Linq查询非泛型集合要指定Student类型（比如List）

#region Linq to 集合查询非泛型集合要指定Student类型
            //ArrayList list = new ArrayList();
            //list.Add(new Student { Name = "Tom", Age = 17 });
            //list.Add(new Student { Name = "Jerry", Age = 16 });
            //list.Add(new Student { Name = "Marry", Age = 18 });
            //list.Add(new Student { Name = "Monika", Age = 22 });
            //list.Add(new Student { Name = "Frank", Age = 20 });
            //list.Add(new Student { Name = "Alex", Age = 15 });
            ////要指定Student类型
            //var result = from Student s in list
            //             where s.Name.Contains("M") && s.Age >= 18
            //             select s;

//foreach (Student stu in result)
            //{
            //    Console.WriteLine("学员姓名：{0},年龄:{1}", stu.Name, stu.Age.ToString());
            //}
            #endregion