c# - Correct way to use AutoMapper in ASP.Net MVC

Question

I'm trying to start using ViewModels - but I'm having trouble with this POST not validating - the values in the model are shown in the Watch part below the code:

ModelStats.IsValid = false

My ItemViewModel is:

  public class ItemViewModel
  {
    public int ItemId { get; set; }
    [Display(Name = "Item")]
    public string ItemName { get; set; }
    [Display(Name = "Description")]
    public string Description { get; set; }
    [Display(Name = "Price")]
    public double UnitPrice { get; set; }
    [Range(0.00, 100, ErrorMessage = "VAT must be a % between 0 and 100")]
    public decimal VAT { get; set; }
    [Required]
    public string UserName { get; set; }
   }

I'm sure it will be something simple - but I've just been looking at it so long, I can't figure out what I'm doing wrong. Can anyone please advise?

Thanks, Mark

Answer 1

就验证失败而言。

如果您不打算UserName在表单中提供，请[Required]从ItemViewModel

---

为了使用AutoMapper。您需要创建一个地图，例如

 Mapper.CreateMap<Item, ItemViewModel>();

然后地图

var itemModel = Mapper.Map<Item, ItemViewModel>(model);

注意：CreateMap必须只创建一次，您应该在启动时注册它。请阅读如何使用 AutoMapper？.

Answer 2

确保您的ItemViewModel,Item类是否具有相同的字段。如果具有相同数据类型的相同字段 AutoMapper 工作正常。

Mapper.CreateMap< Item, ItemViewModel>();

Mapper.Map< Item, ItemViewModel>(ItemVM);

如果两个类中的字段不相同，请确保与自定义映射相同。

Mapper.CreateMap<UserDM, UserVM>().ForMember(emp => emp.Fullname,
map => map.MapFrom(p => p.FirstName + " " + p.LastName));

在上面的自定义映射中，Fullname是UserVM与FirstName,映射的LastName字段UserDM（这里UserDM是域模型，UserVM是视图模型）。