CQRS＆PurchaseOrder AggregateRoot

Question

我是CQRS & DDD的新手，对于我正在使用MS WideWorldImporters数据库的练习，此刻我陷于采购订单放置命令，说实话我不知道它应该如何显示你能指导我吗？ 我应该有1个PlaceOrderCommand和处理程序应该使用它来创建PurchaseOrder填充它的OrderLines并保存。如果是，如何命令应该是时域模型的样子：

样品域模型：

public class PurchaseOrder : AggregateRoot<int> 
{ 
    private PurchaseOrder(int id, int supplierID, DateTime orderDate, int deliveryMethodID, int contactPersonID) : base(id) 
    { 
     SupplierID = supplierID; 
     OrderDate = orderDate; 
     DeliveryMethodID = deliveryMethodID; 
     ContactPersonID = contactPersonID; 
    } 

    public List<PurchaseOrderLine> PurchaseOrderLines { get; private set; } 
    public int SupplierID { get; private set; } 
    public DateTime OrderDate { get; private set; } 
    public int DeliveryMethodID { get; private set; } 
    public int ContactPersonID { get; private set; } 

    public static PurchaseOrder CreatePurchaseOrder(int supplierID, int deliveryMethodID, int contactPersonID) 
    { 
     return new PurchaseOrder(1, supplierID, DateTime.Now, deliveryMethodID, contactPersonID); 
    } 

    public void AddPurchaseOrderLine(int stockItemID) 
    { 
     PurchaseOrderLines.Add(new PurchaseOrderLine(this.Id, stockItemID)); 
    } 
} 

样品命令处理程序：

public class PurchaseOrdersCommandHandler : 
    ICommandHandler<PlacePurchaseOrder> 
{ 
    private readonly IPurchaseOrderRepository purchaseOrderRepository; 

    public PurchaseOrdersCommandHandler(IPurchaseOrderRepository purchaseOrderRepository) 
    { 
     this.purchaseOrderRepository = purchaseOrderRepository; 
    } 

    public void Handle(PlacePurchaseOrder command) 
    { 
     // TODO: based on command Create Purchase order with its line items and save it to db as a whole 
    } 

} 

Answer 1

你能不只是做这样的事？

public void Handle(PlacePurchaseOrder command) 
{ 
    var purchaseOrder = PurchaseOrder.CreatePurchaseOrder(command.id, command.upplierID, command.orderDate, command.deliveryMethodID, command.contactPersonID); 
    foreach(int stockItemID in command.OrderLines) 
    { 
     purchaseOrder.AddPurchaseOrderLine(stockItemID) 
    } 
    this.purchaseOrderRepository.Save(purchaseOrder); 
}