To send a specific user or users, you need to map user to connection. There are 4 ways you can do this, among them are:
- Iuserid Provider
- In-memory
- Single-user groups
- Database
I’ll give you a basic example of mapping connection using In-memory:
public class ChatHub : Hub
    {
        private readonly static ConnectionMapping<string> _connections = 
            new ConnectionMapping<string>();
        public void Send(string who, string message)
        {
            string name = Context.User.Identity.Name;
            foreach (var connectionId in _connections.GetConnections(who))
            {
                Clients.Client(connectionId).addChatMessage(name + ": " + message);
            }
        }
        public override Task OnConnected()
        {
           //é executado quando a conexão se conecta a esta instância do hub.
        }
        public override Task OnDisconnected(bool stopCalled)
        {
          //é executado quando uma conexão se desconecta desta instância do hub.
        }
        public override Task OnReconnected()
        {
          //é executado quando uma conexão de transporte é automaticamente restabelecida depois de ter sido perdida.
        }
    }
Doc - Mapping Signalr users to connections: Here
Doc - Event handlers: Here
							
							
						 
Are you using Asp ?
– Mauro Alexandre
Yes, if you want I’ll send you the full code
– Andre Neto
I found here at Soen an example that worked for me. http://stackoverflow.com/questions/19522103/signalr-sending-a-message-to-a-specific-user-using-iuseridprovider-new-2-0
– Mauro Alexandre
It didn’t work out here, it’s possible I could use the
$.connection.hub.idfor that reason?– Andre Neto
I use the sign on Asp.net and mobile apps...if the link above does not help me let me know that I help you...
– Almeida
@Andreneto, for you to send a specific user, need to map the user’s connection. Please look at the answer. Anything let me know.
– Matheus Miranda