How to Build a Simple SignalR Console Application with a Server and Client?

SignalR Console App Example

In this article, we'll explore an example of a console application using SignalR to communicate with a .NET hub.

SignalR Setup

Before proceeding, ensure the following SignalR packages are installed in both the server and client applications via NuGet:

• Server: SignalR.Host.Self (version 0.5.2)
• Client: Microsoft.AspNet.SignalR.Client

Server Implementation

Create a console app server with the following code:

using System;
using SignalR.Hubs;

namespace SignalR.Hosting.Self.Samples
{
    class Program
    {
        static void Main(string[] args)
        {
            string url = "http://127.0.0.1:8088/";
            var server = new Server(url);

            server.MapHubs();

            server.Start();

            Console.WriteLine("Server running on {0}", url);

            while (true)
            {
                ConsoleKeyInfo ki = Console.ReadKey(true);
                if (ki.Key == ConsoleKey.X)
                {
                    break;
                }
            }
        }

        [HubName("CustomHub")]
        public class MyHub : Hub
        {
            public string Send(string message)
            {
                return message;
            }

            public void DoSomething(string param)
            {
                Clients.addMessage(param);
            }
        }
    }
}

Client Implementation

In a separate console app client:

using System;
using SignalR.Client.Hubs;

namespace SignalRConsoleApp
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var connection = new HubConnection("http://127.0.0.1:8088/");

            var myHub = connection.CreateHubProxy("CustomHub");

            connection.Start().ContinueWith(task =>
            {
                if (task.IsFaulted)
                {
                    Console.WriteLine("Error opening connection: {0}", task.Exception.GetBaseException());
                }
                else
                {
                    Console.WriteLine("Connected");
                }

            }).Wait();

            myHub.Invoke<string>("Send", "HELLO World ").ContinueWith(task =>
            {
                if (task.IsFaulted)
                {
                    Console.WriteLine("Error calling Send: {0}", task.Exception.GetBaseException());
                }
                else
                {
                    Console.WriteLine(task.Result);
                }
            });

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

            myHub.Invoke<string>("DoSomething", "I'm doing something!!!").Wait();

            Console.Read();
            connection.Stop();
        }
    }
}

Issues and Solutions

Assigning a Hub Name

If you encounter issues with a specific hub name ("test") in your server-side code (e.g., [HubName("test")]), ensure that it doesn't conflict with the HubName attribute in the client-side code. The hub name used in both the server and client must match for proper communication.

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