C# 百分比值的格式小数？
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Format decimal for percentage values?
提问by Shimmy Weitzhandler
What I want is something like this:
我想要的是这样的：
String.Format("Value: {0:%%}.", 0.8526)
Where %% is that format provider or whatever I am looking for.
Should result: Value: %85.26..
其中 %% 是那种格式提供者或我正在寻找的任何东西。应该结果：Value: %85.26.。
I basically need it for wpf binding, but first let's solve the general formatting issue:
我基本上需要它来进行 wpf 绑定，但首先让我们解决一般的格式问题：
<TextBlock Text="{Binding Percent, StringFormat=%%}" />
采纳答案by Michael Haren
Use the Pformat string. This will vary by culture:
使用P格式字符串。这将因文化而异：
String.Format("Value: {0:P2}.", 0.8526) // formats as 85.26 % (varies by culture)
回答by Jon Schneider
If you have a good reason to set aside culture-dependent formatting and get explicit control over whether or not there's a space between the value and the "%", and whether the "%" is leading or trailing, you can use NumberFormatInfo's PercentPositivePatternand PercentNegativePatternproperties.
如果您有充分的理由搁置依赖于文化的格式并明确控制值和“%”之间是否有空格，以及“%”是前导还是尾随，您可以使用 NumberFormatInfo 的PercentPositivePattern和PercentNegativePattern属性。
For example, to get a decimal value with a trailing "%" and no space between the value and the "%":
例如，要获取带有尾随“%”且值和“%”之间没有空格的十进制值：
myValue.ToString("P2", new NumberFormatInfo { PercentPositivePattern = 1, PercentNegativePattern = 1 });
More complete example:
更完整的例子：
using System.Globalization;
...
decimal myValue = -0.123m;
NumberFormatInfo percentageFormat = new NumberFormatInfo { PercentPositivePattern = 1, PercentNegativePattern = 1 };
string formattedValue = myValue.ToString("P2", percentageFormat); // "-12.30%" (in en-us)
回答by Ian Townsend
I have found the above answer to be the best solution, but I don't like the leading space before the percent sign. I have seen somewhat complicated solutions, but I just use this Replace addition to the answer above instead of using other rounding solutions.
我发现上述答案是最好的解决方案，但我不喜欢百分号前的前导空格。我已经看到了一些复杂的解决方案，但我只是在上面的答案中使用了这个 Replace 补充，而不是使用其他舍入解决方案。
String.Format("Value: {0:P2}.", 0.8526).Replace(" %","%") // formats as 85.26% (varies by culture)
回答by David Neira
If you want to use a format that allows you to keep the number like your entry this format works for me:
"# \\%"
如果你想使用一种允许你像条目一样保留数字的格式，这种格式对我有用：
"# \\%"
回答by Nitika Chopra
This code may help you:
此代码可以帮助您：
double d = double.Parse(input_value);
string output= d.ToString("F2", CultureInfo.InvariantCulture) + "%";
