/// <summary>
/// get an enumerable of network interfaces that have disconnected since the last status.
/// </summary>
/// <param name="lastStatus">last network status snapshot</param>
/// <returns></returns>
public IEnumerable <NetworkInterface> AddressChange(NetworkStatus lastStatus)
{
// enumerate the current snapshot values.
var result = new List <NetworkInterface>();
foreach (var pair in _status)
{
// check this network interface was in the last snapshot:
if (lastStatus._status.ContainsKey(pair.Key))
{
//if (pair.Value.Interface.Description.ToUpper().StartsWith("MICROSOFT")) continue;
// check if the status changed...
var lastAddress = lastStatus._status[pair.Key].Interface.GetIPProperties().UnicastAddresses;
var address = pair.Value.Interface.GetIPProperties().UnicastAddresses;
//lastAddress[0].Address.ToString();
try
{
if (lastAddress[0].Address.ToString() != address[0].Address.ToString())
{
// this network interface has changed since the last snapshot:
result.Add(pair.Value.Interface);
}
}
catch (Exception exception)
{
continue;
}
try
{
if (lastAddress[1].Address.ToString() != address[1].Address.ToString())
{
// this network interface has changed since the last snapshot:
result.Add(pair.Value.Interface);
}
}
catch (Exception exception)
{
continue;
}
}
else
{
// this network interface is new..
result.Add(pair.Value.Interface);
}
}
return(result);
}
/// <summary>
/// list of network interfaces that have become faster.
/// </summary>
/// <param name="lastStatus"></param>
/// <returns></returns>
public IEnumerable <NetworkInterface> Faster(NetworkStatus lastStatus)
{
foreach (var status in _status)
{
if (lastStatus._status.ContainsKey(status.Key))
{
// if the last recorded interface speed was less than the current speeed, then
// this interface is now faster.
if (lastStatus._status[status.Key].Speed < status.Value.Speed)
{
yield return(status.Value.Interface);
}
}
}
}
/// <summary>
/// the task given to the monitor thread.
/// </summary>
private void MonitorTask()
{
// loop while the run flag is true.
while (_run)
{
try
{
// has the last status been taken?
if (_last == null)
{
// snapshot the current status.
_last = new NetworkStatus();
// sleep for the duration of the poll interval.
Thread.Sleep(_waitInterval);
// run to the next iteration.
continue;
}
// get the current network status:
var current = new NetworkStatus();
// test for changes and raise events where neccessary.
if (NetworkInterfaceConnected != null && _monitorNewConnections)
{
// evaluate all the network interfaces that have connected since the
// last snapshot
foreach (NetworkInterface ni in current.Connected(_last))
{
// test if the network interface was in the last snapshot:
OperationalStatus lastStatus = OperationalStatus.NotPresent;
if (_last.Contains(ni.Id))
{
lastStatus = _last[ni.Id].OperationalStatus;
}
// raise the interface connected event:
NetworkInterfaceConnected(this, new StatusMonitorEventArgs
{
EventType = StatusMonitorEventType.Connected,
Interface = ni,
LastOperationalStatus = lastStatus
});
}
}
// test for interface dis-connections
if (NetworkInterfaceDisconnected != null && _monitorDisconnections)
{
// enumerate the network interfaces that were Up but are not now.
foreach (NetworkInterface ni in current.Disconnected(_last))
{
// raise the interface dis-connected event:
NetworkInterfaceDisconnected(this, new StatusMonitorEventArgs
{
// set the event-type, interface and last status.
EventType =
StatusMonitorEventType.Disconnected,
Interface = ni,
LastOperationalStatus = OperationalStatus.Up
});
}
}
// test for interface changes.
if (NetworkInterfaceChanged != null && _monitorAnyStatusChange)
{
// enumerate the interfaces that have changed status in any way since
// the last snapshot.
foreach (NetworkInterface ni in current.Changed(_last))
{
// find the last status of the interface:
OperationalStatus lastStatus = OperationalStatus.NotPresent;
if (_last.Contains(ni.Id))
{
lastStatus = _last[ni.Id].OperationalStatus;
}
// raise the interface changed event:
NetworkInterfaceChanged(this, new StatusMonitorEventArgs
{
// set the event-type interface and last status.
EventType = StatusMonitorEventType.Changed,
Interface = ni,
LastOperationalStatus = lastStatus
});
}
}
if (NetworkAddressChanged != null && _monitorNetworkAddressChanged)
{
// enumerate the interfaces that have changed status in any way since
// the last snapshot.
foreach (NetworkInterface ni in current.AddressChange(_last))
{
// find the last status of the interface:
OperationalStatus lastStatus = OperationalStatus.NotPresent;
if (_last.Contains(ni.Id))
{
lastStatus = _last[ni.Id].OperationalStatus;
}
// raise the interface changed event:
NetworkAddressChanged(this, new StatusMonitorEventArgs
{
// set the event-type interface and last status.
EventType = StatusMonitorEventType.AddressChanged,
Interface = ni,
LastOperationalStatus = lastStatus
});
}
}
// set last to the current.
_last = current;
// wait...
if (_run)
{
Thread.Sleep(_waitInterval);
}
// pulse any threads waiting in WaitForPoll.
lock (_pulse)
Monitor.PulseAll(_pulse);
}
catch (Exception exception)
{
// handle the exception....(real exception handler should go here)
Console.WriteLine(exception.ToString());
//// increment the exception counter.
//Interlocked.Increment(ref _exceptionCount);
}
}
}
