Math.Floor 总是舍去小数

            double result1 = Math.Floor(0.3);
            Console.WriteLine(result1);//result1显示0

            double result2 = Math.Floor(0.5);
            Console.WriteLine(result2);//result2显示0

            double result3 = Math.Floor(0.6);
            Console.WriteLine(result3);//result3显示0         

            Console.Read();