Int32.TryParse 方法

定義

將數字的字串表示轉換成它的對等 32 位元帶正負號的整數。Converts the string representation of a number to its 32-bit signed integer equivalent. 傳回指示作業是否成功的值。A return value indicates whether the operation succeeded.

多載

TryParse(String, Int32)

將數字的字串表示轉換成它的對等 32 位元帶正負號的整數。Converts the string representation of a number to its 32-bit signed integer equivalent. 傳回指示轉換是否成功的值。A return value indicates whether the conversion succeeded.

TryParse(ReadOnlySpan<Char>, Int32)

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 32 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 32-bit signed integer equivalent. 傳回指示轉換是否成功的值。A return value indicates whether the conversion succeeded.

TryParse(String, NumberStyles, IFormatProvider, Int32)

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 32 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 32-bit signed integer equivalent. 傳回指示轉換是否成功的值。A return value indicates whether the conversion succeeded.

TryParse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider, Int32)

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 32 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 32-bit signed integer equivalent. 傳回指示轉換是否成功的值。A return value indicates whether the conversion succeeded.

TryParse(String, Int32)

將數字的字串表示轉換成它的對等 32 位元帶正負號的整數。Converts the string representation of a number to its 32-bit signed integer equivalent. 傳回指示轉換是否成功的值。A return value indicates whether the conversion succeeded.

public:
 static bool TryParse(System::String ^ s, [Runtime::InteropServices::Out] int % result);
public static bool TryParse (string s, out int result);
static member TryParse : string * int -> bool
Public Shared Function TryParse (s As String, ByRef result As Integer) As Boolean

參數

s
String

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

result
Int32

如果轉換成功,這個方法會傳回包含與 s 中內含數字相等的 32 位元帶正負號整數,如果轉換失敗則為零。When this method returns, contains the 32-bit signed integer value equivalent of the number contained in s, if the conversion succeeded, or zero if the conversion failed. 如果 s 參數為 nullEmpty、不是正確的格式,或是表示小於 MinValue 或大於 MaxValue 的數字,則轉換會失敗。The conversion fails if the s parameter is null or Empty, is not of the correct format, or represents a number less than MinValue or greater than MaxValue. 這個參數未初始化便傳遞,result 中原始提供的任何值都將遭到覆寫。This parameter is passed uninitialized; any value originally supplied in result will be overwritten.

傳回

如果 true 轉換成功,則為 s,否則為 falsetrue if s was converted successfully; otherwise, false.

範例

下列範例會使用數個不同的字串值來呼叫 Int32.TryParse(String, Int32) 方法。The following example calls the Int32.TryParse(String, Int32) method with a number of different string values.

using namespace System;


   void TryToParse(String^ value)
   {
      Int32 number;
      bool result = Int32::TryParse(value, number);
      if (result) {
         Console::WriteLine("Converted '{0}' to {1}.", value, number);
      }
      else {
         if (value == nullptr) value = "";
         Console::WriteLine("Attempted conversion of '{0}' failed.", value);
      }
   }


void main()
{
      TryToParse(nullptr);
      TryToParse("160519");
      TryToParse("9432.0");
      TryToParse("16,667");
      TryToParse("   -322   ");
      TryToParse("+4302");
      TryToParse("(100);");
      TryToParse("01FA");
}
// The example displays the following output:
//      Attempted conversion of '' failed.
//      Converted '160519' to 160519.
//      Attempted conversion of '9432.0' failed.
//      Attempted conversion of '16,667' failed.
//      Converted '   -322   ' to -322.
//      Converted '+4302' to 4302.
//      Attempted conversion of '(100);' failed.
//      Attempted conversion of '01FA' failed.
using System;

public class Example
{
   public static void Main()
   {
      String[] values = { null, "160519", "9432.0", "16,667",
                          "   -322   ", "+4302", "(100);", "01FA" };
      foreach (var value in values) 
      {
         int number;
   
