一聚教程网:一个值得你收藏的教程网站

热门教程

C#中的String.Format的格式参数详解

时间:2022-06-25 08:15:51 编辑:袖梨 来源:一聚教程网

一、定义
String.Format是将指定的 String类型的数据中的每个格式项替换为相应对象的值的文本等效项。
如:

(1)

 代码如下 复制代码
string p1 = "Jackie";
string p2 = "Aillo";
Response.Write(String.Format("Hello {0}, I'm {1}", p1, p2));

(2)

 代码如下 复制代码
Response.Write(String.Format("Hello {0}, I'm {1}", "Jackie", "Aillo"));

这二者的效果是一样的。都是将最后面的两项的值分别替换第一项的{0}和{1}。
输出的结果是:Hello Jackie, I'm Aillo

(3)

 代码如下 复制代码

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%


二、String.Format的多格式定义:
      这里所谓的多格式是指一个格式项中可以定义1~3个格式参数,每种格式参数用分号(;)隔开。带2个和3个格式参数的格式项所对应的值必须是数值类型的,这样才能判断是否为负数、正数、零。
带1个格式参数:

 代码如下 复制代码

//以科学计数法的格式输出
double p1 = 1000000;
Response.Write(String.Format("{0:E2}", p1));

带2个格式参数:

/*当格式项对应的值为非负数,则选择第一种格式;值为负数则选第二种格式*/

 代码如下 复制代码
double p1 = 10000;
double p2 = -2420.50;
Response.Write(String.Format("{0:#,###0.00;#,###0.000;}
", p1));
Response.Write(String.Format("{0:#,###0.00;#,###0.000;}", p2));

带3个格式参数:

/*当格式项对应的值为正数则选择第一张格式;
负数则为第二中格式;
值等于零则为第三种格式*/

 代码如下 复制代码
1double p1 = 10000;
double p2 = -2420.50;
double p3 = 0.00;
Response.Write(String.Format("{0:#,###0.00;#,###0.000;#,###0.0000}
", p1));
Response.Write(String.Format("{0:#,###0.00;#,###0.000;#,###0.0000}
", p3));
Response.Write(String.Format("{0:#,###0.00;#,###0.000;#,###0.0000}", p2));

补充:

{0:N2} 中的N3,f3表示格式化之后数据的类型以及小数的位数。如:N2表示带2个小数的数字;
与此类似:

N或者n  表示  数字
F或者f   表示  固定点
E或者e  表示  科学计数法
D或者d  表示  十进制数
X或者x  表示  十六进制
G或者g  表示  常规
C或者c  表示  货币

String.Format的格式

C#格式化数值结果表

pse: collapse; height: 203px" border="1" cellspacing="0" cellpadding="3">

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.

热门栏目