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DnsPermission.Copy Method

Creates an identical copy of the current permission instance.

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

public override IPermission Copy()

Return Value

Type: System.Security.IPermission
A new instance of the DnsPermission class that is an identical copy of the current instance.

Implements

IPermission.Copy()

A copy of a DnsPermission instance provides the same access to DNS servers as the original permission instance.

The following example creates an identical copy of an existing DnsPermission instance.

public void UseDns() {
   // Create a DnsPermission instance.
   DnsPermission myPermission = new DnsPermission(PermissionState.Unrestricted);
   // Check for permission.
   myPermission.Demand();
   // Create an identical copy of the above 'DnsPermission' object.
   DnsPermission myPermissionCopy = (DnsPermission)myPermission.Copy();
   Console.WriteLine("Attributes and Values of 'DnsPermission' instance :");
   // Print the attributes and values.
   PrintKeysAndValues(myPermission.ToXml().Attributes);
   Console.WriteLine("Attribute and values of copied instance :");
   PrintKeysAndValues(myPermissionCopy.ToXml().Attributes);
}

private void PrintKeysAndValues(Hashtable myHashtable) {
   // Get the enumerator that can iterate through the hash table.
   IDictionaryEnumerator myEnumerator = myHashtable.GetEnumerator();
   Console.WriteLine("\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* myPermission = new DnsPermission(PermissionState::Unrestricted);
      // Check for permission.
      myPermission->Demand();
      // Create an identical copy of the above 'DnsPermission' Object*.
      DnsPermission* myPermissionCopy = dynamic_cast<DnsPermission*>(myPermission->Copy());
      Console::WriteLine(S"Attributes and Values of 'DnsPermission' instance :");
      // Print the attributes and values.
      PrintKeysAndValues(myPermission->ToXml()->Attributes);
      Console::WriteLine(S"Attribute and values of copied instance :");
      PrintKeysAndValues(myPermissionCopy->ToXml()->Attributes);
   }

private:
   void PrintKeysAndValues(Hashtable* myHashtable) 
   {
      // Get the enumerator that can iterate through the hash table.
      IDictionaryEnumerator* myEnumerator = myHashtable->GetEnumerator();
      Console::WriteLine(S"\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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