WriteableBitmap Constructor (BitmapSource)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Assembly: System.Windows (in System.Windows.dll)
Public Sub New ( _ source As BitmapSource _ )
public WriteableBitmap( BitmapSource source )
The BitmapSource to use for initialization.
If source does not use a natively supported bitmap format, format conversions are applied for each frame update, which reduces performance.
If you use a BitmapImage as the source, remember that a BitmapImage constructed by a URL is initialized asynchronously. The default mode is DelayCreation, and in this case the image is possibly not being added to the visual tree and is thus not immediately requested for download. As such the image may be null and throws an exception in the constructor. It may be necessary to construct the image separately (using IgnoreImageCache), attach a handler for ImageOpened for the source, and only construct the WriteableBitmap once the ImageOpened event is handled.
Windows Phone OS
Supported in: 8.1, 8.0, 7.1, 7.0