如何让自托管signalR服务器作为NetCore控制台应用程序运行

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.SignalR;
using Microsoft.Extensions.DependencyInjection;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            var host = new WebHostBuilder()
                .UseKestrel()
                .UseStartup<Startup>()
                .Build();

            host.Run();
        }
    }

    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddSignalR();
        }

        public void Configure(IApplicationBuilder app)
        {
            app.UseRouting();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapHub<ChatHub>("/chat");
            });
        }
    }

    public class ChatHub : Hub
    {
        public void SendMessage(string user, string message)
        {
            Clients.All.SendAsync("ReceiveMessage", user, message);
        }
    }
}