基于Lambda的LinQ和群

帮我把它转换成lambda

select 
    Orders.Order_Date as date, sum(Amount) as amount
from 
    Orders 
inner join 
    OrderDetails on Orders.Order_ID = OrderDetails.Order_ID
where 
    Order_Date<= '2017-02-10' and Order_Date<= '2017-02-11'
group by 
    (Order_Date)
order by 
    date asc

选择
Orders.Order_日期为日期，总和（金额）为金额
从…起
命令
内连接
OrderDetails on Orders.Order\u ID=OrderDetails.Order\u ID
哪里
订单日期o.订单日期>=开始日期）
其中（o=>o.Order\u Date假设金额是OrderDetails的成员

var ba = db.Orders
  .Include(o => o.OrderDetails)
  .Where(o => o.Order_Date >= startDate)
  .Where(o => o.Order_Date <= endDate)
  .GroupBy(o => o.Order_Date)
  .Select(s => new {
    date = s.Key,
    amount = s.Sum(o => o.OrderDetails.Sum(od => od.Amount)),
  });

var ba=db.Orders
.Include（o=>o.OrderDetails）
.其中（o=>o.Order\U Date>=startDate）
.其中（o=>o.Order\u Date o.Order\u Date）
。选择（s=>new{
日期=s.键，
amount=s.Sum（o=>o.OrderDetails.Sum（od=>od.amount）），
});
您在项目中同时使用EF4和EF6吗？@我会使用EF吗6@GertArnoldsr，下次我会展示更多infomation@GertArnold请帮助我解决此问题您的模型与查询无关。我假设
金额
在
订单详细信息
中，但谁能说出来？
var ba = db.Orders.Include(o => o.OrderDetails)
.Where(o => o.Order_Date >= startDate)
.Where(o => o.Order_Date <= endDate);

var ba = db.Orders
  .Include(o => o.OrderDetails)
  .Where(o => o.Order_Date >= startDate)
  .Where(o => o.Order_Date <= endDate)
  .GroupBy(o => o.Order_Date)
  .Select(s => new {
    date = s.Key,
    amount = s.Sum(o => o.OrderDetails.Sum(od => od.Amount)),
  });