Lamar with ASP.NET Core 6.0 and controller registration - asp.net-web-api

Question

I am trying to properly structure my ASP.NET Core 6.0 service registrations and therefore would like to move the registration into its own class.
Unfortunately, the code below doesn't work. It seems the controllers are not registered as swagger complains about No operations defined in spec!. If I move the call to registry.AddControllers() back to my ConfigureRegistry method, it works.
What am I doing wrong here?
var builder = WebApplication.CreateBuilder(args);
ConfigureConfiguration(builder.Configuration);
ConfigureRegistry(builder.Host, builder.Configuration);
var app = builder.Build();
ConfigureMiddleware(app, app.Services, app.Environment);
ConfigureEndpoints(app, app.Services, app.Environment);
app.Run();
void ConfigureConfiguration(ConfigurationManager configuration)
{
}
void ConfigureRegistry(ConfigureHostBuilder host, ConfigurationManager config)
{
host.UseLamar((context, registry) =>
{
// registry.AddControllers();
// registry.AddEndpointsApiExplorer();
// registry.AddSwaggerGen();
// registry.AddAutoMapper(typeof(Program));
registry.IncludeRegistry<WebRegistry>();
// ...
registry.IncludeRegistry<ApplicationRegistry>();
registry.IncludeRegistry<InfrastructureRegistry>();
});
}
void ConfigureMiddleware(IApplicationBuilder app, IServiceProvider services, IWebHostEnvironment environment)
{
if (environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}
app.UseHttpsRedirection();
app.UseAuthorization();
app.UseRouting();
}
void ConfigureEndpoints(IEndpointRouteBuilder app, IServiceProvider services, IWebHostEnvironment environment)
{
app.MapControllers();
}
public class WebRegistry : ServiceRegistry
{
public WebRegistry()
{
this.AddControllers();
this.AddEndpointsApiExplorer();
this.AddSwaggerGen();
this.AddAutoMapper(typeof(Program));
For<ICategoryViewService>().Use<CategoryViewService>();
}
}