DDD实战进阶第一波：开发一般业务的大健康行业直销系统

前一篇文章主要讲了订单上下文的POCO模型，其中订单与订单项中有大量的值对象。这篇文章主要讲讲这些值对象以及订单项、订单相关的领域逻辑。

1.ProductSKUs值对象领域逻辑：

ProductSKUs值对象用于订单项实体中，它的信息应该来源于产品上下文的ProductSKU实体。

public partial class ProductSKUs

{    public ProductSKUs() { }    public ProductSKUs CreateProductSKUs(ProductSKU productsku)    {        this.ProductSPUName = productsku.ProductSPUName;        this.ProductPrice = productsku.DealerPrice;        this.ProductPV = productsku.PV;        this.ProductSKUId = productsku.Id;        return this;    }}

2.OrderItemTotalPV值对象领域逻辑：

OrderItemTotalPV值对象的领域逻辑主要是通过订单项购买的ProductSKU的PV与数量计算出这个订单项的总PV值。

public partial class OrderItemTotalPV

{    public OrderItemTotalPV() { }    public OrderItemTotalPV CreateOrderItemTotalPV(ProductSKU productsku,int count)    {        this.SubTotalPV = productsku.PV * count;        return this;    }}

3.OrderItemTotalPrice值对象领域逻辑：

OrderItemTotalPrice值对象的领域逻辑主要是通过订单项购买的ProductSKU的单价与数量计算出这个订单项的总价。

public partial class OrderItemTotalPrice

{    public OrderItemTotalPrice() { }    public OrderItemTotalPrice CreateOrderItemTotalPrice(ProductSKU productsku,int count)    {        this.SubTotalPrice = productsku.DealerPrice * count;        return this;    }}

4.OrderItem实体的领域逻辑：

OrderItem实体的领域逻辑主要包含两个方面，一个是OrderItem的Code生成规则，二是调用自身包含的上述三个值对象领域逻辑，生成相关的值对象。

public partial class OrderItem

{    public OrderItem() { }    public OrderItem CreateOrderItem(ProductSKU productsku,int count)    {        this.Id = Guid.NewGuid();        this.Code = "OrderItem " + DateTime.Now.ToString();        this.Count = count;        this.OrderItemTotalPrice = new OrderItemTotalPrice().CreateOrderItemTotalPrice(productsku,            count);        this.OrderItemTotalPV = new OrderItemTotalPV().CreateOrderItemTotalPV(productsku,            count);        this.ProductSKUs = new ProductSKUs().CreateProductSKUs(productsku);        return this;    }}

5.OrderStreet值对象领域逻辑：

OrderStreet值对象的信息主要由产品购买时，确定的联系人信息将相关的属性赋值给OrderStreet值对象。

public partial class OrderStreet

{    public OrderStreet() { }    public OrderStreet CreateOrderStreet(Contact contact)    {        this.Privince = contact.Province;        this.City = contact.City;        this.Zero = contact.Zero;        this.Street = contact.Street;        return this;    }}

6.OrderTotalPV值对象领域逻辑：

OrderTotalPV值对象的值由每个订单项的OrderItemTotalPV值对象累加起来。

public partial class OrderTotalPV

{    public OrderTotalPV() { }    public OrderTotalPV CreateOrderTotalPV(List
    
      itemtotalpvs)    {        var ordertotalpv = 0.00M;        itemtotalpvs.ForEach(p =>        {            ordertotalpv += p.SubTotalPV;        });        this.TotalPV = ordertotalpv;        return this;    }}
    

7.OrderTotalPrice值对象领域逻辑：

OrderTotalPrice值对象的值由每个订单项的OrderItemTotalPrice值对象累加起来。

public partial class OrderTotalPrice

{    public OrderTotalPrice() { }    public OrderTotalPrice CreateOrderTotalPrice(List
    
      itemtotalprices)    {        var ordertotalprice = 0.00M;        itemtotalprices.ForEach(p =>        {            ordertotalprice += p.SubTotalPrice;        });        this.TotalPrice = ordertotalprice;        return this;    }}
    

8.Orders聚合根领域逻辑：

Orders聚合根其实就是协调OrderItem实体、自身包含的3个值对象完成整个下单的领域逻辑。

public Orders CreateOrders(Guid id,Guid dealerid,List<ProductSKU> productskus,

List
    
      counts,Contact contact)    {        this.Id = id;        this.OrderDealerId = dealerid;        this.OrderDateTime = DateTime.Now;        this.Telephone = contact.ContactTel;        this.Code = "Order " + DateTime.Now.ToString();        this.OrderStreet = new OrderStreet().CreateOrderStreet(contact);        this.OrderItems = new List
     
      ();        var orderitemtotalprices = new List
      
       ();        var orderitemtotalpvs = new List
       
        ();        for(int i = 0; i < productskus.Count; i++)        {            var orderitem = new OrderItem().CreateOrderItem(productskus[i], counts[i]);            this.OrderItems.Add(orderitem);            orderitemtotalprices.Add(orderitem.OrderItemTotalPrice);            orderitemtotalpvs.Add(orderitem.OrderItemTotalPV);        }        this.OrderTotalPrice = new OrderTotalPrice().CreateOrderTotalPrice(orderitemtotalprices);        this.OrderTotalPV = new OrderTotalPV().CreateOrderTotalPV(orderitemtotalpvs);        return this;    }
       
      
     
    

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