C# 容器重用避免GC 的论证

            var lst = new List<int>();
            lst.Capacity = 100;
            var cnt = lst.Count;
            var cp = lst.Capacity;
            for(int i=0; i<30; ++i)
            {
                lst.Add(i);
                Console.WriteLine(i + "," + lst.Capacity + ",");//capacity总是100
                lst.Clear();//并不会改变Capacity的大小
            }

            lst.Clear();//并不会改变Capacity的大小
            var cnt2 = lst.Count;
            var cp2 = lst.Capacity;