Int32.TryParse Int32.TryParse Int32.TryParse Int32.TryParse Method

定义

将数字的字符串表示形式转换为它的等效 32 位有符号整数。Converts the string representation of a number to its 32-bit signed integer equivalent. 一个指示操作是否成功的返回值。A return value indicates whether the operation succeeded.

重载

TryParse(String, Int32) TryParse(String, Int32) TryParse(String, Int32) TryParse(String, Int32)

将数字的字符串表示形式转换为它的等效 32 位有符号整数。Converts the string representation of a number to its 32-bit signed integer equivalent. 一个指示转换是否成功的返回值。A return value indicates whether the conversion succeeded.

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

将指定样式和区域性特定格式的数字的字符串表示形式转换为它的等效 32 位有符号整数。Converts the string representation of a number in a specified style and culture-specific format to its 32-bit signed integer equivalent. 一个指示转换是否成功的返回值。A return value indicates whether the conversion succeeded.

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

TryParse(String, Int32) TryParse(String, Int32) TryParse(String, Int32) TryParse(String, Int32)

将数字的字符串表示形式转换为它的等效 32 位有符号整数。Converts the string representation of a number to its 32-bit signed integer equivalent. 一个指示转换是否成功的返回值。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 *  -> bool
Public Shared Function TryParse (s As String, ByRef result As Integer) As Boolean

参数

s
String String String String

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

result
Int32 Int32 Int32 Int32

当此方法返回时,如果转换成功,则包含与 s 中所包含的数字等效的 32 位无符号整数值;如果转换失败,则包含零。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 参数为 nullEmpty、格式不正确,或者表示的数字小于 MinValue 或大于 MaxValue,则转换失败。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. 此参数未经初始化即进行传递;最初在 result 中提供的任何值都会被覆盖。This parameter is passed uninitialized; any value originally supplied in result will be overwritten.

返回

如果 true 成功转换,则为 s;否则为 falsetrue if s was converted successfully; otherwise, false.

示例

下面的示例调用Int32.TryParse(String, Int32)使用大量不同的字符串值的方法。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.

一些字符串,TryParse(String, Int32)方法不能进行转换在此示例是:Some of the strings that the TryParse(String, Int32) method is unable to convert in this example are:

  • "9432.0"."9432.0". 转换失败,因为该字符串不能包含十进制分隔符,则它必须包含仅整数位。The conversion fails because the string cannot contain a decimal separator; it must contain integral digits only.

  • "16,667"."16,667". 转换失败,因为该字符串不能包含组分隔符,则为它必须包含仅整数位。The conversion fails because the string cannot contain group separators; it must contain integral digits only.

  • "(100)"."(100)". 转换失败,因为该字符串不能包含不是由当前区域性定义负号NumberFormatInfo.NegativeSignNumberFormatInfo.NumberNegativePattern属性。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". 转换失败,因为该字符串不能包含十六进制数字;它必须包含仅为十进制数字。The conversion fails because the string cannot contain hexadecimal digits; it must contain decimal digits only.

注解

TryParse方法就像Parse方法中,除TryParse方法不会引发异常,如果转换失败。The TryParse method is like the Parse method, except the TryParse method does not throw an exception if the conversion fails. 它消除了需要使用异常处理来测试FormatException的事件中s无效,不能成功分析。It 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参数包含多个窗体:The s parameter contains a number of the form:

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

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

元素Element 描述Description
wsws 可选的空白区域。Optional white space.
signsign 一个可选符号后。An optional sign.
digitsdigits 范围从 0 到 9 的数字的序列。A sequence of digits ranging from 0 to 9.

s参数被解释使用NumberStyles.Integer样式。The s parameter is interpreted using the NumberStyles.Integer style. 除了十进制数字,允许仅前导空格和尾随空格以及前导符号。In addition to the decimal digits, only leading and trailing spaces together with a leading sign are allowed. 若要显式定义的样式元素以及可出现在特定于区域性的格式设置信息s,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使用中的格式设置信息分析参数NumberFormatInfo对象初始化为当前系统区域性。The s parameter is parsed using the formatting information in a NumberFormatInfo object initialized for the current system culture. 有关详情,请参阅CurrentInfoFor more information, see CurrentInfo.

此重载TryParse方法中的所有数字都解释s为十进制数字的参数。This overload of the TryParse method interprets all digits in the s parameter as decimal digits. 若要分析的十六进制数字的字符串表示形式,请调用Int32.TryParse(String, NumberStyles, IFormatProvider, Int32)重载。To parse the string representation of a hexadecimal number, call the Int32.TryParse(String, NumberStyles, IFormatProvider, Int32) overload.

