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Krzysztof Guzenda answered on August 26, 2021 Popularity 9/10 Helpfulness 2/10

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example of using lucene with .net c#

using Lucene.Net.Analysis;
using Lucene.Net.Analysis.Standard;
using Lucene.Net.Documents;
using Lucene.Net.Index;
using Lucene.Net.Search;
using Lucene.Net.Store;
using Lucene.Net.Util;
using System.Diagnostics;
using LuceneDirectory = Lucene.Net.Store.Directory;

// Specify the compatibility version we want
const LuceneVersion luceneVersion = LuceneVersion.LUCENE_48; 

//Open the Directory using a Lucene Directory class
string indexName = "example_index";
string indexPath = Path.Combine(Environment.CurrentDirectory, indexName);

using LuceneDirectory indexDir = FSDirectory.Open(indexPath);

//Create an analyzer to process the text 
Analyzer standardAnalyzer = new StandardAnalyzer(luceneVersion);

//Create an index writer
IndexWriterConfig indexConfig = new IndexWriterConfig(luceneVersion, standardAnalyzer);
indexConfig.OpenMode = OpenMode.CREATE;                             // create/overwrite index
IndexWriter writer = new IndexWriter(indexDir, indexConfig);

//Add three documents to the index
Document doc = new Document();
doc.Add(new TextField("titleTag", "The Apache Software Foundation - The world's largest open source foundation.", Field.Store.YES));
doc.Add(new StringField("domain", "www.apache.org/", Field.Store.YES));
writer.AddDocument(doc);

doc = new Document();
doc.Add(new TextField("title", "Powerful open source search library for .NET", Field.Store.YES));
doc.Add(new StringField("domain", "lucenenet.apache.org", Field.Store.YES));
writer.AddDocument(doc);

doc = new Document();
doc.Add(new TextField("title", "Unique gifts made by small businesses in North Carolina.", Field.Store.YES));
doc.Add(new StringField("domain", "www.giftoasis.com", Field.Store.YES));
writer.AddDocument(doc);

//Flush and commit the index data to the directory
writer.Commit();

using DirectoryReader reader = writer.GetReader(applyAllDeletes: true);
IndexSearcher searcher = new IndexSearcher(reader);

Query query = new TermQuery(new Term("domain", "lucenenet.apache.org"));
TopDocs topDocs = searcher.Search(query, n: 2);         //indicate we want the first 2 results


int numMatchingDocs = topDocs.TotalHits;
Document resultDoc = searcher.Doc(topDocs.ScoreDocs[0].Doc);  //read back first doc from results (ie 0 offset)
string title = resultDoc.Get("title");

Console.WriteLine($"Matching results: {topDocs.TotalHits}");
Console.WriteLine($"Title of first result: {title}");

Popularity 9/10 Helpfulness 2/10 Language csharp

Source: lucenenet.apache.org

Tags: c# lucene.net

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Contributed on Feb 11 2023

Krzysztof Guzenda

0 Answers Avg Quality 2/10

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// Search with a phrase
var phrase = new MultiPhraseQuery
{
    new Term("favoritePhrase", "brown"),
    new Term("favoritePhrase", "fox")
};

Popularity 9/10 Helpfulness 1/10 Language csharp

Source: lucenenet.apache.org

Tags: c# lucene.net luc

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Contributed on Aug 26 2021

Itchy Ibis

0 Answers Avg Quality 2/10

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