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Standard Numeric Format Strings

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The following table describes the standard numeric format specifiers and displays sample output produced by each format specifier. See the Notes section for additional information about using standard numeric format strings, and the Example section for a comprehensive illustration of their use.

 

Format specifier

Name

Description

Examples

"C" or "c"

Currency

Result: A currency value.

Supported by: All numeric types.

Precision specifier: Number of decimal digits.

Default precision specifier: Defined byNumberFormatInfo.CurrencyDecimalDigits.

More information: The Currency ("C") Format Specifier.

123.456 ("C", en-US) -> $123.46

123.456 ("C", fr-FR) -> 123,46 €

123.456 ("C", ja-JP) -> ¥123

-123.456 ("C3", en-US) -> ($123.456)

-123.456 ("C3", fr-FR) -> -123,456 €

-123.456 ("C3", ja-JP) -> -¥123.456

"D" or "d"

Decimal

Result: Integer digits with optional negative sign.

Supported by: Integral types only.

Precision specifier: Minimum number of digits.

Default precision specifier: Minimum number of digits required.

More information: The Decimal("D") Format Specifier.

1234 ("D") -> 1234

-1234 ("D6") -> -001234

"E" or "e"

Exponential (scientific)

Result: Exponential notation.

Supported by: All numeric types.

Precision specifier: Number of decimal digits.

Default precision specifier: 6.

More information: The Exponential ("E") Format Specifier.

1052.0329112756 ("E", en-US) -> 1.052033E+003

1052.0329112756 ("e", fr-FR) -> 1,052033e+003

-1052.0329112756 ("e2", en-US) -> -1.05e+003

-1052.0329112756 ("E2", fr_FR) -> -1,05E+003

"F" or "f"

Fixed-point

Result: Integral and decimal digits with optional negative sign.

Supported by: All numeric types.

Precision specifier: Number of decimal digits.

Default precision specifier: Defined byNumberFormatInfo.NumberDecimalDigits.

More information: The Fixed-Point ("F") Format Specifier.

1234.567 ("F", en-US) -> 1234.57

1234.567 ("F", de-DE) -> 1234,57

1234 ("F1", en-US) -> 1234.0

1234 ("F1", de-DE) -> 1234,0

-1234.56 ("F4", en-US) -> -1234.5600

-1234.56 ("F4", de-DE) -> -1234,5600

"G" or "g"

General

Result: The most compact of either fixed-point or scientific notation.

Supported by: All numeric types.

Precision specifier: Number of significant digits.

Default precision specifier: Depends on numeric type.

More information: The General ("G") Format Specifier.

-123.456 ("G", en-US) -> -123.456

123.456 ("G", sv-SE) -> -123,456

123.4546 ("G4", en-US) -> 123.5

123.4546 ("G4", sv-SE) -> 123,5

-1.234567890e-25 ("G", en-US) -> -1.23456789E-25

-1.234567890e-25 ("G", sv-SE) -> -1,23456789E-25

"N" or "n"

Number

Result: Integral and decimal digits, group separators, and a decimal separator with optional negative sign.

Supported by: All numeric types.

Precision specifier: Desired number of decimal places.

Default precision specifier: Defined byNumberFormatInfo.NumberDecimalDigits.

More information: The Numeric ("N") Format Specifier.

1234.567 ("N", en-US) -> 1,234.57

1234.567 ("N", ru-RU) -> 1 234,57

1234 ("N1", en-US) -> 1,234.0

1234 ("N1", ru-RU) -> 1 234,0

-1234.56 ("N3", en-US) -> -1,234.560

-1234.56 ("N3", ru-RU) -> -1 234,560

"P" or "p"

Percent

Result: Number multiplied by 100 and displayed with a percent symbol.

Supported by: All numeric types.

Precision specifier: Desired number of decimal places.

Default precision specifier: Defined by NumberFormatInfo.PercentDecimalDigits.

More information: The Percent ("P") Format Specifier.

1 ("P", en-US) -> 100.00 %

1 ("P", fr-FR) -> 100,00 %

-0.39678 ("P1", en-US) -> -39.7 %

-0.39678 ("P1", fr-FR) -> -39,7 %

"R" or "r"

Round-trip

Result: A string that can round-trip to an identical number.

Supported by: SingleDouble, and BigInteger.

Precision specifier: Ignored.

More information: The Round-trip ("R") Format Specifier.

123456789.12345678 ("R") -> 123456789.12345678

-1234567890.12345678 ("R") -> -1234567890.1234567

"X" or "x"

Hexadecimal

Result: A hexadecimal string.

Supported by: Integral types only.

Precision specifier: Number of digits in the result string.

More information: The HexaDecimal ("X") Format Specifier.

255 ("X") -> FF

-1 ("x") -> ff

255 ("x4") -> 00ff

-1 ("X4") -> 00FF

Any other single character

Unknown specifier

Result: Throws a FormatException at run time.

 

 

Standard Numeric Format Strings

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原文地址:http://www.cnblogs.com/olartan/p/4278261.html

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