DnsPermissionAttribute-Konstruktor

Initialisiert eine neue Instanz der DnsPermissionAttribute-Klasse mit dem angegebenen SecurityAction-Wert.

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

Syntax

'Declaration
Public Sub New ( _
    action As SecurityAction _
)
'Usage
Dim action As SecurityAction

Dim instance As New DnsPermissionAttribute(action)

public DnsPermissionAttribute (
    SecurityAction action
)

public:
DnsPermissionAttribute (
    SecurityAction action
)

public DnsPermissionAttribute (
    SecurityAction action
)

public function DnsPermissionAttribute (
    action : SecurityAction
)

Parameter

• action
  Einer der SecurityAction-Werte.

Ausnahmen

Hinweise

Der diesem Konstruktor übergebene SecurityAction-Wert gibt die zulässigen DnsPermissionAttribute-Ziele an.

Beispiel

Im folgenden Beispiel wird die deklarative Sicherheit mithilfe von DnsPermissionAttribute auf eine benutzerdefinierte Klasse angewendet.

' Uses the DnsPermissionAttribute to restrict access only to those who have permission.
<DnsPermission(SecurityAction.Demand, Unrestricted := true)>  _
Public Class MyClass1
   
   Public Shared Function GetIPAddress() As IPAddress
      Dim ipAddress As IPAddress = Dns.Resolve("localhost").AddressList(0)
      Return ipAddress
   End Function 'GetIPAddress
   
   Public Shared Sub Main()
      Try
         ' Grants Access.
         Console.WriteLine(("Access granted" + ControlChars.NewLine + " The local host IP Address is :" + MyClass1.GetIPAddress().ToString()))
      ' Denies Access.
      Catch securityException As SecurityException
         Console.WriteLine("Access denied")
         Console.WriteLine(securityException.ToString())
      End Try

//Uses the DnsPermissionAttribute to restrict access only to those who have permission.
[DnsPermission(SecurityAction.Demand, Unrestricted = true)]
public class MyClass{

public static IPAddress GetIPAddress(){
     IPAddress ipAddress = Dns.Resolve("localhost").AddressList[0];
     return ipAddress;
}
public static void Main(){
try{
     //Grants Access.
     Console.WriteLine(" Access granted\n The local host IP Address is :" + 
                                  MyClass.GetIPAddress().ToString());
}
// Denies Access.
catch(SecurityException securityException){
     Console.WriteLine("Access denied");    
     Console.WriteLine(securityException.ToString());
}

//Uses the DnsPermissionAttribute to restrict access only to those who have permission.

[DnsPermission(SecurityAction::Demand,Unrestricted=true)]
public ref class MyClass
{
public:
   static IPAddress^ GetIPAddress()
   {
      IPAddress^ ipAddress = Dns::Resolve( "localhost" )->AddressList[ 0 ];
      return ipAddress;
   }

};

int main()
{
   try
   {
      
      //Grants Access.
      Console::WriteLine( " Access granted\n The local host IP Address is :{0}", MyClass::GetIPAddress() );
   }
   // Denies Access.
   catch ( SecurityException^ securityException ) 
   {
      Console::WriteLine( "Access denied" );
      Console::WriteLine( securityException->ToString() );
   }

}

// Uses the DnsPermissionAttribute to restrict access only to those who 
// have permission.
/** @attribute DnsPermission(SecurityAction.Demand, Unrestricted = true)
 */
public class MyClass
{
    public static IPAddress GetIPAddress()
    {
        IPAddress ipAddress = (IPAddress)Dns.Resolve(
            "localhost").get_AddressList().get_Item(0);

        return ipAddress;
    } //GetIPAddress

    public static void main(String[] args)
    {
        try {
            //Grants Access.
            Console.WriteLine(" Access granted\n The local host IP " 
                + "Address is :" + MyClass.GetIPAddress().ToString());
        }
        // Denies Access.
        catch (System.Security.SecurityException securityException) {
            Console.WriteLine("Access denied");
            Console.WriteLine(securityException.ToString());
        }
    } //main
} //MyClass

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

DnsPermissionAttribute-Klasse
DnsPermissionAttribute-Member
System.Net-Namespace
SecurityAction