netcore_RegisterStartupServices.cs

public static class RegisterStartupServices
{
    public static WebApplicationBuilder RegisterServices(this WebApplicationBuilder builder)
    {
        builder.Services.AddControllers();
        // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
        builder.Services.AddEndpointsApiExplorer();
        builder.Services.AddSwaggerGen();
        return builder;
    }
}