         bool success = Int32.TryParse(value, out number);
         if (success)
         {
            Console.WriteLine("Converted '{0}' to {1}.", value, number);         
         }
         else
         {
            Console.WriteLine("Attempted conversion of '{0}' failed.", 
                               value ?? "<null>");
         }
      }
   }
}
// The example displays the following output:
//       Attempted conversion of '<null>' failed.
//       Converted '160519' to 160519.
//       Attempted conversion of '9432.0' failed.
//       Attempted conversion of '16,667' failed.
//       Converted '   -322   ' to -322.
//       Converted '+4302' to 4302.
//       Attempted conversion of '(100);' failed.
//       Attempted conversion of '01FA' failed.
Module Example
   Public Sub Main()
      Dim values() As String = { Nothing, "160519", "9432.0", "16,667",
                                 "   -322   ", "+4302", "(100);", 
                                 "01FA" }

      For Each value In values
         Dim number As Integer
    
         Dim success As Boolean = Int32.TryParse(value, number)
         If success Then
            Console.WriteLine("Converted '{0}' to {1}.", value, number)
         Else
            Console.WriteLine("Attempted conversion of '{0}' failed.", 
                              If(value ,"<null>"))
         End If     
      Next
   End Sub
End Module
' The example displays the following output to the console:
'       Attempted conversion of '<null>' failed.
'       Converted '160519' to 160519.
'       Attempted conversion of '9432.0' failed.
'       Attempted conversion of '16,667' failed.
'       Converted '   -322   ' to -322.
'       Converted '+4302' to 4302.
'       Attempted conversion of '(100)' failed.
'       Attempted conversion of '01FA' failed.

在此範例中,TryParse(String, Int32) 方法無法轉換的某些字串包括:Some of the strings that the TryParse(String, Int32) method is unable to convert in this example are:

  • "9432.0"."9432.0". 轉換失敗,因為字串不能包含小數分隔符號。它必須只包含整數數位。The conversion fails because the string cannot contain a decimal separator; it must contain integral digits only.

  • "16,667"."16,667". 轉換失敗,因為字串不能包含群組分隔符號;它必須只包含整數數位。The conversion fails because the string cannot contain group separators; it must contain integral digits only.

  • "(100)"."(100)". 轉換失敗的原因是,字串不能包含目前文化特性的 NumberFormatInfo.NegativeSignNumberFormatInfo.NumberNegativePattern 屬性所定義的負號。The conversion fails because the string cannot contain a negative sign other than the one defined by the current culture's NumberFormatInfo.NegativeSign and NumberFormatInfo.NumberNegativePattern properties.

  • "01FA"."01FA". 轉換失敗,因為字串不能包含十六進位數位。只能包含小數位數。The conversion fails because the string cannot contain hexadecimal digits; it must contain decimal digits only.

備註

TryParse 方法與 Parse 方法類似,但在轉換失敗時,TryParse 方法不會擲回例外狀況。The TryParse method is like the Parse method, except the TryParse method does not throw an exception if the conversion fails. 如果 s 無效,而且無法成功剖析,就不需要使用例外狀況處理來測試 FormatExceptionIt eliminates the need to use exception handling to test for a FormatException in the event that s is invalid and cannot be successfully parsed.

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

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

以方括弧([和])括住的專案是選擇性的。Items in square brackets ([ and ]) are optional. 下表說明每個元素。The following table describes each element.

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

s 參數會使用 NumberStyles.Integer 樣式來加以解讀。The s parameter is interpreted using the NumberStyles.Integer style. 除了十進位數以外,只允許開頭和尾端空格加上前置正負號。In addition to the decimal digits, only leading and trailing spaces together with a leading sign are allowed. 若要明確定義樣式專案,以及可在 s中顯示的特定文化特性格式資訊,請使用 Int32.TryParse(String, NumberStyles, IFormatProvider, Int32) 方法。To explicitly define the style elements together with the culture-specific formatting information that can be present in s, use the Int32.TryParse(String, NumberStyles, IFormatProvider, Int32) method.

s 參數會使用針對目前系統文化特性初始化的 NumberFormatInfo 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 initialized for the current system culture. 如需詳細資訊,請參閱CurrentInfoFor more information, see CurrentInfo.

