C# IndexSearcher.Close方法代码示例

        public Data searchLucene(Data data)
        {
            Search_gl search = new Search_gl();
            List<string> item = new List<string>();
            Lucene.Net.Store.Directory directory = FSDirectory.Open(new DirectoryInfo(Environment.CurrentDirectory + "\\LuceneIndex"));
            var analyzer = new StandardAnalyzer(Version.LUCENE_29);

            IndexReader reader = IndexReader.Open(directory, true);
            IndexSearcher searcher = new IndexSearcher(reader);

            //QueryParser queryParser = new QueryParser(Version.LUCENE_29, "summary", analyzer);  //search for single field
            MultiFieldQueryParser parser = new MultiFieldQueryParser(new string[] {"name", "summary"}, analyzer);  //search for multifield
            Query query = parser.Parse((data.getString("search")) + "*"); //cant search blank text with wildcard as first character

            TopScoreDocCollector collector = TopScoreDocCollector.create(1000, true);
            searcher.Search(query, collector);
            ScoreDoc[] hits = collector.TopDocs().ScoreDocs;
            int count = hits.Length;

            for (int i = 0; i < count; i++)
            {
                int docId = hits[i].doc;
                float score = hits[i].score;

                Document doc = searcher.Doc(docId);

                string id = doc.Get("id");
                item.Add(id);
            }
            Data list = search.search(data, item.ToArray());
            reader.Close();
            searcher.Close();

            return list;
        }

		public virtual void  TestQuery()
		{
			RAMDirectory dir = new RAMDirectory();
			IndexWriter iw = new IndexWriter(dir, new StandardAnalyzer(), true);
			AddDoc("one", iw);
			AddDoc("two", iw);
			AddDoc("three four", iw);
			iw.Close();
			
			IndexSearcher is_Renamed = new IndexSearcher(dir);
			Hits hits = is_Renamed.Search(new MatchAllDocsQuery());
			Assert.AreEqual(3, hits.Length());
			
			// some artificial queries to trigger the use of skipTo():
			
			BooleanQuery bq = new BooleanQuery();
			bq.Add(new MatchAllDocsQuery(), BooleanClause.Occur.MUST);
			bq.Add(new MatchAllDocsQuery(), BooleanClause.Occur.MUST);
			hits = is_Renamed.Search(bq);
			Assert.AreEqual(3, hits.Length());
			
			bq = new BooleanQuery();
			bq.Add(new MatchAllDocsQuery(), BooleanClause.Occur.MUST);
			bq.Add(new TermQuery(new Term("key", "three")), BooleanClause.Occur.MUST);
			hits = is_Renamed.Search(bq);
			Assert.AreEqual(1, hits.Length());
			
			// delete a document:
			is_Renamed.GetIndexReader().DeleteDocument(0);
			hits = is_Renamed.Search(new MatchAllDocsQuery());
			Assert.AreEqual(2, hits.Length());
			
			is_Renamed.Close();
		}

        public void Initialize_Indexes_All_Nodes()
        {
            string elementIdForTestingSearch = _deepNodeFinder.GetNodesForIndexing()[0].Id;
            int expectedNumNodes = _deepNodeFinder.GetNodesForIndexing().Length;

            Assert.AreEqual("usfr-pte_NetCashFlowsProvidedUsedOperatingActivitiesDirectAbstract", elementIdForTestingSearch,
                            "TEST SANITY: element id for test search");
            Assert.AreEqual(1595, expectedNumNodes, "TEST SANITY: Number of nodes in found in the test taxonomy");

            IndexReader indexReader = IndexReader.Open(_indexMgr.LuceneDirectory_ForTesting);

            Assert.AreEqual(expectedNumNodes, indexReader.NumDocs(),
                            "An incorrect number of documents were found in the Lucene directory after initialization");

            IndexSearcher searcher = new IndexSearcher(_indexMgr.LuceneDirectory_ForTesting);
            try
            {
                Hits results =
                    searcher.Search(new TermQuery(new Term(LuceneNodeIndexer.ELEMENTID_FOR_DELETING_FIELD, elementIdForTestingSearch)));

