IsolatedStorageFilePermission.Intersect 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

索引トップ用語の索引ランキング

IsolatedStorageFilePermission.Intersect メソッド

現在のアクセス許可と指定したアクセス許可の積集合を表すアクセス許可を作成して返します。

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
 Intersect ( _
    target As IPermission _
) As IPermission

Visual Basic (使用法)

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

returnValue = instance.Intersect(target)

public override IPermission Intersect (
    IPermission target
)

C++

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

public IPermission Intersect (
    IPermission target
)

JScript

public override function Intersect (
    target : IPermission
) : IPermission

パラメータ

target: 現在のアクセス許可との積集合を持つアクセス許可オブジェクト。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積集合を表す新しいアクセス許可。積集合が空の場合、この新しいアクセス許可オブジェクトは null 参照 (Visual Basic では Nothing) です。

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

2 つのアクセス許可の積集合となるアクセス許可には、両方に共通する操作の集合が記述されています。2 つのアクセス許可を要求し、その両方について要求が満たされる場合にだけ、それらの積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

Intersect 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 IntersectDemo()
    Console.WriteLine(ControlChars.Lf + "Intersect 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.Intersect(isfp1), IsolatedStorageFilePermission)
    If True = t.IsUnrestricted() Then
        Console.WriteLine("The intersection of two PermissionState.Unrestricted
 permissions is unrestricted.")
    Else
        Console.WriteLine(("Intersect demo failed because the
 intersection of two unrestricted permissions " + ControlChars.Lf +
 ControlChars.Tab + "should be unrestricted."))
    End If

    t = CType(isfp0.Intersect(isfp2), IsolatedStorageFilePermission)
    If False = t.IsUnrestricted() Then
        Console.WriteLine(("The intersection of a PermissionState.Unrestricted
 and " + ControlChars.Lf + ControlChars.Tab + "PermissionState.None
 permission is not unrestricted."))
    Else
        Console.WriteLine(("Intersect demo failed because the
 intersection of a unrestricted and " + ControlChars.Lf + ControlChars.Tab
 + "none permission should be none."))
    End If


    ' The permission set that comes back from this intersection is null.
    t = CType(isfp2.Intersect(isfp3), IsolatedStorageFilePermission)
    If Nothing Is t Then
        Console.WriteLine("The intersection of two PermissionState.None
 permissions is null.")
    Else
        Console.WriteLine(("Intersect failed because the intersection
 of two PermissionState.None permissions " + ControlChars.Lf + ControlChars.Tab
 + "should be null."))
    End If
End Sub 'IntersectDemo

private void IntersectDemo()
{
    Console.WriteLine("\nIntersect 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.Intersect(isfp1);
    if (true == t.IsUnrestricted())
    {
        Console.WriteLine
            ("The intersection of two PermissionState.Unrestricted permissions
 is unrestricted.");
    }
    else
    {
        Console.WriteLine
            ("Intersect demo failed because the intersection of two unrestricted
 permissions " +
            "\n\tshould be unrestricted.");
    }

    t = (IsolatedStorageFilePermission)isfp0.Intersect(isfp2);
    if (false == t.IsUnrestricted())
    {
        Console.WriteLine
            ("The intersection of a PermissionState.Unrestricted and "
 +
            "\n\tPermissionState.None permission is not unrestricted.");
    }
    else
    {
        Console.WriteLine
            ("Intersect demo failed because the intersection of a unrestricted
 and " +
            "\n\tnone permission should be none.");
    }


    // The permission set that comes back from this intersection is
 null.
    t = (IsolatedStorageFilePermission)isfp2.Intersect(isfp3);
    if (null == t)
    {
        Console.WriteLine
            ("The intersection of two PermissionState.None permissions is null.");
    }
    else
    {
        Console.WriteLine
            ("Intersect failed because the intersection of two PermissionState.None
 permissions " +
            "\n\tshould be null.");
    }

}

C++

void IntersectDemo()
{
   Console::WriteLine( "\nIntersect 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->Intersect(
 isfp1 ));
   if ( true == t->IsUnrestricted() )
   {
      Console::WriteLine( "The intersection of two PermissionState.Unrestricted
 permissions is unrestricted." );
   }
   else
   {
      Console::WriteLine( "Intersect demo failed because the intersection of
 two unrestricted permissions "
      "\n\tshould be unrestricted." );
   }

   t = dynamic_cast<IsolatedStorageFilePermission^>(isfp0->Intersect( isfp2
 ));
   if ( false == t->IsUnrestricted() )
   {
      Console::WriteLine( "The intersection of a PermissionState.Unrestricted
 and "
      "\n\tPermissionState.None permission is not unrestricted." );
   }
   else
   {
      Console::WriteLine( "Intersect demo failed because the intersection of
 a unrestricted and "
      "\n\tnone permission should be none." );
   }

   
   // The permission set that comes back from this intersection is null.
   t = dynamic_cast<IsolatedStorageFilePermission^>(isfp2->Intersect( isfp3
 ));
   if ( nullptr == t )
   {
      Console::WriteLine( "The intersection of two PermissionState.None permissions
 is null." );
   }
   else
   {
      Console::WriteLine( "Intersect failed because the intersection of two
 PermissionState.None permissions "
      "\n\tshould be null." );
   }
}

private void IntersectDemo()
{
    Console.WriteLine("\nIntersect 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.Intersect(isfp1)));
    if (true == t.IsUnrestricted()) {
        Console.WriteLine("The intersection of two " 
            + "PermissionState.Unrestricted permissions is unrestricted.");
    }
    else {
        Console.WriteLine(("Intersect demo failed because the " 
            + "intersection of two unrestricted permissions " 
            + "\n\tshould be unrestricted."));
    }
    t = ((IsolatedStorageFilePermission)(isfp0.Intersect(isfp2)));
    if (false == t.IsUnrestricted()) {
        Console.WriteLine(("The intersection of a " 
            + "PermissionState.Unrestricted and " 
            + "\n\tPermissionState.None permission is not unrestricted."));
    }
    else {
        Console.WriteLine(("Intersect demo failed because the " 
            + "intersection of a unrestricted and " 
            + "\n\tnone permission should be none."));
    }

    // The permission set that comes back from this intersection is
 null.
    t = ((IsolatedStorageFilePermission)(isfp2.Intersect(isfp3)));
    if (null == t) {
        Console.WriteLine("The intersection of two " 
            + "PermissionState.None permissions is null.");
    }
    else {
        Console.WriteLine(("Intersect failed because the " 
            + "intersection of two PermissionState.None permissions " 
            + "\n\tshould be null."));
    }
} //IntersectDemo

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.Intersect メソッドとは？ わかりやすく解説

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