UInt64.TryParse 方法
定义
尝试将数字的字符串表示形式转换为等效的 64 位无符号整数。Tries to convert the string representation of a number to its 64-bit unsigned integer 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.
重载
| TryParse(String, UInt64) |
尝试将数字的字符串表示形式转换为等效的 64 位无符号整数。Tries to convert the string representation of a number to its 64-bit unsigned integer 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>, UInt64) |
尝试将数字的范围表示形式转换为其等效的 64 位无符号整数。Tries to convert the span representation of a number to its 64-bit unsigned integer 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(String, NumberStyles, IFormatProvider, UInt64) |
尝试将数字的指定样式和区域性特定格式的字符串表示形式转换为其等效的 64 位无符号整数。Tries to convert the string representation of a number in a specified style and culture-specific format to its 64-bit unsigned integer 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, UInt64) |
尝试将指定样式和区域性特定格式的数字的范围表示形式转换为其等效的 64 位无符号整数。Tries to convert the span representation of a number in a specified style and culture-specific format to its 64-bit unsigned integer 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(String, UInt64)
尝试将数字的字符串表示形式转换为等效的 64 位无符号整数。Tries to convert the string representation of a number to its 64-bit unsigned integer 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, [Runtime::InteropServices::Out] System::UInt64 % result);
[System.CLSCompliant(false)]
public static bool TryParse (string s, out ulong result);
public static bool TryParse (string? s, out ulong? result);
[System.CLSCompliant(false)]
public static bool TryParse (string? s, out ulong? result);
[<System.CLSCompliant(false)>]
static member TryParse : string * uint64 -> bool
static member TryParse : string * uint64 -> bool
Public Shared Function TryParse (s As String, ByRef result As ULong) As Boolean
参数
- s
- String
表示要转换的数字的字符串。A string that represents the number to convert.
- result
- UInt64
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 64 位无符号整数值;如果转换失败,则包含零。When this method returns, contains the 64-bit unsigned integer value that is equivalent to the number contained in s, if the conversion succeeded, or zero if the conversion failed. 如果 s 参数为 null 或 Empty、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 false。true if s was converted successfully; otherwise, false.
- 属性
示例
下面的示例 TryParse(String, UInt64) 为字符串数组中的每个元素调用一次方法。The following example calls the TryParse(String, UInt64) method once for each element in a string array.
string[] numericStrings = { "1293.8", "+1671.7", "28347.",
" 33113684 ", "(0)", "-0", "+1293617",
"18-", "119870", "31,024", " 3127094 ",
"00700000" };
ulong number;
foreach (string numericString in numericStrings)
{
if (UInt64.TryParse(numericString, out number))
Console.WriteLine("Converted '{0}' to {1}.", numericString, number);
else
Console.WriteLine("Cannot convert '{0}' to a UInt64.", numericString);
}
// The example displays the following output:
// Cannot convert '1293.8' to a UInt64.
// Cannot convert '+1671.7' to a UInt64.
// Cannot convert '28347.' to a UInt64.
// Converted ' 33113684 ' to 33113684.
// Cannot convert '(0)' to a UInt64.
// Converted '-0' to 0.
// Converted '+1293617' to 1293617.
// Cannot convert '18-' to a UInt64.
// Converted '119870' to 119870.
// Cannot convert '31,024' to a UInt64.
// Converted ' 3127094 ' to 3127094.
// Converted '0070000' to 70000.
Dim numericStrings() As String = {"1293.8", "+1671.7", "28347.", _
" 33113684 ", "(0)", "-0", "+1293617", _
"18-", "119870", "31,024", " 3127094 ", _
"0070000" }
Dim number As ULong
For Each numericString As String In numericStrings
If UInt64.TryParse(numericString, number) Then
Console.WriteLine("Converted '{0}' to {1}.", numericString, number)
Else
Console.WriteLine("Cannot convert '{0}' to a UInt64.", numericString)
End If
Next
' The example displays the following output:
' Cannot convert '1293.8' to a UInt64.
' Cannot convert '+1671.7' to a UInt64.
' Cannot convert '28347.' to a UInt64.
' Converted ' 33113684 ' to 33113684.
' Cannot convert '(0)' to a UInt64.
' Converted '-0' to 0.
' Converted '+1293617' to 1293617.
