/// <summary>
/// 获得令牌
/// </summary>
/// <param name="AppId"></param>
/// <param name="AppSecret"></param>
/// <returns></returns>
public string GetAccess_Token(string AppId = null, string AppSecret = null)
{
string cacheKey = "access_token";
string result;
/*如果未输入则使用系统默认配置的帐户*/
if (string.IsNullOrEmpty(AppId) || string.IsNullOrEmpty(AppSecret))
{
AppId = config.AppId;
AppSecret = config.AppSecret;
}
//如果缓存中没有access_token 则向微信发请求获取
if (!_memoryCache.TryGetValue(cacheKey, out result))
{
//判断是否需要向微信发起请求
var file_result = GetAccess_TokenByJsonFile();
if (string.IsNullOrEmpty(file_result.Item1))
{
string url = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", AppId, AppSecret);
HttpClient httpClient = new HttpClient();
var t = httpClient.GetStringAsync(url);
t.Wait();
result = t.Result;
//解析json
Hashtable ht = JsonConvert.DeserializeObject <Hashtable>(result);
string acctoken = ht["access_token"].ToString();
//写入缓存
_memoryCache.Set(cacheKey, acctoken, new MemoryCacheEntryOptions().SetAbsoluteExpiration(TimeSpan.FromSeconds(7000)));
//写入json文件
WechatModel model = new WechatModel();
model.access_token = acctoken;
model.ExportTime = 7000;
model.createtime = DateTime.Now;
model.AppId = AppId;
model.AppSecret = AppSecret;
//生成json
string writejson = JsonConvert.SerializeObject(model);
//写入json文件
WriteFile(writejson);
return(acctoken);
}
else
{
//将文件中的令牌设置到缓存中
_memoryCache.Set(cacheKey, file_result.Item1, new MemoryCacheEntryOptions().SetAbsoluteExpiration(TimeSpan.FromSeconds(file_result.Item2)));
//返回文件中的令牌
return(file_result.Item1);
}
}
else
{
//从缓存中获取access_token
return(_memoryCache.Get <string>("access_token"));
}
}
/// <summary>
/// 注入配置信息,这里本来想通过DI或者什么方法来 解除注入 还没找到方法
/// </summary>
/// <param name="option"></param>
public WechatHelper(IOptions <WechatModel> option)
{
config = option.Value;
}
