我想通过查询SaleConfirmation表来获取已确认/定稿购买的摘要,但是方法语法查询让我感到很困难。
数据库表
以下是存储已完成销售的SaleConfirmation表结构。
Id OfferId ProdId Qty SaleDate
-------------------------------------------------------
10 7 121518 150 2013-03-14 00:00:00.000
19 7 100518 35 2013-03-18 14:46:34.287
20 7 121518 805 2013-03-19 13:03:34.023
21 10 131541 10 2013-03-20 08:34:40.287
- Id: 唯一行标识。
- OfferId: 外键,链接到 Offer/Sale 表。
- ProdId: 产品在产品表中的ID。
- Qty: 销售给客户的数量。
- SaleDate: 销售完成的日期。
控制器操作
var confRollUps = db.SaleConfirmation
.GroupBy(c => c.OfferId) // Ensure we get a list of unique/distinct offers
.Select(g => g.Select(i => new {
i.OfferId,
i.Product.Variety, // "Category" of product, will be the same across products for this offer. i.Product is a SQL Server Navigation property.
i.Offer.Price, // The price of the product, set per offer. i.Offer is a SQL Server Navigation property.
i.Offer.Quantity, // The quantity of items that are expected to be sold before the offer expires
i.Offer.DateClose, // Date of when the offer expires
g.Sum(ii => ii.Qty) // Sum up the Qty column, we don't care about ProdIds not matching
}));
选择查询中的错误是g.Sum(ii => ii.Qty),错误如下所示。
无效的匿名类型成员声明器。匿名类型成员必须使用成员赋值、简单名称或成员访问来声明。