c# – 将Automapper与抽象对象集合一起使用

2019年8月5日 243次阅读

请看一下我正在尝试做的这个相当人为的例子.

一,数据库模型：

public class Report
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public ICollection<Worker> Workers { get; set; } 
}

public abstract class Worker
{
    public Guid Id { get; set; }
}

public class Fireman : Worker
{
    public string Station { get; set; }
}

public class Cleaner : Worker
{
    public string FavoriteSolvent { get; set; }
}

现在视图模型：

public class AddReportViewModel
{
    public string Name { get; set; }
    public List<AddFiremanViewModel> Firemen { get; set; }
    public List<AddCleanerViewModel> Cleaners { get; set; }
}

public class AddFiremanViewModel
{
    public string Station { get; set; }
}

public class AddCleanerViewModel
{
    public string FavoriteSolvent { get; set; }
}

最后是Automapper配置文件：

public class ReportProfile : Profile
{
    protected override void Configure()
    {
        CreateMap<AddReportViewModel, Report>();
        CreateMap<AddFiremanViewModel, Fireman>();
        CreateMap<AddCleanerViewModel, Cleaner>();
    }
}

我希望Firemen和Cleaners都填充Workers集合,这是一个ICollection< Worker>.我希望这是有道理的.我怎样才能做到这一点？

最佳答案 您的视图模型不包含任何Id字段,因此我在映射中将其设置为Ignore.然后,我只使用LINQ的Union子句将两个源列表组合成一个集合(在使用Automapper转换每个源列表之后).这是映射：

Mapper.CreateMap<AddReportViewModel, Report>()
    .ForMember(d => d.Id, o => o.Ignore())
    .ForMember(d => d.Workers, o => o.MapFrom(
        s => Mapper.Map<ICollection<AddFiremanViewModel>, ICollection<Fireman>>(s.Firemen)
            .Union<Worker>(Mapper.Map<ICollection<AddCleanerViewModel>, ICollection<Cleaner>>(s.Cleaners))))
    ;
Mapper.CreateMap<AddFiremanViewModel, Fireman>()
    .ForMember(d => d.Id, o => o.Ignore())
    ;
Mapper.CreateMap<AddCleanerViewModel, Cleaner>()
    .ForMember(d => d.Id, o => o.Ignore())
    ;

这是一个使用它的例子：

var vm = new AddReportViewModel
{
    Name = "Sample",
    Cleaners = new List<AddCleanerViewModel>
    {
        new AddCleanerViewModel {FavoriteSolvent = "Alcohol"}
    },
    Firemen = new List<AddFiremanViewModel>
    {
        new AddFiremanViewModel {Station = "51"},
        new AddFiremanViewModel {Station = "49"}
    }
};

var db = Mapper.Map<AddReportViewModel, Report>(vm);
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