public interface ICountryAppServiceIPersonAppService : IAsyncCrudAppService<CountryDto>IAppApplicationService<PersonDto, GetAllPeopleDto>
{
}

public class CountryDtoPersonDto : CustomValidateDtoBase
{
    public static PersonDto NullInstance = new PersonDto().AsNullable();

    public string Name { get; set; }

    public override void AddValidationErrors(CustomValidationContext context)enum Error
    {
       if (string.IsNullOrWhiteSpace(Name)) GetAllPeople = 1,
       { GetPerson = 2,
        PostPerson = 3,
       context.Results.Add(new ValidationResult("Name is required"));
 PutPerson = 4,
        DeletePerson = }5
    }
}

[AutoMap(typeof(CountryDto))]
[Table("Countries")]
public class CountryPerson : Entity
{
    public const int MaxNameLength = 256;
    [Required]
    [MaxLength(MaxNameLength)]
    public string Name { get; set; }

    public CountryPerson()
    {
    }

    public CountryPerson(int id, string name)
    {
        Id = id;
        Name = name;
    }

    public enum Error
    {
        PersonNameMustHaveValue = 1
    }
}

public class CountryAppService : AsyncCrudAppService<Country, CountryDto>, ICountryAppService
{
    public CountryAppService(IRepository<Country> repository)
PersonAppService : AppApplicationService, IPersonAppService
{
    private readonly IAppDomainService<Person> _service;

    public PersonAppService(IAppDomainService<Person> service)
    {
    	_service = service;
    }

    public IListDto<PersonDto, int> GetAll(GetAllPeopleDto request)
        => _service.GetAll<PersonDto>(request, p => request.Name.IsNullOrEmpty() || p.Name.Contains(request.Name));

    public PersonDto Get(IRequestDto<int> id)
    {
    	ValidateRequestDto(id, nameof(id));

        if (Notification.HasNotification())
        	return PersonDto.NullInstance;

        var entity = _service.Get(id);
        return entity.MapTo<PersonDto>();
 	}

    public PersonDto Create(PersonDto person)
    {
    	ValidateDto(person, nameof(person));

        if (Notification.HasNotification())
        	return PersonDto.NullInstance;

        var personBuilder = new PersonBuilder(Notification)
     		.WithId(person.Id)
            .WithName(person.Name);

       	person.Id = _service.InsertAndGetId(personBuilder);

        return person;
  	}

    public PersonDto Update(int id, PersonDto person)
    {
    	ValidateDtoAndId(person, id, nameof(person), nameof(id));

        if (Notification.HasNotification())
        	return PersonDto.NullInstance;

        var personBuilder = new PersonBuilder(Notification)
        	.WithId(id)
            .WithName(person.Name);

        _service.Update(personBuilder);

        : base(repositoryperson.Id = id;
        return person;
   }

    public void Delete(int id)
    {
    	ValidateId(id, nameof(id));

        if (Notification.HasNotification())
        	return;

        _service.Delete(id);
   }
}