public virtual void AddItem(MusicProduct product, int quantity) { CartLine line = lineCollection.Where(p => p.Product.MusicID == product.MusicID).FirstOrDefault(); if (line == null) { lineCollection.Add(new CartLine { Product = product, Quantity = quantity }); } else { line.Quantity += quantity; } }
public virtual void RemoveLine(MusicProduct product) => lineCollection.RemoveAll(l => l.Product.MusicID == product.MusicID);