C#中的String.Format介绍

蔚落 2022-01-05 09:43 223阅读 0赞

关键字：**C\#** **string.format**  
作者：txw1958  
原文：[http://www.cnblogs.com/txw1958/archive/2012/11/15/csharp-string\_format.html][http_www.cnblogs.com_txw1958_archive_2012_11_15_csharp-string_format.html]

** **

**字符串**

<table style="width:520px;border-collapse:collapse;"> 
 <tbody> 
 <tr> 
 <td style="border:solid #C0C0C0 1pt;background:#C0C0C0;"> 示例 </td> 
 <td style="border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 输出 </td> 
 </tr> 
 <tr> 
 <td style="border:solid #C0C0C0 1pt;border-top:none;"> String.Format("-&gt;{1,10}&lt;-", "Hello"); </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> -&gt; Hello&lt;- </td> 
 </tr> 
 <tr> 
 <td style="border:solid #C0C0C0 1pt;border-top:none;"> String.Format("-&gt;{1,-10}&lt;-", "Hello"); </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> -&gt;Hello &lt;- </td> 
 </tr> 
 </tbody> 
</table>

** **

**数字**

基本数字格式示例:

<table style="border-collapse:collapse;"> 
 <tbody> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;background:#C0C0C0;"> 字符 </td> 
 <td style="width:183.65pt;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 类型 </td> 
 <td style="border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 示例 </td> 
 <td style="width:138.4pt;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 输出 (Double 1.42) </td> 
 <td style="width:135pt;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 输出 (Int -12400) </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> c </td> 
 <td style="width:183.65pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Currency 货币 </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:c} </td> 
 <td style="width:138.4pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> ＄1.42 </td> 
 <td style="width:135pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> -＄12,400 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> d </td> 
 <td style="width:183.65pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Decimal (Whole number) 十进制 </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:d} </td> 
 <td style="width:138.4pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> System. FormatException </td> 
 <td style="width:135pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> -12400 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> e </td> 
 <td style="width:183.65pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Scientific 科学记数法 </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:e} </td> 
 <td style="width:138.4pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 1.420000e+000 </td> 
 <td style="width:135pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> -1.240000e+004 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> f </td> 
 <td style="width:183.65pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Fixed point 固定精度 </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:f} </td> 
 <td style="width:138.4pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 1.42 </td> 
 <td style="width:135pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> -12400.00 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> g </td> 
 <td style="width:183.65pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> General 常规 </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:g} </td> 
 <td style="width:138.4pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 1.42 </td> 
 <td style="width:135pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> -12400 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> n </td> 
 <td style="width:183.65pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Number with commas for thousands 用逗号隔开的数字 </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:n} </td> 
 <td style="width:138.4pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 1.42 </td> 
 <td style="width:135pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> -12,400 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> r </td> 
 <td style="width:183.65pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Round trippable 双向转换 </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:r} </td> 
 <td style="width:138.4pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 1.42 </td> 
 <td style="width:135pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> System. FormatException </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> x </td> 
 <td style="width:183.65pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Hexadecimal 十六进制 </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:x4} </td> 
 <td style="width:138.4pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> System. FormatException </td> 
 <td style="width:135pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> cf90 </td> 
 </tr> 
 </tbody> 
</table>

自定义数字格式:

<table style="width:681px;border-collapse:collapse;"> 
 <tbody> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;background:#C0C0C0;"> 字符 </td> 
 <td style="width:121.5pt;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 类型 </td> 
 <td style="width:63pt;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 示例 </td> 
 <td style="width:112.5pt;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 输出 (Double 1500.42) </td> 
 <td style="width:175.5pt;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> Note </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> 0 </td> 
 <td style="width:121.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Zero placeholder 0占位符 </td> 
 <td style="width:63pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:00.0000} </td> 
 <td style="width:112.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 1500.4200 </td> 
 <td style="width:175.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Pads with zeroes.用0填充 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> # </td> 
 <td style="width:121.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Digit placeholder 数字占位符 </td> 
 <td style="width:63pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> { 0:(#).##} </td> 
 <td style="width:112.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> (1500).42 </td> 
 <td style="width:175.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;">&nbsp;</td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> . </td> 
 <td style="width:121.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Decimal point 小数点 </td> 
 <td style="width:63pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:0.0} </td> 
 <td style="width:112.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 1500.4 </td> 
 <td style="width:175.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;">&nbsp;</td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> , </td> 
 <td style="width:121.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Thousand separator千位分隔符 </td> 
 <td style="width:63pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:0,0} </td> 
 <td style="width:112.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 1,500 </td> 
 <td style="width:175.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Must be between two zeroes. </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> ,. </td> 
 <td style="width:121.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Number scaling 数字缩放 </td> 
 <td style="width:63pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:0,.} </td> 
 <td style="width:112.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 2 </td> 
 <td style="width:175.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Comma adjacent to Period scales by 1000. </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> % </td> 
 <td style="width:121.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Percent 百分数 </td> 
 <td style="width:63pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:0%} </td> 
 <td style="width:112.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 150042% </td> 
 <td style="width:175.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Multiplies by 100, adds % sign. </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> e </td> 
 <td style="width:121.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Exponent laceholder指数占位符 </td> 
 <td style="width:63pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:00e+0} </td> 
 <td style="width:112.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 15e+2 </td> 
 <td style="width:175.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Many exponent formats available.许多指数格式可用 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> ; </td> 
 <td style="width:121.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Group separator 群分隔符 </td> 
 <td style="width:63pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> see below 见下 </td> 
 <td style="width:112.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;">&nbsp;</td> 
 <td style="width:175.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> especially useful for formatting currency </td> 
 </tr> 
 </tbody> 
</table>

** **

**日期**** **

<table style="width:675px;border-collapse:collapse;"> 
 <tbody> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;background:#C0C0C0;"> 字符 </td> 
 <td style="width:238.5pt;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 类型 </td> 
 <td style="width:229.5pt;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 示例(System.DateTime.Now) </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> d </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Short date 短日期 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 10/12/2012 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> D </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Long date 长日期 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> December 10, 2012 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> t </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Short time 短时间 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 10:11 PM </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> T </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Long time 长时间 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 10:11:29 PM </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> f </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Full date &amp; time &nbsp; 长日期和短时间 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> December 10, 2012 10:11 PM </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> F </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Full date &amp; time (long) 长日期和长时间 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> December 10, 2012 10:11:29 PM </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> g </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Default date &amp; time &nbsp;短日期和短时间 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 10/12/2012 10:11 PM </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> G </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Default date &amp; time (long) 短日期和长时间 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 10/12/2012 10:11:29 PM </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> M </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Month day pattern 月日模式 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> December 10 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> r </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> RFC1123 date string RFC1123日期字符串 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Tue, 10 Dec 2012 22:11:29 GMT </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> s </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Sortable date string 短日期字符串 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 2012-12-10T22:11:29 </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> u </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Universal sortable, local time 通用，本地时间 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 2012-12-10 22:13:50Z </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> U </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Universal sortable, GMT 通用 GMT </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> December 11, 2012 3:13:50 AM </td> 
 </tr> 
 <tr> 
 <td style="width:38.25pt;border:solid #C0C0C0 1pt;border-top:none;"> Y </td> 
 <td style="width:238.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Year month pattern 年月模式 </td> 
 <td style="width:229.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> December, 2012 </td> 
 </tr> 
 </tbody> 
</table>

