从另一个IEnumerable中提取IEnumerable

Question

我有3个类,具有以下属性:

OfferList类:

Guid Id
IEnumerable<Offer> Offers

优惠等级:

Guid Id
Product Product

产品类别:

Guid Id

OfferList包含多个Offer,而Offer具有精确的1个产品.

如何获得包含OfferList的所有产品的IEnumerable？

OfferList offerList = this.GetOfferList(id);
IEnumerable<Product> products = offerList.Offers.SelectMany?

Answer 1

你只需要投射:

IEnumerable<Product> products = offerList.Offers.Select(o => o.Product);