public async Task <string> GetAccessToken()
{
if (token == null || token.IsExpired())
{
lock (locker)
{
if (token != null && !token.IsExpired())
{
return(token.access_token);
}
Dictionary <String, string> dic = new Dictionary <string, string>()
{
{ "grant_type", "client_credentials" },
{ "client_id", clientId },
{ "client_secret", clientSecret }
};
BearerToken bt = restClient.SubmitForm <BearerToken>(_url, dic).Result;
if (bt != null && !String.IsNullOrEmpty(bt.access_token))
{
bt.LastGetTime = DateTime.UtcNow;
//Logger.Info("获取Access Token:{0}\r\n{1}", clientId, bt.access_token);
}
token = bt;
}
}
return(token?.access_token);
}