SByte.TryParse SByte.TryParse SByte.TryParse SByte.TryParse Method

Definition

Converts the string representation of a number to its 8-bit signed integer equivalent. A return code indicates whether the conversion succeeded or failed.

Overloads

TryParse(String, SByte) TryParse(String, SByte) TryParse(String, SByte) TryParse(String, SByte)

Tries to convert the string representation of a number to its SByte equivalent, and returns a value that indicates whether the conversion succeeded.

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

Tries to convert the string representation of a number in a specified style and culture-specific format to its SByte equivalent, and returns a value that indicates whether the conversion succeeded.

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

TryParse(String, SByte) TryParse(String, SByte) TryParse(String, SByte) TryParse(String, SByte)

Important

This API is not CLS-compliant.

Tries to convert the string representation of a number to its SByte equivalent, and returns a value that indicates whether the conversion succeeded.

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

Parameters

s
String String String String

A string that contains a number to convert.

result
SByte SByte SByte SByte

When this method returns, contains the 8-bit signed integer value that is equivalent to the number contained in s if the conversion succeeded, or zero if the conversion failed. The conversion fails if the s parameter is null or Empty, is not in the correct format, or represents a number that is less than MinValue or greater than MaxValue. This parameter is passed uninitialized; any value originally supplied in result will be overwritten.

Returns

true if s was converted successfully; otherwise, false.

Examples

The following example tries to convert the strings in an array to SByte values by calling the TryParse(String, SByte) method.

string[] numericStrings = {"-3.6", "12.8", "+16.7", "    3   ", "(17)", 
                           "-17", "+12", "18-", "987", "1,024", "  127 "};
sbyte number;
foreach (string numericString in numericStrings)
{
   if (sbyte.TryParse(numericString, out number)) 
      Console.WriteLine("Converted '{0}' to {1}.", numericString, number);
   else
      Console.WriteLine("Cannot convert '{0}' to an SByte.", numericString);
}
// The example displays the following output to the console:
//       Cannot convert '-3.6' to an SByte.
//       Cannot convert '12.8' to an SByte.
//       Cannot convert '+16.7' to an SByte.
//       Converted '    3   ' to 3.
//       Cannot convert '(17)' to an SByte.
//       Converted '-17' to -17.
//       Converted '+12' to 12.
//       Cannot convert '18-' to an SByte.
//       Cannot convert '987' to an SByte.
//       Cannot convert '1,024' to an SByte.
//       Converted '  127 ' to 127.
Dim numericStrings() As String = {"-3.6", "12.8", "+16.7", "    3   ", _
                                  "(17)", "-17", "+12", "18-", "987", _
                                  "1,024", "  127 "}
Dim number As SByte
For Each numericString As String In numericStrings
   If SByte.TryParse(numericString, number) Then
      Console.WriteLine("Converted '{0}' to {1}.", numericString, number)
   Else
      Console.WriteLine("Cannot convert '{0}' to an SByte.", numericString)
   End If      
Next
' The example displays the following output to the console:
'       Cannot convert '-3.6' to an SByte.
'       Cannot convert '12.8' to an SByte.
'       Cannot convert '+16.7' to an SByte.
'       Converted '    3   ' to 3.
'       Cannot convert '(17)' to an SByte.
'       Converted '-17' to -17.
'       Converted '+12' to 12.
'       Cannot convert '18-' to an SByte.
'       Cannot convert '987' to an SByte.
'       Cannot convert '1,024' to an SByte.
'       Converted '  127 ' to 127.

Remarks

The SByte.TryParse(String, SByte) method is like the SByte.Parse(String) method, except that it does not throw an exception if the conversion fails. This method eliminates the need to use exception handling to test for a FormatException if value is invalid and cannot be successfully parsed.

The s parameter should be the string representation of a decimal number in the following form:

[ws][sign]digits[ws]

Elements in square brackets ([ and ]) are optional. The following table describes each element.

Element Description
ws Optional white space.
sign An optional sign. Valid sign characters are determined by the NumberFormatInfo.NegativeSign and NumberFormatInfo.PositiveSign properties of the current culture.
digits A sequence of decimal digits ranging from 0 to 9.

Note

The string specified by the value parameter cannot contain any group separators or decimal separator, and it cannot have a decimal portion.

The s parameter is interpreted by using the NumberStyles.Integer style. In addition to the decimal digits, only leading and trailing spaces with a leading sign are allowed. To explicitly define the style elements with the culture-specific formatting information that can be present in value, call the TryParse(String, NumberStyles, IFormatProvider, SByte) method.

The s parameter is parsed by using the formatting information in a NumberFormatInfo object for the current culture. For more information, see NumberFormatInfo.CurrentInfo.

This overload interprets all digits in the value parameter as decimal digits. To parse the string representation of a hexadecimal number, call the TryParse(String, NumberStyles, IFormatProvider, SByte) overload instead.

