C# 自动映射对象内的集合

我是一个新的AutoMapper工具，顺便说一句，这是惊人的迄今为止。我在映射模型内的集合和相应的ViewModel对象时遇到了困难

为了简单起见，我对代码进行了裁剪：

型号：

public class VoteQuestion
{        
    public virtual ICollection<VoteAnswerOption> VoteAnswerOptions { get; set; }
}

和相应的视图模型：

public class CreateVoteQuestionViewModel
{        
    public List<VoteAnswerOptionViewModel> PossibleAnswers { get; set; }
}

public class VoteAnswerOptionViewModel
{
    public string Answer { get; set; }
}

在“Startup.cs”中设置我的映射程序。尝试了一些选项后，除了映射集合之外，它对其他所有功能都有效

        Mapper.Initialize(config =>
        {          
            config.CreateMap<VoteAnswerOption, VoteAnswerOptionViewModel>().ReverseMap();

            config.CreateMap<List<VoteAnswerOptionViewModel>, ICollection<VoteAnswerOption>>().ReverseMap();

            config.CreateMap<VoteQuestion, CreateVoteQuestionViewModel>()
            .ForMember(dest => dest.PossibleAnswers, opts => opts.MapFrom(src => src.VoteAnswerOptions))
            .ForMember(dest=>dest.PossibleAnswers,opts=>opts.MapFrom(src=>Mapper.Map<ICollection<VoteAnswerOption>, List<VoteAnswerOptionViewModel>>(src.VoteAnswerOptions)))
            .ReverseMap();
        });

Mapper.Initialize（配置=>
{          
config.CreateMap（）.ReverseMap（）；
config.CreateMap（）.ReverseMap（）；
config.CreateMap（）
.FormMember（dest=>dest.PossibleAnswers，opts=>opts.MapFrom（src=>src.VoteAnswerOptions））
.FormMember（dest=>dest.PossibleAnswers，opts=>opts.MapFrom（src=>Mapper.Map（src.VoteAnswerOptions）））
.ReverseMap（）；
});

最后，我的控制器操作中的映射：

var newQuestion = Mapper.Map<CreateVoteQuestionViewModel, VoteQuestion>(voteQuestion);

var newQuestion=Mapper.Map（voteQuestion）；

---

我遗漏了什么？

此测试通过：请注意，只有当映射很简单且不包含任何

FormMember

调用时，才能使用

ReverseMap（）

public class VoteQuestion {
    public virtual ICollection<VoteAnswerOption> VoteAnswerOptions { get; set; }
}


public class CreateVoteQuestionViewModel {
    public List<VoteAnswerOptionViewModel> PossibleAnswers { get; set; }
}


public class VoteAnswerOption {
    public string Answer { get; set; }
}


public class VoteAnswerOptionViewModel {
    public string Answer { get; set; }
}


[TestFixture]
public class SOTests {
    [Test]
    public void Test_41247396() {
        Mapper.Initialize(config => {
            config.CreateMap<VoteAnswerOption, VoteAnswerOptionViewModel>().ReverseMap();

            config.CreateMap<VoteQuestion, CreateVoteQuestionViewModel>()
                .ForMember(dest => dest.PossibleAnswers, 
                           opts => opts.MapFrom(src => src.VoteAnswerOptions));

            config.CreateMap<CreateVoteQuestionViewModel, VoteQuestion>()
                .ForMember(dest => dest.VoteAnswerOptions, 
                           opts => opts.MapFrom(src => src.PossibleAnswers));

        });

        var voteQuestion = new VoteQuestion {
            VoteAnswerOptions = new List<VoteAnswerOption> {
                new VoteAnswerOption { Answer = "Correct" }
            }
        };

        var newQuestion = Mapper.Map<VoteQuestion, CreateVoteQuestionViewModel>(voteQuestion);
        newQuestion.PossibleAnswers.Count.Should().Be(1);
        newQuestion.PossibleAnswers.Single().Answer.Should().Be("Correct");

        var vm = new CreateVoteQuestionViewModel {
            PossibleAnswers = new List<VoteAnswerOptionViewModel> {
                new VoteAnswerOptionViewModel {Answer = "Spot on"}
            }
        };

        var q = Mapper.Map<CreateVoteQuestionViewModel, VoteQuestion>(vm);
        q.VoteAnswerOptions.Count.Should().Be(1);
        q.VoteAnswerOptions.Single().Answer.Should().Be("Spot on");

