一般处理程序获得一个链接返回的值

一般处理程序获得一个链接返回的值：

   public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        string openid =  context .Request ["openid"].ToString();
      string num = GetFunction("http://wap.quantumfilm.com.cn/2016/Selec_Openid.aspx?Openid=" + openid);
        context.Response.Write(num);

    }

    //get
    public static string GetFunction(string url)
    {

        string serviceAddress = url;
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(serviceAddress);
        request.Method = "GET";
        request.ContentType = "text/html;charset=UTF-8";
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream myResponseStream = response.GetResponseStream();
        StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
        string retString = myStreamReader.ReadToEnd();
        myStreamReader.Close();
        myResponseStream.Close();
        return retString;
    }