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52 lines
1.6 KiB
52 lines
1.6 KiB
3 years ago
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using System;
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namespace Binance.TradeRobot.Common.Extensions
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{
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public static class MathExtension
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{
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/// <summary>
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/// 四舍五入保留小数
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/// </summary>
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/// <param name="d"></param>
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/// <param name="length">保留的位数</param>
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/// <returns></returns>
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public static decimal Round(this decimal d, int length)
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{
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return Math.Round(d, length, MidpointRounding.AwayFromZero);
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}
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/// <summary>
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/// string转换decimal
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/// </summary>
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/// <param name="s"></param>
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/// <param name="length"></param>
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/// <returns></returns>
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public static decimal ToDecimal(this string s, int? length = null)
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{
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if (!decimal.TryParse(s, out decimal d))
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return 0M;
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if (length != null)
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return d.Round(length.Value);
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return d;
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}
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/// <summary>
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/// 截取小数位数,不进行四舍五入
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/// </summary>
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/// <param name="d"></param>
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/// <param name="length">截取的位数</param>
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/// <returns></returns>
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public static decimal CutDecimal(this decimal d, int length)
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{
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var dStr = d.ToString();
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var dotIndex = dStr.IndexOf(".");
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var cutLength = dotIndex + 1 + length;
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if (dotIndex == -1 || dStr.Length <= cutLength)
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dStr = string.Format($"{{0:F{length}}}", d);
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else
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dStr = dStr.Substring(0, cutLength);
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return decimal.Parse(dStr);
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}
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}
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}
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