AutoMapper投影-日期/时间

Question

我的实体中有一个DateTime字段，它需要映射到ViewModel中的2个单独的字段以获取日期和时间，即

// Entity
  public partial class Event
    {
        public Int64 Id { get; set; }
        public String Title { get; set; }
        public DateTime StartDateTime { get; set; }
        public DateTime EndDateTime { get; set; }
    }

// ViewModel
public class EventAddEditViewModel
    {
        public Int64 Id { get; set; }
        public String Title { get; set; }
        public String StartDate { get; set; }
        public String EndDate { get; set; }
        public String StartTime { get; set; }
        public String EndTime { get; set; }
    }

看这个例子 ，我有以下映射：

    Mapper.CreateMap<Event, EventAddEditViewModel>()
            .ForMember(dest => dest.StartDate, opt => opt.MapFrom(src => src.StartDateTime.Date))
            .ForMember(dest => dest.StartTime, opt => opt.MapFrom(src => src.StartDateTime.TimeOfDay))
            .ForMember(dest => dest.EndDate, opt => opt.MapFrom(src => src.EndDateTime.Date))
            .ForMember(dest => dest.EndTime, opt => opt.MapFrom(src => src.EndDateTime.TimeOfDay));

太好了 但是，如何反转映射，即Mapper.CreateMap（），以便它也可以在表单发布时进行映射？

Answer 1

我做过类似的事情，但是我在ViewModel上将StartDateTime作为DateTime属性，并为Hours和Minutes提供了两个int属性，例如

// ViewModel
public class EventAddEditViewModel
{
    public Int64 Id { get; set; }
    public String Title { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }
    public int StartHour { get; set; }
    public int EndHour { get; set; }
    public int StartMinute { get; set; }
    public int EndMinute { get; set; }
}

这意味着我可以进行映射

Mapper.CreateMap<Event, EventAddEditViewModel>()
    .ForMember(dest => dest.StartDate, opt => opt.MapFrom(src => src.StartDateTime.Date))
    .ForMember(dest => dest.StartHour, opt => opt.MapFrom(src => src.StartDateTime.Hour))
    .ForMember(dest => dest.StartMinute, opt => opt.MapFrom(src => src.StartDateTime.Minute))
    .ForMember(dest => dest.EndDate, opt => opt.MapFrom(src => src.StartDateTime.Date))
    .ForMember(dest => dest.EndHour, opt => opt.MapFrom(src => src.EndDateTime.Hour))
    .ForMember(dest => dest.EndMinute, opt => opt.MapFrom(src => src.StartDateTime.Minute));

Mapper.CreateMap<EventAddEditViewModel, Event>()
    .ForMember(dest => dest.StartDateTime, opt => opt.MapFrom(src => new DateTime(src.StartDate.Year, src.StartDate.Month, src.StartDate.Day, src.StartHour, src.StartMinute, 0)))
    .ForMember(dest => dest.EndDateTime, opt => opt.MapFrom(src => new DateTime(src.EndDate.Year, src.EndDate.Month, src.EndDate.Day, src.EndHour, src.EndMinute, 0)));

您应该考虑沿着这些行更改viewmodel属性，因为整数将更易于使用，但是，如果它们必须是字符串，则需要一种从字符串中解析出DateTime对象的方法。 根据字符串的格式，应该遵循以下几条原则

Mapper.CreateMap<EventAddEditViewModel, Event>()
    .ForMember(dest => dest.StartDateTime, opt => opt.MapFrom(src => DateTime.Parse( src.StartDate + " " + src.StartTime)))
    .ForMember(dest => dest.EndDateTime, opt => opt.MapFrom(src => DateTime.Parse(src.EndDate + " " + src.EndTime)));

Answer 2

@StanK，在这种情况下，我具有更简单的映射语法：

Mapper.CreateMap<EventAddEditViewModel, Event>()
    .ForMember(dest => dest.StartDateTime, opt => opt.MapFrom(src => src.StartDate.Add(src.StartTime.TimeOfDay)))
    .ForMember(dest => dest.EndDateTime, opt => opt.MapFrom(src => src.EndDate.Add(src.EndTime.TimeOfDay)));