Lucene.Net2.0搜索结果排序问题

//以下代码基于Incubating-Apache-Lucene.Net-2.0-004-11Mar07

Hits hits = searcher.Search(query, new Sort(new SortField(null, SortField.DOC, true)));

参考：
http://markmail.org/message/noq4kohwipx5wzfo#query:Sort.INDEXORDER+page:1+mid:4ydkfgdj6kbvhq2x+state:results

In Cnblog.com:
http://www.cnblogs.com/zhubo/archive/2008/02/25/Lucene_Net_Sort.html