public List <Order> QueryOrder(OrderQueryArgs args)
{
IEnumerable <Order> result;
switch (args.sortKey)
{
case SortKey.IDAscending:
result = from order in orders where args.Check(order) orderby order.ID ascending select order;
break;
case SortKey.PriceAscending:
result = from order in orders where args.Check(order) orderby order.TotalPrice ascending select order;
break;
case SortKey.CustomerNameAscending:
result = from order in orders where args.Check(order) orderby order.CustomerName ascending select order;
break;
case SortKey.IDDescending:
result = from order in orders where args.Check(order) orderby order.ID descending select order;
break;
case SortKey.PriceDescending:
result = from order in orders where args.Check(order) orderby order.TotalPrice descending select order;
break;
case SortKey.CustomerNameDescending:
result = from order in orders where args.Check(order) orderby order.CustomerName descending select order;
break;
default:
result = null;
break;
}
List <Order> resultList = new List <Order>();
foreach (Order i in result)
{
resultList.Add(new Order(i));
}
return(resultList);
}
public static Order SelectOrder(OrderService os)
{
Console.WriteLine("请输入订单ID，-1放弃查询，留空则使用条件查询");
int?id;
do
{
id = ReadInt(-1, 2147483647, true);
if (id.HasValue)
{
if (id == -1)
{
return(null);
}
Order order = os.GetOrderByID(id.Value);
if (order == null)
{
Console.WriteLine("该订单不存在，请重新输入ID：");
continue;
}
else
{
return(order);
}
}
} while (id.HasValue);
OrderQueryArgs args = new OrderQueryArgs();
Console.WriteLine("请输入订单客户名，留空则不使用此条件");
args.customerName = Console.ReadLine();
Console.WriteLine("请输入包含的商品名，留空结束输入");
string itemName;
do
{
itemName = Console.ReadLine();
if (itemName != "")
{
args.itemNames.Add(itemName);
}
}while (itemName != "");
Console.WriteLine("请输入最小金额，留空则不使用此条件");
args.minPrice = ReadDecimal(true) ?? -1;
Console.WriteLine("请输入最大金额，留空则不使用此条件");
args.maxPrice = ReadDecimal(true) ?? -1;
args.sortKey = SelectSortKey();
List <Order> orders = os.QueryOrder(args);
if (orders.Count == 0)
{
Console.WriteLine("没有符合条件的订单");
Console.WriteLine("按任意键继续...");
Console.ReadKey(true);
return(null);
}
for (int i = 0; i < orders.Count; i++)
{
Console.WriteLine($"{i + 1}. {orders[i].ToString()}");
}
Console.WriteLine("请输入所选择订单的编号");
int index = ReadInt(1, orders.Count);
return(orders[index - 1]);
}