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UInt32.TryParse Method (String, UInt32%)

Updated: May 2010

Tries to convert the string representation of a number to its 32-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed.

This API is not CLS-compliant. The CLS-compliant alternative is TryParse(String, Int64).

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

[CLSCompliantAttribute(false)]
public static bool TryParse(
	string s,
	out uint result
)

Parameters

s
Type: System.String

A string that represents the number to convert.

result
Type: System.UInt32%

When this method returns, contains the 32-bit unsigned integer value that is equivalent to the number contained in s, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the s parameter is null, is not of the correct format, or represents a number less than UInt32.MinValue or greater than UInt32.MaxValue. This parameter is passed uninitialized.

Return Value

Type: System.Boolean
true if s was converted successfully; otherwise, false.

The TryParse method is like the Parse method, except that it does not throw an exception if the conversion fails. This method eliminates the need to use exception handling to test for a FormatException if s is invalid and cannot be successfully parsed.

The s parameter should be the string representation of a decimal number in the following form:

[ws][sign]digits[ws]

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

Element

Description

ws

Optional white space.

sign

An optional sign. Valid sign characters are determined by the NumberFormatInfo.NegativeSign and NumberFormatInfo.PositiveSign properties of the current culture.

digits

A sequence of decimal digits ranging from 0 to 9.

The s parameter is interpreted by using the NumberStyles.Integer style. In addition to the decimal digits, only leading and trailing spaces with a leading sign are allowed. To explicitly define the style elements with the culture-specific formatting information that can be present in s, call the TryParse(String, NumberStyles, IFormatProvider, UInt32) method.

NoteNote:

The string specified by the s parameter cannot contain any group separators or decimal separator, and it cannot have a fractional portion.

The s parameter is parsed by using the formatting information in a NumberFormatInfo object for the current system culture. For more information, see NumberFormatInfo.CurrentInfo.

This overload interprets all digits in the s parameter as decimal digits. To parse the string representation of a hexadecimal number, call the TryParse(String, NumberStyles, IFormatProvider, UInt32) overload instead.

The following example calls the TryParse(String, UInt32) method once for each element in a string array.

string[] numericStrings = { "1293.8", "+1671.7", "28347.", 
                            "   33113684  ", "(0)", "-0", "+1293617", 
                            "18-", "119870", "31,024", "  3127094 ",  
                            "00700000" };
uint number;
foreach (string numericString in numericStrings)
{
   if (UInt32.TryParse(numericString, out number)) 
      Console.WriteLine("Converted '{0}' to {1}.", numericString, number);
   else
      Console.WriteLine("Cannot convert '{0}' to a UInt32.", numericString);
}
// The example displays the following output: 
//       Cannot convert '1293.8' to a UInt32. 
//       Cannot convert '+1671.7' to a UInt32. 
//       Cannot convert '28347.' to a UInt32. 
//       Converted '   33113684  ' to 33113684. 
//       Cannot convert '(0)' to a UInt32. 
//       Converted '-0' to 0. 
//       Converted '+1293617' to 1293617. 
//       Cannot convert '18-' to a UInt32. 
//       Converted '119870' to 119870. 
//       Cannot convert '31,024' to a UInt32. 
//       Converted '  3127094 ' to 3127094. 
//       Converted '0070000' to 70000.

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

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

Date

History

Reason

May 2010

Revised extensively.

Information enhancement.

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