Byte.TryParse 方法

定义

尝试将数字的字符串表示形式转换为它的等效 Byte,并返回一个指示转换是否成功的值。Tries to convert the string representation of a number to its Byte equivalent, and returns a value that indicates whether the conversion succeeded.

重载

TryParse(String, Byte)

尝试将数字的字符串表示形式转换为它的等效 Byte,并返回一个指示转换是否成功的值。Tries to convert the string representation of a number to its Byte equivalent, and returns a value that indicates whether the conversion succeeded.

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

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 ByteConverts the string representation of a number in a specified style and culture-specific format to its Byte equivalent. 一个指示转换是否成功的返回值。A return value indicates whether the conversion succeeded or failed.

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

TryParse(String, Byte)

尝试将数字的字符串表示形式转换为它的等效 Byte,并返回一个指示转换是否成功的值。Tries to convert the string representation of a number to its Byte equivalent, and returns a value that indicates whether the conversion succeeded.

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

参数

s
String

包含要转换的数字的字符串。A string that contains a number to convert. 该字符串使用 Integer 样式来进行解释。The string is interpreted using the Integer style.

result
Byte

当此方法返回时,如果转换成功,则包含与 Byte 中所包含的数字等效的 s 值;如果转换失败,则包含零。When this method returns, contains the Byte value equivalent to the number contained in s if the conversion succeeded, or zero if the conversion failed. 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

下面的示例使用多TryParse(String, Byte)个不同的字符串值调用方法。The following example calls the TryParse(String, Byte) method with a number of different string values.

using namespace System;

void main()
{
   array<String^>^ byteStrings = gcnew array<String^> { nullptr, String::Empty, 
                                                        "1024", "100.1", "100", 
                                                        "+100", "-100", "000000000000000100", 
                                                        "00,100", "   20   ", "FF", "0x1F" };
   Byte byteValue;
   for each (String^ byteString in byteStrings) {
      bool result = Byte::TryParse(byteString, byteValue);
      if (result)
         Console::WriteLine("Converted '{0}' to {1}", 
                            byteString, byteValue);
      else
         Console::WriteLine("Attempted conversion of '{0}' failed.", 
                            byteString);
   }
}
// The example displays the following output:
//       Attempted conversion of '' failed.
//       Attempted conversion of '' failed.`
//       Attempted conversion of '1024' failed.
//       Attempted conversion of '100.1' failed.
//       Converted '100' to 100
//       Converted '+100' to 100
//       Attempted conversion of '-100' failed.
//       Converted '000000000000000100' to 100
//       Attempted conversion of '00,100' failed.
//       Converted '   20   ' to 20
//       Attempted conversion of 'FF' failed.
//       Attempted conversion of '0x1F' failed.}
using System;

public class ByteConversion
{
   public static void Main()
   {
      string[] byteStrings = { null, string.Empty, "1024",
                               "100.1", "100", "+100", "-100",
                               "000000000000000100", "00,100",
                               "   20   ", "FF", "0x1F" };

      foreach (var byteString in byteStrings)
      {
          CallTryParse(byteString);
      }
   }

   private static void CallTryParse(string stringToConvert)
   {  
      byte byteValue; 
      bool success = Byte.TryParse(stringToConvert, out byteValue);
      if (success)
      {
         Console.WriteLine("Converted '{0}' to {1}", 
                        stringToConvert, byteValue);
      }
      else
      {
         Console.WriteLine("Attempted conversion of '{0}' failed.", 
                           stringToConvert);
      }
   }    
}
// The example displays the following output to the console:
//       Attempted conversion of '' failed.
//       Attempted conversion of '' failed.
//       Attempted conversion of '1024' failed.
//       Attempted conversion of '100.1' failed.
//       Converted '100' to 100
//       Converted '+100' to 100
//       Attempted conversion of '-100' failed.
//       Converted '000000000000000100' to 100
//       Attempted conversion of '00,100' failed.
//       Converted '   20   ' to 20
//       Attempted conversion of 'FF' failed.
//       Attempted conversion of '0x1F' failed.
Module ByteConversion
   Public Sub Main()
      Dim byteStrings() As String = { Nothing, String.Empty, "1024", 
                                    "100.1", "100", "+100", "-100",
                                    "000000000000000100", "00,100",
                                    "   20   ", "FF", "0x1F"}

      For Each byteString As String In byteStrings
        CallTryParse(byteString)
      Next
   End Sub
   
