三角型

  StringBuilder sb = new StringBuilder();
            for (int i = 1; i <= line; i++)
            {
                sb.Append(' ', line - i);
                sb.Append('^', i * 2 - 1);
                Console.WriteLine(sb.ToString());
                sb.Remove(0, sb.Length);
            }

            for (int i = 1; i < line; i++)
            {
                for (int k = 1; k <= line - i; k++)
                {
                    Console.Write(" ");
                }
                for (int j = 1; j <= i * 2 - 1; j++)
                {
                    Console.Write("&");
                }
                Console.WriteLine("");
            }