一个用户多个订单

一个实体包含多实体。

定义用户+订单。

  public class Order {
      public int RecordId { get; set; }
      public string RecordName { get; set; }
      public decimal Price { get; set; }
   }
   public class Person
   {
      public int RecordId { get; set; }
      public string Name { get; set; }
      
      //注意此 自动属性 的使用方法
      public IList<Order> OrderList { get; set; }
   }

调用：

class Program
   {
      static void Main(string[] args)
      {
         //订单1
         Order order1 = new Order();
         order1.RecordId = 1;
         order1.RecordName = "语文";
         order1.Price = 45.32M;

         //订单2
         Order order2 = new Order();
         order2.RecordId = 2;
         order2.RecordName = "数学";
         order2.Price = 55.67M;

         //订单集合
         List<Order> orderList = new List<Order>();
         orderList.Add(order1);
         orderList.Add(order2);

         //购买订单者：张三
         Person person = new Person();
         person.Name = "张三";
         person.RecordId = 1;
         person.OrderList = orderList;

         //打印张三订单的信息
         Console.WriteLine("购买者编号：" + person.RecordId + ";购买者：" + person.Name);
         Console.WriteLine("购买的教程：" + person.OrderList[0].RecordName + ";" + person.OrderList[1].RecordName);

         Console.ReadKey();
      }
   }

打印：