Int64.Parse Int64.Parse Int64.Parse Int64.Parse Method

定义

将数字的字符串表示形式转换为它的等效 64 位有符号整数。Converts the string representation of a number to its 64-bit signed integer equivalent.

重载

Parse(String, NumberStyles, IFormatProvider) Parse(String, NumberStyles, IFormatProvider) Parse(String, NumberStyles, IFormatProvider) Parse(String, NumberStyles, IFormatProvider)

将指定样式和区域性特定格式的数字的字符串表示形式转换为它的等效 64 位有符号整数。Converts the string representation of a number in a specified style and culture-specific format to its 64-bit signed integer equivalent.

Parse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider) Parse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider) Parse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider)
Parse(String, NumberStyles) Parse(String, NumberStyles) Parse(String, NumberStyles) Parse(String, NumberStyles)

将指定样式的数字的字符串表示形式转换为它的等效 64 位有符号整数。Converts the string representation of a number in a specified style to its 64-bit signed integer equivalent.

Parse(String) Parse(String) Parse(String) Parse(String)

将数字的字符串表示形式转换为它的等效 64 位有符号整数。Converts the string representation of a number to its 64-bit signed integer equivalent.

Parse(String, IFormatProvider) Parse(String, IFormatProvider) Parse(String, IFormatProvider) Parse(String, IFormatProvider)

将指定的区域性特定格式的数字的字符串表示形式转换为它的等效 64 位有符号整数。Converts the string representation of a number in a specified culture-specific format to its 64-bit signed integer equivalent.

Parse(String, NumberStyles, IFormatProvider) Parse(String, NumberStyles, IFormatProvider) Parse(String, NumberStyles, IFormatProvider) Parse(String, NumberStyles, IFormatProvider)

将指定样式和区域性特定格式的数字的字符串表示形式转换为它的等效 64 位有符号整数。Converts the string representation of a number in a specified style and culture-specific format to its 64-bit signed integer equivalent.

public:
 static long Parse(System::String ^ s, System::Globalization::NumberStyles style, IFormatProvider ^ provider);
public static long Parse (string s, System.Globalization.NumberStyles style, IFormatProvider provider);
static member Parse : string * System.Globalization.NumberStyles * IFormatProvider -> int64
Public Shared Function Parse (s As String, style As NumberStyles, provider As IFormatProvider) As Long

参数

s
String String String String

包含要转换的数字的字符串。A string containing a number to convert.

style
NumberStyles NumberStyles NumberStyles NumberStyles

枚举值的按位组合,用于指示可出现在 s 中的样式元素。A bitwise combination of enumeration values that indicates the style elements that can be present in s. 要指定的一个典型值为 IntegerA typical value to specify is Integer.

provider
IFormatProvider IFormatProvider IFormatProvider IFormatProvider

一个 IFormatProvider,它提供有关 s 的区域性特定格式设置信息。An IFormatProvider that supplies culture-specific formatting information about s.

返回

s 中指定的数字等效的 64 位带符号整数。A 64-bit signed integer equivalent to the number specified in s.

异常

style 不是 NumberStyles 值。style is not a NumberStyles value.

-or- style 不是 AllowHexSpecifierHexNumber 值的组合。style is not a combination of AllowHexSpecifier and HexNumber values.

s 的格式不符合 styles is not in a format compliant with style.

s 表示一个小于 MinValue 或大于 MaxValue 的数字。s represents a number less than MinValue or greater than MaxValue.

-or- style 支持小数位,但 s 包括非零的小数位。style supports fractional digits, but s includes non-zero fractional digits.

示例

下面的示例使用各种styleprovider参数来Int64分析值的字符串表示形式。The following example uses a variety of style and provider parameters to parse the string representations of Int64 values. 它还说明了根据用于分析操作的格式设置信息的区域性,可解释相同字符串的一些不同方法。It also illustrates some of the different ways the same string can be interpreted depending on the culture whose formatting information is used for the parsing operation.

using System;
using System.Globalization;

public class ParseInt64
{
   public static void Main()
   {
      Convert("12,000", NumberStyles.Float | NumberStyles.AllowThousands, 
              new CultureInfo("en-GB"));
      Convert("12,000", NumberStyles.Float | NumberStyles.AllowThousands,
              new CultureInfo("fr-FR"));
      Convert("12,000", NumberStyles.Float, new CultureInfo("en-US"));
      
