Question

I’ve already asked similar question but it was not very precise, so I will do it again.

Suppose I have a model where one entity includes other entity. Is there any way to access a property of child entity withing a linq query? Here is the example:

string category = "something";

IEnumerable<string> Items = _itemsRepository.GetItems()
                .Where(i => i.Product.Category == category)
                .OrderBy(i => i.ItemId);

In a clause “Where” I want to access child entity’s property “Category”, (this chunk of code doesn’t work). Table “Items” contains foreign key “ProductId” of table “Products”.
So here I want to select items which product’s category equals “something”. How can it be done?

Thank You in advance!

Answer 1

IEnumerable<Item> Items = _itemsRepository.GetItems()
                .Where(i => category == null || 
                           (i.Product != null && 
                            i.Product.Category == category))
                .OrderBy(i => i.ItemId);