[英]Automapper: How to not repeat mapping config from complex type to base class
我有一堆從此CardBase
繼承的DTO類:
// base class
public class CardBase
{
public int TransId {get; set; }
public string UserId { get; set; }
public int Shift { get; set; }
}
// one of the concrete classes
public class SetNewCardSettings : CardBase
{
// specific properties ...
}
在我的MVC項目我有一堆與視圖模型的AuditVm
復雜類型,它具有相同的屬性CardBase
:
public class AuditVm
{
public int TransId {get; set; }
public string UserId { get; set; }
public int Shift { get; set; }
}
public class CreateCardVm : CardVm
{
// specific properties here ...
public AuditVm Audit { get; set }
}
這些視圖模型不能從AuditVm
繼承,因為它們每個都已經有一個父視圖。 我以為可以像下面那樣設置映射,因此CardBase
為每個將AuditVm
作為復雜類型的視圖模型指定從AuditVm
到CardBase
的映射。 但這是行不通的。 如何正確地將復雜類型映射到具有基類屬性的扁平類型?
Mapper.CreateMap<AuditorVm, CardBase>()
.Include<AuditorVm, SetNewCardSettings>();
// this does not work because it ignores my properties that I map in the second mapping
// if I delete the ignore it says my config is not valid
Mapper.CreateMap<AuditorVm, SetNewCardSettings>()
.ForMember(dest => dest.Temp, opt => opt.Ignore())
.ForMember(dest => dest.Time, opt => opt.Ignore());
Mapper.CreateMap<CreateCardVm, SetNewCardSettings>()
// this gives me an error
.ForMember(dest => dest, opt => opt.MapFrom(src => Mapper.Map<AuditorVm, SetNewCardSettings>(src.Auditor)));
// I also tried this and it works, but it does not map my specific properties on SetNewCardSettings
//.ConvertUsing(dest => Mapper.Map<AuditorVm, SetNewCardSettings>(dest.Auditor));
更新:這是小提琴https://dotnetfiddle.net/iccpE0
.Include
適用於非常特殊的情況-您有兩個要映射的結構相同的類層次結構,例如:
public class AEntity : Entity { }
public class BEntity : Entity { }
public class AViewModel : ViewModel { }
public class BViewModel : ViewModel { }
Mapper.CreateMap<Entity, ViewModel>()
.Include<AEntity, AViewModel>()
.Include<BEntity, BViewModel>();
// Then map AEntity and BEntity as well.
因此,除非您遇到這種情況, .Include
不是正確的選擇。
我認為您最好的選擇是使用ConstructUsing
:
Mapper.CreateMap<AuditVm, CardBase>();
Mapper.CreateMap<AuditVm, SetNewCardSettings>()
.ConstructUsing(src =>
{
SetNewCardSettings settings = new SetNewCardSettings();
Mapper.Map<AuditVm, CardBase>(src, settings);
return settings;
})
.IgnoreUnmappedProperties();
Mapper.CreateMap<CreateCardVm, SetNewCardSettings>()
.ConstructUsing(src => Mapper.Map<SetNewCardSettings>(src.Audit))
.IgnoreUnmappedProperties();
我還結合了此答案的擴展方法,以忽略所有未映射的屬性。 由於我們使用的是ConstructUsing
,因此AutoMapper不知道我們已經處理了這些屬性。
更新的小提琴: https : //dotnetfiddle.net/6ZfZ3z
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