      Convert("12 425,00", NumberStyles.Float | NumberStyles.AllowThousands,
              new CultureInfo("sv-SE"));
      Convert("12,425.00", NumberStyles.Float | NumberStyles.AllowThousands,
              NumberFormatInfo.InvariantInfo);
      Convert("631,900", NumberStyles.Integer | NumberStyles.AllowDecimalPoint, 
              new CultureInfo("fr-FR"));
      Convert("631,900", NumberStyles.Integer | NumberStyles.AllowDecimalPoint,
              new CultureInfo("en-US"));
      Convert("631,900", NumberStyles.Integer | NumberStyles.AllowThousands,
              new CultureInfo("en-US"));
   }

   private static void Convert(string value, NumberStyles style, 
                               IFormatProvider provider)
   {
      try
      {
         long number = Int64.Parse(value, style, provider);
         Console.WriteLine("Converted '{0}' to {1}.", value, number);
      }
      catch (FormatException)
      {
         Console.WriteLine("Unable to convert '{0}'.", value);
      }   
      catch (OverflowException)
      {
         Console.WriteLine("'{0}' is out of range of the Int64 type.", value);   
      }
   }                               
}
// This example displays the following output to the console:
//       Converted '12,000' to 12000.
//       Converted '12,000' to 12.
//       Unable to convert '12,000'.
//       Converted '12 425,00' to 12425.
//       Converted '12,425.00' to 12425.
//       '631,900' is out of range of the Int64 type.
//       Unable to convert '631,900'.
//       Converted '631,900' to 631900.
Imports System.Globalization

Module ParseInt64
   Public Sub Main()
      Convert("12,000", NumberStyles.Float Or NumberStyles.AllowThousands, _
              New CultureInfo("en-GB"))      
      Convert("12,000", NumberStyles.Float Or NumberStyles.AllowThousands, _
              New CultureInfo("fr-FR"))
      Convert("12,000", NumberStyles.Float, New CultureInfo("en-US"))
      
      Convert("12 425,00", NumberStyles.Float Or NumberStyles.AllowThousands, _
              New CultureInfo("sv-SE")) 
      Convert("12,425.00", NumberStyles.Float Or NumberStyles.AllowThousands, _
              NumberFormatInfo.InvariantInfo) 
      Convert("631,900", NumberStyles.Integer Or NumberStyles.AllowDecimalPoint, _ 
              New CultureInfo("fr-FR"))
      Convert("631,900", NumberStyles.Integer Or NumberStyles.AllowDecimalPoint, _
              New CultureInfo("en-US"))
      Convert("631,900", NumberStyles.Integer Or NumberStyles.AllowThousands, _
              New CultureInfo("en-US"))
   End Sub

   Private Sub Convert(value As String, style As NumberStyles, _
                       provider As IFormatProvider)
      Try
         Dim number As Long = Int64.Parse(value, style, provider)
         Console.WriteLine("Converted '{0}' to {1}.", value, number)
      Catch e As FormatException
         Console.WriteLine("Unable to convert '{0}'.", value)
      Catch e As OverflowException
         Console.WriteLine("'{0}' is out of range of the Int64 type.", value)   
      End Try
   End Sub                       
End Module
' This example displays the following output to the console:
'       Converted '12,000' to 12000.
'       Converted '12,000' to 12.
'       Unable to convert '12,000'.
'       Converted '12 425,00' to 12425.
'       Converted '12,425.00' to 12425.
'       '631,900' is out of range of the Int64 type.
'       Unable to convert '631,900'.
'       Converted '631,900' to 631900.

注解

参数定义允许s在参数中执行的样式元素(如空格或正号),以便分析操作成功。 styleThe style parameter defines the style elements (such as white space or the positive sign) that are allowed in the s parameter for the parse operation to succeed. 它必须是NumberStyles枚举中的位标志的组合。It must be a combination of bit flags from the NumberStyles enumeration. 根据的值style s , 参数可能包括以下元素:Depending on the value of style, the s parameter may include the following elements:

[ws][$][sign][digits,]digits[.fractional_digits][e[sign]exponential_digits][ws][ws][$][sign][digits,]digits[.fractional_digits][e[sign]exponential_digits][ws]

或者,如果style包括AllowHexSpecifierOr, if style includes AllowHexSpecifier:

[ws]hexdigits[ws][ws]hexdigits[ws]

方括号 ([ and ]) 中的元素是可选的。Elements in square brackets ([ and ]) are optional. 下表对每个元素进行了描述。The following table describes each element.

元素Element 说明Description
wsws 可选空白。Optional white space. s s style NumberStyles.AllowTrailingWhite如果包含style 标志,则空格可以出现在的开头,如果包含标志,则可以在NumberStyles.AllowLeadingWhite的末尾出现空白。White space can appear at the beginning of s if style includes the NumberStyles.AllowLeadingWhite flag, and it can appear at the end of s if style includes the NumberStyles.AllowTrailingWhite flag.
$ 区域性特定的货币符号。A culture-specific currency symbol. 其在字符串中的NumberFormatInfo.CurrencyPositivePattern位置由provider参数GetFormat方法返回的NumberFormatInfo对象的属性定义。Its position in the string is defined by the NumberFormatInfo.CurrencyPositivePattern property of the NumberFormatInfo object returned by the GetFormat method of the provider parameter. 如果s style包含标志,则货币符号可以出现在中。NumberStyles.AllowCurrencySymbolThe currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag.
signsign 一个可选的符号。An optional sign. s如果style 包含标志或的s末尾包含style标志,则符号可以出现在的开头。 NumberStyles.AllowTrailingSign NumberStyles.AllowLeadingSignThe sign can appear at the beginning of s if style includes the NumberStyles.AllowLeadingSign flag or at the end of s if style includes the NumberStyles.AllowTrailingSign flag. 如果包含s style标志,则可以在中使用括号来表示负值。NumberStyles.AllowParenthesesParentheses can be used in s to indicate a negative value if style includes the NumberStyles.AllowParentheses flag.
digitsdigits

