Convert.ToSByte Method (String, IFormatProvider)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Converts the specified String representation of a number to an equivalent 8-bit signed integer using specified culture-specific formatting information.
This API is not CLS-compliant.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
<CLSCompliantAttribute(False)> _
Public Shared Function ToSByte ( _
value As String, _
provider As IFormatProvider _
) As SByte
[CLSCompliantAttribute(false)]
public static sbyte ToSByte(
string value,
IFormatProvider provider
)
Parameters
- value
Type: System..::.String
A String containing a number to convert.
- provider
Type: System..::.IFormatProvider
An IFormatProvider interface implementation that supplies culture-specific formatting information.
Return Value
Type: System..::.SByte
An 8-bit signed integer equivalent to the value of value.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | value is nullNothingnullptra null reference (Nothing in Visual Basic). |
| FormatException | value does not consist of an optional sign followed by a sequence of digits (zero through nine). |
| OverflowException | value represents a number less than MinValue or greater than MaxValue. |
Remarks
provider is an IFormatProvider instance that obtains a NumberFormatInfo object. The NumberFormatInfo object provides culture-specific information about the format of value. If provider is nullNothingnullptra null reference (Nothing in Visual Basic), the NumberFormatInfo for the current culture is used.
If you prefer not to handle an exception if the conversion fails, you can call the SByte..::.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.
Examples
The following code example converts String representations of SByte (signed byte) values with the ToSByte method, using an IFormatProvider object.
' Example of the Convert.ToSByte( String ) and
' Convert.ToSByte( String, IFormatProvider ) methods.
Imports System.Globalization
Module Example
Dim format As String = "{0,-20}{1,-20}{2}"
' Get the exception type name; remove the namespace prefix.
Function GetExceptionType(ByVal ex As Exception) As String
Dim exceptionType As String = ex.GetType().ToString()
Return exceptionType.Substring( _
exceptionType.LastIndexOf("."c) + 1)
End Function
Sub ConvertToSByte(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal numericStr As String, _
ByVal provider As IFormatProvider)
Dim defaultValue As Object
Dim providerValue As Object
' Convert numericStr to SByte without a format provider.
Try
defaultValue = Convert.ToSByte(numericStr)
Catch ex As Exception
defaultValue = GetExceptionType(ex)
End Try
' Convert numericStr to SByte with a format provider.
Try
providerValue = Convert.ToSByte(numericStr, provider)
Catch ex As Exception
providerValue = GetExceptionType(ex)
End Try
outputBlock.Text &= String.Format(format, numericStr, _
defaultValue, providerValue) & vbCrLf
End Sub
Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
' Create a NumberFormatInfo object and set several of its
' properties that apply to numbers.
Dim provider As NumberFormatInfo = New NumberFormatInfo()
' These properties affect the conversion.
provider.NegativeSign = "neg "
provider.PositiveSign = "pos "
' These properties do not affect the conversion.
' The input string cannot have decimal and group separators.
provider.NumberDecimalSeparator = "."
provider.NumberNegativePattern = 0
outputBlock.Text &= String.Format("This example of" & vbCrLf & _
" Convert.ToSByte( String ) and " & vbCrLf & _
" Convert.ToSByte( String, IFormatProvider ) " & _
vbCrLf & "generates the following output. It " & _
"converts several strings to " & vbCrLf & "SByte " & _
"values, using default formatting " & _
"or a NumberFormatInfo object." & vbCrLf) & vbCrLf
outputBlock.Text &= String.Format(format, "String to convert", _
"Default/exception", "Provider/exception") & vbCrLf
outputBlock.Text &= String.Format(format, "-----------------", _
"-----------------", "------------------") & vbCrLf
' Convert strings, with and without an IFormatProvider.
