using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public class SampleItem : ListViewItem
        {
            private int col1, col2, col3;

            public int Col1 { get { return col1; } }
            public int Col2 { get { return col2; } }
            public int Col3 { get { return col3; } }

            public SampleItem(int col1, int col2, int col3)
            {
                this.col1 = col1;
                this.col2 = col2;
                this.col3 = col3;

                base.Text = col1.ToString();
                base.SubItems.Add(col2.ToString());
                base.SubItems.Add(col3.ToString());
            }
        }

        public class SampleSorter : IComparer<SampleItem>
        {
            private int column = 0;
            public SampleSorter(int column)
            {
                Column = column;
            }

            public int Column
            {
                get { return column; }
                set
                {
                    if (column < 0 || column > 2)
                    {
                        throw new ArgumentOutOfRangeException();
                    }
                    column = value;
                }
            }

            public int Compare(SampleItem x, SampleItem y)
            {
                if (x != null && y != null)
                {
                    switch (Column)
                    {
                        case 0:
                            return x.Col1.CompareTo(y.Col1);
                        case 1:
                            return x.Col2.CompareTo(y.Col2);
                        case 2:
                            return x.Col3.CompareTo(y.Col3);
                    }
                }
                return 0;
            }
        }

        List<SampleItem> list;
        void Form1_Load(object sender, EventArgs e)
        {
            listView1.Columns.Clear();
            listView1.Columns.Add("Col1").TextAlign = HorizontalAlignment.Right;
            listView1.Columns.Add("Col2").TextAlign = HorizontalAlignment.Right;
            listView1.Columns.Add("Col3").TextAlign = HorizontalAlignment.Right;
            listView1.VirtualMode = false;
            listView1.Items.Clear();
            listView1.View = View.Details;
            listView1.FullRowSelect = true;

            // 10万件のサンプルデータを作成しておく
            list = new List<SampleItem>();
            Random rnd = new Random();
            for (int i = 1; i <= 100000; i++)
            {
                list.Add(new SampleItem(
                    rnd.Next(999999),
                    rnd.Next(999999),
                    rnd.Next(999999)));
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("仮想ListViewに表示");
            listView1.VirtualListSize = list.Count;
            listView1.VirtualMode = true;
        }

        private void listView1_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
        {
            if (0 <= e.ItemIndex && e.ItemIndex < list.Count)
            {
                System.Diagnostics.Trace.WriteLine(e.ItemIndex);
                e.Item = list[e.ItemIndex];
            }
        }

        private void listView1_ColumnClick(object sender, ColumnClickEventArgs e)
        {
            MessageBox.Show(String.Format("ソート列:{0}", e.Column));
            list.Sort(new SampleSorter(e.Column));
            int start = listView1.TopItem.Index;
            listView1.RedrawItems(start, start + 30, true);
            MessageBox.Show("ソート完了");
        }
    }
}