fractional_digitsfractional_digits

exponential_digitsexponential_digits
介于0到9之间的一系列数字。A sequence of digits from 0 through 9.
, 区域性特定的千位分隔符。A culture-specific thousands separator symbol. provider s如果包含NumberStyles.AllowThousands标志,则指定的区域性的千位分隔符可以出现在中。 styleThe thousands separator of the culture specified by provider can appear in s if style includes the NumberStyles.AllowThousands flag.
.. 区域性特定的小数点符号。A culture-specific decimal point symbol. provider s如果包含NumberStyles.AllowDecimalPoint标志, 则指定的区域性的小数点符号可以出现在中。 styleThe decimal point symbol of the culture specified by provider can appear in s if style includes the NumberStyles.AllowDecimalPoint flag.

只有数字0才能作为小数位出现,以便分析操作成功;如果fractional_digits包含任何其他数字, OverflowException则会引发。Only the digit 0 can appear as a fractional digit for the parse operation to succeed; if fractional_digits includes any other digit, an OverflowException is thrown.
ee "E" 或 "E" 字符,指示值以指数表示法表示。The 'e' or 'E' character, which indicates that the value is represented in exponential notation. 如果s 包含标志NumberStyles.AllowExponent , 则参数可以表示指数表示法中的数字。 styleThe s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag.
hexdigitshexdigits 从0到 f 的十六进制数字序列, 或者从0到 F。A sequence of hexadecimal digits from 0 through f, or 0 through F.

备注

无论style参数的值如何, 分析操作都将s忽略中的任何终止 NUL (U + 0000) 字符。Any terminating NUL (U+0000) characters in s are ignored by the parsing operation, regardless of the value of the style argument.

仅带十进制数字的字符串(对应NumberStyles.None于样式)始终在Int64类型范围内成功分析。A string with decimal digits only (which corresponds to the NumberStyles.None style) always parses successfully if it is in the range of the Int64 type. 大多数其余NumberStyles成员控件元素在此输入字符串中可能已存在但不是必需的。Most of the remaining NumberStyles members control elements that may be but are not required to be present in this input string. 下表指示各个NumberStyles成员如何影响可能出现在中s的元素。The following table indicates how individual NumberStyles members affect the elements that may be present in s.

非复合 NumberStyles 值Non-composite NumberStyles values 除数字外允许在 s 中使用的元素Elements permitted in s in addition to digits
NumberStyles.None 仅十进制数字。Decimal digits only.
NumberStyles.AllowDecimalPoint 小数点( .The decimal point ( . )和小数位数元素。) and fractional-digits elements. 但是,小数位数必须仅包含一个或多个0位数字OverflowException ,否则将引发。However, fractional-digits must consist of only one or more 0 digits or an OverflowException is thrown.
NumberStyles.AllowExponent s参数还可以使用指数表示法。The s parameter can also use exponential notation.
NumberStyles.AllowLeadingWhite 开头sws元素。The ws element at the beginning of s.
NumberStyles.AllowTrailingWhite 末尾s处的ws元素。The ws element at the end of s.
NumberStyles.AllowLeadingSign 符号可以出现在数字之前。A sign can appear before digits.
NumberStyles.AllowTrailingSign 符号可以出现在数字之后。A sign can appear after digits.
NumberStyles.AllowParentheses 用括号括起数值的符号元素。The sign element in the form of parentheses enclosing the numeric value.
NumberStyles.AllowThousands 千位分隔符( )元素。The thousands separator ( , ) element.
NumberStyles.AllowCurrencySymbol $ 元素。The $ element.

如果使用s标志,则必须是不带前缀的十六进制值。 NumberStyles.AllowHexSpecifierIf the NumberStyles.AllowHexSpecifier flag is used, s must be a hexadecimal value without a prefix. 例如,"C9AF3" 分析成功,但 "0xC9AF3" 不能。For example, "C9AF3" parses successfully, but "0xC9AF3" does not. style可以存在的唯一其他标志是NumberStyles.AllowLeadingWhiteNumberStyles.AllowTrailingWhiteThe only other flags that can be present in style are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (枚举具有复合数字样式, NumberStyles.HexNumber其中包含两个空格标志。) NumberStyles(The NumberStyles enumeration has a composite number style, NumberStyles.HexNumber, that includes both white space flags.)

参数是一个CultureInfo实现,如或对象。 NumberFormatInfo IFormatProvider providerThe provider parameter is an IFormatProvider implementation, such as a NumberFormatInfo or CultureInfo object. provider参数提供用于分析的特定于区域性的信息。The provider parameter supplies culture-specific information used in parsing. 如果provider NumberFormatInfonull,则使用当前区域性的。If provider is null, the NumberFormatInfo for the current culture is used.

