数値の特定の String 形式を等価の 8 ビット符号付き整数に変換します。
このメソッドは、CLS と互換性がありません。CLS との互換性に関する詳細については 「共通言語仕様の概要」 を参照してください。
<CLSCompliant(False)>
Overloads Public Shared Function ToSByte( _ ByVal value As String _) As SByte
[C#]
[CLSCompliant(false)]
public static sbyte ToSByte(stringvalue);
[C++]
[CLSCompliant(false)]
public: static char ToSByte(String* value);
[JScript]
public
CLSCompliant(false)
static function ToSByte(value : String) : SByte;
パラメータ
- value
変換する数値を格納している String 。
戻り値
value の値と等価な 8 ビット符号付き整数。
または
value が null 参照 (Visual Basic では Nothing) の場合は 0 です。
例外
| 例外の種類 | 条件 |
|---|---|
| FormatException | value の構成が、省略可能な符号と、それに続く 0 から 9 までの一連の数字ではありません。 |
| OverflowException | value が MinValue 未満の数値か、 MaxValue より大きい数値を表しています。 |
使用例
[Visual Basic, C#, C++] 既定の書式設定を使用し、 String 形式の SByte (符号付きバイト) 値を ToSByte メソッドで変換するコード例を次に示します。
' Example of the Convert.ToSByte( String ) and
' Convert.ToSByte( String, IFormatProvider ) methods.
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic
Module ToSByteProviderDemo
Dim format As String = "{0,-20}{1,-20}{2}"
' Get the exception type name; remove the namespace prefix.
Function GetExceptionType( ex As Exception ) As String
Dim exceptionType As String = ex.GetType( ).ToString( )
Return exceptionType.Substring( _
exceptionType.LastIndexOf( "."c ) + 1 )
End Function
Sub ConvertToSByte( numericStr As String, _
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
Console.WriteLine( format, numericStr, _
defaultValue, providerValue )
End Sub
Sub Main( )
' 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
Console.WriteLine( "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 )
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 )
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
[C#]
// 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.
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 );
}
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
*/
[C++]
// Example of the Convert::ToSByte( String* ) and
// Convert::ToSByte( String*, IFormatProvider* ) methods.
#using <mscorlib.dll>
using namespace System;
using namespace System::Globalization;
const __wchar_t* protoFmt = L"{0,-20}{1,-20}{2}" ;
// Get the exception type name; remove the namespace prefix.
String* GetExceptionType( Exception* ex )
{
String* exceptionType = ex->GetType( )->ToString( );
return exceptionType->Substring(
exceptionType->LastIndexOf( '.' ) + 1 );
}
void ConvertToSByte( String* numericStr, IFormatProvider* provider )
{
Object* defaultValue;
Object* providerValue;
// Convert numericStr to SByte without a format provider.
try
{
defaultValue = __box( Convert::ToSByte( numericStr ) );
}
catch( Exception* ex )
{
defaultValue = GetExceptionType( ex );
}
// Convert numericStr to SByte with a format provider.
try
{
providerValue = __box( Convert::ToSByte(
numericStr, provider ) );
}
catch( Exception* ex )
{
providerValue = GetExceptionType( ex );
}
Console::WriteLine( new String( protoFmt ), numericStr,
defaultValue, providerValue );
}
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 = S"neg ";
provider->PositiveSign = S"pos ";
// These properties do not affect the conversion.
// The input string cannot have decimal and group separators.
provider->NumberDecimalSeparator = S".";
provider->NumberNegativePattern = 0;
Console::WriteLine(S"This example of\n"
S" Convert::ToSByte( String* ) and \n"
S" Convert::ToSByte( String*, IFormatProvider* ) "
S"\ngenerates the following output. It converts "
S"several strings to \nSByte values, using "
S"default formatting or a NumberFormatInfo object.\n" );
Console::WriteLine( new String( protoFmt ), S"String to convert",
S"Default/exception", S"Provider/exception" );
Console::WriteLine( new String( protoFmt ), S"-----------------",
S"-----------------", S"------------------" );
// Convert strings, with and without an IFormatProvider.
ConvertToSByte( S"123", provider );
ConvertToSByte( S"+123", provider );
ConvertToSByte( S"pos 123", provider );
ConvertToSByte( S"-123", provider );
ConvertToSByte( S"neg 123", provider );
ConvertToSByte( S"123.", provider );
ConvertToSByte( S"(123)", provider );
ConvertToSByte( S"128", provider );
ConvertToSByte( S"-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
*/
[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン .gif)
をクリックします。
必要条件
プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET, Common Language Infrastructure (CLI) Standard
参照
Convert クラス | Convert メンバ | System 名前空間 | Convert.ToSByte オーバーロードの一覧 | SByte.Parse