Lucene.Net.Search.SimpleFacetedSearch.Search C# (CSharp) Method

        public Hits Search(Query query, int maxDocPerGroup)
        {
            var hitsPerGroup = new List<HitsPerFacet>();

            DocIdSet queryDocidSet = new CachingWrapperFilter(new QueryWrapperFilter(query)).GetDocIdSet(_Reader);
            var actions = new Action[_Groups.Count];           
            for (int i = 0; i < _Groups.Count; i++)
            {
                var h = new HitsPerFacet(new FacetName(_Groups[i].Key.ToArray()), _Reader, queryDocidSet, _Groups[i].Value, maxDocPerGroup);
                hitsPerGroup.Add(h);
                actions[i] = h.Calculate;
            }
            
#if !NET35
            Parallel.Invoke(actions);
#else
            foreach (var action in actions)
                action();
#endif
            
            Hits hits = new Hits {HitsPerFacet = hitsPerGroup.ToArray()};

            return hits;
        }

        /// <summary>
        /// *****************************************************
        /// * SAMPLE USAGE                                      *
        /// *****************************************************
        /// </summary>
        void HowToUse(string searchString)
        {
            Query query = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "text", new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29)).Parse(searchString);

            SimpleFacetedSearch sfs = new SimpleFacetedSearch(_Reader, new string[] { "source", "category" });

            SimpleFacetedSearch.Hits hits = sfs.Search(query, 10);

            long totalHits = hits.TotalHitCount;

            foreach (SimpleFacetedSearch.HitsPerFacet hpg in hits.HitsPerFacet)
            {
                long hitCountPerGroup = hpg.HitCount;
                SimpleFacetedSearch.FacetName facetName = hpg.Name;
                for (int i = 0; i < facetName.Length; i++)
                {
                    string part = facetName[i];
                }
                foreach (Document doc in hpg.Documents)
                {
                    string text = doc.GetField("text").StringValue;
                    System.Diagnostics.Debug.WriteLine(">>" + facetName + ": " + text);
                }
            }
        }