无法抓住异常

Question

长期运行Web请求，处理来自服务器的数据，在线程中运行。 当网络电缆断开时，代码'oRe = bFmt.Deserialize（s）;'无处可去。 我猜必须抛出异常，但无法捕获它。 如何捕获异常并处理它？<​​/ p>

 System.Net.HttpWebResponse response = null;
 string url = "http://serverurl:port/Message/AsnyHandler.ashx?id=01020102011";
 System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)WebRequest.Create(url);
 request.Method = "GET";
 request.Timeout = 1200000;
 request.ReadWriteTimeout = 1200000;
 request.ContentType = "application/x-www-form-urlencoded";
 request.KeepAlive = false;

 response = (System.Net.HttpWebResponse)request.GetResponse();

 System.IO.Stream s = null;
 object oRe = null;

try
{

     while (true)
     {

          s = response.GetResponseStream();

          if (s.CanRead)
          {

                BinaryFormatter bFmt = new BinaryFormatter();
              oRe = bFmt.Deserialize(s);

                if (oRe != null)
                {
                    this.BeginInvoke(new DelegateProcessMsg(this.ProcessMsg), new object[1] { oRe }); 
                    oRe = null;
                }
           }
      }
}
catch (IOException ex)
{
    s.Close();
    response.Close();
}
catch(Exception ex)
{
    response.Close();
}