Linq to SQL .Sum() without group ... into

问题描述

我有这样的事情:

var itemsInCart = from o in db.OrderLineItems
                  where o.OrderId == currentOrder.OrderId
                  select new { o.OrderLineItemId, ..., ..., o.WishListItem.Price}

有什么办法可以做到

itemsCart.Sum() //not sure what to pass into the function

要获得 o.WishListItem.Price 的总和还是我必须获得另一个 iQueryable<T> 从数据库中带组...进入?

to get the sum of o.WishListItem.Price or do i have to get another iQueryable< T> from the database with group ... into?

推荐答案

What about:

What about:

itemsInCart.AsEnumerable().Sum(o=>o.Price);

AsEnumerable 有所不同，此查询将在本地执行(Linq To Objects).

AsEnumerable makes the difference, this query will execute locally (Linq To Objects).

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