另请参阅

Parse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider) Parse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider) Parse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider)

public static long Parse (ReadOnlySpan<char> s, System.Globalization.NumberStyles style = System.Globalization.NumberStyles.Integer, IFormatProvider provider = null);
static member Parse : ReadOnlySpan<char> * System.Globalization.NumberStyles * IFormatProvider -> int64
Public Shared Function Parse (s As ReadOnlySpan(Of Char), Optional style As NumberStyles = System.Globalization.NumberStyles.Integer, Optional provider As IFormatProvider = null) As Long

参数

返回

Parse(String, NumberStyles) Parse(String, NumberStyles) Parse(String, NumberStyles) Parse(String, NumberStyles)

将指定样式的数字的字符串表示形式转换为它的等效 64 位有符号整数。Converts the string representation of a number in a specified style to its 64-bit signed integer equivalent.

public:
 static long Parse(System::String ^ s, System::Globalization::NumberStyles style);
public static long Parse (string s, System.Globalization.NumberStyles style);
static member Parse : string * System.Globalization.NumberStyles -> int64
Public Shared Function Parse (s As String, style As NumberStyles) As Long

参数

s
String String String String

包含要转换的数字的字符串。A string containing a number to convert.

style
NumberStyles NumberStyles NumberStyles NumberStyles

NumberStyles 值的按位组合,指示 s 的允许格式。A bitwise combination of NumberStyles values that indicates the permitted format of s. 要指定的一个典型值为 IntegerA typical value to specify is Integer.

返回

s 中指定的数字等效的 64 位带符号整数。A 64-bit signed integer equivalent to the number specified in s.

异常

style 不是 NumberStyles 值。style is not a NumberStyles value.

-or- style 不是 AllowHexSpecifierHexNumber 值的组合。style is not a combination of AllowHexSpecifier and HexNumber values.

s 的格式不符合 styles is not in a format compliant with style.

s 表示一个小于 MinValue 或大于 MaxValue 的数字。s represents a number less than MinValue or greater than MaxValue.

-or- style 支持小数位,但 s 包括非零的小数位。style supports fractional digits but s includes non-zero fractional digits.

示例

下面的示例使用Int64.Parse(String, NumberStyles)方法分析多个Int64值的字符串表示形式。The following example uses the Int64.Parse(String, NumberStyles) method to parse the string representations of several Int64 values. 该示例的当前区域性为 en-us。The current culture for the example is en-US.

using System;
using System.Globalization;

public class ParseInt32
{
   public static void Main()
   {
      Convert("104.0", NumberStyles.AllowDecimalPoint);
      Convert("104.9", NumberStyles.AllowDecimalPoint);
      Convert (" 106034", NumberStyles.None);
      Convert(" $17,198,064.42", NumberStyles.AllowCurrencySymbol |
                                 NumberStyles.Number);
      Convert(" $17,198,064.00", NumberStyles.AllowCurrencySymbol |
                                 NumberStyles.Number);
      Convert("103E06", NumberStyles.AllowExponent);
      Convert("1200E-02", NumberStyles.AllowExponent);
      Convert("1200E-03", NumberStyles.AllowExponent);
      Convert("-1,345,791", NumberStyles.AllowThousands);
      Convert("(1,345,791)", NumberStyles.AllowThousands |
                             NumberStyles.AllowParentheses);
      Convert("FFCA00A0", NumberStyles.HexNumber);                       
      Convert("0xFFCA00A0", NumberStyles.HexNumber);                       
   }

   private static void Convert(string value, NumberStyles style)
   {
      try
      {
         long number = Int64.Parse(value, style);
         Console.WriteLine("Converted '{0}' to {1}.", value, number);
      }
      catch (FormatException)
      {
         Console.WriteLine("Unable to convert '{0}'.", value);
      }
      catch (OverflowException)
      {
         Console.WriteLine("'{0}' is out of range of the Int64 type.", value);   
      }
   }
}
// The example displays the following output to the console:
//       Converted '104.0' to 104.
//       '104.9' is out of range of the Int64 type.
//       Unable to convert ' 106034'.
//       ' $17,198,064.42' is out of range of the Int64 type.
//       Converted ' $17,198,064.00' to 17198064.
//       Converted '103E06' to 103000000.
//       Converted '1200E-02' to 12.
//       '1200E-03' is out of range of the Int64 type.
//       Unable to convert '-1,345,791'.
//       Converted '(1,345,791)' to -1345791.
//       Converted 'FFCA00A0' to 4291428512.
//       Unable to convert '0xFFCA00A0'.
Imports System.Globalization

