程式隨筆
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AutoMapper運用 (二)

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如果是複雜Class要Mapper時 

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public class Category 
{
  public int id { get; set; }
  public List<product>  products {get;set;}
}

public class Product 
{
  public int id { get; set; }
  public string name { get; set; }
  public int qantity {get;set;}
}

Category要Mapping到CategoryViewModel

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public class CategoryViewModel 
{
 public int id { get; set; }
 public List<Book>  books {get;set;}
}

public class Book 
{
 public string title {get;set;}

 public int number{get;set;}
}

有兩種做法,結果都會是一樣的

  1. ```csharp
    Category category = new Category()
    {
    id = 1,
    products = new List()
    {
    new Product()
    {
    id = 1,
    name = “西遊戲”,
    qantity =10,
    },
    new Product()
    {
    id = 2,
    name = “三國志”,
    qantity =30,
    },
    new Product()
    {
    id = 3,
    name = “鹿鼎記”,
    qantity =50,
    }
    }
    };

    Mapper.CreateMap<Category, CategoryViewModel>()
    .ForMember(d => d.id, o => o.MapFrom(s => s.id))
    .ForMember(d => d.books, o => o.MapFrom(s => s.products));

    Mapper.CreateMap<Product, Book>()
    .ForMember(d => d.title, o => o.MapFrom(s => s.name))
    .ForMember(d => d.number, o => o.MapFrom(s => s.qantity));

var viewModel = Mapper.Map(category);
viewModel.Dump();

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2.  ```csharp
void Main()
{
   Category category = new Category()
   {
     id = 1,
     products = new List<Product>()
     {
       new Product()
       {
         id = 1,
         name = "西遊戲",
         qantity =10,
       },
       new Product()
       {
         id = 2,
         name = "三國志",
         qantity =30,
       },
       new Product()
       {
         id = 3,
         name = "鹿鼎記",
         qantity =50,
       }
    }
 };

     Mapper.CreateMap<Category, CategoryViewModel>()
  .ForMember(d => d.id, o => o.MapFrom(s => s.id))
  .ForMember(d => d.books, o => o.ResolveUsing<BookResolve>().FromMember(s => s.products));

     var viewModel = Mapper.Map<CategoryViewModel>(category);
 viewModel.Dump();
}

    public class BookResolve : ValueResolver<IList<Product>, IList<Book>>{
 protected override IList<Book> ResolveCore(IList<Product> source) {
    List<Book> books = new List<Book>();
    foreach (var item in source)
    {
      var book = new Book()      {
        number = item.qantity,
        title = item.name
      };
      books.Add(book);
    }
    return books;
 }
}