coincoin

program.cs

using Microsoft.AspNetCore.SignalR.Client;
using System;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        public static async Task Main()
        {
            Console.ReadLine();

            var hubConnection = new HubConnectionBuilder()
                .WithUrl("https://dropme.azurewebsites.net/myHub")
                .Build();

            hubConnection.On<string,string,string>("ReceiveMessage", (a, b, c) =>
            {
                Console.WriteLine($"a : '{a}'");
                Console.WriteLine($"b : '{b}'");
                Console.WriteLine($"c : '{c}'");
            });

            try
            {
                await hubConnection.StartAsync();
            }
            catch (Exception ex)
            {

                Console.WriteLine(ex.ToString());
            }

            Console.ReadLine();
        }
    }
}

project.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.2</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="1.1.0" />
  </ItemGroup>

</Project>