Automapper 子实体未映射

Question

我正在尝试映射包含默认子实体的父实体。

所以，我有一个 promotion 对象，它有一个 localisedPromotion 对象的集合

我想设置一个特定的localisedPromotion 并将其设置为我的defaultLocalisedPromotion

在我的配置中，我有：

config.CreateMap<LocalisedPromotion, LocalisedPromotionViewModel>()
    .ForMember(dest => dest.LocalisedPromotionId, o => o.MapFrom(src => src.Id));

config.CreateMap<Promotion, PromotionViewModel>()
    .ForMember(dest => dest.DefaultLocalisedPromotion,
               o => o.MapFrom(src => src.LocalisedPromotions
                                        .FirstOrDefault(x => x.CultureId == src.DefaultCultureId)));

所以在我看来，这应该设置DefaultLocalisedPromotion 类型为LocalisedPromotionViewModel 的字段

但该字段始终为空

有没有明显的方法来做我想要实现的目标

Answer 1

我写了一个单元测试，似乎 AutoMapper 代码有效。请查看单元测试并让我知道它是否正确或发布更多代码（尤其是您要映射的类）以便调整测试。

using AutoMapper;
using Xunit;

using System.Linq;
using System.Collections.Generic;

namespace AutoMapperTest
{
    public class LocalisedPromotion
    {
        public int Id;
        public int CultureId;
    }

    public class LocalisedPromotionViewModel
    {
        public int LocalisedPromotionId;
    }

    public class Promotion
    {
        public List<LocalisedPromotion> LocalisedPromotions;
        public int DefaultCultureId;
    }

    public class PromotionViewModel
    {
        public LocalisedPromotionViewModel DefaultLocalisedPromotion;
    }

    public class AutoMapperTest
    {
        [Fact]
        public void Test()
        {
            var theConfig = new MapperConfiguration(config =>
            {
                config.CreateMap<LocalisedPromotion, LocalisedPromotionViewModel>()
                    .ForMember(dest => dest.LocalisedPromotionId, o => o.MapFrom(src => src.Id));

                config.CreateMap<Promotion, PromotionViewModel>()
                    .ForMember(dest => dest.DefaultLocalisedPromotion,
                               o => o.MapFrom(src => src.LocalisedPromotions
                                                        .FirstOrDefault(x => x.CultureId == src.DefaultCultureId)));
            });

            var promotion = new Promotion { DefaultCultureId = 3 };
            promotion.LocalisedPromotions = new List<LocalisedPromotion>() { new LocalisedPromotion() { Id = 1, CultureId = 3 } };

            var result = theConfig.CreateMapper().Map<Promotion, PromotionViewModel>(promotion);

            Assert.NotNull(result.DefaultLocalisedPromotion);
            Assert.Equal(result.DefaultLocalisedPromotion.LocalisedPromotionId, 1);
        }
    }
}