public Order GetOrder(uint id)
{
using (var management = new OrderManagement())
{
return(orders.Where(o => o.OrderId == id).FirstOrDefault());
}
}
public OrderService()
{
using (var management = new OrderManagement())
{
orders = new List <Order>();
}
}
public List <Order> QueryOrdersByCustomerName(string customerName)
{
using (var management = new OrderManagement())
{
return(orders
.Where(order => order.Customer == customerName)
.OrderBy(o => o.TotalPrice)
.ToList());
}
}
public List <Order> QueryOrdersByGoodsName(string goodsName)
{
using (var management = new OrderManagement())
{
var query = orders
.Where(order => order.Items.Exists(item => item.GoodsName == goodsName))
.OrderBy(o => o.TotalPrice);
return(query.ToList());
}
}
public void AddOrder(Order order)
{
if (orders.Contains(order))
{
throw new ApplicationException($"Add Order Error: Order with id {order.OrderId} already exists!");
}
using (var management = new OrderManagement())
{
orders.Add(order);
}
}
public void RemoveOrder(uint orderId)
{
Order order = GetOrder(orderId);
if (order != null)
{
using (var management = new OrderManagement())
{
orders.Remove(order);
}
}
}
public void UpdateOrder(Order newOrder)
{
using (var management = new OrderManagement())
{
Order oldOrder = GetOrder(newOrder.OrderId);
if (oldOrder == null)
{
throw new ApplicationException($"Update Error：the order with id {newOrder.OrderId} does not exist!");
}
orders.Remove(oldOrder);
orders.Add(newOrder);
}
}
