小数部に残された末尾のゼロを除去する、カウントする

private void button_Click(object sender, EventArgs e)
{
    // 除去する
    Debug.WriteLine(truncate_trailing_zeros(1040000.00M)); // -> 1040000
    Debug.WriteLine(truncate_trailing_zeros(1050000.00M)); // -> 1050000
    Debug.WriteLine(truncate_trailing_zeros(10.0000400M)); // -> 10.00004
    Debug.WriteLine(truncate_trailing_zeros(10.0000500M)); // -> 10.00005

    // カウントする
    Debug.WriteLine(count_trailing_zeros(0.4400M)); // -> 2
    Debug.WriteLine(count_trailing_zeros(1.0000M)); // -> 4
    Debug.WriteLine(count_trailing_zeros(1.0001M)); // -> 0
    Debug.WriteLine(count_trailing_zeros(100.00M)); // -> 2
}

public static decimal truncate_trailing_zeros(decimal value)
{
    return value / 1.0000000000000000000000000000M;
}

public static int count_trailing_zeros(decimal value)
{
    return (decimal.GetBits(Math.Abs(value))[3] >> 16 & 0x0FF) - (decimal.GetBits(truncate_trailing_zeros(value))[3] >> 16 & 0x0FF);

    /*var decimal_part = decimal.GetBits(Math.Abs(value))[3] >> 16 & 0x0FF;

    var last = -1;
    for (int i = 0; i <= decimal_part; i++)
    {
        var sample = (decimal)Math.Pow(10, -i) * (decimal)Math.Pow(10, i);
        var current = decimal.GetBits(value / sample)[3] >> 16 & 0x0FF;

        if(last == current)
        {
            return i - 1;
        }
        last = current;
    }

    return decimal_part;*/
}