在c#中对浮点数进行舍入

public static double Round(double value);
public static double Round(double value, int digits);
public static double Round(double value, MidpointRounding mode);
public static double Round(double value, int digits, MidpointRounding mode);

double number = 3.14159;

// 保留两位小数，采用默认的舍入方式
double rounded1 = Math.Round(number, 2); // 结果为3.14

// 保留整数位，采用远离零的舍入方式
double rounded2 = Math.Round(number, 0, MidpointRounding.AwayFromZero); // 结果为3

// 舍入到整数位，采用默认的舍入方式
double rounded3 = Math.Round(number, 0); // 结果为3