    }
}

公共类VoteQuestion{
公共虚拟ICollection VoteAnswerOptions{get；set；}
}
公共类CreateVoteQuestionViewModel{
公共列表可能的应答{get；set；}
}
公共类VoteAnswerOption{
公共字符串答案{get；set；}
}
公共类VoteAnswerOptionViewModel{
公共字符串答案{get；set；}
}
[测试夹具]
公共类考试{
[测试]
公共无效测试41247396（）{
初始化（配置=>{
config.CreateMap（）.ReverseMap（）；
config.CreateMap（）
.ForMember（dest=>dest.PossibleAnswers，
opts=>opts.MapFrom（src=>src.VoteAnswerOptions））；
config.CreateMap（）
.ForMember（dest=>dest.VoteAnswerOptions，
opts=>opts.MapFrom（src=>src.PossibleAnswers））；
});
var voteQuestion=新voteQuestion{
VoteAnswerOptions=新列表{
新建VoteAnswerOption{Answer=“Correct”}
}
};
var newQuestion=Mapper.Map（voteQuestion）；
newQuestion.PossibleAnswers.Count.Should（）为（1）；
newQuestion.PossibleAnswers.Single（）.Answer.Should（）.Be（“正确”）；
var vm=新的CreateVoteQuestionViewModel{
可能的答案=新列表{
新VoteAnswerOptionViewModel{Answer=“现场”}
}
};
var q=Mapper.Map（vm）；
q、 VoteAnswerOptions.Count.Should（）为（1）；
q、 VoteAnswerOptions.Single（）.Answer.Should（）.Be（“现场”）；
}
}

这就是我的想法，我尝试了两个版本，但都不适用于我。令人惊讶的是，这个AutoMapper是一个如此酷的工具；您提供了非常好的解决方案和有用的提示；我理解我做错了什么，并解决了这个问题。谢谢你的帮助。AutoMapper真的很棒。

public class VoteQuestion {
    public virtual ICollection<VoteAnswerOption> VoteAnswerOptions { get; set; }
}


public class CreateVoteQuestionViewModel {
    public List<VoteAnswerOptionViewModel> PossibleAnswers { get; set; }
}


public class VoteAnswerOption {
    public string Answer { get; set; }
}


public class VoteAnswerOptionViewModel {
    public string Answer { get; set; }
}


[TestFixture]
public class SOTests {
    [Test]
    public void Test_41247396() {
        Mapper.Initialize(config => {
            config.CreateMap<VoteAnswerOption, VoteAnswerOptionViewModel>().ReverseMap();

            config.CreateMap<VoteQuestion, CreateVoteQuestionViewModel>()
                .ForMember(dest => dest.PossibleAnswers, 
                           opts => opts.MapFrom(src => src.VoteAnswerOptions));

            config.CreateMap<CreateVoteQuestionViewModel, VoteQuestion>()
                .ForMember(dest => dest.VoteAnswerOptions, 
                           opts => opts.MapFrom(src => src.PossibleAnswers));

        });

        var voteQuestion = new VoteQuestion {
            VoteAnswerOptions = new List<VoteAnswerOption> {
                new VoteAnswerOption { Answer = "Correct" }
            }
        };

        var newQuestion = Mapper.Map<VoteQuestion, CreateVoteQuestionViewModel>(voteQuestion);
        newQuestion.PossibleAnswers.Count.Should().Be(1);
        newQuestion.PossibleAnswers.Single().Answer.Should().Be("Correct");

        var vm = new CreateVoteQuestionViewModel {
            PossibleAnswers = new List<VoteAnswerOptionViewModel> {
                new VoteAnswerOptionViewModel {Answer = "Spot on"}
            }
        };

        var q = Mapper.Map<CreateVoteQuestionViewModel, VoteQuestion>(vm);
        q.VoteAnswerOptions.Count.Should().Be(1);
        q.VoteAnswerOptions.Single().Answer.Should().Be("Spot on");

    }
}