ToString，
ToString，
字符型转换为字符串
// C 货币
2.5.ToString("C"); // ￥2.50
// D 10进制数
25.ToString("D5"); // 25000
// E 科学型
25000.ToString("E"); // 2.500000E+005
// F 固定点
25.ToString("F2"); // 25.00 "F?"表示保持几位小数
// G 常规
2.5.ToString("G"); // 2.5
// N 数字
2500000.ToString("N"); // 2,500,000.00
// X 16进制
255.ToString("X"); // FF
// C# 日期格式
DateTime dt = DateTime.Now;
dt.ToString();//2005-11-5 13:21:25
dt.ToFileTime().ToString();//127756416859912816
dt.ToFileTimeUtc().ToString();//127756704859912816
dt.ToLocalTime().ToString();//2005-11-5 21:21:25
dt.ToLongDateString().ToString();//2005年11月5日
dt.ToLongTimeString().ToString();//13:21:25
dt.ToOADate().ToString();//38661.5565508218
dt.ToShortDateString().ToString();//2005-11-5
dt.ToShortTimeString().ToString();//13:21
dt.ToUniversalTime().ToString();//2005-11-5 5:21:25
dt.Year.ToString();//2005
dt.Date.ToString();//2005-11-5 0:00:00
dt.DayOfWeek.ToString();//Saturday
dt.DayOfYear.ToString();//309
dt.Hour.ToString();//13
dt.Millisecond.ToString();//441
dt.Minute.ToString();//30
dt.Month.ToString();//11
dt.Second.ToString();//28
dt.Ticks.ToString();//632667942284412864
将123456789转成123,456,789
System.Convert.ToDouble("12354465").ToString("c")
日期:2008-12-01 12:01:01.300
System.Convert.ToDouble("12354465").ToString("yy-MM-dd
hh-mm-ss.")
|
格式说明符 |
说明 |
示例 |
输出 |
|
C |
货币 |
2.5.ToString("C") |
￥2.50 |
|
D |
十进制数 |
25.ToString("D5") |
00025 |
|
E |
科学型 |
25000.ToString("E") |
2.500000E+005 |
|
F |
固定点 |
25.ToString("F2") |
25.00 |
|
G |
常规 |
2.5.ToString("G") |
2.5 |
|
N |
数字 |
2500000.ToString("N") |
2,500,000.00 |
|
X |
十六进制 |
255.ToString("X") |
FF |
|
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 |
|
Sample |
Generates |
|
String.Format("->{1,10}<-", "Hello"); |
-> Hello<- |
|
String.Format("->{1,-10}<-", "Hello"); |
->Hello <- |
|
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 |
|
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 |
|
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 |
Enumerations
|
Specifier |
Type |
|
g |
Default (Flag names if available, otherwise decimal) |
|
f |
Flags always |
|
d |
Integer always |
|
x |
Eight digit hex. |
String.Format("{0:＄#,##0.00;(＄#,##0.00);Zero}",
value);
//"
＄1,240.00" if passed
1243.50. 0与#区别是0输出非负数 (否则为0),#则为数字
String.Format("{0:(###) ###-####}",
18005551212);
// "(800) 555-1212"
变量.ToString() 字符型转换 转为字符串
12345.ToString("n"); //生成 12,345.00
12345.ToString("C"); //
生成 ￥12,345.00
12345.ToString("e"); //
生成
1.234500e+004
12345.ToString("f4"); //
生成 12345.0000
12345.ToString("x"); //
生成 3039 (16进制)
12345.ToString("p"); //
生成
1,234,500.00%
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