FileIOPermission.Intersect メソッド

.NET Framework クラス ライブラリ リファレンス

FileIOPermission.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 FileIOPermission
Dim target As IPermission
Dim returnValue As IPermission

returnValue = instance.Intersect(target)

C#

public override IPermission Intersect (
    IPermission target
)

C++

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

J#

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。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

Visual Basic

    Private Function IntersectDemo() As
 Boolean

        Dim returnValue As Boolean
 = True

        Dim fileIO1 As String
 = ""
        Dim fileIO2 As String
 = ""
        Dim fileIOPerm1, fileIOPerm2, fileIOPerm3 As
 FileIOPermission

        Dim fileIOGen1 As New
 FileIOGenerator()
        Dim fileIOGen2 As New
 FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1)
            End If
            Console.WriteLine("**********************************************************"
 & ControlChars.Lf)
            fileIOGen2.ResetIndex()

            While fileIOGen2.CreateFilePath(fileIO2)
                If fileIO2 = ""
 Then
                    fileIOPerm2 = New FileIOPermission(PermissionState.None)
                Else
                    fileIOPerm2 = New FileIOPermission(FileIOPermissionAccess.Read,
 fileIO2)
                End If
                Dim firstPermission As String
 = IIf(fileIO1 = "" Or fileIO1
 Is Nothing, "null", fileIO1)
                Dim secondPermission As String
 = IIf(fileIO2 = "" Or fileIO2
 Is Nothing, "null", fileIO2)
                Try

                    fileIOPerm3 = CType(fileIOPerm1.Intersect(fileIOPerm2), FileIOPermission)
                    If Not (fileIOPerm3 Is
 Nothing) AndAlso Not (fileIOPerm3.GetPathList(FileIOPermissionAccess.Read)
 Is Nothing) Then

                        Console.WriteLine(("The intersection of
 " & firstPermission & "  and "
 & ControlChars.Lf & ControlChars.Tab & secondPermission & " = " & ControlChars.Lf & ControlChars.Tab &
 CType(fileIOPerm3, FileIOPermission).GetPathList(FileIOPermissionAccess.Read)(0)))
                    Else
                        Console.WriteLine(("The intersection of
 " & firstPermission & "  and "
 & secondPermission & " is null."))
                    End If
                Catch e As Exception
                    Console.WriteLine(("An exception was thrown
 for intersection " & e.ToString()))
                    returnValue = False
                End Try
ContinueWhile2:
            End While
ContinueWhile1:
        End While

        Return returnValue
    End Function 'IntersectDemo

C#

private bool IntersectDemo()
{

    bool returnValue = true;

    string fileIO1, fileIO2;
    FileIOPermission fileIOPerm1, fileIOPerm2, fileIOPerm3;

    FileIOGenerator fileIOGen1 = new FileIOGenerator();
    FileIOGenerator fileIOGen2 = new FileIOGenerator();

    fileIOGen1.ResetIndex();
    while (fileIOGen1.CreateFilePath(out fileIO1 ))
    {
        if (fileIO1 == "")
            fileIOPerm1 = new FileIOPermission(PermissionState.None);
        else
            fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1);

        Console.WriteLine("**********************************************************\n");
        fileIOGen2.ResetIndex();

        while (fileIOGen2.CreateFilePath( out fileIO2 ))
        {
            if (fileIO2 == "")
                fileIOPerm2 = new FileIOPermission(PermissionState.None);
            else
                fileIOPerm2 = new FileIOPermission(FileIOPermissionAccess.Read,
 fileIO2);
            string firstPermission = fileIO1 == "" |
 fileIO1 == null ? "null" : fileIO1;
            string secondPermission = fileIO2 == ""
 | fileIO2 == null ? "null" : fileIO2;
            try
            {

                fileIOPerm3 = (FileIOPermission)fileIOPerm1.Intersect(fileIOPerm2);
                if (fileIOPerm3 != null &&
 fileIOPerm3.GetPathList(FileIOPermissionAccess.Read) != null)
                {

                    Console.WriteLine("The intersection of " + firstPermission
 + " and \n\t" + secondPermission +
                        " = \n\t" + ((FileIOPermission)fileIOPerm3).GetPathList(FileIOPermissionAccess.Read)[0]);
                }
                else
                {
                    Console.WriteLine("The intersection of " + firstPermission
 + " and " + secondPermission + " is null.");
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("An exception was thrown for
 intersection " + e);
                returnValue = false;
            }
        }
    }

    return returnValue;

