c# 获取数字的小数位数

2021-09-23 更新

/// <summary>
/// 获取小数位数
/// </summary>
/// <param name="decimalV">小数</param>
/// <returns></returns>
public int GetNumberOfDecimalPlaces(double decimalV)
{
    int result = 0;
    string[] temp = decimalV.ToString().Split(new char[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
    if (temp.Length == 2 && temp[1].Length > 0 && !temp[1].ToUpper().Contains("E"))
    {
        int index = temp[1].Length - 1;
        while (temp[1][index] == '0' && index-- > 0) ;
        result = index + 1;
    }
    else
    {
        temp = decimalV.ToString().Split(new char[] { '-' }, StringSplitOptions.RemoveEmptyEntries);
        if (temp.Length == 2 && temp[1].Length > 0)
        {
            result = int.Parse(temp[1]);
        }
        string s = temp[0].Substring(0, temp[0].Length - 1);
        temp = s.Split('.');
        if (temp.Length == 2 && temp[1].Length > 0)
        {
            int index = temp[1].Length - 1;
            while (temp[1][index] == '0' && index-- > 0) ;
            result = result + index + 1;
        }
    }
    return result;
}