N 或 n 数字 数字转换为“-d,ddd,ddd.ddd…”形式的字符串，其中“-”表示负数符号（如果需要），“d”表示数字 (0-9)，“,”表示数字组之间的千位分隔符，“.”表示小数点符号。实际的负数模式、数字组大小、千位分隔符以及十进制分隔符由当前 NumberFormatInfo 对象指定。
K 表示 DateTime.Kind 属性的不同值，即“Local”、“Utc”或“Unspecified”。此说明符以文本形式循环设置 Kind 值并保留时区。如果 Kind 值为“Local”，则此说明符等效于“zzz”说明符，用于显示本地时间偏移量，例如“-07:00”。对于“Utc”类型值，该说明符显示字符“Z”以表示 UTC 日期。对于“Unspecified”类型值，该说明符等效于“”（无任何内容）。
m 将分钟表示为从 0 至 59 的数字。分钟表示自前一小时后经过的整分钟数。一位数字的分钟数设置为不带前导零的格式。有关使用单个格式说明符的更多信息，请参见使用单个自定义格式说明符。
mm, mm（另加任意数量的“m”说明符） 将分钟表示为从 00 至 59 的数字。分钟表示自前一小时后经过的整分钟数。一位数字的分钟数设置为带前导零的格式。
M 将月份表示为从 1 至 12 的数字。一位数字的月份设置为不带前导零的格式。有关使用单个格式说明符的更多信息，请参见使用单个自定义格式说明符。
格式字符串 结果 G 或 g 如有可能，将枚举项显示为字符串值，否则显示当前实例的整数值。如果枚举定义中设置了 Flags 属性，则串联每个有效项的字符串值并将各值用逗号分开。如果未设置 Flags 属性，则将无效值显示为数字项。
F 或 f 如有可能，将枚举项显示为字符串值。如果值可以完全显示为枚举项的总和（即使未提供 Flags 属性），则串联每个有效项的字符串值并将各值用逗号分开。如果值不能完全由枚举项确定，则将值格式化为整数值。
D 或 d 以尽可能短的表示形式将枚举项显示为整数值。
X 或 x 将枚举项显示为十六进制值。按需要将值表示为带有前导零，以确保值的长度最少有八位
用法：
String.Format就是和""一样指定一个字符串
区别String.Format允许占位符
如
int X=1;
string a="今天是第"+X+"天";
string a=String.Format("今天是第{0}天",X);
这个格式是直接复制粘贴的。。。。。
C#格式化数值结果表
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
The group separator is especially useful for formatting currency values which require that negative values be enclosed in parentheses. This currency formatting example at the bottom of this document makes it obvious:
Dates
Note that date formatting is especially dependant on the system's regional settings; the example strings here are from my local locale.
Specifier
Type
Example (Passed System.DateTime.Now)
d
Short date
10/12/2002
D
Long date
December 10, 2002
t
Short time
10:11 PM
T
Long time
10:11:29 PM
f
Full date & time
December 10, 2002 10:11 PM
F
Full date & time (long)
December 10, 2002 10:11:29 PM
g
Default date & time
10/12/2002 10:11 PM
G
Default date & time (long)
10/12/2002 10:11:29 PM
M
Month day pattern
December 10
r
RFC1123 date string
Tue, 10 Dec 2002 22:11:29 GMT
s
Sortable date string
2002-12-10T22:11:29
u
Universal sortable, local time
2002-12-10 22:13:50Z
U
Universal sortable, GMT
December 11, 2002 3:13:50 AM
Y
Year month pattern
December, 2002
The 'U' specifier seems broken; that string certainly isn't sortable.
Custom date formatting:
Specifier
Type
Example
Example Output
dd
Day
{0:dd}
10
ddd
Day name
{0:ddd}
Tue
dddd
Full day name
{0:dddd}
Tuesday
f, ff, ...
Second fractions
{0:fff}
932
gg, ...
Era
{0:gg}
A.D.
hh
2 digit hour
{0:hh}
10
HH
2 digit hour, 24hr format
{0:HH}
22
mm
Minute 00-59
{0:mm}
38
MM
Month 01-12
{0:MM}
12
MMM
Month abbreviation
{0:MMM}
Dec
MMMM
Full month name
{0:MMMM}
December
ss
Seconds 00-59
{0:ss}
46
tt
AM or PM
{0:tt}
PM
yy
Year, 2 digits
{0:yy}
02
yyyy
Year
{0:yyyy}
2002
zz
Timezone offset, 2 digits
{0:zz}
-05
zzz
Full timezone offset
{0:zzz}
-05:00
:
Separator
{0:hh:mm:ss}
10:43:20
/
Separator
{0:dd/MM/yyyy}
10/12/2002
Enumerations
Specifier
Type
g
Default (Flag names if available, otherwise decimal)
This will output "＄1,240.00" if passed 1243.50. It will output the same format but in parentheses if the number is negative, and will output the string "Zero" if the number is zero.
using System;
using System.Globalization;
using System.Text;
public sealed class App
{
static void Main()
{
StringBuilder sb = new StringBuilder();
// Loop through all the specific cultures known to the CLR.
foreach (CultureInfo ci in CultureInfo.GetCultures(CultureTypes.SpecificCultures))
{
// Only show the currency symbols for cultures that speak English.
if (ci.TwoLetterISOLanguageName != "en") continue;
// Display the culture name and currency symbol.
NumberFormatInfo nfi = ci.NumberFormat;
sb.AppendFormat("The currency symbol for '{0}' is '{1}'",
ci.DisplayName, nfi.CurrencySymbol);
sb.AppendLine();
}
Console.WriteLine(sb.ToString());
}
}
// This code produces the following output.
//
// The currency symbol for 'English (United States)' is '$'
// The currency symbol for 'English (United Kingdom)' is ''
// The currency symbol for 'English (Australia)' is '$'
// The currency symbol for 'English (Canada)' is '$'
// The currency symbol for 'English (New Zealand)' is '$'
// The currency symbol for 'English (Ireland)' is '?'
// The currency symbol for 'English (South Africa)' is 'R'
// The currency symbol for 'English (Jamaica)' is 'J$'
// The currency symbol for 'English (Caribbean)' is '$'
// The currency symbol for 'English (Belize)' is 'BZ$'
// The currency symbol for 'English (Trinidad and Tobago)' is 'TT$'
// The currency symbol for 'English (Zimbabwe)' is 'Z$'
// The currency symbol for 'English (Republic of the Philippines)' is 'Php'
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