二进制格式不应该更改-对现有规范肯定是一个重大更改。正如Jimmy所说，它被定义为IEEE754 / IEC
60559：1989格式。（C＃3.0语言规范第1.3节； ECMA 335第8.2.2节）。DoubleConverter中的代码应该很好并且健壮。

为了将来参考，示例中代码的相关位为：

public static string ToExactString (double d)
{
    …

    // Translate the double into sign, exponent and mantissa.
    long bits = BitConverter.DoubleToInt64Bits(d);
    // Note that the shift is sign-extended, hence the test against -1 not 1
    bool negative = (bits & (1L << 63)) != 0;
    int exponent = (int) ((bits >> 52) & 0x7ffL);
    long mantissa = bits & 0xfffffffffffffL;

    // Subnormal numbers; exponent is effectively one higher,
    // but there's no extra normalisation bit in the mantissa
    if (exponent==0)
    {
        exponent++;
    }
    // Normal numbers; leave exponent as it is but add extra
    // bit to the front of the mantissa
    else
    {
        mantissa = mantissa | (1L << 52);
    }

    // Bias the exponent. It's actually biased by 1023, but we're
    // treating the mantissa as m.0 rather than 0.m, so we need
    // to subtract another 52 from it.
    exponent -= 1075;

    if (mantissa == 0) 
    {
        return negative ? "-0" : "0";
    }

    /* Normalize */
    while((mantissa & 1) == 0) 
    {    /*  i.e., Mantissa is even */
        mantissa >>= 1;
        exponent++;
    }

    …
}

当时的评论对我来说很有意义，但是我敢肯定我现在必须考虑一下。在第一部分之后，您将获得“原始”指数和尾数-其余代码仅有助于以一种更简单的方式对待它们。