AutoMapper-根据条件映射到派生对象

问题描述

我想根据某些属性的值将源类映射到派生的(从抽象的)目标类.

I want to map source class to derived (from abstract) destination classes depend on value of some property.

我有以下源类:

public partial class ApplicationDriver
{
    public virtual ICollection<ApplicationDriverEquipment> Equipments { get; set; }

}

public partial class ApplicationDriverEquipment
{
    public int Id { get; set; }
    [StringLength(256)]
    public string Make { get; set; }
    [StringLength(256)]
    public string Model { get; set; }
    [StringLength(256)]
    public string Year { get; set; }
    [StringLength(256)]
    public string VINNumber { get; set; }
    [StringLength(256)]
    public string PlateNumber { get; set; }
    [StringLength(256)]
    public string CurrentMileage { get; set; }
    [StringLength(256)]
    public string Length { get; set; }
    public string Type { get; set; }

    public int DriverId { get; set; }
    public virtual ApplicationDriver Driver { get; set; }
}

我想映射到以下类，具体取决于Type参数:

I want to map to the following classes, depend on Type parameter:

public class ApplicationDriverDomain
{
    public List<ApplicationDriverEquipmentAbstractDomain> Equipments { get; set; }

}

public abstract class ApplicationDriverEquipmentAbstractDomain
{
    public int Id { get; set; }
    public string Make { get; set; }
    public string Model { get; set; }
    public string Year { get; set; }
    public string PlateNumber { get; set; }
    public string CurrentMileage { get; set; }
    public string Type { get; protected set; }
}

public class ApplicationDriverEquipmentTractorDomain : ApplicationDriverEquipmentAbstractDomain
{
    public ApplicationDriverEquipmentTractorDomain()
    {
        Type = ApplicationDriverEquipmentTypeStaticStringsDomain.Tractor;
    }
    public string VINNumber { get; set; }
}

public class ApplicationDriverEquipmentTrailerDomain : ApplicationDriverEquipmentAbstractDomain
{
    public ApplicationDriverEquipmentTrailerDomain()
    {
        Type = ApplicationDriverEquipmentTypeStaticStringsDomain.Trailer;
    }

    public string Length { get; set; }
}

public class ApplicationDriverEquipmentStraightTruckDomain : ApplicationDriverEquipmentAbstractDomain
{
    public ApplicationDriverEquipmentStraightTruckDomain()
    {
        Type = ApplicationDriverEquipmentTypeStaticStringsDomain.StraightTruck;
    }

    public string VINNumber { get; set; }
    public string Length { get; set; }
}

public class ApplicationDriverEquipmentCargoVanDomain : ApplicationDriverEquipmentAbstractDomain
{
    public ApplicationDriverEquipmentCargoVanDomain()
    {
        Type = ApplicationDriverEquipmentTypeStaticStringsDomain.CargoVan;
    }

    public string VINNumber { get; set; }
    public string Length { get; set; }
}

我尝试这样做:

    ApplicationDriverEquipmentAbstractDomain GetEquipment(Infrastructure.Asset.ApplicationDriverEquipment infrastructure)
    {
        ApplicationDriverEquipmentAbstractDomain result = null;
        var config = new MapperConfiguration(cfg => cfg.AddProfile<AutoMapperApplicationModel>());
        var mapper = config.CreateMapper();

        switch (infrastructure.Type)
        {
            case ApplicationDriverEquipmentTypeStaticStringsDomain.Tractor:
                result = mapper.Map<ApplicationDriverEquipmentTractorDomain>(infrastructure);
                break;

            case ApplicationDriverEquipmentTypeStaticStringsDomain.Trailer:
                result = mapper.Map<ApplicationDriverEquipmentTrailerDomain>(infrastructure);
                break;

            case ApplicationDriverEquipmentTypeStaticStringsDomain.StraightTruck:
                result = mapper.Map<ApplicationDriverEquipmentStraightTruckDomain>(infrastructure);
                break;

            case ApplicationDriverEquipmentTypeStaticStringsDomain.CargoVan:
                result = mapper.Map<ApplicationDriverEquipmentCargoVanDomain>(infrastructure);
                break;

        }

        return result;
    }

        CreateMap<Infrastructure.Asset.ApplicationDriverEquipment, ApplicationDriverEquipmentTractorDomain>();
        CreateMap<Infrastructure.Asset.ApplicationDriverEquipment, ApplicationDriverEquipmentTrailerDomain>();
        CreateMap<Infrastructure.Asset.ApplicationDriverEquipment, ApplicationDriverEquipmentStraightTruckDomain>();
        CreateMap<Infrastructure.Asset.ApplicationDriverEquipment, ApplicationDriverEquipmentCargoVanDomain>();

