Byte.TryParse Method (String, NumberStyles, IFormatProvider, Byte%)

Parameters

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

• style
  Type: System.Globalization.NumberStyles
  A bitwise combination of NumberStyles values that indicates the style elements that can be present in s. A typical value to specify is Integer.

• provider
  Type: System.IFormatProvider
  An IFormatProvider object that supplies culture-specific formatting information about s. If provider is nulla null reference (Nothing in Visual Basic), the thread current culture is used.

• result
  Type: System.Byte%
  When this method returns, contains the 8-bit unsigned integer value 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 nulla null reference (Nothing in Visual Basic), is not of the correct format, or represents a number less than MinValue or greater than MaxValue. This parameter is passed uninitialized.

Return Value

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

Imports System.Globalization

Module Example
   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim byteString As String
      Dim styles As NumberStyles

      byteString = "1024"
      styles = NumberStyles.Integer
      CallTryParse(outputBlock, byteString, styles)

      byteString = "100.1"
      styles = NumberStyles.Integer Or NumberStyles.AllowDecimalPoint
      CallTryParse(outputBlock, byteString, styles)

      byteString = "100.0"
      CallTryParse(outputBlock, byteString, styles)

      byteString = "+100"
      styles = NumberStyles.Integer Or NumberStyles.AllowLeadingSign _
               Or NumberStyles.AllowTrailingSign
      CallTryParse(outputBlock, byteString, styles)

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

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

      byteString = "00,100"
      styles = NumberStyles.Integer Or NumberStyles.AllowThousands
      CallTryParse(outputBlock, byteString, styles)

      byteString = "2E+3   "
      styles = NumberStyles.Integer Or NumberStyles.AllowExponent
      CallTryParse(outputBlock, byteString, styles)

      byteString = "FF"
      styles = NumberStyles.HexNumber
      CallTryParse(outputBlock, byteString, styles)

      byteString = "0x1F"
      CallTryParse(outputBlock, byteString, styles)
   End Sub

   Private Sub CallTryParse(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal stringToConvert As String, ByVal styles As NumberStyles)
      Dim byteValue As Byte
      Dim result As Boolean = Byte.TryParse(stringToConvert, styles, Nothing, _
                                            byteValue)
      If result Then
         outputBlock.Text += String.Format("Converted '{0}' to {1}", _
                        stringToConvert, byteValue) + vbCrLf
      Else
         If stringToConvert Is Nothing Then stringToConvert = ""
         outputBlock.Text += String.Format("Attempted conversion of '{0}' failed.", _
                           stringToConvert.ToString()) + vbCrLf
      End If
   End Sub
End Module
' The example displays the following output:
'       Attempted conversion of '1024' failed.
'       Attempted conversion of '100.1' failed.
'       Converted '100.0' to 100
'       Converted '+100' to 100
'       Attempted conversion of '-100' failed.
'       Converted '000000000000000100' to 100
'       Converted '00,100' to 100
'       Attempted conversion of '2E+3   ' failed.
'       Converted 'FF' to 255
'       Attempted conversion of '0x1F' failed.

using System;
using System.Globalization;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      string byteString;
      NumberStyles styles;

      byteString = "1024";
      styles = NumberStyles.Integer;
      CallTryParse(outputBlock, byteString, styles);

      byteString = "100.1";
      styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
      CallTryParse(outputBlock, byteString, styles);

      byteString = "100.0";
      CallTryParse(outputBlock, byteString, styles);

      byteString = "+100";
      styles = NumberStyles.Integer | NumberStyles.AllowLeadingSign
               | NumberStyles.AllowTrailingSign;
      CallTryParse(outputBlock, byteString, styles);

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

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

      byteString = "00,100";
      styles = NumberStyles.Integer | NumberStyles.AllowThousands;
      CallTryParse(outputBlock, byteString, styles);

      byteString = "2E+3   ";
      styles = NumberStyles.Integer | NumberStyles.AllowExponent;
      CallTryParse(outputBlock, byteString, styles);

      byteString = "FF";
      styles = NumberStyles.HexNumber;
      CallTryParse(outputBlock, byteString, styles);

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

   private static void CallTryParse(System.Windows.Controls.TextBlock outputBlock, string stringToConvert, NumberStyles styles)
   {
      Byte byteValue;
      bool result = Byte.TryParse(stringToConvert, styles,
                                  null as IFormatProvider, out byteValue);
      if (result)
         outputBlock.Text += String.Format("Converted '{0}' to {1}",
                        stringToConvert, byteValue) + "\n";
      else
         outputBlock.Text += String.Format("Attempted conversion of '{0}' failed.",
                           stringToConvert.ToString()) + "\n";
   }
}
// The example displays the following output:
//       Attempted conversion of '1024' failed.
//       Attempted conversion of '100.1' failed.
//       Converted '100.0' to 100
//       Converted '+100' to 100
//       Attempted conversion of '-100' failed.
//       Converted '000000000000000100' to 100
//       Converted '00,100' to 100
//       Attempted conversion of '2E+3   ' failed.
//       Converted 'FF' to 255
//       Attempted conversion of '0x1F' failed.