你好，把你的代码进行修改后（把输出语句提取出来），如下：

        static void Main(string[] args)
        {
            int[] a = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
            int aa;

            //使用冒泡对数组进行降序排序
            for (int i = 0; i < a.Length; i++)
            {
                for (int j = 0; j < a.Length - i - 1; j++)
                {
                    if (a[j] < a[j + 1])
                    {
                        aa = a[j];
                        a[j] = a[j + 1];
                        a[j + 1] = aa;
                    }
                }

            }

            foreach (int n in a)
                Console.WriteLine(n);

            Console.Read();
        }