Int32.Parse Method (String)

The s parameter contains a number of the form:

[ws][sign]digits[ws]

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

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 either the Int32.Parse(String, NumberStyles) or the Int32.Parse(String, NumberStyles, IFormatProvider) method.

The s parameter is parsed using the formatting information in a NumberFormatInfo object initialized for the current system culture. For more information, see CurrentInfo. To parse a string using the formatting information of some other culture, use the Int32.Parse(String, NumberStyles, IFormatProvider) method.

The following example demonstrates how to convert a string value into a 32-bit signed integer value using the Int32.Parse(String) method. The resulting integer value is then displayed to the console.

using System;

public class ParseInt32
{
   public static void Main()
   {
      Convert("  179  ");
      Convert(" -204 ");
      Convert(" +809 ");
      Convert("  178.3");
   }

   private static void Convert(string value)
   {
      try
      {
         int number = Int32.Parse(value);
         Console.WriteLine("Converted '{0}' to {1}.", value, number);
      }
      catch (FormatException)
      {
         Console.WriteLine("Unable to convert '{0}'.", value);
      }
   }
}
// This example displays the following output to the console: 
//       Converted '  179  ' to 179. 
//       Converted ' -204 ' to -204. 
//       Converted ' +809 ' to 809. 
//       Unable to convert '  178.3'.

.NET Framework

.NET Framework Client Profile

Portable Class Library

.NET for Windows Store apps

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.

Reference

Other Resources