IsolatedStorageFilePermission.Union メソッドとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

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IsolatedStorageFilePermission.Union メソッド

このメソッドは、.NET Framework インフラストラクチャをサポートします。独自に作成したコードから直接使用するためのものではありません。

現在のアクセス許可と指定したアクセス許可の和集合を表すアクセス許可を作成します。

名前空間: System.Security.Permissions
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Overrides Function
 Union ( _
    target As IPermission _
) As IPermission

Visual Basic (使用法)

Dim instance As IsolatedStorageFilePermission
Dim target As IPermission
Dim returnValue As IPermission

returnValue = instance.Union(target)

public override IPermission Union (
    IPermission target
)

C++

public:
virtual IPermission^ Union (
    IPermission^ target
) override

public IPermission Union (
    IPermission target
)

JScript

public override function Union (
    target : IPermission
) : IPermission

パラメータ

target: 現在のアクセス許可と和集合を持つアクセス許可。これは、現在のアクセス許可と同じ型であることが必要です。

戻り値
現在のアクセス許可と指定したアクセス許可の和集合を表す新しいアクセス許可。

例外

例外の種類	条件
ArgumentException	target パラメータが null 参照 (Visual Basic では Nothing) ではなく、現在のアクセス許可と同じ型でもありません。

解説

Union を呼び出すと、現在のアクセス許可と指定したアクセス許可の両方が表す操作をすべて表すアクセス許可が作成されます。いずれかのアクセス許可を要求し、その要求が満たされた場合、両者の和集合を表すアクセス許可に対する要求も満たされます。

使用例

Union メソッドの使用方法を次のコード例に示します。このコード例は、IsolatedStorageFilePermission クラスのトピックで取り上げているコード例の一部分です。

Visual Basic

Private Sub UnionDemo()
    Console.WriteLine(ControlChars.Lf + "Union demo.")
    Dim isfp0 As New IsolatedStorageFilePermission(PermissionState.Unrestricted)
    Dim isfp1 As New IsolatedStorageFilePermission(PermissionState.Unrestricted)
    Dim isfp2 As New IsolatedStorageFilePermission(PermissionState.None)
    Dim isfp3 As New IsolatedStorageFilePermission(PermissionState.None)

    Dim t As IsolatedStorageFilePermission
 = CType(isfp0.Union(isfp1), IsolatedStorageFilePermission)
    If True = t.IsUnrestricted() Then
        Console.WriteLine("The union of two PermissionState.Unrestricted
 permissions is unrestricted.")
    Else
        Console.WriteLine(("Union demo failed because the union
 of two PermissionState.Unrestricted permissions " + ControlChars.Lf
 + ControlChars.Tab + "should be unrestricted"))
    End If

    t = CType(isfp0.Union(isfp2), IsolatedStorageFilePermission)
    If True = t.IsUnrestricted() Then
        Console.WriteLine(("The union of a PermissionState.Unrestricted
 and a PermissionState.None " + ControlChars.Lf + ControlChars.Tab +
 "permission is unrestricted."))
    Else
        Console.WriteLine(("Union demo failed because the union
 of a PermissionState.Unrestricted and a " + ControlChars.Lf + ControlChars.Tab
 + "PermissionState.None permission should be unrestricted."))
    End If


    t = CType(isfp2.Union(isfp3), IsolatedStorageFilePermission)
    If Nothing Is t Then
        Console.WriteLine("Union failed because the union of two
 PermissionState.None permissions should not be null.")
        Console.WriteLine(t.ToString())
    Else
        Console.WriteLine("The union of two PermissionState.None
 permissions is none.")
    End If
End Sub 'UnionDemo

private void UnionDemo()
{
    Console.WriteLine("\nUnion demo.");
    IsolatedStorageFilePermission isfp0 = new IsolatedStorageFilePermission(PermissionState.Unrestricted);
    IsolatedStorageFilePermission isfp1 = new IsolatedStorageFilePermission(PermissionState.Unrestricted);
    IsolatedStorageFilePermission isfp2 = new IsolatedStorageFilePermission(PermissionState.None);
    IsolatedStorageFilePermission isfp3 = new IsolatedStorageFilePermission(PermissionState.None);

    IsolatedStorageFilePermission t = (IsolatedStorageFilePermission)isfp0.Union(isfp1);
    if (true == t.IsUnrestricted())
    {
        Console.WriteLine("The union of two PermissionState.Unrestricted permissions
 is unrestricted.");
    }
    else
    {
        Console.WriteLine
            ("Union demo failed because the union of two PermissionState.Unrestricted
 permissions " +
            "\n\tshould be unrestricted");
    }

    t = (IsolatedStorageFilePermission)isfp0.Union(isfp2);
    if (true == t.IsUnrestricted())
    {
        Console.WriteLine
            ("The union of a PermissionState.Unrestricted and a PermissionState.None
 " +
            "\n\tpermission is unrestricted.");
    }
    else
    {
        Console.WriteLine
            ("Union demo failed because the union of a PermissionState.Unrestricted
 and a " +
            "\n\tPermissionState.None permission should be unrestricted.");
    }


    t = (IsolatedStorageFilePermission)isfp2.Union(isfp3);
    if (null != t)
    {
        Console.WriteLine("The union of two PermissionState.None permissions
 is none.");
    }
    else
    {
        Console.WriteLine
            ("Union failed because the union of two PermissionState.None permissions
 should not be null.");
        Console.WriteLine(t.ToString());
    }
}

