自动映射:dto对象的自动映射集合属性

时间:2012-11-20 17:57:02

标签: automapper

我有一个域对象

public class ProductModel
{
    public long Id {get;set;}
    public string Name {get;set;}
    public string SerialNumber {get;set;}
}

Single Dto class:

public class ProductDto
{
    public long Id {get;set;}
    public string Name {get;set;}
    public string SerialNumber {get;set;}
}

单个Dto类,它是Dto对象的列表:

public class ProductListDto : List<ProductDto>
{
    public List<ProductDto> Products;

    public ProductListDto()
    {
        Products = new List<ProductDto>();
    }
}

我想将域对象列表映射到Dto对象列表,以便ProductListDto对象AUTOMATICALLY的“Products”属性与ProductModel对象列表一起映射:

ProductListDto dto = new ProductListDto();  

Mapper.CreateMap<ProductModel, ProductDto>();

/* dto = (ProductListDto) Mapper.Map<List<ProductModel>, List<ProductDto>>((List<ProductModel>)model);  this code line causes error. It is commented out. */ 

dto.Products = Mapper.Map<List<ProductModel>, List<ProductDto>>((List<ProductModel>)model);  // (*)  works OK but need to specify "Products" property

代码行(*)工作正常,但我想知道是否有另一种方法可以自动(隐式)映射除代码行(*)之外的dto对象的“Products”属性?

这意味着我不必像代码行(*)的左侧那样编写代码。

1 个答案:

答案 0 :(得分:11)

您需要为其创建映射。这样的事情应该有效:

namespace StackOverflow
{
    using System.Collections.Generic;

    using AutoMapper;

    public class MyProfile : Profile
    {
        public override string ProfileName
        {
            get
            {
                return "MyProfile";
            }
        }

        protected override void Configure()
        {
            Mapper.CreateMap<ProductModel, ProductDto>();

            Mapper.CreateMap<List<ProductModel>, ProductListDto>()
                .ForMember(dest => dest.Products,
                           opt => opt.MapFrom(
                               src => Mapper.Map<List<ProductModel>,
                                                 List<ProductDto>>(src)));
        }
    }
}

然后在你的代码中你可以这样做:

dto = Mapper.Map<List<ProductModel>, ProductListDto>((List<ProductModel>)model);

以下是一些单元测试,以展示它的工作原理:

namespace StackOverflow
{
    using System.Collections.Generic;

    using AutoMapper;

    using NUnit.Framework;

    [TestFixture]
    public class MappingTests
    {
        [Test]
        public void AutoMapper_Configuration_IsValid()
        {
            Mapper.Initialize(m => m.AddProfile<MyProfile>());
            Mapper.AssertConfigurationIsValid();
        }

        [Test]
        public void AutoMapper_DriverMapping_IsValid()
        {
            Mapper.Initialize(m => m.AddProfile<MyProfile>());
            Mapper.AssertConfigurationIsValid();

            var products = new List<ProductModel>
                {
                    new ProductModel
                        {
                            Id = 1,
                            Name = "StackOverflow Rocks",
                            SerialNumber = "1234"
                        },
                    new ProductModel
                        {
                            Id = 2,
                            Name = "I Also Rock",
                            SerialNumber = "4321"
                        }
                };

            var productsDto =
                    Mapper.Map<List<ProductModel>, ProductListDto>(products);

            Assert.That(productsDto, Is.Not.Null);
            Assert.That(productsDto.Products, Is.Not.Null);
            Assert.That(productsDto.Products.Count, Is.EqualTo(2));
        }
    }
}
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