的LINQ的GroupBy類

Question

所以，我有以下類：

public class Category 
{ 
    public int idCategory { get; set; }; 
    public string nameCategory { get; set; }; 
    public List<Product> products { get; set; } 
} 

public class Product 
{ 
    public int idProduct { get; set; }; 
    public string nameProduct { get; set; }; 
    public float price { get; set; }; 
} 

我有返回包含在這條路上元素列表的方法：

idCategory, nameCategory, idProduct, nameProduct, price 
0, Shoes, 0, Jordan, 99.9 
0, Shoes, 1, Nike, 59.9 
0, Shoes, 2, Adidas, 85.6 
0, Shoes, 3, NewFeel, 11.0 
1, watch, 6, Armani, 59.9 
1, watch, 8, CK, 85.6 
1, watch, 9, Rolex, 11.0 

現在我想，讓他們作爲類別列表。

我可以通過這個列表來循環創建一個父親列表，但我想要做的就是使用linq「group by」或任何其他方法來實現此目的。

這是可能的嗎？

Answer 1

是這樣的嗎？

flatList 
    .GroupBy(i => i.FatherId) 
    .Select(g => new Father() 
    { 
     id = g.Key, 
     propertyF, 
     children = 
      g 
       .Select(c => new Child() 
       { 
        id = ChildrenId, 
        prop1, 
        prop2 
       }) 
       .ToList() 
    }) 

Answer 2

fathers.SelectMany(f => f.children, 
         (f, c) => new YourConsolidatedClassName 
            { 
             Id = f.Id, 
             propertyF = f.propertyF, 
             ChildId = c.Id, 
             prop1 = c.prop1, 
             prop2 = c.prop2 
            }).ToList(); 

Answer 3

如果你有麻煩讓與您提供的這項工作，這裏是一個另類：

List<string> input = new List<string> 
{ 
    "idCategory,nameCategory,idProduct,nameProduct,price", 
    "0,Shoes,0,Jordan,99.9", 
    "0,Shoes,1,Nike,59.9", 
    "0,Shoes,2,Adidas,85.6", 
    "0,Shoes,3,NewFeel,11.0", 
    "1,watch,6,Armani,59.9", 
    "1,watch,8,CK,85.6", 
    "1,watch,9,Rolex,11.0", 
}; 
List<Category> categories = new List<Category>(); 
foreach(string s in input.Skip(1)) 
{ 
    string[] temp = s.Split(','); 
    if(categories.Contains<Category>(new Category 
    { 
     idCategory = int.Parse(temp[0]) 
    }, new CategoryEquality())) 
     categories.Find(id => id.idCategory == int.Parse(temp[0])).products.Add(new Product 
     { 
      idProduct = int.Parse(temp[2]), 
      nameProduct = temp[3], 
      price = float.Parse(temp[4]) 
     }); 
    else 
     categories.Add(new Category 
     { 
      idCategory = int.Parse(temp[0]), 
      nameCategory = temp[1], 
      products = new List<Product> 
      { new Product 
       { 
        idProduct = int.Parse(temp[2]), 
        nameProduct = temp[3], 
        price = float.Parse(temp[4]) 
       } 
      } 
     }); 
} 
    public class CategoryEquality : IEqualityComparer<Category> 
    { 
     public bool Equals(Category a, Category b) 
     { 
      return a.idCategory == b.idCategory; 
     } 
     public int GetHashCode(Category a) 
     { 
      return a.idCategory.GetHashCode(); 
     } 
    } 
    public class Category 
    { 
     public int idCategory 
     { 
      get; 
      set; 
     } 
     public string nameCategory 
     { 
      get; 
      set; 
     } 
     public List<Product> products 
     { 
      get; 
      set; 
     } 
    } 

    public class Product 
    { 
     public int idProduct 
     { 
      get; 
      set; 
     } 
     public string nameProduct 
     { 
      get; 
      set; 
     } 
     public float price 
     { 
      get; 
      set; 
     } 
    }