代码如下

  private void GetWeather()
  {
   HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://weather.news.qq.com/inc/dc189.htm");
   request.Method = "Get";
   request.ContentType = "application/x-www-form-urlencoded";
   WebResponse response = request.GetResponse();
   Stream s = response.GetResponseStream();
   StreamReader sr = new StreamReader(s,System.Text.Encoding.GetEncoding("GB2312"));
   string html = sr.ReadToEnd();
   s.Close();
   sr.Close();
   Response.Write(html.Replace("/images/","http://weather.news.qq.com/images/"));
  }

比较简单，没有做什么处理，只是替换了图片的地址。

呵呵，大家可以根据自己的需求再进行处理，达到自己想要的格式