private static string getFromBaidu()
        {
            string resultJson = HttpWebRequestHelper.GetBaiduAcesessToken(
                BaiduAipHelper.BaiduTokenUrl,
                ConfigurationHelper.GetConfig(ConfigItemName.baiduApiKey.ToString()),
                ConfigurationHelper.GetConfig(ConfigItemName.baiduApiSecretKey.ToString())
                );
            string replaceJson = StringHelper.jsonCamelCaseToDBnameing(resultJson);

            mToken         = JsonHelper.JsonToObject(replaceJson, typeof(BDAccessToken)) as BDAccessToken;
            mToken.getDate = DateTimeHelper.getCurrentDateTime();
            if (mToken.error != null)
            {
                return(null);
            }
            else
            {
                writeToxml();
                return(mToken.accessToken);
            }
        }
 private static string getFromXml()
 {
     try
     {
         if (MyHelper.FileHelper.FolderExistsCreater(tokenFilePath))
         {
             if (!FileHelper.Exists(tokenXmlFilePath))
             {
                 FileHelper.CreateFile(tokenXmlFilePath);
                 return(null);
             }
             string tokenstr = FileHelper.Reader(tokenXmlFilePath);
             if (!string.IsNullOrEmpty(tokenstr))
             {
                 mToken = XmlHelper.Deserialize(typeof(BDAccessToken), tokenstr) as BDAccessToken;
                 if (mToken != null)
                 {
                     return(mToken.accessToken);
                 }
                 else
                 {
                     return(null);
                 }
             }
             else
             {
                 return(null);
             }
         }
         else
         {
             return(null);
         }
     }
     catch (Exception)
     {
         return(null);
     }
 }