Summary of common ToString of methods in c
- 2020-05-07 20:19:26
- OfStack
C
currency
2.5.ToString("C")
RMB 2.50
D
Decimal number
25.ToString("D5")
00025
E
science-based
25000.ToString("E")
2.500000E+005
F
Fixed point
25.ToString("F2")
25.00
G
conventional
2.5.ToString("G")
2.5
N
digital
2500000.ToString("N")
2,500,000.00
X
106 into the system
255.ToString("X")
FF
Format character
Should use
Contain righteousness
In cases
C
Numeric types
Currency value for a special occasion
$4834.50 (USA)
£4834.50 (UK)
D
Only for integer types
Integer like 1
4834
E
Numeric types
Scientific enumeration
4.834E+003
F
Numeric types
The number of digits after the decimal point is fixed
4384.50
G
Numeric types
Number like 1
4384.5
N
Numeric types
Usually a number format for special occasions
4,384.50 (UK/USA)
4 384,50 (continental Europe)
P
Numeric types
Percentage counting
432,000.00%
X
Only for integer types
Hexadecimal format
1120 (if you want to display 0x1120, you need to write 0x)
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".
Variables. ToString ()
Character conversion to a string
12345. ToString (" n "); / / generated 12345.00
12345. ToString (" C "); // generate ¥12,345.00
12345. ToString (" e "); / / generated 1.234500 e + 004
12345. ToString (" f4 "); / / generated 12345.0000
12345. ToString (" x "); // generate 3039 (hexadecimal)
12345. ToString (" p "); / / generated 1234500.00%