实体框架5方法查询汇总

Question

我试图通过查询SaleConfirmation表获得已确认/最终购买的摘要,但我在方法语法查询方面遇到了很多困难.

数据库表
这是存储最终销售额的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:唯一的行ID.
• OfferId:链接到Offer/Sale表的外键.
• 产品:产品表中产品的ID.
• 数量:销售给客户的数量.
• SaleDate:销售最终确定的日期.

控制器动作

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
                   }));

select查询中的错误是g.Sum(ii => ii.Qty),错误如下.

无效的匿名类型成员声明符.必须使用成员分配,简单名称或成员访问声明匿名类型成员.

Answer 1

您只需要将匿名类型分配给变量,试试这个.

var confRollUps = db.SaleConfirmation
              .GroupBy(c => c.OfferId) // Ensure we get a list of unique/distinct offers
              .Select(g => g.Select(i => new {
                        OfferId = i.OfferId, 
                        ProductVariety = i.Product.Variety, // "Category" of product, will be the same across products for this offer. i.Product is a SQL Server Navigation property.
                        OfferPrice = i.Offer.Price, // The price of the product, set per offer. i.Offer is a SQL Server Navigation property.
                        OfferQty = i.Offer.Quantity, // The quantity of items that are expected to be sold before the offer expires
                        OfferDateClose =i.Offer.DateClose, // Date of when the offer expires
                        Total =g.Sum(ii => ii.Qty) // Sum up the Qty column, we don't care about ProdIds not matching
               }));