Parse Method (String, IFormatProvider)

UInt32.Parse Method (String, IFormatProvider)


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

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

public static uint Parse(
	string s,
	IFormatProvider provider


Type: System.String

A string that represents the number to convert.

Type: System.IFormatProvider

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

Return Value

Type: System.UInt32

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

Exception Condition

s is null.


s is not in the correct style.


s represents a number that is less than UInt32.MinValue or greater than UInt32.MaxValue.

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, or a negative sign if s represents the value zero.


A sequence of digits ranging from 0 to 9.

The s parameter is interpreted using the NumberStyles.Integer style. In addition to the unsigned integer value's decimal digits, only leading and trailing spaces along with a leading sign is allowed. (If the negative sign is present, s must represent a value of zero, or the method throws an OverflowException.) To explicitly define the style elements together with the culture-specific formatting information that can be present in s, use the Parse(String, NumberStyles, IFormatProvider) method.

The provider parameter is an IFormatProvider implementation whose GetFormat method returns a NumberFormatInfo object that provides culture-specific information about the format of s. There are three ways to use the provider parameter to supply custom formatting information to the parse operation:

  • You can pass the actual NumberFormatInfo object that provides formatting information. (Its implementation of GetFormat simply returns itself.)

  • You can pass a CultureInfo object that specifies the culture whose formatting is to be used. Its NumberFormat property provides formatting information.

  • You can pass a custom IFormatProvider implementation. Its GetFormat method must instantiate and return the NumberFormatInfo object that provides formatting information.

If provider is null, the NumberFormatInfo 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 a UInt32 value.

protected void OkToUInteger_Click(object sender, EventArgs e)
   string locale;
   uint 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 = UInt32.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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