' Cannot convert '18-' to a UInt64.
' Converted '119870' to 119870.
' Cannot convert '31,024' to a UInt64.
' Converted ' 3127094 ' to 3127094.
' Converted '0070000' to 70000.
注解
TryParse(String, UInt64)方法与 Parse(String) 方法类似,不同之处在于它不会在转换失败时引发异常。The TryParse(String, UInt64) method is like the Parse(String) method, except that it does not throw an exception if the conversion fails. 此方法无需使用异常处理来测试 FormatException if s 是否无效且无法成功分析。This method eliminates the need to use exception handling to test for a FormatException if s is invalid and cannot be successfully parsed.
s参数应为以下形式的十进制数的字符串表示形式:The s parameter should be the string representation of a decimal number in the following form:
[ws][sign]数字[ws][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 | 描述Description |
|---|---|
| wsws | 可选空白。Optional white space. |
| signsign | 一个可选的符号。An optional sign. 有效的符号字符由 NumberFormatInfo.NegativeSign NumberFormatInfo.PositiveSign 当前区域性的和属性确定。Valid sign characters are determined by the NumberFormatInfo.NegativeSign and NumberFormatInfo.PositiveSign properties of the current culture. |
| 位数digits | 十进制数字的序列,范围为0到9。A sequence of decimal digits ranging from 0 to 9. |
s使用样式对参数进行解释 NumberStyles.Integer 。The s parameter is interpreted by using the NumberStyles.Integer style. 除十进制数字外,只允许使用前导符号和尾随空格。In addition to the decimal digits, only leading and trailing spaces with a leading sign are allowed. 若要显式定义具有可在中存在的区域性特定格式设置信息的样式元素 s ,请调用 TryParse(String, NumberStyles, IFormatProvider, UInt64) 方法。To explicitly define the style elements with the culture-specific formatting information that can be present in s, call the TryParse(String, NumberStyles, IFormatProvider, UInt64) method.
备注
参数指定的字符串 s 不能包含任何组分隔符或小数分隔符,并且它不能包含小数部分。The string specified by the s parameter cannot contain any group separators or decimal separator, and it cannot have a fractional portion.
s使用 NumberFormatInfo 为当前系统区域性初始化的对象中的格式设置信息分析参数。The s parameter is parsed using the formatting information in a NumberFormatInfo object initialized for the current system culture. 有关详细信息,请参阅 NumberFormatInfo.CurrentInfo。For more information, see NumberFormatInfo.CurrentInfo.
此重载将参数中的所有数字解释 s 为十进制数字。This overload 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,请改为调用 TryParse(String, NumberStyles, IFormatProvider, UInt64) 重载。To parse the string representation of a hexadecimal number, call the TryParse(String, NumberStyles, IFormatProvider, UInt64) overload instead.
另请参阅
- Parse
- ToString
- 分析 .NET 中的数字字符串Parsing Numeric Strings in .NET
- 示例:.NET Core WinForms 格式设置实用工具 (C#)Sample: .NET Core WinForms Formatting Utility (C#)
- 示例:.NET Core WinForms 格式设置实用工具 (Visual Basic)Sample: .NET Core WinForms Formatting Utility (Visual Basic)
适用于
TryParse(ReadOnlySpan<Char>, UInt64)
重要
此 API 不符合 CLS。
尝试将数字的范围表示形式转换为其等效的 64 位无符号整数。Tries to convert the span representation of a number to its 64-bit unsigned integer 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(ReadOnlySpan<char> s, [Runtime::InteropServices::Out] System::UInt64 % result);
public static bool TryParse (ReadOnlySpan<char> s, out ulong result);
[System.CLSCompliant(false)]
public static bool TryParse (ReadOnlySpan<char> s, out ulong result);
static member TryParse : ReadOnlySpan<char> * uint64 -> bool
[<System.CLSCompliant(false)>]
static member TryParse : ReadOnlySpan<char> * uint64 -> bool
Public Shared Function TryParse (s As ReadOnlySpan(Of Char), ByRef result As ULong) As Boolean
参数
- s
- ReadOnlySpan<Char>
一个范围,包含表示要转换的数字的字符。A span containing the characters that represent the number to convert.
