MVC控制器類可以有多個IEnumerable嗎？

Question

我可以做兩個LINQ查詢，然後將每個查詢的結果作爲IEnumerable返回，還是需要將查詢組合起來，以及如何完成這些查詢？

Answer 1

您的控制器可以從一個操作返回多個IEnumerable。

這將如下進行：

視圖模型

public class FooModel 
    { 
     public List<Category> Categories { get; set; } 
     public List<SubCategory> SubCategories { get; set; } 
    } 

    public class Category 
    { 
     public int Id { get; set; } 
     public string Description { get; set; } 
    } 

    public class SubCategory 
    { 
     public int Id { get; set; } 
     public string Description { get; set; } 
     public int CategoryId { get; set; } 
    } 

控制器動作

public ActionResult Index() 
    { 
     var model = new FooModel(); 
     var categories = new List<Category>(); 
     var subCategories = new List<SubCategory>(); 

     categories.Add(new Category { Id = 1, Description = "Cat 1" }); 
     categories.Add(new Category { Id = 2, Description = "Cat 2" }); 
     subCategories.Add(new SubCategory { Id = 1, Description = "Sub-Cat 1", CategoryId = 1 }); 
     subCategories.Add(new SubCategory { Id = 2, Description = "Sub-Cat 2", CategoryId = 2 }); 

     model.Categories = categories; 
     model.SubCategories = subCategories.Where(s => s.Id == 1).ToList(); 


     return View(model); 
    } 

在上述FooModel（視圖模型）包含返回的兩個列表從控制器Index的操作。