Int64.Parse 方法

定義

將數字的字串表示轉換成它的對等 64 位元帶正負號的整數。Converts the string representation of a number to its 64-bit signed integer equivalent.

多載

Parse(String, NumberStyles, IFormatProvider)

將指定樣式和特定文化特性格式之數字的字串表示轉換成它的對等 64 位元帶正負號的整數。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(String, NumberStyles)

將指定樣式之數字的字串表示轉換成它的對等 64 位元帶正負號的整數。Converts the string representation of a number in a specified style to its 64-bit signed integer equivalent.

Parse(String)

將數字的字串表示轉換成它的對等 64 位元帶正負號的整數。Converts the string representation of a number to its 64-bit signed integer equivalent.

Parse(String, IFormatProvider)

將指定特定文化特性格式之數字的字串表示轉換成它的對等 64 位元帶正負號的整數。Converts the string representation of a number in a specified culture-specific format to its 64-bit signed integer equivalent.

Parse(String, NumberStyles, IFormatProvider)

將指定樣式和特定文化特性格式之數字的字串表示轉換成它的對等 64 位元帶正負號的整數。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

參數

s
String

字串,包含要轉換的數字。A string containing a number to convert.

style
NumberStyles

列舉值的位元組合,表示 s 中可以存在的樣式項目。A bitwise combination of enumeration values that indicates the style elements that can be present in s. 一般會指定的值是 IntegerA typical value to specify is Integer.

provider
IFormatProvider

IFormatProvider,提供 s 的相關特定文化特性格式資訊。An IFormatProvider that supplies culture-specific formatting information about s.

傳回

64 位元帶正負號的整數,與 s 中所指定的數字相等。A 64-bit signed integer equivalent to the number specified in s.

例外狀況

snulls is null.

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

-或--or- style 不是 AllowHexSpecifierHexNumber 值的組合。style is not a combination of AllowHexSpecifier and HexNumber values.

s 的格式與 style 不相容。s is not in a format compliant with style.

s 代表小於 MinValue 或大於 MaxValue 的數字。s represents a number less than MinValue or greater than MaxValue.

-或--or- style 支援小數數字,但 s 包含非零的小數數字。style supports fractional digits, but s includes non-zero fractional digits.

範例

下列範例會使用各種styleprovider參數來Int64剖析值的字串表示。The following example uses a variety of style and provider parameters to parse the string representations of Int64 values. 它也說明了一些不同的方式,可以根據用於剖析作業之格式資訊的文化特性來解讀相同的字串。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.

備註

參數會定義s參數中允許的樣式元素(例如空白字元或正號),使剖析作業成功。 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. 它必須是NumberStyles列舉中的位旗標組合。It must be a combination of bit flags from the NumberStyles enumeration. 視的值style s而定, 參數可能包含下列元素: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包含AllowHexSpecifierOr, if style includes AllowHexSpecifier:

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

在方括號 ([ 和 ]) 中的項目是選擇性的項目。Elements in square brackets ([ and ]) are optional. 下表說明每個元素。The following table describes each element.

元素Element 說明Description
wsws 選擇性的空白字元。Optional white space. s s style NumberStyles.AllowTrailingWhite如果包含style 旗標,空白字元可能會出現在開頭,而且如果包含旗標,它可以NumberStyles.AllowLeadingWhite出現在的結尾。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.
$ 特定文化特性的貨幣符號。A culture-specific currency symbol. 其在字串中的位置NumberFormatInfo.CurrencyPositivePattern是由provider參數的GetFormat方法所NumberFormatInfo傳回之物件的屬性所定義。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包含旗標,貨幣符號可能會出現在中。NumberStyles.AllowCurrencySymbolThe currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag.
簽署sign 選擇性的正負號。An optional sign. s s如果包含旗NumberStyles.AllowLeadingSign標,或結尾style包含旗標,則正負號可能會出現在的開頭。NumberStyles.AllowTrailingSign styleThe 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 旗標,則可以在中使用括弧來NumberStyles.AllowParentheses表示負數值。Parentheses can be used in s to indicate a negative value if style includes the NumberStyles.AllowParentheses flag.
digitsdigits

fractional_digitsfractional_digits

exponential_digitsexponential_digits
從0到9的數位序列。A sequence of digits from 0 through 9.
, 文化特性特定的千位分隔符號。A culture-specific thousands separator symbol. provider s如果包含NumberStyles.AllowThousands旗標,則所指定之文化特性的千位分隔符號可以出現在中。 styleThe thousands separator of the culture specified by provider can appear in s if style includes the NumberStyles.AllowThousands flag.
.. 文化特性特定的小數點符號。A culture-specific decimal point symbol. provider s如果包含NumberStyles.AllowDecimalPoint旗標, 則所指定文化特性的小數點符號會出現在中。 styleThe decimal point symbol of the culture specified by provider can appear in s if style includes the NumberStyles.AllowDecimalPoint flag.