        CreateMap<Infrastructure.Asset.ApplicationDriverEquipment, ApplicationDriverEquipmentAbstractDomain>()
            .Include<Infrastructure.Asset.ApplicationDriverEquipment, ApplicationDriverEquipmentTractorDomain>()
            .Include<Infrastructure.Asset.ApplicationDriverEquipment, ApplicationDriverEquipmentTrailerDomain>()
            .Include<Infrastructure.Asset.ApplicationDriverEquipment, ApplicationDriverEquipmentStraightTruckDomain>()
            .Include<Infrastructure.Asset.ApplicationDriverEquipment, ApplicationDriverEquipmentCargoVanDomain>()
            .ForMember(dest => dest.Type, opt => opt.ResolveUsing(GetEquipment))
            ;

        CreateMap<Infrastructure.Asset.ApplicationDriver, ApplicationDriverDomain>()
            .ForMember(dest => dest.Equipments, opt => opt.MapFrom(src => src.Equipments));

但我收到一个错误:

推荐答案

已更新:

因此，我相信我了解您的尝试，对不起，我可能会稍微误导您走错了路线.您的流程基本上是区分源对象是什么基础结构类型，然后创建该对象类型.另外，您还需要了解两种不同的Mapper设置方式.

So I believe I understand what you are trying to do, and apologies I may have slightly led you down the incorrect route. You flow is basically to distinguish what infrastructure type the source object is and then create that type of object. Also you need to understand the two different Mapper set up ways.

在代码的第一部分中，您尝试使用Mapper的实例进行设置，然后使用我的使用Mapper.Map的静态样式.我建议始终使用静态样式，以便您能够做一些更动态的方式来提取映射配置文件.

In the first part of your code you are trying to set it up with an instance of the Mapper but then using my Static style of using the Mapper.Map I would recommend always using the static style so that you have the ability to do some more dynamic ways of pulling mapping profiles in.

Mapper.Initialize(cfg => cfg.AddProfile<AutomapperRules>());
var domain = Mapper.Map<Domain.ApplicationDriverEquipmentTractorDomain>(inf);

接下来，您只需要引用从基础源到配置文件中域类型的映射类型即可，即

Next you only need to reference that a mapping type from the underlying source to the domain types in your profile i.e.

CreateMap<ApplicationDriverEquipmentInfrastructure, ApplicationDriverEquipmentTractorDomain>();
CreateMap<ApplicationDriverEquipmentInfrastructure, ApplicationDriverEquipmentTrailerDomain>();
CreateMap<ApplicationDriverEquipmentInfrastructure, ApplicationDriverEquipmentStraightTruckDomain>();
CreateMap<ApplicationDriverEquipmentInfrastructure, ApplicationDriverEquipmentCargoVanDomain>();

然后，您需要做的是从描述ApplicationDriver的映射中调用GetEquipment方法，即

Then what you need to do is to call your GetEquipment method from the mapping that describes the ApplicationDriver i.e.

CreateMap<ApplicationDriver, ApplicationDriverDomain>()
            .ForMember(dest => dest.Equipments, opt => opt.ResolveUsing(x => x.Equipments.Select(GetEquipment)));

private ApplicationDriverEquipmentAbstractDomain GetEquipment(ApplicationDriverEquipmentInfrastructure infrastructure)
    {
        switch (infrastructure.Type)
        {
            case "Tractor":
                return Mapper.Map<ApplicationDriverEquipmentTractorDomain>(infrastructure);
            case "Trailer":
                return Mapper.Map<ApplicationDriverEquipmentTrailerDomain>(infrastructure);
            case "StraightTruck":
                return Mapper.Map<ApplicationDriverEquipmentStraightTruckDomain>(infrastructure);
            case "CargoVan":
                return Mapper.Map<ApplicationDriverEquipmentCargoVanDomain>(infrastructure);
        }
        return null;
    }

示例用法:

Mapper.Initialize(cfg => cfg.AddProfile<AutomapperRules>());

var inf = new ApplicationDriverEquipmentInfrastructure()
{
     CurrentMileage = "mil",
     Length = "123",
     Make = "ccc",
     Model = "15",
     Type = "Tractor",
     VINNumber = "vin"
};

var driver = new ApplicationDriver()
{
     Equipments = new List<ApplicationDriverEquipmentInfrastructure>() {inf}
};

var domain = Mapper.Map<ApplicationDriverDomain>(driver);

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