NetCore+AutoMapper多个对象映射到一个Dto对象

一、定义源映射类和被映射类DTO
二、注入AutoMapper
三、配置映射
四、写测试

一、定义源映射对象

为了体现AutoMapper映射特性，在SocialAttribute中的Name属性没有定义在People中，People的Ear属性也不存在与SocialAttribute和PhysicalAttribute中。

代码如下：

    /// <summary>
    /// 身体属性
    /// </summary>
    public class PhysicalAttribute
    {
        public string Eye { get; set; }
        public string Mouth { get; set; }
    }

PhysicalAttribute

    /// <summary>
    /// 社会属性
    /// </summary>
    public class SocialAttribute
    {
        public int Age { get; set; }
        public bool IsMarried { get; set; }
        public string Name { get; set; }
    }

SocialAttribute

    public class PeopleDto
    {
        public string Eye { get; set; }
        public string Mouth { get; set; }
        public string Ear { get; set; }
        public int Age { get; set; }
        public bool IsMarried { get; set; }
    }

PeopleDto

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二、注入AutoMapper

例子中使用的IOC容器是Autofac，不使用Autofac的话，仅用NetCore框架继承的IOC容器也可以实现。

注册AutoMapper必要组件：

    public static class AutoMapperInjection
    {
        public static ContainerBuilder LoadAutoMapper(this ContainerBuilder builder)
        {
            builder.RegisterType<MapperConfigurationExpression>().SingleInstance();
            builder.Register(m => {
                var mapperConfigurationExpression = m.Resolve<MapperConfigurationExpression>();
                var instance = new MapperConfiguration(mapperConfigurationExpression);
                return instance;
            });
            builder.Register(m => {
                var mapperConfiguration = m.Resolve<MapperConfiguration>();
                return mapperConfiguration.CreateMapper();
            });
            return builder;
            
        }
    }

三、配置映射

ForMember：映射两个类之间的属性关系。

People类中的Ear属性并不存在于任何映射源类中，我们可以使用ForMember(m => m.Ear, n => n.Ignore())忽略该属性，当然也可以不写这段代码，对AutoMapper不会有任何影响，但是为了后期维护更方便，我比较习惯将Dto类的属性写全。

SocialAttribute类中的Name属性不存在与People类中，直接忽略它，Name也不会被AutoMapper赋值。

    public class AutoMapperProfile: Profile
    {
        public void Mapping(ILifetimeScope scope) {

            var expression = scope.Resolve<MapperConfigurationExpression>();
            expression.CreateMap<PhysicalAttribute, PeopleDto>()
            .ForMember(m => m.Eye, n => n.MapFrom(s => s.Eye))
            .ForMember(m => m.Mouth, n => n.MapFrom(s => s.Mouth));
            //.ForMember(m => m.Ear, n => n.Ignore());
            expression.CreateMap<SocialAttribute, PeopleDto>()
                .ForMember(m => m.Age, n => n.MapFrom(s => s.Age))
                .ForMember(m => m.IsMarried, n => n.MapFrom(s => s.IsMarried));
        }
    }

四、运行测试

测试框架使用的xUnit

    public class DtoHelperTest
    {
        [Fact]
        public void GetDto() {
            //moke
            ContainerBuilder builder = new ContainerBuilder();
            builder.LoadAutoMapper();
            builder.RegisterType<AutoMapperProfile>();
            IContainer Container = builder.Build();
            using (var scope = Container.BeginLifetimeScope())
            {
                scope.Resolve<AutoMapperProfile>().Mapping(scope);
                PeopleDto result = new PeopleDto() { Eye = "双眼皮", Mouth = "红润", Age = 18, IsMarried = false };
                PhysicalAttribute physical = new PhysicalAttribute() { Eye = "双眼皮", Mouth = "红润" };
                SocialAttribute social = new SocialAttribute() { Name = "张三", IsMarried = false, Age = 18 };
                PeopleDto output = new DtoHelper(scope.Resolve<IMapper>()).GetDto(physical, social);
                //Assert.Same(result, output);
                Assert.Equal(JsonConvert.SerializeObject(result), JsonConvert.SerializeObject(output));
            }

        }
    }

通过测试！

参考项目：https://github.com/FB208/CodeSpace/tree/master/CodeSpace.CSharp/WebMvc/DemoClass/AutoMapperDemo

NetCore+AutoMapper多个对象映射到一个Dto对象

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