Question

I’m trying to get a console application working with the SignalR .Net Client but I’m getting an error when I try to invoke a method on the Hub. Here’s my code for the console app:

static void Main(string[] args)
{            
    var connection = new HubConnection("http://localhost/SignalRTest");
    var myHub = connection.CreateProxy("SignalRTest.Classes.service");

    myHub.On<string>("addMessage", text =>
    {
        Console.WriteLine(text);
    });

    connection.Start().ContinueWith(task =>
    {
        if (task.IsFaulted)
        {   
            Console.WriteLine("There was an error opening the connection: {0}", task.Exception.GetBaseException());
        }
        else {                        
            Console.WriteLine("Connected.");
        }
   }).Wait();


   myHub.Invoke("Send", "Message from console.").ContinueWith(task => {
       if (task.IsFaulted)
       {                
           Console.WriteLine("There was an error calling Send: {0}", task.Exception.GetBaseException());
       }
       else
       {
           Console.WriteLine("Send complete.");
       }

   });


   Console.ReadLine();

}

Here is the Hub from the Server:

[HubName("service")]
public class ServiceHub : Hub
{
    public void Send(string message)
    {
        // Call the addMessage method on all clients
        Clients.addMessage(message);
    }
}

I assume that the console app is connecting correctly because it writes out “Connected.” But when it tries to call the Send method on the server, I get the following error:

System.Net.WebException: The remote server returned an error: (500) Internal Server Error.
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at SignalR.HttpHelper.<>c_DisplayClass2.b_0(IAsyncResult ar)
at System.Threading.Tasks.TaskFactory1.FromAsyncCoreLogic(IAsyncResult iar, Func2 endMethod, TaskCompletionSource`1 tcs)

Can anyone tell me what I’m doing wrong? Thanks.

Answer 1

This issue appears to be caused by using an invalid hub name (when using CreateProxy). It is strange that the start method doesn’t fail but i just tested this and got the same behavior as you using a non-existent hub name.