   Private Sub CallTryParse(stringToConvert As String)  
      Dim byteValue As Byte
      Dim success As Boolean = Byte.TryParse(stringToConvert, byteValue)
      If success Then
         Console.WriteLine("Converted '{0}' to {1}", _
                        stringToConvert, byteValue)
      Else
         Console.WriteLine("Attempted conversion of '{0}' failed.", _
                           stringToConvert)
      End If                        
   End Sub
End Module
' The example displays the following output to the console:
'       Attempted conversion of '' failed.
'       Attempted conversion of '' failed.
'       Attempted conversion of '1024' failed.
'       Attempted conversion of '100.1' failed.
'       Converted '100' to 100
'       Converted '+100' to 100
'       Attempted conversion of '-100' failed.
'       Converted '000000000000000100' to 100
'       Attempted conversion of '00,100' failed.
'       Converted '   20   ' to 20
'       Attempted conversion of 'FF' failed.
'       Attempted conversion of '0x1F' failed.

注解

false MaxValue MinValue null String.Empty如果参数的格式不正确(如果是或),或者如果它表示的数字小于或大于,则转换将失败,并且方法将返回。 sThe conversion fails and the method returns false if the s parameter is not in the correct format, if it is null or String.Empty, or if it represents a number less than MinValue or greater than MaxValue.

方法与Byte.Parse(String)方法类似,不同TryParse(String, Byte)的是,如果转换失败,则不会引发异常。 Byte.TryParse(String, Byte)The Byte.TryParse(String, Byte) method is similar to the Byte.Parse(String) method, except that TryParse(String, Byte) does not throw an exception if the conversion fails.

s参数应为以下形式的数字的字符串表示形式:The s parameter should be the string representation of a number in the following form:

[ws][sign]digits[ws]  

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

元素Element 说明Description
wsws 可选空白。Optional white space.
signsign 由当前区域性的NumberFormatInfo.PositiveSign属性指定的可选正号。An optional positive sign, as specified by the NumberFormatInfo.PositiveSign property of the current culture.
digitsdigits 十进制数字的序列,范围为0到9。A sequence of decimal digits that range from 0 to 9.

使用样式对s Integer参数进行解释。The s parameter is interpreted using the Integer style. 除了字节值的十进制数外,只允许使用前导和尾随空格以及前导符号。In addition to the byte value's decimal digits, only leading and trailing spaces together with a leading sign are allowed. (如果存在符号,则它必须是正号,否则方法将引发OverflowException。)若要s Byte.Parse(String, NumberStyles, IFormatProvider)使用中提供的区域性特定格式设置信息显式定义样式元素,请使用方法。(If the sign is present, it must be a positive sign or the method throws an OverflowException.) To explicitly define the style elements together with the culture-specific formatting information that can be present in s, use the Byte.Parse(String, NumberStyles, IFormatProvider) method.

使用当前区域性的NumberFormatInfo对象中的格式设置信息分析参数。sThe s parameter is parsed using the formatting information in a NumberFormatInfo object for the current culture. 有关详细信息,请参阅 NumberFormatInfo.CurrentInfoFor more information, see NumberFormatInfo.CurrentInfo.

Byte.TryParse(String, Byte)方法的重载将参数中的s所有数字解释为十进制数字。This overload of the Byte.TryParse(String, Byte) method interprets all digits in the s parameter as decimal digits. 若要分析十六进制数的字符串表示形式,请调用Byte.TryParse(String, NumberStyles, IFormatProvider, Byte)重载。To parse the string representation of a hexadecimal number, call the Byte.TryParse(String, NumberStyles, IFormatProvider, Byte) overload.

另请参阅

TryParse(ReadOnlySpan<Char>, Byte)

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

参数

result
Byte

返回

TryParse(String, NumberStyles, IFormatProvider, Byte)

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 ByteConverts the string representation of a number in a specified style and culture-specific format to its Byte equivalent. 一个指示转换是否成功的返回值。A return value indicates whether the conversion succeeded or failed.

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

参数

s
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

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

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. 如果 providernull,则使用当前区域性。If provider is null, the thread current culture is used.

result
Byte

当此方法返回时,如果转换成功,则包含与 s 中所含数字等效的 8 位无符号整数值;如果转换失败,则包含零。When this method returns, contains the 8-bit unsigned integer value equivalent to 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.

