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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
)

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 = 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.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 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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