代码如下：

try
 {
     int totalFile = 0;
     //string dirPath = @"E:filesBSC6810 alarm";
     if (this.textBox1.Text.Trim() == "")
     {
         MessageBox.Show("请输入HTML文件路径！");
     }
     else
     {
         string dirPath = this.textBox1.Text.Trim();
         if (!dirPath.Substring(dirPath.Length - 1).Contains("\"))
         {
  dirPath = dirPath+"\";
         }
         StreamWriter sw;
         DirectoryInfo dirInfo = new DirectoryInfo(dirPath);
         FileInfo[] files = dirInfo.GetFiles();
         string filename = dirPath + "告警经验库信息.txt";
         if (File.Exists(filename))
         {
  sw = File.AppendText(filename);
         }
         else
         {
  sw = File.CreateText(filename);
         }
 
         foreach (FileInfo fileinfo in files)
         {
  if (fileinfo.Extension.Equals(".htm"))//遍历所有htm文件
  {
      totalFile = totalFile + 1;
      WebRequest myWebRequest = WebRequest.Create(dirPath + fileinfo.Name);
      WebResponse myWebResponse = myWebRequest.GetResponse();
      Stream myStream = myWebResponse.GetResponseStream();
      Encoding encode = System.Text.Encoding.GetEncoding("gb2312");
      StreamReader myStreamReader = new StreamReader(myStream, encode);
      string strhtml = myStreamReader.ReadToEnd();
      myWebResponse.Close();
      string stroutput = strhtml;
      Regex regex = new Regex(@"]+>|]+>");//去掉HTML标记的正则表达式
      string tmpStr = "([^