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| <p class="text-center">Lucene.Net is a high performance search engine library for .NET</p> |
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| Install-Package Lucene.Net -Pre |
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| <p class="text-center">Create an index and define a text analyzer</p> |
| <pre class="clean"> |
| <code class="csharp">// Ensures index backwards compatibility |
| var AppLuceneVersion = LuceneVersion.LUCENE_48; |
| |
| var indexLocation = @"C:\Index"; |
| var dir = FSDirectory.Open(indexLocation); |
| |
| //create an analyzer to process the text |
| var analyzer = new StandardAnalyzer(AppLuceneVersion); |
| |
| //create an index writer |
| var indexConfig = new IndexWriterConfig(AppLuceneVersion, analyzer); |
| var writer = new IndexWriter(dir, indexConfig); |
| </code> |
| </pre> |
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| <p class="text-center">Add to the index</p> |
| <pre class="clean"> |
| <code class="csharp">var source = new |
| { |
| Name = "Kermit the Frog", |
| FavouritePhrase = "The quick brown fox jumps over the lazy dog" |
| }; |
| var doc = new Document(); |
| // StringField indexes but doesn't tokenise |
| doc.Add(new StringField("name", source.Name, Field.Store.YES)); |
| |
| doc.Add(new TextField("favouritePhrase", source.FavouritePhrase, Field.Store.YES)); |
| |
| writer.AddDocument(doc); |
| writer.Flush(triggerMerge: false, applyAllDeletes: false); |
| </code> |
| </pre></div> |
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| <p class="text-center">Construct a query</p> |
| <pre class="clean"> |
| <code class="csharp">// search with a phrase |
| var phrase = new MultiPhraseQuery(); |
| phrase.Add(new Term("favouritePhrase", "brown")); |
| phrase.Add(new Term("favouritePhrase", "fox")); |
| </code> |
| </pre> |
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| <p class="text-center">Fetch the results</p> |
| <pre class="clean"> |
| <code class="csharp">// re-use the writer to get real-time updates |
| var searcher = new IndexSearcher(writer.GetReader(applyAllDeletes: true)); |
| var hits = searcher.Search(phrase, 20 /* top 20 */).ScoreDocs; |
| foreach (var hit in hits) |
| { |
| var foundDoc = searcher.Doc(hit.Doc); |
| hit.Score.Dump("Score"); |
| foundDoc.Get("name").Dump("Name"); |
| foundDoc.Get("favouritePhrase").Dump("Favourite Phrase"); |
| } |
| </code> |
| </pre> |
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| |
| <h2 id="about" class="text-center">About the project</h2> |
| <p>Lucene.Net is a port of the Lucene search engine library, written in C# and targeted at .NET runtime users</p> |
| <h3 id="our-goals">Our Goals</h3> |
| <ul> |
| <li>Maintain the existing line-by-line port from Java to C#, fully automating and commoditizing the process such that the project can easily synchronize with the Java Lucene release schedule</li> |
| <li>Maintaining the high-performance requirements expected of a first class C# search engine library</li> |
| <li>Maximize usability and power when used within the .NET runtime. To that end, it will present a highly idiomatic, carefully tailored API that takes advantage of many of the special features of the .NET runtime</li> |
| </ul> |
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