Artigo
11/18/2011

Byte.Parse Method (String)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Converts the string representation of a number to its Byte equivalent.

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

Syntax

'Declaration
Public Shared Function Parse ( _
    s As String _
) As Byte

public static byte Parse(
    string s
)

Parameters

s
Type: System.String
A string containing a number to convert. The string is interpreted using the Integer style.

Return Value

Type: System.Byte
The Byte value equivalent to the number contained in s.

Exceptions

Exception	Condition
ArgumentNullException	s is nulla null reference (Nothing in Visual Basic).
FormatException	s is not of the correct format.
OverflowException	s represents a number less than MinValue or greater than MaxValue.

Remarks

The s parameter contains a number of the 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 positive or negative sign.
digits	A sequence of digits ranging from 0 to 9.

The s parameter is interpreted using the NumberStyles.Integer style. In addition to the byte value's decimal digits, only leading and trailing spaces together with a leading sign are allowed. (If the sign is present, it must be a positive sign or the method throws an OverflowException.) To explicitly define the style elements that can be present in s, use either the Byte.Parse(String, NumberStyles) or the Byte.Parse(String, NumberStyles, IFormatProvider) method.

The s parameter is parsed using the formatting information in a NumberFormatInfo object that is 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 Byte.Parse(String, NumberStyles, IFormatProvider) method.

Examples

The following example demonstrates how to convert a string value into a byte value using the Byte.Parse(String) method. The resulting byte value is then displayed to the console.

Dim stringToConvert As String = " 162"
Dim byteValue As Byte
Try
   byteValue = Byte.Parse(stringToConvert)
   outputBlock.Text &= String.Format("Converted '{0}' to {1}.", stringToConvert, byteValue) & vbCrLf
Catch e As FormatException
   outputBlock.Text &= String.Format("Unable to parse '{0}'.", stringToConvert) & vbCrLf
Catch e As OverflowException
   outputBlock.Text &= String.Format("'{0}' is greater than {1} or less than {2}.", _
                     stringToConvert, Byte.MaxValue, Byte.MinValue) & vbCrLf
End Try
' The example displays the following output:
'       Converted ' 162' to 162.

string stringToConvert = " 162";
byte byteValue;
try
{
   byteValue = Byte.Parse(stringToConvert);
   outputBlock.Text += String.Format("Converted '{0}' to {1}.", stringToConvert, byteValue) + "\n";
}
catch (FormatException)
{
   outputBlock.Text += String.Format("Unable to parse '{0}'.", stringToConvert) + "\n";
}
catch (OverflowException)
{
   outputBlock.Text += String.Format("'{0}' is greater than {1} or less than {2}.",
                     stringToConvert, Byte.MaxValue, Byte.MinValue) + "\n";
}
// The example displays the following output:
//       Converted ' 162' to 162.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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