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

Converts the string representation of a number in a specified style and culture-specific format to its 32-bit signed integer equivalent.

Syntax

public static int Parse (string s, System.Globalization.NumberStyles style, IFormatProvider provider)

Parameters

s
A string containing a number to convert.
style
A bitwise combination of 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 containing a number to convert.
style
A bitwise combination of enumeration values that indicates the style elements that can be present in s. A typical value to specify is System.Globalization.NumberStyles.Integer.
provider
An object that supplies culture-specific information about the format of s.

Returns

A 32-bit signed integer 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 int.MaxValue or less than int.MinValue.

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

Remarks

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. 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,]digits[.fractional_digist][e[sign]exponential_digits][ws]

Or, if style includes System.Globalization.NumberStyles.AllowHexSpecifier:

[ws]hexdigits[ws]

Items 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 System.Globalization.NumberFormatInfo object returned by the IFormatProvider.GetFormat(Type) method of the provider parameter. The 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 or 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 fractional_digits exponential_digits	A sequence of digits from 0 through 9. For fractional_digits, only the digit 0 is valid.
,	A culture-specific thousands separator symbol. The thousands separator of the culture specified by provider can appear in s if style includes the System.Globalization.NumberStyles.AllowThousands flag.
.	A culture-specific decimal point symbol. The decimal point symbol of the culture specified by provider can appear in s if style includes the System.Globalization.NumberStyles.AllowDecimalPoint flag. Only the digit 0 can appear as a fractional digit for the parse operation to succeed; if fractional_digits includes any other digit, an OverflowException is thrown.
e	The 'e' or 'E' character, which indicates that the value is represented in exponential notation. 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 if it is in the range of the int type. Most of the remaining System.Globalization.NumberStyles members control elements that may be but are not required to be present in this 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, fractional-digits must consist of only one or more 0 digits or an OverflowException is thrown.
System.Globalization.NumberStyles.AllowExponent	The s parameter can also use exponential notation. If s represents a number in exponential notation, it must represent an integer within the range of the int data type without a non-zero, fractional component.
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 can appear before digits.
System.Globalization.NumberStyles.AllowTrailingSign	A positive sign can appear after digits.
System.Globalization.NumberStyles.AllowParentheses	The sign element in the form of parentheses enclosing the numeric value.
System.Globalization.NumberStyles.AllowThousands	The thousands separator ( , ) element.
System.Globalization.NumberStyles.AllowCurrencySymbol	The $ element.

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

The provider parameter is an IFormatProvider implementation, such as a System.Globalization.NumberFormatInfo or System.Globalization.CultureInfo object. The provider parameter supplies culture-specific information used in parsing. If provider is null, the System.Globalization.NumberFormatInfo object for the current culture is used.

Requirements

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