只有數位0可以顯示為小數位數,剖析作業才會成功;如果fractional_digits包含任何其他數位, OverflowException則會擲回。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 ' 字元,表示該值是以指數標記法表示。The 'e' or 'E' character, which indicates that the value is represented in exponential notation. 如果s 包含旗NumberStyles.AllowExponent標, 參數可以表示指數標記法中的數位。 styleThe s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag.
hexdigitshexdigits 從0到 f 的十六進位數位序列, 或0到 F。A sequence of hexadecimal digits from 0 through f, or 0 through F.

注意

不論style引數的值為何, 剖析作業都會s忽略中的任何終止 NUL (U + 0000) 字元。Any terminating NUL (U+0000) characters in s are ignored by the parsing operation, regardless of the value of the style argument.

只有十進位數的字串(對應至NumberStyles.None樣式)一律會在Int64類型的範圍內成功剖析。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. 大部分的其餘NumberStyles成員控制專案,這些專案可能是但不需要出現在此輸入字串中。Most of the remaining NumberStyles members control elements that may be but are not required to be present in this input string. 下表指出個別NumberStyles成員如何影響中s可能存在的元素。The following table indicates how individual NumberStyles members affect the elements that may be present in s.

非複合 NumberStyles 值Non-composite NumberStyles values 除了數位之外,s 中允許的元素Elements permitted in s in addition to digits
NumberStyles.None 僅限十進位數。Decimal digits only.
NumberStyles.AllowDecimalPoint 小數點( .The decimal point ( . )和小數位數元素。) and fractional-digits elements. 不過,小數數位必須只包含一或多個0位數,否則OverflowException會擲回。However, fractional-digits must consist of only one or more 0 digits or an OverflowException is thrown.
NumberStyles.AllowExponent s參數也可以使用指數標記法。The s parameter can also use exponential notation.
NumberStyles.AllowLeadingWhite 開頭sws元素。The ws element at the beginning of s.
NumberStyles.AllowTrailingWhite 結尾sws元素。The ws element at the end of s.
NumberStyles.AllowLeadingSign 正負號可以出現在數位前面。A sign can appear before digits.
NumberStyles.AllowTrailingSign 正負號可以在數位之後出現。A sign can appear after digits.
NumberStyles.AllowParentheses 以括弧形式括住數值的sign元素。The sign element in the form of parentheses enclosing the numeric value.
NumberStyles.AllowThousands 千位分隔符號( )元素。The thousands separator ( , ) element.
NumberStyles.AllowCurrencySymbol $ 元素。The $ element.

s如果使用NumberStyles.AllowHexSpecifier旗標,必須是不含前置詞的十六進位值。If the NumberStyles.AllowHexSpecifier flag is used, s must be a hexadecimal value without a prefix. 例如,"C9AF3" 會成功剖析,但 "0xC9AF3" 則不會。For example, "C9AF3" parses successfully, but "0xC9AF3" does not. style唯一可以出現的其他旗標是NumberStyles.AllowLeadingWhiteNumberStyles.AllowTrailingWhiteThe only other flags that can be present in style are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (列舉具有複合數位樣式, NumberStyles.HexNumber其中同時包含空白字元旗標)。 NumberStyles(The NumberStyles enumeration has a composite number style, NumberStyles.HexNumber, that includes both white space flags.)

參數是一CultureInfoNumberFormatInfo實作為,例如或物件。 IFormatProvider providerThe provider parameter is an IFormatProvider implementation, such as a NumberFormatInfo or CultureInfo object. provider參數提供用於剖析的特定文化特性資訊。The provider parameter supplies culture-specific information used in parsing. 如果provider NumberFormatInfonull,則會使用目前文化特性的。If provider is null, the NumberFormatInfo for the current culture is used.

