/// <summary><para>
    ///    Provides support for ip configuation information and statistics.
    ///</para></summary>     
    ///
namespace System.Net.NetworkInformation {
 
    internal class SystemIPInterfaceStatistics : IPInterfaceStatistics {
 
        MibIfRow2 ifRow;
 
        internal SystemIPInterfaceStatistics(long index) {
            ifRow = GetIfEntry2(index);
        }
               
        public override long OutputQueueLength { get { return (long)ifRow.outQLen; } }
        public override long BytesSent { get { return (long)ifRow.outOctets; } }
        public override long BytesReceived { get { return (long)ifRow.inOctets; } }
        public override long UnicastPacketsSent { get { return (long)ifRow.outUcastPkts; } }
        public override long UnicastPacketsReceived { get { return (long)ifRow.inUcastPkts; } }
        public override long NonUnicastPacketsSent { get { return (long)ifRow.outNUcastPkts; } }
        public override long NonUnicastPacketsReceived { get { return (long)ifRow.inNUcastPkts; } }
        public override long IncomingPacketsDiscarded { get { return (long)ifRow.inDiscards; } }
        public override long OutgoingPacketsDiscarded { get { return (long)ifRow.outDiscards; } }
        public override long IncomingPacketsWithErrors { get { return (long)ifRow.inErrors; } }
        public override long OutgoingPacketsWithErrors { get { return (long)ifRow.outErrors; } }
        public override long IncomingUnknownProtocolPackets { get { return (long)ifRow.inUnknownProtos; } }
 
        internal static MibIfRow2 GetIfEntry2(long index) {
            MibIfRow2 ifRow = new MibIfRow2();
            if (index == 0 ) {
                return ifRow;
            }
            ifRow.interfaceIndex = (uint)index;
            uint result = UnsafeNetInfoNativeMethods.GetIfEntry2(ref ifRow);
            if (result != IpHelperErrors.Success) {
                throw new NetworkInformationException((int)result);
            }
            return ifRow;
        }
    }
 
    /// Despite the naming, the results are not IPv4 specific.
    /// Do not use this class, use SystemIPInterfaceStatistics instead.
    /// <summary>IP statistics</summary>
    internal class SystemIPv4InterfaceStatistics:IPv4InterfaceStatistics {
 
        MibIfRow2 ifRow;
 
        internal SystemIPv4InterfaceStatistics(long index){
            ifRow = SystemIPInterfaceStatistics.GetIfEntry2(index);
        }
 
        public override long OutputQueueLength { get { return (long)ifRow.outQLen; } }
        public override long BytesSent { get { return (long)ifRow.outOctets; } }
        public override long BytesReceived { get { return (long)ifRow.inOctets; } }
        public override long UnicastPacketsSent { get { return (long)ifRow.outUcastPkts; } }
        public override long UnicastPacketsReceived { get { return (long)ifRow.inUcastPkts; } }
        public override long NonUnicastPacketsSent { get { return (long)ifRow.outNUcastPkts; } }
        public override long NonUnicastPacketsReceived { get { return (long)ifRow.inNUcastPkts; } }
        public override long IncomingPacketsDiscarded { get { return (long)ifRow.inDiscards; } }
        public override long OutgoingPacketsDiscarded { get { return (long)ifRow.outDiscards; } }
        public override long IncomingPacketsWithErrors { get { return (long)ifRow.inErrors; } }
        public override long OutgoingPacketsWithErrors { get { return (long)ifRow.outErrors; } }
        public override long IncomingUnknownProtocolPackets { get { return (long)ifRow.inUnknownProtos; } }
    }
}