原文发布时间为：2009-08-26 —— 来源于本人的百度文章 [由搬家工具导入]

使用范例：<%#Eval("date","{0:d}") %>

<%# databinder.eval(container.dataitem, "integervalue", "{0:c}") %>
格式化字符串参数是可选的。如果忽略参数，databinder.eval 返回对象类型的值，

//显示二位小数
<%# databinder.eval(container.dataitem, "unitprice", "${0:f2}") %>

//{0:g}代表显示true或false
<itemtemplate>
<asp:image width="12" height="12" border="0" runat="server"
alternatetext='<%# databinder.eval(container.dataitem, "discontinued", "{0:g}") %>'
imageurl='<%# databinder.eval(container.dataitem, "discontinued", "~/images/{0:g}.gif") %>' />
</itemtemplate>
//转换类型
((string)databinder.eval(container, "dataitem.p_ship_time_sbm8")).substring(4,4)
{0:d} 日期只显示年月日
{0:yyyy-mm-dd} 按格式显示年月日
{0:c} 货币样式
<%#container.dataitem("price","{0:￥#,##0.00}")%>
<%# databinder.eval(container.dataitem,"company_ureg_date","{0:yyyy-m-d}")%>
specifier type      format    output (passed double 1.42)   output (passed int -12400)
c   currency         {0:c}      $1.42      -$12,400
d   decimal          {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:d} 日期只显示年月日
{0:yyyy-mm-dd} 按格式显示年月日

样式取决于 web.config 中的设置
{0:c}   或 {0:￡0,000.00} 货币样式   标准英国货币样式
<system.web>
<globalization requestencoding="utf-8" responseencoding="utf-8" culture="en-us" uiculture="en-us" />
</system.web>
显示为 ￡3,000.10

{0:c}   或 string.format("{0:c}", price); 中国货币样式
<system.web>
<globalization requestencoding="utf-8" responseencoding="utf-8" culture="zh-cn" uiculture="zh-cn" />
</system.web>
显示为 ￥3,000.10

{0:c}   或 string.format("{0:c}", price); 美国货币样式
<system.web>
<globalization requestencoding="utf-8" responseencoding="utf-8" />
</system.web>
显示为 $3,000.10

============

stringstr1 =string.Format("{0:N1}",56789);               //result: 56,789.0
stringstr2 =string.Format("{0:N2}",56789);               //result: 56,789.00
stringstr3 =string.Format("{0:N3}",56789);               //result: 56,789.000
stringstr8 =string.Format("{0:F1}",56789);               //result: 56789.0
stringstr9 =string.Format("{0:F2}",56789);               //result: 56789.00
stringstr11 =(56789 / 100.0).ToString("#.##");           //result: 567.89
stringstr12 =(56789 / 100).ToString("#.##");             //result: 567

C 或 c
货币
Console.Write("{0:C}", 2.5); / 2.50
Console.Write("{0:C}", -2.5); //($2.50)

D 或 d
十进制数
Console.Write("{0:D5}", 25); //00025

E 或 e
科学型
Console.Write("{0:E}", 250000); //2.500000E+005

F 或 f
固定点
Console.Write("{0:F2}", 25); //25.00
Console.Write("{0:F0}", 25); //25

G 或 g
常规
Console.Write("{0:G}", 2.5); //2.5

N 或 n
数字
Console.Write("{0:N}", 2500000); //2,500,000.00

X 或 x
十六进制
Console.Write("{0:X}", 250); //FA
Console.Write("{0:X}", 0xffff); //FFFF

字符

说明

示例

输出

There really isn't any formatting within a strong, beyond it's alignment. Alignment works for any argument being printed in a String.Format call.

Basic number formatting specifiers:

Output
(Passed
Double 1.42)

Output
(Passed
Int -12400)

Custom number formatting:

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:

Note that date formatting is especially dependant on the system's regional settings; the example strings here are from my local locale.

The 'U' specifier seems broken; that string certainly isn't sortable.

Custom date formatting:

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

This will output "＄1,240.00" if passed 1243.50. It will output the same format but in parentheses if the number is negative, and will output the string "Zero" if the number is zero.

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

This will output "(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%

再添加一点

Eval的格式，主要看大括号的格式，其他不用那样写