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  • string.format大全

    tring.format大全

    字符串的数字格式

    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

    /////////////////////////////////////////////////////////////////////////////////

    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

    Strings

    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.

    Sample
    Generates

    String.Format("->{1,10}<-", "Hello");
    -> Hello<-

    String.Format("->{1,-10}<-", "Hello");
    ->Hello <-

    Numbers

    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:

    Dates

    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

    Enumerations

    Specifier
    Type

    g
    Default (Flag names if available, otherwise decimal)

    f
    Flags always

    d
    Integer always

    x
    Eight digit hex.

    Some Useful Examples

    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%

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  • 原文地址:https://www.cnblogs.com/elite-2012/p/4838646.html
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