ConvertToSByte(outputBlock, "123", provider)
ConvertToSByte(outputBlock, "+123", provider)
ConvertToSByte(outputBlock, "pos 123", provider)
ConvertToSByte(outputBlock, "-123", provider)
ConvertToSByte(outputBlock, "neg 123", provider)
ConvertToSByte(outputBlock, "123.", provider)
ConvertToSByte(outputBlock, "(123)", provider)
ConvertToSByte(outputBlock, "128", provider)
ConvertToSByte(outputBlock, "-129", provider)
End Sub
End Module
' This example of
' Convert.ToSByte( String ) and
' Convert.ToSByte( String, IFormatProvider )
' generates the following output. It converts several strings to
' SByte values, using default formatting or a NumberFormatInfo object.
'
' String to convert Default/exception Provider/exception
' ----------------- ----------------- ------------------
' 123 123 123
' +123 123 FormatException
' pos 123 FormatException 123
' -123 -123 FormatException
' neg 123 FormatException -123
' 123. FormatException FormatException
' (123) FormatException FormatException
' 128 OverflowException OverflowException
' -129 OverflowException FormatException
// Example of the Convert.ToSByte( string ) and
// Convert.ToSByte( string, IFormatProvider ) methods.
using System;
using System.Globalization;
class Example
{
static string format = "{0,-20}{1,-20}{2}";
// Get the exception type name; remove the namespace prefix.
static string GetExceptionType(Exception ex)
{
string exceptionType = ex.GetType().ToString();
return exceptionType.Substring(
exceptionType.LastIndexOf('.') + 1);
}
static void ConvertToSByte(System.Windows.Controls.TextBlock outputBlock, string numericStr,
IFormatProvider provider)
{
object defaultValue;
object providerValue;
// Convert numericStr to SByte without a format provider.
try
{
defaultValue = Convert.ToSByte(numericStr);
}
catch (Exception ex)
{
defaultValue = GetExceptionType(ex);
}
// Convert numericStr to SByte with a format provider.
try
{
providerValue = Convert.ToSByte(numericStr, provider);
}
catch (Exception ex)
{
providerValue = GetExceptionType(ex);
}
outputBlock.Text += String.Format(format, numericStr,
defaultValue, providerValue) + "\n";
}
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
// Create a NumberFormatInfo object and set several of its
// properties that apply to numbers.
NumberFormatInfo provider = new NumberFormatInfo();
// These properties affect the conversion.
provider.NegativeSign = "neg ";
provider.PositiveSign = "pos ";
// These properties do not affect the conversion.
// The input string cannot have decimal and group separators.
provider.NumberDecimalSeparator = ".";
provider.NumberNegativePattern = 0;
outputBlock.Text += String.Format("This example of\n" +
" Convert.ToSByte( string ) and \n" +
" Convert.ToSByte( string, IFormatProvider ) " +
"\ngenerates the following output. It converts " +
"several strings to \nSByte values, using " +
"default formatting or a NumberFormatInfo object.\n") + "\n";
outputBlock.Text += String.Format(format, "String to convert",
"Default/exception", "Provider/exception") + "\n";
outputBlock.Text += String.Format(format, "-----------------",
"-----------------", "------------------") + "\n";
// Convert strings, with and without an IFormatProvider.
ConvertToSByte(outputBlock, "123", provider);
ConvertToSByte(outputBlock, "+123", provider);
ConvertToSByte(outputBlock, "pos 123", provider);
ConvertToSByte(outputBlock, "-123", provider);
ConvertToSByte(outputBlock, "neg 123", provider);
ConvertToSByte(outputBlock, "123.", provider);
ConvertToSByte(outputBlock, "(123)", provider);
ConvertToSByte(outputBlock, "128", provider);
ConvertToSByte(outputBlock, "-129", provider);
}
}
/*
This example of
Convert.ToSByte( string ) and
Convert.ToSByte( string, IFormatProvider )
generates the following output. It converts several strings to
SByte values, using default formatting or a NumberFormatInfo object.
String to convert Default/exception Provider/exception
----------------- ----------------- ------------------
123 123 123
+123 123 FormatException
pos 123 FormatException 123
-123 -123 FormatException
neg 123 FormatException -123
123. FormatException FormatException
(123) FormatException FormatException
128 OverflowException OverflowException
-129 OverflowException FormatException
*/
Version Information
Windows Phone OS
Supported in: 8.1, 8.0, 7.1, 7.0
Platforms
Windows Phone