早期加载dotnet实体框架

Question

I have 3 model classes as follows -

    class Product
    {
      ...
    }

    class OrderDetails
    {
      ...
      public int ProductId { get; set; }
      [ForeignKey("ProductId")]
      public virtual Product Product { get; set; }

      public int OrderId { get; set; }
      [ForeignKey("OrderId")]
      public virtual Order Order { get; set; }
    }

    class Order
    {
      ...
      public virtual ICollection<OrderDetails> OrderDetailsList { get; set; }
    }

When I fetch the details from the context like as follows -

Order order = await _dbContext.Orders.Include(x => x.OrderDetailsList).FirstOrDefault(x => x.Id == orderId);

I would like to do the early loading of the Product for each data in OrderDetailsList as well when I fetch the Order , but I'm unable to achieve this.

Answer 1

Does this work?

Order order = await _dbContext.Orders
          .Include(x => x.OrderDetailsList.Select(od=>od.Product))
          .FirstOrDefault(x => x.Id == orderId);

Answer 2

这对我来说很好用，请尝试一下。

 _dbContext.Orders.Include(s => s.OrderDetailsList.Select(e => e.Product));