55 lines
1.7 KiB
C#
55 lines
1.7 KiB
C#
|
|
|||
|
|
using System;
|
|||
|
|
using shortid.Configuration;
|
|||
|
|
|
|||
|
|
namespace Sicentury.Core
|
|||
|
|
{
|
|||
|
|
public class GlobalDefs
|
|||
|
|
{
|
|||
|
|
/// <summary>
|
|||
|
|
/// 比较两个Double型变量是否相等时的最小误差值。
|
|||
|
|
/// </summary>
|
|||
|
|
public const double DBL_VAL_COMPARISION_TOLERANCE = 1e-6;
|
|||
|
|
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// 比较两个Double型变量是否相等。
|
|||
|
|
/// <para>注意：未考虑NaN和Infinity情况。</para>
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="a"></param>
|
|||
|
|
/// <param name="b"></param>
|
|||
|
|
/// <param name="tolerance"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
|
|||
|
|
public static bool IsDoubleValueEquals(double a, double b, double tolerance = DBL_VAL_COMPARISION_TOLERANCE)
|
|||
|
|
{
|
|||
|
|
return Math.Abs(a - b) < tolerance;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// 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。
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="str"></param>
|
|||
|
|
/// <param name="valueIfFault"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static double TryParseToDouble(string str, double valueIfFault = 0)
|
|||
|
|
{
|
|||
|
|
var ret = double.TryParse(str, out var dbv);
|
|||
|
|
if (ret == false)
|
|||
|
|
dbv = valueIfFault;
|
|||
|
|
return dbv;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// 获取指定长度和格式的唯一识别码。
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="length"></param>
|
|||
|
|
/// <param name="isUseNumber"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string GetShortUid(int length = 8, bool isUseNumber = true)
|
|||
|
|
{
|
|||
|
|
return shortid.ShortId.Generate(new GenerationOptions(isUseNumber, false, length));
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|