C＃Math.Round（值/ 2）。 值是十进制。 功能不适用于一个特定的数字4.5

Question

I am looking to round decimal, 0.1 to 0.4 round down and 0.5 to 0.9 round up tried these but for some reason if value is 4.5 it rounds to 4 and not 5 all other values work fine. 3.5=4.0 , 5.5=6.0 but 4.5 =4.0 expecting 5.0

Math.Round(value / 2)
Math.Round(Math.Round(value / 2),0, MidpointRounding.AwayFromZero)

Answer 1

Your first line is using the default type of rounding (known as banker's rounding). Your second line almost gets what you want, but you don't need to include two calls to Math.Round() .

For what you're wanting, it should probably look like this:

Math.Round((value / 2), 0, MidpointRounding.AwayFromZero)
// e.g. 3.5 => 4, 4.5 => 5, 5.5 => 6, etc.

Read more about banker's rounding here , and read more about Math.Round() here .