SystemEvents

SystemEvents

---

Microsoft.Win32 (system.dll)

sealed class

This class provides global events for select Windows operating system events. You can write event handlers to receive these. Some of the events include notifications that occur when user settings are changed ( DisplaySettingsChanged , TimeChanged , and UserPreferenceChanged ) or when the system state changes ( LowMemory , PowerModeChangedSessionEnded , and SessionEnding ). You can also receive notifications about new fonts ( InstalledFontsChanged ) and palette switching in 256- color mode ( PaletteChanged ).

System event handlers are executed on a different thread than the rest of your program. For this reason, code in the event handler must be thread-safe. If your event handler needs access to other objects from your program, you can use the static method InvokeOnEventsThread( ) to instantiate these objects on the system event listener thread. This way, they are easily accessible to the event handler code.

Do not perform time-consuming tasks in a system event handler, as it may cause problems with other applications that are also trying to handle the event.

 public sealed class  SystemEvents  {  // Public Static Methods  public static IntPtr  CreateTimer  (int   interval   );    public static void  InvokeOnEventsThread  (Delegate   method   );    public static void  KillTimer  (IntPtr   timerId   );  // Events  public event EventHandler  DisplaySettingsChanged  ;    public event EventHandler  EventsThreadShutdown  ;    public event EventHandler  InstalledFontsChanged  ;    public event EventHandler  LowMemory  ;    public event EventHandler  PaletteChanged  ;    public event PowerModeChangedEventHandler  PowerModeChanged  ;    public event SessionEndedEventHandler  SessionEnded  ;    public event SessionEndingEventHandler  SessionEnding  ;    public event EventHandler  TimeChanged  ;    public event TimerElapsedEventHandler  TimerElapsed  ;    public event UserPreferenceChangedEventHandler  UserPreferenceChanged  ;    public event UserPreferenceChangingEventHandler  UserPreferenceChanging  ; }