BitmapCache Class

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Represents the behavior of caching a visual element or tree of elements as bitmap surfaces. This can yield significant performance improvements for some scenarios.

Inheritance Hierarchy


Namespace: System.Windows.Media
Assembly: System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.


Public NotInheritable Class BitmapCache _
    Inherits CacheMode
public sealed class BitmapCache : CacheMode
<BitmapCache .../>

The BitmapCache type exposes the following members.


Name Description
BitmapCache Initializes a new instance of the BitmapCache class.



Name Description
Dispatcher Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
RenderAtScale Gets or sets the scale at which the object is rendered on the cached bitmap surface. Use this property for cached objects that are scaled to improve performance.



Name Description
CheckAccess Determines whether the calling thread has access to this object. (Inherited from DependencyObject.)
ClearValue Clears the local value of a dependency property. (Inherited from DependencyObject.)
Equals(Object) Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Finalize Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
GetAnimationBaseValue Returns any base value established for a Windows Phone dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
GetHashCode Serves as a hash function for a particular type. (Inherited from Object.)
GetType Gets the Type of the current instance. (Inherited from Object.)
GetValue Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
ReadLocalValue Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
SetValue Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
ToString Returns a string that represents the current object. (Inherited from Object.)



Name Description
RenderAtScaleProperty Identifies the RenderAtScale dependency property.



Using cached composition, you can cache visual elements as bitmaps after the first time they render. Once an object or tree of objects has been cached as a bitmap, it no longer goes through the render phase as the application refreshes, rather, just the cached bitmap is rendered. Such cached bitmap swapping can take advantage of hardware acceleration from the user’s GPU, which can yield significant performance improvements for some scenarios.


The following XAML uses a BitmapCache to set CacheMode for a MediaElement.

    <BitmapCache RenderAtScale="4"/>
  </ MediaElement.CacheMode>

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0


Windows Phone

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

See Also


System.Windows.Media Namespace