C# Console.WriteLine()函数中{}输出格式详解

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格式项都采用如下形式:

{index[,alignment][:formatString]}   

 

其中"index"指索引占位符,这个肯定都知道;

",alignment"按字面意思显然是对齐方式,","为标记;

":formatString"就是对输出格式的限定,以":"为标记。

 

alignment:可选,是一个带符号的整数,指示首选的格式化字段宽度。如果对齐值小于格式化字符串的长度,对齐会被忽略,并且使用格式化字符串的长度作为字段宽度。如果对齐为正数,字段的格式化数据为右对齐;如果对齐为负数,字段的格式化数据为左对齐。如果需要填充,则使用空白。如果指定对齐,就需要使用逗号。

 

formatString:由标准或自定义格式说明符组成.

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

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 forthousands

{0:n}

1.42

-12,400

r

Round trippable

{0:r}

1.42

System.
FormatException

x

Hexadecimal

{0:x4}

System.
FormatException

cf90

 

 

Specifier

Type

Example (PassedSystem.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 10:11:29PM

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 22:11:29GMT

s

Sortable date string

2002-12-10T22:11:29

u

Universal sortable, localtime

2002-12-10 22:13:50Z

U

Universal sortable, GMT

December 11, 2002 3:13:50AM

Y

Year month pattern

December, 2002

 

 

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


示例:

// Console.WriteLine中各种数据格式的输出

           Console.WriteLine("{0, 8 :C}",2);    //$2.00

           Console.WriteLine("{0, 8 :C3}",2);   // $2.000

           Console.WriteLine("{0 :D3}",2);      // 002

           Console.WriteLine("{0 :E}",2);       // 2.000000E+000

           Console.WriteLine("{0 :G}",2);       // 2

           Console.WriteLine("{0 :N}",2500000.00);   // 2,500,00.00

           Console.WriteLine("{0 :x4}",12);     //000c

           Console.WriteLine("{0, 2 :x}",12);   // c

           Console.WriteLine("{0 :000.000}",12.23);   //012.230

           Console.WriteLine("{0 :r}",15.62);   // 15.62

           Console.WriteLine("{0 :d}", System.DateTime.Now);   //2012-3-27

           Console.WriteLine("{0 :D}", System.DateTime.Now);   //2012年3月27日

 

           Console.WriteLine("{0 :t}", System.DateTime.Now);   // 11:43

           Console.WriteLine("{0 :T}", System.DateTime.Now);   // 11:43:34

 

           Console.WriteLine("{0 :f}", System.DateTime.Now);   // 2012年3月27日11:43

           Console.WriteLine("{0 :F}", System.DateTime.Now);   // 2012年3月27日11:43:34

 

           Console.WriteLine("{0 :g}", System.DateTime.Now);   //2012-3-2711:43

           Console.WriteLine("{0 :G}", System.DateTime.Now);   //2012-3-2711:43:34

 

           Console.WriteLine("{0 :M}", System.DateTime.Now);   //3月27日

           Console.WriteLine("{0 :r}", System.DateTime.Now);// Tue, 27 Mar 2012 11:43:34GMT

           Console.WriteLine("{0 :s}", System.DateTime.Now);   //2012-03-27T11:43:34

           Console.WriteLine("{0 :u}", System.DateTime.Now);   //2012-03-2711:43:34Z

           Console.WriteLine("{0 :U}", System.DateTime.Now);   // 2012年3月27日3:43:34

           Console.WriteLine("{0 :Y}", System.DateTime.Now);   // 2012年3月

 

           Console.WriteLine("{0 :dd}",System.DateTime.Now);   //27

           Console.WriteLine("{0 :ddd}",System.DateTime.Now); //

           Console.WriteLine("{0 :dddd}",System.DateTime.Now); //星期二

 

           Console.WriteLine("{0 :f}", System.DateTime.Now);   // 2012年3月27日11:46

           Console.WriteLine("{0 :ff}",System.DateTime.Now);   //18

           Console.WriteLine("{0 :fff}",System.DateTime.Now);  //187

           Console.WriteLine("{0 :ffff}",System.DateTime.Now); // 1875

           Console.WriteLine("{0 :fffff}",System.DateTime.Now); // 18750

 

           Console.WriteLine("{0 :gg}",System.DateTime.Now);  //公元

           Console.WriteLine("{0 :ggg}",System.DateTime.Now); //公元

           Console.WriteLine("{0 :gggg}",System.DateTime.Now);// 公元

           Console.WriteLine("{0 :ggggg}",System.DateTime.Now);    //公元

           Console.WriteLine("{0 :gggggg}",System.DateTime.Now);   //公元

 

           Console.WriteLine("{0 :hh}",System.DateTime.Now);   //11

           Console.WriteLine("{0 :HH}",System.DateTime.Now);   //11

 

           Console.WriteLine("{0 :mm}",System.DateTime.Now);   //50

           Console.WriteLine("{0 :MM}",System.DateTime.Now);   //03

 

           Console.WriteLine("{0 :MMM}",System.DateTime.Now); //三月

           Console.WriteLine("{0:MMMM}",System.DateTime.Now); //三月

 

           Console.WriteLine("{0 :ss}",System.DateTime.Now);   //43

           Console.WriteLine("{0 :tt}",System.DateTime.Now);  //上午

 

           Console.WriteLine("{0 :yy}",System.DateTime.Now);   //12

           Console.WriteLine("{0 :yyyy}",System.DateTime.Now); // 2012

           Console.WriteLine("{0 :zz}",System.DateTime.Now);   //+08

           Console.WriteLine("{0 :zzz}",System.DateTime.Now);  //+08:00

           Console.WriteLine("{0 :hh:mm:ss}",System.DateTime.Now);  //11:43:34

           Console.WriteLine("{0 :dd/MM/yyyy}",System.DateTime.Now); //27-03-2012


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