Module ParseInt64
   Public Sub Main()
      Convert("104.0", NumberStyles.AllowDecimalPoint)    
      Convert("104.9", NumberStyles.AllowDecimalPoint)
      Convert (" 106034", NumberStyles.None)
      Convert(" $17,198,064.42", NumberStyles.AllowCurrencySymbol Or _
                                 NumberStyles.Number)
      Convert(" $17,198,064.00", NumberStyles.AllowCurrencySymbol Or _
                                 NumberStyles.Number)
      Convert("103E06", NumberStyles.AllowExponent)  
      Convert("1200E-02", NumberStyles.AllowExponent)
      Convert("1200E-03", NumberStyles.AllowExponent)
      Convert("-1,345,791", NumberStyles.AllowThousands)
      Convert("(1,345,791)", NumberStyles.AllowThousands Or _
                             NumberStyles.AllowParentheses)
      Convert("FFCA00A0", NumberStyles.HexNumber)                       
      Convert("0xFFCA00A0", NumberStyles.HexNumber)                       
   End Sub
   
   Private Sub Convert(value As String, style As NumberStyles)
      Try
         Dim number As Long = Int64.Parse(value, style)
         Console.WriteLine("Converted '{0}' to {1}.", value, number)
      Catch e As FormatException
         Console.WriteLine("Unable to convert '{0}'.", value)
      Catch e As OverflowException
         Console.WriteLine("'{0}' is out of range of the Int64 type.", value)   
      End Try
   End Sub
End Module
' The example displays the following output to the console:
'       Converted '104.0' to 104.
'       '104.9' is out of range of the Int64 type.
'       Unable to convert ' 106034'.
'       ' $17,198,064.42' is out of range of the Int64 type.
'       Converted ' $17,198,064.00' to 17198064.
'       Converted '103E06' to 103000000.
'       Converted '1200E-02' to 12.
'       '1200E-03' is out of range of the Int64 type.
'       Unable to convert '-1,345,791'.
'       Converted '(1,345,791)' to -1345791.
'       Converted 'FFCA00A0' to 4291428512.
'       Unable to convert '0xFFCA00A0'.

注解

参数定义s参数中允许的样式元素(如空格、正负号或千位分隔符符号),以便分析操作成功。 styleThe style parameter defines the style elements (such as white space, the positive or negative sign symbol, or the thousands separator symbol) that are allowed in the s parameter for the parse operation to succeed. 它必须是NumberStyles枚举中的位标志的组合。It must be a combination of bit flags from the NumberStyles enumeration. 根据的值style s ,参数可能包含以下元素:Depending on the value of style, the s parameter may contain the following elements:

[ws][$][sign][digits,]digits[.fractional_digits][e[sign]exponential_digits][ws][ws][$][sign][digits,]digits[.fractional_digits][e[sign]exponential_digits][ws]

或者,如果style包括AllowHexSpecifierOr, if style includes AllowHexSpecifier:

[ws]hexdigits[ws][ws]hexdigits[ws]

方括号 ([ and ]) 中的元素是可选的。Elements in square brackets ([ and ]) are optional. 下表对每个元素进行了描述。The following table describes each element.

元素Element 说明Description
wsws 可选空白。Optional white space. s s style NumberStyles.AllowTrailingWhite如果包含style 标志,则空格可以出现在的开头,如果包含标志,则可以在NumberStyles.AllowLeadingWhite的末尾出现空白。White space can appear at the beginning of s if style includes the NumberStyles.AllowLeadingWhite flag, and it can appear at the end of s if style includes the NumberStyles.AllowTrailingWhite flag.
$ 区域性特定的货币符号。A culture-specific currency symbol. 其在字符串中的位置由NumberFormatInfo.CurrencyNegativePattern当前区域性的和NumberFormatInfo.CurrencyPositivePattern属性定义。Its position in the string is defined by the NumberFormatInfo.CurrencyNegativePattern and NumberFormatInfo.CurrencyPositivePattern properties of the current culture. 如果s style包含标志,则当前区域性的货币符号可以出现在中。NumberStyles.AllowCurrencySymbolThe current culture's currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag.
signsign 一个可选的符号。An optional sign. s s style NumberStyles.AllowTrailingSign如果包含style 标志,则符号可以出现在的开头,如果包含标志,则它可以NumberStyles.AllowLeadingSign出现在的末尾。The sign can appear at the beginning of s if style includes the NumberStyles.AllowLeadingSign flag, and it can appear at the end of s if style includes the NumberStyles.AllowTrailingSign flag. 如果包含s style标志,则可以在中使用括号来表示负值。NumberStyles.AllowParenthesesParentheses can be used in s to indicate a negative value if style includes the NumberStyles.AllowParentheses flag.
digitsdigits

