Initiates shutdown of the Dispatcher asynchronously.
Assembly: WindowsBase (in WindowsBase.dll)
demands unrestricted UI Permissions.
The Dispatcher does not shut down completely until the event queue unwinds.
Once the shutdown process begins, all pending work items in the queue are aborted.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)