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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
)

Parameters

state
Type: System.Security.Permissions.PermissionState

One of the PermissionState values.

ExceptionCondition
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(S"Tag, Attributes and Values of 'DnsPermission' instance :");
      Console::WriteLine(S"\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(S"\n\t-KEY-\t-VALUE-");
      while (myEnumerator->MoveNext())
         Console::WriteLine(S"\t {0}:\t {1}", myEnumerator->Key, myEnumerator->Value);
      Console::WriteLine();
   }

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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