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BitmapCacheOption Enumeration

Specifies how a bitmap image takes advantage of memory caching.

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

'Declaration
Public Enumeration BitmapCacheOption
'Usage
Dim instance As BitmapCacheOption
<object property="enumerationMemberName" .../>

Member nameDescription
DefaultCaches the entire image into memory. This is the default value.
OnDemandCreates a memory store for requested data only. The first request loads the image directly; subsequent requests are filled from the cache.
OnLoadCaches the entire image into memory at load time. All requests for image data are filled from the memory store.
NoneDo not create a memory store. All requests for the image are filled directly by the image file.

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

' Define a BitmapImage. 
Dim myImage As New Image()
Dim bi As 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)

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0

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