域驱动设计 – 通过聚合根访问实体：简单的例子？

您能否通过ita聚合根显示通过聚合访问实体内容的简单示例？我不清楚你将如何表示聚合权限以反映这些概念. TIA.

解决方法

您通常会将此封装在Aggregate对其合同公开的命令中.

例如,使用Order Aggregate,您可以使用从GUI获取的数据添加OrderLines.

// This is the Order Aggregate Root
public class Order
{
    private readonly int id;
    private readonly Customer customer; // Customer is another Aggregate
    private readonly IList<OrderLine> orderLines;
    private readonly IOrderLineFactory orderLineFactory;

    public Order(int id,Customer customer,IOrderLineFactory orderLineFactory)
    {
        this.id = id;
        this.customer = customer;
        this.orderLines = new List<OrderLine>();
        this.orderLineFactory = orderLineFactory;
    }

    public void AddOrderLine(Item item,int quantity)
    {
        OrderLine orderLine = orderLineFactory.Create(this,item,quantity);
        orderLines.Add(orderLine);
    }
}