See also

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

Important

This API is not CLS-compliant.

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

Parameters

Returns

TryParse(String, NumberStyles, IFormatProvider, SByte) TryParse(String, NumberStyles, IFormatProvider, SByte) TryParse(String, NumberStyles, IFormatProvider, SByte) TryParse(String, NumberStyles, IFormatProvider, SByte)

Important

This API is not CLS-compliant.

CLS-compliant alternative
System.Int16.TryParse(String, Int16)

Tries to convert the string representation of a number in a specified style and culture-specific format to its SByte equivalent, and returns a value that indicates whether the conversion succeeded.

public:
 static bool TryParse(System::String ^ s, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::SByte % result);
[System.CLSCompliant(false)]
public static bool TryParse (string s, System.Globalization.NumberStyles style, IFormatProvider provider, out sbyte 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 SByte) As Boolean

Parameters

s
String String String String

A string representing a number to convert.

style
NumberStyles NumberStyles NumberStyles NumberStyles

A bitwise combination of enumeration values that indicates the permitted format of s. A typical value to specify is Integer.

provider
IFormatProvider IFormatProvider IFormatProvider IFormatProvider

An object that supplies culture-specific formatting information about s.

result
SByte SByte SByte SByte

When this method returns, contains the 8-bit signed integer value equivalent to the number contained in s, if the conversion succeeded, or zero if the conversion failed. 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. This parameter is passed uninitialized; any value originally supplied in result will be overwritten.

Returns

true if s was converted successfully; otherwise, false.

Exceptions

style is not a NumberStyles value.

-or-

style is not a combination of AllowHexSpecifier and HexNumber values.

Examples

The following example calls the TryParse(String, NumberStyles, IFormatProvider, SByte) method with a number of different string and NumberStyles values.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string numericString;
      NumberStyles styles;
      
      numericString = "106";
      styles = NumberStyles.Integer;
      CallTryParse(numericString, styles);
      
      numericString = "-106";
      styles = NumberStyles.None;
      CallTryParse(numericString, styles);
      
      numericString = "103.00";
      styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
      CallTryParse(numericString, styles);
      
      numericString = "103.72";
      styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
      CallTryParse(numericString, styles);

      numericString = "10E-01";
      styles = NumberStyles.Integer | NumberStyles.AllowExponent;
      CallTryParse(numericString, styles); 
      
      numericString = "12E-01";
      CallTryParse(numericString, styles);
          
      numericString = "12E01";
      CallTryParse(numericString, styles); 
      
      numericString = "C8";
      CallTryParse(numericString, NumberStyles.HexNumber);
      
      numericString = "0x8C";
      CallTryParse(numericString, NumberStyles.HexNumber);
   }
   
   private static void CallTryParse(string stringToConvert, NumberStyles styles)
   {
      sbyte number;
      bool result = SByte.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 '106' to 106.
//       Attempted conversion of '-106' failed.
//       Converted '103.00' to 103.
//       Attempted conversion of '103.72' failed.
//       Converted '10E-01' to 1.
//       Attempted conversion of '12E-01' failed.
//       Converted '12E01' to 120.
//       Converted 'C8' to -56.
//       Attempted conversion of '0x8C' failed.
Imports System.Globalization

Module StringParsing
   Public Sub Main()
      Dim numericString As String
      Dim styles As NumberStyles
      
      numericString = "106"
      styles = NumberStyles.Integer
      CallTryParse(numericString, styles)
      
      numericString = "-106"
      styles = NumberStyles.None
      CallTryParse(numericString, styles)
      
      numericString = "103.00"
      styles = NumberStyles.Integer Or NumberStyles.AllowDecimalPoint
      CallTryParse(numericString, styles)
      
      numericString = "103.72"
      styles = NumberStyles.Integer Or NumberStyles.AllowDecimalPoint
      CallTryParse(numericString, styles)

      numericString = "10E-01"
      styles = NumberStyles.Integer Or NumberStyles.AllowExponent
      CallTryParse(numericString, styles) 
      
      numericString = "12E-01"
      CallTryParse(numericString, styles)
          
      numericString = "12E01"
      CallTryParse(numericString, styles) 
      
      numericString = "C8"
      CallTryParse(numericString, NumberStyles.HexNumber)
      
      numericString = "0x8C"
      CallTryParse(numericString, NumberStyles.HexNumber)
   End Sub
   
   Private Sub CallTryParse(stringToConvert As String, styles AS NumberStyles)
      Dim number As SByte
      Dim result As Boolean = SByte.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 '106' to 106.
'       Attempted conversion of '-106' failed.
'       Converted '103.00' to 103.
'       Attempted conversion of '103.72' failed.
'       Converted '10E-01' to 1.
'       Attempted conversion of '12E-01' failed.
'       Converted '12E01' to 120.
'       Converted 'C8' to -56.
'       Attempted conversion of '0x8C' failed.

