使用Linq一般扁平化XDocument？

XElement xml = XElement.Load("data.xml");
IEnumerable<Product> products = from product in xml.Elements("Product")
                                   select new Product {
                                       Name = product.Attribute("name").Value,
                                       Price = product.Attribute("price").Value
                                   };

XElement xml = XElement.Load("data.xml");
IEnumerable<Product> products = xml.XPathSelectElements("//Product");

XElement xml = XElement.Load("data.xml");
IEnumerable<Product> products = xml.Elements("Product");