C# ListView 虚拟化加载百万数据

private void Form1_Load(object sender, EventArgs e)
        {
            listView1.View = View.Details;
            listView1.Columns.Add("索引", 100, HorizontalAlignment.Left);
            listView1.Columns.Add("对象", 100, HorizontalAlignment.Left);
            listView1.Columns.Add("通过", 100, HorizontalAlignment.Left);
            listViewItems = GetListViewItems();
            LoadListViewItems();
        }

        protected List<ListViewItem> listViewItems
        {
            get;
            private set;
        }

        private List<ListViewItem> GetListViewItems()
        {
            List<ListViewItem> items = new List<ListViewItem>();
            ListViewItem item = null;
            for (int i = 0; i < 1000000; i++)
            {
                item = new ListViewItem();
                item.SubItems[0].Text = i.ToString();
                item.SubItems.Add("编号" + i);
                item.SubItems.Add("true");
                items.Add(item);
            }
            return items;
        }

        private void LoadListViewItems()
        {
            listView1.VirtualListSize = this.listViewItems.Count;
            listView1.VirtualMode = true;
            listView1.RetrieveVirtualItem += new RetrieveVirtualItemEventHandler(listView_RetrieveVirtualItem);
        }

        void listView_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
        {
            e.Item = this.listViewItems[e.ItemIndex];
            if (e.ItemIndex == this.listViewItems.Count)
            {
                this.listViewItems = null;  //加载完成后清空listViewItems
            }
        }