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

下面的示例使用多TryParse(String, NumberStyles, IFormatProvider, Byte)个不同的字符串值调用方法。The following example calls the TryParse(String, NumberStyles, IFormatProvider, Byte) method with a number of different string values.

using namespace System;
using namespace System::Globalization;

void CallTryParse(String^ byteString, NumberStyles styles);

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

   byteString = "1024";
   styles = NumberStyles::Integer;
   CallTryParse(byteString, styles);

   byteString = "100.1";
   styles = NumberStyles::Integer | NumberStyles::AllowDecimalPoint;
   CallTryParse(byteString, styles);

   byteString = "100.0";
   CallTryParse(byteString, styles);

   byteString = "+100";
   styles = NumberStyles::Integer | NumberStyles::AllowLeadingSign 
            | NumberStyles::AllowTrailingSign;
   CallTryParse(byteString, styles);

   byteString = "-100";
   CallTryParse(byteString, styles);

   byteString = "000000000000000100";
   CallTryParse(byteString, styles);

   byteString = "00,100";
   styles = NumberStyles::Integer | NumberStyles::AllowThousands;
   CallTryParse(byteString, styles);

   byteString = "2E+3   ";
   styles = NumberStyles::Integer | NumberStyles::AllowExponent;
   CallTryParse(byteString, styles);

   byteString = "FF";
   styles = NumberStyles::HexNumber;
   CallTryParse(byteString, styles);

   byteString = "0x1F";
   CallTryParse(byteString, styles);
}

void CallTryParse(String^ stringToConvert, NumberStyles styles)
{  
   Byte byteValue;
   bool result = Byte::TryParse(stringToConvert, styles, 
                                 (IFormatProvider^) nullptr , byteValue);
   if (result)
      Console::WriteLine("Converted '{0}' to {1}", 
                     stringToConvert, byteValue);
   else
      Console::WriteLine("Attempted conversion of '{0}' failed.", 
                        stringToConvert);
}
// The example displays the following output:
//       Attempted conversion of '1024' failed.
//       Attempted conversion of '100.1' failed.
//       Converted '100.0' to 100
//       Converted '+100' to 100
//       Attempted conversion of '-100' failed.
//       Converted '000000000000000100' to 100
//       Converted '00,100' to 100
//       Attempted conversion of '2E+3   ' failed.
//       Converted 'FF' to 255
//       Attempted conversion of '0x1F' failed.}
using System;
using System.Globalization;

public class ByteConversion2
{
   public static void Main()
   {
      string byteString; 
      NumberStyles styles;
      
      byteString = "1024";
      styles = NumberStyles.Integer;
      CallTryParse(byteString, styles);
      
      byteString = "100.1";
      styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
      CallTryParse(byteString, styles);
      
      byteString = "100.0";
      CallTryParse(byteString, styles);
      
      byteString = "+100";
      styles = NumberStyles.Integer | NumberStyles.AllowLeadingSign 
               | NumberStyles.AllowTrailingSign;
      CallTryParse(byteString, styles);
      
      byteString = "-100";
      CallTryParse(byteString, styles);
      
      byteString = "000000000000000100";
      CallTryParse(byteString, styles);
      
      byteString = "00,100";
      styles = NumberStyles.Integer | NumberStyles.AllowThousands;
      CallTryParse(byteString, styles);
      
      byteString = "2E+3   ";
      styles = NumberStyles.Integer | NumberStyles.AllowExponent;
      CallTryParse(byteString, styles);
      
      byteString = "FF";
      styles = NumberStyles.HexNumber;
      CallTryParse(byteString, styles);
      
      byteString = "0x1F";
      CallTryParse(byteString, styles);
   }

   private static void CallTryParse(string stringToConvert, NumberStyles styles)
   {  
      Byte byteValue;
      bool result = Byte.TryParse(stringToConvert, styles, 
                                  null as IFormatProvider, out byteValue);
      if (result)
         Console.WriteLine("Converted '{0}' to {1}", 
                        stringToConvert, byteValue);
      else
         Console.WriteLine("Attempted conversion of '{0}' failed.", 
                           stringToConvert.ToString());
   }
}
// The example displays the following output to the console:
//       Attempted conversion of '1024' failed.
//       Attempted conversion of '100.1' failed.
//       Converted '100.0' to 100
//       Converted '+100' to 100
//       Attempted conversion of '-100' failed.
//       Converted '000000000000000100' to 100
//       Converted '00,100' to 100
//       Attempted conversion of '2E+3   ' failed.
//       Converted 'FF' to 255
//       Attempted conversion of '0x1F' failed.
Imports System.Globalization

