C格式化货币

我看到了一个有趣的情况,四舍五入货币在C(与2008年SP1)。下面是测试用例的图像:

alt text http://img697.imageshack.us/img697/8500/testcases.png

我原以为第五、六和七种情况(我不擅长在输出中对它们进行编号)会把数字四舍五入到一便士。

这是我的测试代码:

static void Main(string[] args)
{
    decimal one = 10.994m;
    decimal two = 10.995m;
    decimal three = 1.009m;
    decimal four = 0.0044m;
    decimal five = 0.0045m;
    decimal six = 0.0046m;
    decimal seven = 0.0049m;
    decimal eight = 0.0050m;

    Console.WriteLine(one + ": " + one.ToString("C"));
    Console.WriteLine(two + ": " + two.ToString("C"));
    Console.WriteLine(three + ": " + three.ToString("C"));
    Console.WriteLine(four + ": " + four.ToString("C"));
    Console.WriteLine(five + ": " + five.ToString("C"));
    Console.WriteLine(six + ": " + six.ToString("C"));
    Console.WriteLine(seven + ": " + seven.ToString("C"));
    Console.WriteLine(eight + ": " + eight.ToString("C"));

    Console.ReadLine();
}

当我在.to string(字符串格式)中查看发生了什么时,我发现

public string ToString(string format)
{
    return Number.FormatDecimal(this, format, NumberFormatInfo.CurrentInfo);
}

它的使命是

[MethodImpl(MethodImplOptions.InternalCall)]
public static extern string FormatDecimal(
    decimal value, 
    string format, 
    NumberFormatInfo info);

这个调用中是否有逻辑表明numberformatinfo的当前区域性设置的粒度是currencity的两位小数,所以不要让第10000位的数字上卷,因为它无关紧要?

这个方法是如何实现的?我们是进入了比特转换区,还是发生了其他事情?

谢谢你的洞察力。