C#从新浪新闻上提取新闻标题

static void Main(string[] args)       {           Stopwatch watch = new Stopwatch();           watch.Start();           WebClient wc = new WebClient();           int count = 0;           //正则表达式           string regLinks = "<li><a\\s+href=\"http://mil.news.sina.com.cn/20\\d{2}-\\d{2}-\\d{2}/\\d{10}\\.html\"\\s+target=\"_blank\">(.+?)</a><span\\s+class=\"time\">(.+?)</span></li>";           //由于耗时太久，在这里我只提取新浪100个页面的新闻标题           for (int i = 1; i < 100; i++)           {               //http://roll.mil.news.sina.com.cn/col/zgjq/index_4.shtml               string url = @"http://roll.mil.news.sina.com.cn/col/zgjq/index_"+i+".shtml";                string html = wc.DownloadString(url);               MatchCollection matchs = Regex.Matches(html, regLinks);               using (StreamWriter sw = new StreamWriter(@"c:\news.txt", true, Encoding.GetEncoding("gb2312")))               {                   foreach (Match match in matchs)                   {                       if (match.Success)                       {                           sw.WriteLine(match.Groups[1].Value + "\t" + match.Groups[2].Value);                           count++;                       }                   }               }           }           watch.Stop();           Console.WriteLine("共提取了{0}个新闻标题",count);           Console.WriteLine("共计用时：{0}",watch.Elapsed);           Console.ReadKey();       }