Question

我正在尝试使用自动映射器来实现以下代码。

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);
}

我得到的所有值都要与注册号码分开，注册号码可以包含带注册号码的车辆列表。我正在尝试循环并获取vla.vehicles.RegistrationNumber的值，连接并将结果保存到我的视图模型字段。我的Automapper代码位于

之下

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))));
});

非常感谢任何帮助。

Answer 1

您已经离我很近，但string.Join应该在Select之外（目前仅在string为IEnumerable<char>时进行编译，因此会点击this overload，结果是一些奇怪的字符串列表与逗号连接字符）：

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

使用Automapper进行复杂对象映射

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