我的業務邏輯 Pet 類中有一個 Model 類。在這個類中，我有一個名為Type的鑒別器屬性（int = 1， 2， 3， ...）最終映射必須是特定派生類的 Dto。我使用 ConstructUsing，但它在 Stack Overflow Exception 上繼續，因為它在基類型映射規則上有一個遞歸。派生的 Dto 類已正確映射，因為它們沒有遞歸。還嘗試了 PreserveReferences（） 沒有運氣using AutoMapper;using System;using System.Collections.Generic;namespace ConsoleAppMapper{ class Program { static void Main(string[] args) { var mapper = new MapperConfiguration(cfg => { cfg.CreateMap<Pet, Dto.Pet>() .PreserveReferences() .ForMember(dst => dst.Name, opt => opt.MapFrom(src => src.PetName)) .ConstructUsing((src, context) => { switch (src.Type) { case 1: return context.Mapper.Map<Pet, Dto.Dog>(src); case 2: return context.Mapper.Map<Pet, Dto.Cat>(src); case 3: return context.Mapper.Map<Pet, Dto.Mouse>(src); default: return context.Mapper.Map<Pet, Dto.Pet>(src); } }) ; cfg.CreateMap<Pet, Dto.Dog>(); cfg.CreateMap<Pet, Dto.Cat>(); cfg.CreateMap<Pet, Dto.Mouse>(); }).CreateMapper(); var pets = new List<Pet> { new Pet { PetName = "Bob", Type = 1 }, new Pet { PetName = "Tom", Type = 2 }, new Pet { PetName = "Jerry", Type = 3 }, new Pet { PetName = "Duffy", Type = 4 }, }; var dtoList = mapper.Map<IEnumerable<Pet>, IEnumerable<Dto.Pet>>(pets); } } public class Pet { public string PetName; public int Type; }}namespace Dto{ public class Pet { public string Name; } public class Dog : Pet { } public class Cat : Pet { } public class Mouse : Pet { }}
1 回答
PIPIONE
TA貢獻1829條經驗 獲得超9個贊
這是我的完整解決方案，它涵蓋了所有映射組合
using AutoMapper;
using System;
using System.Collections.Generic;
namespace ConsoleAppMapper
{
class Program
{
static void Main(string[] args)
{
var mapper = new MapperConfiguration(cfg =>
{
cfg.CreateMap<Pet, Dto.Pet>()
.Include<Pet, Dto.Dog>()
.Include<Pet, Dto.Cat>()
.Include<Pet, Dto.Mouse>()
.ForMember(dst => dst.Name, opt => opt.MapFrom(src => src.PetName))
.ForMember(dst => dst.Description, opt => opt.Ignore())
.ConstructUsing((src, context) =>
{
switch (src.Type)
{
case 1: return context.Mapper.Map(src, new Dto.Dog { }, context);
case 2: return context.Mapper.Map(src, new Dto.Cat { }, context);
case 3: return context.Mapper.Map(src, new Dto.Mouse { }, context);
default: return context.Mapper.Map(src, new Dto.Pet { }, context);
}
})
;
cfg.CreateMap<Pet, Dto.Dog>()
.ForMember(dst => dst.Description, opt => opt.MapFrom(src => "This is a dog"))
;
cfg.CreateMap<Pet, Dto.Cat>()
.ForMember(dst => dst.Description, opt => opt.MapFrom(src => "This is a cat"))
;
cfg.CreateMap<Pet, Dto.Mouse>()
.ForMember(dst => dst.Description, opt => opt.MapFrom(src => "This is a mouse"))
;
}).CreateMapper();
// Test
var pets = new List<Pet>
{
new Pet { PetName = "Bob", Type = 1 },
new Pet { PetName = "Tom", Type = 2 },
new Pet { PetName = "Jerry", Type = 3 },
new Pet { PetName = "Duffy", Type = 4 },
};
// Full mixed collection
var dtoList = mapper.Map<IEnumerable<Pet>, IEnumerable<Dto.Pet>>(pets);
// Single item
var dog = mapper.Map<Pet, Dto.Pet>(pets[0]);
var dog2 = mapper.Map<Pet, Dto.Dog>(pets[0]);
}
}
public class Pet
{
public string PetName;
public int Type;
}
}
namespace Dto
{
public class Pet
{
public string Name;
public string Description;
}
public class Dog : Pet
{
}
public class Cat : Pet
{
}
public class Mouse : Pet
{
}
}
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