C# 使用Automapper的复杂对象映射

我正在尝试使用自动映射器来实现下面的代码

List<VlaListView> vlaVmList = new List<VlaListView>();
var vlaCollectionList = vlaCollection.ToList(); //database populate list

foreach (var vla in vlaCollectionList)
{
    VlaListView vlaVm = new VlaListView();
    vlaVm.VlaId = vla.VlaId;
    vlaVm.UserName = vla.UserName;
    vlaVm.DateOut = vla.DateOut.ToShortDateString();
    vlaVm.ReturnDate = vla.ReturnDate.ToShortDateString();
    vlaVm.Status = vla.Status;

    string regnumbers = string.Empty;

    foreach (var vehicle in vla.Vehicles)
    {
        regnumbers += vehicle.RegistrationNumber + ", ";
    }

    regnumbers = regnumbers.Remove(regnumbers.Length - 2);
    vlaVm.RegistrationNumbers = regnumbers;

    vlaVmList.Add(vlaVm);
}

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非常感谢您提供的任何帮助。

很接近，但是

string.Join

应该在

Select

之外（目前它编译的唯一原因是

string

是

IEnumerable

，因此命中，结果是一些奇怪的字符串列表，带有逗号连接字符）：

---

HGNNOTATION的使用以及

vla

和

val

的混合使得这一点非常难以理解。很抱歉，我编辑了ValCollectionList上的打字错误非常感谢Ivan，感谢您的明确解释，我将此标记为答案

AutoMapper.Mapper.Initialize(config =>
{
    config.CreateMap<Vla, VlaListView>()
        .ForMember(x => x.DateOut, opt => opt.MapFrom(src => src.DateOut.ToShortDateString()))
        .ForMember(x => x.ReturnDate, opt => opt.MapFrom(src => src.ReturnDate.ToShortDateString()))

        // this is the ForMember I can't work out, I can't get the values of the registration numbers
        .ForMember(x => x.RegistrationNumbers, opt => opt.MapFrom(src => src.Vehicles.Select(v => string.Join(", ", v.RegistrationNumber))));
});

.ForMember(dest => dest.RegistrationNumbers, opt => opt.MapFrom(src =>
    string.Join(", ", src.Vehicles.Select(v => v.RegistrationNumber))));