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));
}
/// <summary>
/// Updates the relative source value.
/// </summary>
public void UpdateSource([NotNull] object target)
{
if (target == null)
{
throw BindingExceptionManager.InvalidBindingTarget(RelativeSourceNode.Path);
}
var path = RelativeSourceNode.Path ?? String.Empty;
if (!String.IsNullOrEmpty(Path))
{
path = BindingExtensions.MergePath(path, Path);
}
if (RelativeSourceNode.Type != RelativeSourceExpressionNode.SelfType)
{
if (RelativeSourceNode.Type == RelativeSourceExpressionNode.MemberSourceType)
{
target = BindingServiceProvider.ContextManager.GetBindingContext(target);
}
else
{
target = new ParentSourceValue(target, RelativeSourceNode);
}
}
IObserver observer = BindingServiceProvider.ObserverProvider.Observe(target, BindingPath.Create(path), false);
_bindingSource = new BindingSource(observer);
}