- result
- UInt64
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 64 位无符号整数值;如果转换失败,则包含零。When this method returns, contains the 64-bit unsigned integer value that is equivalent to the number contained in s, if the conversion succeeded, or zero if the conversion failed. 如果 s 参数为 null 或 Empty、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 false。true if s was converted successfully; otherwise, false.
- 属性
适用于
TryParse(String, NumberStyles, IFormatProvider, UInt64)
尝试将数字的指定样式和区域性特定格式的字符串表示形式转换为其等效的 64 位无符号整数。Tries to convert the string representation of a number in a specified style and culture-specific format to its 64-bit unsigned integer 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::UInt64 % result);
[System.CLSCompliant(false)]
public static bool TryParse (string s, System.Globalization.NumberStyles style, IFormatProvider provider, out ulong result);
public static bool TryParse (string? s, System.Globalization.NumberStyles style, IFormatProvider? provider, out ulong? result);
[System.CLSCompliant(false)]
public static bool TryParse (string? s, System.Globalization.NumberStyles style, IFormatProvider? provider, out ulong? result);
[<System.CLSCompliant(false)>]
static member TryParse : string * System.Globalization.NumberStyles * IFormatProvider * uint64 -> bool
static member TryParse : string * System.Globalization.NumberStyles * IFormatProvider * uint64 -> bool
Public Shared Function TryParse (s As String, style As NumberStyles, provider As IFormatProvider, ByRef result As ULong) As Boolean
参数
- s
- String
表示要转换的数字的字符串。A string that represents the number to convert. 该字符串使用由 style 参数指定的样式来进行解释。The string is interpreted by using the style specified by the style parameter.
- style
- NumberStyles
枚举值的一个按位组合,指示 s 所允许的格式。A bitwise combination of enumeration values that indicates the permitted format of s. 要指定的一个典型值为 Integer。A 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.
- result
- UInt64
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 64 位无符号整数值;如果转换失败,则包含零。When this method returns, contains the 64-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 null 或 Empty、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 false。true if s was converted successfully; otherwise, false.
- 属性
例外
style 不是 NumberStyles 值。style is not a NumberStyles value.
- 或 --or-
style 不是 AllowHexSpecifier 和 HexNumber 值的组合。style is not a combination of AllowHexSpecifier and HexNumber values.
示例
下面的示例 TryParse(String, NumberStyles, IFormatProvider, UInt64) 使用多个不同的字符串和值调用方法 NumberStyles 。The following example calls the TryParse(String, NumberStyles, IFormatProvider, UInt64) method with a number of different strings and NumberStyles values.
using System;
using System.Globalization;
public class Example
{
public static void Main()
{
string numericString;
NumberStyles styles;
numericString = "2106034";
styles = NumberStyles.Integer;
CallTryParse(numericString, styles);
numericString = "-10603";
styles = NumberStyles.None;
CallTryParse(numericString, styles);
numericString = "29103674.00";
styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
CallTryParse(numericString, styles);
numericString = "10345.72";
styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
CallTryParse(numericString, styles);
numericString = "41792210E-01";
styles = NumberStyles.Integer | NumberStyles.AllowExponent;
CallTryParse(numericString, styles);
numericString = "9112E-01";
CallTryParse(numericString, styles);
numericString = "312E01";
CallTryParse(numericString, styles);
numericString = "FFC86DA1";
CallTryParse(numericString, NumberStyles.HexNumber);
numericString = "0x8F8C";
CallTryParse(numericString, NumberStyles.HexNumber);
}
private static void CallTryParse(string stringToConvert, NumberStyles styles)
{
ulong number;
bool result = UInt64.TryParse(stringToConvert, styles,
CultureInfo.InvariantCulture, out number);
if (result)
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:
// Converted '2106034' to 2106034.
// Attempted conversion of '-10603' failed.
// Converted '29103674.00' to 29103674.
// Attempted conversion of '10345.72' failed.
// Converted '41792210E-01' to 4179221.
// Attempted conversion of '9112E-01' failed.
// Converted '312E01' to 3120.
// Converted 'FFC86DA1' to 4291325345.
// Attempted conversion of '0x8F8C' failed.
