我是否正确使用Automapper 2.0的Include功能？

Question

我不是,或者它不工作......我有一个Source类,我想要映射到彼此继承的多个视图.

基本类是Detail,子类是Edit或Update,它使用与Detail相同的所有数据,还有一些其他字段来管理自己的列表或其他任何内容.

这是我正在使用的地图:

Mapper.CreateMap<Ticket, Detail>()
                .Include<Ticket, Update>()
                .Include<Ticket, Edit>()
                .ForMember(dest => dest.Priority, opt => opt.MapFrom(src => src.Priority.Code))
                .ForMember(dest => dest.TicketID, opt => opt.MapFrom(src => src.ID))
                .ForMember(dest => dest.Status, opt => opt.MapFrom(src => src.StatusCode))
                .ForMember(dest => dest.Category, opt => opt.MapFrom(src => src.ProblemCategoryCode))
                .ForMember(dest => dest.crmBusCode, opt => opt.MapFrom(src => src.Company.crmBusCode))
                .ForMember(dest => dest.TeamMembers, opt => opt.MapFrom(src => src.Schedules.Where(s => s.CompleteTime == null)));

            Mapper.CreateMap<Ticket, Update>()
                .ForMember(m => m.Schedules, opt => opt.MapFrom(t => t.Schedules.Where(s => s.EmployeeID == Util.CurrentUserID() && s.CompleteTime == null)));

            Mapper.CreateMap<Ticket, Edit>();

然后,如果我在Mapper.Map(ticket)中使用MapFrom的任何属性都没有得到评估,那么如果没有设置映射,它们最终会得到它们已经拥有的值.

那么这里有什么问题？

Answer 1

作为替代解决方案,如果您不想打Mapper.Map两次电话.您可以将公共映射移动Detail到扩展方法中:

public static class MappingExtensions
{
    public static IMappingExpression<Ticket, TDest> MapDetailProperties<TDest>(
         this IMappingExpression<Ticket, TDest> mapBase) where TDest : Detail
    {
        return mapBase
            .ForMember(dest => dest.Priority, 
                opt => opt.MapFrom(src => src.Priority.Code))
             ///....
            .ForMember(dest => dest.TeamMembers, 
               opt => opt.MapFrom(src => src
                   .Schedules.Where(s => s.CompleteTime == null)));
    }
}

然后在注册Ticket -> Update和Ticket -> Edit映射器时使用该扩展方法:

Mapper.CreateMap<Ticket, Update>()
    .MapDetailProperties()
    .ForMember(m => m.Schedules, opt => opt.MapFrom(t => t.Schedules
        .Where(s => s.EmployeeID == Util.CurrentUserID() && 
            s.CompleteTime == null)));

Mapper.CreateMap<Ticket, Edit>()
    .MapDetailProperties();

然后你可以正常使用Map:

Ticket ticket = new Ticket();    
var edit = Mapper.Map<Ticket, Edit>(ticket);
var update = Mapper.Map<Ticket, Update>(ticket); 

Answer 2

我是否正确使用Automapper 2.0的Include功能？

否 - 当您使用时.Include,AutoMapper期望目标类与源类处于类似的层次结构中(这将在此处进一步讨论).换句话说,如果你映射到不同的子类Ticket来Detail,Update并且Edit,Include将是适当的.

在您的情况下,这似乎没有帮助.我建议使用.Map带有现有对象的重载并修改它.这样,您只需要为基本类型定义映射:

Ticket ticket = new Ticket();
Edit edit = new Edit();

Mapper.Map<Ticket, Detail>(ticket, edit); 
// Edit has now been automapped using the base mapping.

Mapper.Map<Ticket, Edit>(ticket, edit); 
// The properties unique to Edit have now been mapped.