IPInterfaceProperties.MulticastAddresses Property

Definition

Namespace:

System.Net.NetworkInformation

Assembly:

System.Net.NetworkInformation.dll

Gets the multicast addresses assigned to this interface.

public:
 abstract property System::Net::NetworkInformation::MulticastIPAddressInformationCollection ^ MulticastAddresses { System::Net::NetworkInformation::MulticastIPAddressInformationCollection ^ get(); };

public abstract System.Net.NetworkInformation.MulticastIPAddressInformationCollection MulticastAddresses { get; }

member this.MulticastAddresses : System.Net.NetworkInformation.MulticastIPAddressInformationCollection

Public MustOverride ReadOnly Property MulticastAddresses As MulticastIPAddressInformationCollection

Property Value

MulticastIPAddressInformationCollection

An MulticastIPAddressInformationCollection that contains the multicast addresses for this interface.

Examples

The following code example displays the multicast addresses for the network interfaces on the local computer.

void DisplayMulticastAddresses()
{
   int count = 0;
   
   Console::WriteLine( "Multicast Addresses" );
   array<NetworkInterface^>^adapters = NetworkInterface::GetAllNetworkInterfaces();
   System::Collections::IEnumerator^ myEnum15 = adapters->GetEnumerator();
   while ( myEnum15->MoveNext() )
   {
      NetworkInterface ^ adapter = safe_cast<NetworkInterface ^>(myEnum15->Current);
      IPInterfaceProperties ^ adapterProperties = adapter->GetIPProperties();
      MulticastIPAddressInformationCollection ^ multiCast = adapterProperties->MulticastAddresses;
      if ( multiCast->Count > 0 )
      {
         Console::WriteLine( adapter->Description );
         System::Collections::IEnumerator^ myEnum16 = multiCast->GetEnumerator();
         while ( myEnum16->MoveNext() )
         {
            MulticastIPAddressInformation ^ multi = safe_cast<MulticastIPAddressInformation ^>(myEnum16->Current);
            Console::WriteLine( "  Multicast Address ....................... : {0} {1} {2}", 
               multi->Address, multi->IsTransient ? "Transient" : "", 
               multi->IsDnsEligible ? "DNS Eligible" : "" );
            count++;   
         }
         Console::WriteLine();
      }
   }
    if (count == 0)
    {
        Console::WriteLine("  No multicast addresses were found.");
        Console::WriteLine();
    }
}

public static void DisplayMulticastAddresses()
{
    int count = 0;

    Console.WriteLine("Multicast Addresses");
    NetworkInterface[] adapters  = NetworkInterface.GetAllNetworkInterfaces();
    foreach (NetworkInterface adapter in adapters)
    {
        IPInterfaceProperties adapterProperties = adapter.GetIPProperties();
        MulticastIPAddressInformationCollection multiCast = adapterProperties.MulticastAddresses;
        if (multiCast.Count > 0)
        {
            Console.WriteLine(adapter.Description);
            foreach (IPAddressInformation multi in multiCast)
            {
                Console.WriteLine("  Multicast Address ....................... : {0} {1} {2}",
                    multi.Address,
                    multi.IsTransient ? "Transient" : "",
                    multi.IsDnsEligible ? "DNS Eligible" : ""
                );
                count++;
            }
            Console.WriteLine();
        }
    }
    if (count == 0)
    {
        Console.WriteLine("  No multicast addressses were found.");
        Console.WriteLine();
    }
}

Public Shared Sub DisplayMulticastAddresses() 
    Dim count as Integer = 0
    
    Console.WriteLine("Multicast Addresses")
    Dim adapters As NetworkInterface() = NetworkInterface.GetAllNetworkInterfaces()
    Dim adapter As NetworkInterface
    For Each adapter In  adapters
        Dim adapterProperties As IPInterfaceProperties = adapter.GetIPProperties()
        Dim multiCast As MulticastIPAddressInformationCollection = adapterProperties.MulticastAddresses
        If multiCast.Count > 0 Then
            Console.WriteLine(adapter.Description)
            Dim multi As IPAddressInformation
            For Each multi In  multiCast
                Console.WriteLine("  Multicast Address ....................... : {0} {1} {2}", multi.Address, IIf(multi.IsTransient, "Transient", ""), IIf(multi.IsDnsEligible, "DNS Eligible", ""))
            'TODO: For performance reasons this should be changed to nested IF statements
            'TODO: For performance reasons this should be changed to nested IF statements
                count += 1
            Next multi
            Console.WriteLine()
        End If
    Next adapter

    if count = 0 then
        Console.WriteLine("  No multicast addresses were found.")
        Console.WriteLine()
    End if

End Sub

Remarks

A multicast address identifies multiple computers. Packets sent to a multicast address are sent to all computers identified by the address.