public static DocumentNode GetExpressionFromString(string text, XamlDocument document, DocumentNode parentNode, Type propertyType, out IList <XamlParseError> errors)
 {
     if (parentNode != null)
     {
         IType type = document.TypeResolver.GetType(propertyType);
         return(XamlParser.ParseValue((IDocumentRoot)document, parentNode, type, text, out errors));
     }
     errors = (IList <XamlParseError>)null;
     return((DocumentNode)null);
 }