转载-- http://thanksend.blog.163.com/blog/static/5593725720103131641997/
比如说,输出1,2,3...的时候想变成1.0,2.0,3.0
Console.WriteLine("{0:f1}",i);即可。
这里的f表示fixed-point,我理解成小数点后面的位数。f后面的数字就表示要保留几位。上面的命令中如果是f3的话输出就是1.000了。用这种方法,我们可以控制输出数字的格式,但这种方法的原理估计是截断法,不可用来控制有效数字。
同样,我们可以有很多格式化输出的方案,以下内容来自 http://hi.baidu.com/lsj_zz/blog/item/94bc410a2e57d21795ca6bcf.html 对刘士军网友在此深表感谢!
C#格式化数值结果表
| 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 |
| 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 |
| 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 |
最后
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