.NET微信公众号开发之查询自定义菜单

 /// <summary> /// 微信许可令牌 /// </summary> public class AccessToken { /// <summary> /// 保存已获取到的许可令牌，键为公众号，值为公众号最后一次获取到的令牌 /// </summary> private static ConcurrentDictionary accessTokens = new ConcurrentDictionary(); /// <summary> /// 获取access token的地址 /// </summary> private const string urlForGettingAccessToken = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}"; /// <summary> /// 获取access token的http方法 /// </summary> private const string httpMethodForGettingAccessToken = WebRequestMethods.Http.Get; /// <summary> /// 保存access token的最长时间（单位：秒），超过时间之后，需要重新获取 /// </summary> private const int accessTokenSavingSeconds = 7000; /// <summary> /// access token /// </summary> public string access_token { get; set; } /// <summary> /// 有效时间，单位：秒 /// </summary> public int expires_in { get; set; } /// <summary> /// 构造函数 /// </summary> /// access token /// 有效时间 internal AccessToken(string _access_token, int _expires_in) { access_token = _access_token; expires_in = _expires_in; } /// <summary> /// 返回AccessToken字符串 /// </summary> ///  public override string ToString() { return string.Format("AccessToken：{0}\r\n有效时间：{1}秒", access_token, expires_in); } /// <summary> /// 从JSON字符串解析AccessToken /// </summary> /// JSON字符串 /// 返回AccessToken internal static AccessToken ParseFromJson(string json) { var at = JsonConvert.DeserializeAnonymousType(json, new { access_token = "", expires_in = 1 }); return new AccessToken(at.access_token, at.expires_in); } /// <summary> /// 尝试从JSON字符串解析AccessToken /// </summary> /// JSON字符串 /// 如果解析成功，返回AccessToken；否则，返回null。 /// 返回是否解析成功 internal static bool TryParseFromJson(string json, out AccessToken token) { bool success = false; token = null; try { token = ParseFromJson(json); success = true; } catch { } return success; } /// <summary> /// 得到access token /// </summary> /// 公众号 /// 返回access token public static AccessToken Get(string userName) { Tuple lastToken = accessTokens.ContainsKey(userName) ? accessTokens[userName] : null; AccessToken token = lastToken == null ? null : lastToken.Item1; DateTime refreshTime = lastToken == null ? DateTime.MinValue : lastToken.Item2; double ms = (DateTime.Now - refreshTime).TotalSeconds; if (ms > accessTokenSavingSeconds || token == null) { //尝试从微信服务器获取2次 ErrorMessage msg; AccessToken newToken = GetFromWeixinServer(userName, out msg); if (newToken == null) newToken = GetFromWeixinServer(userName, out msg); if (newToken != null) { lastToken = new Tuple(newToken, DateTime.Now); accessTokens[userName] = lastToken; token = newToken; } } return token; } /// <summary> /// 从微信服务器获取access token /// </summary> /// 公众号 /// 从服务器返回的错误信息。 /// 返回许可令牌；如果获取失败，返回null。 private static AccessToken GetFromWeixinServer(string userName, out ErrorMessage msg) { AccessToken token = null; msg = new ErrorMessage(ErrorMessage.ExceptionCode, ""); string url = string.Format(urlForGettingAccessToken, WxPayConfig.APPID, WxPayConfig.APPSECRET); string result; if(!HttpHe<mark style="color:transparent">来源gaodaimacom搞#代%码网</mark>lper.Request(url, out result, httpMethodForGettingAccessToken, string.Empty)) { msg.errmsg = "从微信服务器获取响应失败。"; return token; } if (ErrorMessage.IsErrorMessage(result)) msg = ErrorMessage.Parse(result); else { try { token = AccessToken.ParseFromJson(result); } catch (Exception e) { msg = new ErrorMessage(e); } } return token; } }