Parse(System.String,System.Globalization.NumberStyles)

Converts the string representation of a number in a specified style to its 8-bit signed integer equivalent.

Syntax

[System.CLSCompliant(false)]
public static sbyte Parse (string s, System.Globalization.NumberStyles style)

Parameters

s
A string that contains a number to convert. The string is interpreted using the style specified by style.
style
A bitwise combination of the enumeration values that indicates the style elements that can be present in s. A typical value to specify is System.Globalization.NumberStyles.Integer.
s
A string that contains a number to convert. The string is interpreted using the style specified by style.
style
A bitwise combination of the enumeration values that indicates the style elements that can be present in s. A typical value to specify is System.Globalization.NumberStyles.Integer.

Returns

An 8-bit signed integer that is equivalent to the number specified in s.

Exceptions

Type Reason
ArgumentNullException s is a null reference.
FormatException s is not in the correct style.
OverflowException s represents a number greater than sbyte.MaxValue or less than sbyte.MinValue.

Type	Reason
ArgumentNullException	s is a null reference.
FormatException	s is not in the correct style.
OverflowException	s represents a number greater than sbyte.MaxValue or less than sbyte.MinValue.

Remarks

The style parameter defines the style elements (such as white space or the positive or negative sign symbol) that are allowed in the s parameter for the parse operation to succeed. It must be a combination of bit flags from the System.Globalization.NumberStyles enumeration.

Depending on the value of style, the s parameter may include the following elements:

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

If style includes System.Globalization.NumberStyles.AllowHexSpecifier, the s parameter may contain the following elements:

[ws]hexdigits[ws]

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


ws	Optional white space. White space can appear at the beginning of s if style includes the System.Globalization.NumberStyles.AllowLeadingWhite flag, and it can appear at the end of s if style includes the System.Globalization.NumberStyles.AllowTrailingWhite flag.
$	A culture-specific currency symbol. Its position in the string is defined by the System.Globalization.NumberFormatInfo.CurrencyPositivePattern property of the current culture. The current culture's currency symbol can appear in s if style includes the System.Globalization.NumberStyles.AllowCurrencySymbol flag.
sign	An optional sign. The sign can appear at the beginning of s if style includes the System.Globalization.NumberStyles.AllowLeadingSign flag, and it can appear at the end of s if style includes the System.Globalization.NumberStyles.AllowTrailingSign flag. Parentheses can be used in s to indicate a negative value if style includes the System.Globalization.NumberStyles.AllowParentheses flag.
digits	A sequence of digits from 0 through 9.
.	A culture-specific decimal point symbol. The current culture's decimal point symbol can appear in s if style includes the System.Globalization.NumberStyles.AllowDecimalPoint flag.
fractional_digits	One or more occurrences of the digit 0-9 if style includes the System.Globalization.NumberStyles.AllowExponent flag, or one or more occurrences of the digit 0 if it does not. Fractional digits can appear in s only if style includes the System.Globalization.NumberStyles.AllowDecimalPoint flag.
E	The "e" or "E" character, which indicates that the value is represented in exponential (scientific) notation. The s parameter can represent a number in exponential notation if style includes the System.Globalization.NumberStyles.AllowExponent flag.
exponential_digits	One or more occurrences of the digit 0-9. The s parameter can represent a number in exponential notation if style includes the System.Globalization.NumberStyles.AllowExponent flag.
hexdigits	A sequence of hexadecimal digits from 0 through f, or 0 through F.

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


System.Globalization.NumberStyles.None	Decimal digits only.
System.Globalization.NumberStyles.AllowDecimalPoint	The decimal point (.) and fractional_digits elements. However, if style does not include the System.Globalization.NumberStyles.AllowExponent flag, fractional_digits must consist of only one or more 0 digits; otherwise, an OverflowException is thrown.
System.Globalization.NumberStyles.AllowExponent	The "e" or "E" character, which indicates exponential notation, along with exponential_digits.
System.Globalization.NumberStyles.AllowLeadingWhite	The ws element at the beginning of s.
System.Globalization.NumberStyles.AllowTrailingWhite	The ws element at the end of s.
System.Globalization.NumberStyles.AllowLeadingSign	A positive sign before digits.
System.Globalization.NumberStyles.AllowTrailingSign	A positive sign after digits.
System.Globalization.NumberStyles.AllowParentheses	The sign element in the form of parentheses enclosing the numeric value.
System.Globalization.NumberStyles.AllowThousands	The group separator (,) element. Although the group separator can appear in s, it must be preceded by only one or more 0 digits.
System.Globalization.NumberStyles.AllowCurrencySymbol	The currency ($) element.

If the System.Globalization.NumberStyles.AllowHexSpecifier flag is used, s must be a hexadecimal value. The only other flags that can be combined with it are System.Globalization.NumberStyles.AllowLeadingWhite and System.Globalization.NumberStyles.AllowTrailingWhite. (The System.Globalization.NumberStyles enumeration includes a composite number style, System.Globalization.NumberStyles.HexNumber, that includes both white-space flags.)

Note:

If the s parameter 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 parse operation to throw an exception.

If s represents a hexadecimal number, the byte.Parse(string, System.Globalization.NumberStyles) method interprets the high-order bit of the byte as a sign bit.

The s parameter is parsed by using the formatting information in a System.Globalization.NumberFormatInfo object that is initialized for the current system culture. To use the formatting information of some other culture, call the sbyte.Parse(string, System.Globalization.NumberStyles, IFormatProvider) overload.

Requirements

Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0