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‎LuceneSearchExample.Services.Models/BuildIndex.cs

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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace LuceneSearchExample.Services.Models
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{
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public class BuildIndexRequest
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{
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public IEnumerable<User> Users;
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}
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}

‎LuceneSearchExample.Services.Models/LuceneSearchExample.Services.Models.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>netcoreapp2.0</TargetFramework>
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</PropertyGroup>
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</Project>

‎LuceneSearchExample.Services.Models/Search.cs

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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace LuceneSearchExample.Services.Models
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{
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public class SearchRequest
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{
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public string Query { get; set; }
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}
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public class SearchResponse
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{
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public SearchResponse() => Users = new List<User>();
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public int TotalCount{ get; set; }
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public IList<User> Users { get; set; }
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}
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}

‎LuceneSearchExample.Services.Models/User.cs

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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace LuceneSearchExample.Services.Models
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{
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public class User
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{
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public int UserId { get; set; }
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public string FirstName { get; set; }
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public string LastName { get; set; }
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public int Age { get; set; }
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}
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}

‎LuceneSearchExample.Services/Abstract/ISearchService.cs

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using LuceneSearchExample.Services.Concrete;
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using LuceneSearchExample.Services.Models;
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace LuceneSearchExample.Services.Abstract
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{
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public interface ISearchService
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{
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void BuildIndex(BuildIndexRequest request);
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SearchResponse Search(SearchRequest request);
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}
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}

‎LuceneSearchExample.Services/Concrete/Index.cs

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using Lucene.Net.Analysis;
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using Lucene.Net.Analysis.Core;
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using Lucene.Net.Analysis.Miscellaneous;
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using Lucene.Net.Analysis.Standard;
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using Lucene.Net.Documents;
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using Lucene.Net.Index;
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using Lucene.Net.QueryParsers.Classic;
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using Lucene.Net.Search;
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using Lucene.Net.Store;
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using Lucene.Net.Util;
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using LuceneSearchExample.Services.Models;
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using System;
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using System.Collections.Generic;
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namespace LuceneSearchExample.Services.Concrete
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{
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internal class Index : IDisposable
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{
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private const LuceneVersion MATCH_LUCENE_VERSION = LuceneVersion.LUCENE_48;
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private const int SNIPPET_LENGTH = 100;
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private readonly IndexWriter writer;
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private readonly Analyzer analyzer;
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private readonly QueryParser queryParser;
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private readonly SearcherManager searchManager;
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public Index(string indexPath)
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{
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analyzer = SetupAnalyzer();
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queryParser = SetupQueryParser(analyzer);
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writer = new IndexWriter(FSDirectory.Open(indexPath), new IndexWriterConfig(MATCH_LUCENE_VERSION, analyzer));
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searchManager = new SearcherManager(writer, true, null);
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}
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private Analyzer SetupAnalyzer()
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{
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return Analyzer.NewAnonymous((field, reader) =>
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{
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var tokenizer = new StandardTokenizer(MATCH_LUCENE_VERSION, reader);
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TokenStream tokenStream = new StandardFilter(MATCH_LUCENE_VERSION, tokenizer);
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tokenStream = new ASCIIFoldingFilter(tokenStream);
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tokenStream = new LowerCaseFilter(MATCH_LUCENE_VERSION, tokenStream);
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tokenStream = new StopFilter(MATCH_LUCENE_VERSION, tokenStream, StopAnalyzer.ENGLISH_STOP_WORDS_SET);
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return new TokenStreamComponents(tokenizer, tokenStream);
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});
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}
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private QueryParser SetupQueryParser(Analyzer analyzer)
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{
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return new MultiFieldQueryParser(
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MATCH_LUCENE_VERSION,
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new[] { "firstname", "lastname", "age" },
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analyzer
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);
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}
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public void Build(IEnumerable<User> users)
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{
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if (users == null)
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{
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throw new ArgumentNullException();
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}
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foreach (var user in users)
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{
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writer.UpdateDocument(new Term("id", user.UserId.ToString()), BuildDocument(user));
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}
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writer.Flush(true, true);
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writer.Commit();
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}
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private Document BuildDocument(User user)
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{
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Document doc = new Document
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{
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new StoredField("userid", user.UserId),
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new TextField("firstname", user.FirstName, Field.Store.YES),
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new TextField("lastname", user.LastName, Field.Store.YES),
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new StringField("age", user.Age.ToString(), Field.Store.YES)
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};
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return doc;
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}
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public SearchResponse Search(string queryString)
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{
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int resultsPerPage = 10;
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Query query = BuildQuery(queryString);
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searchManager.MaybeRefreshBlocking();
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IndexSearcher searcher = searchManager.Acquire();
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try
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{
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TopDocs topdDocs = searcher.Search(query, resultsPerPage);
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return CompileResults(searcher, topdDocs);
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}
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finally
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{
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searchManager.Release(searcher);
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searcher = null;
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}
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}
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private SearchResponse CompileResults(IndexSearcher searcher, TopDocs topdDocs)
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{
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var searchResults = new SearchResponse() { TotalCount = topdDocs.TotalHits };
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foreach (var result in topdDocs.ScoreDocs)
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{
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var document = searcher.Doc(result.Doc);
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var searchResult = new User
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{
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Age = Convert.ToInt32(document.GetField("age")?.GetStringValue()),
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FirstName = document.GetField("firstname")?.GetStringValue(),
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UserId = Convert.ToInt32(document.GetField("userid")?.GetStringValue()),
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LastName = document.GetField("lastname")?.GetStringValue()
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};
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searchResults.Users.Add(searchResult);
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}
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return searchResults;
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}
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private Query BuildQuery(string queryString)
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{
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return queryParser.Parse(Sanitize(queryString));
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}
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private string Sanitize(string queryString)
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{
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string[] removed = { "*", "?", "%", "+" };
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string[] spaces = { "-" };
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foreach (var r in removed)
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{
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queryString = queryString.Replace(r, string.Empty);
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}
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foreach (var s in spaces)
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{
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queryString = queryString.Replace(s, " ");
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}
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return queryString;
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}
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public void Dispose()
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{
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searchManager?.Dispose();
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analyzer?.Dispose();
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writer?.Dispose();
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}
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}
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}

