c# 其他信息: 已添加了具有相同键的项。 求帮忙

Question

  public JObject WxInit()
        {
            string init_json = "{{\"BaseRequest\":{{\"Uin\":\"{0}\",\"Sid\":\"{1}\",\"Skey\":\"\",\"DeviceID\":\"e1615250492\"}}}}";
            Cookie sid = BaseService.GetCookie("wxsid");
            Cookie uin = BaseService.GetCookie("wxuin");

            if (sid != null && uin != null)
            {
                init_json = string.Format(init_json, uin.Value, sid.Value);
                byte[] bytes = BaseService.SendPostRequest(_init_url + "&pass_ticket=" + LoginService.Pass_Ticket, init_json);
                string init_str = Encoding.UTF8.GetString(bytes);

                JObject init_result = JsonConvert.DeserializeObject(init_str) as JObject;

                foreach (JObject synckey in init_result["SyncKey"]["List"])  //同步键值
                {                   
                    _syncKey.Add(synckey["Key"].ToString(), synckey["Val"].ToString()); //已添加了具有相同键的项 求帮忙下，我是在winform想实现
                }
                return init_result;
            }
            else
            {
                return null;
            }
        }
        /// <summary>
        /// 获取好友头像
        /// </summary>
        /// <param name="username"></param>
        /// <returns></returns>
        public Image GetIcon(string username)
        {
            byte[] bytes = BaseService.SendGetRequest(_geticon_url + username);

           return Image.FromStream(new MemoryStream(bytes));
        }
        /// <summary>
        /// 获取微信讨论组头像
        /// </summary>
        /// <param name="usename"></param>
        /// <returns></returns>
        public Image GetHeadImg(string usename)
        {
            byte[] bytes = BaseService.SendGetRequest(_getheadimg_url + usename);

            return Image.FromStream(new MemoryStream(bytes));
        }

Answer 1

_syncKey是字典对象吗？

_syncKey.Add(synckey["Key"].ToString(), synckey["Val"].ToString());
改成

_syncKey[synckey["Key"].ToString()] = synckey["Val"].ToString();
这样改动的话，后面获取到的信息会覆盖掉之前的信息