Lucene.net 实现全文搜索

Lucene.net 实现全文搜索(3)             for(int i=0;i<pattern .Length ;i++)
            {
                foreach (FileInfo fi in directory.GetFiles(pattern[i]))
                {
                    AddHtmlDocument(fi.FullName);
                }
            }
            foreach (DirectoryInfo di in directory.GetDirectories())
            {
                addSubDirectory(di);
            }
        }
       
        public void AddHtmlDocument(string path)
        {
            string exname=Path.GetExtension (path);
            Document doc = new Document();   
       
            string html;           
            if(exname.ToLower ()==".html" exname .ToLower ()==".htm"exname .ToLower ()==".txt")
            {