望穿秋水
管理&技术&业务 项目管理方面:加强通过工具辅助管理,构建Web项目管理系统来协助项目管理。技术开发方面:加强系统分析能力、架构设计能力,时刻把握新技术动态。业务方面:加强需求分析能力,使最终需求来源于客户又高于客户。

1.         y代表年份,注意是小写的y,大写的Y并不代表年份。

2.         M表示月份。

3.         d表示日期,注意D并不代表什么。

4.         hH表示小时,h用的是12小时制,H用的是24小时制。

5.         m表示分钟。

6.         s表示秒。注意S并不代表什么。

格式

输出

示例

y

7

string yy = DateTime.Now.ToString("y-MM")

yy="7-05"

yy

07

string yy = DateTime.Now.ToString("yy-MM")

yy="07-05"

yyy或更多的y

1984

string yy = DateTime.Now.ToString("yyyy");

yy="2007"

M

5.

string mon = DateTime.Parse("1984-05-09")ToString("yyyy-M")

mon = "1984-5"

MM

05.

string mon = DateTime.Parse("1984-05-09")ToString("M")

mon = "05"

MMM

如果是中文版的操作系统,则会输出:五月.

如果是英文操作系统,则输入月份前三个字母的简写:May

string mon = DateTime.Parse("2006-07-01").ToString("MMM")

英文版操作系统:Jul

中文版操作系统:七月

MMMM或更多的M

如果是中文版的操作系统,则会输出:五月.

如果是英文操作系统,则输入月份的全写

string mon = DateTime.Parse("2006-07-01").ToString("MMM")

英文版操作系统:July

中文版操作系统:七月

日期或星期

d

9

string dd= DateTime.Parse("1984-05-09")ToString("d")

dd= "9"

dd

09

string dd= DateTime.Parse("1984-05-09")ToString("dd")

dd= "09"

ddd

如果是中文版的操作系统,则会输出星期,如星期三。.

如果是英文操作系统,则输出星期的简写:如

Wed

string dd = DateTime.Parse("2006-07-01").ToString("ddd")

英文版操作系统:Wed

中文版操作系统:星期三

dddd或更多的d

如果是中文版的操作系统,则会输出星期,如星期三。.

如果是英文操作系统,则输出星期:如

Wednesday

string dd = DateTime.Parse("2006-07-01").ToString("dddd")

英文版操作系统:Wednesday

中文版操作系统:星期三

小时

h

小时范围:1-12

string hh = DateTime.Now.ToString(“h”);

hh = 8

hh或更多的h

小时范围:1-12

string hh = DateTime.Now.ToString(“hh”);

hh = 08

H

小时范围:0-23

string hh = DateTime.Now.ToString(“yyyy-H”);

hh = 2006-8

HH或更多的H

小时范围:0-23

string hh = DateTime.Now.ToString(“yyyy-HH”);

hh = 2006-08

string hh = DateTime.Pare(“2006-7-4 18:00:00”).ToString(“yyyy-HH”);

hh = 2006-18

分钟

m

6

string mm =  DateTime.Now.ToString("yyyy-MM-dd-m");

mm = “2006-07-01-6”;

mm或更多的m

06

string mm =  DateTime.Now.ToString("yyyy-MM-dd-mm");

mm = “2006-07-01-06”;

s

6

string mm =  DateTime.Now.ToString("yyyy-MM-dd-s");

mm = “2006-07-01-6”;

ss或更多的s

06

string mm =  DateTime.Now.ToString("yyyy-MM-dd-ss");

mm = “2006-07-01-06”;














































































 

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)
f Flags always
d Integer always
x Eight digit hex.

Some Useful Examples

String.Format("{0:$#,##0.00;($#,##0.00);Zero}", value);

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.

String.Format("{0:(###) ###-####}", 18005551212);

This will output "(800) 555-1212".

 

变量.ToString()


字符型转换 转为字符串
12345.ToString("n"); //生成 12,345.00
12345.ToString("C"); //生成 ¥12,345.00
12345.ToString("e"); //生成 1.234500e+004
12345.ToString("f4"); //生成 12345.0000
12345.ToString("x"); //生成 3039 (16进制)
12345.ToString("p"); //生成 1,234,500.00%

posted on 2008-01-07 20:09  望穿秋水  阅读(798)  评论(1编辑  收藏  举报