Module ByteConversion2
   Public Sub Main()
      Dim byteString As String 
      Dim styles As NumberStyles
      
      byteString = "1024"
      styles = NumberStyles.Integer
      CallTryParse(byteString, styles)
      
      byteString = "100.1"
      styles = NumberStyles.Integer Or NumberStyles.AllowDecimalPoint
      CallTryParse(byteString, styles)
      
      byteString = "100.0"
      CallTryParse(byteString, styles)
      
      byteString = "+100"
      styles = NumberStyles.Integer Or NumberStyles.AllowLeadingSign _
               Or NumberStyles.AllowTrailingSign
      CallTryParse(byteString, styles)
      
      byteString = "-100"
      CallTryParse(byteString, styles)
      
      byteString = "000000000000000100"
      CallTryParse(byteString, styles)
      
      byteString = "00,100"      
      styles = NumberStyles.Integer Or NumberStyles.AllowThousands
      CallTryParse(byteString, styles)
      
      byteString = "2E+3   "
      styles = NumberStyles.Integer Or NumberStyles.AllowExponent
      CallTryParse(byteString, styles)
      
      byteString = "FF"
      styles = NumberStyles.HexNumber
      CallTryParse(byteString, styles)
      
      byteString = "0x1F"
      CallTryParse(byteString, styles)
   End Sub
   
   Private Sub CallTryParse(stringToConvert As String, styles As NumberStyles)  
      Dim byteValue As Byte
      Dim result As Boolean = Byte.TryParse(stringToConvert, styles, Nothing, _
                                            byteValue)
      If result Then
         Console.WriteLine("Converted '{0}' to {1}", _
                        stringToConvert, byteValue)
      Else
         If stringToConvert Is Nothing Then stringToConvert = ""
         Console.WriteLine("Attempted conversion of '{0}' failed.", _
                           stringToConvert.ToString())
      End If                        
   End Sub
End Module
' The example displays the following output to the console:
'       Attempted conversion of '1024' failed.
'       Attempted conversion of '100.1' failed.
'       Converted '100.0' to 100
'       Converted '+100' to 100
'       Attempted conversion of '-100' failed.
'       Converted '000000000000000100' to 100
'       Converted '00,100' to 100
'       Attempted conversion of '2E+3   ' failed.
'       Converted 'FF' to 255
'       Attempted conversion of '0x1F' failed.

注解

方法与Parse方法类似,不同TryParse的是,如果转换失败,方法不会引发异常。 TryParseThe TryParse method is like the Parse method, except the TryParse method does not throw an exception if the conversion fails.

使用参数提供NumberFormatInfo的对象中的格式设置信息分析参数。s providerThe s parameter is parsed using the formatting information in a NumberFormatInfo object supplied by the provider parameter.

Style 参数定义s参数中允许的样式元素(如空格或正号),以便分析操作成功。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. 它必须是NumberStyles枚举中的位标志的组合。It must be a combination of bit flags from the NumberStyles enumeration. 根据的值style s , 参数可能包括以下元素:Depending on the value of style, the s parameter may include the following elements:

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

或者,如果style参数包括AllowHexSpecifierOr, if the style parameter includes AllowHexSpecifier:

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

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

元素Element 说明Description
wsws 可选空白。Optional white space. s NumberStyles.AllowTrailingWhite如果包含style标志,或者如果style包含标志,则空格可以NumberStyles.AllowLeadingWhite出现在的开头。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.
$ 区域性特定的货币符号。A culture-specific currency symbol. 其在字符串中的NumberFormatInfo.CurrencyPositivePattern位置由provider参数GetFormat方法返回的NumberFormatInfo对象的属性定义。Its position in the string is defined by the NumberFormatInfo.CurrencyPositivePattern property of the NumberFormatInfo object returned by the GetFormat method of the provider parameter. 如果s style包含标志,则货币符号可以出现在中。NumberStyles.AllowCurrencySymbolThe currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag.
signsign 可选正号。An optional positive sign. (如果中s存在负号,则分析操作将失败。)s s style NumberStyles.AllowTrailingSign如果包含style 标志,则符号可以出现在开头;如果包含标志,NumberStyles.AllowLeadingSign则为末尾处。(The parse operation fails if a negative sign is present in s.) The 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.
digitsdigits 介于0到9之间的一系列数字。A sequence of digits from 0 through 9.
.. 区域性特定的小数点符号。A culture-specific decimal point symbol. provider s如果包含NumberStyles.AllowDecimalPoint标志, 则指定的区域性的小数点符号可以出现在中。 styleThe decimal point symbol of the culture specified by provider can appear in s if style includes the NumberStyles.AllowDecimalPoint flag.
fractional_digitsfractional_digits 数字0的一个或多个匹配项。One or more occurrences of the digit 0. 仅当包含s style标志时, 小数位才能出现在中NumberStyles.AllowDecimalPointFractional digits can appear in s only if style includes the NumberStyles.AllowDecimalPoint flag.
ee E 或 E 字符,指示值以指数表示法表示。The e or E character, which indicates that the value is represented in exponential notation. 如果s 包含标志NumberStyles.AllowExponent , 则参数可以表示指数表示法中的数字。 styleThe s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag.
hexdigitshexdigits 从0到 f 的十六进制数字序列, 或者从0到 F。A sequence of hexadecimal digits from 0 through f, or 0 through F.

