AutoMapper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公开了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())

我要实现的是唯一机会的列表，每个机会将有一个嵌套的成员，该成员将具有报价单。如何使自动映射器执行此分组？现在，从api返回的契机Dto的Quotations成员始终为空。

Answer 1

AutoMapper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进行映射，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);
    }

输出为

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
    }
  ]
}

Answer 2

@Afflatus我想给你一个可以遵循的想法。我假设您基于服务变量使用AspNetCore。

您可以创建像这样的扩展方法，以稍后在services.RegisterMappingsWithAutomapper()之类的ConfigurationServices上进行调用：

public static IServiceCollection RegisterMappingsWithAutomapper(this IServiceCollection services)
{
   var mapperConfig = AutoMapperHelper.InitializeAutoMapper();
   services.AddScoped<IMapper>(provider => new Mapper(mapperConfig));
   return services;
}

InitializeAutoMapper如下：

public static class AutoMapperHelper
{
    public static MapperConfiguration InitializeAutoMapper()
    {
        //Load here all your assemblies
        var allClasses = AllClasses.FromLoadedAssemblies();

        MapperConfiguration config = new MapperConfiguration(cfg =>
        {
            if (allClasses != null)
            { 
                //here normally I add another Profiles that I use with reflection, marking my DTOs with an interface
                cfg.AddProfile(new MappingModelsAndDtos(allClasses));
                cfg.AddProfile(new MyCustomProfile());
            }
        });

        return config;
    }
}

现在您需要实施配置文件，在本例中为MyCustomProfile

public class ModelProfile : Profile
{
    public ModelProfile()
    {
        //put your source and destination here
        CreateMap<MySource, MyDestination>()
                .ConvertUsing<MySourceToMyDestination<MySource, MyDestination>>();
    }
}

然后您需要实现MySourceToMyDestination类。贝娄是我在项目中如何使用它的代码示例

public class ApplicationModel2ApplicationDto : ITypeConverter<ApplicationModel, ApplicationDto>
{
    public ApplicationDto Convert(ApplicationModel source, ApplicationDto destination, ResolutionContext context)
    {
        var mapper = context.Mapper;
        try
        {
            destination = new ApplicationDto
            { 
                ApplicationId = source.ApplicationId,
                ApplicationName = source.ApplicationName,
                Documents = mapper.Map<IEnumerable<DocumentDto>>(source.Documents),
                Tags = mapper.Map<IEnumerable<TagInfoDto>>(source.TagInfos)
            };
        }
        catch
        {
            return null;
        }

        return destination;
    }
}

希望这会有所帮助

用于映射数据的自动映射器配置

2 个答案:

AutoMapper配置

测试

测试输出