3 references to IsHandleNull
PresentationCore (3)
System\Windows\Input\MouseDevice.cs (1)
2070if (source != null && source.CompositionTarget != null && !source.IsHandleNull)
System\Windows\Input\Stylus\Wisp\WispLogic.cs (1)
2920if (source != null && source.CompositionTarget != null && !source.IsHandleNull)
System\Windows\Input\Stylus\Wisp\WispStylusDevice.cs (1)
1502hwndSource == null || hwndSource.IsHandleNull)