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Int32.Parse Method (String, NumberStyles)

Updated: July 2008

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

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

public static int Parse(
	string s,
	NumberStyles style


Type: System.String

A string containing a number to convert.

Type: System.Globalization.NumberStyles

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

Return Value

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


s is null.


style is not a NumberStyles value.


style is not a combination of AllowHexSpecifier and HexNumber values.


s is not in a format compliant with style.


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


s includes non-zero, fractional digits.

The style parameter defines the style elements (such as white space, the positive or negative sign symbol, or the thousands separator symbol) 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:


Or, if style includes AllowHexSpecifier:


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




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.CurrencyNegativePattern and NumberFormatInfo.CurrencyPositivePattern properties of the current culture. The current culture's currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag.


An optional sign. The sign can appear at the beginning 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. Parentheses can be used in s to indicate a negative value if style includes the NumberStyles.AllowParentheses flag.




A sequence of digits from 0 through 9. For fractional_digits, only the digit 0 is valid.


A culture-specific thousands separator symbol. The current culture's thousands separator can appear in s if style includes the NumberStyles.AllowThousands flag.


A culture-specific decimal point symbol. The current culture's decimal point symbol 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.


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.


A sequence of hexadecimal digits from 0 through f, or 0 through F.

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

NumberStyles value

Elements permitted in s in addition to digits


The digits element only.


The decimal point ( . ) and fractional-digits elements.


The s parameter can also use exponential notation.


The ws element at the beginning of s.


The ws element at the end of s.


The sign element at the beginning of s.


The sign element at the end of s.


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


The thousands separator ( , ) element.


The $ element.


All. The s parameter cannot represent a hexadecimal number or a number in exponential notation.


The ws element at the beginning or end of s, sign at the beginning of s, and the decimal point ( . ) symbol. The s parameter can also use exponential notation.


The ws, sign, thousands separator ( , ), and decimal point ( . ) elements.


All styles, except s cannot represent a hexadecimal number.

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

The s parameter is parsed using the formatting information in a NumberFormatInfo object that is initialized for the current system culture. To specify the culture whose formatting information is used for the parse operation, call the Int32.Parse(String, NumberStyles, IFormatProvider) overload.

The following example uses the Int32.Parse(String, NumberStyles) method to parse the string representations of several Int32 values. The current culture for the example is en-US.

using System;
using System.Globalization;

public class ParseInt32
   public static void Main()
      Convert("104.0", NumberStyles.AllowDecimalPoint);
      Convert("104.9", NumberStyles.AllowDecimalPoint);
      Convert(" $17,198,064.42", NumberStyles.AllowCurrencySymbol |
      Convert("103E06", NumberStyles.AllowExponent);
      Convert("-1,345,791", NumberStyles.AllowThousands);
      Convert("(1,345,791)", NumberStyles.AllowThousands |

   private static void Convert(string value, NumberStyles style)
         int number = Int32.Parse(value, style);
         Console.WriteLine("Converted '{0}' to {1}.", value, number);
      catch (FormatException)
         Console.WriteLine("Unable to convert '{0}'.", value);
      catch (OverflowException)
         Console.WriteLine("'{0}' is out of range of the Int32 type.", value);   
// The example displays the following output to the console: 
//       Converted '104.0' to 104. 
//       '104.9' is out of range of the Int32 type. 
//       ' $17,198,064.42' is out of range of the Int32 type. 
//       Converted '103E06' to 103000000. 
//       Unable to convert '-1,345,791'. 
//       Converted '(1,345,791)' to -1345791.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0




July 2008

Added a condition for an OverflowException.

Information enhancement.