BitmapCacheOption Enumeration

BitmapCacheOption Enumeration

 

Specifies how a bitmap image takes advantage of memory caching.

Namespace:   System.Windows.Media.Imaging
Assembly:  PresentationCore (in PresentationCore.dll)

public enum BitmapCacheOption

Member nameDescription
Default

Caches the entire image into memory. This is the default value.

None

Do not create a memory store. All requests for the image are filled directly by the image file.

OnDemand

Creates a memory store for requested data only. The first request loads the image directly; subsequent requests are filled from the cache.

OnLoad

Caches the entire image into memory at load time. All requests for image data are filled from the memory store.

The following code example demonstrates how to load a BitmapImage and specify the BitmapCacheOption.

// Define a BitmapImage.
Image myImage = new Image();
BitmapImage bi = new BitmapImage();

// Begin initialization.
bi.BeginInit();

// Set properties.
bi.CacheOption = BitmapCacheOption.OnDemand;
bi.CreateOptions = BitmapCreateOptions.DelayCreation;
bi.DecodePixelHeight = 125;
bi.DecodePixelWidth = 125;
bi.Rotation = Rotation.Rotate90;
MessageBox.Show(bi.IsDownloading.ToString());
bi.UriSource = new Uri("smiley.png", UriKind.Relative);

// End initialization.
bi.EndInit();
myImage.Source = bi;
myImage.Stretch = Stretch.None;
myImage.Margin = new Thickness(5);

.NET Framework
Available since 3.0
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