full-text-search - 如何在 LuceneNet 中使用 indexWriter 删除文档

Question

我在我的 Controller 中调用了这个方法，它必须删除一个特定的文档。我在一些文章中读到删除文档的最佳方法是使用 IndexWriter。但我不能让它工作。这是我的代码

我的指数:

    var article1 = new Document();
               article1.Add(new Field("Id", "1", Field.Store.YES, Field.Index.ANALYZED));
               article1.Add(new Field("Author", "Author", Field.Store.YES, Field.Index.ANALYZED));
               article1.Add(new Field("Title", "Title", Field.Store.YES, Field.Index.ANALYZED));

  var directory = FSDirectory.Open(new DirectoryInfo(IndexRoute));
           var analyzar = new StandardAnalyzer(Version.LUCENE_29);

           var writer = new IndexWriter(directory, analyzar, true,  IndexWriter.MaxFieldLength.LIMITED);

           writer.AddDocument(article1);
           writer.Optimize();
           writer.Commit();
           writer.Close();

删除方法:

public void Delete(string id)
{
    var directory = FSDirectory.Open(new DirectoryInfo(IndexRoute));
    var analyzar = new StandardAnalyzer(Version.LUCENE_29);
    var writer = new IndexWriter(directory, analyzar, true, IndexWriter.MaxFieldLength.LIMITED);
    var term = new Term("Id", id);
    writer.DeleteDocuments(term);
    writer.Optimize();
    writer.Commit();
    writer.Close();
}

Controller 中调用“删除”无效的方法:

  public ActionResult Delete()
    {
        _carService.Delete("1");
        return RedirectToAction("Index", "Home");
    }

所以我找不到我的错误，请帮忙...

Answer 1

当您为这样的删除方法构建 IndexWriter 时:

new IndexWriter(directory, analyzar, true, IndexWriter.MaxFieldLength.LIMITED);

您正在为 create 参数指定 true ，它会用空索引覆盖现有索引，删除所有文档。