OpenTween.TweenMain.MyList_RetrieveVirtualItem C# (CSharp) Method

        private void MyList_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
        {
            var listCache = this._listItemCache;
            if (listCache?.TargetList == sender)
            {
                ListViewItem item;
                PostClass cacheItemPost;
                if (listCache.TryGetValue(e.ItemIndex, out item, out cacheItemPost))
                {
                    e.Item = item;
                    return;
                }
            }

            // A cache miss, so create a new ListViewItem and pass it back.
            TabPage tb = (TabPage)((DetailsListView)sender).Parent;
            try
            {
                e.Item = this.CreateItem(tb, _statuses.Tabs[tb.Text][e.ItemIndex], e.ItemIndex);
            }
            catch (Exception)
            {
                // 不正な要求に対する間に合わせの応答
                string[] sitem = {"", "", "", "", "", "", "", ""};
                e.Item = new ImageListViewItem(sitem);
            }
        }