218 lines
7.3 KiB
C#
218 lines
7.3 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Threading.Tasks;
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namespace JSMachine.WMS.Common.Helper
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{
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public static class MathExtensions
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{
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/// <summary>
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/// 四舍五入（适用decimal类型）
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/// </summary>
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/// <param name="d">要舍入的小数</param>
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/// <param name="decimals">保留的小数位（负数则不处理）</param>
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/// <returns></returns>
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public static decimal Round(decimal? d, int decimals = 2)
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{
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if (!d.HasValue)
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return 0;
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return decimals < 0 ? d.Value : Math.Round(d.Value, decimals, MidpointRounding.AwayFromZero);
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}
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/// <summary>
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/// 数学函数扩展-幂运算xⁿ
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/// </summary>
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/// <param name="x">底数</param>
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/// <param name="n">指数</param>
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/// <param name="decimals">保留的小数位（负数则不处理）</param>
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/// <returns></returns>
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public static decimal Pow(decimal x, decimal n, int decimals = -1)
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{
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decimal result = (decimal)Math.Pow((double)x, (double)n);
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return Round(result, decimals);
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}
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/// <summary>
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/// 数学函数扩展-安全除
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/// </summary>
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/// <param name="first">被除数</param>
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/// <param name="second">除数</param>
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/// <param name="decimals">保留的小数位（负数则不处理）</param>
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/// <returns></returns>
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public static decimal Division(decimal first, decimal second, int decimals = -1)
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{
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decimal result = second == 0 ? 0 : (first / second);
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return Round(result, decimals);
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}
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/// <summary>
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/// 数学函数扩展-安全除
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/// </summary>
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/// <param name="first">被除数</param>
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/// <param name="second">除数</param>
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/// <returns></returns>
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public static int Division(int first, int second)
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{
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int result = second == 0 ? 0 : (first / second);
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return result;
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}
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/// <summary>
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/// 数学函数扩展-安全取余 DY20210312
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/// </summary>
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/// <param name="first">被除数</param>
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/// <param name="second">除数</param>
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/// <returns></returns>
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public static int Remainder(int first, int second)
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{
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int result = second == 0 ? 0 : (first % second);
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return result;
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}
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/// <summary>
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/// 向下取整
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/// </summary>
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/// <param name="first">被除数</param>
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/// <param name="second">除数</param>
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/// <returns></returns>
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public static int Floor(int first, int second)
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{
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decimal result = second == 0 ? 0 : (first / second);
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return (int)Math.Floor(result);
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}
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/// <summary>
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/// 向下取整
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/// </summary>
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/// <param name="first">被除数</param>
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/// <param name="second">数据</param>
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/// <returns></returns>
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public static int Floor(decimal first, decimal second)
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{
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decimal result = second == 0 ? 0 : (Convert.ToDecimal(first) / Convert.ToDecimal(second));
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//判断是否整除
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if (!StringCheck(result.ToString()))
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{
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return (int)Math.Floor(result) - 1;
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}
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return (int)result;
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}
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/// <summary>
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/// 安全除（计算结果为正负无穷大时，返回0）
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/// </summary>
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/// <param name="first">被除数</param>
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/// <param name="second">除数</param>
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/// <param name="decimals">保留的小数位（负数则不处理）</param>
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/// <returns></returns>
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public static double Division(double first, double second, int decimals = -1)
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{
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// double类型不能直接判断0，会有精度丢失
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// 而当除数=0时，计算结果=正负无穷大，并不会报错
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if (second == 0)
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{
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return 0;
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}
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else
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{
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double result = first / second;
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result = double.IsInfinity(result) ? 0 : result;
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return decimals < 0 ? result : Math.Round(result, decimals);
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}
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}
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/// <summary>
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/// 两个数据是否相等
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/// </summary>
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/// <param name="first"></param>
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/// <param name="second"></param>
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/// <param name="decimals">保留位数</param>
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/// <param name="threshold">阀值</param>
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/// <returns></returns>
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public static bool IsEqual(decimal first, decimal second, int decimals = 2, decimal threshold = 0.001m)
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{
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return Math.Abs(Math.Round(first, decimals) - Math.Round(second, decimals)) <= threshold;
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}
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/// <summary>
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/// 向上取整
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/// </summary>
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/// <param name="first">被除数</param>
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/// <param name="second">除数</param>
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/// <returns></returns>
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public static int Up(int first, int second)
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{
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decimal result = second == 0 ? 0 : (Convert.ToDecimal(first) / Convert.ToDecimal(second));
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//判断是否整除
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if (result.ToString().Contains("."))
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return (int)Math.Floor(result) + 1;
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return (int)result;
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}
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/// <summary>
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/// 向上取整
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/// </summary>
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/// <param name="first">被除数</param>
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/// <param name="second">除数</param>
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/// <returns></returns>
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public static int Up(double first, int second)
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{
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decimal result = second == 0 ? 0 : (Convert.ToDecimal(first) / Convert.ToDecimal(second));
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//判断是否整除
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if (result.ToString().Contains("."))
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return (int)Math.Floor(result) + 1;
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return (int)result;
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}
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/// <summary>
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/// 向上取整
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/// </summary>
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/// <param name="first">被除数</param>
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/// <param name="second">数据</param>
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/// <returns></returns>
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public static int Up(decimal first, decimal second)
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{
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decimal result = second == 0 ? 0 : (Convert.ToDecimal(first) / Convert.ToDecimal(second));
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//判断是否整除
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if (!StringCheck(result.ToString()))
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{
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return (int)Math.Floor(result) + 1;
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}
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return (int)result;
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}
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/// <summary>
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///判断最终结果，.Contains(".")作为判断依据是不对的，15.0000就会变成16，是错的
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/// </summary>
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/// <param name="result"></param>
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/// <returns></returns>
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public static bool StringCheck(string result)
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{
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string[] sArray = result.Split(".");
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if (sArray.Length >= 2)
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{
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Regex r;
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string pattern;
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pattern = @"1|2|3|4|5|6|7|8|9";
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r = new Regex(pattern);
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if (r.IsMatch(sArray[1]))
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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else
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{
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return true;
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}
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}
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}
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}
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