How to get current controller and action from inside Child action?

Question

And if you want to access this from within the child action itself (rather than the view) you can use

ControllerContext.ParentActionViewContext.RouteData.Values["action"] 

Found it...

how-do-i-get-the-routedata-associated-with-the-parent-action-in-a-partial-view

ViewContext.ParentActionViewContext.RouteData.Values["action"]

If the partial is inside another partial, this won't work unless we find the top most parent view content. You can find it with this:

var parentActionViewContext = ViewContext.ParentActionViewContext;
while (parentActionViewContext.ParentActionViewContext != null)
{
    parentActionViewContext = parentActionViewContext.ParentActionViewContext;
}

I had the same problem and came up with same solution as Carlos Martinez, except I turned it into an extension:

public static class ViewContextExtension
{
    public static ViewContext TopmostParent(this ViewContext context)
    {
        ViewContext result = context;
        while (result.ParentActionViewContext != null)
        {
            result = result.ParentActionViewContext;
        }
        return result;
    }
}

I hope this will help others who have the same problem.