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C#格式化数值结果表（格式化字符串）2011-04-14

字符	说明	示例	输出
C	货币	string.Format（"{0:C3}", 2）	$2.000
D	十进制	string.Format（"{0:D3}", 2）	002
E	科学计数法	1.20E+001	1.20E+001
G	常规	string.Format（"{0:G}", 2）	2
N	用分号隔开的数字	string.Format（"{0:N}", 250000）	250,000.00
X	十六进制	string.Format（"{0:X000}", 12）	C
		string.Format（"{0:000.000}", 12.2）	012.200

Strings

There really isn"t any formatting within a strong, beyond it"s alignment. Alignment works for any argument being printed in a String.Format call.

Sample	Generates
String.Format（"->{1,10}<-", "Hello"）;	-> Hello<-
String.Format（"->{1,-10}<-", "Hello"）;	->Hello <-

Numbers

Basic number formatting specifiers:

Specifier	Type	Format	Output （Passed Double 1.42）	Output （Passed Int -12400）
c	Currency	{0:c}	$1.42	-$12,400
d	Decimal （Whole number）	{0:d}	system. FormatException	-12400
e	Scientific	{0:e}	1.420000e+000	-1.240000e+004
f	Fixed point	{0:f}	1.42	-12400.00
g	General	{0:g}	1.42	-12400
n	Number with commas for thousands	{0:n}	1.42	-12,400
r	Round trippable	{0:r}	1.42	system. FormatException
x	Hexadecimal	{0:x4}	system. FormatException	cf90

Custom number formatting:

Specifier	Type	Example	Output （Passed Double 1500.42）	Note
0	Zero placeholder	{0:00.0000}	1500.4200	Pads with zeroes.
#	Digit placeholder	{0:（#）.##}	（1500）.42
.	Decimal point	{0:0.0}	1500.4
,	Thousand separator	{0:0,0}	1,500	Must be between two zeroes.
,.	Number scaling	{0:0,.}	2	Comma adjacent to Period scales by 1000.
%	Percent	{0:0%}	150042%	Multiplies by 100, adds % sign.
e	Exponent placeholder	{0:00e+0}	15e+2	Many exponent formats available.
;	Group separator	see below