fractional_digitsfractional_digits

exponential_digitsexponential_digits
介于0到9之间的一系列数字。A sequence of digits from 0 through 9. 对于fractional_digits,只有数字0有效。For fractional_digits, only the digit 0 is valid.
, 区域性特定的千位分隔符。A culture-specific thousands separator symbol. 如果s style包含标志,则当前区域性的千位分隔符可以出现在中。NumberStyles.AllowThousandsThe current culture's thousands separator can appear in s if style includes the NumberStyles.AllowThousands flag.
.. 区域性特定的小数点符号。A culture-specific decimal point symbol. 如果s style包含标志,则当前区域性的小数点符号可以出现在中。NumberStyles.AllowDecimalPointThe current culture's decimal point symbol can appear in s if style includes the NumberStyles.AllowDecimalPoint flag. 只有数字0才能作为小数位出现,以便分析操作成功;如果fractional_digits包含任何其他数字, OverflowException则会引发。Only the digit 0 can appear as a fractional digit for the parse operation to succeed; if fractional_digits includes any other digit, an OverflowException is thrown.
ee "E" 或 "E" 字符,指示值以指数表示法表示。The 'e' or 'E' character, which indicates that the value is represented in exponential notation. 如果s 包含标志NumberStyles.AllowExponent , 则参数可以表示指数表示法中的数字。 styleThe s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag.
hexdigitshexdigits 从0到 f 的十六进制数字序列, 或者从0到 F。A sequence of hexadecimal digits from 0 through f, or 0 through F.

备注

无论style参数的值如何, 分析操作都将s忽略中的任何终止 NUL (U + 0000) 字符。Any terminating NUL (U+0000) characters in s are ignored by the parsing operation, regardless of the value of the style argument.

只有数字(对应NumberStyles.None于样式)的字符串在Int64类型范围内时才会成功进行分析。A string with digits only (which corresponds to the NumberStyles.None style) always parses successfully if it is in the range of the Int64 type. 大多数其余NumberStyles成员控件元素在输入字符串中可能存在但不是必需的。Most of the remaining NumberStyles members control elements that may be but are not required to be present in the input string. 下表指示各个NumberStyles成员如何影响可能出现在中s的元素。The following table indicates how individual NumberStyles members affect the elements that may be present in s.

NumberStyles 值NumberStyles value 除数字外允许在 s 中使用的元素Elements permitted in s in addition to digits
None 仅限数字元素。The digits element only.
AllowDecimalPoint 小数点( .The decimal point ( . )和小数位数元素。) and fractional-digits elements.
AllowExponent s参数还可以使用指数表示法。The s parameter can also use exponential notation. 如果s表示指数表示法中的数字,则生成的数值不能包含任何非零的小数位。If s represents a number in exponential notation, the resulting numeric value cannot include any non-zero fractional digits.
AllowLeadingWhite 开头sws元素。The ws element at the beginning of s.
AllowTrailingWhite 末尾s处的ws元素。The ws element at the end of s.
AllowLeadingSign 开头ssign元素。The sign element at the beginning of s.
AllowTrailingSign 末尾ssign元素。The sign element at the end of s.
AllowParentheses 用括号括起数值的符号元素。The sign element in the form of parentheses enclosing the numeric value.
AllowThousands 千位分隔符( )元素。The thousands separator ( , ) element.
AllowCurrencySymbol $ 元素。The $ element.
Currency 全部。All. s参数不能表示十六进制数或以指数表示法表示的数字。The s parameter cannot represent a hexadecimal number or a number in exponential notation.
Float 位于的开头或结尾s处的 ws 元素,在开头 s和小数点( .The ws element at the beginning or end of s, sign at the beginning of s, and the decimal point ( . 代号.) symbol. s参数还可以使用指数表示法。The s parameter can also use exponential notation.
Number Wssign、千位分隔符( )和小数点( .The ws, sign, thousands separator ( , ), and decimal point ( . 单元.) elements.
Any 除之外s的所有样式都不能表示十六进制数。All styles, except s cannot represent a hexadecimal number.

如果使用s标志,则必须是不带前缀的十六进制值。 NumberStyles.AllowHexSpecifierIf the NumberStyles.AllowHexSpecifier flag is used, s must be a hexadecimal value without a prefix. 例如,"C9AF3" 分析成功,但 "0xC9AF3" 不能。For example, "C9AF3" parses successfully, but "0xC9AF3" does not. 只能与s参数组合的其他标志是NumberStyles.AllowLeadingWhiteNumberStyles.AllowTrailingWhiteThe only other flags that can be combined with the s parameter are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (枚举包含复合数字样式, NumberStyles.HexNumber其中包含两个空格标志。) NumberStyles(The NumberStyles enumeration includes a composite number style, NumberStyles.HexNumber, that includes both white space flags.)

使用为当前系统区域性初始化的NumberFormatInfo对象中的格式设置信息分析参数。sThe s parameter is parsed using the formatting information in a NumberFormatInfo object that is initialized for the current system culture. 若要指定其格式设置信息用于分析操作的区域性, 请调用Int64.Parse(String, NumberStyles, IFormatProvider)重载。To specify the culture whose formatting information is used for the parse operation, call the Int64.Parse(String, NumberStyles, IFormatProvider) overload.

另请参阅

Parse(String) Parse(String) Parse(String) Parse(String)

将数字的字符串表示形式转换为它的等效 64 位有符号整数。Converts the string representation of a number to its 64-bit signed integer equivalent.

public:
 static long Parse(System::String ^ s);
public static long Parse (string s);
static member Parse : string -> int64
Public Shared Function Parse (s As String) As Long

参数

s
String String String String

包含要转换的数字的字符串。A string containing a number to convert.