备注

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

只包含十进制数字的字符串(对应NumberStyles.None于样式)始终会成功分析。A string with decimal digits only (which corresponds to the NumberStyles.None style) always parses successfully. 大多数其余NumberStyles成员控件元素在此输入字符串中可能已存在但不是必需的。Most of the remaining NumberStyles members control elements that may be but are not required to be present in this input string. 下表指示各个NumberStyles成员如何影响可能出现在中s的元素。The following table indicates how individual NumberStyles members affect the elements that may be present in s.

非复合 NumberStyles 值Non-composite NumberStyles values 除数字外允许在 s 中使用的元素Elements permitted in s in addition to digits
NumberStyles.None 仅十进制数字。Decimal digits only.
NumberStyles.AllowDecimalPoint .The . fractional_digits元素。and fractional_digits elements. 但是, fractional_digits必须只包含一个或多个0位数,否则该方法false将返回。However, 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表示法。The s parameter can also use exponential notation. 如果s表示指数表示法中的数字,则该数字必须表示Byte数据类型范围内的一个整数,该数据类型的范围内没有非零的小数部分。If s represents a number in exponential notation, it must represent an integer within the range of the Byte data type without a non-zero, fractional component.
NumberStyles.AllowLeadingWhite 开头sws元素。The ws element at the beginning of s.
NumberStyles.AllowTrailingWhite 末尾s处的ws元素。The ws element at the end of s.
NumberStyles.AllowLeadingSign 正负号可以出现在数字之前。A positive sign can appear before digits.
NumberStyles.AllowTrailingSign 正负号可以出现在数字之后。A positive sign can appear after digits.
NumberStyles.AllowParentheses 尽管支持此标志,但如果中false s存在括号,则该方法返回。Although this flag is supported, the method returns false if parentheses are present in s.
NumberStyles.AllowThousands 尽管组分隔符符号可以出现在中s,但它前面只能有一个或多个0数字。Although the group separator symbol can appear in s, it can be preceded by only one or more 0 digits.
NumberStyles.AllowCurrencySymbol $ 元素。The $ element.

如果使用s标志,则必须是不带前缀的十六进制值。 NumberStyles.AllowHexSpecifierIf the NumberStyles.AllowHexSpecifier flag is used, s must be a hexadecimal value without a prefix. 例如,"F3" 分析成功,但 "0xF3" 不能。For example, "F3" parses successfully, but "0xF3" does not. style可以存在的唯一其他标志是NumberStyles.AllowLeadingWhiteNumberStyles.AllowTrailingWhiteThe only other flags that can be present in style are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (枚举具有复合数字样式, NumberStyles.HexNumber其中包含两个空格标志。) NumberStyles(The NumberStyles enumeration has a composite number style, NumberStyles.HexNumber, that includes both white space flags.)

IFormatProvider 参数是CultureInfo一个实现,例如对象NumberFormatInfo 或对象GetFormat ,其方法返回对象。NumberFormatInfo providerThe provider parameter is an IFormatProvider implementation, such as a CultureInfo object or a NumberFormatInfo object, whose GetFormat method returns a NumberFormatInfo object. 对象提供有关的格式的s区域性特定信息。 NumberFormatInfoThe NumberFormatInfo object provides culture-specific information about the format of s.

另请参阅

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

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

参数

style
NumberStyles
provider
IFormatProvider
result
Byte

返回

适用于