CQRS＆amp; PurchaseOrder AggregateRoot

Question

我是CQRS＆amp; DDD和我正在使用MS WideWorldImporters数据库的练习，目前我坚持购买订单放置命令，说实话我不知道它应该是什么样子，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填充其OrderLines而不是保存。如果是，那么当域模型看起来如何时Command应该是这样的：

示例域模型：

    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
    }

}

示例命令处理程序：

$hostName = "https://server.visualstudio.com/WebAndMobile/:8080"
$user = "user"
$password =  ConvertTo-SecureString "password" -AsPlainText -Force
$credential =  New-Object System.Management.Automation.PSCredential ($user,$password)
$server=Get-TfsServer -Name $hostName -credential $credential -all

Answer 1

你能不能做这样的事情吗？

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);
}