DnsPermission.Union-Methode

Erstellt eine Berechtigungsinstanz, die die Gesamtmenge der aktuellen Berechtigungsinstanz und der angegebenen Berechtigungsinstanz ist.

Namespace: System.Net
Assembly: System (in system.dll)

Syntax

'Declaration
Public Overrides Function Union ( _
    target As IPermission _
) As IPermission
'Usage
Dim instance As DnsPermission
Dim target As IPermission
Dim returnValue As IPermission

returnValue = instance.Union(target)

public override IPermission Union (
    IPermission target
)

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

public IPermission Union (
    IPermission target
)

public override function Union (
    target : IPermission
) : IPermission

Parameter

• target
  Die DnsPermission-Instanz, die mit der aktuellen Instanz kombiniert werden soll.

Rückgabewert

Eine DnsPermission-Instanz, die die Gesamtmenge der aktuellen DnsPermission-Instanz mit der angegebenen DnsPermission-Instanz darstellt. Wenn target NULL (Nothing in Visual Basic) ist, gibt diese Methode eine Kopie der aktuellen Instanz zurück. Wenn die aktuelle Instanz oder target uneingeschränkt sind, gibt diese Methode eine uneingeschränkte DnsPermission-Instanz zurück, andernfalls wird eine eingeschränkte DnsPermission-Instanz zurückgegeben.

Ausnahmen

Ausnahmetyp	Bedingung
ArgumentException	target ist weder eine DnsPermission noch NULL (Nothing in Visual Basic).

Hinweise

Die Union-Methode gibt eine DnsPermission-Instanz zurück, die den Zugriff ermöglicht, der entweder durch die aktuelle DnsPermission-Instanz oder die angegebene DnsPermission-Instanz definiert ist. Anforderungen, die eine der beiden Berechtigungen erfolgreich durchlaufen, durchlaufen auch deren Gesamtmenge erfolgreich.

Beispiel

Im folgenden Beispiel wird eine Berechtigungsinstanz erstellt, die die Gesamtmenge aus der aktuellen Berechtigungsinstanz und der angegebenen Berechtigungsinstanz ist.

Private Sub MyUnion()
    ' Create a DnsPermission instance which is the union of the current DnsPermission instance and the specified DnsPermission instance.
    Dim permission As DnsPermission = CType(dnsPermission1.Union(dnsPermission2), DnsPermission)
    ' Print the attributes and values of the union instance of DnsPermission.
    PrintKeysAndValues(permission.ToXml().Attributes)
End Sub 'MyUnion
Public Sub useDns()
    ' Create a DnsPermission instance.
    dnsPermission1 = New DnsPermission(PermissionState.Unrestricted)
    dnsPermission2 = New DnsPermission(PermissionState.None)
    ' Check for permission.
    dnsPermission1.Demand()
    dnsPermission2.Demand()
    Console.WriteLine("Attributes and Values of first DnsPermission instance :")
    PrintKeysAndValues(dnsPermission1.ToXml().Attributes)
    Console.WriteLine("Attributes and Values of second DnsPermission instance :")
    PrintKeysAndValues(dnsPermission2.ToXml().Attributes)
    Console.WriteLine("Union of both instances : ")
    MyUnion()
    Console.WriteLine("Intersection of both instances : ")
    MyIntersection()
End Sub 'useDns

Private Sub PrintKeysAndValues(myList As Hashtable)
    ' Get the enumerator that can iterate through the hash table.
    Dim myEnumerator As IDictionaryEnumerator = myList.GetEnumerator()
    Console.WriteLine(ControlChars.Tab + "-KEY-" + ControlChars.Tab + "-VALUE-")
    While myEnumerator.MoveNext()
        Console.WriteLine(ControlChars.Tab + "{0}:" + ControlChars.Tab + "{1}", myEnumerator.Key, myEnumerator.Value)
    End While
    Console.WriteLine()
End Sub 'PrintKeysAndValues

private void MyUnion()
{
   // Create a DnsPermission instance that is the union of the current DnsPermission
   // instance and the specified DnsPermission instance.     
   DnsPermission permission = (DnsPermission)dnsPermission1.Union(dnsPermission2);
   // Print the attributes and the values of the union instance of DnsPermission.
   PrintKeysAndValues(permission.ToXml().Attributes);
}
public void useDns() {
   // Create a DnsPermission instance.
   dnsPermission1 = new DnsPermission(PermissionState.Unrestricted);
   dnsPermission2 = new DnsPermission(PermissionState.None);
   // Check for permission.
   dnsPermission1.Demand();
   dnsPermission2.Demand();
   Console.WriteLine("Attributes and Values of first DnsPermission instance :");
   PrintKeysAndValues(dnsPermission1.ToXml().Attributes);
   Console.WriteLine("Attributes and Values of second DnsPermission instance :");
   PrintKeysAndValues(dnsPermission2.ToXml().Attributes);
   Console.WriteLine("Union of both instances : ");
   MyUnion();
   Console.WriteLine("Intersection of both instances : ");
   MyIntersection();
}

