Lucene.net只包含最後添加的文檔

Question

這是一個奇怪的問題，但每次向Lucene.net添加新文檔時，它都會覆蓋最後一個文檔，因此它始終保存最後插入的文檔。我已經使用LUKE證實了這種行爲，它可以讓我打開索引文件。如果有人能夠解決這個問題，我將不勝感激。這裏是我的代碼：

public class SearchService : ISearchService 
{ 
    Directory indexFileLocation; 
    Analyzer analyzer; 

    public SearchService(String indexLocation) 
    { 
     indexFileLocation = FSDirectory.GetDirectory(indexLocation, true); 
     analyzer = new StandardAnalyzer(); 
    } 

    public void AddToSearchIndex(ISearchableData data) 
    { 
     IndexWriter indexWriter = new IndexWriter(indexFileLocation, analyzer, true); 
     Document doc   = new Document(); 

     foreach (var entry in data) 
     { 
      Field field = new Field(
       entry.Key, 
       entry.Value, 
       Lucene.Net.Documents.Field.Store.NO, 
       Lucene.Net.Documents.Field.Index.TOKENIZED, 
       Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS); 

      doc.Add(field); 
     } 

     Field keyField = new Field(
      SearchField.Key.ToString(), 
      data.Key, 
      Lucene.Net.Documents.Field.Store.YES, 
      Lucene.Net.Documents.Field.Index.UN_TOKENIZED); 

     doc  .Add(keyField); 
     indexWriter.AddDocument(doc); 
     indexWriter.Optimize(); 
     indexWriter.Close(); 
    } 

    public IDictionary<Int32, float> SearchContent(String term) 
    { 
     IndexSearcher searcher = new IndexSearcher(indexFileLocation); 
     TermQuery  query = new TermQuery(new Term(SearchField.Content.ToString(), term)); 
     Hits   hits = searcher.Search(query); 
     searcher.Close(); 

     return OrganizeSearchResults(hits); 
    } 

    public IDictionary<Int32, float> OrganizeSearchResults(Hits hits) 
    { 
     IDictionary<Int32, float> result = new Dictionary<Int32, float>(); 
     String keyField = SearchField.Key.ToString(); 

     for (int i = 0; i < hits.Length(); i++) 
     { 
      Document doc = hits.Doc(i); 
      Field field = doc.GetField(keyField); 
      result.Add(Int32.Parse(
       field.StringValue()), 
       hits.Score(i)); 
     } 

     return result; 
    } 
} 

我添加的文件是這樣的：

new SearchService(searchIndexFolderPath).AddToSearchIndex(entry.ToSearchableData()); 

和搜索這樣的：

ISearchService search = new SearchService(MvcApplication.SearchIndexPath); 
IList<Int32> submissionIds = search.SearchContent(SearchTerm).Select(hit => hit.Key).ToList<Int32>(); 

Answer 1

的true這裏：

new IndexWriter(indexFileLocation, analyzer, true); 

告訴Lucene創建一個新的索引，刪除舊的索引。