另请参阅

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

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> *  -> bool
Public Shared Function TryParse (s As ReadOnlySpan(Of Char), ByRef result As Integer) As Boolean

参数

返回

TryParse(String, NumberStyles, IFormatProvider, Int32) TryParse(String, NumberStyles, IFormatProvider, Int32) TryParse(String, NumberStyles, IFormatProvider, Int32) TryParse(String, NumberStyles, IFormatProvider, Int32)

将指定样式和区域性特定格式的数字的字符串表示形式转换为它的等效 32 位有符号整数。Converts the string representation of a number in a specified style and culture-specific format to its 32-bit signed integer equivalent. 一个指示转换是否成功的返回值。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 *  -> bool
Public Shared Function TryParse (s As String, style As NumberStyles, provider As IFormatProvider, ByRef result As Integer) As Boolean

参数

s
String String String String

包含要转换的数字的字符串。A string containing a number to convert. 该字符串使用由 style 指定的样式来进行解释。The string is interpreted using the style specified by style.

style
NumberStyles NumberStyles NumberStyles NumberStyles

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

provider
IFormatProvider IFormatProvider IFormatProvider IFormatProvider

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

result
Int32 Int32 Int32 Int32

当此方法返回时,如果转换成功,则包含与 s 中所包含的数字等效的 32 位无符号整数值;如果转换失败,则包含零。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 参数为 nullEmpty、格式不符合 style,或者表示的数字小于 MinValue 或大于 MaxValue,则转换失败。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. 此参数未经初始化即进行传递;最初在 result 中提供的任何值都会被覆盖。This parameter is passed uninitialized; any value originally supplied in result will be overwritten.

返回

如果 true 成功转换,则为 s;否则为 falsetrue if s was converted successfully; otherwise, false.

异常

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

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

示例

下面的示例调用Int32.TryParse(String, NumberStyles, IFormatProvider, Int32)具有多种不同的字符串方法和NumberStyles值。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.

注解

TryParse方法就像Parse方法中,除TryParse方法不会引发异常,如果转换失败。The TryParse method is like the Parse method, except the TryParse method does not throw an exception if the conversion fails. 它消除了需要使用异常处理来测试FormatException的事件中s无效,不能成功分析。It 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参数定义中允许的样式元素 (如空格或正号或负号)s分析操作成功的参数。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. 它必须是从位标志的组合NumberStyles枚举。It must be a combination of bit flags from the NumberStyles enumeration. 具体取决于值style,则s参数可能包含以下元素:Depending on the value of style, the s parameter may include the following elements:

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

或者,如果style参数包含AllowHexSpecifier:Or, if the style parameter includes AllowHexSpecifier:

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

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

元素Element 描述Description
wsws 可选的空白区域。Optional white space. 空白可以出现在开头s如果style包括NumberStyles.AllowLeadingWhite标志,或在末尾s如果style包括NumberStyles.AllowTrailingWhite标志。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.
$ 特定于区域性的货币符号。A culture-specific currency symbol. 在字符串中的位置由CurrencyPositivePattern的属性NumberFormatInfo返回的对象GetFormat方法的provider参数。Its position in the string is defined by the CurrencyPositivePattern property of the NumberFormatInfo object returned by the GetFormat method of the provider parameter. 货币符号可以出现在s如果style包括NumberStyles.AllowCurrencySymbol标志。The currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag.
signsign 一个可选符号后。An optional sign. 正负符号可以出现在s如果style包括NumberStyles.AllowLeadingSignNumberStyles.AllowTrailingSign标志。A sign symbol can appear in s if style includes the NumberStyles.AllowLeadingSign or NumberStyles.AllowTrailingSign flags.
digitsdigits 从 0 到 9 的数字的序列。A sequence of digits from 0 through 9.
, 特定于区域性的千位分隔符。A culture-specific thousands separator. 千位分隔符的指定的区域性provider可以出现在s如果style包括NumberStyles.AllowThousands标志。The thousands separator of the culture specified by provider can appear in s if style includes the NumberStyles.AllowThousands flag.
.. 特定于区域性的小数点符号。A culture-specific decimal point symbol. 指定的区域性的小数点符号provider可以出现在s如果style包括NumberStyles.AllowDecimalPoint标志。The decimal point symbol of the culture specified by provider can appear in s if style includes the NumberStyles.AllowDecimalPoint flag.
fractional_digitsfractional_digits 数字 0 的一个或多个匹配项。One or more occurrences of the digit 0. 在中出现的小数位s仅当style包括NumberStyles.AllowDecimalPoint标志。Fractional digits can appear in s only if style includes the NumberStyles.AllowDecimalPoint flag.
ee E 或者 E 字符,它指示指数记数法中表示值。The 'e' or 'E' character, which indicates that the value is represented in exponential notation. s参数可以表示指数表示法的数字,如果style包括NumberStyles.AllowExponent标志。The s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag.
hexdigitshexdigits 一系列十六进制数字从 0 到 f 或从 0 到 f。A sequence of hexadecimal digits from 0 through f, or 0 through F.

