https://knightzone.studio/2014/06/12/1601/csharpc%ef%bc%9a%e5%af%a6%e4%bd%9c%e5%a2%9e%e5%8a%a0array%e5%85%83%e7%b4%a0%e7%9a%84%e6%96%b9%e6%b3%95/