手邊有一張速查表(Cheat Sheets)是件很方便的事
於是我去找了 String.Format For .Net 的速查表，整理了一下
Strings
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Sample
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Generates
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String.Format(“->{1,10}<-”, “Hello”);
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-> Hello<-
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String.Format(“->{1,-10}<-”, “Hello”);
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->Hello <-
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Numbers
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Specifier
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Type
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Format
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Output (Passed Double 1.42)
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Output (Passed Int -12400)
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c
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Currency
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{0:c}
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$1.42
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-$12,400
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d
|
Decimal (Whole number)
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{0:d}
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System.FormatException
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-12400
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e
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Scientific
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{0:e}
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1.420000e+000
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-1.240000e+004
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f
|
Fixed point
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{0:f}
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1.42
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-12400.00
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g
|
General
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{0:g}
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1.42
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-12400
|
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n
|
Number with commas for thousands
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{0:n}
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1.42
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-12,400
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r
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Round trippable
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{0:r}
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1.42
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System.FormatException
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x
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Hexadecimal
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{0:x4}
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System.FormatException
|
cf90
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Custom
number formatting:
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Specifier
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Type
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Example
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Output (Passed Double 1500.42)
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Note
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0
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Zero placeholder
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{0:00.0000}
|
1500.4200
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Pads with zeroes.
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#
|
Digit placeholder
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{0:(#).##}
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(1500).42
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|
|
.
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Decimal point
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{0:0.0}
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1500.4
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,
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Thousand separator
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{0:0,0}
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1,500
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Must be between two zeroes.
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,.
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Number scaling
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{0:0,.}
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2
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Comma adjacent to Period scales by 1000.
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%
|
Percent
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{0:0%}
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150042%
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Multiplies by 100, adds % sign.
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e
|
Exponent placeholder
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{0:00e+0}
|
15e+2
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Many exponent formats available.
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;
|
Group separator
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see below
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Enumerations
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Specifier
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Type
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g
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Default (Flag names if available, otherwise
decimal)
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f
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Flags always
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d
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Integer always
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x
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Eight digit hex.
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Some Useful Examples
String.Format(“{0:$#,##0.00;($#,##0.00);Zero}”, value);
Input: 1243.50 Output:$1,240.00
Input: -1243.50 Output:Zero
String.Format(“{0:(###) ###-####}”, 8005551212);
This
will output “(800) 555-1212″.
Dates
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Specifier
|
Type
|
Example (Passed System.DateTime.Now)
|
|
d
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Short date
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10/12/2002
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D
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Long date
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December 10, 2002
|
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t
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Short time
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10:11 PM
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T
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Long time
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10:11:29 PM
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f
|
Full date & time
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December 10, 2002 10:11 PM
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F
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Full date & time (long)
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December 10, 2002 10:11:29 PM
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g
|
Default date & time
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10/12/2002 10:11 PM
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G
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Default date & time (long)
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10/12/2002 10:11:29 PM
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M
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Month day pattern
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December 10
|
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r
|
RFC1123 date string
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Tue, 10 Dec 2002 22:11:29 GMT
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|
s
|
Sortable date string
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2002-12-10T22:11:29
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u
|
Universal sortable, local time
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2002-12-10 22:13:50Z
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U
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Universal sortable, GMT
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December 11, 2002 3:13:50 AM
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Y
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Year month pattern
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December, 2002
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Custom date formatting:
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Specifier
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Type
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Example
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Example Output
|
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dd
|
Day
|
{0:dd}
|
10
|
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ddd
|
Day name
|
{0:ddd}
|
Tue
|
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dddd
|
Full day name
|
{0:dddd}
|
Tuesday
|
|
f, ff, …
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Second fractions
|
{0:fff}
|
932
|
|
gg, …
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Era
|
{0:gg}
|
A.D.
|
|
hh
|
2 digit hour
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{0:hh}
|
10
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HH
|
2 digit hour, 24hr format
|
{0:HH}
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22
|
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mm
|
Minute 00-59
|
{0:mm}
|
38
|
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MM
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Month 01-12
|
{0:MM}
|
12
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MMM
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Month abbreviation
|
{0:MMM}
|
Dec
|
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MMMM
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Full month name
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{0:MMMM}
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December
|
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ss
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Seconds 00-59
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{0:ss}
|
46
|
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tt
|
AM or PM
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{0:tt}
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PM
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yy
|
Year, 2 digits
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{0:yy}
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02
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yyyy
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Year
|
{0:yyyy}
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2002
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zz
|
Timezone offset, 2 digits
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{0:zz}
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-05
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zzz
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Full timezone offset
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{0:zzz}
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-05:00
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:
|
Separator
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{0:hh:mm:ss}
|
10:43:20
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/
|
Separator
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{0:dd/MM/yyyy}
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10/12/2002
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這樣清楚多了，以後查詢起來也快了一些，大大提升工作效率。
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