public ActionResult Login()
        {
            /*
            * 3、获取用户认证地址。(参考Login.aspx文件)
            */
            var oauth = new GW.Weixin.OAuths.Weixinmps.WeixinmpOAuth();
            if (oauth != null)
            {
                oauth.UpdateCache(DateTime.Now.AddHours(1)); //缓存当前协议
                var token = oauth.GetAccessToken();
                if (token.ret == 0)
                {
                    oauth.AccessToken = token.access_token;
                    oauth.ExpiresIn = token.expires_in;
                    oauth.UpdateCache(); //缓存认证信息

                    //var paras = oauth.GetTokenParas();
                    //var json = oauth.ApiByHttpGet("users_show", paras);
                    //var user = UtilHelper.ParseJson<WeixinMUser>(oauth.ApiByHttpPost("user_info", paras));
                    
                    //ViewBag.WeixinUser= user;
                    //Response.Redirect("./");
                }
                else
                {
                   // Response.Write(token.msg + "(" + token.errcode + ")");
                   // Response.Write("<br />" + token.response);
                }
            }
            else
            {
                //Response.Write("登录失败,找不到相对应的接口");
            }
            return View();
        }
        /// <summary>
        /// 获取当前缓存OAuth
        /// </summary>
        /// <returns></returns>
        public static GW.Weixin.OAuths.Weixinmps.WeixinmpOAuth GetCurrentOAuth()
        {
            try
            {
                var oauth = new GW.Weixin.OAuths.Weixinmps.WeixinmpOAuth();
                if (oauth != null && oauth.HasCache)
                {
                    return oauth;
                }
                else
                {
                    throw new Exception("发送失败,找不到相对应的OAuth缓存或登陆超时");
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }