为什么百分比格式说明符乘以 100? [英] Why does percentage format specifier multiply by 100?

问题描述

为什么百分比的 'p' 字符串格式在使用百分号格式化之前先将值乘以 100?

Why does the 'p' string format for percent multiply the value by 100 before formatting it with the percentage sign?

http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx#PFormatString

百分比(P")格式说明符

百分比(P")格式说明符将数字乘以 100 和将其转换为表示百分比的字符串. 精度说明符指示所需的小数位数.如果省略精度说明符，提供默认数值精度使用当前 PercentDecimalDigits 属性.

The percent ("P") format specifier multiplies a number by 100 and converts it to a string that represents a percentage. The precision specifier indicates the desired number of decimal places. If the precision specifier is omitted, the default numeric precision supplied by the current PercentDecimalDigits property is used.

有什么办法可以防止在格式化之前将值乘以100?而不是做:

Is there any way to prevent the value from being multiplied by 100 before formatting? Rather than doing:

(value / 100).ToString("p")

推荐答案

至于 why，percent"的字面意思是100%"，所以 50% 在数学上等同于 0.50.至于格式，为什么不加个百分号?

As to the why, "percent" literally means "out of one hundred", so 50% is mathematically equivalent to 0.50. As to formatting, why not just add a percent sign?

value + "%"

...或类似的东西:

value.ToString("#.00\\%")

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