排序

{
                List<int> list = new List<int>() { 3, 1, 4, 2, 6, 5 };
                list.Sort(); //123456
            }

            {
                List<int> list = new List<int>() { 3, 1, 4, 2, 6, 5 };
                list.Sort((a, b) => { return a.CompareTo(b); }); //123456
            }

            {
                List<int> list = new List<int>() { 3, 1, 4, 2, 6, 5 };
                list.Sort((a, b) => { return a > b ? 1 : a < b ? -1 : 0; }); //123456
            }

            {
                List<int> list = new List<int>() { 3, 1, 4, 2, 6, 5 };
                list.Sort((a, b) => { return a > b ? -1 : a < b ? 1 : 0; }); //654321
            }