备注

中的任何终止 NUL (U + 0000) 字符s在分析操作,而不考虑的值,将忽略style参数。Any terminating NUL (U+0000) characters in s are ignored by the parsing operation, regardless of the value of the style argument.

仅带有十进制数字的字符串 (对应于NumberStyles.None标志) 总是可以分析成功。A string with decimal digits only (which corresponds to the NumberStyles.None flag) always parses successfully. 其余的大多数NumberStyles成员控件可能但不是要求必须包含在此输入字符串中的元素。Most of the remaining NumberStyles members control elements that may be but are not required to be present in this input string. 下表指示个别NumberStyles成员影响可能会出现在元素sThe following table indicates how individual NumberStyles members affect the elements that may be present in s.

非复合 NumberStyles 值Non-composite NumberStyles values 除数字之外 s 中允许的元素Elements permitted in s in addition to digits
NumberStyles.None 十进制数字。Decimal digits only.
NumberStyles.AllowDecimalPoint 小数点 () 和fractional_digits元素。The decimal point (.) and fractional_digits elements. 但是, fractional_digits必须包含一个或多个数字 0 或该方法返回的falseHowever, fractional_digits must consist of only one or more 0 digits or the method returns false.
NumberStyles.AllowExponent s参数还可以使用指数记数法。The s parameter can also use exponential notation. 如果s表示一个指数表示法数字时,它必须表示一个整数的范围内Int32不带小数部分非零值的数据类型。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 Ws开头的元素sThe ws element at the beginning of s.
NumberStyles.AllowTrailingWhite Ws结尾的元素sThe ws element at the end of s.
NumberStyles.AllowLeadingSign 可以在其之前显示登录位数A sign can appear before digits.
NumberStyles.AllowTrailingSign 登录后可以出现位数A sign can appear after digits.
NumberStyles.AllowParentheses 登录形式的括号内包含的数字值的元素。The sign element in the form of parentheses enclosing the numeric value.
NumberStyles.AllowThousands 千位分隔符 () 元素。The thousands separator (,) element.
NumberStyles.AllowCurrencySymbol $ 元素。The $ element.
NumberStyles.Currency 所有元素。All elements. s参数不能表示十六进制数或指数表示法的数字。The s parameter cannot represent a hexadecimal number or a number in exponential notation.
NumberStyles.Float Ws元素的开头或末尾s登录开头s,和小数点 () 符号。The ws element at the beginning or end of s, sign at the beginning of s, and the decimal point (.) symbol. s参数还可以使用指数记数法。The s parameter can also use exponential notation.
NumberStyles.Number Ws登录,千位分隔符 (),和小数点 () 元素。The ws, sign, thousands separator (,), and decimal point (.) elements.
NumberStyles.Any 所有样式,除非s不能表示十六进制数。All styles, except s cannot represent a hexadecimal number.

如果NumberStyles.AllowHexSpecifier使用标志,s必须是不带前缀的十六进制值。If the NumberStyles.AllowHexSpecifier flag is used, s must be a hexadecimal value without a prefix. 例如,"C9AF3"分析成功,但是"0xC9AF3"却没有。For example, "C9AF3" parses successfully, but "0xC9AF3" does not. 其他标志只有可出现在styleNumberStyles.AllowLeadingWhiteNumberStyles.AllowTrailingWhiteThe only other flags that can be present in style are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (NumberStyles枚举具有复合样式NumberStyles.HexNumber,其中包含这两个空白标志。)(The NumberStyles enumeration has a composite style, NumberStyles.HexNumber, that includes both white space flags.)

provider参数是IFormatProvider实现,如CultureInfo对象或NumberFormatInfo对象,其GetFormat方法将返回NumberFormatInfo对象。The provider parameter is an IFormatProvider implementation, such as a CultureInfo object or a NumberFormatInfo object, whose GetFormat method returns a NumberFormatInfo object. NumberFormatInfo对象提供特定于区域性的格式信息sThe NumberFormatInfo object provides culture-specific information about the format of s. 如果providernull,则NumberFormatInfo对象使用当前区域性。If provider is null, the NumberFormatInfo object for the current culture is used.

另请参阅

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

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 *  -> bool
Public Shared Function TryParse (s As ReadOnlySpan(Of Char), style As NumberStyles, provider As IFormatProvider, ByRef result As Integer) As Boolean

参数

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