将数字格式化为始终有符号和小数分隔符

沃梦达教程 C#/.NET问题

2022-01-01 6

Format a number to always have a sign and decimal separator(将数字格式化为始终有符号和小数分隔符)

本文介绍了将数字格式化为始终有符号和小数分隔符的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

I want to format any number (integer or real) to a string representation which always has a sign (positive or negative) and a decimal separator, but no trailing zeroes.

Some samples:

3.14 => +3.14
12.00 => +12.
-78.4 => -78.4
-3.00 => -3.

Is it possible with one of the default ToString() implementations, or do I need write this myself?

解决方案

Try something like this:

double x = -12.43;
string xStr = x.ToString("+0.#####;-0.#####");

But this wouldn't help to display trailing decimal point. You can handle such situations using this method:

public static string MyToString(double x)
{
    return x == Math.Floor(x)
        ? x.ToString("+0;-0;0") + CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator
        : x.ToString("+0.####;-0.####");
}