C#随机数生成字母金字塔

static void Main(string[] args)    {        showNpoint(25);      Console.ReadKey();    }    private static void showNpoint(int count)    {      Random r = new Random();      string[] strE = { "A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};      for (int i = 1; i <=count; i++)      {        for (int j = 1; j <=count-i; j++)        {          Console.Write(" ");        }        for (int k = 1; k <= 2*i-1; k++)        {          Console.Write(strE[r.Next(0,25)]);        }        Console.WriteLine();      }    }