OpenTween.FilterDialog.ButtonDelete_Click C# (CSharp) Method

        private void ButtonDelete_Click(object sender, EventArgs e)
        {
            var selectedCount = ListFilters.SelectedIndices.Count;
            if (selectedCount == 0) return;

            string tmp;

            if (selectedCount == 1)
            {
                tmp = string.Format(Properties.Resources.ButtonDelete_ClickText1, Environment.NewLine, ListFilters.SelectedItem);
            }
            else
            {
                tmp = string.Format(Properties.Resources.ButtonDelete_ClickText3, selectedCount);
            }

            var rslt = MessageBox.Show(tmp, Properties.Resources.ButtonDelete_ClickText2, MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
            if (rslt == DialogResult.Cancel) return;

            var indices = ListFilters.SelectedIndices.Cast<int>().Reverse().ToArray();  // 後ろの要素から削除
            var tab = (FilterTabModel)_sts.Tabs[ListTabs.SelectedItem.ToString()];

            using (ControlTransaction.Update(ListFilters))
            {
                foreach (var idx in indices)
                {
                    tab.RemoveFilter((PostFilterRule)ListFilters.Items[idx]);
                    ListFilters.Items.RemoveAt(idx);
                }
            }
        }