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)

將數字的範圍表示 (使用指定樣式和特定文化特性格式) 轉換為其對等 64 位元帶正負號的整數。Converts the span representation of a number in a specified style and culture-specific format to its 64-bit signed integer equivalent.

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);
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

Int64

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 參數來剖析值的字串表示 Int64The 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法,可以根據用於剖析作業的格式資訊,來解讀相同字串的文化特性。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

style參數會定義 (的樣式元素,例如空白字元或可在參數中允許的正負號) ,以便 s 讓剖析作業成功。The 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. 它必須是來自列舉的位旗標組合 NumberStylesIt must be a combination of bit flags from the NumberStyles enumeration. 視的值而定 styles 參數可能包含下列元素:Depending on the value of style, the s parameter may include the following elements:

atl-ws-01[$]申請[數位,] 位數 [.fractional_digits] [e [sign] exponential_digits] [ws][ws][$][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 描述Description
wsws 選擇性的空白字元。Optional white space. 如果包含旗標,則空格開頭可能會出現空格 s style NumberStyles.AllowLeadingWhites 如果 style 包含旗標,則會出現在結尾 NumberStyles.AllowTrailingWhiteWhite 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. 它在字串中的位置是由 NumberFormatInfo.CurrencyPositivePattern 參數方法所傳回之物件的屬性所定義 NumberFormatInfo GetFormat providerIts position in the string is defined by the NumberFormatInfo.CurrencyPositivePattern property of the NumberFormatInfo object returned by the GetFormat method of the provider parameter. s如果包含旗標,貨幣符號可以出現在中 style 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. 如果包含旗標,則符號會出現在的開頭,如果包含旗標,則會出現在 s style NumberStyles.AllowLeadingSign 結尾 s style NumberStyles.AllowTrailingSignThe 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. 您可以在中使用括弧 s 來表示如果包含旗標,則為負數值 style NumberStyles.AllowParenthesesParentheses can be used in s to indicate a negative value if style includes the NumberStyles.AllowParentheses flag.
數字digits

fractional_digitsfractional_digits

exponential_digitsexponential_digits
從0到9的數位序列。A sequence of digits from 0 through 9.
,, 特定文化特性的千位分隔符號。A culture-specific thousands separator symbol. 如果包含旗標,則所指定之文化特性的千位分隔符號 provider 可以出現在中 s style NumberStyles.AllowThousandsThe 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. 如果包含旗標,則所指定之文化特性的小數點符號 provider 可以出現在中 s style NumberStyles.AllowDecimalPointThe 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.
pci-ee 「E」或「E」字元,表示值以指數標記法表示。The 'e' or 'E' character, which indicates that the value is represented in exponential notation. s如果包含旗標,則參數可以表示指數標記法中的數位 style NumberStyles.AllowExponentThe s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag.
hexdigitshexdigits 從0到 f,或從0到 F 的十六進位數位序列。A sequence of hexadecimal digits from 0 through f, or 0 through F.

注意

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

僅含小數位數的字串, (對應于 NumberStyles.None 樣式的) 如果是在類型的範圍內,則一律會成功剖析 Int64A 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. 大部分其餘的 NumberStyles 成員會控制可能存在但不需要出現在此輸入字串中的元素。Most of the remaining NumberStyles members control elements that may be but are not required to be present in this input string. 下表指出個別成員如何 NumberStyles 影響可能存在的元素 sThe 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,還允許的元素Elements permitted in s in addition to digits
NumberStyles.None 僅限小數數位。Decimal digits only.
NumberStyles.AllowDecimalPoint 小數點 ( The decimal point ( . ) 和 小數數位 元素。) and fractional-digits elements. 不過, 小數位數 必須只包含一或多個0位數,否則會擲回 OverflowExceptionHowever, 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 開頭的 ws 元素 sThe ws element at the beginning of s.
NumberStyles.AllowTrailingWhite 結尾的 ws 元素 sThe ws element at the end of s.
NumberStyles.AllowLeadingSign 符號可以出現在 數位 之前。A sign can appear before digits.
NumberStyles.AllowTrailingSign 符號可以出現在 數位 之後。A sign can appear after digits.
NumberStyles.AllowParentheses 以括弧括住數值的 符號 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.

