ArcGISPortalViewer.ViewModel.SearchViewModel.GetPortalItemsAsync C# (CSharp) Method

        private async Task<IEnumerable<object>> GetPortalItemsAsync(SearchParameters sp)
        {
            NoResults = false;

            // since GetPortalItemsAsync is called subsequently by the incremental loading collection,
            // always make sure the search text is valid. 
            if (!IsSearchQueryValid(SearchQuery))
            {
                NoResults = true;
                _totalHits = 0;
                return null;
            }

            var ps = PortalService.CurrentPortalService;
            if (PortalService.CurrentPortalService == null)
                return null;

            IsLoadingData = true;
            SearchResultInfo<ArcGISPortalItem> r = await ps.GetSearchResults(sp);
            IsLoadingData = false;

            // set NoResults each time to avoid false intermediate setting of
            // this depedency property
            if (r == null || r.TotalCount == 0 )
            {
                NoResults = true;
                _totalHits = 0;
                return null;
            }
            
            _totalHits = r.TotalCount;           
            return r.Results;
        }