http://www.liveq.net/?p=142 詳細使用技術
1.首先得把Lucene.Net.dll這個添加引用;
2.Highlighter.Net.dll 可選,用於查詢字體高亮度顯示;
/// 建立索引
public void CreateIndex()
{
string indexPath = Server.MapPath("index");//定義索引文件存放路徑
IndexWriter writer = new IndexWriter(indexPath, new StandardAnalyzer(), true);
//第一個參數是路徑
//第二個是索引分詞器,不同的分詞器代表不同的存放方式,目前分詞仍沒有達到100%標準
//第三個參數是是否覆蓋已存在的索引(不覆蓋即以追加的形式寫入文件)
DataTable dt = dal.GetList(""); // 從數據庫查詢集合列表,然後循環添加到Document文檔中去
for (int i = 0; i < dt.Rows.Count; i++)
{
Document doc = new Document();//初始化索引文檔,就像一張白紙
doc.Add(new Field("CompanyName", dt.Rows[i]["CompanyName"].ToString(), Field.Store.YES, Field.Index.TOKENIZED));
doc.Add(new Field("Comid", dt.Rows[i]["Comid"].ToString(), Field.Store.YES, Field.Index.UN_TOKENIZED));
//向白紙寫入鍵值對,索引是以哈希算法(依我理解)對文件的鍵值對進行搜索
//Field.Store.YES對索引字段進行存儲,也就是返回的結果有該字段,相反Field.Store.NO就是不存儲
//Field.Index.TOKENIZED,對該字段進行分詞處理,類似TSQL的like %% ,UN_TOKENIZED就是不分詞,全詞匹配
writer.AddDocument(doc);//將設計好的白紙文件放進索引文件裏
}
writer.Optimize();//優化索引
writer.Close();
}
// 綁定顯示值
private void bidn()
{
// 分頁
int pageSize = 12 ; // 每頁顯示多少條數據
int currentPage = 1; // 動態獲取每點擊下頁的索引currentpageIndex
string indexPath = Server.MapPath("index");//定義索引文件存放路徑
string keyword = this.txtserach.Text; // 搜索傳入的條件
if (keyword != "")
{
IndexSearcher searcher = new IndexSearcher(indexPath);
Analyzer analyzer = new StandardAnalyzer();
QueryParser query = new QueryParser("CompanyName", analyzer);
Query query1 = query.Parse(keyword);
BooleanQuery boolQuery = new BooleanQuery();
// 高亮度顯示
Highlighter highlighter = new Highlighter(new SimpleHTMLFormatter("<font color=\"red\">", "</font>"), new QueryScorer(query1));//使用高亮關鍵字顯示替代關鍵字
highlighter.SetTextFragmenter(new SimpleFragmenter(100));
DateTime time = DateTime.Now;
Hits hits = searcher.Search(query1);
DateTime end = DateTime.Now;
long ltime = end.Millisecond - time.Millisecond;
this.txtcontents.Text = "<font size=2 >關於 <b><font color=blue>" + keyword + "</font><b/> 共搜索到<b><font color=red>" + hits.Length() + "</font></b>個相關結果.搜索耗時:<font color=red>" + ltime + "</font>毫秒.</font></br>";
if (hits != null)
{
int start = pageSize * (currentPage - 1); int end = currentPage * pageSize; end = hits.Length()< end ? hits.Length(): end;
DataTable mytab = new DataTable();
mytab.Columns.Add("Comid");
mytab.Columns.Add("CompanyName");
mytab.Clear();
// 添加需要顯示的列表字段
for (int i = start; i < end ; i++) // 不分頁情況下for(int i=0;i<hits.length();i++)
{
Document doc = hits.Doc(i);
DataRow dr = mytab.NewRow();
dr[0] = doc.Get("Comid").ToString();
dr[1] = doc.Get("CompanyName").ToString();
mytab.Rows.Add(dr);
}
PagedDataSource pds = new PagedDataSource();
pds.DataSource = mytab.DefaultView;
this.AspNetPager1.RecordCount = pds.Count;
pds.AllowPaging = true;
pds.CurrentPageIndex = this.AspNetPager1.CurrentPageIndex - 1;
pds.PageSize = 20;
this.rtshort.DataSource = pds;
this.rtshort.DataBind();
}
}
----- 第二種方法就是返回所有結果列表PagedDataSource 分頁
PagedDataSource pds = new PagedDataSource();
pds.DataSource = dtSearch.DefaultView;
this.anpcurrent.RecordCount = pds.Count;
pds.AllowPaging = true;
pds.PageSize = this.anpcurrent.PageSize;
pds.CurrentPageIndex = this.anpcurrent.CurrentPageIndex - 1;
rtproduct.DataSource = pds;