Imports System.Globalization
Module Example
Public Sub Main()
Dim numericString As String
Dim styles As NumberStyles
numericString = "2106034"
styles = NumberStyles.Integer
CallTryParse(numericString, styles)
numericString = "-10603"
styles = NumberStyles.None
CallTryParse(numericString, styles)
numericString = "29103674.00"
styles = NumberStyles.Integer Or NumberStyles.AllowDecimalPoint
CallTryParse(numericString, styles)
numericString = "10345.72"
styles = NumberStyles.Integer Or NumberStyles.AllowDecimalPoint
CallTryParse(numericString, styles)
numericString = "41792210E-01"
styles = NumberStyles.Integer Or NumberStyles.AllowExponent
CallTryParse(numericString, styles)
numericString = "9112E-01"
CallTryParse(numericString, styles)
numericString = "312E01"
CallTryParse(numericString, styles)
numericString = "FFC86DA1"
CallTryParse(numericString, NumberStyles.HexNumber)
numericString = "0x8F8C"
CallTryParse(numericString, NumberStyles.HexNumber)
End Sub
Private Sub CallTryParse(stringToConvert As String, styles AS NumberStyles)
Dim number As ULong
Dim result As Boolean = UInt64.TryParse(stringToConvert, styles, _
CultureInfo.InvariantCulture, 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 '2106034' to 2106034.
' Attempted conversion of '-10603' failed.
' Converted '29103674.00' to 29103674.
' Attempted conversion of '10345.72' failed.
' Converted '41792210E-01' to 4179221.
' Attempted conversion of '9112E-01' failed.
' Converted '312E01' to 3120.
' Converted 'FFC86DA1' to 4291325345.
' Attempted conversion of '0x8F8C' failed.
注解
TryParse(String, NumberStyles, IFormatProvider, UInt64)方法与 Parse(String, NumberStyles, IFormatProvider) 方法类似,不同之处在于它不会在转换失败时引发异常。The TryParse(String, NumberStyles, IFormatProvider, UInt64) method is like the Parse(String, NumberStyles, IFormatProvider) method, except that it does not throw an exception if the conversion fails. 此方法无需使用异常处理来测试是否 FormatException s 无效,并且无法成功分析。This method eliminates the need to use exception handling to test for a FormatException if s is invalid and cannot be parsed successfully.
style参数定义 ((如空白)或正号或负号) 等样式元素,以便 s 分析操作成功。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. 它必须是枚举中的位标志的组合 NumberStyles 。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] [数字,]位数[。fractional_digits] [E [sign]exponential_digits] [ws][ws][$][sign][digits,]digits[.fractional_digits][E[sign]exponential_digits][ws]
方括号 ( [和] ) 中的项是可选的。Items in square brackets ([ and ]) are optional. 或者,如果 style 参数包含 NumberStyles.AllowHexSpecifier , s 参数可能包括以下元素:Or, if the style parameter includes NumberStyles.AllowHexSpecifier, the s parameter may include the following elements:
[ws]hexdigits[ws][ws]hexdigits[ws]
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 | 可选空白。Optional white space. 如果包含标志,则可以在的开头出现空格; s style NumberStyles.AllowLeadingWhite s 如果包含标志,则为末尾处 style NumberStyles.AllowTrailingWhite 。White space can appear at the start 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. 其在字符串中的位置由 CurrencyPositivePattern NumberFormatInfo 参数方法返回的对象的属性定义 GetFormat provider 。Its position in the string is defined by the CurrencyPositivePattern property of the NumberFormatInfo object returned by the GetFormat method of the provider parameter. s如果包含标志,则货币符号可以出现在中 style NumberStyles.AllowCurrencySymbol 。The currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag. |
| signsign | 一个可选的符号。An optional sign. 如果包含标志,则符号可以出现在的开头 s style NumberStyles.AllowLeadingSign ,如果包含标志,则它可以出现在的结尾 s style NumberStyles.AllowTrailingSign 。The sign can appear at the start of s if style includes the NumberStyles.AllowLeadingSign flag, and it can appear at the end of s if style includes the NumberStyles.AllowTrailingSign flag. 如果包含标志,则可以在中使用括号 s 来表示负值 style NumberStyles.AllowParentheses 。Parentheses can be used in s to indicate a negative value if style includes the NumberStyles.AllowParentheses flag. 但是,如果存在负号,则 s 只能表示值零,分析操作才能成功。However, if the negative sign is present, s can only represent the value zero for the parse operation to succeed. |
| 位数digits | 介于0到9之间的一系列数字。A sequence of digits from 0 through 9. |