TryParse 方法的這個多載會將 s 參數中的所有數位都轉譯為十進位數。This overload of the TryParse method interprets all digits in the s parameter as decimal digits. 若要剖析十六進位數位的字串表示,請呼叫 Int32.TryParse(String, NumberStyles, IFormatProvider, Int32) 多載。To parse the string representation of a hexadecimal number, call the Int32.TryParse(String, NumberStyles, IFormatProvider, Int32) overload.

另請參閱

TryParse(ReadOnlySpan<Char>, Int32)

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 32 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 32-bit signed integer equivalent. 傳回指示轉換是否成功的值。A return value indicates whether the conversion succeeded.

public:
 static bool TryParse(ReadOnlySpan<char> s, [Runtime::InteropServices::Out] int % result);
public static bool TryParse (ReadOnlySpan<char> s, out int result);
static member TryParse : ReadOnlySpan<char> * int -> bool
Public Shared Function TryParse (s As ReadOnlySpan(Of Char), ByRef result As Integer) As Boolean

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 that represent the number to convert.

result
Int32

如果轉換成功,這個方法會傳回包含與 s 中內含數字相等的 32 位元帶正負號整數,如果轉換失敗則為零。When this method returns, contains the 32-bit signed integer value equivalent of the number contained in s, if the conversion succeeded, or zero if the conversion failed. 轉換失敗的狀況包括:如果 s 參數為 nullEmpty、格式與 style 不相容,或是表示小於 MinValue 或大於 MaxValue 的數字。The conversion fails if the s parameter is null or Empty, is not in a format compliant with style, or represents a number less than MinValue or greater than MaxValue. 這個參數未初始化便傳遞,result 中原始提供的任何值都將遭到覆寫。This parameter is passed uninitialized; any value originally supplied in result will be overwritten.

傳回

如果 true 轉換成功,則為 s,否則為 falsetrue if s was converted successfully; otherwise, false.

TryParse(String, NumberStyles, IFormatProvider, Int32)

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 32 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 32-bit signed integer equivalent. 傳回指示轉換是否成功的值。A return value indicates whether the conversion succeeded.

public:
 static bool TryParse(System::String ^ s, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] int % result);
public static bool TryParse (string s, System.Globalization.NumberStyles style, IFormatProvider provider, out int result);
static member TryParse : string * System.Globalization.NumberStyles * IFormatProvider * int -> bool
Public Shared Function TryParse (s As String, style As NumberStyles, provider As IFormatProvider, ByRef result As Integer) As Boolean

參數

s
String

字串,包含要轉換的數字。A string containing a number to convert. 這個字串使用 style 指定的樣式來解譯。The string is interpreted using the style specified by style.

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

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.

result
Int32

如果轉換成功,這個方法會傳回包含與 s 中內含數字相等的 32 位元帶正負號整數,如果轉換失敗則為零。When this method returns, contains the 32-bit signed integer value equivalent of the number contained in s, if the conversion succeeded, or zero if the conversion failed. 轉換失敗的狀況包括:如果 s 參數為 nullEmpty、格式與 style 不相容,或是表示小於 MinValue 或大於 MaxValue 的數字。The conversion fails if the s parameter is null or Empty, is not in a format compliant with style, or represents a number less than MinValue or greater than MaxValue. 這個參數未初始化便傳遞,result 中原始提供的任何值都將遭到覆寫。This parameter is passed uninitialized; any value originally supplied in result will be overwritten.

傳回

如果 true 轉換成功,則為 s,否則為 falsetrue if s was converted successfully; otherwise, false.

例外狀況

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.

