C#的字符串货币格式可以选择最多6个十进制数字吗? [英] Can C#'s string currency format optionally up to 6 decimal numbers?

问题描述

通过快速测试，C#的货币格式似乎不支持可选的小数位.

With a quick test C#'s currency format doesn't appear to support optional decimal places.

CultureInfo ci = new CultureInfo("en-US");
String.Format(ci, "{0:C2}", number); // Always 2 decimals
String.Format(ci, "{0:C6}", number); // Always 6 decimals

尝试自定义它不起作用.

Trying to customize it doesn't work.

String.Format(ci, "{0:C0.00####}", number); // two decimals always, 4 optional

是否可以使用带有可选小数位数的货币格式?

Is it possible to use the currency format with an optional number of decimals?

例如像这样显示$ 199.99或$ 0.009999或$ 5.00.

e.g. $199.99 or $0.009999 or $5.00 are shown like this.

推荐答案

有点麻烦，但是您可以先计算小数位数.然后，您可以使用该数字形成格式字符串.

It's a bit long-winded, but you could first calculate the number of decimal places. Then, you can use that number to form your format string.

您将需要此实用程序功能(贷记给一个名叫Joe的家伙):

You'll need this utility function (credits go to a guy by the name of Joe):

private int CountDecimalPlaces(decimal value)
{
    value = decimal.Parse(value.ToString().TrimEnd('0'));
    return BitConverter.GetBytes(decimal.GetBits(value)[3])[2];
}

然后您可以按照以下步骤进行操作:

Then you can do something along these lines:

decimal number = 5.0M;

CultureInfo ci = CultureInfo.CurrentCulture;

NumberFormatInfo nfi = ci.NumberFormat.Clone() as NumberFormatInfo;

// Count the decimal places, but default to at least 2 decimals
nfi.CurrencyDecimalDigits = Math.Max(2 , CountDecimalPlaces(number));

// Apply the format string with the specified number format info
string displayString = string.Format(nfi, "{0:c}", number);

// Ta-da
Console.WriteLine(displayString);

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