/// <summary>
        /// Initial Data from Database and sth. else
        /// </summary>
        public UserVerifyListViewModel()
        {
            if (IsInDesignMode)
            {
                return;
            }
            var lists = new VerifingFriend().GetVerifingsList();//读取数据库

            for (int i = 0; i < lists.Count; i++)
            {
                VerifyUserList.Add(lists[i]);
            }
            InitialMessanger();
        }
 /// <summary>
 /// 添加或更新集合
 /// </summary>
 /// <param name="item">对应的项</param>
 public void AddOrUpdateToList(VerifingFriend item)
 {
     #region 修改集合
     if (VerifyUserList.Count(v => v.toUserId == item.toUserId) > 0)
     {
         App.Current.Dispatcher.Invoke(() =>
         {
             var verifyItem          = VerifyUserList.FirstOrDefault(v => v.toUserId == item.toUserId);
             verifyItem.StatusTag    = item.StatusTag;
             verifyItem.VerifyStatus = item.VerifyStatus;
         });
     }
     else//添加未存在的消息
     {
         App.Current.Dispatcher.Invoke(() =>
         {
             VerifyUserList.Add(item);
         });
     }
     #endregion
 }