public override void Dispose()
{
try
{
VerifyAccess();
if (!IsDisposed)
{
if (_hostVisual != null && _connected)
{
RootVisual = null;
//
// Unregister this CompositionTarget from the MediaSystem.
//
// we need to properly unregister in a disconnected state
MediaContext.UnregisterICompositionTarget(Dispatcher, this);
}
}
}
finally
{
base.Dispose();
}
}
/// <summary>
/// This function gets called when VisualTarget is created on the channel
/// i.e. from CreateUCEResources.
/// </summary>
private void BeginHosting()
{
Debug.Assert(!_connected);
try
{
//
// Initiate hosting by the specified host visual.
//
_hostVisual.BeginHosting(this);
_connected = true;
}
catch
{
//
// If exception has occurred after we have registered with
// MediaContext, we need to unregister to properly release
// allocated resources.
// NOTE: We need to properly unregister in a disconnected state
//
MediaContext.UnregisterICompositionTarget(Dispatcher, this);
throw;
}
}