泛型-利用泛型交换两个变量的值

Console.WriteLine("利用泛型交换两个变量的值！");
object a = "1", b = "2"; ;
List<object> list = new List<object>() { "1", "2" };
            list.ForEach(delegate(object o) { Console.WriteLine(o); });//list.ForEach(p => Console.WriteLine(p));
            object temp = list[0];//交换元素定义临时变量
            list.RemoveAt(0);//删除第一个,后一个元素自动往前补
            list.Add(temp);//交换完成
            list.ForEach(p => Console.WriteLine(p));
            Console.ReadKey();