Composite key trong EF Code first

Đoạn mã dưới đây thiết lập khóa chính cho Entity Framework code first trong trường hợp khóa chính là khóa kép (composite key)

public class OrderDetails
{
 public OrderDetails()
 { 
 
 }
 [Key]
 [Column(Order=1)]
 public int ProductId{ get; set; }
 
 [Key]
 [Column(Order=2)]
 public int OrderId{ get; set; }
 
 public int Quantity{ get; set; }
...
 
}

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