如何将小数舍入到C#中的特定分数？

double originalNumber = 3.14159;
int decimalPlaces = 2;
double roundedNumber = Math.Round(originalNumber, decimalPlaces);
Console.WriteLine("Original number: " + originalNumber);
Console.WriteLine("Rounded number: " + roundedNumber);

double originalNumber = 3.14159;
double roundedNumber = Math.Floor(originalNumber);
Console.WriteLine("Original number: " + originalNumber);
Console.WriteLine("Rounded number: " + roundedNumber);

Original number: 3.14159
Rounded number: 3

double originalNumber = 3.14159;
double roundedNumber = Math.Ceiling(originalNumber);
Console.WriteLine("Original number: " + originalNumber);
Console.WriteLine("Rounded number: " + roundedNumber);

Original number: 3.14159
Rounded number: 4