Visual Basic® 2010 Unleashed

Applying a BitmapCacheBrush

WPF 4 introduces the concept of cached composition, which provides the ability of storing a visual element to a cache so that redrawing an element is faster and provides better performance instead of rendering the graphic element each time it needs to be used. Among the others, with cached composition you can cache images to apply as a brush. This is accomplished by first declaring a BitmapCache object that establishes the rules for caching the desired object and then by applying a BitmapCacheBrush to the visual element. The following code demonstrates how to apply a BitmapCacheBrush as the background of two TextBlock controls, by using cached composition (comments in the code will help you understand better):

The ...