Automapper - 无法映射嵌套对象/集合

Question

我在这里和 automapper wiki 尝试了许多示例，但我仍然无法解决此问题。我正在尝试映射嵌套对象和嵌套集合，无论我做什么，它总是会引发错误。让控制器返回数据的唯一方法是为这两个属性打开 option.ignore。

这些是我要映射的业务层对象

public class LocationBL
{
    public int Id { get; set; }        
    public string Name { get; set; }
    public string Address { get; set; }
    public string Address2 { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string Zipcode { get; set; }
    public string Country { get; set; }

    public DbGeography Coordinates { get; set; }

    public int LocationType_Id { get; set; }

    public virtual LocationTypeBL LocationType { get; set; }

    public virtual ICollection<SportBL> Sports { get; set; }
}

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

    public virtual ICollection<LocationBL> Locations { get; set; }
}
public class SportBL
{

    public int Id { get; set; }

    public string Name { get; set; }

    public virtual ICollection<LocationBL> Locations { get; set; }

    public virtual ICollection<UserBL> Users { get; set; }
}

这些是数据层对象

public class Location : EntityData
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    [ForeignKey("Company")]
    public int? CompanyId { get; set; }

    [Required]
    public string Name { get; set; }
    public string Address { get; set; }
    public string Address2 { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string Zipcode { get; set; }
    public string Country { get; set; }
    [Required]
    public DbGeography Coordinates { get; set; }
    [ForeignKey("LocationType")]
    public int LocationType_Id { get; set; }

    public virtual LocationType LocationType { get; set; }

    public virtual ICollection<Sport> Sports { get; set; }
    public virtual Company Company { get; set; }
}

public class LocationType : EntityData
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    public string Name { get; set; }

    public virtual ICollection<Location> Locations { get; set; }
}

public class Sport : EntityData
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    [Required]
    public string Name { get; set; }

    public virtual ICollection<Location> Locations { get; set; }

    public virtual ICollection<User> Users { get; set; }
}

这是我的映射配置文件

public class LocationProfile : Profile
{
    public LocationProfile()
    {
        CreateMap<LocationType, LocationTypeBL>();
        CreateMap<LocationTypeBL, LocationType>();
        CreateMap<Location, LocationBL>()
            .ForMember(Dest => Dest.Sports,
            opt => opt.MapFrom(src => src.Sports))
            .ForMember(Dest => Dest.LocationType,
            opt => opt.MapFrom(src => src.LocationType));

        CreateMap<LocationBL, Location>()
            .ForMember(Dest => Dest.Sports,
            opt => opt.MapFrom(src => src.Sports))
            .ForMember(Dest => Dest.LocationType,
            opt => opt.MapFrom(src => src.LocationType));




    }
}

更新 ******* 这是我的 LocationType 个人资料

public class LocationTypeProfile : Profile
{
    public LocationTypeProfile()
    {
        CreateMap<LocationType, LocationTypeBL>();
        CreateMap<LocationTypeBL, LocationType>();
    }
}

这是我的运动资料

    public class SportProfile : Profile
{
    public SportProfile()
    {
        CreateMap<Sport, SportBL>();
        CreateMap<SportBL, Sport>();
    }
}

不确定是否重要，但这是使用 Autofac、WebAPI 和 OWIN 的 Azure 移动应用后端。这是我第一次使用 AutoMapper 和 Autofac，所以请原谅我，因为我还在学习。配置文件都已注册，如果我将嵌套对象设置为忽略，控制器会返回正确的数据。

提前谢谢你！！！

Answer 1

你快到了。您还需要指导 AutoMapper 如何映射嵌套对象。所以你需要为Sport 到SportBL 创建一个映射，反之亦然。

// use ForMember if needed, but you know how to do that so I won't
// show it.
CreateMap<Sport, SportBL>(); 

然后 AutoMapper 将在映射嵌套复杂类型时使用该映射。

另外注意，如果你的类有相同的属性，你可以调用ReverseMap()方法，它会为你做双向映射。

所以不要这样：

CreateMap<LocationType, LocationTypeBL>();
CreateMap<LocationTypeBL, LocationType>();

你可以这样做来完成同样的事情：

Mapper.CreateMap<LocationType, LocationTypeBL>().ReverseMap();