延迟加载不会加载ICollection属性

Question

我在通过延迟加载加载ICollection对象时遇到问题。

public class Product
{
   [Key]
   public int Id { get; set; }
   public string OrderNum { get; set; }
   public DateTime DateOfPurchased { get; set; }
   public int CustomerId { get; set; }
   public virtual ICollection<OrderedItem> OrderedItems { get; set; }

   public virtual Customer Customer { get; set; }
 }

 public class OrderedItem
 {
    [Key]
    public int Id { get; set; }
    public int ProductId { get; set; }
    public int? Quantity { get; set; }
    public int? ItemId { get; set; }
    public decimal? TotalPrice { get; set; }
    public decimal? Profit { get; set; }

    public virtual Item Item { get; set; }
    public virtual Product Product { get; set; }
  }

每当我将数据加载到Product时，除ICollection属性外，可以加载所有属性。我犯了什么错误吗？

Answer 1

嗨，我在我的本地电脑上尝试了这个并且它有效。下面是Model类和dbContext类。我删除了一些属性以使其简单。就模型创建而言，我添加了一行。

EF课程

        public class Product
            {
                [Key]
                public int Id { get; set; }
                public string OrderNum { get; set; }
                public DateTime DateOfPurchased { get; set; }
                public int CustomerId { get; set; }
                public virtual ICollection<OrderedItem> OrderedItems { get; set; }


            }

            public class OrderedItem
            {
                [Key]
                public int Id { get; set; }
                public int ProductId { get; set; }
                public int? Quantity { get; set; }
                public int? ItemId { get; set; }
                public decimal? TotalPrice { get; set; }
                public decimal? Profit { get; set; }

                public virtual Product Product { get; set; }
            }

我的DBCOntext课程：

     public class SampleDbContext : DbContext
    {
        public SampleDbContext()
            : base("name=SampleDBConnection")
        {
            this.Configuration.LazyLoadingEnabled = true;
            this.Configuration.ProxyCreationEnabled = true;
        }



        public DbSet<Product> Products { get; set; }

        public DbSet<OrderedItem> OrderedItems { get; set; }



        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {

            modelBuilder.Entity<Product>().HasMany(c => c.OrderedItems);



        }
    }

输出：