public partial class CoreContext
{
    public CoreContext(
        DbContextOptions<CoreContext> options,
        IUserService userService,
        IAuditRepository auditRepository
        ) : base(options) {...}
}

public partial class CoreContext : DbContext
{
    public CoreContext(DbContextOptions<CoreContext> options) : base(options) {}
}

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

    public static IWebHost BuildWebHost(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .UseStartup<Startup>()
                .Build();
}

public IServiceProvider ConfigureServices(IServiceCollection services)
{
    ...
    services.AddDbContextPool<CoreContext>(options => options.UseSqlServer(absConnectionString));
    ...
}