C# 字符串格式数字 千 123K、百万 123M、十亿 123B
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String Format Numbers Thousands 123K, Millions 123M, Billions 123B
提问by Mike U
Is there a way using a string formatter to format Thousands, Millions, Billions to 123K, 123M, 123B without having to change code to divide value by Thousand, Million or Billion?
有没有办法使用字符串格式化程序将千、百万、十亿格式化为 123K、123M、123B，而无需更改代码以将值除以千、百万或十亿？
String.Format("{0:????}", LargeNumber)
采纳答案by Daniel
There are different ways to achieve this, but for me the easiest and quickest is to use the "," custom specifier
有不同的方法可以实现这一点，但对我来说最简单快捷的是使用“,”自定义说明符
double value = 1234567890;
// Displays 1,234,567,890
Console.WriteLine(value.ToString("#,#", CultureInfo.InvariantCulture));
// Displays 1,234,568K
Console.WriteLine(value.ToString("#,##0,K", CultureInfo.InvariantCulture));
// Displays 1,235M
Console.WriteLine(value.ToString("#,##0,,M", CultureInfo.InvariantCulture));
// Displays 1B
Console.WriteLine(value.ToString("#,##0,,,B", CultureInfo.InvariantCulture));
回答by dtb
You can implement a ICustomFormatterthat divides the value by thousand, million or billion, and use it like this:
您可以实现一个ICustomFormatter将值除以千、百万或十亿，并像这样使用它：
var result = string.Format(new MyCustomFormatter(), "{0:MyFormat}", number);
回答by RAM
I use this mix of formats in an Extension Method(just add it to your project and enjoy)
我在扩展方法中使用这种混合格式（只需将其添加到您的项目中即可享受）
public static string ToKMB(this decimal num)
{
if (num > 999999999 || num < -999999999 )
{
return num.ToString("0,,,.###B", CultureInfo.InvariantCulture);
}
else
if (num > 999999 || num < -999999 )
{
return num.ToString("0,,.##M", CultureInfo.InvariantCulture);
}
else
if (num > 999 || num < -999)
{
return num.ToString("0,.#K", CultureInfo.InvariantCulture);
}
else
{
return num.ToString(CultureInfo.InvariantCulture);
}
}
Use:
用：
((decimal)235).ToKMB();
// 235
((decimal)1235).ToKMB();
// 1.2K
((decimal)6271235).ToKMB();
// 6.27M
((decimal)93246571235).ToKMB();
// 93.247B
Notes:
It return more detail for bigger numbers and I like it.
It support negative numbers too. (Thanks to @Dusty for his note in comments.
I write a method for
decimalnumbers in this example, you can write some override methods for it to supportint,longanddoubleto use it without any casting such as:
myIntNumber.ToKMB();
myLongNumber.ToKMB();
myDoubleNumber.ToKMB();
myDecimalNumber.ToKMB();
笔记：
它为更大的数字返回更多细节，我喜欢它。
它也支持负数。（感谢@Dusty 在评论中的注释。
我
decimal在这个例子中写了一个数字方法，你可以写一些覆盖方法来支持它int，long并double在不进行任何转换的情况下使用它，例如：
myIntNumber.ToKMB();
myLongNumber.ToKMB();
myDoubleNumber.ToKMB();
myDecimalNumber.ToKMB();
