[C#] ToString() 格式化文字 - 轉載

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Specifier	Type	Example	Output (Passed Double 1500.42)	Note
C	貨幣	2.5.ToString("C")	￥2.50
D	十進位	25.ToString("D5")	25
E	科學符號	25000.ToString("E")	2.50E+05
F	固定點	25.ToString("F2")	25
G	常規	2.5.ToString("G")	2.5
N	數字	2500000.ToString("N")	2,500,000.00
X	十六進位	255.ToString("X")	F
Specifier	Type	Example	Output (Passed Double 1500.42)	Note
0	Zero placeholder	{0:00.0000}	1500.42	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}	1.50E+03	Many exponent formats available.
;	Group separator	see below
Specifier	Type	Example (Passed System.DateTime.Now)
d	Short date	10/12/2002
D	Long date	10-Dec-02
t	Short time	10:11 PM
T	Long time	10:11:29 PM
f	Full date & time	2002/12/10 22:11
F	Full date & time (long)	2002/12/10 22:11
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	10-Dec
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	2002/12/11 03:13
Y	Year month pattern	December, 2002
The 'U' specifier seems broken; that string certainly isn't sortable.
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}	2
yyyy	Year	{0:yyyy}	2002
zz	Timezone offset, 2 digits	{0:zz}	-5
zzz	Full timezone offset	{0:zzz}	-05:00
:	Separator	{0:hh:mm:ss}	10:43:20
/	Separator	{0:dd/MM/yyyy}	10/12/2002
Specifier	Type
g	Default (Flag names if available, otherwise decimal)
f	Flags always
d	Integer always
x	Eight digit hex.

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轉載：https://awei791129.pixnet.net/blog/post/24989287