C# String.Format("{0:C2}", -1234)（货币格式）将负数视为正数
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/1001114/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
String.Format("{0:C2}", -1234) (Currency format) treats negative numbers as positive
提问by Shimmy Weitzhandler
I am using String.Format("{0:C2}", -1234)to format numbers.
我正在使用String.Format("{0:C2}", -1234)格式化数字。
It always formats the amount to a positive number, while I want it to become $ -1234
它总是将金额格式化为正数，而我希望它变成 $ -1234
采纳答案by Shimmy Weitzhandler
I think I will simply use:
我想我会简单地使用：
FormatCurrency(-1234.56, 2, UseParensForNegativeNumbers:=TriState.False)
(in Microsoft.VisualBasic.Strings module)
（在 Microsoft.VisualBasic.Strings 模块中）
Or in shorter words (this is what im actually going to use):
或者用更短的话说（这是我实际要使用的）：
FormatCurrency(-1234.56, 2, 0, 0)
Or I will make myself a custom formatcurrency function that uses the VB function passing my custom params.
或者我将使自己成为一个自定义格式货币函数，该函数使用传递我的自定义参数的 VB 函数。
For further details take a look at the FormatCurrency Function (Visual Basic)in the msdn.
有关更多详细信息，请查看msdn中的FormatCurrency 函数 (Visual Basic)。
回答by Jon Skeet
Am I right in saying it's putting it in brackets, i.e. it's formatting it as ($1,234.00)? If so, I believe that's the intended behaviour for the US.
我说它把它放在括号里是对的，即将它格式化为($1,234.00)？如果是这样，我相信这就是美国的预期行为。
However, you can create your own NumberFormatInfowhich doesn't behave this way. Take an existing NumberFormatInfowhich is "mostly right", call Clone()to make a mutable copy, and then set the CurrencyNegativePatternappropriately (I think you want value 2).
但是，您可以创建自己的NumberFormatInfo不以这种方式运行的。取一个NumberFormatInfo“基本正确”的现有文件，调用Clone()创建一个可变副本，然后CurrencyNegativePattern适当地设置（我认为您想要值 2）。
For example:
例如：
using System;
using System.Globalization;
class Test
{
static void Main()
{
var usCulture = CultureInfo.CreateSpecificCulture("en-US");
var clonedNumbers = (NumberFormatInfo) usCulture.NumberFormat.Clone();
clonedNumbers.CurrencyNegativePattern = 2;
string formatted = string.Format(clonedNumbers, "{0:C2}", -1234);
Console.WriteLine(formatted);
}
}
This prints $-1,234.00. If you actually want exactly $-1234, you'll need to set the CurrencyGroupSizesproperty to new int[]{0}and use "{0:C0}"instead of "{0:C2}"as the format string.
这将打印 $-1,234.00。如果您确实想要 $-1234，则需要将该CurrencyGroupSizes属性设置为new int[]{0}并使用"{0:C0}"而不是"{0:C2}"作为格式字符串。
EDIT: Here's a helper method you can use which basically does the same thing:
编辑：这是您可以使用的辅助方法，它基本上执行相同的操作：
private static readonly NumberFormatInfo CurrencyFormat = CreateCurrencyFormat();
private static NumberFormatInfo CreateCurrencyFormat()
{
var usCulture = CultureInfo.CreateSpecificCulture("en-US");
var clonedNumbers = (NumberFormatInfo) usCulture.NumberFormat.Clone();
clonedNumbers.CurrencyNegativePattern = 2;
return clonedNumbers;
}
public static string FormatCurrency(decimal value)
{
return value.ToString("C2", CurrencyFormat);
}
回答by epotter
Another simple option is manually specify the format string.
另一个简单的选项是手动指定格式字符串。
String.Format("{0:$#,##0.00}", -1234)
Or, if the currency symbol needs to be a parameter, you could do this
或者，如果货币符号需要作为参数，您可以这样做
String.Format("{0:" + symbol + "#,##0.00}", -1234)
回答by Pawan Kumar Prajapati
#region Format value to currency
/// <summary>
/// Method to format input in currency format
/// Input: -12345.55
/// Output:$-12,345.55
/// </summary>
/// <param name="Input"></param>
/// <returns></returns>
public static string FormatToCurrency(string Input)
{
try
{
decimal value = Convert.ToDecimal(Input);
CultureInfo culture = CultureInfo.CreateSpecificCulture("en-US");
culture.NumberFormat.NumberNegativePattern = 2;
return string.Format(culture, "{0:C}", value);
}
catch (Exception)
{
return string.Empty;
}
}
#endregion
