C# 获取微信小程序access_token

 /// <summary>
 /// 获取access_token
 /// </summary>
 /// <returns></returns>
 public static string GetAccessToken()
 {
     string token = string.Empty;
     try
     {
         # 微信小程序接口
         string wechatapi = ConfigurationManager.AppSettings["wechatapi"].ToString();
         string appID = ConfigurationManager.AppSettings["AppID"].ToString();
         string appSecret = ConfigurationManager.AppSettings["AppSecret"].ToString();
         //获取微信token
         string token_url = "cgi-bin/token?grant_type=client_credential&appid=" + appID + "&secret=" + appSecret;

         var operateResult = LzWebAPICaller.Get<obxxxxject>(wechatapi token_url).ToString();
         HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(token_url);
         //请求方式
         myRequest.Method = "GET";
         HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
         StreamReader reader = new StreamReader(myResponse.GetResponseStream() Encoding.UTF8);
         string content = reader.ReadToEnd();
         myResponse.Close();
         reader.Dispose();
         javascriptSerializer serializer = new javascriptSerializer();
         token = serializer.Deserialize<string>(content);

     }
     catch (Exception ex)
     {
         token = "";
         ExceptionPolicy.HandleException(ex LZExceptionType.System
           "获取token失败!源:Lz.Product.LJXQJGF.BLL.Resident.ResidentLogic.GetAccessToken方法出错 ");
     }
     return token;
 }