Question

I´m using SignalR/PersistentConnection, not the Hub.

I want to send a message from the server to client. I have the client id to send it, but how can I send a message from server to the client?

Like, when some event happens on server, we want send a notification to a particular user.

Any ideas?

Answer 1

The github page shows how to do this using PersistentConnections.

public class MyConnection : PersistentConnection {
    protected override Task OnReceivedAsync(string clientId, string data) {
        // Broadcast data to all clients
        return Connection.Broadcast(data);
    }
}

Global.asax

using System;
using System.Web.Routing;
using SignalR.Routing;

public class Global : System.Web.HttpApplication {
    protected void Application_Start(object sender, EventArgs e) {
        // Register the route for chat
        RouteTable.Routes.MapConnection<MyConnection>("echo", "echo/{*operation}");
    }
}

Then on the client:

$(function () {
    var connection = $.connection( echo );

    connection.received(function (data) {
        $( #messages ).append( <li>  + data +  </li> );
    });

    connection.start();

    $("#broadcast").click(function () {
        connection.send($( #msg ).val());
    });
});

Answer 2

May be the AddToGroup function in the helps in Server side

Put the clients in to different channels

public bool Join(string channel)
{
    AddToGroup(channel.ToString()).Wait();
    return true;
}

Then they Can send out message in different channel

public void Send(string channel, string message)
{

    String id = this.Context.ClientId;

    Clients[channel.ToString()].addMessage(message);

}

Answer 3

using SignalR;
using SignalR.Hosting.AspNet;
using SignalR.Infrastructure;

public class MyConnection : PersistentConnection
{
}

public class Notifier
{
  public void Notify(string clientId, object data) {
    MyConnection connection = (MyConnection) AspNetHost.DependencyResolver
      .Resolve<IConnectionManager()
      .GetConnection<MyConnection>();

    connection.Send(clientId, data);
  }
}

https://github.com/SignalR/SignalR/wiki/PersistentConnection

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