將Automapper與抽象對象集合一起使用

Question

請看一下我正在嘗試做的這個相當人為的例子。

一，數據庫模型：

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; }
}

現在視圖模型：

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，這是一個ICollection<Worker> 。 我希望這是有道理的。 我怎樣才能做到這一點？

Answer 1

您的視圖模型不包含任何Id字段，因此我在映射中將其設置為Ignore 。 然后，我只使用LINQ的Union子句將兩個源列表組合成一個集合（在使用Automapper轉換每個源列表之后）。 這是映射：

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())
    ;

這是一個使用它的例子：

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);