FlagsAttribute コンストラクタ

FlagsAttribute クラスの新しいインスタンスを初期化します。

Public Sub New()
[C#]
public FlagsAttribute();
[C++]
public: FlagsAttribute();
[JScript]
public function FlagsAttribute();

使用例

[Visual Basic, C#, C++] FlagsAttribute 属性を Enum 宣言で使用した場合の ToString メソッドへの影響を示すコード例を次に示します。

 
' Example of the FlagsAttribute attribute.
Imports System
Imports Microsoft.VisualBasic

Module FlagsAttributeDemo
    
    ' Define an Enum without FlagsAttribute.
    Enum SingleHue as Short
        Black = 0
        Red = 1
        Green = 2
        Blue = 4
    End Enum

    ' Define an Enum with FlagsAttribute.
    <FlagsAttribute( )> _
    Enum MultiHue as Short
        Black = 0
        Red = 1
        Green = 2
        Blue = 4
    End Enum

    Sub Main( )
        Console.WriteLine( _
            "This example of the FlagsAttribute attribute " & _
            vbCrLf & "generates the following output." )
        Console.WriteLine( vbCrLf & _
            "All possible combinations of values of an " & _
            vbCrLf & "Enum without FlagsAttribute:" & vbCrLf )
        
        ' Display all possible combinations of values.
        Dim val as Integer
        For val = 0 to 8
            Console.WriteLine( "{0,3} - {1}", _
                val, CType( val, SingleHue ).ToString( ) )
        Next val

        Console.WriteLine( vbCrLf & _
            "All possible combinations of values of an " & _
            vbCrLf & "Enum with FlagsAttribute:" & vbCrLf )
        
        ' Display all possible combinations of values.
        ' Also display an invalid value.
        For val = 0 to 8
            Console.WriteLine( "{0,3} - {1}", _
                val, CType( val, MultiHue ).ToString( ) )
        Next val
    End Sub 
End Module 

' This example of the FlagsAttribute attribute
' generates the following output.
' 
' All possible combinations of values of an
' Enum without FlagsAttribute:
' 
'   0 - Black
'   1 - Red
'   2 - Green
'   3 - 3
'   4 - Blue
'   5 - 5
'   6 - 6
'   7 - 7
'   8 - 8
' 
' All possible combinations of values of an
' Enum with FlagsAttribute:
' 
'   0 - Black
'   1 - Red
'   2 - Green
'   3 - Red, Green
'   4 - Blue
'   5 - Red, Blue
'   6 - Green, Blue
'   7 - Red, Green, Blue
'   8 - 8

[C#] 
// Example of the FlagsAttribute attribute.
using System;

class FlagsAttributeDemo
{
    // Define an Enum without FlagsAttribute.
    enum SingleHue : short
    {
        Black = 0,
        Red = 1,
        Green = 2,
        Blue = 4
    };

    // Define an Enum with FlagsAttribute.
    [FlagsAttribute] 
    enum MultiHue : short
    {
        Black = 0,
        Red = 1,
        Green = 2,
        Blue = 4
    };

    static void Main( )
    {
        Console.WriteLine( 
            "This example of the FlagsAttribute attribute \n" +
            "generates the following output." );
        Console.WriteLine( 
            "\nAll possible combinations of values of an \n" +
            "Enum without FlagsAttribute:\n" );
        
        // Display all possible combinations of values.
        for( int val = 0; val <= 8; val++ )
            Console.WriteLine( "{0,3} - {1}", 
                val, ( (SingleHue)val ).ToString( ) );

        Console.WriteLine( 
            "\nAll possible combinations of values of an \n" +
            "Enum with FlagsAttribute:\n" );
        
        // Display all possible combinations of values.
        // Also display an invalid value.
        for( int val = 0; val <= 8; val++ )
            Console.WriteLine( "{0,3} - {1}", 
                val, ( (MultiHue)val ).ToString( ) );
    } 
} 

/*
This example of the FlagsAttribute attribute
generates the following output.

All possible combinations of values of an
Enum without FlagsAttribute:

  0 - Black
  1 - Red
  2 - Green
  3 - 3
  4 - Blue
  5 - 5
  6 - 6
  7 - 7
  8 - 8

All possible combinations of values of an
Enum with FlagsAttribute:

  0 - Black
  1 - Red
  2 - Green
  3 - Red, Green
  4 - Blue
  5 - Red, Blue
  6 - Green, Blue
  7 - Red, Green, Blue
  8 - 8
*/

[C++] 
// Example of the FlagsAttribute attribute.
#using <mscorlib.dll>
using namespace System;

// Define an Enum without FlagsAttribute.
__value enum SingleHue : short
{
    Black = 0,
    Red = 1,
    Green = 2,
    Blue = 4
};

// Define an Enum with FlagsAttribute.
[FlagsAttribute] 
__value enum MultiHue : short
{
    Black = 0,
    Red = 1,
    Green = 2,
    Blue = 4
};

void main( )
{
    Console::WriteLine( 
        S"This example of the FlagsAttribute attribute \n" 
        S"generates the following output." );
    Console::WriteLine( 
        S"\nAll possible combinations of values of an \n" 
        S"Enum without FlagsAttribute:\n" );
    
    // Display all possible combinations of values.
    for( int val = 0; val <= 8; val++ )
        Console::WriteLine( S"{0,3} - {1}", 
            __box( val ), __box( (SingleHue)val )->ToString( ) );

    Console::WriteLine( 
        S"\nAll possible combinations of values of an \n" 
        S"Enum with FlagsAttribute:\n" );
    
    // Display all possible combinations of values.
    // Also display an invalid value.
    for( int val = 0; val <= 8; val++ )
        Console::WriteLine( S"{0,3} - {1}", 
            __box( val ), __box( (MultiHue)val )->ToString( ) );
}

/*
This example of the FlagsAttribute attribute
generates the following output.

All possible combinations of values of an
Enum without FlagsAttribute:

  0 - Black
  1 - Red
  2 - Green
  3 - 3
  4 - Blue
  5 - 5
  6 - 6
  7 - 7
  8 - 8

All possible combinations of values of an
Enum with FlagsAttribute:

  0 - Black
  1 - Red
  2 - Green
  3 - Red, Green
  4 - Blue
  5 - Red, Blue
  6 - Green, Blue
  7 - Red, Green, Blue
  8 - 8
*/

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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

FlagsAttribute クラス | FlagsAttribute メンバ | System 名前空間