升序：

 public static List<int> BubbleSortAsc(List<int> list)
        {
            for (int i = 0; i < list.Count - 1; i++)
            {
                for (int j = 0; j < list.Count-1-i; j++)
                {
                    if (list[j] > list[j + 1])
                    {
                        
 
int temp = list[j + 1];
                        list[j + 1] = list[j];
                        list[j] = temp;
                    }
                }
                Console.Write($"第{i + 1}遍：");
                foreach (var item in list)
                {
                    Console.Write(item + "
 
  ");
                }
                Console.WriteLine();
            }
            return list;
        }

降序：

public static List<int> BubbleSortDesc(List<int> list)
        {
            for (int i = 0; i < list.Count-1; i++)
            {
                for (int j = list.Count-1
 
; j > i; j--)
                {
                    if (list[j] > list[j - 1])
                    {
                        int temp = list[j];
                        list[j] = list[j - 1];
                        list[j - 1] = temp;
                    }
                }
                Console.Write($"第{i+1}遍：");
                foreach (var item in list)
                {
                    Console.Write(item + "  ");
                }
                Console.WriteLine();
            }
            return list;
        }