我是否正确使用Automapper 2.0的“包​​含"功能? [英] Am I using Automapper 2.0's Include functionality correctly?

问题描述

要么我不行，要么不行...我有一个Source类，我想映射到彼此继承的多个视图.

Either I'm not, or it isn't working... I have a single Source class that I want to map to multiple views that inherit from each other.

基本上，基类是Detail，子类是Edit或Update，它们使用与Detail相同的所有数据，另外还有两个字段来管理自己的列表或其他内容.

Basically the base class is the Detail, and the child class is Edit or Update which use all the same data as Detail, plus a couple other fields to manage their own lists or whatever.

这是我正在使用的地图:

Here are the maps I'm using:

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，如果我对Mapper.Map(ticket)的任何使用MapFrom的属性都没有求值，那么它们最终将得到在没有设置映射的情况下所拥有的值.

Then if I Mapper.Map(ticket) any of the properties that use MapFrom don't get evaluated, they just end up with the values they'd have had if there was no set mapping.

那这里怎么了?

推荐答案

如果不想两次调用Mapper.Map，则可以作为替代解决方案.您可以将Detail的常见映射移到扩展方法中:

As an alternative solution if you don't want to call Mapper.Map two times. You can move the common mappings of Detail into an extension method:

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:

And then use that extension method when registering the Ticket -> Update and Ticket -> Edit mappers:

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();

然后您可以正常使用地图:

Then you can use Map normally:

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

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