另請參閱

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

參數

style
NumberStyles
provider
IFormatProvider

傳回

Parse(String, NumberStyles)

將指定樣式之數字的字串表示轉換成它的對等 64 位元帶正負號的整數。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

參數

s
String

字串,包含要轉換的數字。A string containing a number to convert.

style
NumberStyles

NumberStyles 值的位元組合,表示 s 的允許格式。A bitwise combination of NumberStyles values that indicates the permitted format of s. 一般會指定的值是 IntegerA typical value to specify is Integer.

傳回

64 位元帶正負號的整數,與 s 中所指定的數字相等。A 64-bit signed integer equivalent to the number specified in s.

例外狀況

snulls is null.

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

-或--or- style 不是 AllowHexSpecifierHexNumber 值的組合。style is not a combination of AllowHexSpecifier and HexNumber values.

s 的格式與 style 不相容。s is not in a format compliant with style.

s 代表小於 MinValue 或大於 MaxValue 的數字。s represents a number less than MinValue or greater than MaxValue.

-或--or- style 支援小數數字,但 s 包含非零的小數數字。style supports fractional digits but s includes non-zero fractional digits.

範例

下列範例會使用Int64.Parse(String, NumberStyles)方法來剖析數個Int64值的字串表示。The following example uses the Int64.Parse(String, NumberStyles) method to parse the string representations of several Int64 values. 此範例的目前文化特性為 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'.

備註

參數會定義可讓剖析作業成功的s參數中所允許的樣式元素(例如空白字元、正數或負號符號,或千位分隔符號符號)。 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. 它必須是NumberStyles列舉中的位旗標組合。It must be a combination of bit flags from the NumberStyles enumeration. 視的值style s而定,參數可能包含下列元素: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包含AllowHexSpecifierOr, if style includes AllowHexSpecifier:

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

在方括號 ([ 和 ]) 中的項目是選擇性的項目。Elements in square brackets ([ and ]) are optional. 下表說明每個元素。The following table describes each element.

元素Element 說明Description
wsws 選擇性的空白字元。Optional white space. s s style NumberStyles.AllowTrailingWhite如果包含style 旗標,空白字元可能會出現在開頭,而且如果包含旗標,它可以NumberStyles.AllowLeadingWhite出現在的結尾。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.
$ 特定文化特性的貨幣符號。A culture-specific currency symbol. 其在字串中的位置是由NumberFormatInfo.CurrencyNegativePattern目前文化特性的和NumberFormatInfo.CurrencyPositivePattern屬性所定義。Its position in the string is defined by the NumberFormatInfo.CurrencyNegativePattern and NumberFormatInfo.CurrencyPositivePattern properties of the current culture. 如果s style包含旗標,則目前文化特性的貨幣符號可能會出現在中。NumberStyles.AllowCurrencySymbolThe current culture's currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag.
簽署sign 選擇性的正負號。An optional sign. s s style NumberStyles.AllowTrailingSign如果包含style 旗標,則正負號可能會出現在開頭,而且如果包含旗標,它可以NumberStyles.AllowLeadingSign出現在的結尾。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 旗標,則可以在中使用括弧來NumberStyles.AllowParentheses表示負數值。Parentheses can be used in s to indicate a negative value if style includes the NumberStyles.AllowParentheses flag.
digitsdigits

fractional_digitsfractional_digits

exponential_digitsexponential_digits
從0到9的數位序列。A sequence of digits from 0 through 9. 針對fractional_digits,只有數位0是有效的。For fractional_digits, only the digit 0 is valid.
, 文化特性特定的千位分隔符號。A culture-specific thousands separator symbol. 如果s style包含旗標,則目前文化特性的千位分隔符號可能會出現在中。NumberStyles.AllowThousandsThe current culture's thousands separator can appear in s if style includes the NumberStyles.AllowThousands flag.
.. 文化特性特定的小數點符號。A culture-specific decimal point symbol. 如果s style包含旗標,則目前文化特性的小數點符號可能會出現在中。NumberStyles.AllowDecimalPointThe current culture's decimal point symbol can appear in s if style includes the NumberStyles.AllowDecimalPoint flag. 只有數位0可以顯示為小數位數,剖析作業才會成功;如果fractional_digits包含任何其他數位, OverflowException則會擲回。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 ' 字元,表示該值是以指數標記法表示。The 'e' or 'E' character, which indicates that the value is represented in exponential notation. 如果s 包含旗NumberStyles.AllowExponent標, 參數可以表示指數標記法中的數位。 styleThe s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag.
hexdigitshexdigits 從0到 f 的十六進位數位序列, 或0到 F。A sequence of hexadecimal digits from 0 through f, or 0 through F.

