//刷新accesstoken
public static string RefrenshToken(string appid, string appsecret)
{
string userAgent = System.Web.HttpContext.Current.Request.UserAgent;
string url = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", appid, appsecret);
HttpWebResponse res = WechatHttpWebResponseUtility.CreateGetHttpResponse(url, null, userAgent, null);
Stream stream = res.GetResponseStream();
StreamReader sr = new StreamReader(stream);
string result = sr.ReadToEnd();
WechatAccessToken token = new WechatAccessToken();
token = JsonConvert.DeserializeObject <WechatAccessToken>(result);
string access_token = token.access_token;
if (string.IsNullOrEmpty(token.access_token))
{
WechatError err = new WechatError();
err = JsonConvert.DeserializeObject <WechatError>(result);
access_token = "appid或者appsecret错误，无法获取access_token 微信错误代码：" + err.errcode + "微信错误信息：" + err.errmsg;
WechatLogHelper.Error(access_token);
}
else
{
ConfigService.WriteKey("WechatAccessToken", access_token);
ConfigService.WriteKey("WechatAccessTokenExpiredTime", System.DateTime.Now.AddMinutes(115).ToString("yyyy-MM-dd HH:mm:ss"));
}
return(access_token);
}
/// <summary>
/// Get Wechat Access Token. The token expires in 7200 seconds. If the call fails, throw InvalidOperationException.
/// </summary>
/// <returns>Access Token object</returns>
public static WechatAccessToken GetAccessToken()
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(string.Format(GetAccessTokenUrlTemplate, AppId, AppSecret));
request.Method = "GET";
request.ContentType = "content-type: text/html; charset=utf-8";
HttpWebResponse res = (HttpWebResponse)request.GetResponse();
Stream resStream = res.GetResponseStream();
DataContractJsonSerializer serAccessToken = new DataContractJsonSerializer(typeof(WechatAccessToken));
WechatAccessToken token = (WechatAccessToken)serAccessToken.ReadObject(resStream);
if (token == null || token.AccessTokenData == null)
{
DataContractJsonSerializer serError = new DataContractJsonSerializer(typeof(Error));
Error error = (Error)serError.ReadObject(resStream);
throw new InvalidOperationException(string.Format("Error: {0}|{1}", error.ErrorCode, error.ErrorMessage));
}
else
{
return(token);
}
}
/// <summary>
/// Cache Access Token to wechat database
/// </summary>
/// <param name="token">Access Token to be saved</param>
internal static void SaveAccessTokenToDatabaseCache(WechatAccessToken token)
{
using (WechatDBDataContext database = new WechatDBDataContext())
{
AccessToken accessTokenEntity = new AccessToken();
accessTokenEntity.AccessTokenData = token.AccessTokenData;
accessTokenEntity.ExpireBy = DateTime.UtcNow.AddSeconds(AccessTokenSafeExpire);
database.AccessTokens.InsertOnSubmit(accessTokenEntity);
database.SubmitChanges();
}
}
