Question

I want to be able to pull the last invoice containing a product in a category
Category->Product->Invoice

(from p as Product in cat
 where p.InvoiceList.Where(function(o) o.InvoiceDate >= MAX_ONE)
 select p.InvoiceList.Where(function(o) o.InvoiceDate >= MAX_ONE)
).FirstOrDefault()

I just can’t seem to wrap my head about how to get this done.

EDIT: a sample SQL statement that would accomplish my goal. If only I could translate it…

SELECT    TOP 1 i.InvoiceID, i.InvoiceDate, i.TotalAmount
FROM         Category as c INNER JOIN
                  Product as p ON p.categoryID = c.categoryID INNER JOIN
                  InvoiceProducts as ip ON ip.productID = p.productID INNER JOIN
                  Invoice as i ON ip.InvoiceID = i.InvoiceID 
WHERE     c.categoryID = 3
ORDER BY InvoiceDate DESC

Answer 1

cat.SelectMany(p => p.InvoiceList).OrderBy(o => o.InvoiceDate).LastOrDefault();