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Byte.TryParse Method (String, Byte%)

April 12, 2014

Tries to convert the string representation of a number to its Byte equivalent, and returns a value that indicates whether the conversion succeeded.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
public static bool TryParse(
	string s,
	out byte result
)

Parameters

s
Type: System.String
A string that contains a number to convert. The string is interpreted using the Integer style.
result
Type: System.Byte %
When this method returns, contains the Byte value equivalent to the number contained in s if the conversion succeeded, or zero if the conversion failed. This parameter is passed uninitialized.

Return Value

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

The conversion fails and the method returns false if the s parameter is not in the correct format, if it is null, or if it represents a number less than MinValue or greater than MaxValue.

The Byte.TryParse(String, Byte) method is similar to the Byte.Parse(String) method, except that TryParse(String, Byte) does not throw an exception if the conversion fails.

The s parameter should be the string representation of a 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 positive sign, as specified by the NumberFormatInfo.PositiveSign property of the current culture.

digits

A sequence of decimal digits that range from 0 to 9.

The s parameter is interpreted using the 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 together with the culture-specific formatting information that can be present in s, use the Byte.Parse(String, NumberStyles, IFormatProvider) method.

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

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

The following example calls the TryParse(String, Byte) method with a number of different string values.


using System;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      string byteString = null;
      CallTryParse(outputBlock, byteString);

      byteString = String.Empty;
      CallTryParse(outputBlock, byteString);

      byteString = "1024";
      CallTryParse(outputBlock, byteString);

      byteString = "100.1";
      CallTryParse(outputBlock, byteString);

      byteString = "100";
      CallTryParse(outputBlock, byteString);

      byteString = "+100";
      CallTryParse(outputBlock, byteString);

      byteString = "-100";
      CallTryParse(outputBlock, byteString);

      byteString = "000000000000000100";
      CallTryParse(outputBlock, byteString);

      byteString = "00,100";
      CallTryParse(outputBlock, byteString);

      byteString = "   20   ";
      CallTryParse(outputBlock, byteString);

      byteString = "FF";
      CallTryParse(outputBlock, byteString);

      byteString = "0x1F";
      CallTryParse(outputBlock, byteString);
   }

   private static void CallTryParse(System.Windows.Controls.TextBlock outputBlock, string stringToConvert)
   {
      byte byteValue;
      bool result = Byte.TryParse(stringToConvert, out byteValue);
      if (result)
      {
         outputBlock.Text += String.Format("Converted '{0}' to {1}",
                        stringToConvert, byteValue) + "\n";
      }
      else
      {
         if (stringToConvert == null) stringToConvert = "";
         outputBlock.Text += String.Format("Attempted conversion of '{0}' failed.",
                           stringToConvert.ToString()) + "\n";
      }
   }
}
// The example displays the following output:
//       Attempted conversion of '' failed.
//       Attempted conversion of '' failed.
//       Attempted conversion of '1024' failed.
//       Attempted conversion of '100.1' failed.
//       Converted '100' to 100
//       Converted '+100' to 100
//       Attempted conversion of '-100' failed.
//       Converted '000000000000000100' to 100
//       Attempted conversion of '00,100' failed.
//       Converted '   20   ' to 20
//       Attempted conversion of 'FF' failed.
//       Attempted conversion of '0x1F' failed.


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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