当我的类中有属性具有默认构造函数来提供值自动映射器时，如何映射？

Question

我想创建一个从 UserDto 到 User 实体的映射，请帮助我如何实现这一点。我在用户实体中有 GeoLocation 属性，如何映射这些属性。有人可以举个例子吗？

我正在使用 AutoMapper 包：https://www.nuget.org/packages/AutoMapper/

我的用户实体类：

public class User
    {
        public string Id { get; set; }

        public string Name { get; set; }

        public GeoLocation PurchaseLocationCoordinates { get; set; }
    }

我的 Dto 课程：

public class UserDto
    {
        public string Id { get; set; } = Guid.NewGuid().ToString();

        public string Name { get; set; }

        public string PurchaseLocationLatitude { get; set; }

        public string PurchaseLocationLongitude { get; set; }
    }

地理位置类：

public class GeoLocation
    {
        public GeoLocation(double lon, double lat)
        {
            Type = "Point";
            if (lat > 90 || lat < -90) { throw new ArgumentException("A latitude coordinate must be a value between -90.0 and +90.0 degrees."); }
            if (lon > 180 || lon < -180) { throw new ArgumentException("A longitude coordinate must be a value between -180.0 and +180.0 degrees."); }
            Coordinates = new double[2] { lon, lat };
        }

        [JsonProperty("type")]
        public string Type { get; set; }
        [JsonProperty("coordinates")]
        public double[] Coordinates { get; set; }

        public double? Lat() => Coordinates?[1];
        public double? Lon() => Coordinates?[0];
    }

映射：

CreateMap<UserDto, User>();

Answer 1

你可以参考这段代码：

 var config = new MapperConfiguration(cfg =>
            {
                cfg.CreateMap<UserDto, User>()
    .ForMember(x => x.PurchaseLocationCoordinates, opt => opt.MapFrom(model => model));
                cfg.CreateMap<UserDto, GeoLocation>()
                 .ForCtorParam("lon", opt => opt.MapFrom(src => src.PurchaseLocationLongitude))
                  .ForCtorParam("lat", opt => opt.MapFrom(src => src.PurchaseLocationLatitude));
            });
            UserDto userdto = new UserDto()
            {
                PurchaseLocationLongitude = "80.44",
                PurchaseLocationLatitude = "34.56"
            };
            IMapper iMapper = config.CreateMapper();
            var user = iMapper.Map<UserDto, User>(userdto);