Dto数据传输对象

public class GoodsEntity//这是我们的实体类
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public decimal Price { get; set; }
        public DateTime? CreateTime { get; set; }
        public bool IsDeleted { get; set; }
        public List<Items> Items { get; set; }
        public BrandsEntity Brands { get; set; }
    }

   public class GoodsDto
    {
        public string GoodsName { get; set; }
        public decimal Price { get; set; }
        public string CreateTime { get; set; }
        public string Content { get; set; }
        public bool IsDeleted { get; set; }
        public List<Items> Items { get; set; }
        public string BrandName { get; set; }
    }

 services.AddAutoMapper(typeof(Startup));

   public class AutoMapperConfigs
    {
        public static MapperConfiguration RegisterMappings()
        {
            return new MapperConfiguration(cfg =>
            {
                cfg.AddProfile(new GoodsProfile());
            });
        }
    }

 public class GoodsProfile : Profile
    {
        // 添加你的实体映射关系.
        public GoodsProfile()
        {
            // GoodsEntity转GoodsDto. 
            CreateMap<GoodsEntity, GoodsDto>()
                // 映射发生之前
                // 映射之前统一处理
                .BeforeMap((src, dest) => src.Price = src.Price + 10)
                // 默认赋值
                .BeforeMap((src, dest) => src.CreateTime = src.CreateTime == null ? (new DateTime(2012, 12, 12)) : src.CreateTime)
                // 映射匹配
                .ForMember(dest => dest.GoodsName, opt => opt.MapFrom(src => src.Name))
                .ForMember(dest => dest.CreateTime,
                    opt => opt.MapFrom(src => ((DateTime)src.CreateTime).ToString("yyyy-MM-dd")))
                // 匹配的过程中赋值
                .ForMember(dest => dest.Price, opt => opt.MapFrom(src => src.Price + 10))
                // 忽略某个属性的映射
                .ForMember(dest => dest.IsDeleted, opt => opt.Ignore())
                // 合并
                .ForMember(dest => dest.GoodsName, opt => opt.MapFrom(src => src.Brands.Name +" "+ src.Name))
                // 映射发生之后
                .AfterMap((src, dest) => dest.GoodsName = dest.Price < 40 ? "N/A." : dest.GoodsName)
                .AfterMap((src, dest) => dest.Content = "数据传输对象（DTO)(DataTransfer Object)");
            // 最简单的匹配，属性字段/类型等完全一致
            // GoodsDto转GoodsEntity.
            CreateMap<GoodsDto, GoodsEntity>();
        }
    } 

public class Configuration
{
    public static void Configure()
    {
        Mapper.Initialize(cfg =>
        {
            cfg.AddProfile<Profiles.SourceProfile>();
            cfg.AddProfile<Profiles.OrderProfile>();
            cfg.AddProfile<Profiles.CalendarEventProfile>();
        });
    }
}