Remarks

The TryParse(String, NumberStyles, IFormatProvider, SByte) method is like the Parse(String, NumberStyles, IFormatProvider) method, except that it does not throw an exception if the conversion fails. This method eliminates the need to use exception handling to test for a FormatException if value is invalid and cannot be parsed successfully.

The style parameter defines the style elements (such as white space or a positive or negative sign) that are allowed in the value parameter for the parse operation to succeed. It must be a combination of bit flags from the NumberStyles enumeration. Depending on the value of style, the value parameter may include the following elements:

[ws][$][sign][digits,]digits[.fractional_digits][E[sign]exponential_digits][ws]

If the style parameter includes AllowHexSpecifier, the value parameter may include the following elements:

[ws]hexdigits[ws]

Elements in square brackets ([ and ]) are optional. The following table describes each element.

Element Description
ws Optional white space. White space can appear at the start of value if style includes the NumberStyles.AllowLeadingWhite flag, or at the end of value if style includes the NumberStyles.AllowTrailingWhite flag.
$ A culture-specific currency symbol. Its position in the string is defined by the CurrencyPositivePattern property of the NumberFormatInfo object returned by the GetFormat method of the provider parameter. The currency symbol can appear in value if style includes the NumberStyles.AllowCurrencySymbol flag.
sign An optional sign. The sign can appear at the start of value if style includes the NumberStyles.AllowLeadingSign flag, and it can appear at the end of value if style includes the NumberStyles.AllowTrailingSign flag. Parentheses can be used in value to indicate a negative value if style includes the NumberStyles.AllowParentheses flag.
digits A sequence of digits from 0 through 9.
, A culture-specific group separator. The group separator of the culture specified by provider can appear in value if style includes the NumberStyles.AllowThousands flag.
. A culture-specific decimal point symbol. The decimal point symbol of the culture specified by provider can appear in value if style includes the NumberStyles.AllowDecimalPoint flag.
fractional_digits One or more occurrences of the digit 0. Fractional digits can appear in value only if style includes the NumberStyles.AllowDecimalPoint flag.
E The "e" or "E" character, which indicates that the value is represented in exponential (scientific) notation. The value parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag.
exponential_digits A sequence of digits from 0 through 9. The value parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag.
hexdigits A sequence of hexadecimal digits from 0 through f, or 0 through F.

Note

Any terminating NUL (U+0000) characters in s are ignored by the parsing operation, regardless of the value of the style argument.

A string with decimal digits only (which corresponds to the NumberStyles.None flag) always parses successfully. Most of the remaining NumberStyles members control elements that may be present, but are not required to be present, in this input string. The following table indicates how individual NumberStyles members affect the elements that may be present in value.

Non-composite NumberStyles values Elements permitted in value in addition to digits
None Decimal digits only.
AllowDecimalPoint The decimal point (.) and fractional_digits elements. However, fractional_digits must consist of only one or more 0 digits, or the method returns false.
AllowExponent The "e" or "E" character, which indicates exponential notation, along with exponential_digits. If value represents a number in exponential notation, it cannot have a non-zero, fractional component.
AllowLeadingWhite The ws element at the start of value.
AllowTrailingWhite The ws element at the end of value.
AllowLeadingSign The sign element before digits.
AllowTrailingSign The sign element after digits.
AllowParentheses The sign element in the form of parentheses enclosing the numeric value.
AllowThousands The group separator (,) element.
AllowCurrencySymbol The currency ($) element.
Currency All elements. However, value cannot represent a hexadecimal number or a number in exponential notation.
Float The ws element at the start or end of value, sign at the start of value, and the decimal point (.) symbol. The value parameter can also use exponential notation.
Number The ws, sign, group separator (,), and decimal point (.) elements.
Any All elements. However, value cannot represent a hexadecimal number.

If the NumberStyles.AllowHexSpecifier flag is used, value must be a hexadecimal value. Valid hexadecimal digits are 0-9, a-f, and A-F. The only other flags that can be present in style are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (The NumberStyles enumeration has a composite style, HexNumber, that includes both white-space flags.)

Note

If value 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. This causes the conversion to fail.

The provider parameter is an IFormatProvider implementation. Its GetFormat method returns a NumberFormatInfo object that provides culture-specific information about the format of value. The provider parameter can be any one of the following:

If provider is null, the NumberFormatInfo object for the current culture is used.

See also

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

Important

This API is not CLS-compliant.

public:
 static bool TryParse(ReadOnlySpan<char> s, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::SByte % result);
[System.CLSCompliant(false)]
public static bool TryParse (ReadOnlySpan<char> s, System.Globalization.NumberStyles style, IFormatProvider provider, out sbyte 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 SByte) As Boolean

Parameters

Returns

Applies to