FileIOPermission.Intersect メソッド
アセンブリ: mscorlib (mscorlib.dll 内)
構文
Dim instance As FileIOPermission Dim target As IPermission Dim returnValue As IPermission returnValue = instance.Intersect(target)
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。
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。
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
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; }
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; }
// 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
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
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参照
- FileIOPermission.Intersect メソッドのページへのリンク