Parse Method (String, IFormatProvider)

Int32.Parse Method (String, IFormatProvider)


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

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

public static int Parse(
	string s,
	IFormatProvider provider


Type: System.String

A string containing a number to convert.

Type: System.IFormatProvider

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

Return Value

Type: System.Int32

A 32-bit signed integer equivalent to the number specified in s.

Exception Condition

s is null.


s is not of the correct format.


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

This overload of the Parse(String, IFormatProvider) method is typically used to convert text that can be formatted in a variety of ways to an Int32 value. For example, it can be used to convert the text entered by a user into an HTML text box to a numeric value.

The s parameter contains a number of the form:


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




Optional white space.


An optional sign.


A sequence of digits ranging from 0 to 9.

The s parameter is interpreted using the NumberStyles.Integer style. In addition to decimal digits, only leading and trailing spaces together with a leading sign are allowed. To explicitly define the style elements that can be present in s, use the Int32.Parse(String, NumberStyles, IFormatProvider) method.

The provider parameter is an IFormatProvider implementation, such as a NumberFormatInfo or CultureInfo object. The provider parameter supplies culture-specific information about the format of s. If provider is null, the NumberFormatInfo object for the current culture is used.

The following example is the button click event handler of a Web form. It uses the array returned by the HttpRequest.UserLanguages property to determine the user's locale. It then instantiates a CultureInfo object that corresponds to that locale. The NumberFormatInfo object that belongs to that CultureInfo object is then passed to the Parse(String, IFormatProvider) method to convert the user's input to an Int32 value.

protected void OkToInteger_Click(object sender, EventArgs e)
   string locale;
   int number;
   CultureInfo culture;

   // Return if string is empty
   if (String.IsNullOrEmpty(this.inputNumber.Text))

   // Get locale of web request to determine possible format of number
   if (Request.UserLanguages.Length == 0)
   locale = Request.UserLanguages[0];
   if (String.IsNullOrEmpty(locale))

  // Instantiate CultureInfo object for the user's locale
   culture = new CultureInfo(locale);

   // Convert user input from a string to a number
      number = Int32.Parse(this.inputNumber.Text, culture.NumberFormat);
   catch (FormatException)
   catch (Exception)
   // Output number to label on web form
   this.outputNumber.Text = "Number is " + number.ToString();

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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