async void GetData(int count) { var data = await _ds.GetUserMessageData(_userId, count); if (data.Total == 0) { TipText = "你们之间还没有开始。。。"; } else { TipText = string.Empty; ListData = data.ListData; if (count == -1) { IsShowLoadMoreButton = Visibility.Collapsed; } else { IsShowLoadMoreButton = data.Total > count ? Visibility.Visible : Visibility.Collapsed; } } IsProgressRingActive = false; }