How can I put the monitor to sleep when using C#/WPF (Not WinForms!)

Question

The trouble I'm having is with using...

[DllImport("user32")]
public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

...and then...

SendMessage(???, WM_SYSCOMMAND, (IntPtr)SC_MONITORPOWER, (IntPtr)MONITOR_OFF);

SendMessage wants the Form's Handle but I'm not using Forms so cannot get the Handle.

Is there any other way I can put the monitor to sleep OR get the Handle in WPF?

Answer 1

To get the Handle for a WPF Window use:

  new WindowInteropHelper(YourWPFWindow).Handle

MSDN reference

Answer 2

编写new WindowInteropHelper(someWindow).Handle

Answer 3

Or use

HwndSource source = (HwndSource)HwndSource.FromVisual(this);
source.Handle...

to get a handle from a single element in the form, also runs for the whole window.