领域驱动设计案例之实现业务3

这一部分主要介绍如何实现下订单的业务，下订单的业务主要涉及到SalesOrder,OrderItem,CustomerInfo与ProductInfo几个领域对象

  public partial class ProductInfo:ValueObject
    {
        public ProductInfo(Product product)
        {
            this.Id = base.Id;
            this.Name = product.ProductName;
            this.UnitPrice = product.UnitPrice;
        }
    }

 public partial class CustomerInfo:ValueObject
    {
        public CustomerInfo(Customer customer,Address address)
        {
            this.Id = base.Id;
            this.Name = customer.Name;
            this.Mobile = customer.Mobile;
            this.State = address.State;
            this.City = address.City;
            this.Street = address.Street;
        }
    }

public partial class OrderItem:Entity
    {
        public OrderItem(Product product,int amount)
        {
            this.Id = base.Id;
            this.Amount = amount;
            this.LineTotal = product.UnitPrice * Amount;
        }
    }

 public partial class SalesOrder:AggreateRoot
    {
        private IRepository<SalesOrder> irepository;
        public SalesOrder(IRepository<SalesOrder> irepository)
        {
            this.irepository = irepository;
        }
        public void CreateOrder(List<Product> products,Customer customer,List<int> amounts,
            string state,string city,string street)
        {
            SalesOrder salesorder = new SalesOrder();
            salesorder.Id = base.Id;
            salesorder.DateTime = DateTime.Now;
            salesorder.CustomerInfo =
                new CustomerInfo(customer, new Address(state, city, street));
            for(int i=0;i<products.Count;i++)
            {
                var orderitem = new OrderItem(products[i], amounts[i]);
                orderitem.ProductInfo = new ProductInfo(products[i]);
                salesorder.OrderItem.Add(orderitem);
                salesorder.TotalPrice = salesorder.TotalPrice + orderitem.LineTotal;
            }

            irepository.Create(salesorder);
        }       
    }

在下订单时，因为会涉及到多个聚合根的协作，所以在DDD.Domain中引入一个领域服务SalesOrderService来进行协调，比如订单项添加成功后，产品的库存
也要相应减少。

 public class SalesOrderService
    {
        private IRepository<Product> irepositoryproduct;
        private IRepository<Customer> irepositorycustomer;
        private IRepository<SalesOrder> irepositorysalesorder;
        public SalesOrderService(IRepository<Product> irepositoryproduct
            ,IRepository<Customer> irepositorycustomer
            ,IRepository<SalesOrder> irepositorysalesorder)
        {
            this.irepositoryproduct = irepositoryproduct;
            this.irepositorycustomer = irepositorycustomer;
            this.irepositorysalesorder = irepositorysalesorder;
        }
        public void CreateSalesOrder(List<string> productnames,List<int> amounts,
            string customername,string state,string city,string street)
        {
            var listproduct = new List<Product>();
            for(int i=0;i<productnames.Count;i++)
            {
                var product =
                    new Product(irepositoryproduct).GetProducyByName(productnames[i]);
                product.ModifyCount(product, amounts[i], irepositoryproduct);

                listproduct.Add(product);
            }
            var customer = new Customer(irepositorycustomer).GetCustomerByName(customername);
            var salesorder = new SalesOrder(irepositorysalesorder);

            salesorder.CreateOrder(listproduct, customer, amounts, state, city, street);
        }
    }

最后在DDD.Application中建立一个应用层服务，实现事务提交(这里只演示SalesOrder应用服务，产品与客户的应用服务提交情况类似)

  public class SalesOrderAppService
    {
        EFRepositoryContext context = new EFRepositoryContext();

        public void CreateSalesOrder(List<string> productnames,
            List<int> amounts,string customername,string state,string city,string street)
        {
            var salesorderservice = new SalesOrderService
                (new ProductRepository(), new CustomerRepository(), new SalesOrderRepository());
            salesorderservice.CreateSalesOrder(productnames, amounts, customername,
                state, city, street);

            context.Commit();
        }
    }

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