範例

下列範例會使用數個不同的字串和 NumberStyles 值來呼叫 Int32.TryParse(String, NumberStyles, IFormatProvider, Int32) 方法。The following example calls the Int32.TryParse(String, NumberStyles, IFormatProvider, Int32) method with a number of different string and NumberStyles values.

using namespace System;
using namespace System::Globalization;

void CallTryParse(String^ stringToConvert, NumberStyles styles)
{
      Int32 number;
      CultureInfo^ provider;

      // If currency symbol is allowed, use en-US culture. 
      if (((Int32) (styles & NumberStyles::AllowCurrencySymbol)) > 0)
         provider = gcnew CultureInfo("en-US");
      else
         provider = CultureInfo::InvariantCulture;

      bool result = Int32::TryParse(stringToConvert, styles, 
                                   provider, number);
      if (result)
         Console::WriteLine("Converted '{0}' to {1}.", stringToConvert, number);
      else
         Console::WriteLine("Attempted conversion of '{0}' failed.", 
                           Convert::ToString(stringToConvert));
}

void main()
{
      String^ numericString;
      NumberStyles styles;

      numericString = "106779";
      styles = NumberStyles::Integer;
      CallTryParse(numericString, styles);

      numericString = "-30677";
      styles = NumberStyles::None;
      CallTryParse(numericString, styles);

      styles = NumberStyles::AllowLeadingSign;
      CallTryParse(numericString, styles);

      numericString = "301677-";
      CallTryParse(numericString, styles);

      styles = styles | NumberStyles::AllowTrailingSign;
      CallTryParse(numericString, styles);

      numericString = "$10634";
      styles = NumberStyles::Integer;
      CallTryParse(numericString, styles);

      styles = NumberStyles::Integer | NumberStyles::AllowCurrencySymbol;
      CallTryParse(numericString, styles);

      numericString = "10345.00";
      styles = NumberStyles::Integer | NumberStyles::AllowDecimalPoint;
      CallTryParse(numericString, styles);

      numericString = "10345.72";
      styles = NumberStyles::Integer | NumberStyles::AllowDecimalPoint;
      CallTryParse(numericString, styles);

      numericString = "22,593"; 
      styles = NumberStyles::Integer | NumberStyles::AllowThousands;
      CallTryParse(numericString, styles);

      numericString = "12E-01";
      styles = NumberStyles::Integer | NumberStyles::AllowExponent;
      CallTryParse(numericString, styles); 

      numericString = "12E03";
      CallTryParse(numericString, styles); 

      numericString = "80c1";
      CallTryParse(numericString, NumberStyles::HexNumber);

      numericString = "0x80C1";
      CallTryParse(numericString, NumberStyles::HexNumber);      
      Console::ReadLine();
}
// The example displays the following output:
//      Converted '106779' to 106779.
//      Attempted conversion of '-30677' failed.
//      Converted '-30677' to -30677.
//      Attempted conversion of '301677-' failed.
//      Converted '301677-' to -301677.
//      Attempted conversion of '$10634' failed.
//      Converted '$10634' to 10634.
//      Converted '10345.00' to 10345.
//      Attempted conversion of '10345.72' failed.
//      Converted '22,593' to 22593.
//      Attempted conversion of '12E-01' failed.
//      Converted '12E03' to 12000.
//      Converted '80c1' to 32961.
//      Attempted conversion of '0x80C1' failed.
using System;
using System.Globalization;

public class StringParsing
{
   public static void Main()
   {
      string numericString;
      NumberStyles styles;
      
      numericString = "106779";
      styles = NumberStyles.Integer;
      CallTryParse(numericString, styles);

      numericString = "-30677";
      styles = NumberStyles.None;
      CallTryParse(numericString, styles);
      
      styles = NumberStyles.AllowLeadingSign;
      CallTryParse(numericString, styles);
      
      numericString = "301677-";
      CallTryParse(numericString, styles);
      
      styles = styles | NumberStyles.AllowTrailingSign;
      CallTryParse(numericString, styles);
      
      numericString = "$10634";
      styles = NumberStyles.Integer;
      CallTryParse(numericString, styles);
      
      styles = NumberStyles.Integer | NumberStyles.AllowCurrencySymbol;
      CallTryParse(numericString, styles);
      
      numericString = "10345.00";
      styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
      CallTryParse(numericString, styles);
      
      numericString = "10345.72";
      styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
      CallTryParse(numericString, styles);

      numericString = "22,593"; 
      styles = NumberStyles.Integer | NumberStyles.AllowThousands;
      CallTryParse(numericString, styles);
      
      numericString = "12E-01";
      styles = NumberStyles.Integer | NumberStyles.AllowExponent;
      CallTryParse(numericString, styles); 
          
      numericString = "12E03";
      CallTryParse(numericString, styles); 
      
      numericString = "80c1";
      CallTryParse(numericString, NumberStyles.HexNumber);
      
      numericString = "0x80C1";
      CallTryParse(numericString, NumberStyles.HexNumber);      
   }

   private static void CallTryParse(string stringToConvert, NumberStyles styles)
   {
      CultureInfo provider;
      