private void PrintKeysAndValues(Hashtable myList) {
   // Get the enumerator that can iterate through the hash tabble.
   IDictionaryEnumerator myEnumerator = myList.GetEnumerator();
   Console.WriteLine("\t-KEY-\t-VALUE-");
   while (myEnumerator.MoveNext())
      Console.WriteLine("\t{0}:\t{1}", myEnumerator.Key, myEnumerator.Value);
   Console.WriteLine();
}

private:
   void MyUnion()
   {
      // Create a DnsPermission instance that is the union of the current DnsPermission
      // instance and the specified DnsPermission instance.
      DnsPermission^ permission = dynamic_cast<DnsPermission^>(dnsPermission1->Union( dnsPermission2 ));
      // Print the attributes and the values of the union instance of DnsPermission.
      PrintKeysAndValues( permission->ToXml()->Attributes );
   }

public:
   void useDns()
   {
      // Create a DnsPermission instance.
      dnsPermission1 = gcnew DnsPermission( PermissionState::Unrestricted );
      dnsPermission2 = gcnew DnsPermission( PermissionState::None );
      // Check for permission.
      dnsPermission1->Demand();
      dnsPermission2->Demand();
      Console::WriteLine( "Attributes and Values of first DnsPermission instance :" );
      PrintKeysAndValues( dnsPermission1->ToXml()->Attributes );
      Console::WriteLine( "Attributes and Values of second DnsPermission instance :" );
      PrintKeysAndValues( dnsPermission2->ToXml()->Attributes );
      Console::WriteLine( "Union of both instances : " );
      MyUnion();
      Console::WriteLine( "Intersection of both instances : " );
      MyIntersection();
   }

private:
   void PrintKeysAndValues( Hashtable^ myList )
   {
      // Get the enumerator that can iterate through the hash tabble.
      IDictionaryEnumerator^ myEnumerator = myList->GetEnumerator();
      Console::WriteLine( "\t-KEY-\t-VALUE-" );
      while ( myEnumerator->MoveNext() )
      {
         Console::WriteLine( "\t {0}:\t {1}", myEnumerator->Key, myEnumerator->Value );
      }
      Console::WriteLine();
   }

private void MyUnion()
{
    // Create a DnsPermission instance that is the union of the 
    // current DnsPermission
    // instance and the specified DnsPermission instance.     
    DnsPermission permission = (DnsPermission)dnsPermission1.
        Union(dnsPermission2);

    // Print the attributes and the values of the union 
    // instance of DnsPermission.
    PrintKeysAndValues(permission.ToXml().get_Attributes());
} //MyUnion

public void UseDns()
{
    // Create a DnsPermission instance.
    dnsPermission1 = new DnsPermission(PermissionState.Unrestricted);
    dnsPermission2 = new DnsPermission(PermissionState.None);

    // Check for permission.
    dnsPermission1.Demand();
    dnsPermission2.Demand();
    Console.WriteLine("Attributes and Values of first DnsPermission "
        + "instance :");
    PrintKeysAndValues(dnsPermission1.ToXml().get_Attributes());
    Console.WriteLine("Attributes and Values of second DnsPermission "
        + "instance :");
    PrintKeysAndValues(dnsPermission2.ToXml().get_Attributes());
    Console.WriteLine("Union of both instances : ");
    MyUnion();
    Console.WriteLine("Intersection of both instances : ");
    MyIntersection();
} //UseDns

private void PrintKeysAndValues(Hashtable myList)
{
    // Get the enumerator that can iterate through the hash tabble.
    IDictionaryEnumerator myEnumerator = myList.GetEnumerator();
    Console.WriteLine("\t-KEY-\t-VALUE-");
    while (myEnumerator.MoveNext()) {
        Console.WriteLine("\t{0}:\t{1}", myEnumerator.get_Key(),
            myEnumerator.get_Value());
    }
    Console.WriteLine();
} //PrintKeysAndValues

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

DnsPermission-Klasse
DnsPermission-Member
System.Net-Namespace