DnsPermission.DnsPermission Constructor

Creates a new instance of the DnsPermission class that either allows unrestricted DNS access or disallows DNS access.

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

public:
DnsPermission (
	PermissionState state
)
public DnsPermission (
	PermissionState state
)
public function DnsPermission (
	state : PermissionState
)
Not applicable.

Parameters

state

One of the PermissionState values.

Exception typeCondition

ArgumentException

state is not a valid PermissionState value.

If state is Unrestricted, the DnsPermission instance passes all demands. If state contains any other value, the DnsPermission instance fails all demands.

The following example creates an instance of the DnsPermission class.

public:
   void useDns()
   {
      // Create a DnsPermission instance.
      DnsPermission^ permission = gcnew DnsPermission( PermissionState::Unrestricted );
      
      // Check for permission.
      permission->Demand();
      // Create a SecurityElement Object* to hold XML encoding of the DnsPermission instance.
      SecurityElement^ securityElementObj = permission->ToXml();
      Console::WriteLine( "Tag, Attributes and Values of 'DnsPermission' instance :" );
      Console::WriteLine( "\n\tTag : {0}", securityElementObj->Tag );
      // Print the attributes and values.
      PrintKeysAndValues( securityElementObj->Attributes );
   }

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

public void UseDns()
{
    // Create a DnsPermission instance.
    DnsPermission permission = new DnsPermission(PermissionState.
        Unrestricted);

    // Check for permission.
    permission.Demand();

    // Create a SecurityElement object to hold XML encoding of the
    // DnsPermission instance.
    SecurityElement securityElementObj = permission.ToXml();
    Console.WriteLine("Tag, Attributes and Values of 'DnsPermission' "
        + "instance :");
    Console.WriteLine("\n\tTag :" + securityElementObj.get_Tag());

    // Print the attributes and values.
    PrintKeysAndValues(securityElementObj.get_Attributes());
} //UseDns

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

Windows 98, Windows Server 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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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