ListView虚拟模式加载数据 提高加载速度

ListView listView1 = new System.Windows.Forms.ListView();listView1.View = System.Windows.Forms.View.Details;listView1.RetrieveVirtualItem += new RetrieveVirtualItemEventHandler(listView1_RetrieveVirtualItem);List<string> list1 = new List<string>();List<string> list2 = new List<string>();listView1.VirtualListSize = _itemCount;private void listView1_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e){    e.Item = new ListViewItem(list1[e.ItemIndex], 0);    e.Item.SubItems.Add(list2[e.ItemIndex]);}