是这样的：

XDocument doc = XDocument.Load("foo.xml");
var items = from list in doc.Descendants("LIST")
            from item in list.Elements("ITEM")
            select item;

这将应付多个LIST的元素，并不会发现，除非直接在清单一项目元素。如果你不关心那些细微之处，你可以只使用：

That will cope with multiple "LIST" elements, and won't find "ITEM" elements except directly under "LIST" ones. If you don't care about those finer points you could just use:

XDocument doc = XDocument.Load("foo.xml");
var items = doc.Descendants("ITEM");