/// <summary>
 /// 适用于只有一个appid的情况
 /// </summary>
 /// <param name="cacheManager"></param>
 /// <param name="option"></param>
 public WeChatAccessTokenManager(AccessTokenCacheManager cacheManager, WeChatAccessOption option) : this(cacheManager)
 {
     if (option != null)
     {
         SetOption(option);
     }
 }
 /// <summary>
 ///
 /// </summary>
 /// <param name="cacheManager"></param>
 public WeChatAccessTokenManager(AccessTokenCacheManager cacheManager)
 {
     this.cacheManager = cacheManager;
     this.cacheManager.TokenEvictioned += CacheManager_TokenEvictioned;
 }