SignalR client in asp.net - asp.net

Question

I created a server hub in an asp.net application like below
public class Calc : Hub
{
public void CalculateSomething(int a, int b)
{
// start working in a new thread
var task = Task.Factory.StartNew(() => DoCalculate(a, b));
// attach a continuation task to notify
// the client when the work is done
task.ContinueWith(t =>
{
System.Threading.Thread.Sleep(2000);
Clients.addMessage(t.Result);
Caller.notifyCalculateResult(t.Result);
System.Threading.Thread.Sleep(2000);
Caller.notifyCalculateResult("Completed");
Clients.addMessage("Completed");
});
}
private int DoCalculate(int p1, int p2)
{
// do some slow work on the input,
// e.g. call webservice or I/O.
int result = p1 + p2;
//int result = DoSlowWork(p1, p2);
return result;
}
}
Now in another asp.net application I created a client using SiganlR client. But it's not working correctly. I am looking to get data from server as it pushes to client
using System.Threading.Tasks;
using SignalR;
using SignalR.Client;
using SignalR.Client.Hubs;
namespace WebApplication2
{
public partial class _Default : Page
{
protected void Page_Load(object sender, EventArgs e)
{
// Connect to the service
var hubConnection = new HubConnection("http://localhost:3119/");
// Create a proxy to the chat service
var chat = hubConnection.CreateProxy("Calc");
// Print the message when it comes in
chat.On("addMessage", message =>Print(message));
// Start the connection
hubConnection.Start().Wait();
// Send a message to the server
chat.Invoke("CalculateSomething", 1, 2).Wait();
}
private async void Print(object message)
{
Response.Write(message);
}
}
}
The console client application works fine. The main problem is with asp.net beacause it fails to the handle call back from server.

Answer 1

Looks like you calling the server side method wrongly, try this
chat.Invoke("CalculateSomething", 1, 2).ContinueWith(task =>
{
Console.WriteLine("Value from server {0}", task.Result);
});