c#的 问题! 麻烦大神看看哪里出错了!

Question

 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;                    }                                 }                Console.Write(a[i] + "\t");             }