从EF select返回元组

Question

如何使用EF4在Select中检索元组？

        var productCount = (from product in context.products
                    select new Tuple<Product, int>(product, products.Orders.Count));

要么

        var productCount = (from product in context.products
                    select Tuple.Create(product, products.Orders.Count));

实体框架说第一种情况不能使用空构造函数,而第二种情况则不能识别Tuple.Create方法.

Answer 1

如何切换到投影的LINQ到对象:

var productCount = from product in context.products
                select new {Product = product, Count = products.Orders.Count };
var final = from item in productCount.AsEnumerable()
            select Tuple.Create(item.Product, item.Count);