c# - 用于对数据进行分组的自动映射器配置

Question

我有以下型号

来源:

public class Opportunity
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public Guid QuotationId { get; set; }
    public int? QuotationNumber { get; set; }
    public int? QuotationVersionNumber { get; set; }
}

目标:

public class OpportunityDto
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public List<QuotationDto> Quotations { get; set; }
}

public class QuotationDto
{
    public Guid Id { get; set; }
    public int Number { get; set; }
    public int VersionNumber { get; set; }
}

我从数据库中获取的数据将与 Opportunity 模型保持一致，并且我的 api 正在公开 OpportunityDto 模型。因此，在我的自动映射器配置中，我有以下代码:

services
    .AddSingleton(new MapperConfiguration(cfg =>
    {
        cfg.CreateMap<OpportunityDto, Opportunity>().ReverseMap();
        cfg.CreateMap<QuotationDto, Quotation>().ReverseMap();
    }).CreateMapper())

我想要实现的是一个独特机会的列表，每个机会都有一个嵌套成员，其中包含报价列表。如何让自动映射器执行此分组？现在，从 api 返回的 opportunityDto 的 Quotations 成员始终为空。

Answer 1

自动映射器配置

您可以执行以下操作:

    public static void InitialiseMapper()
    {
        Mapper.Initialize(cfg =>
        {
            cfg.CreateMap<IEnumerable<Opportunity>, OpportunityDto>()
                .ForMember(x => x.Id, x => x.MapFrom(y => y.FirstOrDefault().Id))
                .ForMember(x => x.Name, x => x.MapFrom(y => y.FirstOrDefault().Name))
                .ForMember(x => x.Quotations,
                    x => x.MapFrom(y => Mapper.Map<IEnumerable<Opportunity>, IEnumerable<QuotationDto>>(y).ToArray()))
                ;

            cfg.CreateMap<Opportunity, QuotationDto>()
                .ForMember(x => x.Id, x => x.MapFrom(y => y.QuotationId))
                .ForMember(x => x.Number, x => x.MapFrom(y => y.QuotationNumber))
                .ForMember(x => x.VersionNumber, x => x.MapFrom(y => y.QuotationVersionNumber))
                ;
        });
    }

测试

然后成功地知道如何映射，如以下测试所示:

    [TestMethod]
    public void TestMethod1()
    {
        var oppo1Guid = Guid.NewGuid();

        var opportunities = new List<Opportunity>
        {
            new Opportunity
            {
                Id = oppo1Guid,
                Name = "Mikeys Oppurtunity",
                QuotationId = Guid.NewGuid(),
                QuotationNumber = 169,
                QuotationVersionNumber = 80,
            },

            new Opportunity
            {
                Id = oppo1Guid,
                Name = "Mikeys Oppurtunity",
                QuotationId = Guid.NewGuid(),
                QuotationNumber = 170,
                QuotationVersionNumber = 20,
            }
        };

        var dtos = Mapper.Map<IEnumerable<Opportunity>, OpportunityDto>(opportunities);

        var json = JsonConvert.SerializeObject(dtos, Formatting.Indented);

        Console.WriteLine(json);
    }

输出是

测试输出

{
  "Id": "623c17df-f748-47a2-bc7e-35eb124dbfa3",
  "Name": "Mikeys Oppurtunity",
  "Quotations": [
    {
      "Id": "ad8b31c2-6157-4b7f-a1f2-9f8cfc1474b7",
      "Number": 169,
      "VersionNumber": 80
    },
    {
      "Id": "515aa560-6a5b-47da-a214-255d1815e153",
      "Number": 170,
      "VersionNumber": 20
    }
  ]
}