如何格式化小数点后面不跟零的 [英] How to format a decimal without trailing zero's

问题描述

我刚刚得知一个小数莫名其妙地记得零的是需要多少trailaing存储号码。与其他词：它会记住分数的大小

I've just learned that a decimal somehow remembers how much trailaing zero's were needed to store a number. With other words: it remembers the size of the fraction.

例如：

123M.ToString() ==> resuls in: 123
123.00M.ToString() ==> resuls in: 123.00
123.450M.ToString() ==> resuls in: 123.450

我要寻找一个格式化字符串或其他TRIC摆脱那些不必要的尾随零的，但保持显著数字。所以：

I am looking for a formatting string or another tric to get rid of those "unneeded" trailing zero's, but keeping the significant digits. So:

123M.ToString() ==> resuls in: 123
123.00M.ToString() ==> resuls in: 123
123.450M.ToString() ==> resuls in: 123.45

删除零的在新的字符串的结尾是不是对我来说是真正的选择，因为那时我必须找出如果字符串包含一小部分，如果是这样，这取决于文化也必须删除可选的'。'或'，'。等等。

Removing the zero's at the end of the new string is not a real option for me, because then I have to find out if the string contains a fraction and if so, also have to remove the optional '.' or ',' depending on the culture. Etc.

推荐答案

有几种方法可以做到这一点，但因为你是无论如何转换为一个String对象，我想你可以尝试是这样的：

There are several ways to do it, but since you are converting to a String object anyway, I suppose you could try something like this:

myDecimalVariable.toString（G29）;

或使用上面的代码，假设 123.00M 是十进制的：

or, using your code above, assuming 123.00M is your decimal:

123.00M.toString（G29）;

下面是一些例子简洁如何工作的解释：

Here is the explanation of how that concise example works:

与G的位数格式意味着格式化，很多显著
位。因为29是一个小数可以
已，这将有效地截断没有
四舍五入的尾随零的最显著的数字。

The G format with a number means to format that many significant digits. Because 29 is the most significant digits that a Decimal can have, this will effectively truncate the trailing zeros without rounding.

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