Math.Round的枚举参数

public enum MidpointRounding

Fields

TABLE 1

AwayFromZero	1	When a number is halfway between two others, it is rounded toward the nearest number that is away from zero.
ToEven	0	When a number is halfway between two others, it is rounded toward the nearest even number.
ToNegativeInfinity	3	When a number is halfway between two others, it is rounded toward the result closest to and no greater than the infinitely precise result.
ToPositiveInfinity	4	When a number is halfway between two others, it is rounded toward the result closest to and no less than the infinitely precise result.
ToZero	2	When a number is halfway between two others, it is rounded toward the result closest to and no greater in magnitude than the infinitely precise result.