VirtualizingPanel::CacheLength Attached Property
Gets or sets the size of the cache before and after the viewport when the VirtualizingPanel is virtualizing.
Assembly: PresentationFramework (in PresentationFramework.dll)
The cache is the amount of space above or below the viewport in which items are not virtualized. Use a cache to avoid generating UI elements as they’re scrolled into view. The CacheLengthUnit property determines the unit of measurement that is used by .