                Assert.AreEqual(1, results.Length(), "Search results should only have 1 hit");
                Assert.AreEqual(elementIdForTestingSearch, results.Doc(0).Get(LuceneNodeIndexer.ELEMENTID_FIELD),
                                "Search results yielded the wrong element!");
            }
            finally
            {
                searcher.Close();
            }
        }

		public virtual void  TestSorting()
		{
			Directory directory = new MockRAMDirectory();
			IndexWriter writer = new IndexWriter(directory, new WhitespaceAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
			writer.SetMaxBufferedDocs(2);
			writer.SetMergeFactor(1000);
			writer.AddDocument(Adoc(new System.String[]{"id", "a", "title", "ipod", "str_s", "a"}));
			writer.AddDocument(Adoc(new System.String[]{"id", "b", "title", "ipod ipod", "str_s", "b"}));
			writer.AddDocument(Adoc(new System.String[]{"id", "c", "title", "ipod ipod ipod", "str_s", "c"}));
			writer.AddDocument(Adoc(new System.String[]{"id", "x", "title", "boosted", "str_s", "x"}));
			writer.AddDocument(Adoc(new System.String[]{"id", "y", "title", "boosted boosted", "str_s", "y"}));
			writer.AddDocument(Adoc(new System.String[]{"id", "z", "title", "boosted boosted boosted", "str_s", "z"}));
			
			IndexReader r = writer.GetReader();
			writer.Close();
			
			IndexSearcher searcher = new IndexSearcher(r);
			
			RunTest(searcher, true);
			RunTest(searcher, false);
			
			searcher.Close();
			r.Close();
			directory.Close();
		}

		// main search method
		private static IEnumerable<SampleData> _search(string searchQuery, string searchField = "") {
			// validation
			if (string.IsNullOrEmpty(searchQuery.Replace("*", "").Replace("?", ""))) return new List<SampleData>();

			// set up lucene searcher
			using (var searcher = new IndexSearcher(_directory, false)) {
				var hits_limit = 1000;
				var analyzer = new StandardAnalyzer(Version.LUCENE_29);

				// search by single field
				if (!string.IsNullOrEmpty(searchField)) {
					var parser = new QueryParser(Version.LUCENE_29, searchField, analyzer);
					var query = parseQuery(searchQuery, parser);
					var hits = searcher.Search(query, hits_limit).ScoreDocs;
					var results = _mapLuceneToDataList(hits, searcher);
					analyzer.Close();
					searcher.Close();
					searcher.Dispose();
					return results;
				}
				// search by multiple fields (ordered by RELEVANCE)
				else {
					var parser = new MultiFieldQueryParser
						(Version.LUCENE_29, new[] {"Id", "Name", "Description"}, analyzer);
					var query = parseQuery(searchQuery, parser);
					var hits = searcher.Search(query, null, hits_limit, Sort.INDEXORDER).ScoreDocs;
					var results = _mapLuceneToDataList(hits, searcher);
					analyzer.Close();
					searcher.Close();
					searcher.Dispose();
					return results;
				}
			}
		}

        public static LuceneResult MultiSearchBIMXchange(Dictionary<string,string> terms, int pageSize, int pageNumber)
        {
            var directory = FSDirectory.Open(new DirectoryInfo("LuceneIndex"));
            var booleanQuery = new BooleanQuery();
            foreach(var term in terms)
            {
                var query = new TermQuery(new Term(term.Key, term.Value));
                booleanQuery.Add(query,BooleanClause.Occur.MUST);
            }
            var searcher = new IndexSearcher(directory, true);

            var topDocs = searcher.Search(booleanQuery, 10);

            var docs = new List<Document>();
            var start = (pageNumber - 1) * pageSize;
            for (var i = start; i < start + pageSize && i < topDocs.TotalHits; i++)
            {
                var scoreDoc = topDocs.ScoreDocs[i];
                var docId = scoreDoc.doc;
                var doc = searcher.Doc(docId);
                docs.Add(doc);
            }

            searcher.Close();
            directory.Close();
            var result = new LuceneResult {Results = docs, TotalCount = topDocs.TotalHits};
            return result;
        }

        public override List<ISearchEntity> GetSearchResult(out int MatchCount)
        {
            Analyzer analyzer = new StandardAnalyzer();

            IndexSearcher searcher = new IndexSearcher(searchInfo.ConfigElement.IndexDirectory);
            MultiFieldQueryParser parserName = new MultiFieldQueryParser(new string[] { "title", "content", "keywords" }, analyzer);

            Query queryName = parserName.Parse(searchInfo.QueryString);

            Hits hits = searcher.Search(queryName);

            List<ISearchEntity> ResultList = new List<ISearchEntity>();

            for (int i = 0; i < hits.Length(); i++)
            {
                Document doc = hits.Doc(i);

                ResultList.Add((ISearchEntity)new NewsModel()
                {
                    EntityIdentity = Convert.ToInt32(doc.Get("newsid")),
                    Title = Convert.ToString(doc.Get("title")),
                    Content = Convert.ToString(doc.Get("content")),
                    Keywords = doc.Get("keywords")
                });
            }
            searcher.Close();

            MatchCount = hits.Length();
            return ResultList;
        }

        public SearchResults Find(string terms)
        {
            Directory directory = FSDirectory.GetDirectory("./index",false);
            // Now search the index:
            var isearcher = new IndexSearcher(directory);
            // Parse a simple query that searches for "text":
            //Query query = QueryParser.Parse("text", "fieldname", analyzer);
            var qp = new QueryParser("description", _analyzer);
            Query query = qp.Parse(terms);

            Hits hits = isearcher.Search(query);

            var sr = new SearchResults();

            // Iterate through the results:
            for (int i = 0; i < hits.Length(); i++)
            {
                Document hitDoc = hits.Doc(i);

                sr.Add(new Result() { Name = hitDoc.Get("name"), Description = hitDoc.Get("description") });
            }
            isearcher.Close();
            directory.Close();

            return sr;
        }

        private void btnExecuteSearch_Click(object sender, EventArgs e)
        {
            Directory indexDirectory = FSDirectory.Open(new System.IO.DirectoryInfo(tempPath));
            IndexSearcher searcher = new IndexSearcher(indexDirectory, true); // read-only=true

            // TODO: QueryParser support for Hebrew terms (most concerning issue is with acronyms - mid-word quotes)
            QueryParser qp = new QueryParser("content", analyzer);
            qp.SetDefaultOperator(QueryParser.Operator.AND);
            Query query = qp.Parse(txbSearchQuery.Text);

            ScoreDoc[] hits = searcher.Search(query, null, 1000).scoreDocs;

            // Iterate through the results:
            BindingList<SearchResult> l = new BindingList<SearchResult>();
            for (int i = 0; i < hits.Length; i++)
            {
                Document hitDoc = searcher.Doc(hits[i].doc);
                SearchResult sr = new SearchResult(hitDoc.GetField("title").StringValue(),
                    hitDoc.GetField("path").StringValue(), hits[i].score);
                l.Add(sr);
            }

            searcher.Close();
            indexDirectory.Close();

            dgvResults.DataSource = l;
        }

        public void HelloWorldTest()
        {
            Directory directory = new RAMDirectory();
            Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_29);
            IndexWriter writer = new IndexWriter(directory,
                analyzer,
                IndexWriter.MaxFieldLength.UNLIMITED);

            Document doc = new Document();
            doc.Add(new Field("id", "1", Field.Store.YES, Field.Index.NO));
            doc.Add(new Field("postBody", "sample test", Field.Store.YES, Field.Index.ANALYZED));
            writer.AddDocument(doc);
            writer.Optimize();
            writer.Commit();
            writer.Close();

            QueryParser parser = new QueryParser(Version.LUCENE_29, "postBody", analyzer);
            Query query = parser.Parse("sample test");

            //Setup searcher
            IndexSearcher searcher = new IndexSearcher(directory, true);
            //Do the search
            var hits = searcher.Search(query, null, 10);

            for (int i = 0; i < hits.TotalHits; i++)
            {
                var doc1 = hits.ScoreDocs[i];
            }

            searcher.Close();
            directory.Close();
        }

        public void TestBooleanQuerySerialization()
        {
            Lucene.Net.Search.BooleanQuery lucQuery = new Lucene.Net.Search.BooleanQuery();

            lucQuery.Add(new Lucene.Net.Search.TermQuery(new Lucene.Net.Index.Term("field", "x")), Occur.MUST);

            System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bf = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            bf.Serialize(ms, lucQuery);
            ms.Seek(0, System.IO.SeekOrigin.Begin);
            Lucene.Net.Search.BooleanQuery lucQuery2 = (Lucene.Net.Search.BooleanQuery)bf.Deserialize(ms);
            ms.Close();

            Assert.AreEqual(lucQuery, lucQuery2, "Error in serialization");

            Lucene.Net.Search.IndexSearcher searcher = new Lucene.Net.Search.IndexSearcher(dir, true);

            int hitCount = searcher.Search(lucQuery, 20).TotalHits;

            searcher.Close();
            searcher = new Lucene.Net.Search.IndexSearcher(dir, true);

            int hitCount2 = searcher.Search(lucQuery2, 20).TotalHits;

            Assert.AreEqual(hitCount, hitCount2, "Error in serialization - different hit counts");
        }

        public static LuceneResult SearchBIMXchange(string field, string key, int pageSize, int pageNumber)
        {
            const string luceneIndexPath = "C:\\LuceneIndex";

            var directory = FSDirectory.Open(new DirectoryInfo(luceneIndexPath));

            var analyzer = new StandardAnalyzer(Version.LUCENE_29);

            var parser = new QueryParser(Version.LUCENE_29, field, analyzer);
            var query = parser.Parse(String.Format("{0}*", key));

            var searcher = new IndexSearcher(directory, true);

            var topDocs = searcher.Search(query, 1000000);

            var docs = new List<Document>();
            var start = (pageNumber-1)*pageSize;
            for (var i = start; i < start + pageSize && i < topDocs.TotalHits; i++)
            {
                var scoreDoc = topDocs.ScoreDocs[i];
                var docId = scoreDoc.doc;
                var doc = searcher.Doc(docId);
                docs.Add(doc);
            }

            searcher.Close();
            directory.Close();
            var result = new LuceneResult {Results = docs, TotalCount = topDocs.TotalHits};
            return result;
        }

 protected int getHitCount(String fieldName, String searchString)
 {
     IndexSearcher searcher = new IndexSearcher(directory, true); //4
       Term t = new Term(fieldName, searchString);
       Query query = new TermQuery(t); //5
       int hitCount = TestUtil.hitCount(searcher, query); //6
       searcher.Close();
       return hitCount;
 }

    protected void Page_Load(object sender, EventArgs e)
    {

        //if (Session["KeyWords"] == null ? false : true)
        //{
        //    Response.Redirect("Search.aspx");
        //}
        String text = Session["KeyWords"].ToString();
        ChineseAnalyzer analyzer = new ChineseAnalyzer();
        TokenStream ts = analyzer.TokenStream("ItemName", new System.IO.StringReader(text));
        Lucene.Net.Analysis.Token token;
        try
        {
            int n = 0;
            while ((token = ts.Next()) != null)
            {
                this.lbMsg.Text += (n++) + "->" + token.TermText() + " " + token.StartOffset() + " " + token.EndOffset() + " " + token.Type() + "<br>";
                 //   Response.Write((n++) + "->" + token.TermText() + " " + token.StartOffset() + " "
                 //+ token.EndOffset() + " " + token.Type() + "<br>");
            }
        }
        catch
        {
            this.lbMsg.Text = "wrong";
        } 

       // Analyzer analyzer = new StandardAnalyzer();
        Directory directory = FSDirectory.GetDirectory(Server.MapPath("/indexFile/"), false);

        IndexSearcher isearcher = new IndexSearcher(directory);

        Query query;
        query = QueryParser.Parse(Session["KeyWords"].ToString(), "ItemName", analyzer);
        //query = QueryParser.Parse("2", "nid", analyzer);
        Hits hits = isearcher.Search(query);
        this.lbMsg.Text += "<font color=red>共找到" + hits.Length() + "条记录</font><br>";
        //Response.Write("<font color=red>共找到" + hits.Length() + "条记录</font><br>");

        for (int i = 0; i < hits.Length(); i++)
        {

            Document hitDoc = hits.Doc(i);
            this.lbMsg.Text += "编号：" + hitDoc.Get("ItemID").ToString() + "<br>"
                + "分类：" + hitDoc.Get("CategoryName").ToString() + "<br>"
                + "专题：" + hitDoc.Get("ProductName").ToString() + "<br>"
                + "标题：<a href=" + hitDoc.Get("visiturl").ToString() + ">" + hitDoc.Get("ItemName").ToString() + "</a><br>";
            //Response.Write("编号：" + hitDoc.Get("ItemID").ToString() + "<br>");
            //Response.Write("分类：" + hitDoc.Get("CategoryName").ToString() + "<br>");
            //Response.Write("标题：<a href=" + hitDoc.Get("visiturl").ToString() + ">" + hitDoc.Get("ItemName").ToString() + "</a><br>");
            //Response.Write("专题：" + hitDoc.Get("ProductName").ToString() + "<br>");
        }
        isearcher.Close();
        directory.Close();
    }

        public virtual ActionResult SearchIndex(string term)
        {
            //Setup indexer

            Directory directory = FSDirectory.GetDirectory("LuceneIndex", true);
            Analyzer analyzer = new StandardAnalyzer();
            IndexWriter writer = new IndexWriter(directory, analyzer, true);

            IndexReader red = IndexReader.Open(directory);
            int totDocs = red.MaxDoc();
            red.Close();

            foreach (var ticket in _ticketRepo.GetTicketsByProject(CurrentProject, 0, 1000).Items)
            {
                AddListingToIndex(ticket, writer);
            }

            writer.Optimize();
            //Close the writer
            writer.Close();

            //Setup searcher
            IndexSearcher searcher = new IndexSearcher(directory);
            MultiFieldQueryParser parser = new MultiFieldQueryParser(
                                         new string[] {
                                             "summary", "keyName" },
                                         analyzer);

            Query query = parser.Parse(term);
            Hits hits = searcher.Search(query);

            var tickets = new List<Ticket>();

            for (int i = 0; i < hits.Length(); i++)
            {
                Document doc = hits.Doc(i);

                int id = 0;
                if (int.TryParse(doc.Get("id"), out id))
                {
                    tickets.Add(_ticketRepo.GetTicketById(id));
                }
            }

            //Clean up everything
            searcher.Close();
            directory.Close();

            return View(new SearchIndexModel()
            {
                Tickets = tickets
            });
        }