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Int32.Parse Method (String, NumberStyles, IFormatProvider)

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

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

static member Parse : 
        s:string * 
        style:NumberStyles * 
        provider:IFormatProvider -> int

Parameters

s
Type: System.String

A string containing a number to convert.

style
Type: System.Globalization.NumberStyles

A bitwise combination of enumeration values that indicates the style elements that can be present in s. A typical value to specify is Integer.

provider
Type: System.IFormatProvider

An object that supplies culture-specific information about the format of s.

Return Value

Type: System.Int32
A 32-bit signed integer equivalent to the number specified in s.

ExceptionCondition
ArgumentNullException

s is a null reference (Nothing in Visual Basic).

ArgumentException

style is not a NumberStyles value.

-or-

style is not a combination of AllowHexSpecifier and HexNumber values.

FormatException

s is not in a format compliant with style.

OverflowException

s represents a number less than MinValue or greater than MaxValue.

-or-

s includes non-zero, fractional digits.

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 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 AllowHexSpecifier:

[ws]hexdigits[ws]

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

Element

Description

ws

Optional white space. White space can appear at the beginning of s if style includes the NumberStyles.AllowLeadingWhite flag, and it can appear at the end of s if style includes the NumberStyles.AllowTrailingWhite flag.

$

A culture-specific currency symbol. 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. The currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag.

sign

An optional sign. 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. Parentheses can be used in s to indicate a negative value if style includes the 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 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 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 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 NumberStyles.None style) always parses successfully if it is in the range of the Int32 type. Most of the remaining NumberStyles members control elements that may be 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 s.

Non-composite NumberStyles values

Elements permitted in s in addition to digits

NumberStyles.None

Decimal digits only.

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.

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 Int32 data type without a non-zero, fractional component.

NumberStyles.AllowLeadingWhite

The ws element at the beginning of s.

NumberStyles.AllowTrailingWhite

The ws element at the end of s.

NumberStyles.AllowLeadingSign

A positive sign can appear before digits.

NumberStyles.AllowTrailingSign

A positive sign can appear after digits.

NumberStyles.AllowParentheses

The sign element in the form of parentheses enclosing the numeric value.

NumberStyles.AllowThousands

The thousands separator ( , ) element.

NumberStyles.AllowCurrencySymbol

The $ element.

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

The provider parameter is an IFormatProvider implementation, such as a NumberFormatInfo or CultureInfo object. The provider parameter supplies culture-specific information used in parsing. If provider is a null reference (Nothing in Visual Basic), the NumberFormatInfo object for the current culture is used.

The following example uses a variety of style and provider parameters to parse the string representations of Int32 values. It also illustrates some of the different ways the same string can be interpreted depending on the culture whose formatting information is used for the parsing operation.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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