AutoMapper 4.2不忽略配置文件中的属性

Question

在我的Web API控制器方法中,在映射UpdatePlaceDTO到之前PlaceMaster,我进行数据库调用以填充Map未涵盖的属性,但由于某种原因,AutoMapper使这些属性为null.

var mappedPlaceMaster = _mapper.Map<PlaceMaster>(placeMasterDTO);
// mappedPlaceMaster.EntityId is null 

我已经尝试过IgnoreExistingMembers的许多解决方案,但它们都不起作用.

这就是我所拥有的

    public class PlaceMapperProfile : Profile
    {

        protected override void Configure()
        {
            // TO DO: This Mapping doesnt work. Need to ignore other properties
            //CreateMap<UpdatePlaceDto, PlaceMaster>()
            //    .ForMember(d => d.Name, o => o.MapFrom(s => s.Name))
            //    .ForMember(d => d.Description, o => o.MapFrom(s => s.Description))
            //    .ForMember(d => d.ParentPlaceId, o => o.MapFrom(s => s.ParentPlaceId))
            //    .ForMember(d => d.LeftBower, o => o.MapFrom(s => s.LeftBower))
            //    .ForMember(d => d.RightBower, o => o.MapFrom(s => s.RightBower)).IgnoreAllNonExisting();
         }
     }

这是扩展

public static IMappingExpression<TSource, TDestination> IgnoreAllNonExisting<TSource, TDestination>(this IMappingExpression<TSource, TDestination> expression)
        {
            foreach (var property in expression.TypeMap.GetUnmappedPropertyNames())
            {
                expression.ForMember(property, opt => opt.Ignore());
            }
            return expression;
        }

我已经使用模块将mapper注入到我的依赖项中

protected override void Load(ContainerBuilder builder)
        {
            //register all profile classes in the calling assembly
            var profiles =
                from t in typeof(Navigator.ItemManagement.Data.MappingProfiles.PlaceMapperProfile).Assembly.GetTypes()
                where typeof(Profile).IsAssignableFrom(t)
                select (Profile)Activator.CreateInstance(t);

            builder.Register(context => new MapperConfiguration(cfg =>
            {
                foreach (var profile in profiles)
                {
                    cfg.AddProfile(profile);
                }


            })).AsSelf().SingleInstance();

            builder.Register(c => c.Resolve<MapperConfiguration>().CreateMapper(c.Resolve))
                .As<IMapper>()
                .SingleInstance();
        }

我在一些线程中看到_mapper.Map实际上创建了一个新对象,所以我们如何将它添加到现有属性值的"附加"？

Answer 1

好吧，我找到了解决方案。它就在我面前，但我没有看到！

我只需使用 Map 函数的重载，该函数不会创建 PlaceMaster 的新实例，而是分配地图中可用的属性。

mappedPlaceMaster = _mapper.Map(placeMasterDTO, placeMasterFromDatabase);