// Admin.NET 项目的版权、商标、专利和其他相关权利均受相应法律法规的保护。使用本项目应遵守相关法律法规和许可证的要求。
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//
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// 本项目主要遵循 MIT 许可证和 Apache 许可证（版本 2.0）进行分发和使用。许可证位于源代码树根目录中的 LICENSE-MIT 和 LICENSE-APACHE 文件。
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//
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// 不得利用本项目从事危害国家安全、扰乱社会秩序、侵犯他人合法权益等法律法规禁止的活动！任何基于本项目二次开发而产生的一切法律纠纷和责任，我们不承担任何责任！
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using System.Globalization;
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namespace Admin.NET.Core;
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using System;
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/// <summary>
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/// 安全的基本数学运算方法类
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/// </summary>
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public static class SafeMath
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{
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/// <summary>
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/// 安全加法
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/// </summary>
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/// <param name="left">左操作数</param>
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/// <param name="right">右操作数</param>
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/// <param name="precision">保留小数位数</param>
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/// <param name="defaultValue">默认值</param>
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/// <param name="throwOnError">是否抛出异常</param>
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/// <returns></returns>
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public static T Add<T>(object left, object right, int precision = 2, T defaultValue = default, bool throwOnError = true) where T : struct, IComparable, IConvertible, IFormattable
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{
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return PerformOperation(left, right, (a, b) => a + b, precision, defaultValue, throwOnError);
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}
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/// <summary>
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/// 安全减法
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/// </summary>
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/// <param name="left">左操作数</param>
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/// <param name="right">右操作数</param>
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/// <param name="precision">保留小数位数</param>
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/// <param name="defaultValue">默认值</param>
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/// <param name="throwOnError">是否抛出异常</param>
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public static T Sub<T>(object left, object right, int precision = 2, T defaultValue = default, bool throwOnError = true) where T : struct, IComparable, IConvertible, IFormattable
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{
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return PerformOperation(left, right, (a, b) => a - b, precision, defaultValue, throwOnError);
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}
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/// <summary>
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/// 安全乘法
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/// </summary>
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/// <param name="left">左操作数</param>
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/// <param name="right">右操作数</param>
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/// <param name="precision">保留小数位数</param>
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/// <param name="defaultValue">默认值</param>
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/// <param name="throwOnError">是否抛出异常</param>
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public static T Mult<T>(object left, object right, int precision = 2, T defaultValue = default, bool throwOnError = true) where T : struct, IComparable, IConvertible, IFormattable
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{
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return PerformOperation(left, right, (a, b) => a * b, precision, defaultValue, throwOnError);
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}
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/// <summary>
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/// 安全除法
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/// </summary>
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/// <param name="left">左操作数</param>
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/// <param name="right">右操作数</param>
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/// <param name="precision">保留小数位数</param>
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/// <param name="defaultValue">默认值</param>
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/// <param name="throwOnDivideByZero">是否抛出除以零异常</param>
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public static T Div<T>(object left, object right, int precision = 2, T defaultValue = default, bool throwOnDivideByZero = true) where T : struct, IComparable, IConvertible, IFormattable
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{
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return PerformOperation(left, right, (a, b) =>
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{
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if (b != 0) return a / b;
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if (throwOnDivideByZero) throw new DivideByZeroException("除数不能为0");
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return SafeConvert<decimal>(defaultValue);
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}, precision, defaultValue, throwOnDivideByZero);
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}
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/// <summary>
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/// 安全类型转换
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/// </summary>
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/// <param name="value">数据源</param>
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/// <param name="defaultValue">默认值</param>
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public static T SafeConvert<T>(object value, T defaultValue = default) where T : struct, IComparable, IConvertible, IFormattable
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{
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if (value == null) return defaultValue;
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try
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{
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return (T)Convert.ChangeType(value, typeof(T));
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}
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catch
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{
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return defaultValue;
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}
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}
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/// <summary>
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/// 执行数学运算
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/// </summary>
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private static T PerformOperation<T>(object left, object right, Func<decimal, decimal, decimal> operation, int precision, T defaultValue, bool throwOnError) where T : struct, IComparable, IConvertible, IFormattable
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{
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try
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{
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decimal leftValue = ConvertToDecimal(left);
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decimal rightValue = ConvertToDecimal(right);
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decimal result = operation(leftValue, rightValue);
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return SafeConvert(Math.Round(result, precision, MidpointRounding.AwayFromZero), defaultValue);
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}
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catch
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{
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if (throwOnError) throw;
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return defaultValue;
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}
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}
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/// <summary>
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/// 将输入值转换为 decimal
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/// </summary>
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public static decimal ConvertToDecimal(object value)
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{
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return value switch
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{
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null => 0m,
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int intValue => intValue,
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float floatValue => (decimal)floatValue,
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double doubleValue => (decimal)doubleValue,
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decimal decimalValue => decimalValue,
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long longValue => longValue,
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short shortValue => shortValue,
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byte byteValue => byteValue,
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string stringValue when decimal.TryParse(stringValue, NumberStyles.Any, CultureInfo.InvariantCulture, out decimal parsedValue) => parsedValue, // 尝试解析字符串
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_ => throw new InvalidCastException($"不支持的类型: {value.GetType().Name}")
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};
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}
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}
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