如果 NumberStyles.AllowHexSpecifier 使用旗標,則 s 必須是沒有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" 則否。For example, "C9AF3" parses successfully, but "0xC9AF3" does not. 中唯一可以存在的其他旗標 styleNumberStyles.AllowLeadingWhiteNumberStyles.AllowTrailingWhiteThe only other flags that can be present in style are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (NumberStyles 列舉具有 NumberStyles.HexNumber 包含空白字元旗標的複合數位樣式。 ) (The NumberStyles enumeration has a composite number style, NumberStyles.HexNumber, that includes both white space flags.)

provider參數是 IFormatProvider 實作為,例如 NumberFormatInfoCultureInfo 物件。The provider parameter is an IFormatProvider implementation, such as a NumberFormatInfo or CultureInfo object. provider參數提供剖析時使用的特定文化特性資訊。The provider parameter supplies culture-specific information used in parsing. 如果 providernull ,則 NumberFormatInfo 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

Parse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider)

將數字的範圍表示 (使用指定樣式和特定文化特性格式) 轉換為其對等 64 位元帶正負號的整數。Converts the span representation of a number in a specified style and culture-specific format to its 64-bit signed integer equivalent.

public static long Parse (ReadOnlySpan<char> s, System.Globalization.NumberStyles style = System.Globalization.NumberStyles.Integer, IFormatProvider? provider = default);
public static long Parse (ReadOnlySpan<char> s, System.Globalization.NumberStyles style = System.Globalization.NumberStyles.Integer, IFormatProvider provider = default);
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 = Nothing) As Long

參數

s
ReadOnlySpan<Char>

範圍,其包含代表所要轉換數字的字元。A span containing the characters representing the 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

Int64

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.

適用於

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

Int64

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) 方法來剖析數個值的字串表示 Int64The following example uses the Int64.Parse(String, NumberStyles) method to parse the string representations of several Int64 values. 此範例目前的文化特性為 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

style參數會定義 (的樣式元素,例如空白字元、正號或負號或負號的符號,或可在參數中允許的千位分隔符號符號) , s 讓剖析作業成功。The 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. 它必須是來自列舉的位旗標組合 NumberStylesIt must be a combination of bit flags from the NumberStyles enumeration. 視的值而定 styles 參數可能包含下列元素:Depending on the value of style, the s parameter may contain the following elements:

atl-ws-01[$]申請[數位,] 位數 [.fractional_digits] [e [sign] exponential_digits] [ws][ws][$][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 描述Description
wsws 選擇性的空白字元。Optional white space. 如果包含旗標,則空格開頭可能會出現空格 s style NumberStyles.AllowLeadingWhites 如果 style 包含旗標,則會出現在結尾 NumberStyles.AllowTrailingWhiteWhite 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 NumberFormatInfo.CurrencyPositivePattern 目前文化特性的和屬性所定義。Its position in the string is defined by the NumberFormatInfo.CurrencyNegativePattern and NumberFormatInfo.CurrencyPositivePattern properties of the current culture. s如果包含旗標,則目前文化特性的貨幣符號可以出現在中 style 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. 如果包含旗標,符號可以出現在的開頭, s style NumberStyles.AllowLeadingSign s 如果包含旗標,則會出現在結尾 style NumberStyles.AllowTrailingSignThe 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. 您可以在中使用括弧 s 來表示如果包含旗標,則為負數值 style NumberStyles.AllowParenthesesParentheses can be used in s to indicate a negative value if style includes the NumberStyles.AllowParentheses flag.
數字digits

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.
,, 特定文化特性的千位分隔符號。A culture-specific thousands separator symbol. s如果包含旗標,則目前文化特性的千位分隔符號可以出現在中 style 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. s如果包含旗標,則目前文化特性的小數點符號可以出現在中 style 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.
pci-ee 「E」或「E」字元,表示值以指數標記法表示。The 'e' or 'E' character, which indicates that the value is represented in exponential notation. s如果包含旗標,則參數可以表示指數標記法中的數位 style NumberStyles.AllowExponentThe s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag.
hexdigitshexdigits 從0到 f,或從0到 F 的十六進位數位序列。A sequence of hexadecimal digits from 0 through f, or 0 through F.

注意

s無論引數的值為何,剖析作業都會忽略中的任何終止 NUL (U + 0000) 字元 styleAny 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,其會對應至 NumberStyles.None 樣式) 如果是在類型的範圍內,則一律會成功剖析 Int64A string with digits only (which corresponds to the NumberStyles.None style) always parses successfully if it is in the range of the Int64 type. 大部分其餘的 NumberStyles 成員會控制可能存在但不需要出現在輸入字串中的元素。Most of the remaining NumberStyles members control elements that may be but are not required to be present in the input string. 下表指出個別成員如何 NumberStyles 影響可能存在的元素 sThe 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,還允許的元素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 小數數位 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 以指數標記法表示數位,則產生的數位值不能包含任何非零的小數位數。If s represents a number in exponential notation, the resulting numeric value cannot include any non-zero fractional digits.
AllowLeadingWhite 開頭的 ws 元素 sThe ws element at the beginning of s.
AllowTrailingWhite 結尾的 ws 元素 sThe ws element at the end of s.
AllowLeadingSign 開頭的 sign 元素 sThe sign element at the beginning of s.
AllowTrailingSign 結尾的 sign 元素 sThe sign element at the end of s.
AllowParentheses 以括弧括住數值的 符號 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 All:All. s參數不能代表十六進位數位或數位(以指數標記法表示)。The s parameter cannot represent a hexadecimal number or a number in exponential notation.
Float 在開頭或結尾的 ws 元素 s符號 開頭 s 和小數點 ( The ws element at the beginning or end of s, sign at the beginning of s, and the decimal point ( . ) 符號。) symbol. s參數也可以使用指數標記法。The s parameter can also use exponential notation.
Number Ws正負號 、千位分隔符號 ( ) 和小數點 ( The ws , sign , thousands separator ( , ), and decimal point ( . ) 元素。) elements.
Any 除了以外的所有樣式,都 s 不能代表十六進位數位。All styles, except s cannot represent a hexadecimal number.

