Many types of graphics resource are attached to a graphics device object. Their constructors take a CanvasDevice parameter, so in order to create such a resource you must first have access to a CanvasDevice.

But what if you don't have a CanvasDevice lying around handy? Much of the time, you will be dealing with a CanvasControl object instead. You can always get a CanvasDevice from a CanvasControl, so you could create resources like this:

var brush = new CanvasSolidColorBrush(canvasControl.Device, Colors.OliveDrab);

but it soon gets annoying having to keep typing ".Device" all over the place!

For those of us with less patience, ICanvasResourceCreator allows resource constructors to accept either a CanvasDevice OR a CanvasControl, so we can call them more conveniently:

var brush = new CanvasSolidColorBrush(canvasControl, Colors.MistyRose);

Reference