c# - List only categories that have products -


i have database following structure:

categories
[pk]catid
catname

producttypes
[pk]typeid
typename

manufacturer
manufacturerid
name

products
[pk]prodid
title
typeid
manufacturerid
isdeleted (bool)
ishidden (bool)

producttypes "irrelevant" application, necessary export system.

i want nested list categories , products filtered on products.isdeleted , products.ishidden this

category 1
product.prodid - product.title, manufacturer.name ...

category 2
product.prodid - product.title, manufacturer.name ...

how in simplest way ef

var catlist = db.typeids.where(t => t.product.count() > 0).select(x => x.typecat).distinct().tolist();

this gives me categories, no filtering deleted/hidden products

instead of 

.where(t => t.product.count() > 0)

use

.where(t => t.product.any(u => !u.ishidden && !u.isdeleted))

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