C# list 取出重复的数据

List<A> aList = new List<A>() { new A(){ ID = 1, Phone= 123 }, new A(){ ID = 2, Phone= 222 }, new A(){ ID = 3, Phone= 333 }, new A(){ ID = 4, Phone= 123 }, }; 我要取出 new A(){ ID = 1, Phone= 123 }, new A(){ ID = 4, Phone= 123 }, 也就是Phone 相同的，用Linq 。。。该怎么做呀，虚心求教。。我已经研究了好长时间了。。。
	from l in list group l by l.Phone into g where g.Count()>0 select g;
20分	from l in list group l by l.Phone into g where g.Count()>1 select g; 上面写错了，要改成>1
20分	var result = from r in lst group r by r.Phone into g where g.Count() > 1 select g; //遍历分组结果集 foreach (var item in result) { foreach (A u in item) { Console.WriteLine(u.ID); } }
	2楼3楼是一个方法，也是正确的
	太感谢你们了。。谢谢。。我去试试