Assembly: System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.
Dependency property identifier field: UriSourceProperty
The property is interpreted as a Uniform Resource Identifier (URI). This is in contrast to an Internationalized Resource Identifier (IRI). This distinction means that characters used to identify a file that are outside of US-ASCII will need to be encoded.
Relative references are permitted. The starting location for the relative reference is the installation folder of the application.
The format-specific file name extensions such as .png are not necessarily required to be in the URI, but if the retrieved file is determined not to be a valid image format, a run-time exception is thrown.
If you use this API in your app, you must specify the following capabilities in the app manifest. Otherwise, your app might not work correctly or it might exit unexpectedly.
Windows Phone 8, Windows Phone OS 7.1
For more info, see App capabilities and hardware requirements for Windows Phone 8.