Getting a list of registered services from DI

GetAllCommandCommands.cs

// This is the thing that does the work, or the "!command" command
public class GetAllCommandsCommand : ICommandMbhToTwitch
{
  public GetAllCommandsCommand(IOptionsSnapshot<List<string>> commandNames)
  {
    var commands = commandNames.Get("CommandNames");

    this.CommandNames = commands;
  }

  public IEnumerable<string> CommandNames { get; set; }

  public string Name  => "command";
  public void Handle(OnChatCommandReceivedArgs args)
  {
    Console.WriteLine(this.CommandNames);
  }
}

Program.cs

public static IHostBuilder CreateHostBuilder(string[] args) => {

// Some clever bits happen here....

  services.AddOptions<List<string>>("CommandNames").Configure<IServiceProvider>((str, svc) =>
  {
    var commandNames = svc.GetServices<ICommandMbhToTwitch>().Select(cmd => cmd.Name);
    str.AddRange(commandNames);
  });

  // Do some more clever stuff with services

  // Register the command that gets all commands
  services.AddScoped<GetAllCommandsCommand>();

  // Finish setup, registration, etc.

}