private void RegisterCallback(IntPtr handle, Action <RasConnectionEventArgs> callback, RASCN changeNotification)
{
var stateObject = new RasConnectionNotificationStateObject();
IRegisteredCallback registeredCallback = null;
try
{
registeredCallback = callbackFactory.Create(callbackHandler.OnCallback, stateObject);
if (registeredCallback == null)
{
throw new InvalidOperationException("The factory did not register a callback.");
}
var ret = rasApi32.RasConnectionNotification(handle, registeredCallback.Handle, changeNotification);
if (ret != SUCCESS)
{
throw exceptionPolicy.Create(ret);
}
stateObject.RegisteredCallback = registeredCallback;
stateObject.Callback = callback;
stateObject.NotificationType = changeNotification;
notifications.Add(changeNotification, stateObject);
}
catch (Exception)
{
registeredCallback?.Dispose();
throw;
}
}
private void OnCallback(RasConnectionNotificationStateObject state)
{
lock (syncRoot)
{
var current = enumConnectionsService.EnumerateConnections().ToArray();
var changes = FindConnectionChanges(current);
if (changes.Any())
{
ExecuteCallbackForChanges(state.Callback, changes);
}
previousState = current;
}
}