使用AutoMapper映射两个不同类型的集合

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));

我的问题是我不知道如何映射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映射来映射它们。

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

然而，Automapper似乎无法进行映射。。。我错过了什么？我是否必须再次使用.ConvertUsing()函数？

Answer 1

我真的无法重现这个问题，但下面的操作似乎和预期的一样。AutoMapper应该能够在没有特殊设置的情况下处理集合：

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

看这把小提琴示范一下。