注意

不論style引數的值為何, 剖析作業都會s忽略中的任何終止 NUL (U + 0000) 字元。Any terminating NUL (U+0000) characters in s are ignored by the parsing operation, regardless of the value of the style argument.

僅限數位的字串(對應至NumberStyles.None樣式)一律會在Int64類型的範圍內成功剖析。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. 大部分的其餘NumberStyles成員控制元素,這些專案可能是但不需要出現在輸入字串中。Most of the remaining NumberStyles members control elements that may be but are not required to be present in the input string. 下表指出個別NumberStyles成員如何影響中s可能存在的元素。The following table indicates how individual NumberStyles members affect the elements that may be present in s.

NumberStyles 值NumberStyles value 除了數位之外,s 中允許的元素Elements permitted in s in addition to digits
None 僅限數位元素。The digits element only.
AllowDecimalPoint 小數點( .The decimal point ( . )和小數位數元素。) and fractional-digits elements.
AllowExponent s參數也可以使用指數標記法。The s parameter can also use exponential notation. 如果s代表指數標記法中的數位,則產生的數值不能包含任何非零的小數數位。If s represents a number in exponential notation, the resulting numeric value cannot include any non-zero fractional digits.
AllowLeadingWhite 開頭sws元素。The ws element at the beginning of s.
AllowTrailingWhite 結尾sws元素。The ws element at the end of s.
AllowLeadingSign 在開頭s的 sign 元素。The sign element at the beginning of s.
AllowTrailingSign 結尾ssign元素。The sign element at the end of s.
AllowParentheses 以括弧形式括住數值的sign元素。The sign element in the form of parentheses enclosing the numeric value.
AllowThousands 千位分隔符號( )元素。The thousands separator ( , ) element.
AllowCurrencySymbol $ 元素。The $ element.
Currency 全部。All. s參數不能以指數標記法表示十六進位數位或數位。The s parameter cannot represent a hexadecimal number or a number in exponential notation.
Float 位於開頭或結尾s的 ws 元素、在開頭s正負號,以及小數點( .The ws element at the beginning or end of s, sign at the beginning of s, and the decimal point ( . 百分號.) symbol. s參數也可以使用指數標記法。The s parameter can also use exponential notation.
Number Wssign、千位分隔符號( )和小數點( .The ws, sign, thousands separator ( , ), and decimal point ( . 要素.) elements.
Any 除了以外s的所有樣式都不能代表十六進位數位。All styles, except s cannot represent a hexadecimal number.

s如果使用NumberStyles.AllowHexSpecifier旗標,必須是不含前置詞的十六進位值。If the NumberStyles.AllowHexSpecifier flag is used, s must be a hexadecimal value without a prefix. 例如,"C9AF3" 會成功剖析,但 "0xC9AF3" 則不會。For example, "C9AF3" parses successfully, but "0xC9AF3" does not. 唯一可以與s參數結合的其他旗標為NumberStyles.AllowLeadingWhiteNumberStyles.AllowTrailingWhiteThe only other flags that can be combined with the s parameter are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (列舉包含複合數位樣式, NumberStyles.HexNumber其中同時包含空白字元旗標)。 NumberStyles(The NumberStyles enumeration includes a composite number style, NumberStyles.HexNumber, that includes both white space flags.)

參數會使用針對目前系統文化特性初始化之NumberFormatInfo物件中的格式資訊來進行剖析。 sThe s parameter is parsed using the formatting information in a NumberFormatInfo object that is initialized for the current system culture. 若要指定用於剖析作業的文化特性, 其格式資訊會呼叫Int64.Parse(String, NumberStyles, IFormatProvider)多載。To specify the culture whose formatting information is used for the parse operation, call the Int64.Parse(String, NumberStyles, IFormatProvider) overload.

另請參閱

Parse(String)

將數字的字串表示轉換成它的對等 64 位元帶正負號的整數。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

參數

s
String

字串,包含要轉換的數字。A string containing a number to convert.

傳回

64 位元帶正負號的整數,與 s 中所包含的數字相等。A 64-bit signed integer equivalent to the number contained in s.

例外狀況

snulls is null.

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

s 代表小於 MinValue 或大於 MaxValue 的數字。s represents a number less than MinValue or greater than MaxValue.

