AspNetCore Startup pattern not working after v0.13.3

[Dionisos94]

Hello,

First of all, thanks for this lib, it's very helpful !

I am using SocketMode.
I updated my version v0.13.3 to v0.14 and since then my code is not working anymore. My app was starting but the connection to Slack couldn't be made and no slack log were shown (even with UseLogger()).

To be sure it wasn't due to any of my other libs, I took your AspNetCore example and made it run. It was working fine.
I then try bit by bit to find what could be the culprit.

I transformed your example from a "Minimal Hosting" program to a "Startup" based one and then it stopped working, exactly like my app.
I found no log that could help.

Here is my change compared to your example:

I changed "Program.cs" to be:

public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
            });
    }

And I added a Startup.cs

public class Startup
    {
        private readonly IConfiguration _configuration;

        public Startup(IConfiguration configuration)
        {
            _configuration = configuration;
        }

        public void ConfigureServices(IServiceCollection services)
        {
            var slackSettings = builder.Configuration.GetSection("Slack").Get<SlackSettings>()!;

            services.AddSlackNet(c => c
                .UseApiToken(slackSettings.ApiToken) // This gets used by the API client
                .UseAppLevelToken(slackSettings.AppLevelToken) // (Optional) used for socket mode
                .UseSigningSecret(slackSettings.SigningSecret)
                .RegisterEventHandler<MessageEvent, PingDemo>()
            );
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            app.UseSlackNet(c => c
                // You can enable socket mode for testing without having to make your web app publicly accessible
                .UseSocketMode(true)
            );

            app.UseRouting();
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapGet("/", () => "Hello, Slack !");
            });
        }
    }

The app starts but it doesn't reply to any slack event.

Any hint ?
Unhappily my app uses this startup pattern as it's a default in my company framework.

Same issue on either Net8 or Net10.
Same issue on either v0.14 or v0.17.9

[Dionisos94]

I actually asked AI and it found the culprit.

"v0.14.0 most likely changed UseSlackNet to do work that requires a fully-built DI container. WebApplication (minimal pattern) has one; IApplicationBuilder in Startup.Configure does not. Try moving socket mode config into AddSlackNet / ConfigureServices."

Or rephrased:
"In Startup pattern the Configure method receives an IApplicationBuilder and, at that point, the IServiceProvider isn't fully built yet"
"In the minimal pattern, app is a WebApplication, which already has a fully buit IServiceProvider"

Basically, I removed the "UseSlackNet" and added an HostedService and it now works in v0.14.0

Let me know if you think that is not a viable solution.