OpenTween.TweenMain.doStatusDelete C# (CSharp) Method

        private async Task doStatusDelete()
        {
            if (this._curTab == null || this._curList == null)
                return;

            if (this._curList.SelectedIndices.Count == 0)
                return;

            var posts = this._curList.SelectedIndices.Cast<int>()
                .Select(x => this.GetCurTabPost(x))
                .ToArray();

            // 選択されたツイートの中に削除可能なものが一つでもあるか
            if (!posts.Any(x => x.CanDeleteBy(this.tw.UserId)))
                return;

            var ret = MessageBox.Show(this,
                string.Format(Properties.Resources.DeleteStripMenuItem_ClickText1, Environment.NewLine),
                Properties.Resources.DeleteStripMenuItem_ClickText2,
                MessageBoxButtons.OKCancel, MessageBoxIcon.Question);

            if (ret != DialogResult.OK)
                return;

            var focusedIndex = this._curList.FocusedItem?.Index ?? this._curList.TopItem?.Index ?? 0;

            using (ControlTransaction.Cursor(this, Cursors.WaitCursor))
            {
                Exception lastException = null;
                foreach (var post in posts)
                {
                    if (!post.CanDeleteBy(this.tw.UserId))
                        continue;

                    try
                    {
                        if (post.IsDm)
                        {
                            await this.twitterApi.DirectMessagesDestroy(post.StatusId)
                                .IgnoreResponse();
                        }
                        else
                        {
                            if (post.RetweetedByUserId == this.tw.UserId)
                            {
                                // 自分が RT したツイート (自分が RT した自分のツイートも含む)
                                //   => RT を取り消し
                                await this.twitterApi.StatusesDestroy(post.StatusId)
                                    .IgnoreResponse();
                            }
                            else
                            {
                                if (post.UserId == this.tw.UserId)
                                {
                                    if (post.RetweetedId != null)
                                        // 他人に RT された自分のツイート
                                        //   => RT 元の自分のツイートを削除
                                        await this.twitterApi.StatusesDestroy(post.RetweetedId.Value)
                                            .IgnoreResponse();
                                    else
                                        // 自分のツイート
                                        //   => ツイートを削除
                                        await this.twitterApi.StatusesDestroy(post.StatusId)
                                            .IgnoreResponse();
                                }
                            }
                        }
                    }
                    catch (WebApiException ex)
                    {
                        lastException = ex;
                        continue;
                    }

                    this._statuses.RemovePostFromAllTabs(post.StatusId, setIsDeleted: true);
                }

                if (lastException == null)
                    this.StatusLabel.Text = Properties.Resources.DeleteStripMenuItem_ClickText4; // 成功
                else
                    this.StatusLabel.Text = Properties.Resources.DeleteStripMenuItem_ClickText3; // 失敗

                this.PurgeListViewItemCache();
                this._curPost = null;
                this._curItemIndex = -1;

                foreach (var tabPage in this.ListTab.TabPages.Cast<TabPage>())
                {
                    var listView = (DetailsListView)tabPage.Tag;
                    var tab = this._statuses.Tabs[tabPage.Text];

                    using (ControlTransaction.Update(listView))
                    {
                        listView.VirtualListSize = tab.AllCount;

                        if (tabPage == this._curTab)
                        {
                            listView.SelectedIndices.Clear();

                            if (tab.AllCount != 0)
                            {
                                int selectedIndex;
                                if (tab.AllCount - 1 > focusedIndex && focusedIndex > -1)
                                    selectedIndex = focusedIndex;
                                else
                                    selectedIndex = tab.AllCount - 1;

                                listView.SelectedIndices.Add(selectedIndex);
                                listView.EnsureVisible(selectedIndex);
                                listView.FocusedItem = listView.Items[selectedIndex];
                            }
                        }
                    }

                    if (this._cfgCommon.TabIconDisp && tab.UnreadCount == 0)
                    {
                        if (tabPage.ImageIndex == 0)
                            tabPage.ImageIndex = -1; // タブアイコン
                    }
                }

                if (!this._cfgCommon.TabIconDisp)
                    this.ListTab.Refresh();
            }
        }