public async Task <string> GetWxAccessTokenAsync(string appId, string secret)
{
var key = KeyForOther($"Weixin:AccessToken:{appId}");
var now = DateTime.Now;
var ret = await Database.StringGetAsync(key);
JObject json = null;
if (!ret.IsNull)
{
json = JObject.Parse(ret);
if (json["expire_time"].Value <DateTime>() > now)
{
return(json["access_token"].Value <string>());
}
}
var token = await WeixinHelper.GetAccessTokenAsync(appId, secret);
json = JObject.Parse(token);
if (json["errcode"] != null && json["errcode"].Value <int>() > 0)
{
throw new Exception($"获取令牌错误，{json["errmsg"].Value<string>()}");
}
json.Add("expire_time", now.AddSeconds(7000)); // 距离获取时间7000秒后过期
await Database.StringSetAsync(key, json.ToJson());
return(json["access_token"].Value <string>());
}
