public static IObserver CreateBindingSource(RelativeSourceInfo node, IDataContext context, [NotNull] object target, string pathEx)
{
if (target == null)
{
throw BindingExceptionManager.InvalidBindingTarget(node.Path);
}
string path = node.Path ?? string.Empty;
if (!string.IsNullOrEmpty(pathEx))
{
path = MergePath(path, pathEx);
}
if (node.Type != RelativeSourceInfo.SelfType)
{
if (node.Type == RelativeSourceInfo.ContextSourceType)
{
target = BindingServiceProvider.ContextManager.GetBindingContext(target);
}
else
{
target = new ParentSourceValue(target, node);
}
}
return(CreateBindingSource(context, path, target, false));
}
public ParentSourceValue(object target, RelativeSourceInfo node)
{
_node = node;
_isElementSource = _node.Type == RelativeSourceInfo.ElementSourceType;
_targetReference = ServiceProvider.WeakReferenceFactory(target);
_value = Empty.WeakReference;
IBindingMemberInfo rootMember = BindingServiceProvider.VisualTreeManager.GetRootMember(target.GetType());
if (rootMember != null)
{
_subscriber = rootMember.TryObserve(target, this);
}
TryHandle(null, null);
}