Export (0) Print
Expand All
This topic has not yet been rated - Rate this topic

DnsPermissionAttribute Constructor

Initializes a new instance of the DnsPermissionAttribute class with the specified SecurityAction value.

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

public DnsPermissionAttribute (
	SecurityAction action
)
public DnsPermissionAttribute (
	SecurityAction action
)
public function DnsPermissionAttribute (
	action : SecurityAction
)

Parameters

action

One of the SecurityAction values.

Exception typeCondition

ArgumentException

The action parameter is not a valid SecurityAction.

The SecurityAction value that is passed to this constructor specifies the allowable DnsPermissionAttribute targets.

The following example uses DnsPermissionAttribute to apply declarative security to a custom class.

//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.
/** @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

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
Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

ADD
Show:
© 2014 Microsoft. All rights reserved.