      // If currency symbol is allowed, use en-US culture.
      if ((styles & NumberStyles.AllowCurrencySymbol) > 0)
         provider = new CultureInfo("en-US");
      else
         provider = CultureInfo.InvariantCulture;
            
      bool success = Int32.TryParse(stringToConvert, styles, 
                                   provider, out int number);
      if (success)
         Console.WriteLine("Converted '{0}' to {1}.", stringToConvert, number);
      else
         Console.WriteLine("Attempted conversion of '{0}' failed.", 
                           Convert.ToString(stringToConvert));
   }
}
// The example displays the following output to the console:
//       Converted '106779' to 106779.
//       Attempted conversion of '-30677' failed.
//       Converted '-30677' to -30677.
//       Attempted conversion of '301677-' failed.
//       Converted '301677-' to -301677.
//       Attempted conversion of '$10634' failed.
//       Converted '$10634' to 10634.
//       Converted '10345.00' to 10345.
//       Attempted conversion of '10345.72' failed.
//       Converted '22,593' to 22593.
//       Attempted conversion of '12E-01' failed.
//       Converted '12E03' to 12000.
//       Converted '80c1' to 32961.
//       Attempted conversion of '0x80C1' failed.
Imports System.Globalization

Module StringParsing
   Public Sub Main()
      Dim numericString As String
      Dim styles As NumberStyles
      
      numericString = "106779"
      styles = NumberStyles.Integer
      CallTryParse(numericString, styles)
      
      numericString = "-30677"
      styles = NumberStyles.None
      CallTryParse(numericString, styles)
      
      styles = NumberStyles.AllowLeadingSign
      CallTryParse(numericString, styles)
      
      numericString = "301677-"
      CallTryParse(numericString, styles)
      
      styles = styles Or NumberStyles.AllowTrailingSign
      CallTryParse(numericString, styles)
      
      numericString = "$10634"
      styles = NumberStyles.Integer
      CallTryParse(numericString, styles)
      
      styles = NumberStyles.Integer Or NumberStyles.AllowCurrencySymbol
      CallTryParse(numericString, styles)

      numericString = "10345.00"
      styles = NumberStyles.Integer Or NumberStyles.AllowDecimalPoint
      CallTryParse(numericString, styles)
      
      numericString = "10345.72"
      styles = NumberStyles.Integer Or NumberStyles.AllowDecimalPoint
      CallTryParse(numericString, styles)

      numericString = "22,593" 
      styles = NumberStyles.Integer Or NumberStyles.AllowThousands
      CallTryParse(numericString, styles)
      
      numericString = "12E-01"
      styles = NumberStyles.Integer Or NumberStyles.AllowExponent
      CallTryParse(numericString, styles) 
          
      numericString = "12E03"
      CallTryParse(numericString, styles) 
      
      numericString = "80c1"
      CallTryParse(numericString, NumberStyles.HexNumber)
      
      numericString = "0x80C1"
      CallTryParse(numericString, NumberStyles.HexNumber)
   End Sub
   
   Private Sub CallTryParse(stringToConvert As String, styles AS NumberStyles)
      Dim number As Integer
      Dim provider As CultureInfo
      
      ' If currency symbol is allowed, use en-US culture.
      If CBool(styles And NumberStyles.AllowCurrencySymbol) Then
         provider = CultureInfo.CurrentCulture
      Else
         provider = New CultureInfo("en-US")
      End If
      
