Szerkesztés

Megosztás a következőn keresztül:

DnsPermissionAttribute(SecurityAction) Constructor

  • Reference

Definition

Namespace:
System.Net
Assembly:
System.Security.Permissions.dll
Assembly:
System.dll
Package:
System.Security.Permissions v9.0.0
Source:
DnsPermissionAttribute.cs
Source:
DnsPermissionAttribute.cs
Source:
DnsPermissionAttribute.cs
Source:
DnsPermissionAttribute.cs

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

public:
 DnsPermissionAttribute(System::Security::Permissions::SecurityAction action);
public DnsPermissionAttribute (System.Security.Permissions.SecurityAction action);
new System.Net.DnsPermissionAttribute : System.Security.Permissions.SecurityAction -> System.Net.DnsPermissionAttribute
Public Sub New (action As SecurityAction)

Parameters

action
SecurityAction

One of the SecurityAction values.

Exceptions

ArgumentException

The action parameter is not a valid SecurityAction.

Examples

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 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() );
   }

}

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 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
   End Sub
End Class

Remarks

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

Applies to

See also