}

C++

bool IntersectDemo()
{
   bool returnValue = true;
   String^ fileIO1;
   String^ fileIO2;
   FileIOPermission^ fileIOPerm1;
   FileIOPermission^ fileIOPerm2;
   FileIOPermission^ fileIOPerm3;
   FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
   FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
   fileIOGen1->ResetIndex();
   while ( fileIOGen1->CreateFilePath ( &fileIO1  ) )
   {
      if (fileIO1 == "")
          fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
       else
           fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::Read, fileIO1);

      Console::WriteLine( "**********************************************************\n"
 );
      fileIOGen2->ResetIndex();
      while ( fileIOGen2->CreateFilePath( &fileIO2  ) )
      {
         if (fileIO2 == "")
             fileIOPerm2 = gcnew FileIOPermission(PermissionState::None);
         else
           fileIOPerm2 = gcnew FileIOPermission(FileIOPermissionAccess::Read, fileIO2);
         String^ firstPermission = fileIO1 == "" || fileIO1 == nullptr
 ? "null" : fileIO1;
         String^ secondPermission = fileIO2 == "" || fileIO2 == nullptr
 ? "null" : fileIO2;
         try
         {
            fileIOPerm3 = dynamic_cast<FileIOPermission^>(fileIOPerm1->Intersect(
 fileIOPerm2 ));
            if ( fileIOPerm3 != nullptr && fileIOPerm3->GetPathList(
 FileIOPermissionAccess::Read ) != nullptr )
            {
               Console::WriteLine( "The intersection of {0}  and \n\t{1} = \n\t{2}",
 firstPermission, secondPermission, (dynamic_cast<FileIOPermission^>(fileIOPerm3))->GetPathList(
 FileIOPermissionAccess::Read )[ 0 ] );
            }
            else
            {
               Console::WriteLine( "The intersection of {0}  and {1} is null.",
 firstPermission, secondPermission );
            }
         }
         catch ( Exception^ e ) 
         {
            Console::WriteLine( "An exception was thrown for
 intersection {0}", e );
            returnValue = false;
         }

      }
   }

   return returnValue;
}

J#

// Intersect creates and returns a new permission that is 
// the intersection of the current
// permission and the permission specified.
private boolean IntersectDemo() 
{
    boolean returnValue = true;
    String fileIO1[] = new String[1];
    String fileIO2[] = new String[1];
    FileIOPermission fileIOPerm1[] = new FileIOPermission[1];
    FileIOPermission fileIOPerm2[] = new FileIOPermission[1];
    FileIOPermission fileIOPerm3;
    
    FileIOGenerator fileIOGen1 =  new FileIOGenerator();
    FileIOGenerator fileIOGen2 =  new FileIOGenerator();
    
    fileIOGen1.ResetIndex();
    while(fileIOGen1.CreateFilePath(fileIOPerm1, fileIO1, 
        FileIOPermissionAccess.Read)) {
        if (fileIO1[0] == null) {
            continue ;
        }
        Console.WriteLine("***************************" 
            + "*******************************\n");
        fileIOGen2.ResetIndex();
        
        while(fileIOGen2.CreateFilePath(fileIOPerm2, fileIO2,
 
            FileIOPermissionAccess.Read)) {
            if ( fileIOPerm2[0] == null  )
 {
                continue ;
            }
            String firstPermission = (fileIO1[0].equals("") == 
                true | fileIO1[0] == null)
 ? "null" : fileIO1[0];
            String secondPermission = (fileIO2[0].equals("") == 
                true | fileIO2[0] == null)
 ? "null" : fileIO2[0];
            try {
                fileIOPerm3 =((FileIOPermission)(fileIOPerm1[0].
                Intersect(fileIOPerm2[0])));
                if (fileIOPerm3  != null &&
 
                    fileIOPerm3.GetPathList(FileIOPermissionAccess.Read)
                    != null) {
                    Console.WriteLine(("The intersection of " 
                        + firstPermission + " and \n\t" 
                        + secondPermission + " = \n\t" 
                        + ((FileIOPermission)(fileIOPerm3)).
                        GetPathList(FileIOPermissionAccess.Read).
                        get_Item( 0)));
                }
                else {
                    Console.WriteLine(("The intersection of " 
                        + firstPermission + " and " 
                        + secondPermission + " is null."));
                }
            }
            catch(System.Exception e) {
                Console.WriteLine(("An exception was " 
                    + "thrown for intersection " + e));
                    returnValue = false;
            }
        }
    }
    return returnValue ;
} //IntersectDemo    

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

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
FileIOPermission クラス
FileIOPermission メンバ
System.Security.Permissions 名前空間