範例

下列範例示範如何使用Int64.Parse(String)方法,將字串值轉換成64位帶正負號的整數值。The following example demonstrates how to convert a string value into a 64-bit signed integer value using the Int64.Parse(String) method. 然後,它會顯示產生的長整數值。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.

備註

s參數包含下列格式的數位:The s parameter contains a number of the form:

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

在方括號 ([ 和 ]) 中的項目是選擇性的項目。Elements in square brackets ([ and ]) are optional. 下表說明每個元素。The following table describes each element.

元素Element 說明Description
wsws 選擇性的空白字元。Optional white space.
Signsign 選擇性的正負號。An optional sign.
digitsdigits 範圍從0到9的數位序列。A sequence of digits ranging from 0 to 9.

s參數會NumberStyles.Integer使用樣式來加以解讀。The s parameter is interpreted using the NumberStyles.Integer style. 除了小數以外,只允許開頭和尾端空格加上前置正負號。In addition to decimal digits, only leading and trailing spaces together with a leading sign are allowed. 若要明確定義中s可以存在的樣式元素,請使用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.

參數會使用針對目前系統文化特性初始化之NumberFormatInfo物件中的格式資訊來進行剖析。 sThe s parameter is parsed using the formatting information in a NumberFormatInfo object that is initialized for the current system culture. 若要使用一些其他文化特性的格式資訊來剖析字串,請Int64.Parse(String, NumberStyles, IFormatProvider)使用方法。To parse a string using the formatting information of some other culture, use the Int64.Parse(String, NumberStyles, IFormatProvider) method.

另請參閱

Parse(String, IFormatProvider)

將指定特定文化特性格式之數字的字串表示轉換成它的對等 64 位元帶正負號的整數。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

參數

s
String

字串,包含要轉換的數字。A string containing a number to convert.

provider
IFormatProvider

物件,提供關於 s 的特定文化特性格式資訊。An object that supplies culture-specific formatting information about s.

傳回

64 位元帶正負號的整數,與 s 中所指定的數字相等。A 64-bit signed integer equivalent to the number specified in s.

例外狀況

snulls is null.

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

s 代表小於 MinValue 或大於 MaxValue 的數字。s represents a number less than MinValue or greater than MaxValue.

範例

下列範例是 Web 表單的按鈕 click 事件處理常式。The following example is the button click event handler of a Web form. 它會使用HttpRequest.UserLanguages屬性所傳回的陣列來判斷使用者的地區設定。It uses the array returned by the HttpRequest.UserLanguages property to determine the user's locale. 接著,它會CultureInfo具現化對應至該地區設定的物件。It then instantiates a CultureInfo object that corresponds to that locale. 然後,屬於該CultureInfo物件的Parse(String, IFormatProvider) Int64物件會傳遞至方法,以將使用者的輸入轉換成值。 NumberFormatInfoThe 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

備註

此方法的多載通常用來將可以各種方式Int64格式化的文字轉換成值。 Parse(String, IFormatProvider)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,它可以用來將使用者輸入的文字轉換成 HTML 文字方塊中的數位值。For example, it can be used to convert the text entered by a user into an HTML text box to a numeric value.

s參數包含下列格式的數位:The s parameter contains a number of the form:

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

方括弧([和])中的專案是選擇性的,而其他專案則如下所示。Items in square brackets ([ and ]) are optional, and other items are as follows.

wsws
選擇性的空白字元。An optional white space.

Signsign
選擇性的正負號。An optional sign.

digitsdigits
範圍從0到9的數位序列。A sequence of digits ranging from 0 to 9.

s參數會NumberStyles.Integer使用樣式來加以解讀。The s parameter is interpreted using the NumberStyles.Integer style. 除了小數以外,只允許開頭和尾端空格加上前置正負號。In addition to decimal digits, only leading and trailing spaces together with a leading sign are allowed. 若要明確定義中s可以存在的樣式元素,請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.

參數是一CultureInfoNumberFormatInfo實作為,例如或物件。 IFormatProvider providerThe provider parameter is an IFormatProvider implementation, such as a NumberFormatInfo or CultureInfo object. 參數提供有關格式的s特定文化特性資訊。 providerThe provider parameter supplies culture-specific information about the format of s. 如果provider NumberFormatInfonull,則會使用目前文化特性的。If provider is null, the NumberFormatInfo for the current culture is used.

另請參閱

適用於