返回

s 中包含的数字等效的 64 位有符号整数。A 64-bit signed integer equivalent to the number contained in s.

异常

s 的格式不正确。s is not in the correct format.

s 表示一个小于 MinValue 或大于 MaxValue 的数字。s represents a number less than MinValue or greater than MaxValue.

示例

下面的示例演示如何使用Int64.Parse(String)方法将字符串值转换为64位带符号整数值。The following example demonstrates how to convert a string value into a 64-bit signed integer value using the Int64.Parse(String) method. 然后,它会显示生成的长整数值。It then displays the resulting long integer value.

using System;

public class ParseInt64
{
   public static void Main()
   {
      Convert("  179042  ");
      Convert(" -2041326 ");
      Convert(" +8091522 ");
      Convert("   1064.0   ");
      Convert("  178.3");
      Convert(String.Empty);
      Convert(((decimal) Int64.MaxValue) + 1.ToString());
   }

   private static void Convert(string value)
   {
      try
      {
         long number = Int64.Parse(value);
         Console.WriteLine("Converted '{0}' to {1}.", value, number);
      }
      catch (FormatException)
      {
         Console.WriteLine("Unable to convert '{0}'.", value);
      }
      catch (OverflowException)
      {
         Console.WriteLine("'{0}' is out of range.", value);
      }
   }
}
// This example displays the following output to the console:
//       Converted '  179042  ' to 179042.
//       Converted ' -2041326 ' to -2041326.
//       Converted ' +8091522 ' to 8091522.
//       Unable to convert '   1064.0   '.
//       Unable to convert '  178.3'.
//       Unable to convert ''.
//       '92233720368547758071' is out of range.
Module ParseInt64
   Public Sub Main()
      Convert("  179032  ")
      Convert(" -2041326 ")
      Convert(" +8091522 ")
      Convert("   1064.0   ")
      Convert("  178.3")
      Convert(String.Empty)
      Convert((CDec(Int64.MaxValue) + 1).ToString())
   End Sub

   Private Sub Convert(value As String)
      Try
         Dim number As Long = Int64.Parse(value)
         Console.WriteLine("Converted '{0}' to {1}.", value, number)
      Catch e As FormatException
         Console.WriteLine("Unable to convert '{0}'.", value)
      Catch e As OverflowException
         Console.WriteLine("'{0}' is out of range.", value)      
      End Try
   End Sub
End Module
' This example displays the following output to the console:
'       Converted '  179032  ' to 179032.
'       Converted ' -2041326 ' to -2041326.
'       Converted ' +8091522 ' to 8091522.
'       Unable to convert '   1064.0   '.
'       Unable to convert '  178.3'.
'       Unable to convert ''.
'       '9223372036854775808' is out of range.

注解

s参数包含以下格式的编号:The s parameter contains a number of the form:

[ws][sign]digits[ws][ws][sign]digits[ws]

方括号 ([ and ]) 中的元素是可选的。Elements in square brackets ([ and ]) are optional. 下表对每个元素进行了描述。The following table describes each element.

元素Element 说明Description
wsws 可选空白。Optional white space.
Signsign 一个可选的符号。An optional sign.
数字digits 介于0到9之间的一系列数字。A sequence of digits ranging from 0 to 9.

使用样式对s NumberStyles.Integer参数进行解释。The s parameter is interpreted using the NumberStyles.Integer style. 除了十进制数字外,只允许使用前导和尾随空格以及前导符号。In addition to decimal digits, only leading and trailing spaces together with a leading sign are allowed. 若要显式定义可出现在中s的样式元素,请使用Int64.Parse(String, NumberStyles)Int64.Parse(String, NumberStyles, IFormatProvider)方法。To explicitly define the style elements that can be present in s, use either the Int64.Parse(String, NumberStyles) or the Int64.Parse(String, NumberStyles, IFormatProvider) method.

使用为当前系统区域性初始化的NumberFormatInfo对象中的格式设置信息分析参数。sThe s parameter is parsed using the formatting information in a NumberFormatInfo object that is initialized for the current system culture. 若要使用其他某个区域性的格式设置信息分析字符串,请使用Int64.Parse(String, NumberStyles, IFormatProvider)方法。To parse a string using the formatting information of some other culture, use the Int64.Parse(String, NumberStyles, IFormatProvider) method.

另请参阅

Parse(String, IFormatProvider) Parse(String, IFormatProvider) Parse(String, IFormatProvider) Parse(String, IFormatProvider)

将指定的区域性特定格式的数字的字符串表示形式转换为它的等效 64 位有符号整数。Converts the string representation of a number in a specified culture-specific format to its 64-bit signed integer equivalent.

public:
 static long Parse(System::String ^ s, IFormatProvider ^ provider);
public static long Parse (string s, IFormatProvider provider);
static member Parse : string * IFormatProvider -> int64
Public Shared Function Parse (s As String, provider As IFormatProvider) As Long

参数

s
String String String String

包含要转换的数字的字符串。A string containing a number to convert.

provider
IFormatProvider IFormatProvider IFormatProvider IFormatProvider

一个对象,提供有关 s 的区域性特定格式设置信息。An object that supplies culture-specific formatting information about s.