自定义日期格式：

<table style="border-collapse:collapse;"> 
 <tbody> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;background:#C0C0C0;"> 字符 </td> 
 <td style="width:171pt;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 类型 </td> 
 <td style="width:2in;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 示例 </td> 
 <td style="width:160.5pt;border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 输出 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> dd </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Day 月中的某一天 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:dd} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 10 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> ddd </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Day name 周中某天的缩写名称 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:ddd} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Tue </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> dddd </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Full day name 周中某天的完整名称 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:dddd} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Tuesday </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> f, ff, ... </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Second fractions 秒的小数精度 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:fff} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 932 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> gg, ... </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Era 时期或纪元 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:gg} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> A.D. </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> hh </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 2 digit hour 12小时制的小时,2位数 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:hh} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 10 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> HH </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 2 digit hour, 24hr format 24 小时制的小时,2位数 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:HH} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 22 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> mm </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Minute 00-59 分钟,2位数 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:mm} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 38 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> MM </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Month 01-12 月份数字,2位数 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:MM} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 12 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> MMM </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Month abbreviation 月份的缩写名称 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:MMM} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Dec </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> MMMM </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Full month name 月份的完整名称 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:MMMM} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> December </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> ss </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Seconds 00-59 秒,2位数 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:ss} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 46 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> tt </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> AM or PM AM/PM 指示项 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:tt} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> PM </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> yy </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Year, 2 digits 不包含纪元的年份 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:yy} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 02 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> yyyy </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Year 包括纪元的四位数的年份 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:yyyy} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 2012 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> zz </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Timezone offset, 2 digits 时区偏移量,2位数 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:zz} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> -05 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> zzz </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Full timezone offset 完整时区偏移量 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:zzz} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> -05:00 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> : </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Separator 默认时间分隔符 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:hh:mm:ss} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 10:43:20 </td> 
 </tr> 
 <tr> 
 <td style="width:65.25pt;border:solid #C0C0C0 1pt;border-top:none;"> / </td> 
 <td style="width:171pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Separator 默认日期分隔符 </td> 
 <td style="width:2in;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> {0:dd/MM/yyyy} </td> 
 <td style="width:160.5pt;border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> 10/12/2012 </td> 
 </tr> 
 </tbody> 
</table>

** **

**枚举**

<table style="border-collapse:collapse;"> 
 <tbody> 
 <tr> 
 <td style="border:solid #C0C0C0 1pt;background:#C0C0C0;"> 字符 </td> 
 <td style="border:solid #C0C0C0 1pt;border-left:none;background:#C0C0C0;"> 类型 </td> 
 </tr> 
 <tr> 
 <td style="border:solid #C0C0C0 1pt;border-top:none;"> g </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Default (Flag names if available, otherwise decimal) </td> 
 </tr> 
 <tr> 
 <td style="border:solid #C0C0C0 1pt;border-top:none;"> f </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Flags always </td> 
 </tr> 
 <tr> 
 <td style="border:solid #C0C0C0 1pt;border-top:none;"> d </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Integer always </td> 
 </tr> 
 <tr> 
 <td style="border:solid #C0C0C0 1pt;border-top:none;"> x </td> 
 <td style="border-top:none;border-left:none;border-bottom:solid #C0C0C0 1pt;border-right:solid #C0C0C0 1pt;"> Eight digit hex. </td> 
 </tr> 
 </tbody> 
</table>

** **

**其他**

String.Format("\{0:＄\#,\#\#0.00;(＄\#,\#\#0.00);Zero\}", value);

负数的时候输出括号，0的时候输出Zero

String.Format("\{0:$\#,\#\#0.00;($\#,\#\#0.00);Zero\}", 12345.00)

将输出$12,345.00

String.Format("\{0:$\#,\#\#0.00;($\#,\#\#0.00);Zero\}", -12345.00)

将输出($12,345.00)

String.Format("\{0:$\#,\#\#0.00;($\#,\#\#0.00);Zero\}", 0.00)

输出zero

String.Format("\{0:(\#\#\#) \#\#\#-\#\#\#\#\}", 18005551212)

输出(1800) 555-1212

* *

转载于:https://www.cnblogs.com/lanzhi/p/6468091.html

[http_www.cnblogs.com_txw1958_archive_2012_11_15_csharp-string_format.html]: http://www.cnblogs.com/txw1958/archive/2012/11/15/csharp-string_format.html