AutoMapper -通过接口重用映射
本文关键字:映射 接口 -通 AutoMapper | 更新日期: 2023-09-27 18:02:02
我有一个基类和各种派生类,我想使用AutoMapper将它们映射到TPH结构中的EF实体。
示例,假设我有以下简单模型:
public abstract class VehicleBase
{
public readonly VehicleType VehicleType;
public readonly int NumWheels;
protected VehicleBase(VehicleType vehicleType, int numWheels)
{
this.VehicleType = vehicleType;
this.NumWheels = numWheels;
}
public int Id { get; set; }
public int PolicyId { get; set; }
public int Year { get; set; }
public string Make { get; set; }
public string Model { get; set; }
}
public class Cycle : VehicleBase
{
public Cycle()
: base(VehicleType.Cycle, 2)
{
}
public bool HasJetKit { get; set; }
}
public class Truck : VehicleBase, IHasAntiLockBrakeSystem
{
public Truck()
: base(VehicleType.Truck, 4)
{
}
public AntiLockBrakeSystem AntiLockBrakeSystem { get; set; }
public bool AntiLockBrakeSystemIsStandard { get; set; }
public bool IsCrewCab { get; set; }
}
public class Car : VehicleBase, IHasAntiLockBrakeSystem
{
public Car()
: base(VehicleType.Car, 4)
{
}
public AntiLockBrakeSystem AntiLockBrakeSystem { get; set; }
public bool AntiLockBrakeSystemIsStandard { get; set; }
public int NumDoors { get; set; }
}
public class AntiLockBrakeSystem
{
public int SomeValue { get; set; }
}
public interface IHasAntiLockBrakeSystem
{
AntiLockBrakeSystem AntiLockBrakeSystem { get; set; }
bool AntiLockBrakeSystemIsStandard { get; set; }
}
public enum VehicleType
{
UNDEFINED = 0,
Car = 1,
Truck = 2,
Cycle = 3
}
是否有任何方法可以使用IHasAntiLockBrakeSystem这样的接口,让AutoMapper映射该接口的属性,而不必为实现该接口的每个类映射它们?明白了吗?
我开始了这条路:
AutoMapper.Mapper.CreateMap<DomainModel.VehicleBase, DalModel.Vehicle>()
.ForMember(dst => dst.VehicleTypeId, opt => opt.MapFrom(src => (byte)src.VehicleType))
.ForMember(dst => dst.NumWheels, opt => opt.MapFrom(src => (byte)src.NumWheels))
// include derived mappings
.Include<DomainModel.Car, DalModel.Vehicle>()
.Include<DomainModel.Truck, DalModel.Vehicle>()
.Include<DomainModel.Cycle, DalModel.Vehicle>()
AutoMapper.Mapper.CreateMap<DomainModel.Car, DalModel.Vehicle>()
.ForMember(dst => dst.NumDoors, opt => opt.MapFrom(src => (byte)src.NumDoors))
.Include<DomainModel.IHasAntiLockBrakeSystem, DalModel.Vehicle>();
AutoMapper.Mapper.CreateMap<DomainModel.Truck, DalModel.Vehicle>()
.Include<DomainModel.IHasAntiLockBrakeSystem, DalModel.Vehicle>();
AutoMapper.Mapper.CreateMap<DomainModel.Cycle, DalModel.Vehicle>();
但是我得到一个编译错误尝试与映射:
.Include<DomainModel.IHasAntiLockBrakeSystem, DalModel.Vehicle>();
类型'AutoMapperTesting.DomainModel。IHasAntiLockBrakeSystem'不能用作泛型类型或方法'AutoMapper.IMappingExpression.Include()'中的类型参数'TOtherSource'。没有从"AutoMapperTesting.DomainModel"的隐式引用转换。IHasAntiLockBrakeSystem' to 'AutoMapperTesting.DomainModel.Car'.
EF5生成的实体如下:
public partial class Vehicle
{
public int Id { get; set; }
public int PolicyId { get; set; }
public byte VehicleTypeId { get; set; }
public byte NumWheels { get; set; }
public Nullable<bool> HasJetKit { get; set; }
public Nullable<bool> IsCrewCab { get; set; }
public Nullable<byte> NumDoors { get; set; }
public virtual AntiLockBrakeSystem AntiLockBrakeSystem { get; set; }
public virtual Policy Policy { get; set; }
public virtual VehicleType VehicleType { get; set; }
}
public partial class AntiLockBrakeSystem
{
public int VehicleId { get; set; }
public int SomeValue { get; set; }
public bool IsStandard { get; set; }
public virtual Vehicle Vehicle { get; set; }
}
我没有看到你所说的"Vehicle"类中直接有什么,但是你可以创建一个类似特征的映射,并省略任何你不想要的。
Mapper.CreateMap<VehicleBase, Vehicle>()
.ForMember(dest => dest.firstProp, opt => opt.MapFrom(source => source.FirstProp))
.ForMember(dest => dest.secondProp, opt => opt.MapFrom(source => source.secondProp))
如果您省略了特定于其他类和接口的属性,它将不会尝试映射它们