如果 NumberStyles.AllowHexSpecifier 使用旗標,則 s 必須是沒有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" 則否。For example, "C9AF3" parses successfully, but "0xC9AF3" does not. 唯一可與參數結合的其他旗標 sNumberStyles.AllowLeadingWhiteNumberStyles.AllowTrailingWhiteThe only other flags that can be combined with the s parameter are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (NumberStyles 列舉包含 NumberStyles.HexNumber 包含空白字元旗標的複合數位樣式。 ) (The NumberStyles enumeration includes a composite number style, NumberStyles.HexNumber, that includes both white space flags.)

s參數會使用 NumberFormatInfo 針對目前系統文化特性初始化之物件中的格式資訊進行剖析。The 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之格式化資訊的文化特性,請呼叫多載 Int64.Parse(String, NumberStyles, IFormatProvider)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

適用於

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

Int64

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方法,將字串值轉換為64位帶正負號的整數值 Int64.Parse(String)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目:The s parameter contains a number of the form:

atl-ws-01[sign] 位數 [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 描述Description
wsws 選擇性的空白字元。Optional white space.
簽署sign 選擇性的正負號。An optional sign.
數字digits 範圍從0到9的數位序列。A sequence of digits ranging from 0 to 9.

s使用樣式來解讀參數 NumberStyles.IntegerThe s parameter is interpreted using the NumberStyles.Integer style. 除了十進位數以外,只允許前置和尾端空格搭配前置正負號。In addition to decimal digits, only leading and trailing spaces together with a leading sign are allowed. 若要明確定義可以出現在中的樣式元素 s ,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.

s參數會使用 NumberFormatInfo 針對目前系統文化特性初始化之物件中的格式資訊進行剖析。The s parameter is parsed using the formatting information in a NumberFormatInfo object that is initialized for the current system culture. 若要使用其他文化特性的格式資訊來剖析字串,請使用 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.

另請參閱

適用於

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

傳回

Int64

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. 它會使用屬性所傳回的陣列 HttpRequest.UserLanguages 來決定使用者的地區設定。It uses the array returned by the HttpRequest.UserLanguages property to determine the user's locale. 然後具現化 CultureInfo 對應至該地區設定的物件。It then instantiates a CultureInfo object that corresponds to that locale. NumberFormatInfo然後,會將屬於該 CultureInfo 物件的物件傳遞至 Parse(String, IFormatProvider) 方法,以將使用者的輸入轉換成 Int64 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

備註

方法的這個多載 Parse(String, IFormatProvider) 通常用來轉換可以各種方式格式化為值的文字 Int64This 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目:The s parameter contains a number of the form:

atl-ws-01[sign] 位數 [ws][ws][sign]digits[ws]

以方括弧括住的專案 ( [和] ) 是選擇性的,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.

簽署sign
選擇性的正負號。An optional sign.

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

s使用樣式來解讀參數 NumberStyles.IntegerThe s parameter is interpreted using the NumberStyles.Integer style. 除了十進位數以外,只允許前置和尾端空格搭配前置正負號。In addition to decimal digits, only leading and trailing spaces together with a leading sign are allowed. 若要明確定義可以出現在中的樣式元素 s ,請使用 Int64.Parse(String, NumberStyles, IFormatProvider) 方法。To explicitly define the style elements that can be present in s, use the Int64.Parse(String, NumberStyles, IFormatProvider) method.

provider參數是 IFormatProvider 實作為,例如 NumberFormatInfoCultureInfo 物件。The provider parameter is an IFormatProvider implementation, such as a NumberFormatInfo or CultureInfo object. provider參數提供有關格式的文化特性特定資訊 sThe provider parameter supplies culture-specific information about the format of s. 如果 providernull ,則 NumberFormatInfo 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