private IEnumerable <KeyValuePair <string, object> > GetPropertyValues(Type type, object obj, IEnumerable <string> filter = null)
        {
            IEnumerable <PropertyInfo> plist = type.GetCachedProperties();

            if (filter != null)
            {
                plist = plist.Where(x => filter.Contains(x.Name));
            }

            foreach (var item in plist)
            {
                yield return(new KeyValuePair <string, object>(item.Name, GenericMethods.GetProperty(obj, item)));
            }
        }