Automapper：DTO内部的DTO集合未映射

Question

我目前有以下型号：

public partial class Observation
    {
        public Observation()
        {
            Answers = new HashSet<Answers>();
            ObservedEmployee = new HashSet<ObservedEmployee>();
        }

        public int ObservationId { get; set; }
        public int WorkgroupId { get; set; }
        public int LocationId { get; set; }
        public int ObservationTypeId { get; set; }
        public string WorkstationCode { get; set; }
        public string ObservationNotes { get; set; }
        public DateTime CreatedDatetime { get; set; }
        public int CreatedById { get; set; }
        public int? UpdatedById { get; set; }
        public DateTime? UpdatedDatetime { get; set; }
        public bool IsDeleted { get; set; }

        public virtual Location Location { get; set; }
        public virtual ObservationType ObservationType { get; set; }
        public virtual Workgroup Workgroup { get; set; }
        public virtual Workstation WorkstationCodeNavigation { get; set; }
        public virtual ICollection<Answers> Answers { get; set; }
        public virtual ICollection<ObservedEmployee> ObservedEmployee { get; set; 
    }
}


public partial class Answers
    {
        public int AnswerId { get; set; }
        public int ObservationId { get; set; }
        public int QuestionId { get; set; }
        public int OptionId { get; set; }
        public int? SubOptionId { get; set; }

        public virtual Observation Observation { get; set; }
        public virtual OptionCatalog Option { get; set; }
        public virtual QuestionCatalog Question { get; set; }
        public virtual SubOptionCatalog SubOption { get; set; }
    }

以及相应的DTO

public class ObservationDTO
{
    public int ObservationId { get; set; }
    public int WorkgroupId { get; set; }
    public int LocationId { get; set; }
    public int ObservationTypeId { get; set; }
    public string WorkstationCode { get; set; }
    public string ObservationNotes { get; set; }
    public DateTime CreatedDatetime { get; set; }
    public int CreatedById { get; set; }
    public int? UpdatedById { get; set; }
    public DateTime? UpdatedDatetime { get; set; }
    public bool IsDeleted { get; set; }
    public ICollection<AnswersDTO> Answers { get; set; }
    public ICollection<ObservedEmployeeDTO> ObservedEmployee { get; set; }
    public WorkgroupDTO Workgroup { get; set; }

}

public class AnswersDTO
    {
        public int AnswerId { get; set; }
        public int ObservationId { get; set; }
        public int QuestionId { get; set; }
        public int OptionId { get; set; }
        public int? SubOptionId { get; set; }
        public string QuestionText { get; set; }
        public string OptionText { get; set; }
        public string SubOptionText { get; set; }
    }

当我将观察值映射到ObservationDTO时，我希望ICollection是ICollection。考虑到这一点，我进行了以下映射

cfg.CreateMap<Answers, AnswersDTO>()
            .ForMember(dest => dest.QuestionText, opt => opt.MapFrom(src => src.Question.QuestionText))
            .ForMember(dest => dest.OptionText, opt => opt.MapFrom(src => src.Option.OptionText))
            .ForMember(dest => dest.SubOptionText, opt => opt.MapFrom(src => src.SubOption.SubOptionText));
        cfg.CreateMap<Observation, ObservationDTO>()
            .ReverseMap();

在这里我称为映射，下面是服务调用的代码

public IEnumerable<ObservationDTO> GetUserObservations(int id)
    {
        var observations = _observations.GetUserObservations(id);
        return _mapper.Map<IEnumerable<ObservationDTO>>(observations);
    }

public IEnumerable<Observation> GetUserObservations(int id)
        {
            DateTime date = DateTime.Now.AddYears(-1);
            date = new DateTime(date.Year, date.Month, 1, 0, 0, 0);
            return _context.Observation
                .Where(obs => obs.CreatedById == id && obs.CreatedDatetime >= date)
                .Include(i => i.Answers)
                .Include(i => i.Workgroup)
                .ToList();
        }

这是我从后端得到的响应

{
"observationId": 11,
"workgroupId": 1,
"locationId": 1,
"observationTypeId": 1,
"workstationCode": "DFW",
"observationNotes": "I would enter notes here if I had any.",
"createdDatetime": "2019-01-30T17:19:27",
"createdById": 30633,
"updatedById": null,
"updatedDatetime": null,
"isDeleted": false,
"answers": [
  {
    "answerId": 1,
    "observationId": 11,
    "questionId": 3,
    "optionId": 1,
    "subOptionId": 2,
    "questionText": null,
    "optionText": null,
    "subOptionText": null
  }
]
}

我的问题是，当前，当我将此DTO退还给我时，所有ForMember添加项都为空。这些条目的文本确实具有值，所以我知道它无法正常工作。这使我假设Collection没有被映射。我对这个工具还很陌生，但是我对这个问题（包括文档）进行了至少4-5个小时的研究，我有些迷茫。我不确定是否错过了必要的包含（我已经尝试过所有我能想到的）或我的映射配置不正确。如果有人对这个问题有任何想法或指导，将不胜感激。