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ToString() 格式化字符串总结

發(fā)布時(shí)間:2023/12/15 编程问答 33 豆豆
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ToString()的標(biāo)準(zhǔn)格式化字符串分為3大類:枚舉類型的格式化字符串,數(shù)值類型的格式化字符串,和日期時(shí)間類型的格式化字符串。

日期時(shí)間類型的格式化字符串請(qǐng)見我的博客DateTime格式字符串。

Enumeration Format Strings

Format string

Result

G or g

Displays the enumeration entry as a string value, if possible, and otherwise displays the integer value of the current instance. If the enumeration is defined with the Flags attribute set, the string values of each valid entry are concatenated together, separated by commas. If the Flags attribute is not set, an invalid value is displayed as a numeric entry. The following example illustrates the G format specifier.

Visual Basic Copy Code Console.WriteLine(ConsoleColor.Red.ToString("G")) ' Displays Red Dim attributes As FileAttributes = FileAttributes.Hidden Or _FileAttributes.Archive Console.WriteLine(attributes.ToString("G")) ' Displays Hidden, Archive C# Copy Code Console.WriteLine(ConsoleColor.Red.ToString("G")); // Displays Red FileAttributes attributes = FileAttributes.Hidden |FileAttributes.Archive; Console.WriteLine(attributes.ToString("G")); // Displays Hidden, Archive

F or f

Displays the enumeration entry as a string value, if possible. If the value can be completely displayed as a summation of the entries in the enumeration (even if the Flags attribute is not present), the string values of each valid entry are concatenated together, separated by commas. If the value cannot be completely determined by the enumeration entries, then the value is formatted as the integer value. The following example illustrates the F format specifier.

Visual Basic Copy Code Console.WriteLine(ConsoleColor.Blue.ToString("F")) ' Displays Blue Dim attributes As FileAttributes = FileAttributes.Hidden Or _FileAttributes.Archive Console.WriteLine(attributes.ToString("F")) ' Displays Hidden, Archive C# Copy Code Console.WriteLine(ConsoleColor.Blue.ToString("F")); // Displays Blue FileAttributes attributes = FileAttributes.Hidden | FileAttributes.Archive; Console.WriteLine(attributes.ToString("F")); // Displays Hidden, Archive

D or d

Displays the enumeration entry as an integer value in the shortest representation possible. The following example illustrates the D format specifier.

Visual Basic Copy Code Console.WriteLine(ConsoleColor.Cyan.ToString("D")) ' Displays 11 Dim attributes As FileAttributes = FileAttributes.Hidden Or _FileAttributes.Archive Console.WriteLine(attributes.ToString("D")) ' Displays 34 C# Copy Code Console.WriteLine(ConsoleColor.Cyan.ToString("D")); // Displays 11 FileAttributes attributes = FileAttributes.Hidden |FileAttributes.Archive; Console.WriteLine(attributes.ToString("D")); // Displays 34

X or x

Displays the enumeration entry as a hexadecimal value. The value is represented with leading zeros as necessary, to ensure that the value is a minimum eight digits in length. The following example illustrates the X format specifier.

Visual Basic Copy Code Console.WriteLine(ConsoleColor.Cyan.ToString("X")) ' Displays 0000000B Dim attributes As FileAttributes = FileAttributes.Hidden Or _FileAttributes.Archive Console.WriteLine(attributes.ToString("X")) ' Displays 00000022 C# Copy Code Console.WriteLine(ConsoleColor.Cyan.ToString("X")); // Displays 0000000B FileAttributes attributes = FileAttributes.Hidden |FileAttributes.Archive; Console.WriteLine(attributes.ToString("X")); // Displays 00000022

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Standard Numeric Format Strings

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 by NumberFormatInfo.

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 by NumberFormatInfo.

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 by NumberFormatInfo.

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

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

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

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

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

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

-1234.56 ("N", 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.

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: Single, Double, 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.

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轉(zhuǎn)載于:https://www.cnblogs.com/jenneyblog/archive/2012/11/07/ToString_formatstring.html

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