.ConnectionManager.GetHubContext<Hubs.payHub>()
                   .Clients.Client(Hubs.payHub.userPayHub[userId])
                   .waitNotify(true, redirectUrl);
            }
        }
        public override Task OnConnected()
        {
            var uid = this.Context.User.Identity.GetUserId();
            userPayHub[uid] = this.Context.ConnectionId;
            return base.OnConnected();
        }
        public override Task OnDisconnected(bool stopCalled)
        {
            var uid = this.Context.User.Identity.GetUserId();
            userPayHub.Remove(uid);
            return base.OnDisconnected(stopCalled);
        }
        public override Task OnReconnected()
        {
            var uid = this.Context.User.Identity.GetUserId();
            userPayHub.Remove(uid);
            return base.OnReconnected();
        }
    }