Automapper 链/嵌套 object 映射抛出异常

Question

我在 .NET CORE 5 项目中使用 AutoMapper 版本 10.1.1。我嵌套了 object 我需要映射但无法这样做并得到以下异常，尽管我可以获得第一个 child 的数据映射，在我的情况下 'Enforcements' 但无法访问 child child Object 'Contraventions'

Class 级别 0

 public class SiteContraventionDataView
{
    public int SiteId { get; set; }

    public string SiteName { get; set; }

    public ICollection<EnforcementDataView> Enforcements { get; set; }

}

Child Class 级别 1

public class EnforcementDataView
{
    public int EnforcementId { get; set; }

    public ICollection<ContraventionDataView> Contraventions { get; set; }
}

当我尝试从 child class 上方为 'Contraventions' 设置源时出现错误。我正在尝试使用 lambda 表达式来获取 Contravention object 参考

 .ForMember(dataView => dataView.Enforcements.Select(x=>x.Contraventions), opt => opt.MapFrom(dataModel => GetContraventions(dataModel.Enforcements.ToList())))

自动映射class

public class SiteContraventionsProfile : Profile
{
    public SiteContraventionsProfile()
    {
        CreateMap<Site, SiteContraventionDataView>()
            .ForMember(dataView => dataView.SiteId, opt => opt.MapFrom(dataModel => dataModel.SiteId))
            .ForMember(dataView => dataView.SiteName, opt => opt.MapFrom(dataModel => dataModel.SiteName))
            .ForMember(dataView => dataView.Enforcements, opt => opt.MapFrom(dataModel => dataModel.Enforcements))
            .ForMember(dataView => dataView.Enforcements.Select(x=>x.Contraventions), opt => opt.MapFrom(dataModel => GetContraventions(dataModel.Enforcements.ToList())))
            ;

       
    }

    private List<Contravention> GetContraventions(List<Enforcement> enforcements)
    {
        List<Contravention> contraventions = new List<Contravention>();

        if (enforcements.Any())
        {
            var t1 = enforcements.Select(x => x.EnforcementContraventions);
        }
        
        return contraventions;
    }
}

Answer 1

尝试为 Enforcement 和 Contravention 添加映射：

CreateMap<Enforcement, EnforcementDataView>();
CreateMap<Contravention, ContraventionDataView>();
CreateMap<Site, SiteContraventionDataView>();

Automapper 链/嵌套 object 映射抛出异常

Automapper chain / nested object mapping throw exception

c#

linq

automapper

.net-core

Class 级别 0

Child Class 级别 1

自动映射class