Map 两种不同类型的集合使用AutoMapper

Question

我有一个 DTO 和一个实体，它们都称为QuestionnaireSubmission映射器，如下所示：

public QuestionSubmissionMapper() => this.CreateMap<DTO.QuestionnaireSubmission, QuestionnaireSubmission>()
            .ForMember(d => d.ParticipantId, d => d.MapFrom(s => s.ParticipationId))
            .ForMember(d => d.SurveyVersionId, d => d.MapFrom(s => s.Survey.Version))
            .ForMember(d => d.RespondantAnswers, d => d.MapFrom(s => s.States));

我的问题是我无法弄清楚如何 map s.States of type State[]和RespondantAnswers of type IEnumerable<RespondantAnswer>

我已经在这两个类之间创建了一个 map 到 map 。

 this.CreateMap<State, RespondantAnswer>()
                .ForMember(d => d.QuestionId, d => d.MapFrom(s => s.Subject))
                .ForMember(..)
                .ForMember(..);

但是 Automapper 似乎无法进行映射......我错过了什么？ 我真的必须使用.ConvertUsing() function 吗？

Answer 1

我无法真正重现该问题，但以下似乎按预期工作。 AutoMapper 无需特殊设置即可处理 collections：

var mapper = new MapperConfiguration(cfg => {
    cfg.CreateMap<SourceQuestionnaireSubmission, DestQuestionnaireSubmission>()
        .ForMember(d => d.ParticipantId, d => d.MapFrom(s => s.ParticipationId))
        .ForMember(d => d.SurveyVersionId, d => d.MapFrom(s => s.Survey.Version))
        .ForMember(d => d.RespondantAnswers, d => d.MapFrom(s => s.States));

    cfg.CreateMap<State, RespondantAnswer>()
        .ForMember(d => d.QuestionId, d => d.MapFrom(s => s.QuestionId));

    })
    .CreateMapper();

var source = new SourceQuestionnaireSubmission
{
    ParticipationId = 1,
    Survey = new Survey { Version = 10 },
    States = new []
    {
        new State { QuestionId = 100 },
        new State { QuestionId = 999 }
    }
};
        
var dest = mapper.Map<SourceQuestionnaireSubmission, DestQuestionnaireSubmission>(source);

Console.WriteLine("ParticipantId: {0}", dest.ParticipantId);
Console.WriteLine("SurveyVersionId: {0}", dest.SurveyVersionId);
Console.WriteLine("RespondantAnswers: {0}",
    string.Join(", ", dest.RespondantAnswers.Select(a => a.QuestionId)));

// Output:
// ParticipantId: 1
// SurveyVersionId: 10
// RespondantAnswers: 100, 999

请参阅this fiddle进行演示。