private string GetToken()   {     // 也可以這樣寫:     //return GetPage("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=你的appid&secret=你的secret", "");         string res = "";     HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=你的appid&secret=你的secret"); req.Method = "GET";     using (WebResponse wr = req.GetResponse())     {       HttpWebResponse myResponse = (HttpWebResponse)req.GetResponse();       StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);       string content = reader.ReadToEnd();         List<ACCESSTOKEN> myACCESSTOKEN = Json.JSONStringToList<ACCESSTOKEN>(content);       res = myACCESSTOKEN[0].access_token;      }     return res;   }   public string GetPage(string posturl, string postData)   {     Stream outstream = null;     Stream instream = null;     StreamReader sr = null;     HttpWebResponse response = null;     HttpWebRequest request = null;     Encoding encoding = Encoding.UTF8;     byte[] data = encoding.GetBytes(postData);     // 準備請求...     try     {       // 設置參數       request = WebRequest.Create(posturl) as HttpWebRequest;       CookieContainer cookieContainer = new CookieContainer();       request.CookieContainer = cookieContainer;       request.AllowAutoRedirect = true;       request.Method = "POST";       request.ContentType = "application/x-www-form-urlencoded";       request.ContentLength = data.Length;       outstream = request.GetRequestStream();       outstream.Write(data, 0, data.Length);       outstream.Close();       //發送請求并獲取相應回應數據       response = request.GetResponse() as HttpWebResponse;       //直到request.GetResponse()程序才開始向目標網頁發送Post請求       instream = response.GetResponseStream();       sr = new StreamReader(instream, encoding);       //返回結果網頁（html）代碼       string content = sr.ReadToEnd();       string err = string.Empty;       return content;     }     catch (Exception ex)     {       string err = ex.Message;       Response.Write(err);       return string.Empty;     }   }