/// <summary> /// Starts listening for notifications in the specified registry key. /// /// Each part of the key must be provided separately so that the watcher /// can open its own handle. /// </summary> /// <param name="hive">The hive to watch</param> /// <param name="view">The view to watch</param> /// <param name="key">The key to watch</param> /// <param name="handler">The event handler to invoke</param> /// <param name="recursive">True to watch all subkeys as well</param> /// <param name="notifyValueChange"> /// True to notify if a value is added, removed or updated. /// </param> /// <param name="notifyKeyChange"> /// True to notify if a subkey is added or removed. /// </param> /// <param name="tag"> /// An arbitrary identifier to include with any raised events. /// </param> /// <returns>An opaque token that can be pased to Remove.</returns> public object Add(RegistryHive hive, RegistryView view, string key, RegistryChangedEventHandler handler, bool recursive = false, bool notifyValueChange = true, bool notifyKeyChange = true, object tag = null) { if (key == null) { throw new ArgumentNullException("key"); } if (handler == null) { throw new ArgumentNullException("handler"); } if (!(notifyValueChange | notifyKeyChange)) { throw new InvalidOperationException("Must wait for at least one type of change"); } var args = new RegistryChangedEventArgs( hive, view, key, recursive, notifyValueChange, notifyKeyChange, tag ); int currentWatcher = -1; RegistryWatcher watcher; var token = AddInternal(handler, args); while (token == null) { if (_extraWatchers == null) { _extraWatchers = new List <RegistryWatcher>(); } currentWatcher += 1; if (currentWatcher >= _extraWatchers.Count) { watcher = new RegistryWatcher(); _extraWatchers.Add(watcher); } else { watcher = _extraWatchers[currentWatcher]; } token = watcher.AddInternal(handler, args); } return(token); }
/// <summary> /// Invokes the associated event handler. /// </summary> /// <returns>True if the watcher will be run again; false if the /// entry has been closed and can be removed.</returns> public bool Invoke(RegistryWatcher sender) { if (_key == null) { // Returns true so we don't try and remove null entries from // the list. return(true); } if (!_registered) { return(false); } _callback(sender, _args); if (_args.CancelWatcher) { Unregister(); return(false); } lock (this) { // only re-register if we haven't been closed if (_registered) { try { Register(); } catch (Win32Exception ex) { // If we fail to re-register (probably because the // key has been deleted), there's nothing that can // be done. Fail if we're debugging, otherwise just // continue without registering the watcher again. Debug.Fail("Error registering registry watcher: " + ex.ToString()); _registered = false; } } } return(true); }
/// <summary> /// Invokes the associated event handler. /// </summary> /// <returns>True if the watcher will be run again; false if the /// entry has been closed and can be removed.</returns> public bool Invoke(RegistryWatcher sender) { if (_key == null) { // Returns true so we don't try and remove null entries from // the list. return true; } if (!_registered) { return false; } _callback(sender, _args); if (_args.CancelWatcher) { Unregister(); return false; } lock (this) { // only re-register if we haven't been closed if (_registered) { try { Register(); } catch (Win32Exception ex) { // If we fail to re-register (probably because the // key has been deleted), there's nothing that can // be done. Fail if we're debugging, otherwise just // continue without registering the watcher again. Debug.Fail("Error registering registry watcher: " + ex.ToString()); _registered = false; } } } return true; }
/// <summary> /// Starts listening for notifications in the specified registry key. /// /// Each part of the key must be provided separately so that the watcher /// can open its own handle. /// </summary> /// <param name="hive">The hive to watch</param> /// <param name="view">The view to watch</param> /// <param name="key">The key to watch</param> /// <param name="handler">The event handler to invoke</param> /// <param name="recursive">True to watch all subkeys as well</param> /// <param name="notifyValueChange"> /// True to notify if a value is added, removed or updated. /// </param> /// <param name="notifyKeyChange"> /// True to notify if a subkey is added or removed. /// </param> /// <param name="tag"> /// An arbitrary identifier to include with any raised events. /// </param> /// <returns>An opaque token that can be pased to Remove.</returns> public object Add(RegistryHive hive, RegistryView view, string key, RegistryChangedEventHandler handler, bool recursive = false, bool notifyValueChange = true, bool notifyKeyChange = true, object tag = null) { if (key == null) { throw new ArgumentNullException("key"); } if (handler == null) { throw new ArgumentNullException("handler"); } if (!(notifyValueChange | notifyKeyChange)) { throw new InvalidOperationException("Must wait for at least one type of change"); } var args = new RegistryChangedEventArgs( hive, view, key, recursive, notifyValueChange, notifyKeyChange, tag ); int currentWatcher = -1; RegistryWatcher watcher; var token = AddInternal(handler, args); while (token == null) { if (_extraWatchers == null) { _extraWatchers = new List<RegistryWatcher>(); } currentWatcher += 1; if (currentWatcher >= _extraWatchers.Count) { watcher = new RegistryWatcher(); _extraWatchers.Add(watcher); } else { watcher = _extraWatchers[currentWatcher]; } token = watcher.AddInternal(handler, args); } return token; }