返回

s 中指定的数字等效的 64 位带符号整数。A 64-bit signed integer equivalent to the number specified in s.

异常

s 的格式不正确。s is not in the correct format.

s 表示一个小于 MinValue 或大于 MaxValue 的数字。s represents a number less than MinValue or greater than MaxValue.

示例

下面的示例是 Web 窗体的按钮单击事件处理程序。The following example is the button click event handler of a Web form. 它使用HttpRequest.UserLanguages属性返回的数组来确定用户的区域设置。It uses the array returned by the HttpRequest.UserLanguages property to determine the user's locale. 然后,它将CultureInfo实例化对应于该区域设置的对象。It then instantiates a CultureInfo object that corresponds to that locale. 然后,将属于该CultureInfo对象的Parse(String, IFormatProvider) Int64 NumberFormatInfo对象传递给方法,以将用户的输入转换为值。The NumberFormatInfo object that belongs to that CultureInfo object is then passed to the Parse(String, IFormatProvider) method to convert the user's input to an Int64 value.

protected void OkToLong_Click(object sender, EventArgs e)
{
   string locale;
   long number;
   CultureInfo culture;

   // Return if string is empty
   if (String.IsNullOrEmpty(this.inputNumber.Text))
      return;

   // Get locale of web request to determine possible format of number
   if (Request.UserLanguages.Length == 0)
      return;
   locale = Request.UserLanguages[0];
   if (String.IsNullOrEmpty(locale))
      return;

  // Instantiate CultureInfo object for the user's locale
   culture = new CultureInfo(locale);

   // Convert user input from a string to a number
   try
   {
      number = Int64.Parse(this.inputNumber.Text, culture.NumberFormat);
   }
   catch (FormatException)
   {
      return;
   }
   catch (Exception)
   {
      return;
   }
   // Output number to label on web form
   this.outputNumber.Text = "Number is " + number.ToString();
}
Protected Sub OkToLong_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles OkToLong.Click
   Dim locale As String
   Dim culture As CultureInfo
   Dim number As Long

   ' Return if string is empty
   If String.IsNullOrEmpty(Me.inputNumber.Text) Then Exit Sub

   ' Get locale of web request to determine possible format of number
   If Request.UserLanguages.Length = 0 Then Exit Sub
   locale = Request.UserLanguages(0)
   If String.IsNullOrEmpty(locale) Then Exit Sub

   ' Instantiate CultureInfo object for the user's locale
   culture = New CultureInfo(locale)

   ' Convert user input from a string to a number
   Try
      number = Int64.Parse(Me.inputNumber.Text, culture.NumberFormat)
   Catch ex As FormatException
      Exit Sub
   Catch ex As Exception
      Exit Sub
   End Try

   ' Output number to label on web form
   Me.outputNumber.Text = "Number is " & number.ToString()
End Sub

注解

Parse(String, IFormatProvider)方法的重载通常用于将可以多种方式设置格式的文本转换Int64为值。This overload of the Parse(String, IFormatProvider) method is typically used to convert text that can be formatted in a variety of ways to an Int64 value. 例如,它可用于将用户输入的文本转换为一个数字值。For example, it can be used to convert the text entered by a user into an HTML text box to a numeric value.

s参数包含以下格式的编号:The s parameter contains a number of the form:

[ws][sign]digits[ws][ws][sign]digits[ws]

方括号([和])中的项是可选的,而其他项则如下所示。Items in square brackets ([ and ]) are optional, and other items are as follows.

wsws
可选空白。An optional white space.

Signsign
一个可选的符号。An optional sign.

数字digits
介于0到9之间的一系列数字。A sequence of digits ranging from 0 to 9.

使用样式对s NumberStyles.Integer参数进行解释。The s parameter is interpreted using the NumberStyles.Integer style. 除了十进制数字外,只允许使用前导和尾随空格以及前导符号。In addition to decimal digits, only leading and trailing spaces together with a leading sign are allowed. 若要显式定义可出现在中s的样式元素,请Int64.Parse(String, NumberStyles, IFormatProvider)使用方法。To explicitly define the style elements that can be present in s, use the Int64.Parse(String, NumberStyles, IFormatProvider) method.

参数是一个CultureInfo实现,如或对象。 NumberFormatInfo IFormatProvider providerThe provider parameter is an IFormatProvider implementation, such as a NumberFormatInfo or CultureInfo object. 参数提供有关的格式的s区域性特定信息。 providerThe provider parameter supplies culture-specific information about the format of s. 如果provider NumberFormatInfonull,则使用当前区域性的。If provider is null, the NumberFormatInfo for the current culture is used.

另请参阅

适用于