当需要对字段的值进行格式化输出时，可以通过设置字段的“格式化字符串”来实现。
参考
http://msdn.microsoft.com/zh-cn/library/fht0f5be(VS.80).aspx
http://msdn.microsoft.com/zh-cn/library/txafckwd(VS.80).aspx
举例
{0} 使用默认格式输出
字符串对齐
| 原值 |
格式化字符串 |
输出 |
| Hello |
->{1,10}<- |
-> Hello<- |
| Hello |
->{1,-10}<- |
->Hello <- |
| abc |
{0}+{0} |
abc+abc |
数字
Basic number formatting specifiers:
| 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 |
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:
日期
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 |