public async void LoadAllComments()
        {
            try
            {
                pageIndex = 0;
                var re = await GetComments(pageIndex, pageSize, Moment.ID);

                MomentComments.Clear();
                foreach (var item in re)
                {
                    MomentComments.Add(item);
                }
            }
            catch (Exception e)
            {
#if DEBUG
                Services.NotityService.DisplayAlert("Error", e.Message, "OK");
#else
                Services.NotityService.Notify("获取数据遇到错误");
#endif
            }
            finally
            {
            }
        }
        public async void Refresh()
        {
            try
            {
                IsRefreshing = true;

                pageIndex = 0;
                var re = await GetComments(pageIndex, pageSize, Moment.ID);

                if (re == null || re.Length == 0)
                {
                    this.CanLoadMore = false;
                }
                else
                {
                    MomentComments.Clear();

                    foreach (var item in re)
                    {
                        MomentComments.Add(item);
                    }
                }
            }
            catch (Exception e)
            {
#if DEBUG
                Services.NotityService.DisplayAlert("Error", e.Message, "OK");
#else
                Services.NotityService.Notify("获取数据遇到错误");
#endif
            }
            finally
            {
                IsRefreshing = false;
            }
        }