FileIOPermission.Union-Methode
Erstellt eine Berechtigung als Gesamtmenge der aktuellen und der angegebenen Berechtigung.
Namespace: System.Security.Permissions
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Overrides Function Union ( _
other As IPermission _
) As IPermission
'Usage
Dim instance As FileIOPermission
Dim other As IPermission
Dim returnValue As IPermission
returnValue = instance.Union(other)
public override IPermission Union (
IPermission other
)
public:
virtual IPermission^ Union (
IPermission^ other
) override
public IPermission Union (
IPermission other
)
public override function Union (
other : IPermission
) : IPermission
Parameter
- other
Eine Berechtigung, die mit der aktuellen Berechtigung kombiniert werden soll. Diese muss von demselben Typ wie die aktuelle Berechtigung sein.
Rückgabewert
Eine neue Berechtigung, die die Gesamtmenge der aktuellen und der angegebenen Berechtigung darstellt.
Ausnahmen
| Ausnahmetyp | Bedingung |
|---|---|
Der other-Parameter ist nicht NULL (Nothing in Visual Basic) und nicht von demselben Typ wie die aktuelle Berechtigung. |
Hinweise
Das Ergebnis eines Aufrufs von Union ist eine Berechtigung, die alle Operationen darstellt, die sowohl durch die aktuelle als auch die angegebene Berechtigung dargestellt werden. Anforderungen, die eine der beiden Berechtigungen erfolgreich durchlaufen, durchlaufen auch deren Gesamtmenge erfolgreich.
Beispiel
Private Function UnionDemo() As Boolean
Dim returnValue As Boolean = True
Dim fileIO1 As String = ""
Dim fileIO2 As String = ""
Dim fileIOPerm1, fileIOPerm2 As FileIOPermission
Dim fileIOPerm3 As IPermission
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)
Try
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)
fileIOPerm3 = CType(fileIOPerm1.Union(fileIOPerm2), FileIOPermission)
fileIOPerm3 = fileIOPerm1.Union(fileIOPerm2)
If fileIOPerm3 Is Nothing Then
Console.WriteLine(("The union of " & firstPermission & " and " & secondPermission & " is null."))
Else
Console.WriteLine(("The union of " & firstPermission & " and " & secondPermission & " = " & ControlChars.Lf & ControlChars.Tab & CType(fileIOPerm3, FileIOPermission).GetPathList(FileIOPermissionAccess.Read)(0)))
End If
Catch e As Exception
Console.WriteLine(("An exception was thrown for union " & e.ToString()))
returnValue = False
End Try
ContinueWhile2:
End While
ContinueWhile1:
End While
Return returnValue
End Function 'UnionDemo
private bool UnionDemo()
{
bool returnValue = true;
string fileIO1, fileIO2;
FileIOPermission fileIOPerm1, fileIOPerm2;
IPermission 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);
if (fileIO1 == null) continue;
Console.WriteLine("**********************************************************\n");
fileIOGen2.ResetIndex();
while (fileIOGen2.CreateFilePath( out fileIO2 ))
{
if (fileIO2 == "")
fileIOPerm2 = new FileIOPermission(PermissionState.None);
else
fileIOPerm2 = new FileIOPermission(FileIOPermissionAccess.Read, fileIO2);
try
{
string firstPermission = fileIO1 == "" | fileIO1 == null ? "null" : fileIO1;
string secondPermission = fileIO2 == "" | fileIO2 == null ? "null" : fileIO2;
fileIOPerm3 = (FileIOPermission)fileIOPerm1.Union(fileIOPerm2);
fileIOPerm3 = fileIOPerm1.Union(fileIOPerm2);
if (fileIOPerm3 == null)
{
Console.WriteLine("The union of " + firstPermission + " and " + secondPermission + " is null.");
}
else
{
Console.WriteLine("The union of " + firstPermission + " and " + secondPermission +
" = \n\t" + ((FileIOPermission)fileIOPerm3).GetPathList(FileIOPermissionAccess.Read)[0]);
}
}
catch (Exception e)
{
Console.WriteLine("An exception was thrown for union " + e);
returnValue = false;
}
}
}
return returnValue;
}
bool UnionDemo()
{
bool returnValue = true;
String^ fileIO1;
String^ fileIO2;
FileIOPermission^ fileIOPerm1;
FileIOPermission^ fileIOPerm2;
IPermission^ 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);
try
{
if ( fileIOPerm2 == nullptr )
continue;
String^ firstPermission = fileIO1 == "" || fileIO1 == nullptr ? "null" : fileIO1;
String^ secondPermission = fileIO2 == "" || fileIO2 == nullptr ? "null" : fileIO2;
fileIOPerm3 = dynamic_cast<FileIOPermission^>(fileIOPerm1->Union( fileIOPerm2 ));
fileIOPerm3 = fileIOPerm1->Union( fileIOPerm2 );
if ( fileIOPerm3 == nullptr )
{
Console::WriteLine( "The union of {0} and {1} is null.", firstPermission, secondPermission );
}
else
{
Console::WriteLine( "The union of {0} and {1} = \n\t{2}", firstPermission, secondPermission, (dynamic_cast<FileIOPermission^>(fileIOPerm3))->GetPathList( FileIOPermissionAccess::Read )[ 0 ] );
}
}
catch ( Exception^ e )
{
Console::WriteLine( "An exception was thrown for union {0}", e );
returnValue = false;
}
}
}
return returnValue;
}
// Union creates a new permission that is the union of the current
// permission and the specified permission.
private boolean UnionDemo()
{
boolean returnValue = true;
String fileIO1[] = new String[1];
String fileIO2[] = new String[1];
FileIOPermission fileIOPerm1[] = new FileIOPermission[1];
FileIOPermission fileIOPerm2[] = new FileIOPermission[1];
IPermission 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)) {
try {
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];
fileIOPerm3 =((FileIOPermission)(fileIOPerm1[0].
Union(fileIOPerm2[0])));
fileIOPerm3 = fileIOPerm1[0].Union(fileIOPerm2[0]);
if (fileIOPerm3 == null) {
Console.WriteLine(("The union of "
+ firstPermission + " and "
+ secondPermission
+ " is null."));
}
else {
Console.WriteLine(("The union of " + firstPermission
+ " and " + secondPermission + " = \n\t"
+ ((FileIOPermission)(fileIOPerm3)).
GetPathList(FileIOPermissionAccess.Read).
get_Item( 0)));
}
}
catch(System.Exception e) {
Console.WriteLine(("An exception was "
+ "thrown for union " + e));
returnValue = false;
}
}
}
return returnValue ;
} //UnionDemo
Plattformen
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
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
Siehe auch
Referenz
FileIOPermission-Klasse
FileIOPermission-Member
System.Security.Permissions-Namespace