C#中Math.Round()实现中国式四舍五入
d(9.5) //result:10使用MidpointRounding.AwayFromZero重载后对比: Math.Round(0.4, MidpointRounding.AwayFromZero); // result:0
Math.Round(0.6, MidpointRounding.AwayFromZero); // result:1
Math.Round(0.5, MidpointRounding.AwayFromZero); // result:1
Math.Round(1.5, MidpointRounding.AwayFromZero); // result: