Hi,
I'm trying to highlight the keyword in the search result.
This is my code:
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string indexdir = @"D:\temp\index_testing";
if (System.IO.Directory.Exists(indexdir))
System.IO.Directory.Delete(indexdir, true);
IndexWriter writer = new IndexWriter(indexdir, new
Lucene.Net.Analysis.Standard.StandardAnalyzer(), true);
// demo text
string scontent = "First, we parse the user-entered query string
indicating that we want to match ...";
for (int i = 0; i < 100; i++)
{
Document doc = new Document();
doc.Add(new Field("ID", i.ToString(), Field.Store.YES,
Field.Index.UN_TOKENIZED));
doc.Add(new Field("CONTENT", scontent, Field.Store.YES,
Field.Index.TOKENIZED));
writer.AddDocument(doc);
}
writer.Close();
IndexReader reader = IndexReader.Open(indexdir);
Searcher searcher = new IndexSearcher(reader);
Analyzer analyzer = new
Lucene.Net.Analysis.Standard.StandardAnalyzer();
MultiFieldQueryParser parser = new MultiFieldQueryParser(new
string[] { "CONTENT" }, analyzer);
Query query = parser.Parse("indicating");
query = query.Rewrite(reader);
Trace.WriteLine("Searching for: " + query.ToString());
Lucene.Net.Search.Hits hits = searcher.Search(query);
SimpleHTMLFormatter formatter = new SimpleHTMLFormatter("<b
class='term'>", "</b>");
QueryScorer scorer = new QueryScorer(query);
Highlighter highlighter = new Highlighter(formatter, scorer);
highlighter.SetTextFragmenter(new SimpleFragmenter(2000));
for (int i = 0; i < hits.Length(); i++)
{
Document resdoc = hits.Doc(i);
string s = resdoc.Get("CONTENT");
// s is null if Field.Store is NO
TokenStream tsTitle = analyzer.TokenStream("CONTENT", new
System.IO.StringReader(s));
string hl = highlighter.GetBestFragment(tsTitle, s);
}
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The problem is when the content is not stored in the index
(Field.Store.NO), the result document does not contain the value. Is
it possible to use the
Highlighter class in this case ? or what's the best way to highlight the
search result? is it possible to get all tokens for the hits.Doc(i)?
