具有子列表屬性映射問題的自動映射器

Question

我有以下模特

楷模

public class Dish
{
    [Required]
    public Int64 ID { get; set; }
    [Required]
    public string Name { get; set; }
    [Required]
    public string Description { get; set; }
    [Required]
    public double Price { get; set; }
    [Required]
    public DateTime From { get; set; }
    [Required]
    public DateTime To { get; set; }
    [Required]
    public bool IsAvailable { get; set; }
    [Required]
    public string MealImage { get; set; }
    [Required]
    public List<Ingredients> Ingredients { get; set; }
}


public class Ingredients
{
    [Required]
    public Int64 ID { get; set; }
    [Required]
    public string Name { get; set; }
    [Required]
    public int Quantity { get; set; }
    [Required]
    public Int64 Dish_ID { get; set; }
    [ForeignKey("Dish_ID")]
    public virtual Dish Dish { get; set; }
}

以下是他們的ViewModel

 public class DishViewModel
{
    public Int64 ID { get; set; }
    [Required]
    public string Name { get; set; }
    [Required]
    public string Description { get; set; }
    [Required]
    public double Price { get; set; }
    [Required]
    public DateTime From { get; set; }
    [Required]
    public DateTime To { get; set; }
    public bool IsAvailable { get; set; }
    public string MealImage { get; set; }
    [Required]
    public string IngredientsData { get; set; }

    public List<IngredientsViewModel> Ingredients { get; set; }
}

 public class IngredientsViewModel
{
    [Required]
    public string Name { get; set; }
    [Required]
    public int Quantity { get; set; }
    [Required]
    public Int64 Dish_ID { get; set; }
}

我正在使用Automapper在它們之間進行映射。 以下是我用於將菜單映射到DishViewModel的代碼

public DishViewModel Create(Dish dish)
    {
        Mapper.Initialize(cfg => cfg.CreateMap<Dish, DishViewModel>()
        .ForMember(s => s.Ingredients, c => c.MapFrom(m => m.Ingredients))
        );
        DishViewModel dishViewModel = Mapper.Map<DishViewModel>(dish);
        return dishViewModel;
    }

我在上面的過程中遇到了以下錯誤

任何人都可以指導我在上面的過程中做了什么錯。

謝謝

Answer 1

您必須為Ingredients創建Mapping配置，類似於Dish for Dish和DishViewModel

正如您在異常中所看到的那樣，缺少地圖配置。

將配置添加到Mapper.Initialize

Mapper.Initialize(

    // Here you are only adding one config.

cfg => cfg.CreateMap<Dish, DishViewModel>()
        .ForMember(s => s.Ingredients, c => c.MapFrom(m => m.Ingredients))

        );

改為：

Mapper.Initialize(cfg =>
    {
          cfg.CreateMap<Dish, DishViewModel>()
                .ForMember(s => s.Ingredients, c => c.MapFrom(m => m.Ingredients));

           cfg.CreateMap<Ingredients, IngredientsViewModel>();

     });

您也不需要以下內容：

.ForMember(s => s.Ingredients, c => c.MapFrom(m => m.Ingredients));

由於屬性的名稱相同，AutoMapper將自動映射屬性。

所以你可以使用這個：

Mapper.Initialize(cfg =>
    {
          cfg.CreateMap<Dish, DishViewModel>();

          cfg.CreateMap<Ingredients, IngredientsViewModel>();

     });