Console.WriteLine("请输入要打印的行数：");
            int n = Convert.ToInt32(Console.ReadLine());
            Console.Clear(); //清除以上显示的内容
            string row = "";
            //这层循环控制打印的行数
            for (int i = 1; i <= n; i++)
            {
                //这层循环控制每行前面打印*的个数
                for (int j = 1; j <= 2 * i - 1; j++)
                {
                    // Console.Write("*");
                    row += "*";
                }
                //每打印完一行换一下行
                //设置打印出来的*居中显示
                Console.SetCursorPosition((Console.WindowWidth - row.Length) / 2, i);
                Console.WriteLine(row);
                row = "";
            }