winform listview 虚拟模式

1、加载数据、排序、删除、更新、获取选中的值

重新加载llistview时，如果listviewitem的count变化了，必须重新设置 listView1.VirtualListSize，然后   listView1.Invalidate()刷新。

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApp32
{
    public partial class Form6 : Form
    {
        private List<ListViewItem> m_hListViewItems = null;//设置缓存容器
        private MMySorter mySort = null;//排序方式
        public Form6()
        {
            InitializeComponent();
            m_hListViewItems = new List<ListViewItem>();
            mySort = new MMySorter();
            #region listview的数据和样式
            ColumnHeader c1 = new ColumnHeader() { Text = "id" };
            ColumnHeader c2 = new ColumnHeader() { Text = "name" };
            ColumnHeader c3 = new ColumnHeader() { Text = "bir", Width = 200 };
            listView1.Columns.AddRange(new ColumnHeader[] { c1, c2, c3 });
            for (int i = 0; i < 20000; i++)
            {
                ListViewItem li = new ListViewItem() { Text = i.ToString() };
                li.SubItems.Add("name" + i);
                li.SubItems.Add(DateTime.Now.AddDays(i * 1.00).ToString("yyyy-MM-dd hh:mm:ss"));
                m_hListViewItems.Add(li);
            }
            listView1.GridLines = true;
            listView1.FullRowSelect = true;
            listView1.Cursor = Cursors.Hand;
            #endregion
            #region listview设置虚拟模式
            listView1.VirtualMode = true;
            listView1.VirtualListSize = m_hListViewItems.Count;
            listView1.RetrieveVirtualItem += ListView1_RetrieveVirtualItem;
            #endregion
            listView1.ColumnClick += ListView1_ColumnClick;
            listView1.SelectedIndexChanged += ListView1_SelectedIndexChanged;
            listView1.VirtualItemsSelectionRangeChanged += ListView1_VirtualItemsSelectionRangeChanged;
        }

        private void ListView1_VirtualItemsSelectionRangeChanged(object sender, ListViewVirtualItemsSelectionRangeChangedEventArgs e)
        {
            if (e.IsSelected)//连续选中的数量
                this.Text = (e.EndIndex -e.StartIndex+1).ToString();
        }
        private void ListView1_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.Text = listView1.SelectedIndices.Count.ToString();
        }
        private void ListView1_ColumnClick(object sender, ColumnClickEventArgs e)
        {
            if (e.Column == mySort.columnToSort)
            {
                mySort.so = mySort.so == SortOrder.Ascending ? SortOrder.Descending : SortOrder.Ascending;
            }
            else
            {
                mySort.so = SortOrder.Ascending;
                mySort.columnToSort = e.Column;
            }
            m_hListViewItems.Sort(mySort);//指定排序方法
            listView1.Invalidate();
        }

        private void ListView1_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
        {
            if (m_hListViewItems == null || m_hListViewItems.Count == 0)
                return;
            e.Item = m_hListViewItems[e.ItemIndex];
            if (e.ItemIndex == m_hListViewItems.Count)
                m_hListViewItems = null;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            #region 添加数据
            List<ListViewItem> ll = new List<ListViewItem>();
            for (int i = 20000; i < 30000; i++)
            {
                ListViewItem li = new ListViewItem() { Text = i.ToString() };
                li.SubItems.Add("name" + i);
                li.SubItems.Add(DateTime.Now.AddDays(i * 1.00).ToString("yyyy-MM-dd hh:mm:ss"));
                ll.Add(li);
            }
            m_hListViewItems.AddRange(ll);
            listView1.VirtualListSize = m_hListViewItems.Count;
            #endregion

        }
        private void button2_Click(object sender, EventArgs e)
        {
            #region 更新数据
            for (int i = 0; i < m_hListViewItems.Count; i++)
            {
                m_hListViewItems[i].SubItems[1].Text = m_hListViewItems[i].SubItems[1].Text + DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss");
            }
            listView1.Invalidate();
            #endregion
        }
        private void button3_Click(object sender, EventArgs e)
        {
            #region 删除数据
            int deleStart = 0;
            int deleEnd = 100;
            m_hListViewItems.RemoveRange(deleStart, deleEnd - deleStart);
            listView1.VirtualListSize = m_hListViewItems.Count;
            listView1.Invalidate();
            #endregion
        }

        private void button4_Click(object sender, EventArgs e)
        {
            #region 获得所选行的数据值
            StringBuilder sb = new StringBuilder();
            foreach (int i in listView1.SelectedIndices)
            {
                sb.AppendLine(listView1.Items[i].SubItems[0].Text);
            }
            MessageBox.Show(sb.ToString());
            #endregion
        }
    }
}

   class MMySorter : IComparer<ListViewItem>//此处必须是IComparer<ListViewItem>接口，不能是IComparer接口，否则报错。
    {
        public int columnToSort { get; set; }
        public SortOrder so { get; set; }
        private CaseInsensitiveComparer cic;
        public MMySorter()
        {
            columnToSort = 0;
            so = SortOrder.None;
            cic = new CaseInsensitiveComparer();
        }
        int IComparer<ListViewItem>.Compare(ListViewItem x, ListViewItem y)
        {
            int result = 0;
            ListViewItem lx = x;
            ListViewItem ly = y;
            string xtext = lx.SubItems[columnToSort].Text;
            string ytext = ly.SubItems[columnToSort].Text;
            int xx = 0, yy = 0;
            if (int.TryParse(xtext, out xx) && int.TryParse(ytext, out yy))
                result = xx.CompareTo(yy);
            else
                result = xtext.CompareTo(ytext);
            if (so == SortOrder.Ascending)
                return result;
            else if (so == SortOrder.Descending)
                return -result;
            else
                return result;
        }
    }

2.checkBox