/// <summary>
/// Starts the watcher raising events.
/// </summary>
private void StartRaisingEvents()
{
// Retrieve the current state of the connections on the machine. This is used for comparisons to determine what has changed
// once the events are raised.
this._lastState = RasConnection.GetActiveConnections();
try
{
this.Register(NativeMethods.RASCN.Connection, NativeMethods.INVALID_HANDLE_VALUE);
if (this.Handle == null || this.Handle.IsInvalid)
{
this.Register(NativeMethods.RASCN.Disconnection, NativeMethods.INVALID_HANDLE_VALUE);
}
else
{
this.Register(NativeMethods.RASCN.Disconnection, this.Handle);
this.Register(NativeMethods.RASCN.BandwidthAdded, this.Handle);
this.Register(NativeMethods.RASCN.BandwidthRemoved, this.Handle);
}
}
catch (EntryPointNotFoundException)
{
ThrowHelper.ThrowNotSupportedException(Resources.Exception_NotSupportedOnPlatform);
}
}
private void ConnectionStateChanged(object obj, bool timedOut)
{
lock (this.lockObject)
{
if (this.EnableRaisingEvents)
{
try
{
// Retrieve the active connections to compare against the last state that was checked.
ReadOnlyCollection <RasConnection> connections = RasConnection.GetActiveConnections();
RasConnection connection = null;
switch (((RasConnectionWatcherStateObject)obj).ChangeType)
{
case NativeMethods.RASCN.Connection:
connection = FindEntry(connections, this._lastState);
if (connection != null)
{
this.OnConnected(new RasConnectionEventArgs(connection));
}
this._lastState = connections;
break;
case NativeMethods.RASCN.Disconnection:
// The handle has not been set or it's invalid, the item that has disconnected will need to be
// determined.
connection = FindEntry(this._lastState, connections);
if (connection != null)
{
this.OnDisconnected(new RasConnectionEventArgs(connection));
}
if (this.Handle != null)
{
// The handle that was being monitored has been disconnected.
this.Handle = null;
}
this._lastState = connections;
break;
case NativeMethods.RASCN.BandwidthAdded:
if (this.Handle != null && !this.Handle.IsInvalid)
{
this.OnBandwidthAdded(EventArgs.Empty);
}
break;
case NativeMethods.RASCN.BandwidthRemoved:
if (this.Handle != null && !this.Handle.IsInvalid)
{
this.OnBandwidthRemoved(EventArgs.Empty);
}
break;
}
}
catch (Exception ex)
{
this.OnError(new System.IO.ErrorEventArgs(ex));
}
}
}
}
