Asp.Net Core包含另一个FK的FK值

Question

我在数据库中有3个模型，3个表（使用EF迁移创建）：

public class Announce {
        public int Id { get; set; }
        public Location Location { get; set;}
        public int LocationId { get; set; }
}

public class Location {   
    public int Id { get; set; }
    public string Name { get; set; }
    public District District { get; set; }
    public string DistrictId { get; set; }
}

public class District {   
    public int Id { get; set; }
    public string Name { get; set; }
}

和Dto类：

public class AnnounceForListDto {
            public int Id { get; set; }            
            public string LocationName { get; set; }
            public string DistrictName{ get; set; }
    }

在AutoMapperProfile中：

CreateMap<District, AnnounceForListDto>()
                .ForMember(dest => dest.DistrictName, opt =>
                {
                    opt.MapFrom(dis => dis.Name);
                }); 

我想宣布：

public async Task<IEnumerable<Announce>> GetAnnounces()
        {
            var announces = await _context.Announce
                    .Include(prop => prop.Photos)
                    .Include(prop => prop.Location)
                    .ToListAsync();
            return announces;
        }

我需要在我的列表中包含区域名称（或区域ID，因为我使用AutoMapper来区分来自AnnounceForNameD的ZoneName与区域名称）。

我尝试了.Include（prop => prop.Location.District.Name），但得到一个错误，“Include只能使用一个”点“）。

也许.ThenInclude(Location => Location.District)这个帮助我错了我的Dto声明？

我的Dto用于控制器：

[HttpGet]
        public async Task<IActionResult> GetAnnounces()
        {
            var announces = await _repo.GetAnnounces();

            var announcesToReturn = _mapper.Map<IEnumerable<AnnounceForListDto>>(announces);

            return Ok(announcesToReturn);
        }

Answer 1

解决：创建位置和区域之间的关系

那么，我的Repo方法：

var announces = await _context.Announce
                    .Include(prop => prop.Photos)
                    .Include(prop => prop.Location)
                        .ThenInclude(prop => prop.District)
                    .ToListAsync();
            return announces;