| ,, | 区域性特定的组分隔符。A culture-specific group separator. 如果包含标志,则所指定的区域性的组分隔符 provider 可以出现在中 s style NumberStyles.AllowThousands 。The group separator of the culture specified by provider can appear in s if style includes the NumberStyles.AllowThousands flag. |
| .. | 区域性特定的小数点符号。A culture-specific decimal point symbol. 如果包含标志,则指定的区域性的小数点符号 provider 可以出现在中 s style NumberStyles.AllowDecimalPoint 。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. s仅当包含标志时,小数位才能出现在中 style NumberStyles.AllowDecimalPoint 。Fractional digits can appear in s only if style includes the NumberStyles.AllowDecimalPoint flag. |
| EE | "E" 或 "E" 字符,指示以指数 (科学) 记数法表示的值。The "e" or "E" character, which indicates that the value is represented in exponential (scientific) notation. s如果包含标志,则参数可以表示指数表示法中的数字 style NumberStyles.AllowExponent 。The s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag. |
| exponential_digitsexponential_digits | 介于0到9之间的一系列数字。A sequence of digits from 0 through 9. s如果包含标志,则参数可以表示指数表示法中的数字 style NumberStyles.AllowExponent 。The 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
s无论参数的值如何,分析操作都将忽略中任何终止的 NUL (U + 0000) 字符 style 。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 (对应于 NumberStyles.None 标记) 总是成功分析。A string with decimal digits only (which corresponds to the NumberStyles.None flag) always parses successfully. 大多数其余 NumberStyles 成员控件在此输入字符串中可能存在但并不需要存在的元素。Most of the remaining NumberStyles members control elements that may be present, but are not required to be present, in this input string. 下表指示各个成员如何 NumberStyles 影响可能出现在中的元素 s 。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 |
除了数字以外,还允许在值中使用元素Elements permitted in value in addition to digits |
|---|---|
| None | 仅十进制数字。Decimal digits only. |
| AllowDecimalPoint | 小数点 () 和 fractional_digits 元素。The decimal point (.) and fractional_digits elements. 但 fractional_digits 只能包含一个或多个0位数字,否则该方法将返回 false 。However, fractional_digits must consist of only one or more 0 digits, or the method returns false. |
| AllowExponent | "E" 或 "E" 字符(指示指数表示法)以及 exponential_digits。The "e" or "E" character, which indicates exponential notation, along with exponential_digits. 如果 s 表示指数表示法中的数字,则它不能包含非零的小数部分。If s represents a number in exponential notation, it cannot have a non-zero, fractional component. |
| AllowLeadingWhite | 开头的 ws 元素 s 。The ws element at the start of s. |
| AllowTrailingWhite | 末尾处的 ws 元素 s 。The ws element at the end of s. |
| AllowLeadingSign | 数字 前面的 sign 元素。The sign element before digits. |
| AllowTrailingSign | 数字 后的 符号 元素。The sign element after digits. |
| AllowParentheses | 用括号括起零数值的 符号 元素。The sign element in the form of parentheses enclosing a zero numeric value. |
| AllowThousands | 组分隔符 (,) 元素。The group separator (,) element. |
| AllowCurrencySymbol | 货币 ($) 元素。The currency ($) element. |
| Currency | 所有元素。All elements. 但是, s 不能表示十六进制数或以指数表示法表示的数字。However, s cannot represent a hexadecimal number or a number in exponential notation. |
| Float | 开头或结尾处的 ws 元素,在 s 的开头处进行 签名, s 小数点 () 符号。 The ws element at the start or end of s, sign at the start of s, and the decimal point (.) symbol. s参数还可以使用指数表示法。The s parameter can also use exponential notation. |
| Number | Ws、 sign、group 分隔符 (、) 和 小数点 () 元素。The ws, sign, group separator (,), and decimal point (.) elements. |
| Any | 所有元素。All elements. 但是, s 不能表示十六进制数。However, s cannot represent a hexadecimal number. |
如果 NumberStyles.AllowHexSpecifier 使用标志,则 s 必须是十六进制值。If the NumberStyles.AllowHexSpecifier flag is used, s must be a hexadecimal value. 有效的十六进制字符为0-9、A-f 和 a-f。Valid hexadecimal characters are 0-9, A-F, and a-f. 前缀(如 "0x")不受支持,导致分析操作失败。A prefix such as "0x" is not supported and causes the parse operation to fail. 中可以存在的唯一其他标志 style 是 NumberStyles.AllowLeadingWhite 和 NumberStyles.AllowTrailingWhite 。The only other flags that can be present in style are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (NumberStyles 枚举具有复合样式, HexNumber 其中包含两个空白标志。 ) (The NumberStyles enumeration has a composite style, HexNumber, that includes both white-space flags.)
