Math.Round（）十进制C＃

Question

I have a TimeSpan , ts .

When I use Math.Round(ts.TotalHours,2) it's returning 3,3 and that is correct.

I want to format my decimal to 3,33 -> 3,5

Like this:

3 hours = 3,0
3 hours and 10 minutes = 3,25
3 hours and 20 minutes = 3,5
3 hours and 35 minutes = 3,75
3 hours and 55 minutes = 4

Does any one have a good idea?

Answer 1

If you want to round the the nearest 0.25 you can simply multiply with 4, round, and divide by 4.

public static decimal RoundToQuarter(decimal x)
{
  return Math.Round(x*4)/4;
}

You should also think about which MidPointRounding behavior you want. ie what happens with values like 1/8 or 3/8 . Default is round-to-even, where 1/8 becomes 0 , and 3/8 becomes 0.5 .