C++

void UnionDemo()
{
   Console::WriteLine( "\nUnion demo." );
   IsolatedStorageFilePermission^ isfp0 = gcnew IsolatedStorageFilePermission( PermissionState::Unrestricted
 );
   IsolatedStorageFilePermission^ isfp1 = gcnew IsolatedStorageFilePermission( PermissionState::Unrestricted
 );
   IsolatedStorageFilePermission^ isfp2 = gcnew IsolatedStorageFilePermission( PermissionState::None
 );
   IsolatedStorageFilePermission^ isfp3 = gcnew IsolatedStorageFilePermission( PermissionState::None
 );
   IsolatedStorageFilePermission^ t = dynamic_cast<IsolatedStorageFilePermission^>(isfp0->Union(
 isfp1 ));
   if ( true == t->IsUnrestricted() )
   {
      Console::WriteLine( "The union of two PermissionState.Unrestricted permissions
 is unrestricted." );
   }
   else
   {
      Console::WriteLine( "Union demo failed because the union of two PermissionState.Unrestricted
 permissions "
      "\n\tshould be unrestricted" );
   }

   t = dynamic_cast<IsolatedStorageFilePermission^>(isfp0->Union( isfp2
 ));
   if ( true == t->IsUnrestricted() )
   {
      Console::WriteLine( "The union of a PermissionState.Unrestricted and a
 PermissionState.None "
      "\n\tpermission is unrestricted." );
   }
   else
   {
      Console::WriteLine( "Union demo failed because the union of a PermissionState.Unrestricted
 and a "
      "\n\tPermissionState.None permission should be unrestricted." );
   }

   t = dynamic_cast<IsolatedStorageFilePermission^>(isfp2->Union( isfp3
 ));
   if ( nullptr != t )
   {
      Console::WriteLine( "The union of two PermissionState.None permissions
 is none." );
   }
   else
   {
      Console::WriteLine( "Union failed because the union of two PermissionState.None
 permissions should not be null." );
      Console::WriteLine( t );
   }
}

private void UnionDemo()
{
    Console.WriteLine("\nUnion demo.");
    IsolatedStorageFilePermission isfp0 = 
        new IsolatedStorageFilePermission(PermissionState.Unrestricted);
    IsolatedStorageFilePermission isfp1 = 
        new IsolatedStorageFilePermission(PermissionState.Unrestricted);
    IsolatedStorageFilePermission isfp2 = 
        new IsolatedStorageFilePermission(PermissionState.None);
    IsolatedStorageFilePermission isfp3 = 
        new IsolatedStorageFilePermission(PermissionState.None);
    IsolatedStorageFilePermission t = 
        ((IsolatedStorageFilePermission)(isfp0.Union(isfp1)));

    if (true == t.IsUnrestricted()) {
        Console.WriteLine("The union of two " 
            + "PermissionState.Unrestricted permissions is unrestricted.");
    }
    else {
        Console.WriteLine(("Union demo failed because the union " 
            + "of two PermissionState.Unrestricted permissions " 
            + "\n\tshould be unrestricted"));
    }
    t = ((IsolatedStorageFilePermission)(isfp0.Union(isfp2)));
    if (true == t.IsUnrestricted()) {
        Console.WriteLine(("The union of a PermissionState.Unrestricted "
 
            + "and a PermissionState.None " 
            + "\n\tpermission is unrestricted."));
    }
    else {
        Console.WriteLine(("Union demo failed because the union of a "
 
            + "PermissionState.Unrestricted and a " 
            + "\n\tPermissionState.None permission should be "
            + "unrestricted."));
    }
    t = ((IsolatedStorageFilePermission)(isfp2.Union(isfp3)));
    if (null != t) {
        Console.WriteLine("The union of two PermissionState.None " 
            + "permissions is none.");
    }
    else {
        Console.WriteLine("Union failed because the union of two " 
            + "PermissionState.None permissions should not be null.");
        Console.WriteLine(t.ToString());
    }
} //UnionDemo

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
IsolatedStorageFilePermission クラス
IsolatedStorageFilePermission メンバ
System.Security.Permissions 名前空間

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IsolatedStorageFilePermission.Union メソッドとは？ わかりやすく解説

IsolatedStorageFilePermission.Union メソッド

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IsolatedStorageFilePermission.Union メソッドとは？わかりやすく解説