在我的Web应用程序中，在主视图中，我想显示单独的模型数据。
首先，我创建了一个像这样的视图模型：

public class ProductsViewModel 
{
    public IEnumerable < CakesViewModel > CakesVM { get; set; }
    public IEnumerable < PizzaViewModel > PizzaVM { get; set; }
    public IEnumerable < FastFoodsViewModel > FastFoodsVM { get; set; }
}

public class CakesViewModel 
{
    [Key]
    public int ID {get;set;}
  
    [Required]
    [Display(Name = "Product Name")]
    public string ProductName { get; set; }
   
    [Required]
    public decimal ProductPrice { get; set; }
 
    [Required]
    public string ProductPicture { get; set; }

    [Required]
    [Display(Name = "Category Name")]
    public int Category_ID { get; set; }

    public string Category_Name { get; set; }
 
    [Required]
    public bool Is_Customizable { get; set; }

    public virtual ICollection < CustomizableFoods > CustomizableFoods { get; set; }
}

public class PizzaViewModel 
{
    [Key]
    public int ID { get; set; }

    [Required]
    [Display(Name = "Product Name")]
    public string ProductName { get; set; }

    [Required]
    public decimal ProductPrice { get; set; }

    [Required]
    public string ProductPicture { get; set; }

    [Required]
    [Display(Name = "Category Name")]
    public int Category_ID { get; set; }

    public string Category_Name { get; set; }

    [Required]
    public bool Is_Customizable { get; set; }

    public virtual ICollection < CustomizableFoods > CustomizableFoods { get; set; }
}

public class FastFoodsViewModel
{
    [Key]
    public int ID { get; set; }

    [Required]
    [Display(Name = "Product Name")]
    public string ProductName { get; set; }

    [Required]
    public decimal ProductPrice { get; set; }
 
    [Required]
    public string ProductPicture { get; set; }
 
    [Required]
    [Display(Name = "Category Name")]
    public int Category_ID { get; set; }

    public string Category_Name { get; set; }

    [Required]
    public bool Is_Customizable { get; set; }

    public virtual ICollection < CustomizableFoods > CustomizableFoods { get; set; }
}

在控制器中，我尝试将单独的产品列表加载到单独的列表中，并从该列表加载到视图模型，然后将主视图模型传递给视图。
下面是我的控制器代码：

List<Products> Cakes = db.Products.Where(x => x.Category_ID == 1).ToList<Products>();
List<Products> Pizzas = db.Products.Where(x => x.Category_ID == 2).ToList<Products>();
List<Products> FastFoods = db.Products.Where(x => x.Category_ID == 3).ToList<Products>();

ProductsViewModel allProducts = new ProductsViewModel();

foreach (Products item in Cakes)
{
       CakesViewModel productsView = new CakesViewModel();
       productsView.ID = item.ID;
       productsView.ProductPrice = item.ProductPrice;
       productsView.ProductName = item.ProductName;
       productsView.Is_Customizable = item.Is_Customizable;
       productsView.Category_Name = item.FoodCategories.CategoryName;
       productsView.ProductPicture = item.ProductPicture;
       allProducts.CakesVM(productsView); // here is an error
}

在allProducts.CakesVM(productsView);中，我没有看到CakesVM.Add()选项。我需要知道一个解决方案。