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.

 

下表是从网上得来:

 

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

 

 

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

 

 

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

 

 

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

 

            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 11:43

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

 

            Console.WriteLine("{0 :g}"System.DateTime.Now);    // 2012-3-27 11:43

            Console.WriteLine("{0 :G}"System.DateTime.Now);    // 2012-3-27 11:43:34

 

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

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

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

            Console.WriteLine("{0 :u}"System.DateTime.Now);    // 2012-03-27 11:43:34Z

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

            Console.WriteLine("{0 :Y}"System.DateTime.Now);    // 20123

 

            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 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);  // 114334

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

        

 

 

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