Share Extension

hi,
i am trying to add my app to share extension in mac using xamarin,
was able to create share extension and add app in share extension
but now i want to read the path of the file that i want to share as my main app need it but
NSExtensionItem item = ExtensionContext.InputItems.First();
this returns me that array of files and in that array my file path as "public.file-url" and file name as " public.* "
can any one help me with that...