备注
如果 s 是十六进制数的字符串表示形式,则它的前面不能有任何修饰 (例如 0x 或 &h) ,它将其视为十六进制数。If s is the string representation of a hexadecimal number, it cannot be preceded by any decoration (such as 0x or &h) that differentiates it as a hexadecimal number. 这将导致转换失败。This causes the conversion to fail.
provider参数是一个 IFormatProvider 实现。The provider parameter is an IFormatProvider implementation. 其 GetFormat 方法返回一个 NumberFormatInfo 对象,该对象提供有关格式的区域性特定信息 s 。Its GetFormat method returns a NumberFormatInfo object that provides culture-specific information about the format of s. provider参数可以是以下任一项:The provider parameter can be any one of the following:
一个 CultureInfo 对象,该对象表示提供格式设置信息的区域性。A CultureInfo object that represents the culture that supplies formatting information. 其 GetFormat 方法返回 NumberFormatInfo 对象,该对象提供该区域性的数字格式设置信息。Its GetFormat method returns the NumberFormatInfo object that provides numeric formatting information for that culture.
NumberFormatInfo提供数字格式设置信息的对象。A NumberFormatInfo object that provides numeric formatting information. (其实现 GetFormat 仅返回自身。 ) (Its implementation of GetFormat just returns itself.)
实现的自定义对象 IFormatProvider 。A custom object that implements IFormatProvider. 它的 GetFormat 方法实例化并返回 NumberFormatInfo 提供格式设置信息的对象。Its GetFormat method instantiates and returns the NumberFormatInfo object that provides formatting information.
如果 provider 为 null ,则 NumberFormatInfo 使用当前区域性的对象。If provider is null, the NumberFormatInfo object for the current culture is used.
另请参阅
适用于
TryParse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider, UInt64)
重要
此 API 不符合 CLS。
尝试将指定样式和区域性特定格式的数字的范围表示形式转换为其等效的 64 位无符号整数。Tries to convert the span representation of a number in a specified style and culture-specific format to its 64-bit unsigned integer 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(ReadOnlySpan<char> s, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::UInt64 % result);
public static bool TryParse (ReadOnlySpan<char> s, System.Globalization.NumberStyles style, IFormatProvider? provider, out ulong result);
[System.CLSCompliant(false)]
public static bool TryParse (ReadOnlySpan<char> s, System.Globalization.NumberStyles style, IFormatProvider provider, out ulong result);
[System.CLSCompliant(false)]
public static bool TryParse (ReadOnlySpan<char> s, System.Globalization.NumberStyles style, IFormatProvider? provider, out ulong result);
static member TryParse : ReadOnlySpan<char> * System.Globalization.NumberStyles * IFormatProvider * uint64 -> bool
[<System.CLSCompliant(false)>]
static member TryParse : ReadOnlySpan<char> * System.Globalization.NumberStyles * IFormatProvider * uint64 -> bool
Public Shared Function TryParse (s As ReadOnlySpan(Of Char), style As NumberStyles, provider As IFormatProvider, ByRef result As ULong) As Boolean
参数
- s
- ReadOnlySpan<Char>
一个范围,包含表示要转换的数字的字符。A span containing the characters that represent the number to convert. 该范围使用由 style 参数指定的样式来进行解释。The span is interpreted by using the style specified by the style parameter.
- style
- NumberStyles
枚举值的一个按位组合,指示 s 所允许的格式。A bitwise combination of enumeration values that indicates the permitted format of s. 要指定的一个典型值为 Integer。A 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.
- result
- UInt64
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 64 位无符号整数值;如果转换失败,则包含零。When this method returns, contains the 64-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 null 或 Empty、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 false。true if s was converted successfully; otherwise, false.
- 属性