      Dim result As Boolean = Int32.TryParse(stringToConvert, styles, _
                                             provider, number)
      If result Then
         Console.WriteLine("Converted '{0}' to {1}.", stringToConvert, number)
      Else
         Console.WriteLine("Attempted conversion of '{0}' failed.", _
                           Convert.ToString(stringToConvert))
      End If                                                                           
   End Sub
End Module
' The example displays the following output to the console:
'       Converted '106779' to 106779.
'       Attempted conversion of '-30677' failed.
'       Converted '-30677' to -30677.
'       Attempted conversion of '301677-' failed.
'       Converted '301677-' to -301677.
'       Attempted conversion of '$10634' failed.
'       Converted '$10634' to 10634.
'       Converted '10345.00' to 10345.
'       Attempted conversion of '10345.72' failed.
'       Converted '22,593' to 22593.
'       Attempted conversion of '12E-01' failed.
'       Converted '12E03' to 12000.
'       Converted '80c1' to 32961.
'       Attempted conversion of '0x80C1' failed.

備註

TryParse 方法與 Parse 方法類似,但在轉換失敗時,TryParse 方法不會擲回例外狀況。The TryParse method is like the Parse method, except the TryParse method does not throw an exception if the conversion fails. 如果 s 無效,而且無法成功剖析,就不需要使用例外狀況處理來測試 FormatExceptionIt eliminates the need to use exception handling to test for a FormatException in the event that s is invalid and cannot be parsed successfully.

style 參數會定義在 s 參數中允許的樣式元素(例如空白字元或正數或負號),使剖析作業成功。The style parameter defines the style elements (such as white space or a positive or negative sign) that are allowed in the s parameter for the parse operation to succeed. 它必須是來自 NumberStyles 列舉的位旗標組合。It must be a combination of bit flags from the NumberStyles enumeration. 根據 style的值,s 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[$]簽訂[數位,] 數位 [. fractional_digits] [e [sign] 數位] [ws][ws][$][sign][digits,]digits[.fractional_digits][e[sign]digits][ws]

或者,如果 style 參數包含 AllowHexSpecifierOr, if the style parameter includes AllowHexSpecifier:

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

以方括弧([和])括住的專案是選擇性的。Items in square brackets ([ and ]) are optional. 下表說明每個元素。The following table describes each element.

項目Element 說明Description
wsws 選擇性的空白字元。Optional white space. 如果 style 包含 NumberStyles.AllowLeadingWhite 旗標,或如果 style 包含 NumberStyles.AllowTrailingWhite 旗標,則 ss 開頭會出現空白字元。White space can appear at the beginning of s if style includes the NumberStyles.AllowLeadingWhite flag, or 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 provider 參數的 GetFormat 方法所傳回之 NumberFormatInfo 物件的 CurrencyPositivePattern 屬性所定義。Its position in the string is defined by the CurrencyPositivePattern property of the NumberFormatInfo object returned by the GetFormat method of the provider parameter. 如果 style 包含 NumberStyles.AllowCurrencySymbol 旗標,貨幣符號可能會出現在 s 中。The 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 style 包含 NumberStyles.AllowLeadingSignNumberStyles.AllowTrailingSign 旗標,符號符號可能會出現在 s 中。A sign symbol can appear in s if style includes the NumberStyles.AllowLeadingSign or NumberStyles.AllowTrailingSign flags.
digitsdigits 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. 如果 style 包含 NumberStyles.AllowThousands 旗標,provider 所指定之文化特性的千位分隔符號會出現在 s 中。The 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 style 包含 NumberStyles.AllowDecimalPoint 旗標,provider 所指定文化特性的小數點符號會出現在 s 中。The decimal point symbol of the culture specified by provider can appear in s if style includes the NumberStyles.AllowDecimalPoint flag.
fractional_digitsfractional_digits 數位0的一或多個出現次數。One or more occurrences of the digit 0. 只有在 style 包含 NumberStyles.AllowDecimalPoint 旗標時,小數位數才會出現在 s 中。Fractional digits can appear in s only if style includes the NumberStyles.AllowDecimalPoint flag.
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 style 包含 NumberStyles.AllowExponent 旗標,s 參數可以表示指數標記法中的數位。The 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,剖析作業都會忽略 s 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 旗標)一律會成功剖析。A string with decimal digits only (which corresponds to the NumberStyles.None flag) always parses successfully. 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 s中可能存在的元素。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(.)和fractional_digits元素。The decimal point (.) and fractional_digits elements. 不過, fractional_digits必須只包含一或多個0位數,否則方法會傳回 falseHowever, fractional_digits must consist of only one or more 0 digits or the method returns false.
NumberStyles.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,則必須代表不含非零小陣列件的 Int32 資料類型範圍內的整數。If s represents a number in exponential notation, it must represent an integer within the range of the Int32 data type without a non-zero, fractional component.
NumberStyles.AllowLeadingWhite s開頭的ws元素。The ws element at the beginning of s.
NumberStyles.AllowTrailingWhite s結尾的ws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.
NumberStyles.Currency 所有元素。All elements. 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.
NumberStyles.Float s開頭或結尾的ws元素、s開頭的符號,以及小數點(.)符號。The ws element at the beginning or end of s, sign at the beginning of s, and the decimal point (.) symbol. s 參數也可以使用指數標記法。The s parameter can also use exponential notation.
NumberStyles.Number Wssign、千位分隔符號()和小數點(.)元素。The ws, sign, thousands separator (,), and decimal point (.) elements.
NumberStyles.Any 除了 s 以外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.

