自动应用程序缺少地图配置

Question

我有一个与会者课程和一个与会人员

当我从AtcheeViewModel映射时，与会者模型上的DateTime字段将设置为默认的.NET DateTime，而不是已经存在的AthaTeeViewModel

中存在的值。

这是我的访问者viewmodel

public class AttendeeViewModel
{
    public int Id { get; set; }
    [Required]
    [EmailAddress]
    public string Email { get; set; }
    [Required]
    [Display(Name = "First Name")]
    public string FirstName { get; set; }
    [Required]
    [Display(Name = "Last Name")]
    public string LastName { get; set; }
    public int FEventId { get; set; }
    public string DisplayName
    {
        get { return string.Format("{0}, {1}", FirstName, LastName); }
    }
}

这是我的基本院子

public class Attendee
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public  int Id { get; set; }
    [Required]
    public  string Email { get; set; }
    [Required]
    public  string FirstName { get; set; }
    [Required]
    public  string LastName { get; set; }
    public DateTime CreatedAt { get; set; }
    public bool IsActive { get; set; }

    public int FEventId { get; set; }
    public virtual ApplicationUser CreatedBy { get; set; }
    public virtual FEvent FEvent { get; set; }
    public ICollection<ProjectPledge> ProjectPledges { get; set; } 
}

这是我的映射配置

public static void Configure()
    {
       Mapper.CreateMap<AttendeeViewModel, Attendee>().ForMember(dest=>dest.CreatedAt , opt=>opt.Ignore());
    } 

和Heres的控制器动作

[HttpPost]
    [ValidateAntiForgeryToken]
    public virtual ActionResult Edit(AttendeeViewModel attendee)
    {
        if (!_attendeeService.CanAddAttendee(attendee.Email, attendee.FilanthropyEventId))
        {
            AddEmailModelError();
        }
        if (ModelState.IsValid)
        {
            var mappedAttendee = _attendeeService.GetById(attendee.Id);
            mappedAttendee = Mapper.Map<AttendeeViewModel, Attendee>(attendee);
            _attendeeService.AddOrUpdate(mappedAttendee);
            return RedirectToAction(MVC.Attendee.Index(mappedAttendee.FilanthropyEventId));
        }
        return View(attendee);
    }

如果我将配置设置为opt.Ignore()的插图

Mapper.CreateMap<AttendeeViewModel, Attendee>().ForMember(dest=>dest.CreatedAt , opt=>opt.UseDestinationValue());

映射失败了此例外

Missing type map configuration or unsupported mapping.
Mapping types:
AttendeeViewModel -> DateTime
MyProject.Web.ViewModels.AttendeeViewModel -> System.DateTime
Destination path:
Attendee.CreatedAt.CreatedAt
Source value:
MyProject.Web.ViewModels.AttendeeViewModel

关于我如何解决这个问题的任何想法？

Answer 1

如果要映射到现有对象上，则需要使用以下目的地的过载：

Mapper.Map<Source, Destination>(source, destination);

应该解决这个问题。

Answer 2

您是否尝试过删除" .formember"部分，然后让AutoMapper忽略它？为了更多地帮助您，看到这两种模型进行比较将很有帮助。

更新：在查看您的模型之后，我建议以下问题解决您的问题...

Mapper.CreateMap <attendeeviewmodel, attendee>.ForMember (x => x.CreatedAt, opt => opt.MapFrom (src => datetime.utcnow));