Lucene.net - C#

Lucene.net is a high-performance, full-featured search engine library written in C# for .NET applications. It is a port of the popular Apache Lucene library originally written in Java. Lucene.net provides all the powerful indexing and search capabilities that you would expect from a search engine. It is widely used in both commercial and open source applications.

Features

• High-performance indexing and searching
• Supports multiple languages
• Supports text, numeric, date, and location-based search
• Optical Character Recognition (OCR) support
• Customizable scoring system
• Distributed searching
• Supports incremental indexing and batch updates

Getting Started

To use Lucene.net in your .NET application, you first need to install the NuGet package. You can do this via the NuGet Package Manager or by running the following command in the Package Manager Console:

PM> Install-Package Lucene.Net

Once you have installed the package, you can create an index and start searching. Here's a simple example:

using Lucene.Net.Analysis.Standard;
using Lucene.Net.Index;
using Lucene.Net.Search;
using Lucene.Net.Store;
using Lucene.Net.Documents;

var directory = new RAMDirectory();
var analyzer = new StandardAnalyzer(Lucene.Net.Util.LuceneVersion.LUCENE_48);
var indexConfig = new IndexWriterConfig(Lucene.Net.Util.LuceneVersion.LUCENE_48, analyzer);
var writer = new IndexWriter(directory, indexConfig);

var doc = new Document();
doc.Add(new TextField("title", "Hello World", Field.Store.YES));
doc.Add(new TextField("content", "Lucene.net is awesome!", Field.Store.YES));
writer.AddDocument(doc);

writer.Commit();

var searcher = new IndexSearcher(writer.GetReader(true));
var queryParser = new QueryParser(Lucene.Net.Util.LuceneVersion.LUCENE_48, "content", analyzer);
var query = queryParser.Parse("awesome");
var topDocs = searcher.Search(query, 10);

foreach (var scoreDoc in topDocs.ScoreDocs)
{
    var document = searcher.Doc(scoreDoc.Doc);
    Console.WriteLine($"{document.Get("title")}: {document.Get("content")}");
}

searcher.Dispose();
writer.Dispose();
directory.Dispose();

Conclusion

Lucene.net is an excellent tool for anyone looking to implement search functionality in their .NET applications. Its high-performance indexing and searching capabilities, along with its support for multiple languages and query types make it a powerful and flexible search engine. If you have not yet tried Lucene.net, now is the time to do so.