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Convert.ToSByte Method (String, IFormatProvider)


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Converts the specified string representation of a number to an equivalent 8-bit signed integer, using the specified culture-specific formatting information.

This API is not CLS-compliant.

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

public static sbyte ToSByte(
	string value,
	IFormatProvider provider


Type: System.String

A string that contains the number to convert.

Type: System.IFormatProvider

An object that supplies culture-specific formatting information.

Return Value

Type: System.SByte

An 8-bit signed integer that is equivalent to value.

Exception Condition

value is null.


value does not consist of an optional sign followed by a sequence of digits (0 through 9).


value represents a number that is less than SByte.MinValue or greater than SByte.MaxValue.

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 null, 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.

The following example converts string representations of SByte values with the ToSByte method, using an IFormatProvider object.

// Example of the Convert.ToSByte( string ) and 
// Convert.ToSByte( string, IFormatProvider ) methods.
using System;
using System.Globalization;

class ToSByteProviderDemo
    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( string numericStr, 
        IFormatProvider provider )
        object defaultValue;
        object providerValue;

        // Convert numericStr to SByte without a format provider.
            defaultValue = Convert.ToSByte( numericStr );
        catch( Exception ex )
            defaultValue = GetExceptionType( ex );

        // Convert numericStr to SByte with a format provider.
            providerValue = Convert.ToSByte( numericStr, provider );
        catch( Exception ex )
            providerValue = GetExceptionType( ex );

        Console.WriteLine( format, numericStr, 
            defaultValue, providerValue );

    public static void Main( )
        // 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;

        Console.WriteLine("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" );
        Console.WriteLine( format, "String to convert", 
            "Default/exception", "Provider/exception" );
        Console.WriteLine( format, "-----------------", 
            "-----------------", "------------------" );

        // Convert strings, with and without an IFormatProvider.
        ConvertToSByte( "123", provider );
        ConvertToSByte( "+123", provider );
        ConvertToSByte( "pos 123", provider );
        ConvertToSByte( "-123", provider );
        ConvertToSByte( "neg 123", provider );
        ConvertToSByte( "123.", provider );
        ConvertToSByte( "(123)", provider );
        ConvertToSByte( "128", provider );
        ConvertToSByte( "-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

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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