‎LuceneSearchExample.Services/Concrete/SearchService.cs

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using LuceneSearchExample.Services.Abstract;
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using LuceneSearchExample.Services.Models;
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace LuceneSearchExample.Services.Concrete
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{
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public class SearchService : ISearchService
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{
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private readonly Index index;
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public SearchService(string indexDirectory)
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{
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index = new Index(indexDirectory);
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}
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public void BuildIndex(BuildIndexRequest request)
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{
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index.Build(request.Users);
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}
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public SearchResponse Search(SearchRequest request) => index.Search(request.Query);
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}
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}

‎LuceneSearchExample.Services/LuceneSearchExample.Services.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>netcoreapp2.0</TargetFramework>
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</PropertyGroup>
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<ItemGroup>
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<Folder Include="Abstract\" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="Lucene.Net" Version="4.8.0-beta00004" />
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<PackageReference Include="Lucene.Net.QueryParser" Version="4.8.0-beta00004" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\LuceneSearchExample.Services.Models\LuceneSearchExample.Services.Models.csproj" />
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</ItemGroup>
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</Project>

‎LuceneSearchExample.sln

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio 15
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VisualStudioVersion = 15.0.26730.12
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LuceneSearchExample", "LuceneSearchExample\LuceneSearchExample.csproj", "{A15F3E42-9E93-4849-A013-252809D94439}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LuceneSearchExample.Services", "LuceneSearchExample.Services\LuceneSearchExample.Services.csproj", "{F477A264-92A5-46AC-AB9E-C7A97B9B645A}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LuceneSearchExample.Services.Models", "LuceneSearchExample.Services.Models\LuceneSearchExample.Services.Models.csproj", "{FDFCC9F4-B2C8-4C7E-A8DA-DD9ECE0D326C}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{A15F3E42-9E93-4849-A013-252809D94439}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{A15F3E42-9E93-4849-A013-252809D94439}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{A15F3E42-9E93-4849-A013-252809D94439}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{A15F3E42-9E93-4849-A013-252809D94439}.Release|Any CPU.Build.0 = Release|Any CPU
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{F477A264-92A5-46AC-AB9E-C7A97B9B645A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{F477A264-92A5-46AC-AB9E-C7A97B9B645A}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{F477A264-92A5-46AC-AB9E-C7A97B9B645A}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{F477A264-92A5-46AC-AB9E-C7A97B9B645A}.Release|Any CPU.Build.0 = Release|Any CPU
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{FDFCC9F4-B2C8-4C7E-A8DA-DD9ECE0D326C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{FDFCC9F4-B2C8-4C7E-A8DA-DD9ECE0D326C}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{FDFCC9F4-B2C8-4C7E-A8DA-DD9ECE0D326C}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{FDFCC9F4-B2C8-4C7E-A8DA-DD9ECE0D326C}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {BEC39F92-05D6-42EF-9A6A-54E074A9D688}
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EndGlobalSection
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EndGlobal

‎LuceneSearchExample/LuceneSearchExample.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>netcoreapp2.0</TargetFramework>
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</PropertyGroup>
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<ItemGroup>
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<ProjectReference Include="..\LuceneSearchExample.Services\LuceneSearchExample.Services.csproj" />
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</ItemGroup>
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</Project>

‎LuceneSearchExample/Program.cs

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using LuceneSearchExample.Services.Concrete;
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using LuceneSearchExample.Services.Models;
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using System;
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using System.Collections.Generic;
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namespace LuceneSearchExample
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{
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class Program
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{
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static void Main(string[] args)
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{
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var searchService = new SearchService(@"D:\index");
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searchService.BuildIndex(new BuildIndexRequest()
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{
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Users = new List<User>()
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{
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new User { UserId =1 , Age = 27 , FirstName = "Dani", LastName = "Daniels" },
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new User { UserId =1 , Age = 29 , FirstName = "Sasha", LastName = "Grey" },
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new User { UserId =1 , Age = 31 , FirstName = "Nicole", LastName = "Aniston" },
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new User { UserId =1 , Age = 28 , FirstName = "Tori", LastName = "Black" },
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}
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});
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var searchRequest = new SearchRequest()
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{
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Query = "Daniels"
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};
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var searchResponse = searchService.Search(searchRequest);
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foreach (var item in searchResponse.Users)
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{
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Console.WriteLine($"{item.UserId} - {item.FirstName} - {item.LastName} - {item.Age}");
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}
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Console.ReadLine();
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}
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}
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}

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