A summary of the common ToString () method in C # _c# tutorial

For ToString such as int,double:

C	Currency	2.5.ToString ("C")	￥2.50
D	Decimal number	25.ToString ("D5")	00025
E	Scientific type	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	Hexadecimal	255.ToString ("X")	Ff

Format character	Should be used	Contain righteousness	Sample
C	Number Type	Currency value for special occasions	$4834.50 (USA) £4834.50 (UK)
D	For integer types only	A general integer	4834
E	Number Type	Scientific counting method	4.834E+003
F	Number Type	Fixed number of digits after decimal point	4384.50
G	Number Type	A General number	4384.5
N	Number Type	Usually a digital format for a special occasion	4,384.50 (Uk/usa) 4 384,50 ( European continent)
P	Number Type	Percent Count method	432,000.00%
X	For integer types only	format in	1120 ( 0x should be written if you want to displaythe 0x1120)

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%}	150,042%	Multiplies by, adds% sign.
E	Exponent placeholder	{0:00e+0}	15e+2	Many exponent formats available.
;	Group Separator	Below

The group separator is especially useful for formatting currency values which require that negative values are enclosed in Parentheses. This currency formatting example in the bottom of this document makes it obvious:

Dates

Note This date formatting is especially dependant on the system ' s regional settings; The example strings here is 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, 2002 10:11 PM
F	Full Date & Time (Long)	December, 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, 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, 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:$#,# #0;" ($#,# #0.00); Zero} ", value);

This would output "$1,240.00" if passed 1243.50. It would output the same format but in parentheses if the # is negative, and would output the string "Zero" if the numb ER is zero.
String.Format ("{0: (###) ###-####}", 18005551212);

This would output "(800) 555-1212".

Variable. ToString ()

character conversion to string
12345.ToString ("n");//Generate 12,345.00
12345.ToString ("C");//Build ￥12,345.00
12345.ToString ("E"); Generate 1.234500e+004
12345.ToString ("F4");//Generate 12345.0000
12345.ToString ("x");//Generate 3039 (16 binary)
12345. ToString ("P"); Generate 1,234,500.00%