如果使用 NumberStyles.AllowHexSpecifier 旗標,s 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 中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. NumberStyles 列舉具有複合樣式,NumberStyles.HexNumber,其中同時包含空白字元旗標)。(The NumberStyles enumeration has a composite style, NumberStyles.HexNumber, that includes both white space flags.)

provider 參數是 IFormatProvider 的執行,例如 CultureInfo 物件或 NumberFormatInfo 物件,其 GetFormat 方法會傳回 NumberFormatInfo 物件。The provider parameter is an IFormatProvider implementation, such as a CultureInfo object or a NumberFormatInfo object, whose GetFormat method returns a NumberFormatInfo object. NumberFormatInfo 物件提供有關 s格式的特定文化特性資訊。The NumberFormatInfo object provides culture-specific information about the format of s. 如果 null``provider,則會使用目前文化特性的 NumberFormatInfo 物件。If provider is null, the NumberFormatInfo object for the current culture is used.

另請參閱

TryParse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider, Int32)

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 32 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 32-bit signed integer equivalent. 傳回指示轉換是否成功的值。A return value indicates whether the conversion succeeded.

public:
 static bool TryParse(ReadOnlySpan<char> s, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] int % result);
public static bool TryParse (ReadOnlySpan<char> s, System.Globalization.NumberStyles style, IFormatProvider provider, out int result);
static member TryParse : ReadOnlySpan<char> * System.Globalization.NumberStyles * IFormatProvider * int -> bool
Public Shared Function TryParse (s As ReadOnlySpan(Of Char), style As NumberStyles, provider As IFormatProvider, ByRef result As Integer) As Boolean

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 that represent the number to convert. 此範圍使用 style 指定的樣式來解譯The span is interpreted using the style specified by style

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

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.

result
Int32

如果轉換成功,這個方法會傳回包含與 s 中內含數字相等的 32 位元帶正負號整數,如果轉換失敗則為零。When this method returns, contains the 32-bit signed integer value equivalent of the number contained in s, if the conversion succeeded, or zero if the conversion failed. 轉換失敗的狀況包括:如果 s 參數為 nullEmpty、格式與 style 不相容,或是表示小於 MinValue 或大於 MaxValue 的數字。The conversion fails if the s parameter is null or Empty, is not in a format compliant with style, or represents a number less than MinValue or greater than MaxValue. 這個參數未初始化便傳遞,result 中原始提供的任何值都將遭到覆寫。This parameter is passed uninitialized; any value originally supplied in result will be overwritten.

傳回

如果 true 轉換成功,則為 s,否則為 falsetrue if s was converted successfully; otherwise, false.

適用於