43 lines
1.3 KiB
C#
43 lines
1.3 KiB
C#
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using System;
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namespace Sicentury.Core
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{
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public class GlobalDefs
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{
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/// <summary>
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/// 比较两个Double型变量是否相等时的最小误差值。
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/// </summary>
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public const double DBL_VAL_COMPARISION_TOLERANCE = 1e-6;
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/// <summary>
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/// 比较两个Double型变量是否相等。
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/// <para>注意：未考虑NaN和Infinity情况。</para>
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/// </summary>
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/// <param name="a"></param>
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/// <param name="b"></param>
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/// <param name="tolerance"></param>
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/// <returns></returns>
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public static bool IsDoubleValueEquals(double a, double b, double tolerance = DBL_VAL_COMPARISION_TOLERANCE)
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{
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return Math.Abs(a - b) < tolerance;
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}
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/// <summary>
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/// 尝试将制定的字符串转换为Double型。如果转换失败，返回默认值。
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/// </summary>
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/// <param name="str"></param>
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/// <param name="valueIfFault"></param>
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/// <returns></returns>
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public static double TryParseToDouble(string str, double valueIfFault = 0)
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{
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var ret = double.TryParse(str, out var dbv);
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if (ret == false)
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dbv = valueIfFault;
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return dbv;
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}
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}
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}
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